Experimental and modelling studies on combined pyrolysis and gasification of large coal particle in steam and CO2 ambience

Prabhakar, Ashok; Sadhukhan, Anup Kumar; Gupta, Parthapratim

doi:10.1007/s11696-021-01508-y

Cited by 3 publications

(2 citation statements)

References 35 publications

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“…Although most of these measures can increase coal permeability in the initial stage, but enhancement effect is significantly reduced in the later stage 9 . Especially for “three–soft” coal seams, the fracture network formed by the conventional enhancement measures easily closed and disappeared under the crustal stress action, thus limiting the improvement of CBM recovery 10–12 . Therefore, it is crucial to address the issue of how to improve coal permeability and CBM recovery.…”

Section: Introductionmentioning

confidence: 99%

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Modeling and coupling analysis of enhanced coalbed methane recovery by gas injection

Zhang,

Jiang,

et al. 2024

Num Anal Meth Geomechanics

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Enhanced coalbed methane (ECBM) recovery by gas injection is regarded as a feasible method for ECBM recovery. To investigate the mechanism of CH4 displacement by N2 injection, a series of physical experiments were conducted in the laboratory under different N2 injection pressures. The experimental results showed a continuous increase in the N2 volume fraction and a decrease in the CH4 volume fraction with the N2 injection pressure. The CH4 displacement efficiency increases rapidly in the initial stage and then gradually stabilizes. Given the effect of matrix shrinkage and effective stress on coal permeability, a dynamic multi‐field coupling model of ECBM recovery by N2 injection (N2‐ECBM) was proposed in this work. Then, numerical simulations were implemented by the coupling model to analyze the key factors affecting coal permeability, N2 injection pressure and CH4 pressure during the N2–ECBM process. Furthermore, the Response Surface Methodology (RSM) was used to investigate the interactions of multiple factors, the results reveal that an increase in one factor would weaken the influence of another factor. In addition, a RSM regression model was obtained and verified by the experimental data, with a well‐fitting outcomes. Therefore, the RSM model can be used in practical engineering applications to optimize specific extraction parameters for ECBM recovery at minimum cost in a limited extraction period.

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Section: Introductionmentioning

confidence: 99%

“…9 Especially for "three-soft" coal seams, the fracture network formed by the conventional enhancement measures easily closed and disappeared under the crustal stress action, thus limiting the improvement of CBM recovery. [10][11][12] Therefore, it is crucial to address the issue of how to improve coal permeability and CBM recovery.…”

mentioning

confidence: 99%