A coupled electromagnetic irradiation, heat and mass transfer model for microwave heating and its numerical simulation on coal

Huang, Jinxin; Xu, Guang; Hu, Guozhong; Kizil, Mehmet S.; Chen, Zhongwei

doi:10.1016/j.fuproc.2018.04.034

Cited by 90 publications

(38 citation statements)

References 42 publications

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“…The first term on the left side of Equation (11) describes the relationship between temperature and time. The second term on the left side of Equation 11describes the relationship between temperature and space.…”

Section: B Energy Conversion Equationmentioning

confidence: 99%

“…Microwave heating of coal promotes the desorption of coalbed methane from coal; the process is highly sensitive to the excitation frequency, and higher powers cause greater thermal heterogeneity [11]. A fully coupled electromagneticthermal-mechanical model was developed to investigate the influence of coal compaction, thermal expansion, thermally induced gas desorption, and sorption-induced coal deformation on the coalbed methane extraction [12].…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of the Temperature Field of Coal Subjected to Microwave Directional Heating

Zhang

Yang

et al. 2020

IEEE Access

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Microwave directional heating can rapidly increase the temperature of coal and promote the desorption of coalbed methane. The temperature field of coal subjected to microwave directional heating was simulated by using COMSOL software. By coupling the energy conservation equation for an electromagnetic field with the heat conduction equation for solids, a heat conduction equation for the microwave directional heating of coal was established. The effects of the microwave heating time, power, frequency, incident distance and cross-sectional area of the waveguide on the temperature field of coal were studied via simulation. The results revealed that the increasing rate of temperature was high in the early stages of microwave heating. Moreover, higher microwave power corresponded to a higher coal sample temperature, a larger temperature gradient for the coal sample, and less energy being required to achieve the desired coal sample temperature. Additionally, it was found that there is an optimal microwave frequency that maximises the temperature of the coal sample. A larger microwave incident distance resulted in a lower average coal sample temperature. The waveguide was also found to have an optimal cross-sectional area that maximises the maximum temperature of the coal sample. INDEX TERMS Microwave, coal, directional heating, temperature field, numerical simulation.

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Section: B Energy Conversion Equationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Temperature Field of Coal Subjected to Microwave Directional Heating

Zhang

Yang

et al. 2020

IEEE Access

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“…From previous studies [47][48][49][50], we know that coal seam porosity is sensitive to the effects of stress, as well as to the strength coefficient. The results obtained in this study give new insight into the mechanisms of coal seams containing different layers.…”

Section: Effect Of Mixed Coal Mass Ratio On Gas Adsorption Constant Bmentioning

confidence: 99%

Experimental Investigation of the Adsorption Characteristics of Mixed Coal and Variations of Specific Surface Areas before and after CH4 Adsorption

Zhao

Liu

et al. 2019

Applied Sciences

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Tectonic coal is a kind of soft coal that is generated during tectonic movement. Gas outbursts usually occur in seams containing both virgin coal and tectonic coal. To reveal the adsorption characteristics of this type of coal seam (containing both virgin coal and tectonic coal), both tectonic coal and virgin coal were collected from the same longwall face and a series of laboratory tests were conducted, including coal sorption tests and pore specific surface measurements. Both the tectonic coal and virgin coal were crushed into coal powder (0.18–0.25 mm) for the coal sorption tests. In these laboratory tests, different mass ratios between tectonic coal and virgin coal were tested. We found that with the increase of the percentage of tectonic coal, the adsorption volume showed a rising trend, reached its maximum value, and then decreased. The specific surface areas of the mixed coal samples had the same evolution trends as those of the adsorption volume. From the laboratory tests, we found that when the mass ratio of virgin coal to tectonic coal was 1:1, both the adsorption volume and the specific surface areas reached their maximum values. Due to the percentage variation of the tectonic coal in the panel with the advancement of the longwall face, when the tectonic coal accounted for 50% of the total coal, the gas content would rise. Thus, proper measures should be adopted for outburst hazards control. The mathematical model between the change of specific surface area and the stress and strain of pore expansion before and after gas adsorption was established, and the relationship between the change of pore structure and gas emission before and after gas adsorption was obtained. It provides a theoretical basis for further research on coal and gas outburst mechanisms.

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“…The experimental research could only provide the macro separation result, the content mortar adhesion, strength, failure mode, for example. In last few years, numerical simulation researches were achieved to give an insight into the complex multi-field coupling of microwave treatment process [32][33][34][35][36][37]. As powerful software, COMSOL Multiphysics could model microwave heating by coupling electromagnetic, solid heating, solid mechanics and mass transfer modules.…”

Section: Introductionmentioning

confidence: 99%

A Fully Coupled Electromagnetic Irradiation, Heat and Mass Transfer Model of Microwave Heating on Concrete

Wei

Shao

Chen³

et al. 2021

IEEE Access

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A coupled electromagnetic irradiation, heat and mass transfer model for microwave heating and its numerical simulation on coal

Cited by 90 publications

References 42 publications

Numerical Simulation of the Temperature Field of Coal Subjected to Microwave Directional Heating

Numerical Simulation of the Temperature Field of Coal Subjected to Microwave Directional Heating

Experimental Investigation of the Adsorption Characteristics of Mixed Coal and Variations of Specific Surface Areas before and after CH4 Adsorption

A Fully Coupled Electromagnetic Irradiation, Heat and Mass Transfer Model of Microwave Heating on Concrete

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