燃煤电厂可凝结颗粒物（SO3）采样方法研究

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%。

Study on the Method of Sampling of Coagulated Particulate Matter (SO3) in Coal-Fired Power Plants

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%.