油田含CO_2伴生气变压吸附材料实验研究
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摘要
变压吸附工艺是国内小规模CO_2驱产出气处置的常用手段,而吸附剂是吸附分离的基础。选用6种沸石类吸附剂,测试了CO_2/CH4单组分吸附平衡等温线,分析了温度对吸附量的影响。优选了两种材料进行了CO_2-CH4混合气体竞争吸附实验,重点分析了温度、压力、气体组分、CO_2含量等因素对吸附剂吸附分离效果的影响,评价了油、水含量对吸附剂的损伤。实验结果表明:吸附剂的分离系数与混合气体中CO_2含量无明显相关性,但吸附体系压力的变化对混合气体分离效果影响较大。在初始气体CO_2摩尔分数50%、温度20℃、压力2.5MPa条件下,优选的吸附剂13X对混合气体的分离系数为25。油水的存在会对吸附剂的分离性能产生较大影响,在温度20℃、压力2.5 MPa、13X吸附剂含水摩尔分数10%及含油摩尔分数10%条件下,吸附总量分别下降32%和78%,分离系数分别下降48%和78%。
Pressure swing adsorption(PSA)process is a common method to disposal CO_2-flooding produced gas,and the adsorbent is the basis of adsorption separation.In this paper,six kinds of adsorbents are selected to measure the adsorption equilibrium isotherms of CO_2 and CH4,and the influences of temperature are analyzed.Two zeolites with excellent separation performance have been used for subsequent experiments about CO_2-CH4 binary adsorption equilibrium.The influences of various factors,such as temperature,pressure,gas composition,and CO_2 content on the CO_2 separation performance are analyzed.Moreover,the damage rate of the moisture and oil content to the adsorbent are also evaluated.The experimental results show that the selectivity of 13 Xhas no obvious correlation with CO_2 content in the mixture gas,but the system pressure has a great effect on the separation performance.Under the condition with a CO_2 content of 50%,a temperature of 20 ℃ and apressure of 2.5 MPa,the selectivity of 13 Xfor the mixed gas is 25.The moisture and oil content can tremendously weaken separation performance of zeolites.At 20 ℃ and 2.5 MPa,10% of water content and 10% of oil content can decrease the adsorption amount of 13 X by 32% and 78% respectively,and the selectivity of 13 Xwill decrease 48% and 78%respectively.
Pressure swing adsorption(PSA)process is a common method to disposal CO_2-flooding produced gas,and the adsorbent is the basis of adsorption separation.In this paper,six kinds of adsorbents are selected to measure the adsorption equilibrium isotherms of CO_2 and CH4,and the influences of temperature are analyzed.Two zeolites with excellent separation performance have been used for subsequent experiments about CO_2-CH4 binary adsorption equilibrium.The influences of various factors,such as temperature,pressure,gas composition,and CO_2 content on the CO_2 separation performance are analyzed.Moreover,the damage rate of the moisture and oil content to the adsorbent are also evaluated.The experimental results show that the selectivity of 13 Xhas no obvious correlation with CO_2 content in the mixture gas,but the system pressure has a great effect on the separation performance.Under the condition with a CO_2 content of 50%,a temperature of 20 ℃ and apressure of 2.5 MPa,the selectivity of 13 Xfor the mixed gas is 25.The moisture and oil content can tremendously weaken separation performance of zeolites.At 20 ℃ and 2.5 MPa,10% of water content and 10% of oil content can decrease the adsorption amount of 13 X by 32% and 78% respectively,and the selectivity of 13 Xwill decrease 48% and 78%respectively.
引文
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[18]LING J,NTIAMOAH A,XIAO P,et al.Overview of CO2capture from flue gas streams by vacuum pressure swing adsorption technology[J].Austin Journal of Chemical Engineering,2014,1(2):2-7.
[2]任韶然,张莉,张亮.CO2地质埋存:国外示范工程及其对中国的启示[J].中国石油大学学报(自然科学版),2010,34(1):93-98.
[3]马涛,汤达祯,蒋平,等.注CO2提高采收率技术现状[J].油田化学,2007,24(4):379-383.
[4]李向良.二氧化碳驱油藏产出气回注的可行性及其对驱油效果的影响[J].油气地质与采收率,2016,23(3):72-76.
[5]周德彪.EOR采出气CO2分离工艺模拟研究[D].青岛:青岛科技大学,2014.
[6]杨海燕.分离CH4/CO2的吸附剂研究[D].哈尔滨:东北农业大学,2013.
[7]沈文龙,李嘉旭,杨颖,等.基于沸石ZSM-5的CH4/N2/CO2二元体系吸附平衡[J].化工学报,2014,65(9):3490-3498.
[8]刘伟,孙林兵,刘晓勤.C2H4/CO2混合体系在活性炭上吸附的实验与模型[J].高校化学工程学报,2012,26(1):25-30.
[9]刘宝林.低温变压吸附脱除天然气中二氧化碳实验研究[D].大连:大连理工大学,2015.
[10]陆江园,刘伟,孙林兵,等.CH4/CO2混合组分在13X分子筛上的吸附平衡及分离性能[J].高校化学工程学报,2013,27(1):1-6.
[11]李通,罗仕忠,吴永永,等.活性炭改性及其对CO2/CH4吸附性能的研究[J].煤炭学报,2011,36(12):2012-2017.
[12]LIU D,YI H,TANG X,et al.Adsorption separation of CO2/CH4gas mixture on carbon molecular sieves modified by potassium carbonate[J].Journal of Chemical&Engineering Data,2016,61(7):2197-2201.
[13]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):43-46.
[14]CAVENATI S,AND C A G,RODRIGUES A E.Adsorption equilibrium of methane,carbon dioxide,and Nitrogen on zeolite13Xat high pressures[J].Journal of Chemical&Engineering Data,2004,49(4):1095-1101.
[15]GAO Y,ZHOU J,SHENG H B,et al.Adsorptive separation of CO2/CH4gas mixtures with zeolite molecular sieve[J].Xiandai Huagong/modern Chemical Industry,2014,34(9):50-54.
[16]HO M T,ALLINSON G W,WILEY D E.Reducing the cost of CO2capture from flue gases using pressure swing adsorption[J].Industrial&Engineering Chemistry Research,2008,47(14):1562-1568.
[17]PIRNGRUBER G D,LEINEKUGELLECOCQ D.Design of a pressure swing adsorption process for post-combustion CO2capture[J].Industrial&Engineering Chemistry Research,2013,52(17):5985-5996.
[18]LING J,NTIAMOAH A,XIAO P,et al.Overview of CO2capture from flue gas streams by vacuum pressure swing adsorption technology[J].Austin Journal of Chemical Engineering,2014,1(2):2-7.