不同分解压力下L-Met浓度对CO_(2)水合物稳定性影响研究  

Study on the influence of L-methionine concentrations on carbon dioxide hydrate stability under different decomposition pressures

作　　者：王英梅[1] 王立瑾 滕亚栋 姜雪晨 张鹏 WANG Yingmei;WANG Lijin;TENG Yadong;JIANG Xuechen;ZHANG Peng(Department of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,China;State Key Laboratory of Permafrost Engineering,Northwest Academy of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China)

机构地区：[1]兰州理工大学能源与动力工程系,甘肃兰州730050 [2]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：《地学前缘》2025年第2期195-205,共11页Earth Science Frontiers

基　　金：国家自然科学基金项目(41661103,41601079);国家重点研发计划项目(2017YFC0307303);甘肃省科技重大专项项目(22ZD6FA004);甘肃省中小企业创新基金项目(22CX3JA003)。

摘　　要：在当前能源需求和“双碳”的大背景下,利用添加促进剂的水合物法储存CO_(2)受到广泛关注,而促进剂的使用对CO_(2)水合物的各项性能影响不同。因此本文以硅胶为多孔介质,以3.0 MPa、274.15 K为初始生成条件,对比分析了分解温度为275.15 K条件下,分解压力分别为0、0.5、1 MPa时纯水体系和不同浓度(0.8、0.9、1.0、1.1、1.2 g/L)的L蛋氨酸(L-Met)体系对CO_(2)水合物稳定性的影响。结果表明:在0 MPa分解压力下1.1 g/L L-Met体系中的CO_(2)水合物稳定性最好,分解压力为0.5 MPa和1 MPa时,0.9 g/L L-Met体系中水合物均表现出最好的稳定性,有利于水合物的稳定储存。除了研究L-Met浓度对稳定性的影响外,还分析了分解压力对水合物分解的影响。研究发现在纯水体系中,分解压力为0 MPa时水合物分解速率表现为先增大后减小,而其余分解压力条件下均在初始时刻具有最大分解速率,呈现单调递减趋势;同时发现除0.8 g/L L-Met体系外,其他体系在常压下分解初期时水合物分解速率均是先增大后减小,具有水合物的“自保护”效应,而在0.5 MPa和1 MPa压力下,只在初始时刻具有最大的分解速率,呈现单调减小的趋势,对上述效应具有破坏作用。通过上述研究,为CO_(2)水合物的长距离运输和长时间储存提供数据及理论支撑。The storage of carbon dioxide(CO_(2))hydrate using promoters has garnered significant attention in the context of increasing energy demand and the“dual carbon”goals.However,different promoters exhibit varying effects on the properties of CO_(2) hydrate.This study investigates the formation and stability of CO_(2) hydrate using silica gel as a porous medium under initial formation conditions of 3.0 MPa and 274.15 K,followed by decomposition at 275.15 K.The effects of decomposition pressures(0,0.5,and 1 MPa)on the stability of CO_(2) hydrate were analyzed in systems containing pure water and L-Met(L-methionine)solutions at concentrations of 0.8,0.9,1.0,1.1,and 1.2 g/L.The results show that the CO_(2) hydrate in the 1.1 g/L L-Met solution exhibits the highest stability at a decomposition pressure of 0 MPa.The 0.9 g/L L-Met solution provides the best hydrate stability at decomposition pressures of 0.5 MPa and 1 MPa,which is favorable for stable hydrate storage.In addition to analyzing the influence of L-Met concentrations on hydrate stability,the effect of decomposition pressure on hydrate dissociation rates was also studied.In the pure water system,the dissociation rate initially increases and then decreases under a decomposition pressure of 0 MPa.For all other decomposition pressures,the maximum dissociation rate occurs at the initial stage,followed by a monotonic decrease.Furthermore,in L-Met systems,except for the 0.8 g/L concentration,the dissociation rate of hydrate under atmospheric pressure(0 MPa)initially increases and then decreases,demonstrating the“self-protection”effect of hydrate.However,the dissociation rate reaches its maximum at the initial moment and monotonically decreases at decomposition pressures of 0.5 MPa and 1 MPa,indicating that higher pressures undermine the self-protection effect.This study provides insights into the effects of promoter concentration and decomposition pressure on the stability and dissociation behavior of CO_(2) hydrate,contributing to advancements in hydrate-based

关 键 词：CO_(2)水合物 硅胶 L-Met 分解压力 稳定性 

分 类 号：P744.4[天文地球—海洋科学] P599