洁净煤技术

2020, v.26;No.130(06) 151-158

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驱替煤层气CO_2分离研究
Research on CO_2 separation of displacing coal-bed methane

李雪飞;车永芳;郭昊乾;李小亮;
LI Xuefei;CHE Yongfang;GUO Haoqian;LI Xiaoliang;Coal Chemistry Branch of China Coal Research Institute;Beijing Key Laboratory of Coal Based Carbon Materials;State Key Laboratory of High Efficient Mining and Clean Utilization of Coal Resources;

摘要(Abstract):

CO_2驱煤层气技术是CO_2利用的重要途径之一。CO_2驱煤层气既实现了CO_2的地下封存利用,又提高煤层气采收率。受煤层地质条件复杂性影响,CO_2注入后不能完全封存在煤层中,随着煤层气排采会逐渐渗出,使得驱替煤层气中含有CO_2,需经分离脱除后才能输送至管网。针对驱替煤层气产量、组成及压力条件,测定了CO_2和CH_4在碳分子筛上的吸附特性曲线,计算了CO_2/CH_4平衡分离系数。利用变压吸附评价装置进行了CO_2/CH_4分离提纯工艺评价试验,计算了吸附剂处理量和CH_4回收率。结果表明,CO_2和CH_4在碳分子上的吸附符合I型吸附等温线,CO_2吸附量为1.27 mol/kg,CH_4吸附量为0.48 mol/kg,CO_2/CH_4平衡分离系数为3.38,碳分子筛吸附剂分离比大,主要基于动力学速率进行分离,CO_2作为吸附相获得,CH_4则作为非吸附相获得。CO_2/CH_4在吸附压力600 kPa,吸附时间120 s条件下,经变压吸附分离后产品气中CO_2浓度在1%以下; CO_2/CH_4分离尾气在吸附压力500 kPa,吸附时间120 s条件下,经变压吸附提纯后,产品气中CO_2浓度在5%以下。可将CO_2/CH_4分离产品气和分离尾气再提纯产品气混合得到最终产品气。CO_2/CH_4经变压吸附分离提纯后产品气中CO_2浓度在1%以下。以单井产量1 200 Nm~3/d为例,单位吸附剂处理能力在100 Nm~3/h左右,CH_4回收率达到92.375%。驱替煤层气经净化后可通过变压吸附分离提纯脱除CO_2后输送至管网。
CO_2 sequestration enhancing coalbed methane recovery( CO_2_ECBM) is one of the important ways of CO_2 utilization.The underground storage and utilization of CO_2 can be realized,and recovery rate of coalbed methane can be improved by CO_2-ECBM.Affected by the complexity of coal seam geological conditions,CO_2 can't be completely sealed in coal seam after injection,and will gradually seep out with CBM drainage.The displacement of coal-bed methane containing CO_2 needs to be separated and removed before it could be transported to the pipeline network.Aiming at the production,composition and pressure conditions of displacement CBM,the adsorption characteristics of CO_2 and CH_4 on carbon molecular sieves were measured,and the equilibrium separation coefficients of CO_2/CH_4 were calculated.The separation and purification experiments of CO_2/CH_4 were carried out by pressure swing adsorption evaluation device,and the amount of adsorbent treated and the recovery of CH_4 were calculated.The results show that the adsorption of CO_2 and CH_4 on carbon molecule conforms to type I adsorption isotherm.The adsorption capacity of CO_2 is 1.27 mol/kg,the adsorption capacity of CH_4 is 0.48 mol/kg.The equilibrium separation coefficient of CO_2/CH_4 is 3.38,and the separation ratio of carbon molecular sieves is high,which is mainly based on the kinetic rate.CO_2 is got as adsorptive phase,CH_4 is got as non-adsorptive phase.With the condition of adsorption pressure of 600 k Pa,and adsorption time of 120 s,the concentration of CO_2 in the CO_2/CH_4 separation product gas was below 1% after pressure swing adsorption separation.With the condition of adsorption pressure of 500 k Pa,and adsorption time of 120 s,the concentration of CO_2 in the CO_2/CH_4 separation tail gas separation product gas was below 5% after pressure swing adsorption separation.The final product gas would be got with the mixing of the CO_2/CH_4 separated gas and the purified gas from the separation tail gas. CO_2/CH_4 is separated and purified by pressure swing adsorption,and the concentration of CO_2 in the product gas is below 1%.Taking 1 200 Nm~3/d of single well production as an example,treatment capacity of adsorbent per unit is about 100 Nm~3/h,and the recovery rate of CH_4 reaches 92.375%. The displaced CBM can be separated and purified by pressure swing adsorption to remove CO_2,and then transported to the pipeline network.

关键词(KeyWords): 煤层气;驱替;变压吸附;分离;提纯
coal-bed methane;displacement;pressure swing adsorption;separation;purification

Abstract:

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基金项目(Foundation): 国家重点研发计划资助项目(2018YFB0605604);; 国家科技重大专项资助项目(2016ZX05045-005);; 天地科技创新创业专项资金资助项目(2018-TDMS006)

作者(Author): 李雪飞;车永芳;郭昊乾;李小亮;
LI Xuefei;CHE Yongfang;GUO Haoqian;LI Xiaoliang;Coal Chemistry Branch of China Coal Research Institute;Beijing Key Laboratory of Coal Based Carbon Materials;State Key Laboratory of High Efficient Mining and Clean Utilization of Coal Resources;

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DOI: 10.13226/j.issn.1006-6772.F19082601

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