Boiler Efficiency

Various methods exist to measure or calculate boiler efficiency. ESA typically uses the BTU Method, which provides accurate results but requires a considerable amount of manually gathered information. To perform this calculation ESA collects the following operating data:

• economizer outlet flue gas analysis (O2, CO2, NOx, CO)
• ultimate coal analysis
• bottom ash carbon
• flyash loading
• flyash carbon
• airheater outlet oxygen
• airheater outlet gas temperature
• airheater inlet air temperature
• radiation losses (assumed)
• unmeasured losses (assumed)

This information is used to first calculate detailed molar flue gas composistion, combustion stoichiometry, flue gas and combustible losses heat losses and finally boiler efficiency.

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