燃煤烟气中SO_3转换吸收特性模拟实验  

Simulation experiment of SO_3 conversion and absorption characteristics in coal-fired flue gas

作　　者：常景彩[1] 董勇[1] 王志强[1] 闫君[1] 陈朋[1] 马春元[1] 

机构地区：[1]山东大学能源与动力工程学院燃煤污染物减排国家工程实验室,山东济南250061

出　　处：《煤炭学报》2010年第10期1717-1720,共4页Journal of China Coal Society

基　　金：国家"十一五"科技支撑计划资助项目(2006BAA01B04);山东省科学技术发展计划资助项目(2009GG2GC06003);山东省优秀中青年科学家科研奖励基金资助项目(BS2009HZ021);山东大学自主创新基金资助项目(2009GN043)

摘　　要：为揭示燃煤烟气中SO3进入湿法脱硫(WFGD)塔前后的转换吸收特性,采用臭氧氧化法产生SO3,并通过对SO3的浓度、不同吸收剂的吸收率及转化物的粒径分布测量分析,得到SO3进入湿法脱硫塔前后的形态转换吸收规律。结果表明:SO3转化为气溶胶颗粒物,粒径分布形成[0,40]、[41,70]、[71,100]等3个区间段,相应的置信水平分别为79%、17%、4%;不同吸收剂对SO3的吸收率从小到大依次为:CaCO3浆液(30%)<湿法脱硫浆液<NaOH溶液(0.25mol/L)<去离子水;湿法脱硫浆液对SO3的吸收率为64.21%,温度在50～85℃变化时,吸收率无明显变化;SO3在进入脱硫塔后全部以硫酸雾形态存在,净烟气中的酸雾含有未脱尽的硫酸雾部分。SO3 was produced by means of oxidation of SO2 by O3,and the conversion and anisotropic absorptivity of SO3 and particle size distribution were investigated.The results show that SO3 translates into acid mists which is verified by the characteristics of particle size distribution measured by PDA under the simulation parameters.The actual particle size distribution of SO3 forms three intervals such as[0,40],[41,70]and[71,100],and the confidence levels are 79%,17%,4% in sequence.The absorptivity of different absorber from low to high is CaCO3（30%） desulfurizer NaOH（0.25 mol/L） deionized water.The absorptivity of desulfurizer is 64.21% and not influenced by temperature.All SO3 translates into acid mists after entering into wet flue gas desulfurization（WFGD）,and the proportion of acid mists existed in purified flue gas is not absorbed by desulfurizer.

关 键 词：SO3 吸收特性 湿法脱硫(WFGD) 粒径分布 

分 类 号：TQ534.9[化学工程—煤化学工程]