8/18/2019 Calc Boiler Efficiency

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  100%    

   

    51.04     %   A    

      3.64     %   A   %  

    0.2     %      

      12.74     %    

      0.66     %     (% )   4.26   %  

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  ()     %  

    ()     %  

(%) (%)     %  

  A 20 0.26 

A 5 0.26  ffi  

A A 0 0.00    %  

A 75 0.26    %  

A 0 0.00    %  

A 0 0.00    %  

A

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c 1 - Boiler Efficiency.xls http://www.exoeng.com/boilereffcalc.htm

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8/18/2019 Calc Boiler Efficiency

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Table 13A

  Steam Load: 0 pph Combustion Calculations - Btu Method  

Client:   Plant:   Location:   Date: 01/00/00

  INPUT CONDITIONS - BY TEST OR SPECIFICATION   FUEL DATA - Coal   

1 Excess air at economizer exit, % by weight 15.56   15 Ultimate An 16 Theo. Air, lb/100lb fuel 17 H20, lb/100 lb fuel

  2 Entering air temperature,OF 60   Co % by wt. K1 [15] x K1 K2 [15] x K2

  3 Reference air temperature,OF 80 A C 51.04   11.51 587.37  

4 Fuel temperature, OF 60 B S 0.29   4.31 1.25  

5 Flue gas temp leaving AH (including leakage), OF 321 C H2   3.64   34.28 124.79   8.94 32.53

  6 Flue gas temp leaving AH (excluding leakage),OF 349 D H2O   26.57   1.00 26.57

  7 Moisture in air, lb/lb dry air 0.0135 EN

2   0.66  

8 Additional moisture lb/100 lb fuel 0.0000 F O2   12.74   -4.32 -55.04  

9 G Ash 5.06  

10 H Total 100.00   658.37   59.10

  11 18Higher heating value (HHV), Btu/lb fuel 8,867

  12 19 Unburned carbon loss, % fuel input 0.02

  13 20 Theoretical air, lb/10,000 Btu [16H] x 100 / [18] 7.42

  14 21 Unburned carbon, % of fuel [19] x [18] / 14,500 0.01

  COMBUSTION GAS CALCULATIONS, Quantity / 10,000 Btu Fuel Input

22 Theoretical air (corrected), lb/10,000 Btu [20] - [21] x 1151 / [18] 7.42

  23 Total Residue from fuel, lb/10,000 Btu ([15G] + [21]) x 100 / [18] 0.06

  24

A At B Leakage C Leaving Furnace D Leaving Air Heater

  25 Excess air, % by weight 15.55921  13.826   15.56   29.39

  26 Dry air, lb/10,000 Btu (1 + [25] / 100) x [22] 8.58   9.60

  27 H20 from air, lb/10,000 Btu [26] x [7] 0.12 0.12   0.13 0.13

  28 Additional Moisture, lb/10,000 Btu [8] x 100 / [18] 0.00 0.00   0.00 0.00

  29 H20 from fuel, lb/10,000 Btu [17H] x 100 / [18] 0.67   0.67

  30 Wet gas from fuel, lb/10,000 Btu (100 - [15G] - [21]) x 100 / [18] 1.07   1.07

  31

32

33 Total wet gas, lb/10,000 Btu Summation [26] through [30] 10.43   11.47

  34 Water in wet gas, lb/10,000 Btu Summation [27] + [28] + [29] 0.78 0.78   0.80 0.80  35 Dry gas, lb/10,000 Btu [33] - [34] 9.65   10.68

  36 H20 in gas, % by weight [100] x [34] / [33] 7.50   6.94

  37 Residue, % by weight 100 x [24] / [33] 0.55   0.50

  EFFICIENCY CALCULATIONS, % Input from Fuel

Losses  

38 Dry Gas, % 0.0024 x [35D] x ([6] - [3]) 6.17

  39Water from

fuel, as-fired

%

Enthalpy of steam at 1 psi, T = [6] H1 = (3.958E-5 x T + .4329) x T + 1062.2   1,205.24  

40 Enthalpy of water at T = [3] H2 = [3] - 32   48.00  

41 [29] x ([39] - [40]) / 100 7.71

  42 Moisture in air, % 0.0045 x [27D] x ([6] - [3]) 0.14

  43 Unburned carbon, % [19] or [21] x 14,500 / [18] 0.02

  44 Radiation and convection, % ABMA curve 0.17

  45 Unaccounted for and manufacturers margin, % 0.50

  46

47 Summation of losses, % Summation [38] + [46] 14.72

  Credits  

48 Heat in dry air, % .0024 x [26D] x ([2] - [3]) -0.461019

  49 Heat in moisture in air, % .0045 x [27D] x ([2] - [3]) -0.011670

  50 Sensible heat in fuel, % (H at T[4] - H at T[3]) x 100 / [18] 0.000000

  51 Other, % 0.000000

  52 Summation of credits, % Summation [48] through [51] -0.47

  53 Efficiency, %   100 - [47] + [52] 84.81

c 1 - Boiler Efficiency.xls http://www.exoeng.com/boilereffcalc.htm

3 9/16/2014 4:19 PM

8/18/2019 Calc Boiler Efficiency

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Table 13A

  Steam Load: 0 pph Combustion Calculations - Btu Method  

Client:   Plant:   Location:   Date: 01/00/00

  INPUT CONDITIONS - BY TEST OR SPECIFICATION   FUEL DATA - Coal   

1 Excess air at economizer exit, % by weight 15.56   15 Ultimate An 16 Theo. Air, lb/100lb fuel 17 H20, lb/100 lb fuel

  2 Entering air temperature,OF 60   Co % by wt. K1 [15] x K1 K2 [15] x K2

  3 Reference air temperature,OF 80 A C 51.04   11.51 587.37  

4 Fuel temperature, OF 60 B S 0.29   4.31 1.25  

5 Flue gas temp leaving AH (including leakage), OF 238 C H2   3.64   34.28 124.79   8.94 32.53

  6 Flue gas temp leaving AH (excluding leakage),OF 349 D H2O   26.57   1.00 26.57

  7 Moisture in air, lb/lb dry air 0.0135 EN

2   0.66  

8 Additional moisture lb/100 lb fuel 0.0000 F O2   12.74   -4.32 -55.04  

9 G Ash 5.06  

10 H Total 100.00   658.37   59.10

  11 18Higher heating value (HHV), Btu/lb fuel 8,867

  12 19 Unburned carbon loss, % fuel input 0.02

  13 20 Theoretical air, lb/10,000 Btu [16H] x 100 / [18] 7.42

  14 21 Unburned carbon, % of fuel [19] x [18] / 14,500 0.01

  COMBUSTION GAS CALCULATIONS, Quantity / 10,000 Btu Fuel Input

22 Theoretical air (corrected), lb/10,000 Btu [20] - [21] x 1151 / [18] 7.42

  23 Total Residue from fuel, lb/10,000 Btu ([15G] + [21]) x 100 / [18] 0.06

  24

A At B Leakage C Leaving Furnace D Leaving Air Heater

  25 Excess air, % by weight 15.55921  81.174   15.56   96.73

  26 Dry air, lb/10,000 Btu (1 + [25] / 100) x [22] 8.58   14.60

  27 H20 from air, lb/10,000 Btu [26] x [7] 0.12 0.12   0.20 0.20

  28 Additional Moisture, lb/10,000 Btu [8] x 100 / [18] 0.00 0.00   0.00 0.00

  29 H20 from fuel, lb/10,000 Btu [17H] x 100 / [18] 0.67   0.67

  30 Wet gas from fuel, lb/10,000 Btu (100 - [15G] - [21]) x 100 / [18] 1.07   1.07

  31

32

33 Total wet gas, lb/10,000 Btu Summation [26] through [30] 10.43   16.54

  34 Water in wet gas, lb/10,000 Btu Summation [27] + [28] + [29] 0.78 0.78   0.86 0.86  35 Dry gas, lb/10,000 Btu [33] - [34] 9.65   15.67

  36 H20 in gas, % by weight [100] x [34] / [33] 7.50   5.22

  37 Residue, % by weight 100 x [24] / [33] 0.55   0.35

  EFFICIENCY CALCULATIONS, % Input from Fuel

Losses  

38 Dry Gas, % 0.0024 x [35D] x ([6] - [3]) 5.93

  39Water from

fuel, as-fired

%

Enthalpy of steam at 1 psi, T = [6] H1 = (3.958E-5 x T + .4329) x T + 1062.2   1,167.36  

40 Enthalpy of water at T = [3] H2 = [3] - 32   48.00  

41 [29] x ([39] - [40]) / 100 7.46

  42 Moisture in air, % 0.0045 x [27D] x ([6] - [3]) 0.14

  43 Unburned carbon, % [19] or [21] x 14,500 / [18] 0.02

  44 Radiation and convection, % ABMA curve 0.17

  45 Unaccounted for and manufacturers margin, % 0.50

  46

47 Summation of losses, % Summation [38] + [46] 14.23

  Credits  

48 Heat in dry air, % .0024 x [26D] x ([2] - [3]) -0.70

  49 Heat in moisture in air, % .0045 x [27D] x ([2] - [3]) -0.02

  50 Sensible heat in fuel, % (H at T[4] - H at T[3]) x 100 / [18] 0.00

  51 Other, % 0.00

  52 Summation of credits, % Summation [48] through [51] -0.72

  53 Efficiency, %   100 - [47] + [52] 85.05

c 1 - Boiler Efficiency.xls http://www.exoeng.com/boilereffcalc.htm

3 9/16/2014 4:19 PM