摘要
水合物法二氧化碳封存是目前具有潜力的碳封存方式之一,将一定压力的CO_(2)气体注入冻土带的沉积层中,在特定的地层温度条件下CO_(2)气体可形成CO_(2)水合物从而达到长期稳定封存的目的。依据我国多年冻土地区地层的温压条件,选取冻土地区不同地层深度(110,150,200,250,300,350 m)对应的温度(0,1.27,2.72,4.53,6.38,8.70℃)进行了CO_(2)水合物封存实验。实验结果表明:在快速合成阶段实验温度为1.27℃下反应釜内温度上升幅度最大,生成速度最快,最终储气率最高,缓慢合成期持续时间随温度的升高而减少。在较低温度下(0和1.27℃)水合物的各相饱和度基本保持在约18%(水合物相)、15%(水相)和67%(气相)。在地层深度为150 m时(平均温度1.27℃)封存CO_(2)效果优于其他深度的地层。
CO_(2) hydrate sequestration is currently one of the potential carbon sequestration methods.CO_(2) gas with a certain pressure was injected into the sediment layer of the permafrost district and formed CO_(2) hydrate to achieve the purpose of long-term stable storage under specific temperature and pressure conditions.According to the temperature and pressure conditions in the permafrost districts in China,different layer depths(110,150,200,250,300 and 350 m)and corresponding temperatures(0,1.27,2.72,4.53,6.38 and 8.70℃)were selected to conduct CO_(2) hydrate storage experiments.The results show that the temperature in the reactor increases the most,the formation rate is the fastest in the rapid formation stage,the final gas storage rate is the highest when the experimental temperature is 1.27℃.However,the duration of the slow formation stage decreases with increasing temperature.The saturation of each phase of hydrate at lower temperatures(0 and 1.27℃)remains essentially at about 18%(hydrate phase),15%(water phase)and 67%(gas phase).When the depth of the permafrost sediment layer is 150 m(with an average temperature of 1.27℃),the CO_(2) storage effect is better than that of other depths.
作者
侯斌
赵建忠
高强
张驰
HOU Bin;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 Province,China;National Center for International Research on Deep Earth Drilling and Resource Development,Ministry of Science and Technology,China University of Geosciences(Wuhan),Wuhan 430074,Hubei Province,China)
出处
《化学工程》
CAS
CSCD
北大核心
2023年第8期1-6,共6页
Chemical Engineering(China)
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)。
关键词
碳封存
CO_(2)
水合物
储气率
carbon sequestration
CO_(2)
hydrate
gas storage rate
