Effects of microwave-assisted pyrolysis on the microstructure of bituminous coals

Li, He; Shi, Shiliang; Lin, Baiquan; Lu, Jiexin; Ye, Qing; Lü, Yi; Hong, Youshi; Zhu, Xiangnan

doi:10.1016/j.energy.2019.115986

Cited by 172 publications

(40 citation statements)

References 74 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We suggest the adoption of the step‐by‐step nitrogen injection method for fire prevention and extinguishing in working face #10414. The recommended nitrogen injection step is 30 m. When a large amount of high concentration nitrogen is injected into the gob (Figure ), the oxygen concentration and the air leakage into the gob can be reduced …”

Section: Discussionmentioning

confidence: 99%

“…The recommended nitrogen injection step is 30 m. When a large amount of high concentration nitrogen is injected into the gob (Figure 9), the oxygen concentration and the air leakage into the gob can be reduced. [45][46][47][48] In addition, we suggest that block walls be constructed at the top and bottom ends every 30 m or so. In addition, dame sheets should be arranged outside the block wall and at the corner of the transportation roadway and the ventilation roadway of working face #10414.…”

Section: Suggestions For Fire Prevention and Extinguishing In The Minementioning

confidence: 99%

See 1 more Smart Citation

Study of the influence of the characteristics of loose residual coal on the spontaneous combustion of coal gob

Shu

et al. 2019

Energy Science & Engineering

View full text Add to dashboard Cite

Mine fires are becoming a serious issue as the intensity of mining increases, especially in deep mines. Loose coal gob has a hidden ignition location and a high possibility of spontaneous combustion, which makes fire prevention difficult. Therefore, based on the theory of gas seepage and the characteristics of loose coal, a model of air leakage and spontaneous combustion in gob is established in this paper. Using working face #10414 in the Yangliu coal mine as an example, the relationship between the three spontaneous coal combustion (CSC) zones and the three stress zones is analyzed and verified by combining a FLAC3D simulation with field monitoring. In addition, the influence of advancing speed on the CSC is discussed, and suggestions for fire prevention are presented. The results show that the variation in the calorific value of the CSC with increasing degree of looseness of the residual coal in the gob forms an arch‐shape. There is a one‐to‐one relationship between the distribution of the three stress zones and the three CSC zones. In addition, as the advancing speed increases, the contact time between the loose coal body and the air decreases and the possibility of CSC decreases. This study provides a scientific basis for fire prevention and control in mines.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Suggestions For Fire Prevention and Extinguishing In The Minementioning

confidence: 99%

Study of the influence of the characteristics of loose residual coal on the spontaneous combustion of coal gob

Shu

et al. 2019

Energy Science & Engineering

View full text Add to dashboard Cite

show abstract

“…Coal is a complex porous medium that contains an extremely uneven distribution of pores and fractures 20–24 . Coal permeability is affected not only by scale effect and stratification but also by ground stress, gas pressure, matrix sorption‐induced deformation, and temperature.…”

Section: Introductionmentioning

confidence: 99%

Coal permeability evolution characteristics: Analysis under different loading conditions

et al. 2020

View full text Add to dashboard Cite

The drainage and utilization of coalbed methane (CBM) resources can not only ensure the safe production of coal mines but also can reduce greenhouse gas emissions and protect the environment. Coal permeability is the key factor that affects the CBM drainage efficiency. To understand the coal permeability evolution characteristics, coal specimens reconstituted by coal powder with different particle sizes were prepared and their permeability under loading conditions was investigated. The results indicate that the coal permeability evolution laws measured by different gases are completely different under constant hydrostatic pressure conditions due to the influence of effective stress and the coal matrix sorption-induced deformation. Under constant effective stress conditions, the helium permeability of coals is almost unchanged if the effects of the Biot's coefficient of coals are ignored, but the methane permeability of coals decreases with increasing gas pressure. In the complete stress-strain process, the variation of coal permeability as the axial strain increases at different stages is almost completely different and the coal permeability in the residual plastic flow stage increases by 2.4-71 times, 1.5-39 times, and 2.8-116 times that of the initial state under the different boundary conditions. Furthermore, it is also found that the coal permeability evolution laws are determined by the effective stress, the sorption-induced deformation of coal matrices, and the malconformation of gas adsorption in coals. This study can help us better understand the seepage characteristics of gas in coals and guide the CBM development. C

show abstract

“…Coal plays a vital role in worldwide energy consumption and the supply of chemical raw materials [1][2][3][4]. Statistics indicate that coal accounts for 27.2% of primary energy consumption.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Foaming Ability of Surfactant Solutions by Water-Soluble Polymers: Experiment and Molecular Dynamics Simulation

Wang

et al. 2020

Polymers

View full text Add to dashboard Cite

Aqueous foam is widely used in fire extinguishing and dust suppression technologies. Improving the foaming ability is the key to reducing the added concentration of foaming agents as well as the economic cost. In this work, the effect of a water-soluble polymer (polyvinyl alcohol, PVA) on the foaming ability of anionic surfactant (sodium dodecyl ether sulfate, SDES) was studied by an experiment and molecular dynamics simulation. The experimental results showed that PVA greatly improves the foaming ability of SDES solutions when the surfactant concentration is less than 0.1%, which is attributed to the fact that the polymer can enhance the stability of bubble films and reduce the bubble rupture rate during the foam generation process. The simulation results indicate that PVA can enhance the hydration of surfactant head groups and contribute to the formation of a three-dimensional hydrogen bond network between surfactants, polymers, and water molecules, thus greatly improving the stability of bubble liquid films. The above results suggest that water-soluble polymers can be used to improve the foaming ability of surfactant solutions by enhancing the bubble film stability, which is beneficial as it reduces the added concentration of foaming agents in aqueous foam applications.

show abstract

Effects of microwave-assisted pyrolysis on the microstructure of bituminous coals

Cited by 172 publications

References 74 publications

Study of the influence of the characteristics of loose residual coal on the spontaneous combustion of coal gob

Study of the influence of the characteristics of loose residual coal on the spontaneous combustion of coal gob

Coal permeability evolution characteristics: Analysis under different loading conditions

Improvement of Foaming Ability of Surfactant Solutions by Water-Soluble Polymers: Experiment and Molecular Dynamics Simulation

Contact Info

Product

Resources

About