Research And Application Of Cold Load Thermal Response Algorithm For High Temperature Driving Face

Heading face as one of the main operating sites of mine underground,its high temperature heat damage problem has been the focus of working of cooling. In order to ensure the good cooling effect, the cooling load in internal high temperature working face should be calculated accurately.However, based on the references, there are many deficiencies such as large errors and fuzzy thinking in existing cooling load calculating methods. In this paper, the author proceed with the basic theory of the heat transfer in heading face, then the cause of the high temperature environment of the working face was analyzed. In order to reflect the high temperature conditions more directly, the model of the heading face was established and simulated with FLUENT software. Before the simulation, the temperature variation rules of the surrounding rock were obtained by the calculation of the spatio-temporal evolution model of the surrounding rock heat radiation. Based on the rules, the boundary conditions of model such as airway surface temperature were segment set and split set. Therefore, the simulation results can reflect the conditions of high temperature thermal environment more objectively,which can provide an idea for the cooling work. For the cooling load calculation of heading face, the author put forward an improvement idea on the basis of the deficiencies in existing cooling load calculating methods and the relevant provisions of the temperature in the heading face. The 30 m range in the front of the heading face was defined as the'target cooling area. In order to ensure the suitable temperature in this'target cooling area',on the basis of enthalpy difference method, the new method of cooling load inverse thermal algorithm can be deduced through the inverse thermal progress of the thermal prediction model. In addition, the cooling load of the 5 303 heading face was calculated based on the cooling load inverse thermal algorithm method. The type of air cooler was selected and then layout designed. The optimum arrangement area was obtained by the analysis of the relationship between the arrangement position of air coolers and cooling effect. Since the cooling equipment has been running, the site measurement result shows that the cooling effect can basically meet the expected requirements, the working environment of personnel concentration area can be improved. Therefore,it is proved that the calculation method of cooling load is correct and the arrangement of air cooler is reasonable.