Abstract:

To analyze the economy of power plants，performance test for a waste heat boiler in a gassteam combined cycle unit was made, and the field test data were taken to calculate the thermal efficiency of the waste heat boiler within positive and counter balance mathematical models.In the extreme situations with unknown leakage in the system, variation trends of the efficiency calculated in two models were studied. The study results showed that the counterbalance waste heat boiler thermal efficiency ranged from  85.69% to 85.92% under the rated conditions, and the efficiency calculated by positive balance ranged from 84.50% to 85.31%.Considering unknown leakage correction,the thermal efficiency of the waste heat boiler ranged from 85.30% to 85.94%. The counterbalance calculation model directly reflects the heat transfer performance of the  boiler. The positive balance calculation model reflects the actual situation of the overall thermal cycle system. These two methods can provide reference forwaste heat boilers  of the same type  under different assessment conditions.

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