电厂湿法烟气脱硫颗粒物排放特性的实验研究

Experimental Study on Emission Characteristics of Particulate Matters from Wet Flue Gas Desulfurization System of a Coal-fired Power Plant

在锅炉100%和80%负荷工况下,采集某200 MW燃煤电厂湿法烟气脱硫(WFGD)系统前后的颗粒物,得到烟气中颗粒物的质量浓度和粒径分布,并通过观察颗粒物的形貌对颗粒物中元素的组分和含量进行检测.结果表明:WFGD系统入口处总悬浮颗粒物(TSP)的质量浓度约为16.0mg/m3,出口处TSP的质量浓度低于10.0mg/m3,TSP的脱除效率为46.8%;随着锅炉负荷的降低,颗粒物的脱除效率提高;WFGD出口处的颗粒物中存在Ca元素,颗粒物凝结团聚成不规则的絮凝状颗粒物;在除雾器冲洗状态下,颗粒物的质量浓度减小,元素Ca、S、C和O的含量显著减小,颗粒物主要呈圆形,且分布较为疏散.

Particulate matters in areas before and after the wet flue gas desulphurization（WFGD）system of a 200 MW coal-fired power plant were collected at 100% and 80% boiler loads,so as to obtain the mass concentration and size distribution of particulate matters in the flue gas,and to detect the composition and content of elements involved by observing the morphology of above particulate matters.Results indicate that the mass concentration of total suspended particulate（TSP）is about 16 mg/m3（in standard state）at the inlet of WFGD system,which is below 10 mg/m3 at the outlet,and the removal efficiency of TSP is46.8%.The removal efficiency of particulate matters increase with the decrease of boiler load.Element calcium is found in the particulate matters at WFGD outlet,where irregular flocculation structures are formed through agglomeration and coagulation of particles.Under mist eliminator washing condition,the mass concentration of particulate matters decreases,and the content of elements Ca,S,C and O reduces obviously,when the particulate matters are mainly in round shape and dispersedly distributed.