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快速(真空)变压吸附循环周期较短,床层压力周期性变化快,使吸附床内流动及传热传质特性变化较大,本文研究吸附及解吸压力对快速变压吸附制氧床内速度及循环性能的影响.快速变压吸附(rapid pressure swing adsorption,RPSA)循环中原料气充压阶段气流速度远大于顺流的气体流速极限值,快速真空变压吸附(rapid vacuum pressure swing adsorption,RVPSA)循环中原料气充压阶段气流速度略大于顺流的气体流速极限值,而RPSA循环和RVPSA循环中放空降压阶段气流速度均较大.在所研究的吸附和解吸压力范围内,RPSA循环和RVPSA循环中气体温度在循环周期内变化均约为10℃,而RVPSA循环中气体温度在循环周期内温度梯度更大.RPSA循环中吸附压力越高,氧气回收率越高,床层因子越小;而RVPSA循环中解吸压力越低,氧气回收率越高,床层因子越小.
Rapid vacuum (vacuum) pressure swing adsorption adsorption cycle is short, the bed pressure changes rapidly, the adsorption bed flow and heat and mass transfer characteristics vary greatly in this paper adsorption and desorption pressure on the rapid pressure swing adsorption oxygen bed Speed and cycle performance of the system.Rotary pressure swing adsorption (RPSA) cycle gas feed rate during the charge of the feed gas flow rate is much larger than the downstream gas flow rate limit, rapid vacuum pressure swing adsorption (rapid vacuum swing adsorption, RVPSA) cycle was slightly larger than the downstream gas flow rate, while the RPSA cycle and the RVPSA cycle had a larger air velocity during the venting and depressurization stage.In the range of adsorption and desorption pressures studied, RPSA The gas temperature in the cycles and the RVPSA cycles varied by about 10 ° C during the cycle, while the gas temperature in the RVPSA cycle had a greater temperature gradient over the cycle. The higher the adsorption pressure in the RPSA cycle, the higher the oxygen recovery and the higher the bed factor The smaller the desorption pressure in the RVPSA cycle, the higher the oxygen recovery and the smaller the bed factor.