高校化学工程学报2018，Vol.32Issue(1)：44-52,9.DOI:10.3969/j.issn.1003-9015.2018.01.007
真空变压吸附提纯沼气中甲烷的过程模拟
Simulation on Vacuum Pressure Swing Adsorption Processes for CH4Separation from Biogas
摘要
Abstract
In order to meet vehicle gas requirements, a vacuum pressure swing adsorption (VPSA) method was proposed to acquire high purity CH4(over 95%) from biogas composed of 60%(V) CH4, 30%(V) CO2and 30%(V) N2. The adsorption of CH4, CO2, and N2using 13X and CMS was measured, and the vacuum pressure swing adsorption (VPSA) process was divided in two stages based on the adsorption results. In the first stage, the 13X molecule sieve was used as the adsorbent for CO2removal by a six-bed seven-step process. In the second stage, carbon molecule sieve (CMS) was employed as the adsorbent for N2capture by a three-bed six-step process. The breakthrough curves of CH4, CO2and N2mixtures on 13X and CMS were calculated by mathematical models and compared with experimental values. The results demonstrate that the calculated values are in good agreement with that of experiments, which validates the accuracy and reliability of the mathematical models. Simulation results show that CH4purity of 99% with a total recovery of 65% is achieved. The effects of operating pressure in the first stage and adsorption dynamic parameters of CH4and N2in the second stage on purity and recovery of CH4were discussed. The results show that higher adsorption pressure and lower desorption pressure lead to the improvement of purity but decrease of recovery. When CMS shows fast adsorption of N2and slow adsorption of CH4, the purity of CH4can achieve 99%, and this can be used as guidance for the development of CMS.关键词
沼气提纯/CO2及N2脱除/真空变压吸附/吸附剂Key words
biogas upgrading/CO2and N2removal/VPSA/adsorbents分类
化学化工引用本文复制引用
田相龙,王之婧,刘晓勤,马正飞..真空变压吸附提纯沼气中甲烷的过程模拟[J].高校化学工程学报,2018,32(1):44-52,9.基金项目
国家重点基础研究发展计划(2013CB733504). （2013CB733504）
