Abstract
Air preheater is an important flue gas heat exchanger in tail flue for coal-fired power plant. In this paper, the operation of air preheater was evaluated from three aspects: the influence of denitrification system on the operation of air preheater, the calculation of air leakage rate of air preheater and the evaluation of low temperature corrosion for air preheater. The results shown that: the corrosion of downstream air preheater caused by ammonium bisulfate was limited due to the low ammonia escape rate; The air leakage rate is higher than the normal value of the air leakage rate; the temperature in the cold end of B-side for air preheater is lower than acid dew point of flue gas due to air leakage, which results in sulphuric acid fog condensation and sulphuric acid corrosion on the air preheater.
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