电袋复合除尘器和湿法脱硫装置对电厂燃煤重金属排放协同控制

发布时间：2019-07-21 05:48

【摘要】：对安装有电袋复合除尘器(HPC)和湿法脱硫装置(WFGD)的320 MW燃煤电厂,采用EPA method 29对脱硫后烟气重金属浓度进行测试,同时测定了其他燃煤产物中重金属浓度,分析了除尘和脱硫系统中重金属富集特性,研究了HPC和WFGD对烟气中重金属的脱除作用,比较了不同负荷下HPC和WFGD协同控制作用。结果表明:As,Pb,Cr在袋区灰富集程度更大,电区灰中分布总量更多;袋区能有效捕集烟气中气态汞,Hg富集系数高达1.01。脱硫系统中Hg,As,Pb,Cr均向石膏大规模富集。HPC对Hg的脱除率达到50%,As,Pb,Cr平均脱除率为85%。WFGD对As,Pb,Cr平均脱除率为82%,对Hg的脱除率达到91%。在75%和100%负荷下,烟气中90%以上的Hg,As,Pb,Cr均可被HPC+WFGD协同捕获,HPC在对多种重金属排放控制中起主要作用,且低负荷下减排任务更重。
[Abstract]:In 320 MW coal-fired power plant with electric bag composite dust collector (HPC) and wet desulphurization device (WFGD), the concentration of heavy metals in flue gas after desulphurization was measured by EPA method 29. The concentration of heavy metals in other coal-fired products was determined, the enrichment characteristics of heavy metals in dust removal and desulphurization system were analyzed, the removal of heavy metals from flue gas by HPC and WFGD was studied, and the synergistic control effects of HPC and WFGD under different loads were compared. The results show that As,Pb,Cr is more enriched in ash in bag area and more in ash in electric area, and gaseous mercury in flue gas can be effectively captured in bag area, and the enrichment coefficient of Hg is as high as 1.01. In desulphurization system, Hg,As,Pb,Cr is enriched in gypsum on a large scale. The removal rate of Hg by HPC is 50%. As, the average removal rate of 85%.WFGD to As,Pb,Cr is 82%, and the removal rate of Hg is 91%. Under 75% and 100% load, more than 90% of Hg,As,Pb,Cr in flue gas can be captured by HPC WFGD. HPC plays a major role in the control of heavy metal emissions, and the task of emission reduction is more serious under low load.
【作者单位】：华北电力大学能源动力与机械工程学院;华北电力科学研究院有限责任公司;
【基金】：国家自然科学基金资助项目(51276064)
【分类号】：X773

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