Research on micro mechanism and influence of hydrate-based methane-carbon dioxide replacement for realizing simultaneous clean energy exploitation and carbon emission reduction

New energy development and carbon emission reduction are two important issues of sustainable development for human beings. Hydrate-based methane - carbon dioxide (CH4CO2) replacement is the promising technology for it can realize CH4 production from natural gas hydrate (NGH) and CO2 capture and sequestration (CCS) in the strata simultaneously and stably. This work reported the micro mechanism and the influence of the hydrate-based CH4-CO2 replacement by differential scanning calorimetry (DSC) measurements and in situ Raman spectroscopy measurements. It was found the replacement is affected by the potential energy of destruction (E-ped) and the binding energy (E-b). The replacement happens only when the E(ped )is larger than the E-b. The concentration of CO2 around the hydrate is the controlling influence on the replacement. The higher the concentration of CO2, the greater the red, and the higher CH4 production efficiency. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

The hydrate-based CH4-CO2 replacement technology shows promising potential in methane production and CO2 capture and sequestration, with the replacement process being affected by the potential energy of destruction and binding energy. Additionally, the concentration of CO2 plays a controlling influence on the replacement process, with higher CO2 concentrations leading to greater methane production efficiency.