热电厂烟道气中CO2分离无机膜的制备
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TQ028

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Preparation of inorganic membrane for CO2 separation in flue gas of thermal power plant
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The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    利用溶胶凝胶法制备氧化物粉体前驱体,然后高温焙烧得到具有钙钛矿结构的粉体,利用相转化-烧结技术制备中空纤维膜。将碳酸盐按照一定比例混合制得低共熔体,在高温熔融条件浸渍制备双相膜。该膜具有氧化物相和碳酸盐相,在高温下碳酸盐相可以通过碳酸根离子进行传导,而阳离子则通过钙钛矿相进行传递,从而完成对CO2的分离。把双相膜安装在自制反应器中,在膜内外分别通入氦气作为吹扫气和烟道气,并将尾气通过气相色谱在线监测气体中的组成,然后通过计算得出CO2的高温透过量,实验结果表明在850℃的透量最高为1.221 mL/( cm2.min),为热电厂烟道气的处理提供了一种新的思路。

    Abstract:

    The La0.6S0.4Co0.2Fe0.8O3-δ(LSCF)powders were prepared by the sol-gel method, and then calcined at high temperature. The polyethersulfone(PESf) was dissolved by using N-methyl pyrrolidone(NMP)as solvent, and the powders were added to stir to obtain a fluid casting film. The hollow fiber membranes were prepared by the phase inversion-sintering technology, and sintered at high temperature to obtain a porous hollow fiber membrane with perovskite structure. The eutectic is prepared by mixing the carbonates according to a certain ratio, and the hollow fiber membrane is impregnated under high temperature melting conditions for several minutes to prepare a dual-phase membrane. The membrane has two phases, namely an oxide phase and a carbonate phase. At high temperature, the carbonate phase can be conducted through carbonate ions, while the cations are transmitted through the perovskite phase, thereby completing the separation of CO2. Through the simulation of the flue gas, the prepared dual-phase membrane was installed in a self-made reactor, and helium gas was passed into the membrane as the purge gas and the flue gas as the raw gas, and the tail gas was monitored online by gas chromatography. Then calculated to calculate the high-temperature permeability of CO2. The experimental results show that the maximum permeability at 850℃ is 1.221mL/( cm2.min), which provides a new idea for the treatment of flue gas in thermal power plants.

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庄淑娟,宋峰. 热电厂烟道气中CO2分离无机膜的制备[J]. 科学技术与工程, 2020, 20(28): 11706-11710.
庄淑娟. Preparation of inorganic membrane for CO2 separation in flue gas of thermal power plant[J]. Science Technology and Engineering,2020,20(28):11706-11710.

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  • 收稿日期:2020-01-14
  • 最后修改日期:2020-06-26
  • 录用日期:2020-03-03
  • 在线发布日期: 2020-11-03
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