无机陶瓷膜烟气余热回收特性实验研究

Experimental study on flue gas waste heat recovery characteristics of inorganic ceramic membrane

燃煤电站锅炉排放湿饱和烟气导致大量低温余热损失。无机陶瓷膜耐酸碱、具有较强的化学稳定性,是回收烟气低温余热的理想材料。以无机陶瓷膜为核心开展烟气余热回收实验,分析了锅炉尾部低温烟气特征参数;以316 L不锈钢为比较对象,探讨了无机陶瓷膜在提高热回收功率及复合传热系数等方面的强化作用。结果表明:烟气余热回收以水分的汽化潜热回收为主,占比约为90%;循环水作为冷却介质,烟气余热回收能力更强;与循环水相比,以空气作为冷却介质时,无机陶瓷膜烟气余热回收强化效果更加显著,强化系数高达9;增大烟气流量有助于提高热回收功率与复合传热系数;同时无机陶瓷膜还可以回收水质较高的冷凝水。本文研究结果可为无机陶瓷膜应用于烟气余热回收提供参考。

The emission of wet saturated flue gas from coal-fired power station boiler leads to a large amount of low-temperature waste heat loss.Inorganic ceramic membrane is acid and alkali resistant and has strong chemical stability,which is an ideal material for recovering low-temperature waste heat from flue gas.In this paper,inorganic ceramic membrane is used as the core to carry out flue gas waste heat recovery experiment.The characteristic parameters of low temperature flue gas in boiler tail are analyzed.Compared with 316 L stainless steel,the strengthening effect of inorganic ceramic membrane in flue gas waste heat recovery is discussed.The results show that,the waste heat recovery of flue gas is mainly the latent heat recovery of water vaporization,up to 90%.Using circulating water as cooling medium will make the flue gas waste heat recovery ability stronger.Compared with circulating water,the inorganic ceramic membrane has a more significant effect on the recovery of waste heat from flue gas,and the enhancement coefficient is as high as 9(using air as cooling medium).Increasing the flue gas flow helps to improve the heat recovery power and compound heat transfer coefficient.At the same time,the inorganic ceramic membrane can also recover the condensate with higher water quality.This paper provides reference for recovery of waste heat from flue gas by inorganic ceramic membrane.