technologist | 01 Aug, 2007, 20:58 |
General | (1346 Reads)
How much is the typical coal fired boiler efficiency?
Probably the best operating boiler can achieve ~80% or +/-2%.
Historically, boiler efficiency has been limited due to the minimum temperature allowed for the auxiliary equipment. Heat lost up the stack was in exchange for keeping the flue gas temperature above the water vapor dew point to protect the air heater or economizer from acid corrosion. If water vapor was allowed to condense out, rapid deterioration, due to acid corrosion, of the outlet duct and stack would also occur.
The contribution of dry flue gas is ~9-12% & ~5-8% due to presence of humidity & water in combustion products. The reason is that the flue gas temperature (generally 170 - 200°C) is limited by dew point to avoid condensation of downstream exchangers.
With the development of CHX™ condensing heat exchangers, boiler efficiency can now approach 90%. Approximately 1% gain in boiler efficiency can be expected for every 20° C reduction in flue gas stack temperature. Therefore if we can lower it to ~90°C or so, we can practically recover more heat with total thermal efficiency increase from 80% to ~88% or so.
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