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International Journal of Rotating Machinery
Volume 2017, Article ID 5936506, 8 pages
https://doi.org/10.1155/2017/5936506
Research Article

Application Research on Testing Efficiency of Main Drainage Pump in Coal Mine Using Thermodynamic Theories

School of Mechanical Electronic & Information Engineering, China University of Mining and Technology (Beijing), Beijing, China

Correspondence should be addressed to Deyong Shang; moc.621@3891ydgnahs

Received 23 September 2016; Revised 15 November 2016; Accepted 29 November 2016; Published 5 January 2017

Academic Editor: Tariq Iqbal

Copyright © 2017 Deyong Shang. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The efficiency of a drainage pump should be tested at regular intervals to master the status of the drainage pump in real time and thus achieve the goal of saving energy. The ultrasonic flowmeter method is traditionally used to measure the flow of the pump. But there are some defects in this kind of method of underground coal mine. This paper first introduces the principle of testing the main drainage pump efficiency in coal mine using thermodynamic theories, then analyzes the energy transformation during the process of draining water, and finally derives the calculation formulae of the pump efficiency, which meet the on-site precision of engineering. On the basis of analyzing the theories, the protective sleeve and the base of the temperature sensor are designed to measure the water temperature at inlet and outlet of the pump. The efficiencies of pumps with two specifications are measured, respectively, by using the thermodynamic method and ultrasonic flowmeter method. By contrast, the results show that thermodynamic method can satisfy the precision of the testing requirements accuracy for high-flow and high-lift drainage pump under normal temperatures. Moreover, some measures are summed up to improve the accuracy of testing the pump efficiency, which are of guiding significance for on-site testing of the main drainage pump efficiency in coal mine.