关键词: 远距离供液, 多工作面集中供液, 多泵站并联, 失压自动保护, 超大流量

Abstract: In order to systematically summarize the research results of centralized liquid supply technology in coal mining and promote the intelligent, efficient and green development of fully mechanized mining liquid supply technology, the development status of centralized liquid supply technology in coal mining at home and abroad was comprehensively summarized by using comprehensive analysis method. The shortcomings of the traditional way of liquid supply in working face are analyzed, the main problems that can be solved by centralized emulsion supply in coal mining and its advantages are disguessed. Research and application of the key technologies such as super large-flow emulsion supply technology, pressure control technology based on parallel multistage unloading for multi pumping stations, technology of long distance liquid return relay of emulsion and technology of automatic protection for pressure loss of hydraulic system are introduced. The large flow emulsion pump station with 1250 L/min and 40 MPa can alleviate the pressure loss and flow loss caused by long distance transportation of emulsion. The parallel multi-stage unloading device of multi pumping station can realize pressurization or unloading by controlling the unloading components of different stages, which can reduce the amplitude and frequency of pressure fluctuation of pumping station and solve the problem of insufficient frequency conversion response. The emulsion liquid return relay technology solves the problem of difficult column falling caused by excessive resistance of liquid return in working face when the liquid is supplied downward. The automatic protection technology of working face pressure loss can provide a favorable guarantee for the safety of equipment and workers in the process of emulsion long-distance transportation. In the aspects of power system, pipeline system and system layout, the development direction of centralized liquid supply in mining area is prospected and suggested. With the development of effective control technology of high frequency pulsation in liquid supply system, continuous pressure control technology of multi pump station flow based on variable frequency speed regulation, and pressure loss control technology of long distance liquid supply, the possibility of the transition for the liquid supply system of working face from " One working face with one pumping station " to "centralized liquid supply of multi working face" and then to "ground pumping station" are put foeward.