Duan Lei, Ma Zi-Zhen, Li Zhen, Jiang Jing-Kun, Ye Zhi-Xiang
Huan Jing Ke Xue. 2015 Mar;36(3):1117-22.
Currently, China suffers from serious pollution of fine particulate matter (PM2.5). Coal-fired power plant is one of the most important sources of PM2.5 in the atmosphere. To achieve the national goals of total emission reductions of sulfur dioxide (SO2) and nitrogen oxides (NO(x)) during the 11th and 12th Five-Year Plan, most of coal-fired power plants in China have installed or will install flue gas desulfurization (FGD) and flue gas denitrification (DNO(x)) systems. As a result, the secondary PM2.5, generated from gaseous pollutants in the atmosphere, would be decreased. However, the physical and chemical characteristics of PM2.5 in flue gas would be affected, and the emission of primary PM2.5 might be increased. This paper summarized the size distributions of PM2.5 and its water soluble ions emitted from coal-fired power plants, and highlighted the effects of FGD and DNO(x) on PM2.5 emission, especially on water soluble ions (such as SO4(2-), Ca2+ and NH4+) in PM2.5. Under the current condition of serious PM2.5 pollution and wide application of FGD and DNO(x), quantitative study on the effects of FGD and DNO(x) installation on emission characteristics of PM2.5 from coal-fired power plants is of great necessity.
目前，中国正遭受细颗粒物（PM2.5）的严重污染。燃煤电厂是大气中PM2.5的最重要来源之一。为实现“十一五”和“十二五”期间二氧化硫（SO2）和氮氧化物（NO(x)）的全国减排目标，中国大多数燃煤电厂已安装或将要安装烟气脱硫（FGD）和烟气脱硝（DNO(x)）系统。因此，大气中气态污染物生成的二次PM2.5将会减少。然而，烟气中PM2.5的物理和化学特性会受到影响，一次PM2.5的排放可能会增加。本文总结了燃煤电厂排放的PM2.5及其水溶性离子的粒径分布，并着重介绍了FGD和DNO(x)对PM2.5排放的影响，特别是对PM2.5中水溶性离子（如SO4(2-)、Ca2+和NH4+）的影响。在当前PM2.5污染严重且FGD和DNO(x)广泛应用的情况下，定量研究FGD和DNO(x)装置对燃煤电厂PM2.5排放特性的影响非常必要。
