| In recent years, as the average annual growth rate of the primary energy demand in our country is 10%. So the demand of the explosion-proof diesel engine trackless glue-wheel vehicle increase sharply, which lead to the pollution of the mine ventilation environment. In order to reduce the pollution emissions of the explosion-proof diesel engine trackless glue-wheel vehicle, the research on the pollution emissions laws and the measures of reducing the pollution emissions is studied, which can be used in actual engineering. The 4105 diesel engine and the explosion-proof 4105 diesel engine are investigated with experimental method in this paper, and the numerical simulation of the explosion-proof air intake system pollution emissions laws are discussed. The main working and results are as follows:(1) The NOx and particulate matter (PM) pollution emissions effected by the flow state of the diesel engine air intake system is analyzed. The technical approaches to dilute the pollution emissions of the explosion-proof diesel engine trackless glue-wheel vehicle in mine ventilation system by input more ventilation and the computational method of the additional ventilation are discussed. (2) The power performance of 4105 diesel engine and explosion-proof diesel engine is studied by experimental method. The torque, output power and fuel consumption of them were measured under different operation conditions. The change regularity of the power performance of them was summarized.(3) The three-dimensional model and mathematical physics equations of the explosion-proof air intake system were established by the actual size. Then the reasonable mesh of the model was established. The numerical simulation is performed on the flow field of explosion-proof air intake system by FLUENT software. The air flow influence laws of the explosion-proof air intake system caused by the resistance, air deflector, length of intake pipe and position distribution of the intake manifolds were studied.1) The influence regularity about the flow field caused by the pressure difference between import and export of the explosion-proof air intake system. The lower resistance would improve the flow ability and increase the mass flow, and then the volume efficiency would be improved.2) The influence of the intake system flow field caused by the different spread angle of the air deflector. The resistance of the intake system reduced to 4.36kPa, when the spread angle of the diesel engine air deflector changed from 146°to 155°, which is more effective than the original structure about 4.72%. When the spread angle of the diesel engine air deflector is 139°, the resistance of the intake system is less effective than the original structure.3) The length of the intake pipe forward and backward the explosion-proof barrier related to the performance of diesel engine. When the length of the intake pipe is 60mm, the airflow would be steady and the back-flow appearance would be weaker, the air intake resistance would be reduced with the longer pipe. When the length of the intake pipe reduced to 24mm, as the turbulence kinetic energy is most, the turbulence flow is sharpest, and the back-flow velocity is largest.4) The position distribution of the intake manifolds affects the flow field of air intake system. When the intake pipe at the side of the four intake manifolds, the pressure of the intake manifolds is non-uniform, the average resistance is largest, and the difference of the mass flow among the four intake manifolds is most.The optimum explosion-proof air intake system structure will reduce the intake resistance, and improve the performance of the explosion-proof diesel engine, and hoped to reduce the pollution emissions of the coal mines. |
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