低阻陶瓷膜组件回收烟气水热试验研究

Experimental study on hydrothermal recovery from flue gas with low resistance ceramic membrane module

采用陶瓷膜组件进行了烟气水分及余热的回收实验,研究了膜间距(20、25、34 mm)、冷却水温度(15~35℃)、冷却水流量(50~170 L/h)和陶瓷膜平均孔径(50、100 nm)对膜组件水热回收性能的影响。结果表明:膜组件间距的减小、冷却水流量的提高和冷却水温度的降低均能有效提高陶瓷膜对烟气的水热回收性能;减小陶瓷膜的孔径能有效提高陶瓷膜的水通量和水回收效率,但对热通量的影响较小;在实验工况下,陶瓷膜的水、热通量以及水回收效率的最高值分别为29 kg·m^-2·h^-1、65 MJ·m^-2·h^-1和46%;与平直翅片换热器和螺旋板换热器相比,陶瓷膜组件的阻力因子较小,烟气在膜组件的阻力因子仅为0.0059。

Experiments of water and waste heat recovery from flue gas were carried out with a ceramic membrane module,and the effects of membrane spacing(20,25,34 mm),cooling water temperature(15~35℃),cooling water flow rate(50~170 L/h)and average pore size(50,100 nm)on water and heat recovery performance of membrane modules were studied.The results showed that reducing the distance between membrane components,increasing of cooling water flow rate or decreasing cooling water temperature could effectively improve the water and heat recovery of ceramic membrane from flue gas.Reducing the pore size of ceramic membrane could improve the water flux and water recovery efficiency of ceramic membrane effectively,but cause little effect on the heat flux.Under the experimental conditions,the maximum values of water flux,heat flux and water recovery efficiency were 29 kg·m^-2·h^-1、65 MJ·m^-2·h^-1 and 46%,respectively.Compared with flat-finned heat exchanger and spiral plate heat exchanger,the resistance factor of the ceramic membrane module was smaller,and the resistance factor of flue gas in the membrane module was only 0.0059.