湿法烟气脱硫中石膏雨的形成及其控制措施

Formation and Control of Gypsum Rain in Wet Flue Gas Desulfurization

采用石灰石-石膏湿法脱硫工艺的燃煤电厂在取消烟气换热器(GGH)之后,石膏雨现象变得严重,对环境造成不良影响。深入分析了石膏雨的来源、形成过程及影响因素,介绍了几种常见且具有一定工业应用价值的石膏雨解决方案,并结合各方案的工程案例讨论了各自的优缺点,为燃煤电厂湿法脱硫系统改造提供借鉴。同时指出,对当前的脱硫工艺进行优化以及开发适合我国国情的新型湿式电除尘器设备,对于我国大气污染防治具有前瞻性意义。

With the elimination of gas-gas heater （GGH） from the limestone-gypsum wet desulfurization process in coal-fired power plants,the gypsum rain becomes serious,and brings negative impacts on the environment.This paper deeply analyzes the sources,forming process and influencing factors of the gypsum rain,and introduces several common solutions with certain engineering values.Based on the related engineering cases,the pros and cons of each solution are discussed to provide reference for wet flue gas desulfurization （WFGD） system improvement in coal-fired power plants.Moreover,suggestions for optimizing the desulfurization process and developing new WFGD equipment suitable to Chinese conditions are also included,which will be beneficial to the future air pollution control in China.