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What are the differences ?
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Today energy cost is sky high and everybody chasing to find new source of energy. Nevertheless, less people would put much attention in increasing efficiency. Efficiency us understood as what you get compare to what you put in. Nevertheless in many events, there are confusion in defining efficiency. There are several "efficiency" terms used in boiler i.e. combustion efficiency, thermal efficiency, fuel-to-steam efficiency, boiler efficiency, etc.
What are the differences ?
"Combustion efficiency" is burner’s ability to burn fuel where it measure amount of unburned fuel and excess air in the exhaust compare to fuel being fed to the burner. It is often used to evaluate burner’s performance. Combustion efficiency is generally higher for gaseous and liquid fuels follow by solid fuels. A well designed burner generally firing gaseous and liquid fuels at excess air levels of 15%.
"Thermal efficiency" is fuel-to-heat efficiency which does not take in account of radiation and convection losses.
“Boiler efficiency” in many events is understood as thermal efficiency or fuel-to-steam efficiency. Infact thermal efficiency is different than fuel-to-steam efficiency. Fuel-to-steam efficiency does take in to account of radiation and convection losses. It is a overall boiler efficiency from quantity of fuel consumed to quantity of steam generated.
Above definitions would lead to confusion of some engineers during selection of boiler. Thus, proper communication and definition of efficiency given by a particular boiler vendor is very important.
Facts About Firetube Boilers & Boiler Efficiency
This is an Efficiency Facts Booklet is designed to clearly define boiler efficiency. It will also give you the background in efficiency needed to ask the key questions when evaluating efficiency data, and provide you with the tools necessary to accurately compare fuel usage of boiler products, specifically firetube type boilers.
In this booklet, you may find :
- Several key factors to understanding efficiency i.e. Flue gas temperature, Stack temperature, Fuel specification, Excess air, Ambient air temperature and Radiation and convection losses.
- Fuel-to-Steam Efficiency versus Flue Gas Temperature Curve
- Efficiency versus H-C ratio
- Efficiency versus O2 concentration
- Efficiency versus Ambient Temperature
- Fuel cost comparison for boiler with different efficiency
- Efficiency estimation based on Stack temperature
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