【摘要】 采集了2个超低排放燃煤电厂湿法脱硫入口和出口的PM_2.5样品,分析了PM_2.5、水溶性离子和多环芳烃（PAHs）的排放规律。结果显示:电厂A和B脱硫出口的PM_2.5浓度分别为（2. 9±1. 2）,（3. 4±2. 0） mg/m³,脱硫系统对PM_2.5去除率分别为32. 6%和34. 6%;但PM_2.5中水溶性离子浓度明显增加,主要离子组分为SO₄^2-、Cl^-和NH₄⁺。厂区内大气环境的PM_2.5浓度相比市区偏高34. 8%,建议对厂区内无组织源加强管理。脱硫出口的PAHs质量浓度分别为（494. 5±243. 9）,（563. 2±310. 3） ng/m³,脱硫系统对PAHs的去除率分别为52. 7%和60. 4%,且对中高环（5～6环）的PAHs去除效果要明显优于低环（2～3环）。WFGD系统前后烟气中的PAHs主要以中低环（2～4环）的组分为主,高环物种含量较少。更多还原

【Abstract】 PM_2.5 samples were collected at the inlet and outlet of the wet flue gas desulfurization（ WFGD） in two ultra-low emission coal-fired power plants in this paper. The PM_2.5 concentration, water-soluble ions, and polycyclic aromatic hydrocarbons（ PAHs） emissions were analyzed. Results demonstrated that the PM_2.5 concentrations were（ 2. 9±1. 2）,（ 3. 4±2. 0） mg/m³ at the outlet of the WFGD in power plants A and B,respectively. The removal efficiencies of the WFGD system on PM_2.5 were 32. 6% and 34. 6% for power plants A and B,respectively. However,the water-soluble ions in PM_2.5 increased obviously. The main increased ions were SO₄^2-,Cl^-,and NH₄⁺. PM_2.5 concentration in the atmospheric environment in power plant was 34. 8% higher than that in the urban area. Therefore,the fugitive emission sources in power plant should be emphasized in the management. The PAHs concentrations at the outlet of the WFGD were（ 494. 5±243. 9）,（ 563. 2±310. 3）ng/m³. The removal efficiency of the WFGD system on PAHs were 52. 7% and 60. 4% for power plants A and B,respectively.The removal efficiencies on 5-and 6-ring PAHs were higher than 2-and 3-ring PAHs. The 2-,3-,and 4-ring PAHs were the main components in the flue gas in the inlet and outlet of the WFGD system,while the 5-and 6-ring PAHs concentrations was comparatively lower.更多还原