703 / 2019-04-30 22:41:19

Experimental Research On CO2 Membrane Separation Characteristics Of Flue Gas From Coal-fired Power Plants

Power plant flue gas, CO2 membrane separation, Gas pressure, Gas flow rate, Gas component fraction

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Today, excessive emissions of greenhouse gases have become a global issue. Among them, CO2 emission from flue gas of coal-fired power plants is the most important concentrated emission source. In order to alleviate the environmental pressure caused by flue gas emission from coal-fired power plants, the research of membrane separation and capture of CO2 in flue gas has attracted wide attention. In this paper, the effects of different factors on the separation of CO2 from single-stage membrane modules were investigated under laboratory conditions by using hollow fiber membrane modules. Three independent variables, inlet gas pressure, inlet gas flow rate and inlet gas component volume fraction, and two dependent variables, volume fraction of CO2 at the permeate end and CO2 recovery rate, are set in this paper. The experimental results show that the inlet gas pressure, inlet gas flow rate and the component fraction of the inlet gas have influence on the characteristics of CO2 separation by single stage membrane module. When the inlet gas pressure exceeds 0.6 MPa, the volume fraction of CO2 at the permeate end gradually decreases with the increase of the inlet gas pressure, and the CO2 recovery rate increases remarkably. When the other conditions are constant, the larger the inlet gas flow rate, the higher the volume fraction of CO2 at the permeate end and the lower the CO2 recovery rate. For the inlet gas component volume fraction, the volume fraction of CO2 at the permeate end and the CO2 recovery rate increase as the volume fraction of CO2 in the inlet gas increases.