大型燃煤机组颗粒物与痕量元素的排放特性  

The Particulate Matter and Trace Elements Emission Characteristics of Large Coal-fired Units

作　　者：盘思伟 张凯 张宇[2] 刘小伟[2] 

机构地区：[1]广东电网有限责任公司电力科学研究院,广东广州510080 [2]华中科技大学煤燃烧国家重点实验室,湖北武汉430074

出　　处：《热能动力工程》2016年第10期84-89,128,共6页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金资助项目(51476064);国家重点基础研究发展计划项目(2013CB228501)

摘　　要：本文分别针对1 000 MW和660 MW燃煤机组在WFGD(湿法石灰石-石膏脱硫塔)后进行了颗粒物现场采样,研究了同一机组在不同负荷以及不同机组在相同负荷比例条件下,颗粒物及痕量元素的排放特性。实验采用称重式DGI(颗粒物采样器)系统对烟气中的颗粒物进行分级取样,计算颗粒物生成量以及痕量元素含量。试验结果显示:对比相同容量不同负荷工况下的结果,可以发现高负荷条件下颗粒物排放量增大,分析认为这是由于较大的负荷变化导致耗煤量增加,燃烧温度升高引起的;痕量元素在飞灰中的富集倍数随颗粒物粒径的变小而增大;颗粒物中痕量元素富集倍数As>Cr>Pb,正比于其挥发特性As>Cr>Pb。Particulate matter sampling tests were performed after the WFGD on the 1 000 MW and 660 MW units to study the emission characteristics of particulate matter( PM) and trace elements at different conditions. Dekati Gravimetric Impactor( DGI) sample system was used to collect the PMs distinguished to four stages. It is concluded that: the PM emission rises with the boiler due to the increases in the coal consumption and the combustion temperature. The trace elements are evidently enriched in fine particle matter; the enrichment order of trace elements is As > Cr >Pb,proportion to the order of the volatileness.

关 键 词：燃煤火电机组 颗粒物 痕量元素 排放特性 

分 类 号：X513[环境科学与工程—环境工程]