The Development And Test Of Hydraulic Ventilation Spiral-tray Heat Transfer Structure On The Deep Mining

Abstract:With increasing depth of mine mining, the problem of high temperature heat-harm has a direct impact on the working environment and safety of workers in production. In view of this, the research team has combined theory of mine artificial refrigeration technology and hydropower, creating a local hydraulic ventilation and efficient cooling technical method on deep mine. At the same time, the research team has designed and manufactured a hydraulic ventilation and heat transfer machine. Testing experimental results showed that the device needs to be improved,because the device had some problems such as small ventilation, large resistance and uneven water distribution. Through extensive literature, this thesis was decided to transform convection heat transfer structure in hydraulic ventilation and heat transfer machine and do some laboratory simulation experiments. The main contents and conclusions are as follows:(1) In accordance with the current situation of refrigeration about high temperature deep well at home and abroad, this thesis analyzed the current situation of mine waterpower utilization and practical experience and the theory of gas-liquid convection. At the same time, it introduced the basic principles and the main function of the hydraulic ventilation and heat transfer machine which is mainly composed by three parts. They are the power system, gas-liquid convection heat transfer system and water supply system. The gas-liquid convective heat transfer of the hot air and cold water was mainly in heat exchanger cell. This study provided a new technology for aeration cooling in deep well.(2) To determine the influence of the main parameters (such as temperature, pressure, density, etc.) of mine refrigeration ventilation system about energy, the first law of thermodynamics, the second law of thermodynamics, the principle of entropy, entropy and energy relations and convection heat transfer theory were in-depth researched and analyses. This research laid the theoretical foundation for energy conversion of the hydraulic ventilation and heat transfer machine. (3) The contact of performance parameters in the hydraulic ventilation and heat transfer machine and power efficiency and heat transfer efficiency and a clear composition of the entropy in the apparatus were defined. In order to improve the heat transfer efficiency,the thesis presented the envisaged that increasing the plate heat exchanger structure of spiral and pouring over in the heat exchanger cell.(4) By analyzing the impact of the ventilation performance and efficiency of heat transfer about the spiral gas liquid convection and referencing the plate heat exchanger structure of spiral and pouring. The reasonable spiral plate structure was designed. Meanwhile the spiral plate shape, height, orifice number and helix position were determined. Then the appropriate manufacturing process was selected to make spiral column plates that were assembled in the hydraulic ventilation and heat transfer machine.(5) Contrast experimental scheme was developed before and after heat transfer machine was reequipped. Conservation of energy and the principle of entropy were utilized to analysis device performance. The experiments showed that spiral trays could increase the energy utilization rate increased by25.5%that meeted the design requirements.