Research On Efficient Air Cooler Of Coal Face

As mine mining becomes deeper and comprehensive mechanization improves a lot, high temperature damage gets worse and worse. At present, mine cooling has had a complete theory system and mine partial cooling technology of and mine end equipment air coolers get more and more mature. However, there are few researches on cooling technology of coal faces. Therefore, study on efficient air cooler of coal face shall be important to solve the mine partial cooling issue.The theory proposes to develop an air cooler which withstands high temperature, corrosion, scaling and has the controllable tuyere. Besides,a technology that air coolers are set up on the hydraulic support etc is supposed to develop. The paper also studies the heat exchange state between heat-eliminating medium around the coal mining and wind flow; proposes the function relationship of temperature distribution on the coal face; proposes a concept of real efficient cooling needed area in coal face; applies free submerged jet theory into the cool wind flow jet from air cooler tuyere; defines the relation between relevant performance parameter of air coolers and wind flow temperature of coal face; combines the function relationship of temperature distribution to confirm the distance and number of air coolers set on coal face theoretically; adopts matrix theory to design the air cooler’s performance parameters better. To verify the reliability of the theory, the author selects air cooler’s performance parameters based on the real condition of one coal face. Finally, the air cooler with 0.09m radius is chosen as the best plan. The air supply velocity is 2.4m/s and the supply air temperature is 22℃. The specific location is: every three hydraulic supports is built with an air cooler at the 0-63m distance away from the coal face inlet end and there are 14 ones in total; at the 60-99m distance,every two hydraulic supports is built with an air cooler and there are 13 ones in total; at the 99-150m distance, every hydraulic support is built with an air cooler and there are 31 ones in total. There are 58 air coolers in total. To verify the feasibility of the theory, the author adopts Fluent module in ANSYS, combines the real state of coal face as well as the parameters determined by the best plan to simulate the wind flow temperature field of coal face. The simulation result shows: when the coal face is not higher than 26℃, the 14th air cooler has the 4.5m of effective cooling distance, the 27th air cooler has the 3.5m of effective cooling distance and the 58th air cooler has the 3.5m of effective cooling distance. It satisfies the 4.5m of effective cooling distance from the 1st to the 14th the air cooler. In theory, the 15th to the 27th air cooler shall have the 3m of effective cooling distance and the 28th to the 58th air cooler shall have the 1.5m of effective cooling distance. The simulation result is consistent with the theory study. The study provides some theoretical values for mine partial cooling technology.