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Table 13A
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Combustion Calculations - Btu Method
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INPUT
CONDITIONS - BY TEST OR SPECIFICATION
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FUEL DATA - Coal
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1
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Excess air at economizer exit, % by weight
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15
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Ultimate Analysis
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16
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Theo. Air, lb/100lb fuel
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17
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H20, lb/100 lb fuel
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2
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Entering air temperature, OF
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Constituent
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% by wt.
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K1
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[15] x K1
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K2
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[15] x K2
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3
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Reference air temperature, OF
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A
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C
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4
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Fuel temperature, OF
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B
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S
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5
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Flue gas temp leaving AH (including leakage), OF
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C
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H2
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6
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Flue gas temp leaving AH (excluding leakage), OF
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D
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H2O
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1.00
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7
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Moisture in air, lb/lb dry air
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E
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N2
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8
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Additional moisture lb/100 lb fuel
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F
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O2
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-4.32
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9
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G
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Ash
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10
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H
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Total
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11
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18
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Higher heating value (HHV), Btu/lb fuel
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12
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19
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Unburned carbon loss, % fuel input
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13
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20
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Theoretical air, lb/10,000 Btu
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[16H] x 100 / [18]
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14
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21
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Unburned carbon, % of fuel
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[19] x [18] / 14,500
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COMBUSTION
GAS CALCULATIONS, Quantity / 10,000 Btu Fuel Input
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22
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Theoretical air (corrected), lb/10,000 Btu
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[20] - [21] x 1151 / [18]
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23
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Total Residue from fuel, lb/10,000 Btu
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([15G] + [21]) x 100 / [18]
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24
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A
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At Burners
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B
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Leakage
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C
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Leaving Furnace
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D
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Leaving Air Heater
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25
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Excess air, % by weight
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26
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Dry air, lb/10,000 Btu
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(1 + [25] / 100) x [22]
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27
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H20 from air, lb/10,000 Btu
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[26] x [7]
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28
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Additional Moisture, lb/10,000 Btu
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[8] x 100 / [18]
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29
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H20 from fuel, lb/10,000 Btu
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[17H] x 100 / [18]
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30
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Wet gas from fuel, lb/10,000 Btu
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(100 - [15G] - [21]) x 100 / [18]
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31
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32
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33
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Total wet gas, lb/10,000 Btu
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Summation [26] through [30]
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34
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Water in wet gas, lb/10,000 Btu
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Summation [27] + [28] + [29]
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35
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Dry gas, lb/10,000 Btu
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[33] - [34]
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36
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H20 in gas, % by weight
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[100] x [34] / [33]
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37
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Residue, % by weight
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100 x [24] / [33]
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EFFICIENCY
CALCULATIONS, % Input from Fuel
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Losses
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38
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Dry Gas, %
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0.0024 x [35D] x ([6] - [3])
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39
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Water from
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Enthalpy of steam at 1 psi, T = [6]
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H1 =
(3.958E-5 x T + .4329) x T + 1062.2
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40
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Fuel,
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Enthalpy of water at T = [3]
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H2 = [3] -
32
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41
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as-fired %
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[29] x ([39] - [40]) / 100
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42
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Moisture in air, %
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0.0045 x [27D] x ([6] - [3])
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43
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Unburned carbon, %
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[19] or [21] x 14,500 / [18]
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44
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Radiation and convection, %
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ABMA curve
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45
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Unaccounted for and manufacturers margin, %
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46
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47
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Summation of losses, %
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Summation [38] + [46]
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Credits
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48
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Heat in dry air, %
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.0024 x [26D] x ([2] - [3])
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49
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Heat in moisture in air, %
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.0045 x [27D] x ([2] - [3])
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50
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Sensible heat in fuel, %
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(H at T[4] - H at T[3]) x 100 / [18]
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0.00
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51
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Other, %
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0.00
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52
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Summation of credits, %
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Summation [48] through [51]
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53
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Efficiency, %
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100 - [47] + [52]
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