Combined control of fluid adsorption capacity and initial permeability on coal permeability

Wei, Jianping; Wei, Guoying; Wu, Caifang; Cao, Lei; Ni, Xiaoming

doi:10.1007/s40789-022-00545-6

Cited by 9 publications

(3 citation statements)

References 35 publications

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“…According to Tables 2 and 3, the three wastewaters that promote slurryability all contain high COD; the composition of organic compounds in these wastewater is complex, including phenols, alcohols, urethanes and erucamides, and so forth. [ 16 ] Except for ammonia nitrogen, all other indicators of carbonization wastewater components are lower. To further explore the mechanism of different wastewaters on the slurryability of CWS, the method of simulating wastewater to prepare CWS was used to investigate the influence of the organic matter, metal ions, and ammonia nitrogen in wastewater on slurryability in this paper.…”

Section: Resultsmentioning

confidence: 99%

Study on the slurrying mechanism of coal water slurry prepared from coal gasification wastewater

Feng

et al. 2023

Can J Chem Eng

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The coal gasification process produces a large amount of wastewater which is seriously polluted and difficult to biochemically treat. The regasification of coal water slurry produced from gasification wastewater meets the requirements of clean and efficient use of energy and the concept of circular economy. In this paper, the slurryability of coal water slurry prepared with gasification wastewater was measured, and the influence mechanism of organic matter, metal ions, and ammonia nitrogen components in coal gasification wastewater on slurryability has been studied. Results show that (a) Coal water slurry can be prepared with gasification wastewater, and the composition of wastewater has a great influence on the slurryability. (b) Phenols and alcohols in wastewater are not conducive to slurryability, while urethane in wastewater is beneficial for slurrying. (c) K+ and Na+ in wastewater have little effect on the slurryablity even in high concentration, while Mg2+ and Ca2+ have basically no effect on the slurryability under the concentration range of coal gasification wastewater. However, Fe3+ has a negative effect and Cu3+ has a positive effect on the slurryability at low concentrations. (d) Ammonia nitrogen can affect the slurryability of coal water slurry by affecting the pH of the solution. NH4OH solution is alkaline, which is conducive to slurrying, while (NH4)2SO4 and NH4Cl solutions are acidic, resulting in poor slurryability of coal water slurry.

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Section: Resultsmentioning

confidence: 99%

Study on the slurrying mechanism of coal water slurry prepared from coal gasification wastewater

Feng

et al. 2023

Can J Chem Eng

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“…Permeability is a key parameter to measure the permeability performance of soil an rock mass [34][35][36], and it is an important indicator to evaluate the aquitard of the spo field [37]. In this MSWC permeability test, the inlet pressure decay method was used Compared with other methods, the inlet pressure decay method has a smaller error, highe accuracy, and more convenient calculation.…”

Section: Permeability Of Mswc Uniaxial Cyclic Loading and Unloadingmentioning

confidence: 99%

“…Permeability is a key parameter to measure the permeability performance of soil and rock mass [34][35][36], and it is an important indicator to evaluate the aquitard of the spoil field [37]. In this MSWC permeability test, the inlet pressure decay method was used.…”

Section: Permeability Of Mswc Uniaxial Cyclic Loading and Unloadingmentioning

confidence: 99%

Mechanical Properties and Penetration Characteristics of Mudstone Slag-Based Waterproof Composites under Cyclic Loading

Chen,

Zhang

et al. 2023

Applied Sciences

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In this study, ground polymers were prepared from mudstone and slag. NaOH and water glass were used as alkaline exciters and mine waste rock aggregate was used as the aggregate for mudstone slag-based waterproof composites (MSWCs). A series of laboratory tests, including a uniaxial compression test, uniaxial cyclic loading and unloading test, scanning electron microscope test, and rock penetration test were conducted for macrostructural and microstructural analysis. The effect of the coupling between the mudstone proportion and the number of uniaxial cyclic loading and unloading tests was investigated. The results showed that it is feasible to use mudstone and slag to synthesize geopolymers, and that MSWCs fulfil the conditions for use as a reconstituted water barrier. The permeability of MSWCs with the different mudstone proportions set in this study fulfils the requirement of being used as a material, and the permeability and uniaxial compressive strength of the MSWCs gradually decreased with increases in the mudstone proportion. Considering the UCS and permeability of the MSWCs, the optimal mudstone proportion of the MSWC is r = 0.6. In this test, cyclic loading and unloading times of 0, 25, 50, and 100 were set, and with an increase of cyclic loading and unloading times, the UCS of the MSWCs showed a tendency of increasing first and then decreasing. In the SEM test, with an increase of cyclic loading and unloading times, microfractures and pores appeared in the MSWCs, which led to a gradual increase in its permeability and a decrease in its waterproofness.

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Research on the attenuation characteristics of seismic energy in multicoal seam mining and the warning method of rock burst

Mu,

Zhang,

Gao

et al. 2024

Energy Science & Engineering

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The mechanism of rock burst induced by the superposition of dynamic and static loads in multicoal seam mining is unique. To investigate the propagation attenuation law of large‐energy microseismic events and the induced mechanism of rock burst under this condition, this study employs FLAC3D's dynamic module to simulate and analyze the influence of propagation distance, overburden structure in multicoal seam mining, and interlayer plastic zone on vibration wave attenuation. Results indicate that when coal seams are mined at close distances, vibration waves experience significant attenuation while passing through the plastic zone between two layers of coal. At equal attenuation distances, multicoal seam mining structures exhibit greater effects on vibration wave attenuation. Considering differences between rock‐burst induction mechanisms in close‐distance coal seam group mining versus single coal seam mining, a discriminant criterion for rock bursts induced by superimposed dynamic and static loads in multicoal seam mining is established along with a monitoring and early warning method suitable for such conditions.

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Combined control of fluid adsorption capacity and initial permeability on coal permeability

Cited by 9 publications

References 35 publications

Study on the slurrying mechanism of coal water slurry prepared from coal gasification wastewater

Study on the slurrying mechanism of coal water slurry prepared from coal gasification wastewater

Mechanical Properties and Penetration Characteristics of Mudstone Slag-Based Waterproof Composites under Cyclic Loading

Research on the attenuation characteristics of seismic energy in multicoal seam mining and the warning method of rock burst

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