Androscoggin Power Boilers #1 & #2

Given/Assumptions

Generation capacity (MW) 68

Fuel High Heating Value (Btu/gal) 150,000

Maximum Fuel Consumption Rate (gal/hr) 4.5E+03

Maximum Annual Fuel Consumption (gal) 3.97E+07

Maximum Annual Heat Input (mmBtu) 5.96E+06

Actual annual heat input (mmBtu) 1.87E+06

Number of SNCR Operating Days 365

Uncontrolled NOx Concentration (lb/mmBtu) 0.41

Uncontrolled NOx Emissions (tpy) 383

Required Controlled NOx Concentration (lb/mmBtu) 0.27

ash product (Btu/mmBtu) 7.7E+04

Stored Urea Concentration 50%

Injected Urea Concentration 10%

Reagent Heat of vaporization Hv (lb/Btu) 900

Reagent Molecular Weight (g/mole) 60.06

SRT 2

Reagent Density (lb/ft3 @ 60F) 71.0

Reagent Specific Volume (gal/ft3) 7.481

NOx Molecular Weight (g/mole) 46.01

Number of Days of Storage for Urea 14

Equipment Life (years) 20

Annual Interest Rate 7%

Inflation Since 1998 1.35

Water Consumption Cost ($/gal) 0.0004

Electrical Power Cost ($/kWh) $ 0.08

50% Urea Solution Cost ($/gal) $ 1.25

Oil Cost ($/mmBtu) $ 6.71

Ash Disposal Cost ($/ton)
estimated

company report

calculated 680 mmBtu/hr from company report

calculated

calculated

calculated

OAQPS Control Cost Manual

company report

company report

calculated

OAQPS Control Cost Manual

OAQPS Control Cost Manual

OAQPS Control Cost Manual

OAQPS Control Cost Manual

OAQPS Control Cost Manual

OAQPS Control Cost Manual

OAQPS Control Cost Manual

OAQPS Control Cost Manual

OAQPS Control Cost Manual

OAQPS Control Cost Manual

OAQPS Control Cost Manual

OAQPS Control Cost Manual

CEPCI 2007/CEPCI 1998

OAQPS Control Cost Manual

company report

company report

company report

OAQPS Control Cost Manual
Boiler Calculations

1.3 QB = HVm-dotfuel

QB = 150000 Btu/lb * 4533.3333 lb/hr

QB = 680 mmBtu/hr

1.7 CFPlant = actual mfuel/maximum mfuel

CFPlant = 1.87E+06 lb/yr / 5.96E+06

CFPlant = 31%

1.8 CFSNCR = tSCR/365 days

CFSCR = 365 days/ 365 days

CFSCR = 100%

1.6 CFTotal = CFPlant x CFSNCR

CFTotal = 31% * 100%

CFTotal = 31%

1.9 ηNOx = (NOxin – NOxout) / NOxin

ηNOx = ( 0.41 lb/mmBtu - 0.2665 lb/mmBtu)/ 0.41

ηNOx = 35%

Uncontrolled NOx emissions (tpy) 383
lb/mmBtu
Reagent Calculations

1.14 NSR = [2NOxin – 0.7] ηNOx/ NOxin

NSR = ( 2 * 0.41 + 0.7 ) * # / 0.41

NSR = 1.30

1.13 Utilization = ηNOx/NSR

Utilization = 27%

1.15 m-dotreagent = NOxinQBηNOxNSR Mreagent/MNOx/SRT

m-dotreagent = 0.41 * 680 * 35% * 130% * 60.06 /

m-dotreagent = 83 lb/hr

1.16 m-dotsol = m-dotreagent/Csol

m-dotsol = 83 / 0.50

m-dotsol = 165 lb/hr

1.17 qsol = m-dotvol/ρsol

qsol = 165 * 7.481 / 71

qsol = 17 gph

2.35 Tank Volume = qsolt

Tank Volume = 17 * 14 * 24

Tank Volume = 5,851 gal
2 / 46.01
Direct Capital Cost

1.19 DC = ($950/mmBtu/hr) * QB(mmBtu/hr)[(2375/mmBtu

DC = $ 950 * 680 *( 2375 / 680 )^

DC = $ 1,272,833

Inflation Adjustment = 1.35

DC = $ 1,718,325
(mmBtu/hr)[(2375/mmBtu/hr)/QB(mmBtu/hr]0.577 * (0.66 + 0.85* ηNOx)

0.577 *( 0.66 + 0.85 * 35% )
Indirect Capital Costs

Total Direct Capital Costs, A

Indirect Installation Costs 

General Facilities 0.05

Engineering and Home Office Fees 0.10

Process Contingencies 0.05

Total Indirect Installation Costs, B 0.20

Project Contingency, C = 0.15

Total Plant Cost D =

Preproduction Cost 0.02

Inventory Capital

Total Capital Investment TCI = D+G+H
$ 1,272,833

A $63,642

A $127,283

A $63,642

A $254,567

(A+B) $229,110

A+B+C $1,756,510

D $35,130

$7,314

+D+E+F+G+H+I $1,798,955

Cost/kW = $26
Annual Costs

2.45 DAC = Annual Maintenance Cost + Annual Reagent Cost + Annual Electricity Cost + Ann

2.46 Annual Maintenance Cost = 0.015 TCI

Annual Maintenance Cost = 0.015 * $ 1,798,955

Annual Maintenance Cost = $ 26,984

1.22 Annual Reagent Cost = qsolCostreagenttop

1.22.a top = CFtotal8760hr/yr

top = 31% * 8760

top = 2748

Annual Reagent Cost = 17 * 1.25 * 2748

Annual Reagent Cost = $ 59,825

1.24 Annual Electricity Cost = Power (Costelect)top

1.23 Power = 0.47NOxinNSRQB/9.5

Power = 0.47 * 0.41 * 1.30 *

Power = 18 kW

Annual Electricity Cost = 18 * 2748 * 0.08

Annual Electricity Cost = $ 3,935

1.27 Annual Water Cost = qwaterCostwater top

1.25 qwater = m-dotsol/ρwater[Cureastored/Curea sol inj -1]

qwater = 165 / 8.345 *( 50% /

qwater = 79

Annual Water Cost = 79 * 0.0004 * 2748

Annual Water Cost = $ 87

1.31 Annual ΔCoal cost = ΔCoal costcoal top

1.28 ΔCoal(Btu/hr) = Hv(Btu/lb)* m-dotreagent(lb/hr)[1/ Curea 

ΔCoal(Btu/hr) = 900 * 165 *( 1 /

ΔCoal(Btu/hr) = 1,338,772

Annual ΔCoal cost = 1.3 * $ 6.71 * 2748

Annual ΔCoal cost = $ 24,688

1.32 Annual ΔAsh cost = ΔAsh costash top

1.30 ΔAsh = ΔCoal ash product/HHV

ΔAsh = 1 * 77000 / 2E+05

ΔAsh = 1

Annual ΔAsh cost = 1 * $ - * 2748 /

Annual ΔAsh cost = $ -

Total Variable Cost = $ 88,535

Total Direct Annual Cost = $ 26,984 + $ 88,535

Total Direct Annual Cost = $ 115,519
1.34 CRF = i(1+i)n

/[(1+i)

n

-1]

CRF = 0.07 *( 1 + 0.07 )^

CRF = 0.0944

1.33 IDAC = CRF*TCI

Indirect Annual Cost = 0.0944 * $ 1,798,955

Indirect Annual Cost = $ 169,809

1.35 Total Annual Cost = Direct Annual Cost + Indirect Annual Cost

Total Annual Cost = $ 115,519 + 169,809

Total Annual Cost = $ 285,327

1.36 NOx Removed = NOxinηNOxQBtop

NOx Removed = 0.41 * 35% * 680 *

NOx Removed = 134

1.37 Cost effectiveness = TAC/NOx

 removed

Cost effectiveness = $ 2,128

Greatest dv improvement = 0.7

SNCR Cost effectiveness ($/dv) = $ 407,611

Cumulative dv improvement = 2.15

SNCR Cost effectiveness ($/dv) = $ 132,710
al Electricity Cost + Annual Water Cost + Annual Catalyst Cost

680 / 9.5

10% - 1 )

/hr)[1/ Curea sol inj -1]

10% - 1 )

2000
20 /(( 1 + 0.07 )^ 20 - 1 )

ndirect Annual Cost

2748 / 2000
Mill High (dv)

Class I Area Mill PB #1+#2

Acadia NP 3.7 2.8

Great Gulf WA 2.2 1.7

Lye Brook WA 1.0

Moosehorn WA 1.7 1.3

Presidential Range-Dry River WA 2.9 2.3

Roosevelt Campobello IP 1.6

13.1 8.1

PB #1+#2 High (dv)

Class I Area 0.7% S WS SCR SNCR

Acadia NP 1.9 1.3 1.1 1.4

Great Gulf WA 1.0 0.8 0.7

Lye Brook WA

Moosehorn WA 0.7 0.3 0.6 0.6

Presidential Range-Dry River WA 1.3 0.8 1.0 1.1

Roosevelt Campobello IP

4.9 2.4 3.5 3.8
Improvement (dv)

0.7% S WS SCR SNCR

0.9 1.5 1.7 1.4

0.7 0.9 1.0

0.6 1.0 0.7 0.7

1.0 1.5 1.3 1.2

3.2 4.0 4.6 4.3