Analysis Of Thermal Environment And Research Of Cooling Methods In Deep Copper Mine

In China some metal mines began in deep mining, at the same time, its ―three high‖ phenomenon gradually appear. Among of high temperature have bad affect on production, which caused more and more people attention on it.This paper studied of a large copper mine in China, centered on the entire process of hot metal mines governance. There were these problems, such as temperature was high surrounding rock, air flow was heated for long time when it through tunnel, and partial operating place with serious heat damage, etc. In order to solve these problems, field test was hold, a series studies were carry out by combination methods of theoretical analyzed and 3DVS, numerical simulation Fluent. The main contents were as follows:(1)The engineering practice of heat-harm treatment in a metal mine was taken as the basis for the formulation of thermal environment investigation method, carrying out on-site thermal environment investigation, getting the underground thermal environment parameters. Study on the underground thermal environment change law in the vertical and horizontal space by qualitative. What’s more, the main correlation thermal environmental parameters were analyzed quantitatively. air temperature prediction model was established based on thermal environment parameters.(2)After the statistics obtained through field surveys, it’s need to make scientific evaluation of the underground thermal environment, to determine the relationship between the primary and secondary underground heat sources, to find the most serious hot place(stope, heading face), and apply Dimine visualization software to build its visualization model.(3)A case of specific cooling technology was proposed for the underground serious heat harm place, further, Fluent numerical simulation software was used to simulate the cooling effects and determine the best cooling wind velocity and air temperature.(4) The specific cooling methods for different periods were studied to solve the thermal problems in various degree. In theory, fully demonstrated whether the ventilation cooling was failure, and the necessity of local refrigeration cooling. Summarized years of practical work of ventilation and cooling, the system of a variety of mine cooling methods applied to governance thermal environment was analyzed.The results showed that:in the metal mine, ore and wall rock heat and mechanical equipment production heat were the critical cause of creating high-temperature environment, which accounted for the 71.62 percentage of total heat release,stope and heading face were the most serious heat-harm site. The underground thermal environment changes regularly in space, but affected by production and other factors, local exist larger fluctuations.There were different degrees of relevance among the underground thermal environment parameters.With the measured statistical data, the theory formula can be found,which could predicted downhole wind temperature, by Matlab regression analysis. For stope and heading face,the critical wind velocity of aeration-cooling were 0.75m/s and 0.3m/s respectively,and the optimum air temperature were 22℃ and 23℃ respectively. Based on adequate scientific augmentation,if underground heat-harm problem can not be solved fundamentally only use the method of ventilation cooling.The local or total artificial refrigeration technology should be studied,and gradually,form a thermal environment governance system, which multiple cooling technologies were integrated application supplemented with artificial refrigeration.