虽然常规燃煤污染物已实现超低排放,但SO3、可凝结颗粒物等新兴污染物的控制问题还未得到解决。为实现常规和新兴污染物的协同控制,本文研究了燃煤烟气在冷凝喷淋过程中多种污染物的协同脱除技术。试验在一台440t/h的循环流化床燃煤锅炉尾部烟道,对烟气先后进行增湿喷淋和冷凝喷淋处理,在多工况下进行冷凝喷淋协同脱除多种污染物的研究,并确定最佳的运行参数。结果表明:在烟气冷凝喷淋过程中,在液气比4.4~5.4L/m3、喷淋温度18.8~28.1℃的工况范围,可过滤颗粒物的脱除效率为81.9%~100%,SO3的脱除效率为85.5%~93.5%,SO2的脱除效率为84.8%~99.9%,可凝结颗粒物的脱除效率为14.8%~55.4%。证明冷凝喷淋技术能够有效协同脱除多种污染物,对进一步提高燃煤污染物治理水平具有重要意义。

Although conventional coal-fired pollutants have achieved ultra-low emissions,the control issues of emerging pollutants such asSO3 and condensable particulate matter have not yet been resolved. To achieve the collaborative control of them,this paper studies thecollaborative removal technology of various pollutants in coal-fired flue gas during the condensation scrubbing process. In theexperiments,a flow of real flue gas emitted from a 440 t/h coal-fired circulating fluidized bed boiler was treated with humidificationscrubbing and condensation scrubbing successively. The synergistic removal of various pollutants by the condensation scrubbing undermultiple operating conditions were investigated,and the optimal operating parameters were determined. The results showed that duringthe flue gas condensation scrubbing process under the liquid-to-gas ratio of 4.4~5.4 L/m and the scrubbing temperature of 18.8~28.1℃,the removal efficiencies for filterable particulate matter,SO3,SO2,and condensable particulate matter were 81.9%~100%,85.5%~93.5%,84.8%~99.9%,and 14.8%~55.4% respectively,suggesting that the condensation scrubbing technology can effectivelysynergistically remove various pollutants,which is of great significance for further improving the level of coal-fired pollutant control.