Research On Technologies Of Heat Control For Metal Mines

With the continuous exploitation of mineral resources in our country the deposits in the shallow strata and of the relative simple mining technology conditions are continuously being consumed so that many mines begin to exploit the mineral sources buried in the deep strata or with the complicate exploiting conditions. There are 3 difficult technologies about the deep deposit exploitation which are the forecasting and control technology of the high stress(rock burst), the control technology of heat harm in mine and the integration technology of the enforced mining. The control technology of heat harm in mine plays an important role in the deep mining in our country.The main research contents and conclusions of the thesis are as follows:1. It is found by studying a number of documents that when the harnessing schemes of the heat harm are laid down in the mine of high temperature, the factors to be considered usually conclude the normal ventilation method, the ventilation network optimization, the forecasting of the underground climate and the evaluation of the heat environment in mine. If the results of the heat environment evaluation show the problem about the heat harm harnessing could not be solved using the normal ventilation method, on the basic of the serious degree of the heat harm in mine these treatment methods should be considered for use in order which are the enforced ventilation, the recirculation ventilation, the personal protection, the local cooling and the central cooling method. As for the heat harm in metal mines in our country the heading face and the mining development period are now respectively the place and the period of the most serious harm.2. The ventilation problem of the roadway excavation during the mining development is the most difficult one of all the problems about the ventilation and the exhaust heat faced with by every deep heat mine. In the thesis a study was performed about the principles of the ventilation and the exhaust heat in the heading face and the problem how to count the heat-exhausted ventilation rate of the excavation workplace was solved by the theory analysis and testing. In theory the best scheme about the heat-exhausted ventilation in the heading face is between the cooling ventilation and the enforcement ventilation. In many excavation workplaces of the high temperature, the best heat-exhausted ventilation rate is smaller than the fume-exhausted or dust-exhausted ventilation rate. For the enforcement ventilation also enforces the heat humidity transfer between the gas and the surrounding rock mass, it could not effectively lower the temperature in the workplace and could only improve the heat transfer condition and the comfort level of the human body.3. During the mining development period the main ventilation system isn't still built so that the goal of controlling the heat environment could not be gained by the temperature-lowering ventilation. Moreover at the period it is unnecessary to use the cooling method. So the mobile air conditioning room technology (MACRT) for mine use is invented to solve the difficult problem. It insulates the miner from the heat environment in the mine by the heat barrier which forms the air conditioning room cooled by a special air cooler which is suitable to use underground so that the mini environment in the room can be accorded with the safety regulations.4. The key technology of the mobile air conditioning room for the mine use is its special-purpose air cooler. So in the thesis a practical mine-used air cooler was developed by the theoretical and experimental study which used cleverly the hydraulic fan whose power was from the potential energy of the high pressure water in the mine. The air cooler did not consume the electrical power and integrated the ventilation process with the air cooling process so that the man-made heat translated from the electrical power of the electrical fan was eliminated. Furthermore, the hydraulic fan retrieved the most potential energy of the high pressure water to avoid its transfer into the heat energy.5. The personal protection technique to solve the problem of the high temperature protection for the moving workmen in mines is a new technology which is suitable for the mine situation in our country when used in the high temperature mine. The technology is simple, convenient and of low cost.6. The ventilation network is always a complex one in the high temperature mine which makes the environment management in the deep mine become very difficult in addition to the effect of the high temperature. VBA programming technique is proved to be effective when used to solve the difficult problem of digitalizing a ventilation network in the complex high temperature mines.7. There have been many research achievements in the field about the optimization of the mine ventilation system. But the general optimization method is different in theory and application from the optimization method of the ventilation system in the high temperature mines whose goal is to improve the environment comfort level of the workplace in mines. So by using the computing method about the heat environment in the deep high temperature mine a program for calculating the complex hot climate in the mine was developed to forecast the heat environment in the whole mine. The program was also successfully used to analyze the ventilation network and optimize the heat-exhausting scheme for Fankou lead-zinc mine. Its application is proved to be a good try in the research field.