超低排放燃煤电厂中湿式电除尘器对可凝结颗粒物排放特性的影响

为了解不同负荷下超低排放燃煤电厂中湿式电除尘器（WESP）对可凝结颗粒物（CPM）排放特性的影响，基于US EPA Method 202搭建了CPM采样装置，分析了某安装有WESP的超低排放燃煤电厂烟气中CPM的排放水平，评估了机组负荷对CPM排放浓度的影响以及WESP对CPM中各组分的脱除效率．结果表明，在75%负荷和100%负荷条件下，超低排放电厂CPM的排放量分别为27.27 mg·m^-3和28.71 mg·m^-3,WESP对CPM的脱除效率分别为35.59%和27.59%.SO₄^2-是CPM中水溶性离子的主要成分，在不同负荷条件下SO₄^2-在CPM中无机组分的质量分数达到了65%以上；WESP对于CPM中Cl^-、K⁺、Ca²⁺、Mg²⁺和Na⁺等无机离子的脱除效率可以达到30%～50%，但会使CPM中SO₄^2...

Effect of WESP on Emission Characteristics of Condensable Particulate Matter from Ultra-low Emission Coal-fired Power Plants

In order to study the effect of wet electrostatic precipitators(WESP) on emission characteristics of condensable particulate matter (CPM) from ultra-low emission coal-fired power plants that are under different capacity conditions, a set of CPM sampling devices was built based on US EPA Method 202, and an ultra-low emission coal-fired power plant was detected. This study evaluated the emission level of the CPM from the flue gas of coal-fired power plants, the effects of different unit capacity conditions on the CPM emission concentrations, and the removal efficiency of WESP for different components of the CPM. The results suggested that the emission concentrations of the CPM from ultra-low emission power plants were 27.27 mg·m^-3 and 28.71 mg·m^-3under the conditions of 75% and 100% capacity, respectively. The removal efficiencies of WESP for the CPM were 35.59% and 27.59%, respectively. SO₄^2- was the main component of water-soluble ions of the CPM. The proportion of SO₄^2- in inorganic components of the CPM reached more than 65% under different capacity conditions. In addition, the removal efficiency of WESP for Cl^-, K⁺, Ca²⁺, Mg²⁺, Na⁺, and other inorganic ions reached 30%-50%, but the mass concentrations of SO₄^2- and NO₃^- increased.