摘要
在非常规天然气以及天然气水合物二氧化碳(CO_(2))置换开采过程中,明确CO_(2)/CH_(4)混合气体水合物(以下简称“CO_(2)/CH_(4)水合物”)的合成和分解机理,对水合物法分离混合气体、CO_(2)封存与CH_(4)高效开采有重要意义。以多孔介质+去离子水体系中的CO_(2)/CH_(4)水合物为研究对象,进行了二次合成和分解实验,研究了分解时间为0.5 h、分解温度为5~25℃条件下的记忆效应对CH_(4)/CO_(2)水合物合成的影响,主要从二次合成诱导期、气体消耗量和消耗速率,以及各组分气体消耗情况3个方面进行了分析。结果表明,分解温度越低,二次合成诱导期越短;记忆效应降低了二次合成速率;当分解温度为10℃时二次合成速率最快,气体消耗速率峰值为8.10 mmol/min;在相同的合成温度和压力下,升温分解后的记忆效应使二次合成时CO_(2)水合物合成量提高至初次合成量的1.3倍,而对CH_(4)水合物合成量基本没有影响,即记忆效应对不同客体分子的影响有所差别。该研究为记忆效应在水合物技术中的应用提供了参考。
In the process of unconventional natural gas and carbon dioxide(CO_(2)) replacement extraction of natural gas hydrate,it is important to clarify the synthesis and decomposition mechanism of CO_(2)/CH_(4) mixed gas hydrate(hereinafter referred to as “CO_(2)/CH_(4) hydrate”) for the separation of mixed gas,CO_(2) sequestration and efficient CH_(4) extraction by hydrate method.The secondary synthesis and decomposition experiments of CO_(2)/CH_(4) hydrate in porous media+deionized water system were carried out to study the effect of memory effect on the synthesis of CO_(2)/CH_(4) hydrate under the decomposition time of 0.5 h and the decomposition temperature of 5℃ to 25℃.The secondary synthesis induction period,gas consumption and consumption rate,and gas consumption of each component were mainly analyzed.The results show that the induction period of secondary synthesis become shorter when the decomposition temperature is lower.The memory effect reduces the rate of secondary synthesis.The fastest rate of secondary synthesis is achieved when the decomposition temperature is 10℃,and the peak gas consumption rate is 8.10 mmol/min.Under the same synthesis temperature and pressure,the memory effect after heating decomposition increases the synthesis amount of CO_(2) hydrate to 1.3 times that of the primary synthesis amount during the secondary synthesis,but has no effect on the synthesis amount of CH_(4) hydrate,that is,the effect of memory effect on different guest molecules is different.This study provides a reference for the application of memory effect in hydrate technology.
作者
管建
赵建忠
高强
张驰
GUAN Jian;ZHAO Jianzhong;GAO Qiang;ZHANG Chi(Key Laboratory of In-situ Property-improving Mining of Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China;National Center for International Research on Deep Earth Drilling and Resource Development,Faculty of Engineering,China University of Geosciences(Wuhan),Wuhan 430074,Hubei,China)
出处
《低碳化学与化工》
CAS
北大核心
2023年第4期154-161,共8页
Low-Carbon Chemistry and Chemical Engineering
基金
科技部地球深部钻探与深地资源开发国际联合研究中心项目(DEDRD-2022-05)
博士后面上71批基金(2022M712337)
山西省回国留学人员科研资助项目(2020-046)。
