Research on new cooling and waste heat utilization methods of liquid ring vacuum pump for coal mine gas extraction

Abstract

The high temperature of gas drainage liquid ring vacuum pump is an important reason for its low operating efficiency and short service life. Based on the wasted power dissipation theory of liquid ring pumps, the heat generation-heat dissipation mechanism of the pump was quantitatively analyzed, and an intelligent cooling and waste heat utilization technology for gas extraction pumps based on low-temperature heat pumps was proposed. An engineering test system was developed to investigate the effects of inlet fluid temperature, operating fluid flow rate, ambient temperature and other parameters on the cooling performance of the system. Taking the 2BEC87 gas extraction pump of Licun Coal Mine as the test object, when the suction negative pressure is -53 kPa and the inlet liquid flow rate is 10 m3/h, the inlet liquid temperature can be reduced from 35 °C to 16 °C, and the operating temperature can be reduced from 54 °C to 45 ℃. The cooling effect is significant, and this technology can improve the operating efficiency of the drainage pump by more than 7%.

Keywords

• gas extraction pump
• useless power consumption
• cooling
• waste heat utilization
• low temperature heat pump