Extraction of CH4 gas from Natural Gas Hydrates (NGHs) while storing CO2 by CH4-CO2 replacement method is a promising technique for achieving CO2 emission reduction and CH4 production. However, improving the kinetics and enhancing the replacement efficiency is the fundamental issue for efficient CH4 production and CO2 safe sequestration, which have become the bottlenecks in NGH extraction. In this work, the CO2 replacement characteristics and kinetics process were further elucidated. The effects of small molecule gas (N2) and intermittent heating on the CO2 replacement were quantitatively investigated. And the enhancement mechanism of N2 and intermittent heating on CO2 replacement were deeply analyzed. The results show that as the proportion of N2 increases, the CH4 recovery rate gradually increases, but the CO2 sequestration rate exhibits a pattern of initial increase followed by a decrease. In addition, the intermittent application of heat has been shown to effectively enhance the replacement performance of pure CO2 in porous media. A thicker quasi-liquid layer forms when the temperature of hydrate reservoir approaches the freezing point, making it easier for CO2 gas to form hydrates. Additionally, when intermittent heating is combined with CO2 + N2 replacement, it results in a more significant promotion of CH4 recovery. 

Gas production from hydrates by CH4-CO2 replacement: Effect of N2 and intermittent heating

Evaluation of start-up characteristics for heat pipe-cooled nuclear reactor coupled with recuperated open-air Brayton cycle using hardware-in-the-loop

Efficiency and mass optimization for space nuclear power systems with closed Brayton cycle loops

Thermal-hydraulic characteristics analysis of unprotected accident and protection control strategy for helium-xenon cooled reactor system

The nuclear-solar hybrid system (NSHS) is regarded as a promising solution to meet the growing energy requirements of remote areas. Currently, design schemes and parametric analyses for small-scale application scenarios are still limited. This study has proposed an innovative transportable micro heat-pipe cooled nuclear reactor (HPR) coupled with a concentrating solar power (CSP) system to achieve flexible load regulation. First, a dynamic simulation model for the NSHS is established in the Simulink platform, considering turbomachine off-design characteristics and the power-load matching dispatch principle. Then, techno-economic analyses are carried out to explore the exergy and capital cost flow processes. The results reveal that the NSHS shows clear seasonal features with the highest load cover rate of 98.31 % in summer and the lowest of 73.82 % in winter. The total exergy effectiveness of the NSHS is 29.4 %, with an average electricity cover ratio of 88.67 % and a solar energy penetration ratio of 13.32 %. The calculated LCOE is 80.84 $/MWh, and the payback period is 3.62 years. The life cycle emission of the system is assessed as 10.23 g CO2 eq./kWh. Compared with the solar standalone system, the hybrid system with higher efficiency faces challenges in high-temperature resistance and thermal insulation. 

Techno-economic analysis and dynamic performance evaluation of an integrated green concept based on concentrating solar power and a transportable heat pipe-cooled nuclear reactor

System-component combined design and comprehensive evaluation of closed-air Brayton cycle

Correlation of phase equilibria for gas hydrates in organic inhibitor aqueous solutions within wide concentration range

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System-component combined design and comprehensive evaluation of closed-air Brayton cycle

Correlation of phase equilibria for gas hydrates in organic inhibitor aqueous solutions within wide concentration range