Emissions for Modeling Scenarios for EPA's BART Proposal for Navajo Generating Station EPA, May 2012

Note that the numbering for the control scenarios is different from that used in the 2009 ANPRM.

Code Name Description Short Desc.

N0 Baseline 2001 - 2003 baseline Baseline

N1 Control Option 1 LNB + SOFA on Units 1 - 3, 0.24 lb/MMBtu LNB

N2 Control Option 2 SCR+LNB+SOFA on Units 1 - 3 (0.05 lb/MMBtu), SO2 conversion 0.67% SCR 0.05 lb/MMBtu

N3 Control Option 3 SCR+LNB+SOFA on Units 1 - 3 (0.08 lb/MMBtu), SO2 conversion 0.5% SCR 0.08, SO3 0.5%

N4 Control Option 4 SCR+LNB+SOFA on Units 1 - 3 (0.05 lb/MMBtu); SRP's Air Preheater penetration = 0.9 SCR, APH p=0.9

N5 Control Option 5 SCR+LNB+SOFA on Unit 1 only (0.05 lb/MMBtu); LNB+SOFA on Unit 2 & 3 SCR on 1, LNB on 2&3

N6 Control Option 6 SCR+LNB+SOFA on Units 1 & 3 (0.05 lb/MMBtu); LNB+SOFA on Unit 2 SCR on 1&3, LNB on 2

N7 Control Option 7 SCR as in N2, but with SCR placed *after* the ESP, as in SRP assumption SCR after ESP

N8 Control Option 8 SNCR+LNB+SOFA on Units 1 - 3, NOx at 0.18 lb/MMBtu SNCR 0.18 lb/MMBtu

N9 Control Option 9 SNCR+LNB+SOFA on Units 1 - 3, NOx at 0.15 lb/MMBtu SNCR 0.15 lb/MMBtu

The last spreadsheet tab, "Baseline stack data", has stack parameters
Abbreviat

ion Sheet/Tab name

NOx, 

lb/hr

Emission 

rank

Base n0 Base 12661 1

LNB n1 LNB 6570 2

SCR n2 SCR 1369 8

SCRhi n3 SCRhi 2190 7

SCRp9 n4 SCRp9 1369 9

SCRu1 n5 SCRu1 4899 4

SCRu13 n6 SCRu13 3159 6

SCRpost n7 SCR postESP 1369 10

SNCRhi n8 SNCR 0.18 4928 3

SNCRlo n9 SNCR 0.15 4106 5
EPA revisions to values used in ANPRM

fine total fine soil EC

MMBtu/day MMBtu/hr % ton/day lb/hr lb/MMBtu % reduction ton/day lb/hr lb/MMBtu lb/MMBtu(e) lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr

Navajo 1

750 MW, PC, 

biituminous coal, dry 

bottom, tangential 

fired, hot side ESP, 

wet FGD

211,074 8,795 0.593 5.85 487.75 0.055 #N/A 51.26 4,271.42 0.486 0.0260 228.66 153.20 (f) 86.89 (f) 66.31 (f) 63.9 (g) 2.45 (g) 37.55 (h) 2.37 (i) 2.32 35.18 (j) 190.76

Navajo 2

750 MW, PC, 

biituminous coal, dry 

bottom, tangential 

fired, hot side ESP, 

wet FGD

226,163 9,423 0.593 6.32 526.92 0.056 #N/A 50.49 4,207.50 0.446 0.0210 197.89 132.59 (f) 75.20 (f) 57.39 (f) 55.3 (g) 2.12 (g) 40.24 (h) 2.54 (i) 2.49 37.69 (j) 172.82

Navajo 3

750 MW, PC, 

biituminous coal, dry 

bottom, tangential 

fired, hot side ESP, 

wet FGD

219,778 9,157 0.593 6.91 576.17 0.063 #N/A 50.18 4,181.67 0.457 0.0310 283.88 190.20 (f) 107.87 (f) 82.33 (f) 79.3 (g) 3.05 (g) 39.10 (h) 2.47 (i) 2.42 36.63 (j) 229.30

** Below are the Original footnotes from AECOM - EPA revisions to the footnotes/emission inputs are explained separately

(a) Maximum daily 24 hour actual heat input based on Part 75 monitoring data for the 2001 - 2003 period. Unit 1 based on 12/09/03, Unit 2 based on 11/13/02, and Unit 3 based on 01/31/02.

Total PM10

total coarse H2SO4 SO4

Maximum 

Sulfur 

Content (b)

Facility Unit

Maximum NOx Emissions (d)

Maximum Emissions Including Speciated PM10 Emissions 

Filterable PM10 Condensable PM10

Fine

Maximum Filterable

PM Emissions

Description

Navajo Units 1, 2, and 3

Baseline Conditions

Maximum SO2 Emissions (c)

organic

(j) Organic condensible PM10 is 0.20 x 0.02 lb/MMBtu = 0.004 lb/MMBtu with FGD based on AP-42, Table 1.1-5, September 1998. 

(i) H2SO4 emissions are based on "Estimating Total Sulfuric Acid Emissions from Stationary Power Plants", Electric Power Research Institute, Technical Update, March, 2008 and Hardman et al., 1998. Oxidation of fuel S is 0.111% during combustion (based on EPRI). Coal sulfur content is 0.593% and the 

heating value is 10,496 Btu/lb. H2SO4 control efficiency is 37% for a hot side ESP, 10% for an air preheater, and 53% for wet FGD. 100% of the flue gas is controlled by wet FGD. Therefore, H2SO4 emissions are determined by: 0.00111 x 0.593%/100 x 1/10,496 x 1,000,000 x Heat Input x 98.06/32.07 x 0.63 x 

0.9 x 0.47. EPRI (2008) Eqn 4-2b indicates that 95% of fuel sulfur is converted to SO2.

Maximum Heat Input (a)

(f) For a dry bottom boiler with an ESP, 67% of filterable PM is PM10 and 29% is fine PM10 (PM2.5) based on AP-42, Table 1.1-6, September 1998.

(e) Maximum of 6 stack test results for the 2001 to 2006 period.

(h) Total condensible PM10 is the sum of H2SO4 and organic condensible PM10 emissions. 

(g) Elemental carbon is 3.7% of fine PM based on the best estimate for electric utility coal combustion in Table 6 of “Catalog of Global Emissions Inventories and Emission Inventory Tools for Black Carbon”, William Battye and Kathy Boyer, EPA Contract No. 68-D-98-046, January 2002.

(b) Maximum fuel sulfur content is based on daily data for the 2001 to 2003 period. Maximum sulfur content is 0.593% with a heating value of 10,496 Btu/lb based on 01/08/03.

total

(d) Maximum daily 24 hour actual emissions based on Part 75 monitoring data for the 2001 - 2003 period. Unit 1 based on 04/15/01, Unit 2 based on 03/12/01, and Unit 3 based on 03/26/01.

(c) Maximum daily 24 hour actual emissions based on Part 75 monitoring data for the 2001 - 2003 period. Unit 1 based on 05/19/03, Unit 2 based on 05/07/03, and Unit 3 based on 03/31/03. An average of 9 days/unit over the 3 year period were excluded because emissions reflected startup, shutdown or 

09000064811c2027 n0 Base 1/17/2013
EPA revisions to values used in ANPRM

fine total fine soil EC

MMBtu/day MMBtu/hr % ton/day lb/hr lb/MMBtu % reduction ton/day lb/hr lb/MMBtu lb/MMBtu(e) lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr

Navajo 1

750 MW, PC, 

bituminous coal, dry 

bottom, tangential 

fired, LNB, SOFA, hot 

side ESP, wet FGD

211,074 8,795 0.593 5.85 487.75 0.055 51% 25.33 2,110.74 0.240 0.0260 228.66 153.20 (f) 86.89 (f) 66.31 (f) 63.9 (g) 2.45 (g) 37.55 (h) 2.37 (i) 2.32 35.18 (j) 190.76

Navajo 2

750 MW, PC, 

bituminous coal, dry 

bottom, tangential 

fired, LNB, SOFA, hot 

side ESP, wet FGD

226,163 9,423 0.593 6.32 526.92 0.056 46% 27.14 2,261.63 0.240 0.0210 197.89 132.59 (f) 75.20 (f) 57.39 (f) 55.3 (g) 2.12 (g) 40.24 (h) 2.54 (i) 2.49 37.69 (j) 172.82

Navajo 3

750 MW, PC, 

bituminous coal, dry 

bottom, tangential 

fired, LNB, SOFA, hot 

side ESP, wet FGD

219,778 9,157 0.593 6.91 576.17 0.063 47% 26.37 2,197.78 0.240 0.0310 283.88 190.20 (f) 107.87 (f) 82.33 (f) 79.3 (g) 3.05 (g) 39.10 (h) 2.47 (i) 2.42 36.63 (j) 229.30

(a) Maximum daily 24 hour actual heat input based on Part 75 monitoring data for the 2001 - 2003 period. Unit 1 based on 12/09/03, Unit 2 based on 11/13/02, and Unit 3 based on 01/31/02.

(d) Maximum daily/24 hour actual emissions based on Part 75 monitoring data for the 2001 - 2003 period. Unit 1 based on 04/15/01, Unit 2 based on 03/12/01, and Unit 3 based on 03/26/01.

(c) Maximum daily 24 hour actual emissions based on Part 75 monitoring data for the 2001 - 2003 period. Unit 1 based on 05/19/03, Unit 2 based on 05/07/03, and Unit 3 based on 03/31/03. An average of 9 days/unit over the 3 year period were excluded because emissions reflected startup, shutdown or 

malfunction.

(e) Maximum of 6 stack test results for the 2001 to 2006 period.

(h) Total condensable PM10 is the sum of H2SO4 and organic condensible PM10 emissions. 

(g) Elemental carbon is 3.7% of fine PM based on the best estimate for electric utility coal combustion in Table 6 of “Catalog of Global Emissions Inventories and Emission Inventory Tools for Black Carbon”, William Battye and Kathy Boyer, EPA Contract No. 68-D-98-046, January 2002.

(f) For a dry bottom boiler with an ESP, 67% of filterable PM is PM10 and 29% is fine PM10 (PM2.5) based on AP-42, Table 1.1-6, September 1998.

total

Maximum Heat Input (a)

(j) Organic condensable PM10 is 0.20 x 0.02 lb/MMBtu = 0.004 lb/MMBtu with FGD based on AP-42, Table 1.1-5, September 1998. 

(i) H2SO4 emissions are based on "Estimating Total Sulfuric Acid Emissions from Stationary Power Plants", Electric Power Research Institute, Technical Update, March, 2008 and Hardman et al., 1998. Oxidation of fuel S is 0.111% during combustion (based on EPRI). Coal sulfur content is 0.593% and the 

heating value is 10,496 Btu/lb. H2SO4 control efficiency is 37% for a hot side ESP, 10% for an air preheater, and 53% for wet FGD. 100% of the flue gas is controlled by wet FGD. Therefore, H2SO4 emissions are determined by: 0.00111 x 0.593%/100 x 1/10,496 x 1,000,000 x Heat Input x 98.06/32.07 x 0.63 x 

0.9 x 0.47. EPRI (2008) Eqn 4-2b indicates that 95% of fuel sulfur is converted to SO2.

** Below are the Original footnotes from AECOM - EPA revisions to the footnotes/emission inputs are explained separately

(b) Maximum fuel sulfur content is based on daily data for the 2001 to 2003 period. Maximum sulfur content is 0.593% with a heating value of 10,496 Btu/lb based on 01/08/03.

coarse SO4

Maximum Emissions Including Speciated PM10 Emissions 

Total PM10

Filterable PM10 Condensable PM10

Fine

Maximum Filterable

PM Emissions

Unit Description total

Maximum 

Sulfur 

Content (b)

Navajo Units 1, 2, and 3

Control Option 1: Low NOx Burners and Separated Overfire Air

Facility H2SO4 organic

Maximum SO2 Emissions (c) Maximum NOx Emissions (d)

09000064811c2027 n1 LNB 1/17/2013
Control Option 2: Low NOx Burners, Separated Overfire Air, and Selective Catalytic Reduction (Units 1, 2 & 3) _ EPA modified to u

EPA revisions to values used in ANPRM

MMBtu/day MMBtu/hr % ton/day lb/hr lb/MMBtu % reduction ton/day

Navajo 1

750 MW, PC, 

bituminous coal, dry

bottom, tangential 

fired, LNB, SOFA, 

SCR, hot side ESP, 

wet FGD

211,074 8,795 0.593 5.85 487.75 0.055 90% 5.28

Navajo 2

750 MW, PC, 

bituminous coal, dry

bottom, tangential 

fired, LNB, SOFA, 

SCR, hot side ESP, 

wet FGD

226,163 9,423 0.593 6.32 526.92 0.056 89% 5.65

Navajo 3

750 MW, PC, 

bituminous coal, dry

bottom, tangential 

fired, LNB, SOFA, 

SCR, hot side ESP, 

wet FGD

219,778 9,157 0.593 6.91 576.17 0.063 89% 5.49

Maximum Heat Input (a)

Maximum 

Sulfur 

Content (b)

(a) Maximum daily 24 hour actual heat input based on Part 75 monitoring data for the 2001 - 2003 period. Unit 1 based on 12/09/03, Unit 2 based on 11/13/02, and Unit 

Maximum Emissions Including Spe

Navajo Units 1, 2, 

Facility Unit Description

** Below are the Original footnotes from AECOM - EPA revisions to the footnotes/emission inputs are explained separately

(b) Maximum fuel sulfur content is based on daily data for the 2001 to 2003 period. Maximum sulfur content is 0.593% with a heating value of 10,496 Btu/lb based on 01

Maximum SO2 Emissions (c) Maximum NOx Emissions 
Unit conversion for ammonia slip from ppmvd to lb/hr

NH3 0.75 ppmvd at 6% O2 Method 19 (SO2 removal efficiency) formula, Eq. 19-1:

0.00045 lb/MMBtu E = Cd*Fd*20.9/(20.9 - %O2d)

unit 1 3.99 lb/hr Cd = Pollutant concentration, dry basis

unit 2 4.27 lb/hr Fd = volumes of combustion components per unit of heat c

unit 3 4.15 lb/hr %O2d = Concentration of oxygen on a dry basis, percent.

Table 19-2 gives F factor for bituminous coal as Fd = 9780 

(6) The 0.63 ESP penetration is applied to H2SO4 before the ammonia reaction, which mainly occurs in the lower temperatures of the air preheater.

SCR conversion of SO2 to SO3

99.50% = fraction SO2 remaining after 3 layers, corresponding to 0.5% conversion

layers conversion

1 0.17%

2 0.33%

3 0.50%

4 0.67%

(h) Total condensable PM10 is the sum of H2SO4 and organic condensable PM10 emissions. 

(c) Maximum daily 24 hour actual emissions based on Part 75 monitoring data for the 2001 - 2003 period. Unit 1 based on 05/19/03, Unit 2 based on 05/07/03, and Unit 

(2) in sulfuric acid calculation, revised penetration factor for hot-side ESP from 1 (used in ANPRM) to 0.63. 

(f) For a dry bottom boiler with an ESP, 67% of filterable PM is PM10 and 29% is fine PM10 (PM2.5) based on AP-42, Table 1.1-6, September 1998.

(g) Elemental carbon is 3.7% of fine PM based on the best estimate for electric utility coal combustion in Table 6 of “Catalog of Global Emissions Inventories and Emiss

EPA revisions to Values used in ANPRM (3-7-11)

(e) Maximum of 6 stack test results for the 2001 to 2006 period.

(i) H2SO4 emissions are based on "Estimating Total Sulfuric Acid Emissions from Stationary Power Plants", Electric Power Research Institute, Technical Update, March

the heating value is 10,496 Btu/lb. H2SO4 control efficiency is 37% for a hot side ESP, 10% for an air preheater, and 53% for wet FGD. 100% of the flue gas is controlle

98.06/32.07 x 0.63 x 0.9 x 0.47. EPRI (2008) Eqn 4-2b indicates that 95% of fuel sulfur is converted to SO2.

(1) set HCl and HF to zero

(j) Organic condensable PM10 is 0.20 x 0.02 lb/MMBtu = 0.004 lb/MMBtu with FGD based on AP-42, Table 1.1-5, September 1998. 

(d) Maximum daily/24 hour actual emissions based on Part 75 monitoring data for the 2001 - 2003 period. Unit 1 based on 04/15/01, Unit 2 based on 03/12/01, and Unit 

(5) Ammonia slip calculation only affects split between H2SO4 and ammonium sulfate/bisulfate. Since in this case there is no ammonia slip, and controls are assumed to 

assumed to be affected the same way, the SO4 for modeling can also be calculated directly from H2SO4 * 96.06/98.08.)

(3) in sulfuric acid calculation, used EPRI 2010 Technical Update value of 0.5 for penetration through air preheater for low S Eastern Bituminous coal (e.g. low alkalinity c

PRB coal (strongly alkaline coal)

(4) 0.67% SO2 to SO3 conversion efficiency : Three layers give 0.5% conversion; may not have 4th till 3rd year, but conservatively assume all in four place at start. 1 - (

(k) Ammonia slip is 0.75 ppmvd at 6% O2 for SCR.

(l) Ammonia is assumed to react with SO4 to form ammonium sulfate per EPRI 2008 if the molecules of NH3 are at least twice those of H2SO4; otherwise, ammonium b
Penetration factors H2SO4 AbS and AS PM, general

p % ctrl p % ctrl p % ctrl

hot-side ESP 0.63 37% 0.01 99% 0.01 99%

Air Preheater 0.50 50% 0.75 25%

Wet FGD (scrubber) 0.47 53% 0.50 50%

EPRI H2SO4 doc EPRI NH3 doc
 & 3) _ EPA modified to use Ultra-low activity catalyst and NOx limit 0.05 lb/MMBtu

fine total fine soil EC

lb/hr lb/MMBtu lb/MMBtu(e) lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr

439.74 0.050 0.026 228.66 153.20 (f) 86.89 (f) 66.31 (f) 63.9 (g) 2.45 (g) 51.88 (h) 16.70 (i) 35.18 (j)

471.17 0.050 0.021 197.89 132.59 (f) 75.20 (f) 57.39 (f) 55.3 (g) 2.12 (g) 55.59 (h) 17.89 (i) 37.69 (j)

457.87 0.050 0.031 283.88 190.20 (f) 107.87 (f) 82.33 (f) 79.3 (g) 3.05 (g) 54.02 (h) 17.39 (i) 36.63 (j)

total coarse

Fine

total

t 2 based on 11/13/02, and Unit 3 based on 01/31/02.

H2SO4

issions Including Speciated PM10 Emissions

Navajo Units 1, 2, and 3

Filterable PM10 Condensable PM10

organic

Maximum Filterable

PM Emissions

plained separately

lue of 10,496 Btu/lb based on 01/08/03.

aximum NOx Emissions (d)
efficiency) formula, Eq. 19-1:

Atmosphere is 20.9% oxygen

on, dry basis Ammonia M.W. is 17 lb/lb.mol

on components per unit of heat content 385 ft3/lb-mol = volume of 1 ft3 of gas at STP

oxygen on a dry basis, percent.

or bituminous coal as Fd = 9780 sdcf/10^6 Btu

ir preheater.

t 2 based on 05/07/03, and Unit 3 based on 03/31/03. An average of 9 days/unit over the 3 year period were excluded because emissions reflected startup, shutdown or malfunction

ember 1998.

missions Inventories and Emission Inventory Tools for Black Carbon”, William Battye and Kathy Boyer, EPA Contract No. 68-D-98-046, January 2002.

stitute, Technical Update, March, 2008 and Hardman et al., 1998. Oxidation of fuel S is 0.111% during combustion (based on EPRI). Coal sulfur content is 0.593% and 

100% of the flue gas is controlled by wet FGD. Therefore, H2SO4 emissions are determined by: 0.00111 x 0.593%/100 x 1/10,496 x 1,000,000 x Heat Input x 

it 2 based on 03/12/01, and Unit 3 based on 03/26/01.

slip, and controls are assumed to affect all these the same way, the split is irrelevant, and only total amount of SO4 matters for modeling. (Since all SO4 forms are 

uminous coal (e.g. low alkalinity coal), changed slightly from EPRI 2008 value EPA used in ANPRM of 0.49 and in lieu of the value of 0.36 cited in the EPRI 2010 for 

me all in four place at start. 1 - (1 - 0.005)^(3/4) or 0.005*4/3 are both about 0.0067 = 0.67%, see below

H2SO4; otherwise, ammonium bisulfate is formed. 

lb/hr lb/hr lb mole/hr lb mole/hr mole ratio lb mole/hr lb mole/hr lb mole/hr lb mole/hr lb/hr lb/hr lb/hr

71.06 3.99 (k) 0.234 0.724 0.323 0.490 0.234 0.000 0.000 0.00 17.64 16.35

76.13 4.27 (k) 0.251 0.776 0.323 0.525 0.251 0.000 0.000 0.00 18.90 17.52

73.99 4.15 (k) 0.244 0.754 0.323 0.510 0.244 0.000 0.000 0.00 18.36 17.03

[NH3] after 

reaction

H2SO4 + 

AbS + AS 

post-control

[H2SO4] 

after 

reaction

[NH3] / 

[H2SO4] 

ratio

Total 

Effective 

SO4 for 

modeling

[H2SO4]

H2SO4 

before NH3 

interaction, 

after ESP

[AS] or 

[(NH4)2SO

4] after 

reaction

NH3 Slip

[AbS] or 

[NH4HSO4] 

after 

reaction

Ammonia slip and reaction with sulfuric acid, for Net ammonia slip and Modeling SO4

Net NH3 

after 

reaction & 

WFGD

[NH3]
shutdown or malfunction.

For copying to Word version of tables

Highlight numbers portion of table here, copy; then goto Word, highlight nu

Control Option 2: SCR Units 1 - 3

H2SO4 HCl HF HCl + HF HCl+HF+

Pmfine

Max Heat 

Input SO2 NOx H2SO4

lb/hr lb/mmbtu lb/mmbtu lb/Mmbtu lb/hr new PM 

fine MMBtu/hr lb/MMBtu lb/MMBtu lb/MMBtu

206.02 0.0019 0 0 0 63.86 Unit 1 8,795 0.06 0.05 0.0019

189.178 0.0019 0 0 0 55.27 Unit 2 9,423 0.06 0.05 0.0019

245.192 0.0019 0 0 0 79.28 Unit 3 9,157 0.06 0.05 0.0019

Max Heat 

Input SO2 NOx H2SO4

Total PM10
MMBtu/hr lb/hr lb/hr lb/hr

Unit 1 8,795 487.75 439.74 16.70

Unit 2 9,423 526.92 471.17 16.70

Unit 3 9,157 576.17 457.87 16.70

1368.78

 then goto Word, highlight numbers section of its table, paste

Filterable PM10 Condensable PM10 (CPM)Filterable PM

NH3 PM coarse PM fine 

soil

PM fine 

EC

inorganic 

(SO4)

organic 

(SOA)

Max Stack 

Test

lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu

0 0.010 0.007 0.00028 0.0019 0.0040 0.026

0 0.008 0.006 0.00023 0.0019 0.0040 0.021

0 0.012 0.009 0.00033 0.0019 0.0040 0.031

Filterable PM10 Condensable PM10 (CPM) lb/hr with pollutants in order expected by CALPUFF, rounded to 

NH3 PM coarse PM fine 

soil

PM fine 

EC

inorganic 

(SO4)

organic 

(SOA)

Max Stack 

Test
lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr scen SRCNAM SO2 SO4 NOX HNO3 0 86.89 63.86 2.45 16.35 35.18 228.66 n2 NGS1 487.75 16.35 439.74 0 0 75.20 55.27 2.12 17.52 37.69 197.89 n2 NGS2 526.92 17.52 471.17 0 0 107.87 79.28 3.05 17.03 36.63 283.88 n2 NGS3 576.17 17.03 457.87 0

CALPUFF, rounded to 2 decimals
NO3 SOA PMF PMC EC 0 35.18 63.86 86.89 2.45 0 37.69 55.27 75.20 2.12 0 36.63 79.28 107.87 3.05
Control Option 3: SCR Units 1 - 3; high limit 0.08 lb/MMBtu

Filterable PM10 Condensable PM10 (CPM) Filterable PM

Max Heat 

Input SO2 NOx H2SO4 NH3 PM coarse PM fine soil

PM fine 

EC

inorganic 

(SO4)

organic 

(SOA)

Max Stack 

Test

MMBtu/hr lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu

Unit 1 8,795 0.06 0.08 0.0015 0 0.010 0.007 0.00028 0.0015 0.0040 0.026

Unit 2 9,423 0.06 0.08 0.0015 0 0.008 0.006 0.00023 0.0015 0.0040 0.021

Unit 3 9,157 0.06 0.08 0.0015 0 0.012 0.009 0.00033 0.0015 0.0040 0.031

Filterable PM10 Condensable PM10 (CPM) lb/hr with pollutants in order expec

Max Heat 

Input SO2 NOx H2SO4 NH3 PM coarse PM fine soil

PM fine 

EC

inorganic 

(SO4)

organic 

(SOA)

Max Stack 

Test

MMBtu/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr scen

Unit 1 8,795 487.75 703.58 13.06 0 86.89 63.86 2.45 12.79 35.18 228.66 n3

Unit 2 9,423 526.92 753.88 14.00 0 75.20 55.27 2.12 13.71 37.69 197.89 n3

Unit 3 9,157 576.17 732.59 13.60 0 107.87 79.28 3.05 13.32 36.63 283.88 n3
b/hr with pollutants in order expected by CALPUFF, rounded to 2 decimals

SRCNAM SO2 SO4 NOX HNO3 NO3 SOA PMF PMC EC

NGS1 487.75 12.79 703.58 0 0 35.18 63.86 86.89 2.45

NGS2 526.92 13.71 753.88 0 0 37.69 55.27 75.20 2.12

NGS3 576.17 13.32 732.59 0 0 36.63 79.28 107.87 3.05
Control Option 4: SCR Units 1 - 3; air preheater penetration 0.9

Filterable PM10 Condensable PM10 (CPM)Filterable PM

Max Heat 

Input SO2 NOx H2SO4 NH3 PM coarse PM fine soil

PM fine 

EC

inorganic 

(SO4)

organic 

(SOA)

Max Stack 

Test

MMBtu/hr lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu

Unit 1 8,795 0.06 0.05 0.0034 0 0.010 0.007 0.00028 0.0033 0.0040 0.026

Unit 2 9,423 0.06 0.05 0.0034 0 0.008 0.006 0.00023 0.0033 0.0040 0.021

Unit 3 9,157 0.06 0.05 0.0034 0 0.012 0.009 0.00033 0.0033 0.0040 0.031

Filterable PM10 Condensable PM10 (CPM)Filterable PM lb/hr with pollutants in order expected by CALPUFF, rounded to 2 decimals

Max Heat 

Input SO2 NOx H2SO4 NH3 PM coarse PM fine soil

PM fine 

EC

inorganic 

(SO4)

organic 

(SOA)

Max Stack 

Test

MMBtu/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr scen SRCNAM SO2 SO4 NOX HNO3 NO3 SOA PMF PMC EC

Unit 1 8,795 487.75 439.74 30.06 0 86.89 63.86 2.45 29.44 35.18 228.66 n4 NGS1 487.75 29.44 439.74 0 0 35.18 63.86 86.89 2.45

Unit 2 9,423 526.92 471.17 32.21 0 75.20 55.27 2.12 31.54 37.69 197.89 n4 NGS2 526.92 31.54 471.17 0 0 37.69 55.27 75.20 2.12

Unit 3 9,157 576.17 457.87 31.30 0 107.87 79.28 3.05 30.65 36.63 283.88 n4 NGS3 576.17 30.65 457.87 0 0 36.63 79.28 107.87 3.05

09000064811c2027 n4 SCRp9 1/17/2013
EPA revisions to values used in ANPRM

MMBtu/day MMBtu/hr % ton/day lb/hr

Navajo 1

750 MW, PC, 

bituminous coal, dry

bottom, tangential 

fired, LNB, SOFA, 

SCR, hot side ESP, 

wet FGD

211,074 8,795 0.593 5.85 487.75

Navajo 2

750 MW, PC, 

bituminous coal, dry

bottom, tangential 

fired, LNB, SOFA, 

hot side ESP, 

wet FGD

226,163 9,423 0.593 6.32 526.92

Navajo 3

750 MW, PC, 

bituminous coal, dry

bottom, tangential 

fired, LNB, SOFA, 

hot side ESP, 

wet FGD

219,778 9,157 0.593 6.91 576.17

Unit conversion for ammonia slip from ppmvd to lb/hr

(g) Elemental carbon is 3.7% of fine PM based on the best estimate for electric utility coal combustion in Table 6 of “Catalog of 

(h) Total condensable PM10 is the sum of H2SO4 and organic condensable PM10 emissions. 

(i) H2SO4 emissions are based on "Estimating Total Sulfuric Acid Emissions from Stationary Power Plants", Electric Power Res

the heating value is 10,496 Btu/lb. H2SO4 control efficiency is 37% for a hot side ESP, 10% for an air preheater, and 53% for w

98.06/32.07 x 0.63 x 0.9 x 0.47. EPRI (2008) Eqn 4-2b indicates that 95% of fuel sulfur is converted to SO2.

(j) Organic condensable PM10 is 0.20 x 0.02 lb/MMBtu = 0.004 lb/MMBtu with FGD based on AP-42, Table 1.1-5, September 19

(k) Ammonia slip is 0.75 ppmvd at 6% O2 for SCR.

(l) Ammonia is assumed to react with SO4 to form ammonium sulfate per EPRI 2008 if the molecules of NH3 are at least twice 

(a) Maximum daily 24 hour actual heat input based on Part 75 monitoring data for the 2001 - 2003 p

(b) Maximum fuel sulfur content is based on daily data for the 2001 to 2003 period. Maximum sulfur content is 0.593% with a he

(c) Maximum daily 24 hour actual emissions based on Part 75 monitoring data for the 2001 - 2003 period. Unit 1 based on 05/1

or malfunction.

(d) Maximum daily/24 hour actual emissions based on Part 75 monitoring data for the 2001 - 2003 period. Unit 1 based on 04/1

(e) Maximum of 6 stack test results for the 2001 to 2006 period.

(f) For a dry bottom boiler with an ESP, 67% of filterable PM is PM10 and 29% is fine PM10 (PM2.5) based on AP-42, Table 1.1

Control Option 5: Low NOx Burners, Separated Overfire Air, and Selective Ca

Facility Unit Description

Maximum Heat Input (a)

Maximum 

Sulfur 

Content (b)

Maximum SO2 Emissions 
NH3 0.75 ppmvd at 6% O2

0.00045 lb/MMBtu

unit 1 3.99 lb/hr

unit 2 4.27 lb/hr

unit 3 4.15 lb/hr

(6) The 0.63 ESP penetration is applied to H2SO4 before the ammonia reaction, which mainly occurs in the lower temperatures 

(5) Ammonia slip calculation only affects split between H2SO4 and ammonium sulfate/bisulfate. Since in this case there is no am

(4) 0.67% SO2 to SO3 conversion efficiency : Three layers give 0.5% conversion; may not have 4th till 3rd year, but conservativ

(3) in sulfuric acid calculation, used EPRI 2010 Technical Update value of 0.5 for penetration through air preheater (instead of A

0.36 cited in the EPRI 2010 for PRB coal (strongly alkaline coal)

EPA revisions to Values used in ANPRM (3-7-11)

(1) set HCl and HF to zero

(2) in sulfuric acid calculation, revised penetration factor for hot-side ESP from 1 (used in ANPRM) to 0.63. 
lb/MMBtu % reduction ton/day lb/hr lb/MMBtu lb/MMBtu(e) lb/hr lb/hr

0.055 90% 5.28 439.74 0.050 0.026 228.66 153.20 (f)

0.056 46% 27.14 2,261.63 0.240 0.021 197.89 132.59 (f)

0.063 47% 26.37 2,197.78 0.240 0.031 283.88 190.20 (f)

stion in Table 6 of “Catalog of Global Emissions Inventories and Emission Inventory Tools for Black Carbon”, William Battye and Kathy Boye

er Plants", Electric Power Research Institute, Technical Update, March, 2008 and Hardman et al., 1998. Oxidation of fuel S is 0.111% durin

n air preheater, and 53% for wet FGD. 100% of the flue gas is controlled by wet FGD. Therefore, H2SO4 emissions are determined by: 0.0

42, Table 1.1-5, September 1998. 

ules of NH3 are at least twice those of H2SO4; otherwise, ammonium bisulfate is formed. 

ata for the 2001 - 2003 period. Unit 1 based on 12/09/03, Unit 2 based on 11/13/02, and Unit 3 based on 01/31

fur content is 0.593% with a heating value of 10,496 Btu/lb based on 01/08/03.

3 period. Unit 1 based on 05/19/03, Unit 2 based on 05/07/03, and Unit 3 based on 03/31/03. An average of 9 days/unit over the 3 year perio

3 period. Unit 1 based on 04/15/01, Unit 2 based on 03/12/01, and Unit 3 based on 03/26/01.

.5) based on AP-42, Table 1.1-6, September 1998.

total

Maximum Filterable

PM Emissions

Maximum Emissions Including Speciated PM10 Emissions

Navajo Units 1, 2, and 3

re Air, and Selective Catalytic Reduction (Unit 1 only) _ EPA modified to use Ultra-low activity catalyst and N

m SO2 Emissions (c) Maximum NOx Emissions (d)
curs in the lower temperatures of the air preheater.

ince in this case there is no ammonia slip, and controls are assumed to affect all these the same way, the split is irrelevant, and only total am

th till 3rd year, but conservatively assume all in four place at start. 1 - (1 - 0.005)^(3/4) or 0.005*4/3 are both about 0.0067 = 0.67%

ugh air preheater (instead of AECOM's value of 0.9) for low S Eastern Bituminous coal (e.g. low alkalinity coal), changed slightly from EPRI 2
fine total fine soil EC

lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr

86.89 (f) 66.31 (f) 63.9 (g) 2.45 (g) 51.88 (h) 16.70 (i) 35.18 (j) 71.06

75.20 (f) 57.39 (f) 55.3 (g) 2.12 (g) 40.24 (h) 2.54 (i) 37.69 (j) 10.82

107.87 (f) 82.33 (f) 79.3 (g) 3.05 (g) 39.10 (h) 2.47 (i) 36.63 (j) 10.52

on”, William Battye and Kathy Boyer, EPA Contract No. 68-D-98-046, January 2002.

Oxidation of fuel S is 0.111% during combustion (based on EPRI). Coal sulfur content is 0.593% and 

4 emissions are determined by: 0.00111 x 0.593%/100 x 1/10,496 x 1,000,000 x Heat Input x 

, and Unit 3 based on 01/31/02.

e of 9 days/unit over the 3 year period were excluded because emissions reflected startup, shutdown 

coarse

Fine

total H2SO4 organic

Filterable PM10 Condensable PM10 H2SO4 

before NH3 

interaction, 

after ESP

a-low activity catalyst and NOx emssions of 0.05 lb/MMBtu
e split is irrelevant, and only total amount of SO4 matters for modeling.

both about 0.0067 = 0.67%

 coal), changed slightly from EPRI 2008 value EPA used in ANPRM of 0.49 and in lieu of the value of 
lb/hr lb mole/hr lb mole/hr mole ratio lb mole/hr lb mole/hr lb mole/hr lb mole/hr

3.99 (k) 0.234 0.724 0.323 0.490 0.234 0.000 0.000 

0 0 0.026 

0 0 0.025 

Ammonia slip and reaction with sulfuric acid, for Net ammonia slip and Modeling SO4

[NH3] / 

[H2SO4] 

ratio

[H2SO4] 

after 

reaction

[AbS] or 

[NH4HSO4] 

after 

reaction

[AS] or 

[(NH4)2SO

4] after 

reaction

[NH3] after 

reaction NH3 Slip [NH3] [H2SO4]

H2SO4 HCl HF HCl + HF HCl+HF+

Pmfine

lb/hr lb/hr lb/hr lb/hr lb/mmbtu lb/mmbtu lb/Mmbtu lb/hr new PM 

fine

0.00 17.64 16.35 204.74 0.0019 0 0 0 63.86

0 0.60 2.49 172.77 0.0003 0 0 0 55.27

0 0.58 2.42 229.25 0.0003 0 0 0 79.28

 Modeling SO4

Net NH3 

after 

reaction & 

WFGD

Total PM10

H2SO4 + 

AbS + AS 

post-control

Total 

Effective 

SO4 for 

modeling

For copying to Word version of tables

Highlight numbers portion of table here, copy; then in Word, highlight numbers section of its table, paste

Control Option 5: SCR Unit 1, LNB on Units 2 & 3

Filterable PM10

Max Heat 

Input SO2 NOx H2SO4 NH3 PM coarse PM fine soil

MMBtu/hr lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu

Unit 1 8,795 0.06 0.05 0.0019 0 0.010 0.007

Unit 2 9,423 0.06 0.24 0.0003 0 0.008 0.006

Unit 3 9,157 0.06 0.24 0.0003 0 0.012 0.009

Filterable PM10

Max Heat 

Input SO2 NOx H2SO4 NH3 PM coarse PM fine soil

MMBtu/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr

Unit 1 8,795 487.75 439.74 16.70 0 86.89 63.86

Unit 2 9,423 526.92 2261.63 2.54 0 75.20 55.27

Unit 3 9,157 576.17 2197.78 2.47 0 107.87 79.28

4899.15

section of its table, paste

Condensable PM10 (CPM)Filterable PM

PM fine 

EC

inorganic 

(SO4)

organic 

(SOA)

Max Stack 

Test

lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu

0.00028 0.0019 0.0040 0.026

0.00023 0.0003 0.0040 0.021

0.00033 0.0003 0.0040 0.031

Condensable PM10 (CPM)Filterable PM lb/hr with pollutants in order expected by CALPUFF, round

PM fine 

EC

inorganic 

(SO4)

organic 

(SOA)

Max Stack 

Test

lb/hr lb/hr lb/hr lb/hr scen SRCNAM SO2 SO4 NOX

2.45 16.35 35.18 228.66 n5 NGS1 487.75 16.35 439.74

2.12 2.49 37.69 197.89 n5 NGS2 526.92 2.49 2261.63

3.05 2.42 36.63 283.88 n5 NGS3 576.17 2.42 2197.78

 by CALPUFF, rounded to 2 decimals

HNO3 NO3 SOA PMF PMC EC

0 0 35.18 63.86 86.89 2.45

0 0 37.69 55.27 75.20 2.12

0 0 36.63 79.28 107.87 3.05
EPA revisions to values used in ANPRM

MMBtu/day MMBtu/hr % ton/day lb/hr

Navajo 1

750 MW, PC, 

bituminous coal, dry

bottom, tangential 

fired, LNB, SOFA, 

SCR, hot side ESP, 

wet FGD

211,074 8,795 0.593 5.85 487.75

Navajo 2

750 MW, PC, 

bituminous coal, dry

bottom, tangential 

fired, LNB, SOFA, hot 

side ESP, wet FGD

226,163 9,423 0.593 6.32 526.92

Navajo 3

750 MW, PC, 

bituminous coal, dry

bottom, tangential 

fired, LNB, SOFA, 

SCR, hot side ESP, 

wet FGD

219,778 9,157 0.593 6.91 576.17

Unit conversion for ammonia slip from ppmvd to lb/hr

NH3 0.75 ppmvd at 6% O2

Control Option 6: Low NOx Burners, Separated Overfi

(l) Ammonia is assumed to react with SO4 to form ammonium sulfate per EPRI 2008 if the molecules of NH3 are at least twice 

(f) For a dry bottom boiler with an ESP, 67% of filterable PM is PM10 and 29% is fine PM10 (PM2.5) based on AP-42, Table 1.1

(g) Elemental carbon is 3.7% of fine PM based on the best estimate for electric utility coal combustion in Table 6 of “Catalog of 

(h) Total condensable PM10 is the sum of H2SO4 and organic condensable PM10 emissions. 

(i) H2SO4 emissions are based on "Estimating Total Sulfuric Acid Emissions from Stationary Power Plants", Electric Power Res

the heating value is 10,496 Btu/lb. H2SO4 control efficiency is 37% for a hot side ESP, 10% for an air preheater, and 53% for w

98.06/32.07 x 0.63 x 0.9 x 0.47. EPRI (2008) Eqn 4-2b indicates that 95% of fuel sulfur is converted to SO2.

(j) Organic condensable PM10 is 0.20 x 0.02 lb/MMBtu = 0.004 lb/MMBtu with FGD based on AP-42, Table 1.1-5, September 19

(k) Ammonia slip is 0.75 ppmvd at 6% O2 for SCR.

** Below are the Original footnotes from AECOM - EPA revisions to the footnotes/emission inputs 

(a) Maximum daily 24 hour actual heat input based on Part 75 monitoring data for the 2001 - 2003 period. Unit 1 based on 12/0

(b) Maximum fuel sulfur content is based on daily data for the 2001 to 2003 period. Maximum sulfur content is 0.593% with a he

(c) Maximum daily 24 hour actual emissions based on Part 75 monitoring data for the 2001 - 2003 period. Unit 1 based on 05/1

(d) Maximum daily/24 hour actual emissions based on Part 75 monitoring data for the 2001 - 2003 period. Unit 1 based on 04/1

(e) Maximum of 6 stack test results for the 2001 to 2006 period.

Facility Unit Description

Maximum Heat Input (a)

Maximum 

Sulfur 

Content (b)

Maximum SO2 Emissions 
0.00045 lb/MMBtu

unit 1 3.99 lb/hr

unit 2 4.27 lb/hr

unit 3 4.15 lb/hr

(6) The 0.63 ESP penetration is applied to H2SO4 before the ammonia reaction, which mainly occurs in the lower temperatures 

SCR conversion of SO2 to SO3

99.50% = fraction SO2 remaining after 3 layers, corresponding t

layers conversion

1 0.17%

2 0.33%

3 0.50%

4 0.67%

Penetration factors H2SO4 AbS and AS PM, general

p % ctrl p % ctrl p

hot-side ESP 0.63 37% 0.01 99% 0.01

Air Preheater 0.50 50% 0.75 25%

Wet FGD (scrubber) 0.47 53% 0.50 50%

EPRI H2SO4 doc EPRI NH3 doc

(5) Ammonia slip calculation only affects split between H2SO4 and ammonium sulfate/bisulfate. Since in this case there is no am

assumed to be affected the same way, the SO4 for modeling can also be calculated directly from H2SO4 * 96.06/98.08.)

EPA revisions to Values used in ANPRM (3-7-11)

(1) set HCl and HF to zero

(2) in sulfuric acid calculation, revised penetration factor for hot-side ESP from 1 (used in ANPRM) to 0.63. 

(3) in sulfuric acid calculation, used EPRI 2010 Technical Update value of 0.5 for penetration through air preheater for low S Ea

PRB coal (strongly alkaline coal)

(4) 0.67% SO2 to SO3 conversion efficiency : Three layers give 0.5% conversion; may not have 4th till 3rd year, but conservativ
lb/MMBtu % reduction ton/day lb/hr lb/MMBtu lb/MMBtu(e) lb/hr lb/hr

0.055 90% 5.28 439.74 0.050 0.026 228.66 153.20 (f)

0.056 46% 27.14 2,261.63 0.240 0.021 197.89 132.59 (f)

0.063 89% 5.49 457.87 0.050 0.031 283.88 190.20 (f)

Method 19 (SO2 removal efficiency) formula, Eq. 19-1:

rners, Separated Overfire Air and Selective Catalytic Reduction (Units 1 & 3 only); NOx emissions of 0.05 lb/

ules of NH3 are at least twice those of H2SO4; otherwise, ammonium bisulfate is formed. 

.5) based on AP-42, Table 1.1-6, September 1998.

stion in Table 6 of “Catalog of Global Emissions Inventories and Emission Inventory Tools for Black Carbon”, William Battye and Kathy Boye

er Plants", Electric Power Research Institute, Technical Update, March, 2008 and Hardman et al., 1998. Oxidation of fuel S is 0.111% durin

n air preheater, and 53% for wet FGD. 100% of the flue gas is controlled by wet FGD. Therefore, H2SO4 emissions are determined by: 0.0

42, Table 1.1-5, September 1998. 

notes/emission inputs are explained separately

 period. Unit 1 based on 12/09/03, Unit 2 based on 11/13/02, and Unit 3 based on 01/31/02.

fur content is 0.593% with a heating value of 10,496 Btu/lb based on 01/08/03.

3 period. Unit 1 based on 05/19/03, Unit 2 based on 05/07/03, and Unit 3 based on 03/31/03. An average of 9 days/unit over the 3 year perio

3 period. Unit 1 based on 04/15/01, Unit 2 based on 03/12/01, and Unit 3 based on 03/26/01.

total

Maximum Filterable

PM Emissions

Maximum Emissions Including Speciated PM10 Emissions

Navajo Units 1, 2, and 3

m SO2 Emissions (c) Maximum NOx Emissions (d)
E = Cd*Fd*20.9/(20.9 - %O2d) Atmosphere is 20.9% oxygen

Cd = Pollutant concentration, dry basis Ammonia M.W. is 17 lb/lb.mol

Fd = volumes of combustion components per unit of heat content 385 ft3/lb-mol = volume of 1 ft3 of gas at STP

%O2d = Concentration of oxygen on a dry basis, percent.

Table 19-2 gives F factor for bituminous coal as Fd = 9780 sdcf/10^6 Btu

curs in the lower temperatures of the air preheater.

after 3 layers, corresponding to 0.5% conversion

% ctrl

99%

ince in this case there is no ammonia slip, and controls are assumed to affect all these the same way, the split is irrelevant, and only total am

H2SO4 * 96.06/98.08.)

ugh air preheater for low S Eastern Bituminous coal (e.g. low alkalinity coal), changed slightly from EPRI 2008 value EPA used in ANPRM of 

th till 3rd year, but conservatively assume all in four place at start. 1 - (1 - 0.005)^(3/4) or 0.005*4/3 are both about 0.0067 = 0.67%, see belo
fine total fine soil EC

lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr

86.89 (f) 66.31 (f) 63.9 (g) 2.45 (g) 51.88 (h) 16.70 (i) 35.18 (j) 71.06

75.20 (f) 57.39 (f) 55.3 (g) 2.12 (g) 40.24 (h) 2.54 (i) 37.69 (j) 10.82

107.87 (f) 82.33 (f) 79.3 (g) 3.05 (g) 54.02 (h) 17.39 (i) 36.63 (j) 73.99

; NOx emissions of 0.05 lb/MMBtu

on”, William Battye and Kathy Boyer, EPA Contract No. 68-D-98-046, January 2002.

Oxidation of fuel S is 0.111% during combustion (based on EPRI). Coal sulfur content is 0.593% and 

4 emissions are determined by: 0.00111 x 0.593%/100 x 1/10,496 x 1,000,000 x Heat Input x 

 of 9 days/unit over the 3 year period were excluded because emissions reflected startup, shutdown or malfunction.

coarse

Fine

total H2SO4 organic

Filterable PM10 Condensable PM10 H2SO4 

before NH3 

interaction, 

after ESP
s 20.9% oxygen

W. is 17 lb/lb.mol

 = volume of 1 ft3 of gas at STP

e split is irrelevant, and only total amount of SO4 matters for modeling. (Since all SO4 forms are 

2008 value EPA used in ANPRM of 0.49 and in lieu of the value of 0.36 cited in the EPRI 2010 for 

oth about 0.0067 = 0.67%, see below
lb/hr lb mole/hr lb mole/hr mole ratio lb mole/hr lb mole/hr lb mole/hr lb mole/hr

3.99 (k) 0.234 0.724 0.323 0.490 0.234 0.000 0.000 

0 0 0.026 

4.15 (k) 0.244 0.754 0.323 0.510 0.244 0.000 0.000 

[H2SO4]

[NH3] / 

[H2SO4] 

ratio

[H2SO4] 

after 

reaction

[AbS] or 

[NH4HSO4] 

after 

reaction

[AS] or 

[(NH4)2SO

4] after 

reaction

[NH3] after 

reaction NH3 Slip [NH3]

Ammonia slip and reaction with sulfuric acid, for Net ammonia slip and Modeling SO4

H2SO4 HCl HF HCl + HF HCl+HF+

Pmfine

lb/hr lb/hr lb/hr lb/hr lb/mmbtu lb/mmbtu lb/Mmbtu lb/hr new PM 

fine

0.00 17.64 16.35 206.02 0.0019 0 0 0 63.86

0 0.60 2.49 172.77 0.0003 0 0 0 55.27

0.00 18.36 17.03 245.192 0.0019 0 0 0 79.28

Net NH3 

after 

reaction & 

WFGD

H2SO4 + 

AbS + AS 

post-control

Total 

Effective 

SO4 for 

modeling

Total PM10

 Modeling SO4

For copying to Word version of tables

Highlight numbers portion of table here, copy; then goto Word, highlight numbers section of its table, pas

Control Option 6: SCR Units 1 and 3, LNB on Unit 2

Filterable PM10

Max Heat 

Input SO2 NOx H2SO4 NH3 PM coarse PM fine soil

MMBtu/hr lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu

Unit 1 8,795 0.06 0.05 0.0019 0 0.010 0.007

Unit 2 9,423 0.06 0.24 0.0003 0 0.008 0.006

Unit 3 9,157 0.06 0.05 0.0019 0 0.012 0.009

Filterable PM10

Max Heat 

Input SO2 NOx H2SO4 NH3 PM coarse PM fine soil

MMBtu/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr

Unit 1 8,795 487.75 439.74 16.70 0 86.89 63.86

Unit 2 9,423 526.92 2261.63 2.54 0 75.20 55.27

Unit 3 9,157 576.17 457.87 17.39 0 107.87 79.28

3159.24

rs section of its table, paste

Condensable PM10 (CPM)Filterable PM

PM fine 

EC

inorganic 

(SO4)

organic 

(SOA)

Max Stack 

Test

lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu

0.00028 0.0019 0.0040 0.026

0.00023 0.0003 0.0040 0.021

0.00033 0.0019 0.0040 0.031

Condensable PM10 (CPM) lb/hr with pollutants in order expected by CALPUFF, round

PM fine 

EC

inorganic 

(SO4)

organic 

(SOA)

Max Stack 

Test

lb/hr lb/hr lb/hr lb/hr scen SRCNAM SO2 SO4 NOX

2.45 16.35 35.18 228.66 n6 NGS1 487.75 16.35 439.74

2.12 2.49 37.69 197.89 n6 NGS2 526.92 2.49 2261.63

3.05 17.03 36.63 283.88 n6 NGS3 576.17 17.03 457.87

ected by CALPUFF, rounded to 2 decimals

HNO3 NO3 SOA PMF PMC EC

0 0 35.18 63.86 86.89 2.45

0 0 37.69 55.27 75.20 2.12

0 0 36.63 79.28 107.87 3.05
Control Option 7: Low NOx Burners, Separated Overfire Air, and Selective Catalytic Reduction (Un

MMBtu/day MMBtu/hr % ton/day lb/hr

Navajo 1

750 MW, PC, 

bituminous coal, dry

bottom, tangential 

fired, LNB, SOFA, 

hot side ESP, SCR, 

wet FGD

211,074 8,795 0.593 5.85 487.75

Navajo 2

750 MW, PC, 

bituminous coal, dry

bottom, tangential 

fired, LNB, SOFA, 

hot side ESP, SCR, 

wet FGD

226,163 9,423 0.593 6.32 526.92

Navajo 3

750 MW, PC, 

bituminous coal, dry

bottom, tangential 

fired, LNB, SOFA, 

hot side ESP, SCR, 

wet FGD

219,778 9,157 0.593 6.91 576.17

Unit conversion for ammonia slip from ppmvd to lb/hr

NH3 0.75 ppmvd at 6% O2

(l) Ammonia is assumed to react with SO4 to form ammonium sulfate per EPRI 2008 if the molecules of NH3 are at least twice 

(f) For a dry bottom boiler with an ESP, 67% of filterable PM is PM10 and 29% is fine PM10 (PM2.5) based on AP-42, Table 1.1

(g) Elemental carbon is 3.7% of fine PM based on the best estimate for electric utility coal combustion in Table 6 of “Catalog of 

(h) Total condensable PM10 is the sum of H2SO4 and organic condensable PM10 emissions. 

(i) H2SO4 emissions are based on "Estimating Total Sulfuric Acid Emissions from Stationary Power Plants", Electric Power Res

the heating value is 10,496 Btu/lb. H2SO4 control efficiency is 37% for a hot side ESP, 10% for an air preheater, and 53% for w

98.06/32.07 x 0.63 x 0.9 x 0.47. EPRI (2008) Eqn 4-2b indicates that 95% of fuel sulfur is converted to SO2.

(j) Organic condensable PM10 is 0.20 x 0.02 lb/MMBtu = 0.004 lb/MMBtu with FGD based on AP-42, Table 1.1-5, September 19

(k) Ammonia slip is 0.75 ppmvd at 6% O2 for SCR.

** Below are the Original footnotes from AECOM - EPA revisions to the footnotes/emission inputs 

(a) Maximum daily 24 hour actual heat input based on Part 75 monitoring data for the 2001 - 2003 period. Unit 1 based on 12/0

(b) Maximum fuel sulfur content is based on daily data for the 2001 to 2003 period. Maximum sulfur content is 0.593% with a he

(c) Maximum daily 24 hour actual emissions based on Part 75 monitoring data for the 2001 - 2003 period. Unit 1 based on 05/1

(d) Maximum daily/24 hour actual emissions based on Part 75 monitoring data for the 2001 - 2003 period. Unit 1 based on 04/1

(e) Maximum of 6 stack test results for the 2001 to 2006 period.

Facility Unit Description

Maximum Heat Input (a)

Maximum 

Sulfur 

Content (b)

Maximum SO2 Emissions 
0.00045 lb/MMBtu

unit 1 3.99 lb/hr

unit 2 4.27 lb/hr

unit 3 4.15 lb/hr

(6) The 0.63 ESP penetration is applied to fuel S oxidation H2SO4 (but not to catalyst oxidation, which occurs after the ESP) be

SCR conversion of SO2 to SO3

99.50% = fraction SO2 remaining after 3 layers, corresponding t

layers conversion

1 0.17%

2 0.33%

3 0.50%

4 0.67%

Penetration factors H2SO4 AbS and AS PM, general

p % ctrl p % ctrl p

hot-side ESP 0.63 37% 0.01 99% 0.01

Air Preheater 0.50 50% 0.75 25%

Wet FGD (scrubber) 0.47 53% 0.50 50%

EPRI H2SO4 doc EPRI NH3 doc

(5) Ammonia slip calculation only affects split between H2SO4 and ammonium sulfate/bisulfate. Since in this case there is no am

assumed to be affected the same way, the SO4 for modeling can also be calculated directly from H2SO4 * 96.06/98.08.)

EPA revisions to Values used in ANPRM (3-7-11)

(1) set HCl and HF to zero

(2) in sulfuric acid calculation, revised penetration factor for hot-side ESP from 1 (used in ANPRM) to 0.63. 

(3) in sulfuric acid calculation, used EPRI 2010 Technical Update value of 0.5 for penetration through air preheater for low S Ea

PRB coal (strongly alkaline coal)

(4) 0.67% SO2 to SO3 conversion efficiency : Three layers give 0.5% conversion; may not have 4th till 3rd year, but conservativ
Catalytic Reduction (Units 1, 2 & 3), SCR after ESP _ EPA modified to use Ultra-low activity catalyst and NOx 

lb/MMBtu % reduction ton/day lb/hr lb/MMBtu lb/MMBtu(e) lb/hr lb/hr

0.055 90% 5.28 439.74 0.050 0.026 228.66 153.20 (f)

0.056 89% 5.65 471.17 0.050 0.021 197.89 132.59 (f)

0.063 89% 5.49 457.87 0.050 0.031 283.88 190.20 (f)

Method 19 (SO2 removal efficiency) formula, Eq. 19-1:

ules of NH3 are at least twice those of H2SO4; otherwise, ammonium bisulfate is formed. 

.5) based on AP-42, Table 1.1-6, September 1998.

stion in Table 6 of “Catalog of Global Emissions Inventories and Emission Inventory Tools for Black Carbon”, William Battye and Kathy Boye

er Plants", Electric Power Research Institute, Technical Update, March, 2008 and Hardman et al., 1998. Oxidation of fuel S is 0.111% durin

n air preheater, and 53% for wet FGD. 100% of the flue gas is controlled by wet FGD. Therefore, H2SO4 emissions are determined by: 0.0

42, Table 1.1-5, September 1998. 

notes/emission inputs are explained separately

 period. Unit 1 based on 12/09/03, Unit 2 based on 11/13/02, and Unit 3 based on 01/31/02.

fur content is 0.593% with a heating value of 10,496 Btu/lb based on 01/08/03.

3 period. Unit 1 based on 05/19/03, Unit 2 based on 05/07/03, and Unit 3 based on 03/31/03. An average of 9 days/unit over the 3 year perio

3 period. Unit 1 based on 04/15/01, Unit 2 based on 03/12/01, and Unit 3 based on 03/26/01.

total

Maximum Filterable

PM Emissions

Maximum Emissions Including Speciated PM10 Emissions

Navajo Units 1, 2, and 3

m SO2 Emissions (c) Maximum NOx Emissions (d)
E = Cd*Fd*20.9/(20.9 - %O2d) Atmosphere is 20.9% oxygen

Cd = Pollutant concentration, dry basis Ammonia M.W. is 17 lb/lb.mol

Fd = volumes of combustion components per unit of heat content 385 ft3/lb-mol = volume of 1 ft3 of gas at STP

%O2d = Concentration of oxygen on a dry basis, percent.

Table 19-2 gives F factor for bituminous coal as Fd = 9780 sdcf/10^6 Btu

which occurs after the ESP) before the ammonia reaction, which mainly occurs in the lower temperatures of the air preheater.

after 3 layers, corresponding to 0.5% conversion

% ctrl

99%

ince in this case there is no ammonia slip, and controls are assumed to affect all these the same way, the split is irrelevant, and only total am

H2SO4 * 96.06/98.08.)

ugh air preheater for low S Eastern Bituminous coal (e.g. low alkalinity coal), changed slightly from EPRI 2008 value EPA used in ANPRM of 

th till 3rd year, but conservatively assume all in four place at start. 1 - (1 - 0.005)^(3/4) or 0.005*4/3 are both about 0.0067 = 0.67%, see belo
w activity catalyst and NOx limit 0.05 lb/MMBtu

fine total fine soil EC

lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr

86.89 (f) 66.31 (f) 63.9 (g) 2.45 (g) 60.29 (h) 25.11 (i) 35.18 (j) 106.86

75.20 (f) 57.39 (f) 55.3 (g) 2.12 (g) 64.60 (h) 26.91 (i) 37.69 (j) 114.49

107.87 (f) 82.33 (f) 79.3 (g) 3.05 (g) 62.78 (h) 26.15 (i) 36.63 (j) 111.26

on”, William Battye and Kathy Boyer, EPA Contract No. 68-D-98-046, January 2002.

Oxidation of fuel S is 0.111% during combustion (based on EPRI). Coal sulfur content is 0.593% and 

4 emissions are determined by: 0.00111 x 0.593%/100 x 1/10,496 x 1,000,000 x Heat Input x 

 of 9 days/unit over the 3 year period were excluded because emissions reflected startup, shutdown or malfunction.

coarse

Fine

total H2SO4 organic

Filterable PM10 Condensable PM10 H2SO4 

before NH3 

interaction, 

after ESP
s 20.9% oxygen

W. is 17 lb/lb.mol

 = volume of 1 ft3 of gas at STP

 of the air preheater.

e split is irrelevant, and only total amount of SO4 matters for modeling. (Since all SO4 forms are 

2008 value EPA used in ANPRM of 0.49 and in lieu of the value of 0.36 cited in the EPRI 2010 for 

oth about 0.0067 = 0.67%, see below
lb/hr lb mole/hr lb mole/hr mole ratio lb mole/hr lb mole/hr lb mole/hr lb mole/hr

3.99 (k) 0.234 1.089 0.215 0.855 0.234 0.000 0.000 

4.27 (k) 0.251 1.167 0.215 0.916 0.251 0.000 0.000 

4.15 (k) 0.244 1.134 0.215 0.890 0.244 0.000 0.000 

[H2SO4]

[NH3] / 

[H2SO4] 

ratio

[H2SO4] 

after 

reaction

[AbS] or 

[NH4HSO4] 

after 

reaction

[AS] or 

[(NH4)2SO

4] after 

reaction

[NH3] after 

reaction NH3 Slip [NH3]

Ammonia slip and reaction with sulfuric acid, for Net ammonia slip and Modeling SO4

H2SO4 HCl HF HCl + HF HCl+HF+

Pmfine

lb/hr lb/hr lb/hr lb/hr lb/mmbtu lb/mmbtu lb/Mmbtu lb/hr new PM 

fine

0.00 26.05 24.59 214.43 0.0029 0 0 0 63.86

0.00 27.91 26.35 198.193 0.0029 0 0 0 55.27

0.00 27.12 25.61 253.952 0.0029 0 0 0 79.28

Net NH3 

after 

reaction & 

WFGD

H2SO4 + 

AbS + AS 

post-control

Total 

Effective 

SO4 for 

modeling

Total PM10

 Modeling SO4

For copying to Word version of tables

Highlight numbers portion of table here, copy; then goto Word, highlight numbers section of its table, pas

Control Option 7: SCR Units 1 - 3, after ESP

Filterable PM10

Max Heat 

Input SO2 NOx H2SO4 NH3 PM coarse PM fine soil

MMBtu/hr lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu

Unit 1 8,795 0.06 0.05 0.0029 0 0.010 0.007

Unit 2 9,423 0.06 0.05 0.0029 0 0.008 0.006

Unit 3 9,157 0.06 0.05 0.0029 0 0.012 0.009

Filterable PM10

Max Heat 

Input SO2 NOx H2SO4 NH3 PM coarse PM fine soil

MMBtu/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr

Unit 1 8,795 487.75 439.74 25.11 0 86.89 63.86

Unit 2 9,423 526.92 471.17 16.70 0 75.20 55.27

Unit 3 9,157 576.17 457.87 16.70 0 107.87 79.28

1368.78

rs section of its table, paste

Condensable PM10 (CPM)Filterable PM

PM fine 

EC

inorganic 

(SO4)

organic 

(SOA)

Max Stack 

Test

lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu

0.00028 0.0028 0.0040 0.026

0.00023 0.0028 0.0040 0.021

0.00033 0.0028 0.0040 0.031

Condensable PM10 (CPM) lb/hr with pollutants in order expected by CALPUFF, round

PM fine 

EC

inorganic 

(SO4)

organic 

(SOA)

Max Stack 

Test

lb/hr lb/hr lb/hr lb/hr scen SRCNAM SO2 SO4 NOX

2.45 24.59 35.18 228.66 n7 NGS1 487.75 24.59 439.74

2.12 26.35 37.69 197.89 n7 NGS2 526.92 26.35 471.17

3.05 25.61 36.63 283.88 n7 NGS3 576.17 25.61 457.87

ected by CALPUFF, rounded to 2 decimals

HNO3 NO3 SOA PMF PMC EC

0 0 35.18 63.86 86.89 2.45

0 0 37.69 55.27 75.20 2.12

0 0 36.63 79.28 107.87 3.05
Control Option 8: Low NOx Burners, Separated Overfire Air, and Selective Non-Catalytic Reduction 

MMBtu/day MMBtu/hr % ton/day lb/hr

Navajo 1

750 MW, PC, 

bituminous coal, dry

bottom, tangential 

fired, LNB, SOFA, 

SNCR, hot side ESP, 

wet FGD

211,074 8,795 0.593 5.85 487.75

Navajo 2

750 MW, PC, 

bituminous coal, dry

bottom, tangential 

fired, LNB, SOFA, 

SNCR, hot side ESP, 

wet FGD

226,163 9,423 0.593 6.32 526.92

Navajo 3

750 MW, PC, 

bituminous coal, dry

bottom, tangential 

fired, LNB, SOFA, 

SNCR, hot side ESP, 

wet FGD

219,778 9,157 0.593 6.91 576.17

Unit conversion for ammonia slip from ppmvd to lb/hr

NH3 5.00 ppmvd at 6% O2

(f) For a dry bottom boiler with an ESP, 67% of filterable PM is PM10 and 29% is fine PM10 (PM2.5) based on AP-42, Table 1.1

** Below are the Original footnotes from AECOM - EPA revisions to the footnotes/emission inputs 

(a) Maximum daily 24 hour actual heat input based on Part 75 monitoring data for the 2001 - 2003 period. Unit 1 based on 12/0

(b) Maximum fuel sulfur content is based on daily data for the 2001 to 2003 period. Maximum sulfur content is 0.593% with a he

(c) Maximum daily 24 hour actual emissions based on Part 75 monitoring data for the 2001 - 2003 period. Unit 1 based on 05/1

or malfunction.

(d) Maximum daily 24 hour actual emissions based on Part 75 monitoring data for the 2001 - 2003 period. Unit 1 based on 04/1

Facility Unit Description

Maximum Heat Input (a)

Maximum 

Sulfur 

Content (b)

Maximum SO2 Emissions 

(e) Maximum of 6 stack test results for the 2001 to 2006 period.

(g) Elemental carbon is 3.7% of fine PM based on the best estimate for electric utility coal combustion in Table 6 of “Catalog of 

(h) Total condensible PM10 is the sum of H2SO4 and organic condensible PM10 emissions. 

(i) H2SO4 emissions are based on "Estimating Total Sulfuric Acid Emissions from Stationary Power Plants", Electric Power Res

the heating value is 10,496 Btu/lb. H2SO4 control efficiency is 37% for a hot side ESP, 10% for an air preheater, and 53% for w

98.06/32.07 x 0.63 x 0.9 x 0.47. EPRI (2008) Eqn 4-2b indicates that 95% of fuel sulfur is converted to SO2.

(j) Organic condensible PM10 is 0.20 x 0.02 lb/MMBtu = 0.004 lb/MMBtu with FGD based on AP-42, Table 1.1-5, September 19
0.00302 lb/MMBtu

unit 1 26.60 lb/hr

unit 2 28.50 lb/hr

unit 3 27.69 lb/hr

Penetration factors H2SO4 AbS and AS PM, general

p % ctrl p % ctrl p

hot-side ESP 0.63 37% 0.01 99% 0.01

Air Preheater 0.50 50% 0.75 25%

Wet FGD (scrubber) 0.47 53% 0.50 50%

EPRI H2SO4 doc EPRI NH3 doc

(2) updated Ammonia-Sulfuric acid reaction to accommodate full range of NH3/H2SO4 ratios, and accounted for molecular weig

(2) in sulfuric acid calculation, used EPRI 2010 Technical Update value of 0.5 for penetration through air preheater for low S Ea

PRB coal (strongly alkaline coal)

EPA revisions

(1) in sulfuric acid calculation, revised penetration factor for hot-side ESP from 1 (used in ANPRM) to 0.63. 
Non-Catalytic Reduction at 0.18 lb/MMBtu (Units 1, 2 & 3)

lb/MMBtu % reduction ton/day lb/hr lb/MMBtu lb/MMBtu(e) lb/hr lb/hr

0.055 63% 19.00 1,583.06 0.180 0.026 228.66 153.20 (f)

0.056 60% 20.35 1,696.22 0.180 0.021 197.89 132.59 (f)

0.063 61% 19.78 1,648.34 0.180 0.031 283.88 190.20 (f)

Method 19 (SO2 removal efficiency) formula, Eq. 19-1:

.5) based on AP-42, Table 1.1-6, September 1998.

notes/emission inputs are explained separately

 period. Unit 1 based on 12/09/03, Unit 2 based on 11/13/02, and Unit 3 based on 01/31/02.

fur content is 0.593% with a heating value of 10,496 Btu/lb based on 01/08/03.

3 period. Unit 1 based on 05/19/03, Unit 2 based on 05/07/03, and Unit 3 based on 03/31/03. An average of 9 days/unit over the 3 year perio

3 period. Unit 1 based on 04/15/01, Unit 2 based on 03/12/01, and Unit 3 based on 03/26/01.

Maximum Emissions Including Speciated PM10 Emissions

Navajo Units 1, 2, and 3

m SO2 Emissions (c) Maximum NOx Emissions (d) Maximum Filterable

PM Emissions

total

stion in Table 6 of “Catalog of Global Emissions Inventories and Emission Inventory Tools for Black Carbon”, William Battye and Kathy Boye

er Plants", Electric Power Research Institute, Technical Update, March, 2008 and Hardman et al., 1998. Oxidation of fuel S is 0.111% durin

n air preheater, and 53% for wet FGD. 100% of the flue gas is controlled by wet FGD. Therefore, H2SO4 emissions are determined by: 0.0

42, Table 1.1-5, September 1998. 
E = Cd*Fd*20.9/(20.9 - %O2d) Atmosphere is 20.9% oxygen

Cd = Pollutant concentration, dry basis Ammonia M.W. is 17 lb/lb.mol

Fd = volumes of combustion components per unit of heat content 385 ft3/lb-mol = volume of 1 ft3 of gas at STP

%O2d = Concentration of oxygen on a dry basis, percent.

Table 19-2 gives F factor for bituminous coal as Fd = 9780 sdcf/10^6 Btu

% ctrl

99%

d accounted for molecular weight of ammonium sulfate (AS) and bisulfate (AbS)

ugh air preheater for low S Eastern Bituminous coal (e.g. low alkalinity coal), changed slightly from EPRI 2008 value EPA used in ANPRM of 
fine total fine soil EC

lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr

86.89 (f) 66.31 (f) 63.9 (g) 2.45 (g) 37.55 (h) 2.37 (i) 35.18 (j) 10.10

75.20 (f) 57.39 (f) 55.3 (g) 2.12 (g) 40.24 (h) 2.54 (i) 37.69 (j) 10.82

107.87 (f) 82.33 (f) 79.3 (g) 3.05 (g) 39.10 (h) 2.47 (i) 36.63 (j) 10.52

 of 9 days/unit over the 3 year period were excluded because emissions reflected startup, shutdown 

Filterable PM10 Condensable PM10 H2SO4 

before NH3 

interaction, 

after ESP coarse organic

Fine

total H2SO4

on”, William Battye and Kathy Boyer, EPA Contract No. 68-D-98-046, January 2002.

Oxidation of fuel S is 0.111% during combustion (based on EPRI). Coal sulfur content is 0.593% and 

4 emissions are determined by: 0.00111 x 0.593%/100 x 1/10,496 x 1,000,000 x Heat Input x 
s 20.9% oxygen

W. is 17 lb/lb.mol

 = volume of 1 ft3 of gas at STP

2008 value EPA used in ANPRM of 0.49 and in lieu of the value of 0.36 cited in the EPRI 2010 for 
lb/hr lb mole/hr lb mole/hr mole ratio lb mole/hr lb mole/hr lb mole/hr lb mole/hr

26.60 (k) 1.562 0.103 15.167 0.000 0.000 0.103 1.356 

28.50 (k) 1.673 0.110 15.167 0.000 0.000 0.110 1.453 

27.69 (k) 1.626 0.107 15.167 0.000 0.000 0.107 1.412 

Ammonia slip and reaction with sulfuric acid, for Net ammonia slip and Modeling SO4

[AS] or 

[(NH4)2SO

4] after 

reaction

NH3 Slip [NH3] [NH3] after 

reaction [H2SO4]

[NH3] / 

[H2SO4] 

ratio

[H2SO4] 

after 

reaction

[AbS] or 

[NH4HSO4] 

after 

reaction

For copying to Word version of tables

Highlight numbers portion of table here, copy; then in Word, hig

Control Option 8: SNCR Units 1 - 3

Max Heat 

Input SO2 NOx

lb/hr lb/hr lb/hr lb/hr MMBtu/hr lb/MMBtu lb/MMBtu

2.309 3.197 2.32 191.58 Unit 1 8,795 0.06 0.18

2.474 3.426 2.490 173.708 Unit 2 9,423 0.06 0.18

2.404 3.329 2.420 230.158 Unit 3 9,157 0.06 0.18

Max Heat 

Input SO2 NOx

MMBtu/hr lb/hr lb/hr

Unit 1 8,795 487.75 1583.06

Unit 2 9,423 526.92 1696.22

Unit 3 9,157 576.17 1648.34

4927.61

 Modeling SO4

Net NH3 

after 

reaction & 

WFGD

H2SO4 + 

AbS + AS 

post-control

Total 

Effective 

SO4 for 

modeling

Total PM10

ion of tables

 here, copy; then in Word, highlight numbers section of its table, paste

Filterable PM10 Condensable PM10 (CPM)Filterable PM

H2SO4 NH3 PM coarse PM fine 

soil

PM fine 

EC

inorganic 

(SO4)

organic 

(SOA)

Max Stack 

Test

lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu

0.0003 0 0.010 0.000 0.00028 0.0003 0.0040 0.026

0.0003 0 0.008 0.000 0.00023 0.0003 0.0040 0.021

0.0003 0 0.012 0.000 0.00033 0.0003 0.0040 0.031

Filterable PM10 Condensable PM10 (CPM)Filterable PM lb/hr with pollutants 

H2SO4 NH3 PM coarse PM fine 

soil

PM fine 

EC

inorganic 

(SO4)

organic 

(SOA)

Max Stack 

Test

lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr scen

2.37 0 86.89 0.03 2.45 2.32 35.18 228.66 n8

16.70 0 75.20 0.02 2.12 2.49 37.69 197.89 n8

16.70 0 107.87 0.03 3.05 2.42 36.63 283.88 n8

lb/hr with pollutants in order expected by CALPUFF, rounded to 2 decimals

SRCNAM SO2 SO4 NOX HNO3 NO3 SOA PMF PMC EC

NGS1 487.75 2.32 1583.06 0 0 35.18 0.03 86.89 2.45

NGS2 526.92 2.49 1696.22 0 0 37.69 0.02 75.20 2.12

NGS3 576.17 2.42 1648.34 0 0 36.63 0.03 107.87 3.05
Control Option 8: Low NOx Burners, Separated Overfire Air, and Selective Non-Catalytic Reduction 

MMBtu/day MMBtu/hr % ton/day lb/hr

Navajo 1

750 MW, PC, 

bituminous coal, dry

bottom, tangential 

fired, LNB, SOFA, 

SNCR, hot side ESP, 

wet FGD

211,074 8,795 0.593 5.85 487.75

Navajo 2

750 MW, PC, 

bituminous coal, dry

bottom, tangential 

fired, LNB, SOFA, 

SNCR, hot side ESP, 

wet FGD

226,163 9,423 0.593 6.32 526.92

Navajo 3

750 MW, PC, 

bituminous coal, dry

bottom, tangential 

fired, LNB, SOFA, 

SNCR, hot side ESP, 

wet FGD

219,778 9,157 0.593 6.91 576.17

Unit conversion for ammonia slip from ppmvd to lb/hr

NH3 5.00 ppmvd at 6% O2

(e) Maximum of 6 stack test results for the 2001 to 2006 period.

(f) For a dry bottom boiler with an ESP, 67% of filterable PM is PM10 and 29% is fine PM10 (PM2.5) based on AP-42, Table 1.1

(g) Elemental carbon is 3.7% of fine PM based on the best estimate for electric utility coal combustion in Table 6 of “Catalog of 

(h) Total condensible PM10 is the sum of H2SO4 and organic condensible PM10 emissions. 

(i) H2SO4 emissions are based on "Estimating Total Sulfuric Acid Emissions from Stationary Power Plants", Electric Power Res

the heating value is 10,496 Btu/lb. H2SO4 control efficiency is 37% for a hot side ESP, 10% for an air preheater, and 53% for w

98.06/32.07 x 0.63 x 0.9 x 0.47. EPRI (2008) Eqn 4-2b indicates that 95% of fuel sulfur is converted to SO2.

(j) Organic condensible PM10 is 0.20 x 0.02 lb/MMBtu = 0.004 lb/MMBtu with FGD based on AP-42, Table 1.1-5, September 19

** Below are the Original footnotes from AECOM - EPA revisions to the footnotes/emission inputs 

(a) Maximum daily 24 hour actual heat input based on Part 75 monitoring data for the 2001 - 2003 period. Unit 1 based on 12/0

(b) Maximum fuel sulfur content is based on daily data for the 2001 to 2003 period. Maximum sulfur content is 0.593% with a he

(c) Maximum daily 24 hour actual emissions based on Part 75 monitoring data for the 2001 - 2003 period. Unit 1 based on 05/1

or malfunction.

(d) Maximum daily 24 hour actual emissions based on Part 75 monitoring data for the 2001 - 2003 period. Unit 1 based on 04/1

Facility Unit Description

Maximum Heat Input (a)

Maximum 

Sulfur 

Content (b)

Maximum SO2 Emissions 
0.00302 lb/MMBtu

unit 1 26.60 lb/hr

unit 2 28.50 lb/hr

unit 3 27.69 lb/hr

Penetration factors H2SO4 AbS and AS PM, general

p % ctrl p % ctrl p

hot-side ESP 0.63 37% 0.01 99% 0.01

Air Preheater 0.50 50% 0.75 25%

Wet FGD (scrubber) 0.47 53% 0.50 50%

EPRI H2SO4 doc EPRI NH3 doc

EPA revisions

(1) in sulfuric acid calculation, revised penetration factor for hot-side ESP from 1 (used in ANPRM) to 0.63. 

(2) in sulfuric acid calculation, used EPRI 2010 Technical Update value of 0.5 for penetration through air preheater for low S Ea

PRB coal (strongly alkaline coal)

(2) updated Ammonia-Sulfuric acid reaction to accommodate full range of NH3/H2SO4 ratios, and accounted for molecular weig
Non-Catalytic Reduction at 0.15 lb/MMBtu (Units 1, 2 & 3)

lb/MMBtu % reduction ton/day lb/hr lb/MMBtu lb/MMBtu(e) lb/hr lb/hr

0.055 69% 15.83 1,319.21 0.150 0.026 228.66 153.20 (f)

0.056 66% 16.96 1,413.52 0.150 0.021 197.89 132.59 (f)

0.063 67% 16.48 1,373.61 0.150 0.031 283.88 190.20 (f)

Method 19 (SO2 removal efficiency) formula, Eq. 19-1:

.5) based on AP-42, Table 1.1-6, September 1998.

stion in Table 6 of “Catalog of Global Emissions Inventories and Emission Inventory Tools for Black Carbon”, William Battye and Kathy Boye

er Plants", Electric Power Research Institute, Technical Update, March, 2008 and Hardman et al., 1998. Oxidation of fuel S is 0.111% durin

n air preheater, and 53% for wet FGD. 100% of the flue gas is controlled by wet FGD. Therefore, H2SO4 emissions are determined by: 0.0

42, Table 1.1-5, September 1998. 

notes/emission inputs are explained separately

 period. Unit 1 based on 12/09/03, Unit 2 based on 11/13/02, and Unit 3 based on 01/31/02.

fur content is 0.593% with a heating value of 10,496 Btu/lb based on 01/08/03.

3 period. Unit 1 based on 05/19/03, Unit 2 based on 05/07/03, and Unit 3 based on 03/31/03. An average of 9 days/unit over the 3 year perio

3 period. Unit 1 based on 04/15/01, Unit 2 based on 03/12/01, and Unit 3 based on 03/26/01.

total

Maximum NOx Emissions (d) Maximum Filterable

PM Emissions

Maximum Emissions Including Speciated PM10 Emissions

Navajo Units 1, 2, and 3

m SO2 Emissions (c)
E = Cd*Fd*20.9/(20.9 - %O2d) Atmosphere is 20.9% oxygen

Cd = Pollutant concentration, dry basis Ammonia M.W. is 17 lb/lb.mol

Fd = volumes of combustion components per unit of heat content 385 ft3/lb-mol = volume of 1 ft3 of gas at STP

%O2d = Concentration of oxygen on a dry basis, percent.

Table 19-2 gives F factor for bituminous coal as Fd = 9780 sdcf/10^6 Btu

% ctrl

99%

ugh air preheater for low S Eastern Bituminous coal (e.g. low alkalinity coal), changed slightly from EPRI 2008 value EPA used in ANPRM of 

d accounted for molecular weight of ammonium sulfate (AS) and bisulfate (AbS)
fine total fine soil EC

lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr

86.89 (f) 66.31 (f) 63.9 (g) 2.45 (g) 37.55 (h) 2.37 (i) 35.18 (j) 10.10

75.20 (f) 57.39 (f) 55.3 (g) 2.12 (g) 40.24 (h) 2.54 (i) 37.69 (j) 10.82

107.87 (f) 82.33 (f) 79.3 (g) 3.05 (g) 39.10 (h) 2.47 (i) 36.63 (j) 10.52

on”, William Battye and Kathy Boyer, EPA Contract No. 68-D-98-046, January 2002.

Oxidation of fuel S is 0.111% during combustion (based on EPRI). Coal sulfur content is 0.593% and 

4 emissions are determined by: 0.00111 x 0.593%/100 x 1/10,496 x 1,000,000 x Heat Input x 

 of 9 days/unit over the 3 year period were excluded because emissions reflected startup, shutdown 

coarse

Fine

total H2SO4 organic

Filterable PM10 Condensable PM10 H2SO4 

before NH3 

interaction, 

after ESP
s 20.9% oxygen

W. is 17 lb/lb.mol

 = volume of 1 ft3 of gas at STP

2008 value EPA used in ANPRM of 0.49 and in lieu of the value of 0.36 cited in the EPRI 2010 for 
lb/hr lb mole/hr lb mole/hr mole ratio lb mole/hr lb mole/hr lb mole/hr lb mole/hr

26.60 (k) 1.562 0.103 15.167 0.000 0.000 0.103 1.356 

28.50 (k) 1.673 0.110 15.167 0.000 0.000 0.110 1.453 

27.69 (k) 1.626 0.107 15.167 0.000 0.000 0.107 1.412 

Ammonia slip and reaction with sulfuric acid, for Net ammonia slip and Modeling SO4

[NH3] / 

[H2SO4] 

ratio

[NH3]

[H2SO4] 

after 

reaction

[AbS] or 

[NH4HSO4] 

after 

reaction

[AS] or 

[(NH4)2SO

4] after 

reaction

[NH3] after 

reaction NH3 Slip [H2SO4]

For copying to Word version of tables

Highlight numbers portion of table here, copy; then in Word, hig

Control Option 8: SNCR Units 1 - 3

Max Heat 

Input SO2 NOx

lb/hr lb/hr lb/hr lb/hr MMBtu/hr lb/MMBtu lb/MMBtu

2.309 3.197 2.32 191.58 Unit 1 8,795 0.06 0.15

2.474 3.426 2.490 173.708 Unit 2 9,423 0.06 0.15

2.404 3.329 2.420 230.158 Unit 3 9,157 0.06 0.15

Max Heat 

Input SO2 NOx

MMBtu/hr lb/hr lb/hr

Unit 1 8,795 487.75 1319.21

Unit 2 9,423 526.92 1413.52

Unit 3 9,157 576.17 1373.61

4106.34

 Modeling SO4

H2SO4 + 

AbS + AS 

post-control

Total 

Effective 

SO4 for 

modeling

Total PM10

Net NH3 

after 

reaction & 

WFGD

ion of tables

 here, copy; then in Word, highlight numbers section of its table, paste

Filterable PM10 Condensable PM10 (CPM)Filterable PM

H2SO4 NH3 PM coarse PM fine 

soil

PM fine 

EC

inorganic 

(SO4)

organic 

(SOA)

Max Stack 

Test

lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu lb/MMBtu

0.0003 0 0.010 0.000 0.00028 0.0003 0.0040 0.026

0.0003 0 0.008 0.000 0.00023 0.0003 0.0040 0.021

0.0003 0 0.012 0.000 0.00033 0.0003 0.0040 0.031

Filterable PM10 Condensable PM10 (CPM)Filterable PM lb/hr with pollutants 

H2SO4 NH3 PM coarse PM fine 

soil

PM fine 

EC

inorganic 

(SO4)

organic 

(SOA)

Max Stack 

Test

lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr lb/hr scen

2.37 0 86.89 0.03 2.45 2.32 35.18 228.66 n9

16.70 0 75.20 0.02 2.12 2.49 37.69 197.89 n9

16.70 0 107.87 0.03 3.05 2.42 36.63 283.88 n9

lb/hr with pollutants in order expected by CALPUFF, rounded to 2 decimals

SRCNAM SO2 SO4 NOX HNO3 NO3 SOA PMF PMC EC

NGS1 487.75 2.32 1319.21 0 0 35.18 0.03 86.89 2.45

NGS2 526.92 2.49 1413.52 0 0 37.69 0.02 75.20 2.12

NGS3 576.17 2.42 1373.61 0 0 36.63 0.03 107.87 3.05
Parameter Unit 1 Unit 2 Unit 3 Parameter Unit 1 Unit 2 Unit 3

Height, ft 775 775 775 Height, m 236.2 236.2 236.2

Diameter, ft 24.5 24.5 24.50 Diameter, m 7.47 7.47 7.47

Flow, acfm 2,497,502 2,497,502 2,497,502 Flow, m3/s 1,178.7 1,178.7 1,178.7

Temperature, F 119 119 119 Temperature, K 321.5 321.5 321.5

Exit velocity, ft/min 5,298 5,298 5,298 Exit velocity, m/s 26.91 26.91 26.91

LC-X (km) -1267.800 -1267.790 -1267.750

LC-Y (km) -241.690 -241.784 -241.884

Navajo G.S. Stack Data (a)

09000064811c2027 Baseline stack data 1/17/2013