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选用中空纤维膜分离器在常温下对含氧煤层气进行分离提纯处理,实验研究了进气流量和膜两侧压差对脱氧率、甲烷损失率以及氧气传质通量和传质系数的影响。结果显示:脱氧率随着进气流量的增大而减小;膜两侧压差变化对脱氧率影响显著,提高膜两侧压差明显有利于氧气的传质,但甲烷损失率增加。在实验条件下,对于氧气含量为9.31%的原料气,单级膜组件脱氧率可达96%,产品气组成符合爆炸极限安全标准。该实验提供了从混空煤层气中脱除氧气的有效方法。
The hollow fiber membrane separator was used to separate and purify the oxygen-containing coal bed gas at room temperature. The effects of the inlet air flow rate and the pressure drop across the membrane on deoxygenation rate, methane loss rate, oxygen mass transfer flux and mass transfer coefficient . The results showed that the deoxidation rate decreased with the increase of the inlet air flow rate. The pressure difference on both sides of the membrane had a significant effect on the deoxidation rate. Increasing the pressure difference across the membrane was beneficial to the mass transfer of oxygen, but the methane loss rate increased. Under the experimental conditions, for the feed gas with the oxygen content of 9.31%, the deoxidation rate of the single-stage membrane module can reach 96%, and the product gas composition meets the explosion-limit safety standard. This experiment provides an effective way to remove oxygen from the mixed CBM.