Energy Saving H Double Finned Tube Economiser Coil Module ASME - Standard
Condensing Economizer Description
1. The condensing economizer improves waste heat recovery by cooling the flue gas below its dew point, which is about 135°F for products of combustion of natural gas.
2. The economizer reclaims both sensible heat from the flue gas and latent heat by condensing flue gas water vapor . All hydrocarbon fuels release significant quantities of water vapor as a combustion byproduct.
3. The equation below shows the reactants and combustion products for the stoichiometric combustion in air of methane (CH4), the primary constituent of natural gas. When one molecule of methane is burned, it produces two molecules of water vapor.
4. When moles are converted to pound/mole, we find that every pound of methane fuel combusted produces 2.25 lb. of water vapor, which is about 12%of the total exhaust by weight.
Economizer Types
Economizer
(HOT WATER BOILERS)
Fuel type (gas, oil or dual fuel)
Temperatures, inlet (exhaust gas and water)
Desired temperature, outlet (exhaust gas)
Flow temperature, boiler
Design pressure, boiler
Economizer
(STEAM BOILERS)
Fuel type (gas, oil or dual fuel)
Temperature, inlet (flue gas and water)
Desired temperatures, outlet (flue gas and water)
Design pressure
Feed water preheater
Fuel type (gas, oil or dual fuel)
Temperature, feed water
Required temperature, outlet (flue gas)
Boiler pressure
Steam volume
Condensing Economizer
| System | Combustion Efficiency @4%Excess O2(%) | Stack Gas Temperature F |
| Boiler | 78 to 83% | 350 to 550 |
| With Feedwater Economizer | 84 to 86% | 250 to 300 |
| With FW and Condensing Economizer | 92 to 95% | 75 to 150 |
Detailed Picture
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Energy Saving H Double Finned Tube Economiser Coil Module ASME - Standard Images
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