Research On The Spread Characteristics And Monitoring Methods Of Belt Fire In Mines

In the process of coal resource mining,it is necessary to use belt conveyors to realize the efficient transportation of coal.In the course of operation,there will be a variety of failures of the belt,leading to the occurrence of the mine belt fire.To this end,this paper has carried out research on the combustion law of shrinking tape,numerical simulation of smoke spreading characteristics,monitoring technology and methods.And based on the experimental results,applied research in mine tunnels.It aims to further understand the spreading process of belt fire and provide basic parameters for monitoring and control of belt fire in mines.A scaled-down test bench was established to study the combustion characteristics of the tape under different wind speeds.According to the combination theory of temperature and the appearance characteristics of the tape,the combustion was divided into three stages;the combustion data under different wind speeds were analyzed and different the influence of wind speed conditions on the burning of the belt,the distribution of the maximum temperature point,and the range of the flue gas reverse wind speed conditions.Using FDS simulation software,a 1:1 model with the actual belt transportation lane size was constructed.The feasibility of the model is explored based on the results of the shrinkage experiment,and the temperature field and smoke spread characteristics of the belt fire under different wind speed conditions and the reliability of the monitoring point data are analyzed.The top of the roadway is the temperature and smoke gathering area,which is suitable for the layout of monitoring equipment;the layout of fire monitoring points under different wind speed conditions shifts to the downward wind direction with the increase of wind speed.The monitoring method of the mine belt fire is studied,and the monitoring equipment and technology suitable for the mine are designed.The tape fire temperature and multi-component gas monitoring are realized;the data accuracy of the sensor is corrected by linear fitting,and the linear equation of accuracy correction under different concentrations is obtained;the reliability of the system and the correction accuracy is studied in the laboratory.It is determined that the maximum effective distance of the system is 3 km,the maximum data transmission delay is 0.1 s,and the accuracy error is less than 0.05%or 0.5ppm.The monitoring method was studied in the 313204-transportation lane of Faer Coal Mine,and the feasibility and system stability of the monitoring method were tested.The fire hazard area and the location of the monitoring points are determined;the results show that the system can effectively monitor the real-time data of O2 and other gases in the tunnel,and realize the real-time dynamic monitoring of the underground belt transportation tunnel on the ground.The research results can provide theoretical guidance for mine belt fire monitoring technology and methods.