Among the common mine disasters, water is one of the most serious disasters. Various prevention and control strategies for underground flood disasters are continuously applied to mine. However, if only ordinary single-stage pumps or multi-stage pumps are used in the tunneling process of the downhill lanes, when the water is drained, the bottom valve of the mine pump is easily exposed to the air, and air is sucked in, which will eventually lead to the pump. The phenomenon of no water supply, especially in the season of abundant rain, is more likely to pose a threat to the life and safety of underground workers. Therefore, in order to ensure the safety of the personnel working in the underground tunneling face, it is necessary to discuss and analyze the operating status of the special water pump for the mine, find out the problem, and design a set of reliable, safe and economical pump operation based on the results of the analysis. System, so as to achieve the transformation of its mechanical performance, in order to better meet the basic needs of today's mining work.
Analysis of the current situation of the operation of special mine pumps
(1) Low efficiency of water pump operating conditions The investigation shows that although mine pumps are more efficient, they cannot be used effectively, making their operating conditions inefficient and failing to meet production requirements. The main reason is that the pumps selected by many mining groups have high lifts or too much flow, which makes the operating conditions of the pumps deviate from the economically reasonable section of the industrial utilization zone, and does not play the role of high-efficiency pumps, which will also increase production to varying degrees to make
(2) Low efficiency of water pumps At present, there are still many mining enterprises in our country that have not updated their mechanical equipment in time in order to save costs. Many mines still use inefficient pumps of old models. Because the efficiency of these old models of water pumps is very low, it is difficult to meet the needs of today's mining of minerals, so that the safety of underground workers cannot be guaranteed. In addition, although some mines use more advanced OR pumps, due to lack of relevant technical personnel, the equipment cannot be inspected and repaired in time, resulting in increased mechanical loss, hydraulic loss, volume loss, and significantly reduced efficiency.
(3) Low efficiency of water pump piping Many mining companies have not fully considered the efficiency of mine water pump piping in the production process design, resulting in low efficiency of the pipeline. The main reason is that the relevant technicians are not reasonable enough to match the drainage pipeline with the water pump, and there is often a phenomenon that the pipe diameter is too small or the pipeline resistance is too large. Because the lowest power consumption per ton of water per 100 meters of mine pumps refers to the most efficient operating conditions of the system. However, the efficiency of the management system increases with the increase in flow in the industrial utilization area. If the mine pump has the highest working efficiency As the basic principle of choosing a water pump, it will not only fail to achieve the purpose of reducing energy consumption, but will easily cause serious scale in the drainage pipeline, increase pipeline resistance, reduce pipeline efficiency, and affect the personal safety of employees in the mine. .
Mechanical performance improvement strategy of mine special water pump
(1) Energy-saving retrofit strategy
In order to improve the operating efficiency of mine pumps and reduce the production costs of mining enterprises, it is necessary to carry out relevant energy-saving technology transformations to mine pumps. Therefore, by changing the operating conditions of the mine pumps, the mine pumps always operate in the high-efficiency range, and the operating conditions are consistent with the actual requirements of the water distribution network, ensuring that the mine pumps operate in a high-efficiency work area. Under normal circumstances, changing the working conditions of mine pumps is mainly achieved through impeller cutting and speed regulation. Because: 1. Under certain conditions, after the impeller is cut, the performance parameters of the pump will change and show a certain regularity. Therefore, this requires relevant technical personnel to analyze the current status of the water distribution network operation, and then calculate the amount of cutting required by the impeller according to the impeller cutting law, so that the characteristic curve of the mine pump meets the production requirements, and thus achieves energy saving Purpose; 2. Change the operating point of the pump by changing the operating speed of the mine pump, so that the outlet pressure of the mine pump is in line with the actual requirements of the pipe network, and the working state of the mine pump is in the high-efficiency area of the QH curve. Eventually achieve the purpose of energy saving. In addition, because the frequency conversion technology greatly improves the speed regulation efficiency and accuracy, and the noise is small, the energy saving potential is large, so that the pressure of the water supply pipe network is stable, easy to manage and maintain, less failures, and high reliability. It has been widely used in the performance transformation of mine pumps.
(2) Improve the efficiency of pump working conditions
Studies have shown that if the operating conditions of high-efficiency water pumps in mines deviate from the economic and reasonable use section of the industrial utilization zone, measures should be taken to remove the pump’s Gongyu head and ultimately reduce the flow rate to improve the efficiency of the pump’s operating conditions and ensure the pump Efficient operation of working conditions.
(3) Improve the efficiency of the pump itself
Mining companies must continue to introduce new technologies to change the mechanical performance of mining pumps, so as to completely transform or replace old models of low-efficiency pumps. At the same time, it is necessary to improve the maintenance and installation quality of mine pumps, reduce hydraulic loss, mechanical loss and volume loss of mine pumps, and effectively reduce the production cost of mining enterprises, and provide reliable guarantee for the ultimate economic and social benefits of enterprises.
(4) Replacement and transformation of mechanical seal
According to the working environment and requirements of the mine pump, the mechanical performance of the pump must be modified to meet the conditions of stable operation in abnormal operating environments such as vacuuming, and allow the medium to contain more solids, dust particles, and erosion resistance. Therefore, the best bellows mechanical seal, the mechanical seal adopts double thin "S"-shaped welded bellows as the elastic seal, in which the high-strength bellows is strong and reliable, and can transmit all the required torque without any auxiliary measures. Ensure that the first seal has excellent dynamic performance to ensure the efficient operation of the mine pump.
To sum up, with the continuous acceleration of mining in our country, the operating performance of mine-specific water pumps has attracted more and more attention. This requires relevant personnel to grasp the operating status of mine pumps in time based on the actual situation of the minerals. Carefully analyze and explore the reasons, and then take corresponding improvement measures to better adapt to the basic needs of my country’s mining of minerals, and ensure the reliable, safe, economic and efficient operation of underground drainage equipment, and effectively ensure the well-being of underground employees life safety.
