煤燃烧过程中污染物的排放，特别是有机污染物的排放受到了广泛关注。基于颗粒物取样系统，对某280 t/h燃煤机组中的脱硫塔、湿式静电除尘器、湿式相变凝聚器前后的可过滤颗粒物、可凝结颗粒物及其有机污染物进行了测试和研究，分析了其对污染物的脱除特性。结果表明：可凝结颗粒物占总颗粒物排放的80.94%～90.16%；脱硫塔、湿式静电除尘器及湿式相变凝聚器可有效降低总颗粒物的排放，总脱除效率达78.58%；可凝结颗粒物中多环芳烃质量分数为64.17～126.40 μg/g，可过滤颗粒物中多环芳烃含量较少，仅有7.52～11.21 μg/g；对可凝结颗粒物有机成分定性分析发现，烷烃类物质是主要成分，占总有机物的42.11%～59.94%；其次是酯类物质，其他有机化合物包括芳香烃、酸类、醇类、酮类等。

The emission of pollutants in coal combustion process,especially organic pollutants,has received increasing attention. Based on the particulate matter sampling system,the filterable particulate matter (FPM),condensable particulate matter (CPM) and organic pollutants were measured and studied at the inlet and outlet of desulfurization tower (WFGD),wet electrostatic precipitator (WESP) and wet phase transition agglomeration system (WPTA) in a 280 t/h coal-fired unit. The pollutant removal characteristics of the devices were analyzed. The results show that CPM accounts for 80.94%-90.16% of the total particulate matter concentration. WFGD,WESP and WPTA can effectively reduce the emission of total particulate matter,and the total removal efficiency reaches 78.58%. The concentrations of polycyclic aromatic hydrocarbons (PAHs) in CPM are 64.17-126.40 μg/g,while the content of PAHs in FPM is only 7.52-11.21 μg/g. From the qualitative analysis of the organic compositions in CPM,it is found that alkanes are the main components,accounting for 42.11%-59.94% of the total organic matter,followed by esters,and other organic compounds,including aromatic hydrocarbons,acids,alcohols,ketones,et al.

0 引言

1 研究对象

2 采样和分析方法

   2.1 采样方法

   2.2 分析方法

3 颗粒物排放特性

   3.1 FPM及CPM在烟气中的排放特性

   3.2 CPM中有机、无机组分的排放特性

4 颗粒物中有机污染物的排放特性

   4.1 FPM中有机污染物的排放特性

   4.2 CPM中有机污染物的排放特性

5 结论