活性炭+THF溶液体系中CO_(2)水合物生成特性研究  

Study on characteristics of CO_(2) hydrate formation in activated carbon+THF solution system

作　　者：邝若谷 吴良猛 谢凤梅 钟栋梁[1] KUANG Ruogu;WU Liangmeng;XIE Fengmei;ZHONG Dongliang(State Key Laboratory of Coal Mine Disaster Dynamics and Control,School of Resources and Safety Engineering,Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆大学煤矿灾害动力学与控制全国重点实验室,资源与安全学院,重庆400044

出　　处：《低碳化学与化工》2023年第5期109-114,134,共7页Low-Carbon Chemistry and Chemical Engineering

基　　金：国家自然科学基金(52076019);重庆市自然科学基金创新发展联合基金(CSTB2022NSCQ-LZX0030)。

摘　　要：水合物法捕集CO_(2)具有储气量大、生成条件温和等显著优点,应用前景广阔。提高水合物生成速率和CO_(2)气体消耗量是该方法需解决的关键问题。在活性炭+THF溶液体系中开展了CO_(2)水合物生成特性研究,探究了THF溶液浓度(物质的量分数,下同)、THF溶液饱和度对CO_(2)气体消耗量的影响,并通过可视显微实验研究了活性炭+THF溶液体系中CO_(2)水合物的生长形貌特征。研究结果表明,相比于THF溶液浓度为5.56%的体系,活性炭+THF溶液体系(THF溶液浓度为5.56%、溶液饱和度为100%)的CO_(2)气体消耗量增加了59%;当THF溶液饱和度为100%时,提高THF溶液浓度可以有效促进水合物生长,在THF溶液浓度为5.56%的条件下,CO_(2)气体消耗量达到总CO_(2)气体消耗量90%所需的时间(t90)最短(106.67min)。活性炭+THF溶液体系中的CO_(2)水合反应由气体吸附和水合物生长两个阶段组成,水合物最初形成于活性炭颗粒/溶液界面并逐渐填充活性炭颗粒间隙;当THF溶液浓度为5.56%时,CO_(2)气体消耗量随THF溶液饱和度增加而降低,在THF溶液饱和度为40%的条件下的CO_(2)气体消耗量最大,对应的t90最短(23.5min)。The gas hydrate-based technology has been recognized as a promising technology for CO_(2) capture.It has the advantages of large gas storage capacity,mild formation conditions,and so on.Increasing hydrate formation rate and CO_(2) gas consumption are critical issues that need to be solved.The formation characteristics of CO_(2) hydrate in the activated carbon+THF solution system were studied.The effects of THF solution concentration(mole fraction,the same below)and THF solution saturation on CO_(2) gas consumption were explored.In addition,the growth morphology of CO_(2) hydrate formation in the activated carbon+THF solution system was investigated through the visual microscopic experiment.The results show that,compared with the system with the THF solution concentration of 5.56%,CO_(2) gas consumption obtained in the activated carbon+THF solution system(THF solution concentration is 5.56%,THF solution saturation is 100%)is increased by 59%.When the THF solution saturation is 100%,hydrate growth is found to be promoted with the increase of THF solution concentration.The time required for CO_(2) gas consumption to reach 90%of the total CO_(2) gas consumption(t90)is the shortest(106.67 min)with THF solution concentration is 5.56%.CO_(2) hydrate formation in the activated carbon+THF solution system is composed of the two stages of CO_(2) adsorption and CO_(2) hydrate formation.CO_(2) hydrate initially forms form at the interface of activated carbons particles and solution,and then gradually fills the interstitial spaces of the activated carbon particles.When the THF concentration is 5.56%,CO_(2) gas consumption decreased with the increase of THF solution saturation.The CO_(2) gas consumption is the largest under the condition of THF solution saturation 40%,and the corresponding t90 is the shortest(23.5 min).

关 键 词：气体水合物 CO_(2)捕集 吸附-水合耦合法 THF溶液 活性炭 

分 类 号：TE991.1[石油与天然气工程—石油机械设备]