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
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;
Email:
DOI: 10.13226/j.issn.1006-6772.F19082601
参考文献(References):
- [1]胡永乐,郝明强,陈国利,等.中国CO2驱油与埋存技术及实践[J].石油勘探与开发,2019,46(4):716-727.HU Yongle,HAO Mingqiang,CHEN Guoli,et al.Technologies and practice of CO2flooding and sequestration in China[J].Petroleum Exploration and Development,2019,46(4):716-727.
- [2]贾凯锋,计董超,高金栋,等.低渗透油藏CO2驱油提高原油采收率研究现状[J].非常规油气,2019,6(1):107-115.JIA Kaifeng,JI Dongchao,GAO Jindong,et al.The exisiting state of enhanced oil recovery by CO2flooding in low permeability reservoirs[J].Unconventonal Oil&Gas,2019,6(1):107-115.
- [3]桑树勋.二氧化碳地质存储与煤层气强化开发有效性研究述评[J].煤田地质与勘探,2018,48(5):1-9.SANG Shuxun.Research review on technical effectiveness of CO2geological storage and enhanced coalbed methane recovery[J].Coal Geology&Exploration,2018,48(5):1-9.
- [4]吕玉民,汤达祯,许浩,等.提高煤层气采收率的CO2埋存技术[J].环境科学与技术,2011,34(5):95-99.LYU Yumin,TANG Dazhen,XU Hao,et al.CO2sequestration enhancing coalbed methane recovery[J].Environmental Science&Technology,2011,34(5):95-99.
- [5]张文东,唐书恒,张松航,等.基于CCUS的深部煤层煤层气采收及CO2封存效果[J].煤炭科学技术,2014,42(8):33-37.ZHANG Wendong,TANG Shuheng,ZHANG Songhang,et al.Effect of coalbed methane recovery and CO2storage in deep seam based on CCUS[J].Coal Science and Technology,2014,42(8):33-37.
- [6]魏小芳,罗一箐,刘可禹,等.油气藏埋存二氧化碳生物转化甲烷的机理和应用研究进展[J].地球科学进展,2011,26(5):499-506.WEI Xiaofang,LUO Yijing,LIU Keyu,et al.Advances in mechanism and application of bioconversion of methane from carbon dioxide in oil and gas reservoirs[J].Advances in Earth Science,2011,26(5):499-506.
- [7]孙晓博.油藏CO2生物固定及转化产CH4功能基因多样性及体系构建的研究[D].上海:华东理工大学,2013.SUN Xiaobo.Study of original microbial community in different oil reservoirs and construction of experimental system with repect to biofixation and bioconversion of CO2into CH4by using functional genes[D].Shanghai:East China University of Science and Technology,2013.
- [8]高鹏,崔勖,钟良枢,等.CO/CO2加氢高选择性合成化学品和液体燃料[J].化工进展,2019,38(1):183-195.GAO Peng,CUI Xu,ZHONG Liangshu,et al.CO/CO2hydrogenation to chemicals and liquid fuels with high selectivity[J].Chemical Industry and Engineering Progress,2019,38(1):183-195.
- [9]王野.二氧化碳直接高选择性合成液体燃料[J].物理化学学报,2017,33(12):2319-2320.WANG Ye.Direct conversion of CO2into liquid fuels with high selectivity[J].Acta Physico-Chimica Sinica,2017,33 (12):2319-2320.
- [10]刘学武,杜宝国,武锦涛,等.椰壳活性炭低温变压吸附天然气中CO2/CH4实验[J].吉首大学学报(自然科学版),2016,37(2):43-47.LIU Xuewu,DU Baoguo,WU Jintao,et al.Low temperature pressure swing adsorption of CO2/CH4from natural gas by coconut shell activated carbon[J].Journal of Jishou University(Natural Science Edition),2016,37(2):43-47.
- [11]张云霞,张存泉.吸附处理煤层气中去除二氧化碳的数值模拟[J].低温与特气,2011,29(6):26-31.ZHANG Yunxia,ZHANG Cunquan.Numerical simulation on removal of carbon dioxide in coal-bed gas with adsorption processing method[J].Low Temperature and Specialty Gases,2011,29(6):26-31.
- [12]曾国治,王睿,库尔,等.5A沸石分子筛低温变压吸附CO2/CH4实验研究[J].广州化工,2019,47(10):26-31.ZENG Guozhi,WANG Rui,KU Er,et al.Experimental study on CO2/CH4adsorption of 5A zeolite at low temperature pressure swing[J].Guangzhou Chemical Industry,2019,47(10):26-31.
- [13]陈敏玲,王兴杰,肖静,等.淀粉基多孔碳材料的制备及其吸附CO2/CH4性能[J].化工学报,2018,69(1):455-463.CHEN Minling,WANG Xingjie,XIAO Jing,et al.Preparation of porous carbon material from starch and it's performance for separation of CO2/CH4[J].Journal of Chemical Industry and Engineering,2018,69(1):455-463.
- [14]李雪飞,郭昊乾.甲烷与二氧化碳混合气分离试验研究[J].洁净煤技术,2018,24(3):35-39.LI Xuefei,GUO Haoqian.Experimental study on CH4and CO2mixture separation[J].Clean Coal Technology,2018,24(3):35-39.
- [15]凌凡,张忠孝,樊俊杰,等.膜分离法、化学吸收法以及联合法分离CO2/CH4试验比较[J].动力工程学报,2015,35 (3):245-250.LING Fan,ZHANG Zhongxiao,FAN Junjie,et al.Experimental study on CO2/CH4separation respectively by membrane,chemical and combined method[J].Journal of Chinese Society of Power Engineering,2015,35(3):245-250.
- [16]郭瑞乾,张萌,罗居杰,等.酸化多壁碳纳米管/含氟聚砜复合膜的制备及其对CO2/CH4分离性能研究[J].化工新型材料,2017,45(1):79-82.GUO Ruiqian,ZHANG Meng,LUO Jujie,et al.Fabrication of AT-MWCNT/polysulfone containing fluorine composite membrane for CO2/CH4separation[J].New Chemical Materials,2017,45(1):79-82.
- [17]龚金华,王臣辉,卞子君,等.多孔材料表面修饰聚酰亚胺非对称混合基质膜对CO2/N2和CO2/CH4的气体分离[J].物理化学学报,2015,31(10):1963-1970.GONG Jinhua,WANG Chenhui,BIAN Zijun,et al.Asymmetric polyimide mixed matrix membranes with porous materialsmodified surfaces for CO2/N2and CO2/CH4separations[J].Acta Physico-Chimica Sinica,2015,31(10):1963-1970.
- [18]钟栋梁,何双毅,严瑾,等.低甲烷浓度煤层气的水合物法提纯实验[J].集输与加工,2014,34(8):123-128.ZHONG Dongliang,HE Shuangyi,YAN Jin,et al.An experimental study of using hydrate formation to enhance the methane recovery of low-concentration CBM[J].Natural Gas Industry,2014,34(8):123-128.
- [19]吴强.煤矿瓦斯水合化分离试验研究进展[J].煤炭科学技术,2014,42(6):81-85.WU Qiang.Research progress of separation experiment of mine gas hydrate[J].Coal Science and Technology,2014,42(6):81-85.
- [20]高霞,刘文新,高橙,等.含瓦斯水合物煤体强度特性三轴试验研究[J].煤炭学报,2015,40(12):2829-2835.GAO Xia,LIU Wenxin,GAO Cheng,et al.Triaxial shear strength of methane hydrate-bearing coal[J].Journal of China Coal Society,2015,40(12):2829-2835.
- [21]张保勇,程远平,吴强,等.TBAB溶液中高浓度CO2瓦斯水合分离效果试验[J].煤炭科学技术,2014,42(3):45-48,92.ZHANG Baoyong,CHENG Yuanping,WU Qiang,et al.Experiment on hydrate separation effect of high CO2gas in TBAB solution[J].Coal Science and Technology,2014,42(3):45-48,92.
- [22]王骏成,胡明振,孙林兵,等.碳分子筛变压吸附提纯沼气的性能[J].化工进展,2015,34(9):3452-3455,3486.WANG Juncheng,HU mingzhen,SUN linbing,et al.Biogas purification using carbon molecular sieves by pressure swing adsorption[J].Chemical Industry and Engineering Progress,2015,34(9):3452-3455,3486.
- [23]黄知坤,文炜.脉动流变压吸附分离CH4/CO2实验研究[J].化学工程与装备,2020(1):21-23.HUANG Zhikun,WEN wei.Experimental study on separation of CH4/CO2by pulsating flow pressure adsorption[J].Chemical Engineering&Equipment,2020(1):21-23.
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- 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
- 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