Development of Electrode of Electric Impulse Chamber for Coal Grinding
Abstract
:1. Introduction
2. Experimental Installation and Research Methodology
- Control block for monitoring the operating modes of the installation (see Figure 1);
- Generator for converting AC voltage at the input into DC voltage at the output;
- Capacitor for energy storage;
- Protection system for switching off the installation in cases when the voltage on the capacitor exceeds the established safe working voltage of the discharge;
- Spark gap (forming gap) consisting of two conductive hemispherical electrodes separated by an air gap designed to form an electric spark between the conductors;
- Working chamber for grinding coal.
3. Results and Discussion
3.1. The Test Results of the Positive Electrode
- Sample № 1—the outer part of the front end of the positive electrode is completely insulated with fluoroplastic;
- Sample № 2—the presence of a space between the insulation and the electrode, as well as a 1.5 times reduction of the diameter of the front end of the electrode compared with its main diameter.
- by increasing the insulation diameter 4 times relative to the metal electrode diameter (D = 4 × d), an effective working electrode variant, resistant to electric impulse discharge impact, was achieved;
- based on the experimental results, a possible saving in insulation material was observed compared to sample № 1.
- The liquid (technical water) in the space between the electrode and the insulation serves as additional insulation and prevents damage to the fluoroplastic.
- The protruding part of the electrode from the insulation diverts streamers from the fluoroplastic. This is explained by the fact that streamers usually grow intensively from the end of the electrode.
- The active surface of the end of the thin electrode protruding far from the insulation, due to its small diameter, does not exceed the active surface of the usually used thick electrode, which slightly protrudes from the insulation [28].
- Thus, the electrode design promotes efficient electric field distribution and reduces the risk of electrical breakdowns in the fluoroplastic insulation. This ensures high electrode reliability under pulsed discharge conditions, protecting the insulating materials from degradation and extending the device’s lifespan [29]. Additionally, this design allows for optimal control of the electrical load and reduces the likelihood of local overheating on the material’s surface, which is a critical factor for system reliability. The use of an electrode with high mechanical strength and thermal resistance, combined with its optimized shape, minimizes energy losses and ensures stable operation under dynamic electric field conditions. Therefore, this electrode design not only extends its service life but also enhances the overall efficiency of the system, ensuring reliable performance under pulsed electrical discharges.
3.2. Grinding of Coal by the Electric Impulse Method
- capacitor capacitance—from 0.25 μF to 1 μF (to increase the electric capacitance of the capacitor, 4 capacitors with the same nominal voltage and capacitance (100 kV, C = 0.25 μF) were connected in parallel);
- pulse discharge voltage—U = 32 kV;
- number of pulse discharges from 250 to 1500;
- electrode sample № 1: electrode insulation diameter, depending on the diameter of the metal electrode—D = 7 × d;
- electrode sample № 2: distance between the metal electrode and its insulation—S = 3 mm; electrode insulation diameter, depending on the diameter of the metal electrode—D = 4 × d.
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Working Fluid | Technical Water |
---|---|
Power supply network parameters: | |
Voltage, V | 220 |
Frequency, Hz | 50 |
Power consumption, kW | 2.5 |
N, Discharge | 2000 | 4000 | 6000 | 8000 |
---|---|---|---|---|
D = 3 × d, (D = 6 mm) | ||||
U = 30 kV | + | − | − | − |
D = 4 × d, (D = 6 mm) | ||||
U = 30 kV | + | + | − | − |
D = 5 × d, (D = 6 mm) | ||||
U = 30 kV | + | + | + | − |
D = 6 × d, (D = 6 mm) | ||||
U = 30 kV | + | + | + | + |
U = 40 kV | + | + | − | − |
D = 7 × d, (D = 6 mm) | ||||
U = 30 kV | + | + | + | + |
U = 40 kV | + | + | + | + |
N, Discharge | 2000 | 4000 | 6000 | 8000 |
---|---|---|---|---|
D = 2 × d, (D = 4 mm) | ||||
U = 30 kV | + | + | + | + |
U = 40 kV | − | − | − | − |
D = 3 × d, (D = 4 mm) | ||||
U = 30 kV | + | + | + | + |
U = 40 kV | + | + | − | − |
D = 4 × d, (D = 4 mm) | ||||
U = 30 kV | + | + | + | + |
U = 40 kV | + | + | + | + |
N, Discharge | 2500 | 5000 | 7500 | 10,000 |
---|---|---|---|---|
S = 1 mm | ||||
U = 30 kV | + | + | + | + |
U = 40 kV | + | + | − | − |
U = 50 kV | − | − | − | − |
S = 2 mm | ||||
U = 30 kV | + | + | + | + |
U = 40 kV | + | + | + | + |
U = 50 kV | + | + | − | − |
S = 3 mm | ||||
U = 30 kV | + | + | + | + |
U = 40 kV | + | + | + | + |
U = 50 kV | + | + | + | + |
S = 8 mm | ||||
U = 30 kV | + | + | + | + |
U = 40 kV | + | + | + | + |
U = 50 kV | + | + | + | + |
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Khassenov, A.K.; Karabekova, D.Z.; Bolatbekova, M.M.; Kudussov, A.S.; Kassymov, S.S.; Chirkova, L.V. Development of Electrode of Electric Impulse Chamber for Coal Grinding. Appl. Sci. 2025, 15, 3607. https://doi.org/10.3390/app15073607
Khassenov AK, Karabekova DZ, Bolatbekova MM, Kudussov AS, Kassymov SS, Chirkova LV. Development of Electrode of Electric Impulse Chamber for Coal Grinding. Applied Sciences. 2025; 15(7):3607. https://doi.org/10.3390/app15073607
Chicago/Turabian StyleKhassenov, Ayanbergen Kairbekovich, Dana Zhilkibaevna Karabekova, Madina Muratovna Bolatbekova, Arystan Satybaldinovich Kudussov, Serik S. Kassymov, and Lyubov Vasilyevna Chirkova. 2025. "Development of Electrode of Electric Impulse Chamber for Coal Grinding" Applied Sciences 15, no. 7: 3607. https://doi.org/10.3390/app15073607
APA StyleKhassenov, A. K., Karabekova, D. Z., Bolatbekova, M. M., Kudussov, A. S., Kassymov, S. S., & Chirkova, L. V. (2025). Development of Electrode of Electric Impulse Chamber for Coal Grinding. Applied Sciences, 15(7), 3607. https://doi.org/10.3390/app15073607