摘要
为解决含水低浓度煤层气利用率低的问题,采用复合床变压吸附工艺分离低浓度煤层气,达到在同一吸附床内同时将低浓度煤层气中水分脱除以及甲烷浓缩的目的,解决含水低浓度煤层气直接变压吸附浓缩的难题,提高含水低浓度煤层气的利用率。研究利用复合床变压吸附试验装置,分析吸附压力、吸附时间以及脱水剂与煤层气分离专用吸附剂在复合床中的装填质量比等工艺条件对含水低浓度煤层气变压吸附性能的影响,得到最佳吸附压力、吸附时间以及脱水剂与专用吸附剂装填质量比。由试验结果可知:针对常压露点25℃、甲烷体积分数15%左右的低浓度煤层气,在复合床变压吸附分离过程中,当吸附压力、吸附时间以及装填质量比逐渐提高时,低浓度煤层气分离性能均出现先升高后降低现象,说明含水低浓度煤层气复合床变压吸附分离工艺存在最佳的吸附压力、吸附时间等最佳工艺参数;经验证含水低浓度煤层气复合床变压吸附分离工艺最佳的吸附压力为600 kPa,吸附时间为180 s,脱水剂与专用吸附剂装填质量比为0.3;在最佳工艺条件下,经含水低浓度煤层气复合床变压吸附分离后得到甲烷浓度为30%以上的产品气,同时甲烷的回收率达到90%以上。
In order to solve the problem of low utilization rate of coal bed methane with low water content,composite bed pressure swing adsorption process is used to separate low concentration coalbed methane.The composite bed pressure swing adsorption experimental device was used to analyze the impact of process conditions such as adsorption pressure,adsorption time,and the loading mass ratio of dehydrating agent and special adsorbent for CBM separation in the composite bed on the pressure swing adsorption performance of low water bearing CBM,and the optimal adsorption pressure,adsorption time and the loading mass ratio of dehydrating agent and special adsorbent were obtained.The experimental results show that:for low concentration CBM with atmospheric dew point of 25℃and methane concentration of about 15%,in the process of pressure swing adsorption separation of composite bed,when the adsorption pressure,adsorption time and loading mass ratio gradually increase in the process of composite bed PSA separation,the separation performance of low concentration coal-bed methane increases first and then decreases.The best adsorption pressure is 600 kPa,the adsorption time is 180 s,and the loading mass ratio of dehydrating agent to special adsorbent is 0.3.At this time,the concentration of methane in the separated product gas is more than 30%,and the recovery rate of methane is more than 90%.
作者
郭昊乾
李小亮
白洪灏
何颖
李雪飞
李艳芳
GUO Haoqian;LI Xiaoliang;BAI Honghao;HE Ying;LI Xuefei;LI Yanfang(CCTEG China Coal Research Insfitute,Beijing 100013,China;Key Laboratory of Coal Efficient Utilization,Energy Saving and Emission Reduction Technology and Equipment,Beijing 100013,China;Beijing Key Laboratory of Coal Based Carbon Materials,Beijing 100013,China)
出处
《洁净煤技术》
CAS
CSCD
北大核心
2023年第S02期574-579,共6页
Clean Coal Technology
基金
煤炭科学技术研究院有限公司科技发展基金资助项目(2020CX-II-05)
作者简介
郭昊乾(1987—),男,河南沁阳人,助理研究员,硕士。E-mail:510376216@qq.com
