Research On Heat-pipe Technology In Coal Mine Working-face Cooling Water Recycling

At present, the domestic coal mining working-face’s mechanical and electricalequipments mostly adopt once-through water cooling method, by which water aredischarged directly after cooling, causing a large amount of waste water. At the sametime, this wastewater needs to be raised to the ground by pump. Clearly, thisconsumes a lot of energy and causes the secondary waste of resources.To solve above problems, the subject of this research was to designs a heat-pipetype of cooler by the combination of studying the heat-pipe technology and heat-pipeheat exchanger and analyzing the operation of the coal mining working faceequipment’s cooling water system in Tashan. In the mean time, a cooling waterrecycling system of the coal mining working face equipment was designed to makeuse of the recycled cooling water in order to minimize the amount of wastewater. Inaddition, the mechanical equipment cooling pipe’s blockage problem caused bycooling water scaling has also been solved.In this paper, the main research work is divided into three parts: the first part isthe analysis research on the law of operation of cooling water in coal face and thestudy of cooling water recycling system. This paper analyzed the deficiency of currentwater supply mode in Tashan coal mine, and according to the actual conditions, threekinds of cooling water circulation patterns were designed, and the third pattern wasapproved to be the optimal solution.The second part is the design of heat-pipe type cooler and the study of thetreatment on scaling caused by cooling water. Mainly, a theoretical research wasconducted. Based on previously given empirical formula, detailed analyses wasprovided on the gravity heat-pipe cooler’s geometrical parameters options, finoptimization design and the overall structural design, and finally came out theprinciple diagram for the design. Apart from this, by using the high magnetictechnology, the long-lasting cooling water pipe scaling blocking problem was also successfully solved.The third part covers equipment installation, debugging of the cooler, andeconomy analysis of the overall project. Regarding the special undergroundenvironmental requirements, three sets of installation scheme were providesrespectively, with which the equipment was successfully installed at last. During theprocess, we made on-site measurement and data records, which provide thefundamental and reliable evidence of scientific data leading to the final conclusion.Also, we found some practical problems and hope they can be solved in the future.After a series of economical analysis we came to a conclusion that with theinstallation of the recycling system, the cooling effect made impacts on the miningface cooling water temperature, and the average temperature reduction was more than12℃.(that the mining face cooling water temperature realizes the cooling effect afterthe recycling system has been used, the average temperature reduction is more than12℃.) In addition, all the cooling spray water used in the coal winning machine wasfrom the motor’s own cooling water, rather from water provided from the ground,which can save162,000tons of water and￥324,000of costs each year.