ASME PTC 4- iNdirect Method: Stack Loss Method

1. q2-flue gas heat loss The exhaust heat loss is the heat loss caused by a part of the heat that is taken away by the smoke of the boiler. Its size is related to the amount of smoke, the smoke exhaust and the reference temperature and the sensible heat of the water vapor in the flue gas. q2 can be used as a simplified calculation formula: q2 = (3.55αpy +0.44) (tpy-t0) / 100

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TYPE OF HEAT LOSS IN BOILER AND THEIR PREVENTION

Seigert Formula for estimation of Dry Flue gas loss % loss = K ( T – t ) % CO2 17 K is a constant whose value are taken as : For anthracite : 0.68 For Bituminous coal : 0.63 For coke : 0.70

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Flue Gas Waste Heat Boiler Thermal Efficiency Calculation

1. ENERGY PERFORMANCE ASSESSMENT OF BOILERS - Bureau of Ene…

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Boiler Efficiency Improvement & Heat Loss Explained in

Calculate the dry flue gas loss (LDG) using the following formula: LDG = [24 x DG x (FGT – CAT)] ÷ HHV, where. DG (lb./lb. fuel) = (11CO 2 + 8O 2 + 7N 2) x (C + 0.375S) ÷ 3CO 2 FGT = flue gas temperature, ºF CAT = combustion air temperature, ºF HHV = higher heating value of fuel, Btu/lb. CO 2 and O 2 = percent by volume in the flue gas N 2 = 100 – CO 2 – O 2

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1. ENERGY PERFORMANCE ASSESSMENT OF BOILERS

Boiler Efficiency Calculation Formula " Boiler efficiency (%) = [Q (H-h)/q*GCV]*100 (heat exported by the fluid (Enthalpy of steam (Kcal/kg) – Enthalpy of water (kcal/kg))/ Gross calorific value of the fuel.) x 100."

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Flue Gas Waste Heat Boiler Thermal Efficiency Calculation

Flue Gas Waste Heat Boiler Thermal Efficiency Calculation

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CHAPTER 3 COMBUSTION CALCULATION

ASME PTC-4 – Indirect Method: Stack Loss Method This method approximates the stack losses of a boiler to estimate boiler efficiency. Parameters The parameters needed to calculate this method are given below. These data are calculated during source testing. 1. Stack temperature (T Stack) 2. Dry oxygen in flue gas (O 2,Dry,%) in percent

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The Heat Balance and Efficiency of Steam Boilers

flue gas loss as follows: LDG, % = [DG x Cp x (FGT - CAT)] x 100 ÷ HHV in which DG is the weight of dry flue gas, lb/lb of fuel,

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Stack Losses – General Methodology

Flue Gas Waste Heat Boiler Thermal Efficiency Calculation

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APPENDIX 1 MEASURING BOILER EFFICIENCY

The ASME formula for wt of dry flue gas is: DG‚ lb/lb fuel‚. 11CO2+ 8O2+ 7(N2+ CO) x [( lb C burned) + 0.375S] 3(CO2+ CO) ( lb fuel ) Step 3: Calculate excess air. The value of excess air is not needed for calculation of stack losses‚ but it is the most common parameter of burner performance.

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03 Related boiler flue gas loss formula information