摘要
在我国大型火电机组中,采用湿法烟气脱硫系统但未设置烟气再热器(GGH)的电厂经常在烟囱周围飘落大量的细小液滴(石膏雨),严重影响电厂周围的环境与居民生活。石膏雨生成的主要原因是湿法脱硫系统排出的烟气温度低、湿度大,为此,确定采用锅炉系统热二次风加热脱硫净烟气的混合式烟气再热技术,对石膏雨问题进行治理。结合抚顺某热电厂的实际,介绍混合式烟气再热技术的原理、实施要点、系统主要设计参数;通过锅炉热效率、锅炉辅机功耗、机组供电煤耗等试验分析数据对混合式烟气再热系统进行技术经济分析;同时以300 MW机组为例,将混合式烟气再热技术与热媒式、回转式GGH进行经济性和安全性比较。实践结果表明,采用混合式烟气再热技术可完全消除石膏雨现象,与传统GGH相比,一次性投资少,年运行费用相对较低,且无腐蚀与堵塞问题,经济效益和社会效益显著。
A large number of raindrops,so-called gypsum rain are found frequently around the smoke stack of large thermal power plants with no GGH installedin the wet FGD system in China.,which seriously affects the environment and the living of people around the plant.It is mainly attributed to the lowe temperature and high humidity of the cleaned flue.Therefore,heating the cleaned flue gas by hot secondary air from boiler island,i.e.admixing and heating the cleaned flue gas(AHG) is designed and applied to eliminate the gypsum rain.Based on the practice in a cogeneration power plant in Fushun,the principle,implementing measure and main designed parameters of AHG are introduced.The technical and economic analysis is carried out with the test data,such as boiler efficiency,auxiliary power consumption and net coal consumption.Taking a 300-MW unit for example,the economics and the safety are compared among AHG,medium GGH and rotation GGH.Significant economic and social benefits are observed from the practice in which the gypsum rain is eliminated by AGH with low investment and annual cost,no corrosion or blocking compared with GGH.
出处
《中国电力》
CSCD
北大核心
2012年第12期26-30,41,共6页
Electric Power
关键词
湿法脱硫
石膏雨
净烟气加热
混合式烟气再热技术
烟气再热器(GGH)
热二次风
煤耗
wet flue gas desulfurization
gypsum rain
heating of cleaned flue gas
fundamentals on admixing and heating of cleaned flue gas
gas-gas heater
hot secondary air
coal consumption
