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| Study on operational efficiency improvement of main drainage pump in coal mines with variable frequency booster pump |
| DUAN Haipeng*, ZHANG Linwei |
| National Safety Production Tangshan Mining Pump Inspection and Inspection Center, China Coal Science and Technology Group Tangshan Research Institute Co. Ltd., Tangshan, Hebei 063012, China |
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Abstract At present, the main drainage pump in coal mines is prone to occurrence of cavitation due to limited underground drainage conditions, which can shorten the service life span of the pump significantly. In order to meet the requirements of energy conservation and emission reduction in the underground condition, and improve the inflow condition of the main drainage pump, a pressurized water supply mode was proposed by connecting a booster pump with the main drainage pump in series, and the operation of the booster pump can be controlled fully with a frequency converter. Through a theore-tical analysis, the pump-control-pump technique can change the output pressure of the drainage system, adapt to the performance of a pipeline system, improve the operational efficiency of the system, and ensure that the drainage system works in an efficient region. Based on a comparative analysis of field test, the efficiency of the pump unit composed of the booster pump and the main drainage pump with a less number of stages is improved compared with the main drainage pump with original number of stages, but also the cavitation of the main drainage pump is avoided at the same time. The frequency conversion control of the booster pump can also ensure that the pressure of the main drainage system can be adjustable, so that thesystem can operate in an efficient region to achieve the objective of energy conservation and emission reduction. The results provide a new technical scenario for design and transformation of the drainage system in coal mines.
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Received: 29 May 2019
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