How Does Subcritical CO₂ Affect the Microstructure of Coal under Saturated Water Conditions at Different Temperatures?

Energy & Fuels, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 13, 2025

Injecting carbon dioxide (CO2) into coal seams enhances coalbed methane (CBM) recovery and promotes the CO2 geological sequestration. In this process, reservoir temperature plays a crucial role in interaction between coal. However, microstructural changes of at different saturation temperatures under subcritical (Sub CO2) conditions remain unclear. This study used scanning electron microscopy (SEM), low-temperature N2 adsorption, Fourier transform infrared spectroscopy (FTIR) to analyze bituminous anthracite's pore structure molecular various temperatures. The results indicate that after treatment, pores microfractures samples expanded significantly. Under medium high temperatures, number micropores anthracite increased significantly, while exhibited opposite trend. Additionally, content organic functional groups also changed aromaticity both coals with shortening aliphatic chains an elongation jointly influenced evolution micropore structures Analysis treated showed had higher sequestration, whereas was more suitable for CO2-enhanced recovery. These findings provide theoretical basis sequestration enhanced seam reservoirs.

Language: Английский

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2024, A Landmark Year for Climate Change and Global Carbon Capture, Utilization, and Storage: Annual Progress Review

Energy Science & Engineering, Journal Year: 2025, Volume and Issue: unknown

Published: April 4, 2025

ABSTRACT This annual review outlines the progress of carbon capture, utilization, and storage (CCUS) technologies in 2024. As human‐induced CO 2 emissions continued to rise, year presented critical challenges. Notably, 2024 was hottest on record first which global temperatures exceeded preindustrial levels by more than 1.5°C, driving intensified efforts advance CCUS. Scientific interest CCUS grew significantly, with number related publications increasing 11.4% compared 2023, reaching 53,970. The total operational commercial facilities also expanded, rising 16.3% a 50. In political area, governments introduced targeted policies accelerate adoption, focusing economic investment specific implementation requirements.

Language: Английский

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Experimental study on the effect of CO2 dynamic sequestration on sandstone pore structure and physical properties

Fuel, Journal Year: 2024, Volume and Issue: 375, P. 132622 - 132622

Published: Aug. 1, 2024

Language: Английский

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Experimental Study on the Effect of Co2 Dynamic Sequestration on Sandstone Pore Structure and Physical Properties

Published: Jan. 1, 2024

Tight sandstone reservoirs have huge potential for geological storage of CO2. In the process CO2 injection, stability and safety reservoir pore structure physical properties are basis storage. However, due to interaction between CO2-water-rocks, mineral composition can be affected, leading changes in rocks destabilizing under high-pressure environments. The distribution, rock surface microstructure, mechanical cores with different compositions treated carbonated water confining pressures were investigated through nuclear magnetic resonance (NMR), scanning electron microscopy (SEM), mechanics experiments. effects dynamic sequestration on tight analyzed. results demonstrate that following volume decreased generation debris by chemical dissolution plastic deformation was more significant high pressure, resulting closure a reduction space. Concurrently, gap-fillers, such as chlorite kaolinite, grains space occurred, formation microfractures. microfractures overall rock. Additionally, feldspar is easily dissolved chemically CO2-water conditions, this pronounced higher content. compressive strength elastic modulus these significantly reduced. Consequently, context storage, it recommended quartz content, low moderate porosity, stable physicochemical selected injection targets. Furthermore, phased strategy should employed accommodate structural pressure enhance efficiency, thereby optimizing long-term its safety.

Language: Английский

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Experimental study on coal oxidation and temperature rise under different air leakage modes due to atmospheric pressure changes

Energy Sources Part A Recovery Utilization and Environmental Effects, Journal Year: 2024, Volume and Issue: 46(1), P. 12950 - 12970

Published: Sept. 16, 2024

Language: Английский

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