Experimental Research And Application Analysis On Additives Of Wet Fiue Gas Desulfurization System

The wet FGD technology with limestone-gypsum has been main choice in China’s thermal power plant with all FGD technologies throughout the world. With the large number of wet FGD devices using in power plant, the problems of scaling, corrosion, low desulfurization efficiency and poor stability were gradually exposed. In fact, using simple, inexpensive and readily available desulfurization additives to solve the above problem is a reasonable choice on the premise of not upgrading the original desulfurization equipment. In this paper, a comparative additive performance test was divided done on high-sulfur coal and low sulfur coal-fired power plant desulfurization system under the operating conditions. The comparative experimental research studied the effect of additives under different units, different operating conditions and different inlet SO2concentration and other conditions, and then depending on the inlet concentration of SO2, the best operating results was proposed through changing the system operating conditions. Analysed the additives influence on slurry pH, gypsum quality and limestone consumption. Finally, analysed the economic and technical of desulfurization system operation after adding additives. The results show that, desulphurization additives can greatly reduce the net flue gas SO2concentration, improving the desulfurization efficiency and the role of effect is obvious. Additives can improve desulfurization system inlet SO2volume which is maximum withstand, stable desulfurization system operation, reduce equipment wear and tear, accelerate limestone dissolution, buffer slurry pH, reduce the liquid-gas ratio and Ca/S, so it can play to energy conservation, improve the economic role. This paper had certain direction and reference value for additives using in the actual desulfurization system.