氨法脱硫工艺硫酸铵颗粒生成与排放的影响因素分析  

Factors analysis for affecting the formation and emission of ammonium sulfate particles in ammonia desulfurization process

作　　者：肖育军 邹毅辉 李彩亭[2] XIAO Yujun;ZOU Yihui;LI Caiting(Central China Electrice Power Test and Research Institute Co.Ltd,China Energy Engineering Group,Changsha 410005,China;College of Environmental Science and Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]中国能源建设集团华中电力试验研究院有限公司,长沙410005 [2]湖南大学环境科学与工程学院,长沙410082

出　　处：《环境工程学报》2020年第6期1605-1612,共8页Chinese Journal of Environmental Engineering

摘　　要：针对氨法脱硫工艺实践过程中出口硫酸铵颗粒物浓度高的现象,通过测试某氨法脱硫塔结构优化前、后不同运行条件下净烟气硫酸铵浓度,分析烟气处理量、浆液含固量、烟气温度、工艺水淋洗等因素对其浓度变化的影响规律,提出了氨法脱硫工艺改造的新思路。结果表明:硫酸铵能穿透采样的滤膜与滤筒;优化前、后出口硫酸铵浓度随锅炉负荷的增长而加速增长,随浆液含固量的增加(由5%增加至45%)先加速增长,然后(由45%增加至55%)增长速度逐渐减小,随喷淋水量的增加而降低;浆液含固量与烟气温度是影响硫酸铵析出量,导致出口硫酸铵逃逸的关键因素。因此,降低烟气温度与缩短浆液含固量高条件下的运行时间能是氨法脱硫改造的新思路。Aiming at the phenomenon of high concentration of ammonium sulfate particles in the outlet of the process of ammonia desulphurization,the ammonium sulfate concentration of the clean flue gas from the ammonia desulfurizing tower before and after its structure optimization was tested under different operating conditions.The influences of the flue gas treatment capacity,the solid content of seriflux,the flue gas temperature and the elution of fresh water on the variations of the ammonium sulfate concentration were analyzed,and a new idea for the ammonia desulphurization technological transform ation was proposed.The results showed that ammonium sulfate could penetrate the sampled filter mem brane and filter cartridge.Before and after the structure optimization,the ammonium sulfate concentration in the outlet increased with the increase of boiler loading,and its increase accelerated with the increase of the solid content of seriflux(5%to 45%),then decelerated as the solid content of seriflux increased from 45%to 55%.It decreased with the increase of the elution of fresh water.The solid content of seriflux and the temperature of flue gas were the key factors affecting the crystal precipitation of ammonium sulfate and the escape of ammonium sulfate in the outlet.Therefore,the new ideas for the technological transformation were as follows:reducing the flue gas temperature and the running time at the high solid content of seriflux.

关 键 词：氨法脱硫 结构改造 硫酸铵逃逸 浆液含固量 

分 类 号：X701[环境科学与工程—环境工程]