关键词: 火电厂, 烟气, 水蒸气, 中空纤维复合膜, 捕水, 聚醚砜, 磺化聚醚醚酮

Abstract: 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(H2O/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.

Key words: thermal power plant, flue gas, water vapor, hollow fiber composite membrane, vapor capture, polyether sulfone, sulfonated polyether ether ketone