Murphy Company CAO Additional Calculations 2.5.2026.XLSX
Dioxins and Furans
Mlb to MMBtu Conversion
Welding Data
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1Murphy Company
2Source Number: 150014
3Additional Calculations
4Dioxins and Furans
5CalculationsExplaination
6Heat Input to OD tons/year Conversion Screenshot of the page from the technical bulletin that was used. The values from the table are outlined in RED.
7OD - Oven Dried Wood One of the conversion factors are sourced from the note under Table 4.6 in NCASI Technical Bulletin 1013. In the note under Table 4.6, 8,400 Btu/lb was used in NCASI's calculations. To follow suit, the 8,400 Btu/lb value is used in the calculations to support the derviation of the TEQ emission factor. IsomerWHO TEFug/OD ton woodμg/yrμg TEQ/yr
8CDD IsomerTEFMean Mean
9Conversion Factors 2,3,7,8-TCDD10.005=$D$27*L9=M9*K9
108400Btu/lb 1,2,3,7,8-PeCDD10.011=$D$27*L10=M10*K10
112000lb/ton1,2,3,4,7,8-HxCDD0.10.007=$D$27*L11=M11*K11
121,2,3,6,7,8-HxCDD0.10.017=$D$27*L12=M12*K12
13Btu Calculation 1,2,3,7,8,9-HxCDD0.10.017=$D$27*L13=M13*K13
141,2,3,4,6,7,8-HpCDD0.010.075=$D$27*L14=M14*K14
158400 x 2000 ==A10*A11Btu To find MMBtu, you must first multiply the given 8,400 Btu/lb value from NCASI TB No. 1013, and multiply by 2,000 lbs per ton. Next, take the product (in Btu), and divide by 1,000,000. This will result in the units of MMBtu. 1,2,3,4,6,7,8,9-OCDD0.00030.19=$D$27*L15=M15*K15
16μg/yrμg TEQ/yr
17=D15==B17/B18MMBtuCDF IsomerTEFMean Mean
1810000002,3,7,8-TCDF0.10.063=$D$27*L18=M18*K18
191,2,3,7,8-PeCDF0.030.031=$D$27*L19=M19*K19
201 OD ton wood = 16.8 MMBtu of heat input (assuming 8,400 Btu/lb)2,3,4,7,8-PeCDF0.30.043=$D$27*L20=M20*K20
21From the previous calculations, you now have 16.8 MMBtu per 1 OD ton wood. 1,2,3,4,7,8-HxCDF0.10.028=$D$27*L21=M21*K21
22Heat Input 1,2,3,6,7,8-HxCDF0.10.024=$D$27*L22=M22*K22
23386692MMBtu/year 1,2,3,7,8,9-HxCDF0.10.005=$D$27*L23=M23*K23
242,3,4,6,7,8-HxCDF0.10.02=$D$27*L24=M24*K24
25Conversion of Heat input to OD tons/year 1,2,3,4,6,7,8-HpCDF0.010.044=$D$27*L25=M25*K25
26To convert heat input to OD tons/year, the heat input value of 289,978 is divided by the calculated 16.8 MMBtu per 1 OD ton wood1,2,3,4,7,8,9-HpCDF0.010.007=$D$27*L26=M26*K26
27=B23==B27/B28OD tons/year 1,2,3,4,6,7,8,9-OCDF0.00030.039=$D$27*L27=M27*K27
28=D17Total: =SUM(M9:M27)=SUM(N9:N27)
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31Caclulation explaination using Table 4.6 from NCASI Technical Bulletin No. 2013
32Emission Factor Calculation NCASI Technical Bulletin No. 1013 was utilized to determine the emission factor for TEQ.
33In Table 4.6 from NCASI TB No. 1013, the mean values were used to calculate µg/yr, then coverted to g/yr, then coverted again to reach µg TEQ/yr.
34Conversion:
351 lb =453592370μg
36For example purposes, 2,3,7,8-TCDD will be used.
37Step 1: Convert ug to lb To calculate ug/yr, the mean value of 2,3,7,8-TCDD is multiplied by the amount of oven dried tons per year.
38Now, using the calculations completed based on Table 4.6 in NCASI TB No. 1013, you will need to take the sum of ug TEQ/yr (Cell N25 in this worksheet) and divide by the amount of ug in 1 pound.
39=N28==B39/B40lb/yearug/yr = 0.005 (ug/OD ton wood) x 17,260.6 (OD tons/yr)
40=D35Formula in the cell: =L6 *$D$24
41ug/yr = 86.30298 ug/yr
42Step 2: Divide by Heat Input
43Now that you have lb/year, you will need to convert that to lb/MMBtu. To do so, you take the 1.87x10-6 lb/year value and divide by the heat input of 289,978 MMBtu/year. The quotient produced from this equation is the TEQ emission factor that is used in the emissions inventory. To calculate ug TEQ/yr, the ug/yr value is multiplied by the 2005 WHO TEF value.
44ug TEQ/yr = 86.30298 (ug/yr) x 1 (WHO TEF)
45=D39==B45/B46lb/MMBtuFormula in the cell: =M6 *K6
46=B23ug TEQ/yr = 86.302979
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1Murphy Company
2Source Number: 150014
3Additional Calculations
4Mlb-steam to MMBtu Conversion
5
61 Mlb = 1,000 lb To convert annual steam production to annual fuel heat input, the steam output was first expressed in pounds by converting 243,509 Mlb/yr to 243,509,000 lb/yr. Using saturated steam properties at approximately 150 psig, the total enthalpy of steam (hg) is about 1,196 Btu/lb, based on standard saturated steam tables. Referencing steam generation from cold water - a common plant convention - yields an enthalpy rise of roughly 1,190 Btu/lb. Because the wood-waste boilers like the Wellons unit typically operate at about 75% combustion efficiency, the required fuel heat input per pound of steam is calculated by dividing the enthalpy rise by this efficiency, giving approximately 1,587 Btu/lb of steam produced. This converts to 1.587 MMBtu per Mlb of steam. Multiplying this factor by the annual steam production of 243,509 Mlb/yr results in an annual fuel heat input of about 386,692 MMBtu/yr.
7
8243509Mlb/yr
9=A8*1000lb/yr
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11Assumptions:
12Steam condition: saturated ~ 150 psig --> hg~ 1196 Btu/lb (steam tables)
13Reference enthalpy basis: cold water (plant convention)
14Biomass boiler efficiency: 75%
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16Derivation:
17Enthalpy rise (cold to steam) ~ 1190 Btu/lb
18Fuel heat input per lb steam =
191190 Btu/lb / 0.75
20=1190/0.75Btu/lb
21=B20/1000MMBtu/Mlb
22
23243,509 Mlb/yr x 1.587 MMBtu/Mlb
24
25 = =243509*1.588MMBtu/yr
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ABCDEFGHIJKLMNOPQRSTUVWXYZAAABACADAEAFAGAHAIAJ
1Murphy Company
2Source Number: 150014
3Additional Calculations
4Welding
5SMAW = shielded metal arc welding
6GMAW = gas metal arc weldingEmissions CalculationsCalculations Explained
7
8AP-42, Table 12.19-2 HAP Emission Factors for Welding OperationsThroughput AP-42 Emission Factors (EF) used to calculate Emissions (lb/yr)
9HAP Emission Factor (10-1 g/kg [10-1 lb/103 lb] Of Electrode Consumed)
10Welding Process Electrode Type CrCr(VI)CoMnNiPbWelding Process Electrode Type Throughput UnitsExempt? Conversion Factors E7018Throughput (lb/yr)==N11It is important to note here that E7018 is NOT EXEMPT due to the throughput exceeding the listed threshold of 50 pounds per year in Appendix B of the CAO Exempt TEU Reporting Guidance Document. E7018 is inlcuded in the AQ520 form.
11SMAWE70180.06ND<0.0110.30.02NDSMAWE7018100lb/yrNo10-1 g/kg to g/kg0.1PollutantGiven EF ConversionEmissions
12GMAWE70S0.01ND<00.13.180.01NDGMAWE70S66lb/yrYes1g = 0.00220462lb(10-1 g/kg) g/kglb/lb(lb/yr)
13FCAWE30910lb/yrYes1kg =2.20462lbCr0.06=Z13*$W$11=AA13*($V$12/$V$13)=AB13*$AC$10
14Cr(VI)NDNDNDND
15San Diego Air Pollution Contrl Division (SDAPCD) Emission Factors Co0.01=Z15*$W$11=AA15*($V$12/$V$13)=AB15*$AC$10
16F106 - 309 Self-Shielded, Flux Core Arc Welding (FCAW) Welding Process Emission Factors Mn10.3=Z16*$W$11=AA16*($V$12/$V$13)=AB16*$AC$10
17District Emission Factors (lbs/lb rod) Ni0.02=Z17*$W$11=AA17*($V$12/$V$13)=AB17*$AC$10The emission factors in AP-42 were given in units of 10-1 g/kg. First, to convert to g/kg, you must multiply the emission factor by 0.1. The next step would be to covert g/kg to lb/lb. To do so, you multiply the g/kg value by the the quotient of 0.0022 divided by 2.20462. You now result in the units of lb/lb. Next, you apply the throughput. You multiply the lb/lb value by the throughput to reach emissions in pounds per year. Emissions in lb/yr are bolded in the table.
18Pollutant CdCrCr(VI)CuMnNiPPbPbNDNDNDND
19Emission Factor7.1E-060.0002070.000166E-050.004210.005751.72E-056.45E-05
20E70SThroughput (lb/yr)==N12
21PollutantGiven EF Conversion Emissions
22(10-1 g/kg) g/kglb/lb(lb/yr)
23This is the table that was used for the calculations for E7018 and E70SAppendix B of the TEU Exempt Reporting Document. Outlined in RED are the applicable welding types that were utilized for purposes of exemption. Cr0.01=Z23*$W$11=AA23*($V$12/$V$13)=AB23*$AC$20
24Cr(VI)NDNDNDND
25Co0.01=Z25*$W$11=AA25*($V$12/$V$13)=AB25*$AC$20
26Mn3.18=Z26*$W$11=AA26*($V$12/$V$13)=AB26*$AC$20
27Ni0.01=Z27*$W$11=AA27*($V$12/$V$13)=AB27*$AC$20
28PbNDNDNDND
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31SDAPCD Emissions Calculations
32E309
33Throughput (lb/yr)==N13
34PollutantEFEmissionsFor the calculations using the SDAPCD emission factors, it is much simplier. Once you have the given emission factor, you apply the throughput. Multiply the emission factor by the throughput to reach emissions in pounds per year.
35(lb/lb rod)(lb/yr)
36Cd7.1E-06=Z36*$AA$33
37Cr0.000207=Z37*$AA$33
38Cr(VI)0.00016=Z38*$AA$33
39Cu6E-05=Z39*$AA$33
40Mn0.00421=Z40*$AA$33
41Ni0.00575=Z41*$AA$33
42P1.72E-05=Z42*$AA$33
43Pb6.45E-05=Z43*$AA$33
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50This is the table from SDAPCD that was used for calculations for E309
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