Numerical simulation of high voltage electric pulse comminution of phosphate ore

Razavian, Seyed Mohammad; Rezai, Bahram; Irannajad, Mehdi; Ravanji, Mohammad Hasan

doi:10.1016/j.ijmst.2015.03.023

Cited by 35 publications

(9 citation statements)

References 13 publications

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“…In addition, the electrodes are wrapped by an insulating medium, and the material properties of the electrodes, water, and insulating medium are shown in Table 2. [44] Based on the original electric breakdown model, two magnets were placed around the rock, as shown in the figure to simulate the effect of the external magnetic field on the electric pulse breaking the rock, as shown in Figure 3. The maximum magnetic induction strength at 55 kV is 4.77 T, corresponding to the maximum current because the external magnetic field is much larger than the self-magnetic field and conforms to the direction of the self-magnetic field so that the self-magnetic field can be neglected.…”

Section: Geometric Modeling Of Electric Breakdownmentioning

confidence: 99%

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The effect of magnetic field on the electric breakdown trajectory of high‐voltage electric pulse rock breaking

Liu,

Zhou,

Zhu

2023

Contributions to Plasma Physics

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High‐voltage electric pulse drilling technology has the advantages of high rock‐breaking efficiency, low energy consumption for rock breaking, and good quality of well wall, which is a new and efficient potential rock‐breaking method. In this paper, we constructed a numerical simulation model of rock electric breakdown and realized the whole process of rock breaking and plasma channel generation by high‐voltage electric pulse. The results of the study showed that the change of magnetic field has a large influence on the formation of plasma channels inside the rock, and under the self‐magnetic field environment, the plasma channels inside the rock show branching, and the maximum penetration depth and maximum damage depth are higher than those under the non‐magnetic field environment. In the external magnetic field environment, the plasma channels gradually tend to develop “downward” (inside the rock), and the temperature distribution of the plasma channels inside the rock is more concentrated. In the presence of a magnetic field, the speed and degree of freedom of charged particles are limited. In an external magnetic field environment, the charged particles cause fewer particles to deviate, and the particles show a “downward” accumulation phenomenon. The research in this paper can provide certain theoretical and technical guidance for the development of electric pulse rock‐breaking technology and provide reference for the development and parameter optimization of electric pulse rock‐breaking tools.

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Section: Geometric Modeling Of Electric Breakdownmentioning

confidence: 99%

“…In addition, the electrodes are wrapped by an insulating medium, and the material properties of the electrodes, water, and insulating medium are shown in Table 2. [ 44 ]…”

Section: Geometric Modeling Of Electric Breakdownmentioning

confidence: 99%

The effect of magnetic field on the electric breakdown trajectory of high‐voltage electric pulse rock breaking

Liu,

Zhou,

Zhu

2023

Contributions to Plasma Physics

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“…The use of this technology was not limited only to the increased plasticity of cold drawn metal, it was found to be used with special surface finishes, coatings, etc. [8][9][10]. The high density of electric current in a pulse restricts the use of such technology, primarily the power of equipment.…”

Section: Status Of the Problemmentioning

confidence: 99%

Improving the performance parameters of railway wheels with the help of optimal design technologies of their electric pulse processing

et al. 2019

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The processing by pulses of electric current (PEC) of a fragment of the rim of a railway wheel was carried out on the DS10D equipment. When the density of the electric current is from 3 to 17 A/mm2, the processing cycle consisted of the action of a pulse with a duration of 2.5-3 s and a pause between pulses of 4 s. After 150 cycles of PEC, the hardness of cold-formed metal was reduced from 10 to 20%. Studies of the parameters of the metal structure of the wheels have determined that the processing of PEC leads to a decrease in the number of defects in the internal structure, which are accumulated as a result of cold deformation of the rim along the rolling surface of the railway wheel. It has been established that, according to the nature of the influence on the hardness distribution of carbon steel, the PEC treatment corresponds to changes during tempering in the average temperature range and allows to significantly increase the operating parameters of the wheels of railway equipment.

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“…By adjusting the parameters of the high voltage pulse, electrode type, etc, the plasma channel is formed inside the rock. Second, with the rapid injection of external electrical energy, the temperature and pressure inside the plasma channel rise sharply, and the channel expands rapidly, radiating shock waves outward, and generating strong mechanical stress in a very short time, which stimulates rock cracks and fractures [7,8]. Since the plasma channel is formed inside the rock during the HVPD rock fragmentation process, it is difficult to measure the shock waves and stress waves.…”

Section: Introductionmentioning

confidence: 99%

Stress wave analysis of high-voltage pulse discharge rock fragmentation based on plasma channel impedance model

Huang

Liu

Zhao

et al. 2023

Plasma Sci. Technol.

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High voltage pulse discharge (HVPD) rock fragmentation controls the plasma channel to form inside the rock by adjusting the electrical parameters, electrode type, etc. In this paper, a HVPD rock fragmentation test platform was built and the test waveforms were measured. Considering the effects of temperature, channel expansion and electromagnetic radiation, the impedance model of the plasma channel in the rock was established. The parameters and initial values of the model were determined by an iterative computational process. The model calculation results can reasonably characterize the development of plasma channel in rock and estimate the shock wave characteristics. Based on the plasma channel impedance model, the temporal and spatial distribution characteristics of the radial stress and tangential stress in the rock were calculated, and the rock fragmentation effect of the HVPD was analyzed.

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Numerical simulation of high voltage electric pulse comminution of phosphate ore

Cited by 35 publications

References 13 publications

The effect of magnetic field on the electric breakdown trajectory of high‐voltage electric pulse rock breaking

The effect of magnetic field on the electric breakdown trajectory of high‐voltage electric pulse rock breaking

Improving the performance parameters of railway wheels with the help of optimal design technologies of their electric pulse processing

Stress wave analysis of high-voltage pulse discharge rock fragmentation based on plasma channel impedance model

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