多次加压条件下L-Met和MWCNT促进剂对CO_(2)水合物生成的影响  

Effect of promoters L-Met and MWCNT on formation of CO_(2)hydrate under multiple-pressurizing conditions

作　　者：王英梅 滕亚栋[1,2,3] 王立瑾 刘杰 张鹏 WANG Yingmei;TENG Yadong;WANG Lijin;LIU Jie;ZHANG Peng(School of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,Gansu,China;Key Laboratory of Complementary Energy Supply System of Biomass and Solar Energy in Gansu Province,Lanzhou 730050,Gansu,China;Western Energy and Environment Research Center of Lanzhou University of Technology,Lanzhou 730050,Gansu,China;State Key Laboratory of Frozen Soil Engineering,Northwest Institute of Ecological Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,Gansu,China)

机构地区：[1]兰州理工大学能源与动力工程学院,甘肃兰州730050 [2]甘肃省生物质能与太阳能互补供能系统重点实验室,甘肃兰州730050 [3]兰州理工大学西部能源与环境研究中心,甘肃兰州730050 [4]中国科学院西北生态环境资源研究院冻土工程国家重点实验室,甘肃兰州730000

出　　处：《化工进展》2024年第12期7049-7058,共10页Chemical Industry and Engineering Progress

基　　金：甘肃省科技重大专项(22ZD6FA004);甘肃省中小企业创新基金(22CX3JA003);冻土工程国家重点实验室自主课题(SKLFSE-ZT-202103);国家自然科学基金(51906093);甘肃省杰出青年基金(22JR5RA222);甘肃省高等学校创新基金(2023A-030);广东省新能源和可再生能源研究开发与应用重点实验室开放基金(E239kf1201);国家自然科学基金(42276230)。

摘　　要：自工业革命以来,随着化石燃料被广泛应用,温室气体的排放不断增加,导致气候变化,引发国内外广泛关注。由于温室气体主要为CO_(2),因此近年新出现的废气中CO_(2)捕获、分离技术被广泛研究。其中,水合物法是一种新兴技术,其在应用中的突出问题是如何获得较快水合物生成速率与较高生成量。CO_(2)水合物快速生成需要高压气体条件,伴随水合物不断生成,系统内气体压力会持续下降,因此多次对反应加压使其恢复至初始压力是生成反应中常用方法。本研究选取L-蛋氨酸(L-Met)和多壁碳纳米管(MWCNT)两种典型动力学促进剂,采用多次加压至反应体系初始压力的方法,比较了此反应条件下不同促进剂对CO_(2)水合物生成反应动力学促进效果。实验结果表明,当反应体系初始压力反复恢复时,MWCNT和L-Met体系均能够显著减少水合物的诱导成核时间,而1.1g/L L-Met能够显著促进二氧化碳水合物的生成,水合物生成量是纯水体系的5倍;L-Met体系水合物生成速率优于MWCNT体系,1.1g/L L-Met气体转化率最高,转化率为70.3%,是纯水体系的6倍。最终实验结果表明,L-Met作为CO_(2)水合物动力学促进剂优于MWCNT,在水合物法捕集、分离烟道废气CO_(2)技术的规模化应用中,可用作一种高效、可靠、环保的动力学促进剂。Since the industrial revolution,greenhouse gas emissions have been increasing along with wide fossil fuels applications,which leads to significant global climate change and then a commonly-concerned subject focused by international researchers and governments.Because the main component of greenhouse gas is CO_(2),some novel technologies for CO_(2)capture and separation from flue gas have been widely studied during recent years,among which the hydrate method is an emerging one.However,the outstanding problem during its applications is how to obtain a faster rate and higher amount of hydrate formations.Rapid CO_(2)hydrate formation requires high-pressure gas conditions,but along with continuous hydrate formations,gas pressure in reaction system will continue declining.The initial pressure recovery of reaction system by multi-pressurizing is therefore a general method.In this study,two typical kinetic accelerators,L-methionine(L-Met)and multi-walled carbon nanotubes(MWCNT),were selected.And the kinetic promotion effects of them on formations of carbon dioxide hydrate were then compared under repeated recoveries of initial pressure conditions.The experimental results showed that when the initial pressure was repeatedly restored,MWCNT and L-Met system both significantly reduced the induced time of hydrate nucleating processes.L-Met with 1.1g/L concentration could significantly promote formation of carbon dioxide hydrates,and the formation amount of hydrate was 5 times that in pure water system.The hydrate formation rate in L-Met system was higher than that in MWCNT system.The conversion rate of gas in 1.1g/L L-Met system was the highest 70.3%,being 6 times that in pure water system.According to the final experimental results,L-Met was more superior than MWCNT as a carbon dioxide hydrate kinetic accelerator.It could be then used as an efficient,reliable and environmentally friendly kinetic accelerator during the large-scale application of hydrate-based technologies for CO_(2)capture and separation from flue gas.

关 键 词：二氧化碳水合物 多次加压 L-蛋氨酸 多壁碳纳米管 生成反应特征 

分 类 号：TE35[石油与天然气工程—油气田开发工程]