钙基干粉喷射联合袋式除尘器脱Hg/SO3的性能分析  

Performance analysis of calcium base dry powders jet combined with bag filter on Hg/SO3 removal

作　　者：王丽娟[1] 栾丽杰[1] WANG Lijuan;LUAN Lijie(Department of Biology and Chemical Engineering,Jining Vocational Technology College,Jining 272037,China)

机构地区：[1]济宁职业技术学院生物与化学工程系,济宁272037

出　　处：《环境工程学报》2020年第3期743-753,共11页Chinese Journal of Environmental Engineering

基　　金：山东省高等学校科技计划项目(J11LB61)。

摘　　要：针对燃煤电厂烟气中Hg/SO3等非常规污染物的高效控制技术尚不完善,活性炭、钠基等吸附剂喷射技术运行成本高等问题,采用实验及工程应用验证相结合的手段,研究了价格低廉的钙基干粉喷射及其与袋式除尘器联合作用对Hg/SO3的脱除性能。结果表明:发现氢氧化钙的脱除能力优于氧化钙,经卤素改性后,氢氧化钙对Hg的吸附效率明显提升,且提升幅度排序为NaBr>CaBr2>NH4Br;经NaBr、CaBr2、NH4Br改性后,氢氧化钙干粉喷射联合袋式除尘器脱Hg效率最高可达95.9%、89.1%、94.7%,氢氧化钙干粉喷射联合袋式除尘器脱SO3效率最高可达79.2%。经工程应用验证,在满负荷、75%负荷、50%负荷条件下,对烟气中Hg的脱除效率分别达79.58%、81.20%、77.91%,对总Hg的脱除效率分别达95.13%、95.80%、96.06%,对SO3脱除效率均在80%以上,且对袋式除尘器的除尘性能无负面影响。研究结果可为燃煤电厂非常规污染物的低成本高效控制提供参考。At currently,the high efficient control technology of unconventional pollutants in coal-fired power plants,such as Hg/SO3,is still incomplete,and the operating costs of activated carbon,sodium-base and other adsorbents jet technology is high.In this study,through the combination of laboratory experiments and engineering on-site validation,the Hg/SO3 removal characteristics by cheap calcium-base dry powder jet combined with bag filter was determined.The results showed that the Hg/SO3 removal ability by calcium hydroxide was better than that of calcium oxide,and the halogen modified calcium hydroxide had a significantly improvement on the Hg adsorption efficiency,the order of above improvement level was NaBr>CaBr2>NH4 Br.Lab test indicated that the Hg removal efficiencies by NaBr,CaBr2 or NH4 Br modified calcium hydroxide dry powders jet combined with bag filter were up to 95.9%,89.1%,94.7%,respectively,and the SO3 removal efficiency by calcium hydroxide dry powder jet combined with bag filter was up to 79.2%.According to the field test of the project,the Hg removal efficiencies from flue gas under full load,75%load and 50% load were 79.58%,81.20% and 77.91%,respectively,the total Hg removal efficiencies were 95.13%,95.80% and 96.06%,respectively,and the removal efficiencies of SO3 were higher than 80%.It had no negative effect on the dust removal performance of the bag filter.This study can provide a reference for the low-cost and high efficient control of unconventional pollutants in coal-fired power plants.

关 键 词：钙基干粉 非常规污染物 吸附剂喷射 袋式除尘器 

分 类 号：X701[环境科学与工程—环境工程]