Abstract:In most coal-fired power plants without GGH, limestone-gypsum wet flue gas desulfurization(WFGD) is prone to the phenomenon of gypsum rain in the emissions process. The factors affecting gypsum rain and reasons for the formation are studied. The measures in terms of improving the efficiency of mist eliminator, raising net flue gas temperature, optimizing the design of the chimney and optimizing operation of existing desulfurization facilities are put forward.