脱硫废水蒸发增强电除尘脱除PM_(2.5)和SO_3实验研究  

Experimental study on strengthening the electrostatic precipitation removal of PM_(2.5) and SO_3 by desulfurization wastewater evaporation

作　　者：胡斌[1] 王晓焙 白璐[1] 梁财[1] 杨林军[1] 

机构地区：[1]东南大学能源热转换及其过程测控教育部重点实验室,江苏南京210096

出　　处：《燃料化学学报》2017年第7期889-896,共8页Journal of Fuel Chemistry and Technology

基　　金：国家重点基础研究发展规划(973计划;2013CB228505)资助~~

摘　　要：搭建燃煤热态实验系统,研究脱硫废水蒸发对电除尘和脱硫系统的影响;考察脱硫废水蒸发前后细颗粒粒径的变化、电除尘出口PM_(2.5)和SO_3浓度变化;分析增强电除尘脱除PM_(2.5)和SO_3机理。结果表明,脱硫废水蒸发后,蒸发室出口细颗粒粒径峰值由0.1μm增大到1.1μm,观察脱硫废水蒸发前后扫描电镜,明显观察到废水蒸发后颗粒团聚长大,颗粒间存在絮状物;采用脱硫废水烟道蒸发后,电除尘细颗粒脱除效率提高5%左右,PM_(2.5)数量浓度脱除效率提高25%左右;SO_3脱除效率为60%-80%,烟气中SO_3浓度对增强电除尘脱除PM_(2.5)和SO_3均有影响;脱硫废水蒸发对脱硫系统的效率和脱硫浆液的pH值没有影响。In order to study the influence of desulfurization wastewater evaporation（ DWE） on the ESP and the desulfurization performance,an experimental setup with DWE and the coal-fired thermal system was established.The removal of PM2.5 and SO3 from coal combustion with DWE and the evolution of fine particle size and PM2.5and SO3 concentration at ESP outlet were investigated. Also,the mechanism of PM2.5 and SO3 removal was analyzed. The results show that DWE can increase the average size of particles from 0. 1 μm to 1. 1 μm.Compared SEM image before DWE with that after DWE,the particles reuniting and floc formation between particles are clearly observed. The ESP efficiency is increased by 5%; the removal efficiency of PM2.5 in number concentration is increased by 25% at the ESP outlet; and the removal efficiency of SO3 by ESP is 60%-80%.The SO3 concentration in flue gas has an effect on PM2.5 and SO3 removal by ESP. However,the DWE has no effect on the desulfurization efficiency and the pH value of the desulfurization slurry.

关 键 词：脱硫废水蒸发 PM2.5 SO3 电除尘 协同脱除 

分 类 号：X51[环境科学与工程—环境工程]