选择性催化还原协同控制燃煤烟气中汞排放效果影响因素研究  

Research on Influencing Factors of SCR's Cooperative Control in Mercury Emissions From Coal-fired Flue

作　　者：王铮[1] 薛建明 许月阳 王宏亮 刘珺[1] 

机构地区：[1]南京师范大学能源与机械工程学院,江苏省南京市210042 [2]国电科学技术研究院,江苏省南京市210031

出　　处：《中国电机工程学报》2013年第14期32-37,12,共6页Proceedings of the CSEE

基　　金：国家环保公益性行业科研专项项目(200909025)~~

摘　　要：利用安大略法对国内某300 MW机组的燃煤用不同氯含量煤种时,不同氨氮比条件下,选择性催化还原(selectivecatalytic reduction,SCR)装置前后烟气汞形态进行测试分析,结合SCR脱硝装置技术原理,分析了SCR脱硝装置对汞的协同控制作用及煤中氯元素含量、氨氮比对其协同控制效果的影响。研究表明,SCR脱硝装置对烟气中总汞的减排效果不显著,且SCR前后颗粒态汞的浓度变化不大,但烟气经过SCR脱硝装置后,烟气汞的形态会发生改变,煤中氯元素的含量对烟气经过SCR脱硝装置汞形态的转变程度有较大影响;喷氨后,烟气中的氨气对形态汞转化有抑制作用。The paper analyzed the cooperative control impact of selective catalytic reduction （SCR） denitration device on mercury and chlorine content in coals as well as the impacts of ammonia nitrogen ratios on mercury. Based on the SCR denitration device＇s technical principle, taking a 300MW unit as an example, when the unit fueling different coals with different Chlorine contents and under the condition of different ammonia nitrogen ratios, the mercury morphology distribution before and after going through SCR was analyzed by using the Ontario Hydro method. The research shows that the effects of SCR on emission reduction of mercury in flue gas are woak and the changes in the concentration of particulate mercury are small before or after SCR. However, the morphology of mercury changes after the flue gas goes through SCR, and the degree of the change is greatly affected by the chlorine contents in coals. After the injection of element ammonia in flue gas, ammonia shows depressive impact on the mercury conversion.

关 键 词：选择性催化还原 汞 协同控制 氯元素 氨氮比 

分 类 号：TK16[动力工程及工程热物理—热能工程]