Ma Liang, Zhao Zhihuang, Tian Chengcheng, Wang Hualin, Liu Yi
National Engineering Laboratory for Industrial Wastewater Treatment, East China University of Science and Technology, Shanghai, 200237, P.R. China.
Sci Rep. 2020 Feb 19;10(1):2929. doi: 10.1038/s41598-020-59833-3.
Industrial flue gas systems include fine soot and high-temperature vapor. The continuous emission of the flue gas not only causes fine particulate pollution but also wastes considerable heat energy. Separating soot and purifying flue gas are of great significance for industrial conditions and environmental protection. In this paper, the process of cyclone soot elimination and waste heat recovery by heterogeneous condensation were coupled for the first time. The effects of the flue gas material system and separation operation parameters on the cyclone soot elimination efficiency and heat transfer efficiency were systematically investigated through unit experiments and industrial side-lines. Additionally, the mechanism of enhanced cyclone soot elimination by heterogeneous condensation was also theoretically explored. The experimental results show that the corresponding maximum cyclone heat transfer efficiency and soot elimination efficiency of the Ф40 mm cyclone separator are 42.1% and 89.2%, respectively, while the Ф80 mm cyclone separator can attain an elimination efficiency of 91% and a maximum increase of 67.3% for the heat transfer efficiency, as indicated by the industrial side-line. During the process of cyclone soot elimination and heat recovery by heterogeneous condensation, the heterogeneous condensation caused by heat transfer increases the quality difference between the flue gas molecules and soot droplets, thus improving the cyclone separation efficiency of soot.
工业烟气系统包含细烟尘和高温蒸汽。烟气的持续排放不仅会造成细颗粒物污染，还会浪费大量热能。分离烟尘和净化烟气对于工业生产条件和环境保护具有重要意义。本文首次将旋风除烟尘过程与异质冷凝余热回收过程进行耦合。通过单元实验和工业侧线，系统研究了烟气物质体系和分离操作参数对旋风除烟尘效率和传热效率的影响。此外，还从理论上探讨了异质冷凝强化旋风除烟尘的机理。实验结果表明，工业侧线数据显示，Ф40 mm旋风分离器对应的最大旋风传热效率和除烟尘效率分别为42.1%和89.2%，而Ф80 mm旋风分离器的除烟尘效率可达91%，传热效率最大可提高67.3%。在旋风除烟尘和异质冷凝热回收过程中，传热引起的异质冷凝增加了烟气分子与烟尘颗粒之间的质量差，从而提高了旋风分离烟尘的效率。
