复合膜法火电厂烟气捕水性能的实验研究

Experimental Study on Flue Gas Water Recovery Performance Using Composite Membranes in Thermal Power Plants

复合膜法捕集火电厂烟气中的水蒸气有望成为火电厂节水的一条有效途径。选用聚醚砜（PES）作为中奄纤维膜支撑层材料，磺化聚醚醚酮（SPEEK）作为中空纤维膜涂层材料．制作了用于实验研究的SPEEKPES中空纤维复合膜；采用模拟烟气（H2O／N2）在实验台上研究了不同磺化度的SPEEK涂层、吹扫气流速、烟气温度等对中空纤维复合膜捕水性能的影响。实验结果表明，复合膜中SPEEK的磺化度不是越高越好;吹扫气流速也存在一个最优值；在实验温度范围（40～70℃）内，随着温度的提升，复合膜的捕水性能有所提高。

Water recovery by composite membranes from flue gas is expected to be an effective technology for water saving in thermal power plants. In this study, the SPEEK-PES hollow fiber composite membrane is made by using polyether sulfone （PES） as the hollow fiber membrane support layer material and sulfonated polyether ether ketone （SPEEK） as the coating material for the hollow fiber membrane; the effect of different sulfonation degrees of SPEEK coating, purge gas flow rate and flue gas temperature, on the water capture performance of hollow fiber composite membrane is studied with the simulated flue gas （H20/N2）. The experimental results show that higher sulfonation degree of SPEEK of the composite membrane does not mean better; the purge gas flow rate also has an optimal value; in the range of experimental temperatures （40 -70℃）, with the temperature increasing, the water capture performance of the composite membrane improves.