纳米陶瓷膜烟气脱水及余热回收实验分析

Experimental Analysis of Flue Gas Dehydration and Waste Heat Recovery with Nanometre Ceramic Membrane

采用纳米陶瓷膜开展烟气脱水及余热回收实验,分析了实验系统中湿烟气的过饱和系数,验证了陶瓷膜应用于烟气脱水及余热回收的可行性,探讨了烟气体积流量、烟气温度、循环水体积流量和陶瓷膜孔径等因素对烟气脱水及余热回收特性的影响,并对烟气水分跨膜传递动力进行了研究。结果表明:水蒸气分压差是实现纳米陶瓷膜烟气脱水的源动力;提高烟气温度有助于提高烟气水热回收性能指标,而增加烟气体积流量并不能提高烟气水热回收效率;在选定的实验参数内降低循环水温度略有助于增强烟气水热回收特性,而循环水体积流量过高会导致陶瓷膜内渗入大量的非凝性气体;10 nm陶瓷膜的水回收性能指标优于0.4 nm陶瓷膜,水回收速率高达6.45 L/(h·m^(2)),热回收功率高达129.45 W。

The experiment of flue gas dehydration and waste heat recovery was carried out with nanometer ceramic membrane. The super saturation coefficient of wet flue gas was analyzed. The feasibility of applying ceramic membrance to flue gas dehydration and waste heat recovery was verified. The effects of the operating factors, such as flue gas flow rate, flue gas temperature, circulating water flow rate, ceramic membrane pore size, on the flue gas dedydration and waste heat recovery were discussed.The transfer power of flue gas water across membrane was also studied. Results show that partial pressure difference of the water vapor is the source power of the flue gas dehydration by nanometer ceramic membrane. The increase of the flue gas temperature can promote the performance index of flue gas dehydration and waste heat recovery, however the increase of the flue gas flow rate cann’t improve the efficiency of water or waste heat recovery. Within the selected experimental parameters, reducing the temperature of circulating water is helpful to recover the moisture and waste heat from flue gas, while excessive circulating water flow rate will lead to a large number of non-condensable gases into the membrane. The water recovery performance index of 10 nm ceramic membrane is better than that of 0.4 nm ceramic membrane. The water recovery rate and the heat recovery power of 10 nm ceramic membrane are as high as 6.45 L/(h·m^(2)) and 129.45 W respectively.