某600MW机组烟气污染物超低排放改造工程采川“烟塔合一”技术,将脱硫塔、湿式电除尘器、烟囱一并布置在间接空气冷却塔内(简称四塔合一).介绍该超低排放改造方案;采用有限元分析方法并结合工程改造经验,在结构计算及分析基础上对四塔合一布置方案进行优选;比较三塔合一与四塔合一方案的技术经济性,比较四塔合一方案中不同布置方案和不同支撑方式的技术经济性.选取将脱硫塔、湿式电除尘器、烟囱三者竖向一体布置方案,对原有脱硫塔进行加固,特别介绍超限高温电梯设计原则与方法.改造工程实施后的运行结果表明,环保设施运行稳定,机组在高中低3种负荷及3种煤质情况下,SO2排放质量浓度平均值约9mg/m3,烟尘排放质量浓度平均值约3.38 mg/m3,节能及环保效益显著.%The ultra-low emission of flue-gas pollutants reformation project on a 600 MW unit adopts gas tower integration technology,bringing the desulfurization tower,the wet electrostatic precipitator and the chimney in one indirect dry cooling tower (the 4-in-1 tower).In this paper,a scheme of ultra-low emission reform is introduced and the finite element method combining with the practical experience is adopted to optimize the 4-in-1 tower layout on the basis of structural calculation and analysis.Comparisons are made between the 3-in-1 scheme and the 4-in-1 one,also between the two different layouts of 4-in-1 tower,from the technological and economic perspectives.The vertical integrated layout for the desulfurization tower,the wet electrostatic precipitator and the chimney is adopted.The original desulfurization tower is reinforced also.The principle and method of the design for the over-limit high temperature elevator are introduced.Application results showed that the environmental protection facilities are working steadily.Operating with high,medium and low load levels and three types of coal quality,the average mass concentration of SO2 is about 9 mg/m3,and the average mass concentration of dust is about 3.38 mg/m3,demonstrating better benefit in energy saving and environmental protection.
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