Airheater Efficiency

Airheater performance can have a great impact on boiler operating economics. Over time efficiency losses can increase as fouling and deposits build inside the airheater or as air leakage develops. ESA has the proper equipment and know-how to conduct an informative assessment of airheater performance and efficiency. Air-in leakage is measured by average flue gas oxygen levels upstream and downstream of the airheater using EPA Methods 1 & 3A. Percent leakage can be calculated either from O2 or CO2 levels. (ESA uses ASME Code 4.3 Section 7.03.1 for Air Heater Efficiency calculation.)

Also of interest is heat transfer performance of the air heater. This is assessed by measuring temperatures at both air inlet and outlet as well as gas inlet and outlet. The graph to the right shows an example of this type of data.

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