Abstract
In this paper, wet desulfurization system for a certain 600 MW coal-fired power unit was studied. The field tests were conducted on the limestone wet flue gas desulfurization system of a coal-fired unit. The influence of absorber entrance concentration of SO2 at different loads, as well as the absorber slurry pH value under variable numbers of slurry circulating pumps on desulfurization efficiency were tested. The experiment results also drawn that the start and stop effects of circulating pump on the efficiency of desulfurization rate under different load and the relationship of the slurry density and gypsum quality. On the basis of operation cost analysis, overall power consumption of desulfurization system and the emission fee would be reduced. The optimal operation mode of the slurry circulating pump is given, and the pH value and slurry density are determined.
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