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由于热电厂废气中含有高湿饱和水蒸气,选用疏水材料活性炭为吸附剂,利用真空变压吸附技术研究了活性炭分离电厂废气中水蒸气和二氧化碳的可行性和优越性,研究了水对CO2捕集的影响。实验分析表明,水在活性炭上的“S”型等温吸附曲线有利于真空条件下被解吸。同时,圆锥模型描述了水蒸气在吸附床内的浓度分布。结果表明,即使水蒸气可以被活性炭吸附,但它的存在不影响CO2的捕集。每个循环操作可在相对较短的解吸时间和较高的解吸压力下完成。实验中单床三步变压吸附工艺可以使CO2回收率高达80%,CO2纯度达43%。
Since the heat and power plant exhaust gas contains high-humidity saturated steam, hydrophobic material activated carbon is selected as adsorbent, the feasibility and superiority of activated carbon for separating water vapor and carbon dioxide in power plant exhaust gas are studied by using vacuum pressure swing adsorption technology. The effects of water on CO2 capture Impact. Experimental analysis shows that the “S” isothermal adsorption curve of water on activated carbon is conducive to desorption under vacuum. At the same time, the conic model describes the concentration of water vapor in the adsorption bed. The results show that even though water vapor can be adsorbed on activated carbon, its presence does not affect the capture of CO2. Each cycle operation can be done with a relatively short desorption time and a high desorption pressure. In the experiment, the single-bed three-step pressure swing adsorption process can make CO2 recovery up to 80% and CO2 purity up to 43%.