The microstructure of lignite and the seepage movement characteristics of ionic liquid solutions using 3D X-ray CT reconstruction

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2025-03-08 DOI:10.1016/j.powtec.2025.120884

Zijian Liu , Xi Chen , Jihai Chen , Shaocheng Ge , Qiucheng Deng , Haoru Li

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Abstract

For the difficulty of wetting coal seams through water injection, it is valuable to investigate the microscopic impact of ionic liquid solutions on the seepage process during water injection in coal seams. In this study, a 7 × 7 × 10 mm lignite sample was scanned using 3D X-ray CT technology. The coal structure was reconstructed using Avizo software, and subsequently, the seepage characteristics of water and ionic liquid solutions within the coal pore network were simulated using Comsol software in a region of 250 × 250 × 250 μm. The seepage simulation showed that when the pressure was constant, the pore and fracture network of the coal body exhibited significant anisotropy, and the water flow has different velocities in each direction. Specifically, the seepage velocity in the vertical direction (Z-axis) was 130 % and 11 % higher than that in the X- and Y-axes, respectively. By comparing the flow of water and ionic liquid solutions in the vertical direction (Z-axis), [BMIm][BF4] demonstrated the best seepage capability, and the low concentration range of 2 to 4 wt% was more conducive to the seepage movement of ionic liquids in coal. Moreover, simple pressurization could not effectively improve the seepage effect. Meanwhile, the wetting capability of ionic liquid solutions was not related to their seepage capability.

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.