“石膏雨”现象已逐渐引起社会各界的关注，研究合理、有效的解决方法已成为当前燃煤烟气污染物控制的重要课题之一。本文对影响“石膏雨”形成的因素进行了分析，湿法脱硫系统取消烟气换热器致使排烟温度降低是“石膏雨”产生的主要原因，其主要影响因素包括设备设计及运行、操作参数变化及外界环境。综述了“石膏雨”检测方法：“石膏雨”的主要成分（浆滴、细颗粒物及 SO3酸雾）的检测手段主要分为采样后化学分析法及电荷或光学物理化学法。针对“石膏雨”的现象提出除尘设备及脱硫系统的设计运行优化、尾部烟道设计优化及增设湿式静电除尘器三种主要的解决措施。面对日益严峻的“石膏雨”问题，政府应当尽快颁布相关规章制度，同时积极开展“石膏雨”的监督检查工作。%The problem of“gypsum rain”has gradually aroused the concern of the society,and the study of reasonable and effective solution has become one of the most important topics in the research of coal-fired flue gas pollution control. In this paper,the factors affecting the formation of“gypsum rain” were analyzed. The main reason for “gypsum rain” was canceling gas gas heater (GGH) in the wet flue gas desulfurization (WFGD) system which lowered exhaust temperature,and other influence factors included equipment design,operation parameters and external environment. The measurement methods of “gypsum rain” were reviewed. Measurement of the main composition of “gypsum rain”(slurry drops,fine particulate matter and SO3 acid mist) could be classified into chemical analysis after sampling,and electric charge or optical physical chemistry method. Three solutions of design and operation optimization of dust removal equipment and FGD system,design optimization of tail flue gas duct,and additional wet electrostatic precipitator (WESP) were proposed. Facing increasingly perilous“gypsum rain”problem,the government should issue related rules and regulations as soon as possible and carry out supervision and inspection of“gypsum rain”at the same time.
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