Research And Application Of Mine Trackless Rubber Vehicle Tyred Emissions Detection System

The soot and harmful gases in the emissions of rubber tyred vehicle are related to the safety of coal mines and the health of workers.With the widespread use of mineless track rubber tyred vehicle in coal mine production,the detection of rubber tire emissions is particularly important.Compared with road motor vehicles,underground tunnels are narrow and have limited space.Mine rubber truck emissions usually shows the characteristics of high smoke value,high harmful gas and high moisture content.Traditional emission testing equipment cannot complete all the items to be tested in a single sampling,and the sampling mouth is prone to soot accumulation.Therefore,the research on the detection system for the emissions of trackless rubber trucks is very important for mine safety.Firstly,an emission detection system suitable for trackless rubber tyred vehicle is proposed,which can simultaneously perform smoke detection and exhaust gas analysis.Among them,the smoke detection uses a transmission type smoke meter,and the exhaust gas analysis uses infrared spectroscopy.The emission detection system consists of a split-flow detection module,a back-flushing cleaning module and a sampling module.The back-flushing cleaning module can remove the soot accumulated in the sampling pipe through reverse air intake.The emission particle trapping device uses four layers of filter layer to trap the soot particles,so as to reduce the soot entering the internal cavity of the exhaust gas analyzer.The sampling probe is designed with a ring magnet to avoid distortion of the emission test results caused by human misoperation.Through the simulation analysis of the trapping performance of the soot trap,the average trapping efficiency under different filter layer precisions is compared,and the trapping device is structurally optimized.Firstly,a three-dimensional model of the emission particle trapping device is established and meshed,and the internal flow field and particle trapping performance of the particle trapping device are numerically simulated by the finite element analysis software Fluent.The simulation results show that after the emissions of rubber tyred vehicle pass through the particle capture device,the soot particles aregreatly reduced,and the effective capture of soot particles is achieved,with an average capture efficiency of 69%.By comparing the smoke smoke detection data of the same trackless rubber truck before and after the installation of the particle collection device,the collection efficiency of the particle collection device was verified by the collection performance test.Collect the test data of the emissions of trackless rubber tyred vehicle,compare the emission safety limits,and determine the safety of underground operations of rubber tyred vehicle.The results show that the light absorption coefficient of the rubber truck emissions after the installation of the particle trap is about 69.8% without installation,which is similar to the numerical simulation results of the collection performance.The multiple regression method is used to analyze the detection data of the emissions and power of the rubber tyred vehicle,and the correlation between the two is studied to obtain the ideal fitting equation.From this,a multiple regression model for the evaluation of the power performance of the trackless rubber tyred vehicle is established and passed the test Verify the dynamic evaluation model.The results show that the dynamic model can effectively evaluate the maximum chassis output power of the vehicle,and the model evaluation error does not exceed ±5%.