This paper focuses on the progress of CO2 marine sequestration,with a particular emphasis on the current state for CO2 hydrate sub-seabed sequestration and the CH4 displacement in natural gas hydrates by CO2.Firstly,the fundamental principles and formation conditions of CO2 hydrate marine sequestration technology are discussed,along with an in-depth analysis of the influence of inorganic salt concentration in seawater and sediment porosity on the formation kinetics of CO2 hydrates.Secondly,factors affecting CO2 displacement in natural gas hydrates are further explored,including temperature,pressure conditions,mixture gas and seabed sediment.Finally,the challenges and issues in the technical and environmental aspects of CO2 ocean sequestration are discussed,and the urgency and application prospects for the development of CO2 sequestration technology are also prospected.
关键词
CO2海洋封存/水合物利用技术/CO2水合物/天然气水合物/CO2置换法
Key words
ocean sequestration/hydrates technology/CO2 hydrates/natural gas hydrates/CO2 displacement method
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