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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PM2.5样品,分析了PM2.5、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PM2.5浓度分别为(2. 9±1. 2),(3. 4±2. 0) mg/m3,脱硫系统对PM2.5去除率分别为32. 6%和34. 6%;但PM2.5中水溶性离子浓度明显增加,主要离子组分为SO42-、Cl-和NH4+。厂区内大气环境的PM2.5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。
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