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EXPERIMENTAL STUDY ON VACUUM PRESSURE SWING ADSORPTION OF LOW CONCENTRATION COAL-BED METHANE IN TWIN TOWERS
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摘要: 我国低浓度煤层气资源丰富，但利用率低，且大部分直接排放到环境中，不仅造成了资源浪费，也加重了大气温室效应，因此，对低浓度煤层气进行变压吸附富集分离研究具有节能和环保的双重意义。采用双塔真空变压吸附装置进行低浓度煤层气变压吸附富集分离的研究，实验采用活性炭和碳分子筛混合吸附剂，考察了吸附压力、半周期、吸附塔高径比和混合吸附剂配比等参数对CH4分离效果的影响，并确定了最优工艺条件分别为180 kPa、90 s、7和2。该研究结果可为低浓度煤层气资源化利用提供参考。Abstract: Low concentration coal-bed gas resources are rich in China, but the utilization rate is low, and most of it is directly emitted into the environment, not only caused the waste of resources, also increased atmospheric greenhouse effect. Therefore, the study on enrichment and separation of low-concentration coal-bed gas by pressure-swing adsorption (PSA) technology has the dual function of energy saving and environmental protection. In this paper, the dual-tower vacuum PSA device was used, and the adsorbent in the experiment was activated carbon and carbon molecular sieve mixing adsorbent. The influence of adsorption pressure, half-period, adsorption tower height diameter ratio and mixed adsorbent ratio on the separation effect of CH4 were investigated, and the optimal process conditions were determined as follows:180 kPa, 90 s, 7 and 2, namely. The results could provide technical support for the resource utilization of low concentration coal-bed gas.
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Key words:
- low concentration /
- coal-bed methane /
- activated carbon /
- optimization /
- process condition
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