水煤浆燃烧可吸入颗粒物分布及排放规律

采用冲击式尘粒分级仪对水煤浆锅炉电除尘器前后的细灰粒径分布进行研究.发现除尘器前细灰粒径分布基本上完全符合对数正态分布，相关系数大于0.999；而除尘器后粒径分布更接近罗辛 拉姆勒分布，相关系数约为0.989.由于电除尘器对粗颗粒的除尘效率高于对细颗粒的除尘效率，导致除尘器后PM1、PM2.5和PM10的质量分数均有很大幅度的提高.烟气中细颗粒的质量分数与锅炉负荷有关，负荷降低将导致烟气中细颗粒的质量分数增大.水煤浆锅炉由于燃料中存在的水分，以及燃烧时雾化和结团的影响，PM2.5和PM10的质量分数低于一般煤粉炉

Size distribution and emission characteristics of inhalable particulate from coal water slurry boiler

The fly ash before and after electrostatic precipitator(ESP) of coal water slurry(CWS) boiler was studied by using a seven-stage cascade impactor.Results indicated that the particle size distribution(PSD) before ESP accorded with logarithmic normal distribution and the correlation coefficient was higher than 0.999,while the PSD after ESP accorded with Rosin-Rammler distribution better and the correlation coefficient was 0.989.The mass fractions of PM1,PM2.5 and PM10 increased greatly after passing through ESP as the efficiency of ESP for coarse particles was higher than that for fine particles.The boiler load affected the fine particle fraction and the fine particle fraction increased as the boiler load decreasing.PM2.5 and PM10 mass fractions were lower than those of typical pulverized coal boiler because of the high water content of fuel and the atomization and coagulation during combustion.