新型偏心径向热管式烟气余热回收系统设计与应用

Design and Application of the Recovery System of Waste Heat from Flue Gas by New Radial Eccentric Heat Pipe

针对含酸性气体、粉尘等恶劣条件下的烟气余热资源回收系统存在的问题,提出了一种适用于恶劣烟气工况下以偏心径向热管为传热元件的余热锅炉,介绍了偏心径向热管技术及其换热器,并对偏心径向热管余热锅炉工艺关键点进行了设计分析,推导出了径向热管安全直径比,对偏心径向热管余热锅炉进行了实际应用研究.结果表明,这种锅炉具有较高的使用性能,余热回收效率达92.5?,使用过程中未发生低温腐蚀现象,系统运行3年未发生影响正常生产的事故,预计换热管使用寿命可达5年.

According to the problems of the reovery system of waste heat from flue gas, a waste boiler with a radial eccentric heat pipe as the heat transfer unit is designed, which is applicable to poor working conditions containing acid gas, dust and others. The radial eccentric heat pipe technology and heat exchanger are expounded and analyzed, and key points of radial eccentric heat pipe waste heat boiler technology are analyzed in the design conluding safety length ratio of the radial eccentric is derived. In practical engineering, the radial eccentric heat pipe waste heat boiler is investigated. The results show that the eccentric radial heat pipe waste heat boiler has higher performance and the waste heat recovery efficiency is up to 92.5%. Also low temperature corrosion is avoided, no evidence impacting on normal production has been found during the past three years. More over, the expected service life of heat transfer tube can reach to five years.