Zi-shan Gao

Zhongkai University of Agriculture and Engineering

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Chuanjie Zhu

China University of Mining and Technology

Chang Guo

Zhejiang University

Ximiao Lu

China University of Mining and Technology

Yumin Sun

Jinshan Hospital of Fudan University

Baiquan Lin

China University of Mining and Technology

Ting Liu

China University of Mining and Technology

Sijia Hu

Jiangxi Science and Technology Normal University

Yidu Hong

Fuzhou University

Zhong Tan

Xiamen University

Pengyuan Zhao

Shihezi University

Cooperative Institutions

China University of Mining and Technology

State Key Laboratory of Coal Resources and Safe Mining

Ministry of Natural Resources

Sun Yat-sen University

Chinese Academy of Sciences

Sichuan University

Northwestern Polytechnical University

Tsinghua University

Zhongkai University of Agriculture and Engineering

Chongqing University

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Experimental comparison of CO₂, N₂, and CH₄ permeability of water saturated coals of different ranks

Energy Sources Part A Recovery Utilization and Environmental Effects (2020)

Chuanjie Zhu Na Liu Zi-shan Gao Sijia Hu Pengyuan Zhao

Coalbed methane is a kind of highly efficient and clean energy source. The permeability of coal seam affects the application of gas extraction. There are so many factors affecting gas permeability, such as gas pressure, temperature, moisture content, confining pressure, and coal rank. We experimentally investigated gas permeability of three different coals at four different temperatures (23°C, 34°C, 45°C, and 60°C) and three different moisture contents (dry, medium moisture and moisture-saturated coals). Injection gas pressure varied from 1 MPa to 6 MPa (up to 8 MPa for N2) at constant axial confining pressure of 9 MPa. The results show that under constant axial and confining pressure conditions, with the increase of gas injection pressure, the permeability of N2 and CH4 shows a "V"-shaped change trend, that is, "inflection point"; CO2 permeability decreases with the increase of gas injection pressure. The permeability of coal core samples decreases with increasing temperature, caused by thermal expansion, decrease of gas absorption and increase of porosity. As the temperature rises, the decline gradually flattens. The permeability of coal core samples decreases with the increase of moisture content, related to moisture and gas competitive adsorption, coal porosity reduction. The permeability of high rank coal is lower than the medium rank coal under the same experimental conditions, caused by the pore structure of coal sample.

10.1080/15567036.2020.1808120

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Citations (2)

Effect of high-voltage thermal breakdown on pore characteristics of coal

International Journal of Mining Science and Technology (2017)

Chuanjie Zhu Ximiao Lu Zi-shan Gao Fazhi Yan Chang Guo

High-voltage thermal breakdown has great potential application in permeability enhancement of coal seam. The characteristics of the breakdown channel, coal element, porosity and microscopic coal petrography of coal under high-voltage electric load were experimentally studied. The coal interior left apparent tracks due to electric current burning with high temperature. The percentage of C, O, Al, Fe, and Si had slightly decreased, while the content of element N increased obviously. Low-pressure nitrogen gas adsorption (LP-N2GA) and mercury intrusion analysis showed that coal porosity increased. The increases of micropores and mesopores are beneficial to promotion of the ability of gas storage, and the increase of macropores could enhance the gas seepage and migration. The results of scanning electron microscope (SEM) show that there are many exogenous fractures in coal, which is also beneficial to gas seepage and migration. The results lay a theoretical foundation for application of high-voltage thermal breakdown in coal mines.

High Voltage

10.1016/j.ijmst.2017.06.027

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Citations (28)

Experimental comparison of CO₂, CH₄, and N₂adsorption capacity on typical Chinese coals at different temperatures

Energy Sources Part A Recovery Utilization and Environmental Effects (2020)

Chuanjie Zhu Sijia Hu Zi-shan Gao Na Liu Qian Liu

(2020). Experimental comparison of CO2, CH4, and N2 adsorption capacity on typical Chinese coals at different temperatures. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects. Ahead of Print.

Anthracite

Bituminous coal

10.1080/15567036.2020.1806954

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Citations (9)

Flame acceleration in pipes containing bends of different angles

Journal of Loss Prevention in the Process Industries (2016)

Chuanjie Zhu Zi-shan Gao Baiquan Lin Zhong Tan Yumin Sun

Flame speed

Laminar flame speed

10.1016/j.jlp.2016.05.014

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Citations (18)

Experimental study on the effect of bifurcations on the flame speed of premixed methane/air explosions in ducts

Journal of Loss Prevention in the Process Industries (2017)

Chuanjie Zhu Zi-shan Gao Ximiao Lu Baiquan Lin Chang Guo

Flame speed

10.1016/j.jlp.2017.05.016

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Citations (47)

Prevention and control of abnormal gas emission caused by accidental discharge of floor fissure water: a case study

Natural Hazards (2019)

Zi-shan Gao Chuanjie Zhu Ximiao Lu Jie Ren

Fissure

10.1007/s11069-019-03835-6

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Citations (4)

The effect of bend positions on premixed methane–air explosion overpressures in ducts

International Journal of Spray and Combustion Dynamics (2016)

Chuanjie Zhu Zi-shan Gao Baiquan Lin Zhong Tan Yumin Sun

Bend structures in process industries can enhance gas explosions. Many researchers have studied their effects on flame propagations or overpressure evolutions with experiments or numerical simulations. In this work, three bends with different angles ranging from obtuse to acute were examined, and the effect of bend positions on gas explosions was also studied in the experiments. It was found that the peak overpressure evolutions under three different angles experienced three different stages, i.e. a slight downtrend before the bend, a sudden uptrend in and after the bend, and a following downtrend. The explosion violence was enhanced due to a reflection wave and flame tip wrinkle. The peak overpressure increased when the bend angles decreased because of stronger reflection and turbulence under a smaller bend angle. Additionally, the bend shortened the distance at which the peak overpressure reached its maximum values. However, the bend positions had little effect on the maximum overpressure in the ducts.

Overpressure

Reflection

10.1177/1756827716645115

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Citations (3)

Vapor-phase glutaraldehyde crosslinked waste protein-based nanofiber nonwovens as an environmentally friendly wound dressing

Reactive and Functional Polymers (2022)

Wenjie Chen Zi-shan Gao Ming He Yao Dou Guoqiang Yin

Environmentally Friendly

Wound dressing

Glutaraldehyde

10.1016/j.reactfunctpolym.2022.105203