Regarding the existing drawbacks in the current sampling methods for condensable particulate matter (SO3) , the traditional sampling units should be optimized to improve the collection efficiency of SO3. Several sampling schemes are compared respectively, including vertical and horizontal condenser plate, condensing coil and isopropyl alcohol absorption. The results show that for the capture effect of SO3 in flue gas, the outcome of the special vertical and horizontal condenser is almost the same, while the two-stage condensate coil exhibits the best performance, followed by the isopropanol absorption method, and the one-stage condensate coil the poorest. Based on this, the best capture scheme coupled two-stage of vertical condenser coil (65℃ constant temperature water bath) with 80％ isopropyl alcohol absorption (0℃ ice bath) is put forward, and the onsite testing is carried out. The test results show that SO3 are captured by all of the above three units. However, the collection efficiency of the first stage condensate coil is the highest, then decreases in turn, and the SO3 capture ratio of the second stage condensate coil and isopropyl alcohol absorption unit is about 26％～40％.%现有的可凝结颗粒物(SO3)采样方法存在弊端,对传统的采样单元进行优化改进,以提高SO3捕集效率.分别对几种采样方案进行了比校,包括1级垂直式与水平式冷凝盘以及冷凝盘管与异丙醇吸收法.对于烟气中SO3的捕集效果,特制的垂直式及水平式冷凝盘效果相当,2级冷凝盘管串联效果最好,异丙醇吸收法次之,1级冷凝盘管最差.据此,提出了2级垂直式冷凝盘管(65℃恒温水浴)+80％异丙醇吸收(0℃冰浴)的最佳捕集方案,并开展现场实测.结果表明,上述3个单元均对SO3有所捕集,第1级盘管捕集量最大,之后依次递减,第2级盘管和异丙醇吸收单元所捕集的SO3占比为26％～40％.
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