Remote liquid supply system for fully mechanized coal mine face

According to the pipe length and flow rate of the fully mechanized coal mine face remote liquid supply system, the pipe diameter should be reasonably selected to make the pressure loss meet the requirements. It is understood that the maximum diameter of high-pressure hoses above 35MPa in China is 76, and there are 76 and 89 large-diameter hoses in the return line. For the fully mechanized mining face of the company's medium-thick coal seam: the matching scheme of 4 pumps and 2 tanks is adopted. The single pump flow rate is 400L/min and the outlet pressure is 31.5MPa. During normal use, 3 use and 1 backup are used. It is recommended that the liquid supply pipeline adopts double Road 76 diameter hose, the flow rate of a single tube is 600L/min. At the same time, it is recommended to add two 100L accumulators near the fully mechanized mining face, and it is recommended to use double-channel 76-diameter rubber hoses for the liquid return pipeline. According to the pipeline length of 1500m, the resistance loss along the route of the double-channel 76-diameter hose is calculated to be about 2.73MPa, and the back pressure of the dual-channel 89-diameter liquid return hose is about 1.23MPa (calculated based on the return flow rate of 600L/min, due to the return liquid flow rate of 600L/min). The flow is related to the action of the support on the working face. Therefore, the back pressure of the return liquid will change according to the size of the return flow). The output pressure of the largest pump station in China is 37MPa. If this pump station is used, the allowable pressure loss along the way will be larger, and the length of the liquid supply will also increase.

Through the above introduction to the remote liquid supply system of fully mechanized coal mine face, the following conclusions can be drawn: Through the above theoretical analysis, the pressure loss along the way, the back pressure of the liquid return, the response time of the hydraulic pump station flow and output pressure, pipe diameter, The relationship between the length of the pipe and whether the accumulator is used or not, and the relevant theoretical data are obtained, which provides a theoretical basis for the design of the long-distance liquid supply scheme. Using the above-mentioned long-distance liquid supply scheme, a liquid supply distance of 1500m can be provided. The pressure loss along the process and the back pressure of the liquid return are all within the allowable range, which can already meet the needs of the company. The company will also use the remote liquid supply system scheme for the fully mechanized face of the coal mine for layout in Pinggou Coal Mine and Limin Coal Mine.