Experimental study on the influence of energy conversion in the process of load coal plasma breakdown

Zhang, Xiangliang; Lin, Baiquan; Yang, Wei; Shen, Chunming

doi:10.1016/j.energy.2020.119469

Cited by 17 publications

(7 citation statements)

References 32 publications

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“…Bao et al showed that at the same discharge voltage, the preset crack angle, the maximum principal stress, and the peak pressure of SWs were the main factors affecting the cracking effect of HVEPs . In addition, the capacitance value, water content, and plasma also affect the fracturing effect of HVEPs. The study concluded that the factors affecting the fracturing effect of HVEPs should be coupled and diverse.…”

Section: Resultsmentioning

confidence: 99%

“…High-voltage electrical pulse (HVEP) is a new type of coal and rock fracturing technology. During the implementation of HVEP, the energy of capacitors reaches a threshold value and is transferred to the load through the discharge switch . The action forms of HVEP are mainly divided into electrohydraulic cracking and electric cracking. , In the former, the electrode is discharged in water, and the aqueous medium is broken down to form a discharge channel to release electric energy.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the Experimental High-Voltage Electric Pulse Fracturing of Rock with Capacitance as a Variable

Zhang

Nie

2023

Energy Fuels

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The fracturing experiment of hard rock was carried out by self-designed high-voltage electrical pulse (HVEP) equipment. When the discharge voltage was 10 kV, the capacitance was increased from 20 to 500 μF to increase discharge energy. The rock was fractured at discharge conditions of 10 kV and 500 μF. Images of the fracture process of the rock were recorded. The action characteristics of HVEP are obtained by analyzing the current waveforms, strain curves, and vibration curves at different discharge energies. The increase in capacitance can enhance the current peak, strain peak, and peak particle velocity (PPV). Therefore, increasing the capacitance can achieve a stronger cracking effect. However, the discharge effect of HVEP does not always increase with the increase of capacitance. The rock will show obvious instability characteristics due to the appearance of cracks, including the prolongation of peak strain time and the acceleration of vibration decay rate.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of the Experimental High-Voltage Electric Pulse Fracturing of Rock with Capacitance as a Variable

Zhang

Nie

2023

Energy Fuels

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“…28 SEM is an effective method to observe the surface microstructure and accurately characterize the morphology of the tested material. 29 In this paper, the MiniMR NMR analyzer (Newmark Electronic Technology Co., Ltd., China) was employed for pore characterization. The measurement parameters are listed in Table 2.…”

Section: Methodsmentioning

confidence: 99%

Experimental Research on Water Migration-Damage Characteristics of Lignite under Microwave Heating

et al. 2021

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Microwave has attracted much attention with respect to coal drying, especially improving the performance of lignite. In this study, the characteristics of dehydration dynamics and changes in the physical structure of lignite under microwave radiation were investigated. The results show that the change process of temperature and moisture is phased in the microwave dehydration period (0−180 °C). Moreover, the change in the moisture content of lignite is actually the coupled migration of liquid water and water vapor, and the pressure gradient and temperature gradient formed by uneven evaporation of water under high-power microwave heating not only promote the formation, development, and connection of pores and fractures but also contribute to the movement of water, especially partially liquid water which can directly migrate to the coal surface. Higher moisture content means more intense water movement under microwave heating as well as more significant lignite drying and structural damage effects. The research discussed the correlation between moisture movement and lignite structure, which can provide constructive insight into the efficient application of microwave drying and heat-driven cracking technology to coal.

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“…When there are more cations adsorbed in coal, the electrical conductivity is obviously enhanced [57]. Generally speaking, the electric pulse breakdown of coal samples is mainly divided into surface fracturing and internal fracturing [58,59]. The former is the failure of the performance of the insulating or weakly conducting regions of the coal under the action of a strong electric field, resulting in the rapid flow of current from the surface of coal sample; the latter is the electrical and thermal stresses generated by the passage of current from the conductive regions connected in the coal to destroy the plasma channels, leading to fractures in coal sample.…”

Section: Cation Adsorption and Electric Field Variationsmentioning

confidence: 99%

AFM characterization of physical properties in coal adsorbed with different cations induced by electric pulse fracturing

Jia

Liu²,

Cai³

et al. 2022

Fuel

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Experimental study on the influence of energy conversion in the process of load coal plasma breakdown

Cited by 17 publications

References 32 publications

Investigation of the Experimental High-Voltage Electric Pulse Fracturing of Rock with Capacitance as a Variable

Investigation of the Experimental High-Voltage Electric Pulse Fracturing of Rock with Capacitance as a Variable

Experimental Research on Water Migration-Damage Characteristics of Lignite under Microwave Heating

AFM characterization of physical properties in coal adsorbed with different cations induced by electric pulse fracturing

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