Study on Related of Performance of Parameters and Effect of Heat Transfer of Hydraulic Ventilation and Heat Transfer Machine
|School||Central South University|
|Course||Safety management engineering|
|Keywords||high temperature damage waterpower ventilation in deep mine convection heat transfer|
High temperature damage produced in deep mining is a major problem in mining production.The traditional ventilation cooling can not completely solve this problem. At the same time, the high temperature damage is more prominent along with the increase of mine mining depth.Based on in-depth study status and level of high temperature damage produced in deep mining treatment at home and abroad, one theory is proposed which is using water’s potential energy of supply water system in deep mining as a ventilation driving force in the deep mine working area and using generated dissolute and gas-liquid convection heat transfer to regulate the air temperature in deep mine, according to an effective method which is using outside cold source to reduce the air temperature, in order to reduce the temperature of underground working areas so that the work environment can achieve occupational health protection conditions and ensure mine safety and health of workers. Based on this theory, new devices which is hydraulic ventilation and heat transfer machine is developed, which is used to control and regulate deep mine temperature.The research contents and results of this paper are as follows:(1) The basic principal and main function of hydraulic ventilation and heat transfering engine were introduced. The hydraulic ventilation and heat transferring engine consisted of fan blower, hydraulic turbine and heat transfer structure. Hydraulic turbine was used to generate ventilation power; fan blower was used to form airflow; heat transfering structure provided a room for hot airflow which was exchanged with cold water in the form of convection to lower temperature. Therefore, heat transfering and ventilation were the main function of hydraulic ventilation and heat transfer engine, which provided new idea and direction for the research of ventilation and cooling in deep mine.(2) Analysis on heat source in the deep shaft and study on heat awaiting transferring were made based on artificial cooling technology at home and abroad. And the basic method for calculating thermal loading on cooling working face, in which all kinds of heat source were respectively computed and summarized at last, was determined. This method, a basis for deeply studying heat transfer engine, was not able to accurately and real-timely calculate total underground heat, but could provide for designing underground cooling in different conditions. According to this method, chilling requirement on working face was determined and ice melting test was preliminarily studied.(3) The controlling factors of power conversion was formed in the process of ventilation caused by research apparatus’ operation; The influence mechanism of controlling factors on total performance was determined; the main performance parameter relation of heat transferring engine was concluded. The preliminary test of hydraulic ventilation and heat transfer engine demonstrated that the test results of main performance parameters such as rotation speed, air volume, air pressure, can satisfy the designing requirement, inosculating with the result of theory, which proved the correctness of performance parameter relation and can be the theoretical basis for further study.The study of dynamic conversion efficiency showed that a further optimization is needed for the test scheme. According to test results, waterpower utilization rate involved in paper is high, which is suitable for the ventilation and cooling for deeper hyperthermal mine.(4) Hyperthermal testing space was built to study the rule of gas-liquid convection for heat transferring, constructing mathematical model for gas-liquid heat transfer. The effect of heat transferring in the process of convection between hot air and cold water in device was studied in different heat conditions. The tests indicated that the hot air decreased from 26 to 15, with a temperature drop of more than 10, satisfying the requirements of deep mine ventilation. Test and numerical simulation showed that the above results were feasible and effective and could be popularized and applied in engineering practice of deep mine ventilation and cooling.(5) Through test and numerical simulation, main designing parameters affecting heat transferring effect was obtained, providing direction for further improving and optimizing heat transfer engine.