Name: Ms. Misty Hanson

Title: Environmental Compliance Specialist

Company: Minnesota Power

Sign Date:

Name: Mr. James Tryba

Title: North Service Manager

Company: GE International, Inc.

Sign Date: 5/3/2010

Permitted Facility Representative / Date Testing Company Representative / Date

Boswell Energy Center

Final Test Report 

for

/ /

Based on information and belief formed 

after reasonable inquiry, I certify that the 

statements and information in this test 

report are true, accurate, and complete.

I have reviewed all testing details and 

results in this test report and hereby 

certify that the test report is authentic 

and accurate.

Tuesday, February 08, 2011 Page 1 of 7
Boswell Energy Center

Facility Information:

Minnesota Power Clay Boswell Energy

1210 NW 3rd Street

Cohasset MN 55721

Contact: Misty Hanson

Phone: 218-313-5446

Fax: 218-3313-4695

Email: mhanson@mnpower.com

Testing Company:

GE International, Inc.

1301 Corporate Center Drive

Suite 177

Eagan MN 55121

Contact:James Tryba

Phone: 651-686-0700

Fax: 651-686-4434

Email: james.tryba@ge.com

Air Permit Number:

1893

Permitted Source ID/Name:

3 3

Permitted Maximum Process Rate:

3355 mmBtu per hour max design capa

Max. Normal Operation Process Rate:

4115 mmBtu per hour

Target Process Test Rate

4115 mmBtu per hour

Description of the source (including control equipment). Please see the attachments for source or

 process flow diagram:

Boswell Energy Center Unit 3 is a 385GMW coal fired electric utility steam generating boiler. The main fuel is sub 

bituminous coal. The unit is permitted to also burn natural gas through igniters, propane, distillate oil, limited 

amounts of boiler cleaning agents, used oil, oily coal, oily paper based floor dry, wastewater treatment plant sludge, 

and oily materials.

The following describes any modifications and/or deviations to the applicable test 

methods. If alternative methods were requested, see the attachments for documentation 

of request AND approval, including dates.

Industry/SCC/NAIS 22

Sampling Location Information:

Test Parameter Information:

AFS #: 2706100004 FRS #: 110037369638

SCC / Description 10100226 External Combustion Boilers - Electric Generation - Bituminous/Subbituminous 

Coal - Pulverized Coal: Dry Bottom Tangential (Subbituminous Coal) 

The following state and federal regulations that apply to the proposed testing:

Location

Round

Duct

Diam.

Distance from 

upstream dist.

Distance from

downstream dist.

Number of

Traverse Ports

Equiv. 

Diam

Min.Travers 

Points

Rect. Duct 

Length /Width

Unit 3 0 300 180 348 360 168 8 24

Target

Parameter 

Test

Method

Number of

Test Runs

Test Run

Duration

Sample 

Location Points Comments

Unit 3 Hydrogen Chloride Method 26A 3 180 0

Unit 3 Hydrogen Fluoride Method 26A 3 180 0

Regulation Description Compound Limit Unit

None 0

Tuesday, February 08, 2011 Page 2 of 7
The following describes any modifications and/or deviations to the applicable test Boswell Energy Center

methods. If alternative methods were requested, see the attachments for documentation 

of request AND approval, including dates.

The hydrogen cyanide (HCN) testing was accidentally overlooked and therefore not performed during this 

information collection test program. The attached file is email coorespondance regarding the issue, and excusing the 

HCN data requirement for this site.

Tuesday, February 08, 2011 Page 3 of 7
Boswell Energy Center

Sampling / Stack Data Results Summary

Location Unit 3 - Method 26A

Average

Run Number 1 2 3

Test Date 3/31/2010 3/31/2010 3/31/2010

Run Start Time 6:11:00 AM 10:40:00 

AM

2:40:00 PM

Run Finish Time 9:54:30 AM 2:10:30 PM 5:59:30 PM

Net Run Time, minutes 180 180 180

Dry Gas Meter Volume Sampled, dscf 92.106 93.574 91.154 92.278

Moisture Content of Stack Gas, % 15.11 15.91 15.72 15.580

Moisture Saturation at Stack Gas Temperature, % 15.45 15.53 15.52 15.500

Carbon Dioxide, % 13.5 13.4 13.5 13.467

Oxygen, % 6.2 6.3 6.2 6.233

Average Stack Gas Temperature, °F 128.00 128.38 128.46 128.280

Dry Volumetric Flow Rate, dry scfm 919,243.7 935,378.5 910,513.5 921,711.900

Actual Wet Volumetric Flue Gas Flow Rate, acfm 1,301,625.0 1,325,700.0 1,286,325.0 1,304,550.00

0

Percent Isokinetic of Sampling Rate, % 97.6 97.5 97.5 97.533

F-Factor, dscfm/MMBtu @ %O2 9820 9820 9820 9,820.000

Fw 0 0 0 0.000

Fc 1840 1840 1840 1,840.000

Tuesday, February 08, 2011 Page 4 of 7
Boswell Energy Center

Emissions Summary

Process Run Data

Location: Unit 3 - Method 26A

Compound: Filterable Particulate

Average

RunNumber 1

Mass_mg 0 0.000

lb/mmBtuO2 0.00E+00 0.000

Compound: Hydrogen Chloride

Average

RunNumber 1 2 3

Mass_mg 1.6 1.5 1.5 1.533

lb/mmBtuO2 5.35E-04 4.97E-04 5.07E-04 0.001

Compound: Hydrogen Fluoride

Average

RunNumber 1 2 3

Mass_mg 340 0.31 0.32 113.543

lb/mmBtuO2 1.14E-01 1.03E-04 1.08E-04 0.038

Tuesday, February 08, 2011 Page 5 of 7
Boswell Energy Center

Process Run Data

APCD Run Data

Process Lab Run Data

Run Name Value UOM Comments

Target

Value

1 Heat Input 3716 Million Btus/hr

2 Heat Input 3706 Million Btus/hr

3 Heat Input 3734 Million Btus/hr

1 Gross Megawatts 381 MW 0

2 Gross Megawatts 380 MW 0

3 Gross Megawatts 381 MW 0

1 Steam 2052 1000 lb/hr 0

2 Steam 2043 1000 lb/hr 0

3 Steam 2037 1000 lb/hr 0

1 Limestone slurry feed 19571 lb/hr 0

2 Limestone slurry feed 20453 lb/hr 0

3 Limestone slurry feed 20272 lb/hr 0

Run Name Value UOM Comments

Target

Value

1 LOW NOX BURNERS 0 0

1 OVERFIRE AIR 0 0

1 SCR (SELECTIVE CATALYTIC REDUCTION) 0 0

1 WET SCRUBBER 0 0

1 BAGHOUSE 0 0

Run Name Value UOM Comments

1 None 0

Tuesday, February 08, 2011 Page 6 of 7
Boswell Energy Center

Sampling / Stack Data Results Detail

Location Unit 3 - Method 26A

Average

Run Number 1 2 3

Test Date 3/31/2010 3/31/2010 3/31/2010

Run Start Time 6:11:00 AM 10:40:00 AM 2:40:00 PM

Run Finish Time 9:54:30 AM 2:10:30 PM 5:59:30 PM

Net Traversing Points 24 24 24

Net Run Time, minutes 180 180 180

Nozzle Diameter, inches 0.198 0.198 0.198 0.198

Pitot Tube Coefficient 0.84 0.84 0.84 0.840

Dry Gas Meter Calibration Factor 1.007 1.007 1.007 1.007

Barometric Pressure, inches of Mercury 27.75 27.87 27.96 27.860

Average Orifice Meter Differential, inches H2O 0.98 1.02 0.97 0.990

Dry Gas Meter Volume Sampled, cubic feet 102.942 103.797 100.984 102.574

Average Dry Gas Meter Temperature, °F 92.58 90.85 91.85 91.760

Dry Gas Meter Volume Sampled, dscf 92.106 93.574 91.154 92.278

Total Moisture Liquid collected, g 348.3 376 361.1 361.800

Volume of Water Vapor, standard cubic feet 16.39 17.70 17.00 17.030

Moisture Content of Stack Gas, % 15.11 15.91 15.72 15.580

Moisture Saturation at Stack Gas Temperature, % 15.45 15.53 15.52 15.500

Dry Mole Fraction 0.8489 0.8447 0.8448 0.846

Carbon Dioxide, % 13.5 13.4 13.5 13.467

Oxygen, % 6.2 6.3 6.2 6.233

Carbon Monoxide & Nitrogen, % 80.3 80.3 80.3 80.300

Fuel Factor 1.09 1.09 1.09

Dry Molecular Weight, lb/lb-Mole 30.41 30.40 30.41 30.407

Wet Molecular weight, lb/lb-Mole 28.53 28.54 28.52 28.530

Flue Gas Static Pressure, inches of H2O -0.4 -0.25 -0.3 -0.317

Absolute Flue Gas Pressure, inches of Mercury 27.72 27.85 27.94 27.837

Average Stack Gas Temperature, °F 128.00 128.38 128.46 128.280

Average Velocity Head, inches of H2O 0.8727033636

75699

0.909400115

880909

0.858314128

444905

0.880

Average Stack Gas Velocity, feet/second 57.85 58.92 57.17 57.980

Stack Cross-Sectional Area, square feet 375.000 375.000 375.000 375.000

Dry Volumetric Flow Rate, dry scfm 919,243.7 935,378.5 910,513.5 921,711.900

Actual Wet Volumetric Flue Gas Flow Rate, acfm 1,301,625.0 1,325,700.0 1,286,325.0 1,304,550.0

00

Percent Isokinetic of Sampling Rate, % 97.6 97.5 97.5 97.533

Percent Excess Air, % 41.3 42.3 41.3 41.633

F-Factor, dscfm/MMBtu @ %O2 9820 9820 9820 9,820.000

Round Duct Diameter, inches 0 0 0

Rectangular Duct Width, inches 180 180 180

Rectangular Duct Length, inches 300 300 300

Fw 0 0 0 0.000

Fc 1840 1840 1840 1,840.000

Tuesday, February 08, 2011 Page 7 of 7