Full
Outline
To address the erosion wear issue of electric ball valves used in heavy medium suspension transportation systems of coal preparation plants，a combined approach of numerical simulation and experimental study was adopted to investigate the formation mechanism of the erosion process.The erosion rate，erosion area，and damage distribution patterns of electric ball valves under different inlet flow velocities，particle sizes，and valve openings were analyzed.The results show that compared to particle size and valve opening，the inlet flow velocity has a more significant impact on the erosion wear of electric ball valves and is the dominant factor affecting the erosion rate.When the inlet flow velocity increases from 0.8 m/s to 1.5 m/s，the maximum erosion rate increases from kg/（m2∙s） to kg/（m2∙s），while the erosion area on the sphere surface expands significantly.The formation of erosion pits mainly stems from microcrack propagation and material spallation caused by high‑speed particle impact，with large‑sized particles capable of forming erosion pits 20~50 μm in diameter.By controlling the inlet flow velocity to no more than 1.0 m/s，restricting heavy medium particle size below 45 μm，and adjusting the valve opening to the optimized range of 60%~80%，the degree of spherical erosion damage can be significantly reduced，thereby effectively extending the service life of electric ball valves.This study not only provides an optimization solution for the stable operation of heavy medium suspension transportation systems but also lays a theoretical foundation for achieving precise flow control.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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