Investigation of Exhaust Gas Temperature Correction Methods for the Change of Air Inlet Temperature

摘要

The exhaust gas temperature correction for the change of air inlet temperature is the most significant correction for boiler performance test. However, in ASME and China GB standard, the regulations of the correction formulas are different, which brings about some misunderstanding in actual use. In this paper, the correction formulas are derived and analyzed. What's more, the application conditions are summed up and described as follows. Firstly, the top and side of the air heater must be in good sealing ability, for which the air leakage can be ignored. Secondly, the air inlet temperature must be taken from the entrance of the air heater, but not from that of the forced draft fan. Finally, the air leakage of the air heater must stay the same before and after the correction. On this basis, a correction method is conducted, which takes the cold air temperature at the entrance of the forced draft fan as the air inlet temperature and can be applied under different air leakage ratios conditions. With the same form as the traditional one, the method mentioned above is easy to understand and has a positive meaning in handling such problems.