Coal Silo Temperature Online Monitoring And Inerting Protection System Design And Experimental Research

Due to its high space utilization rate,obvious environmental advantages,flexible deployment of the system and even feeding,the power plant silos have been widely popularized and applied.However,the closed structure also poses a potential hazard to the long-term storage of coal and can easily lead to coal storage Increased temperature and even spontaneous combustion.Therefore,the comprehensive and effective monitoring of the temperature field of loose coal in silos and the inerting protection are important measures to ensure coal storage safety.According to the analysis of influencing factors on the thermal physical parameters of loose coal,the thermal conductivity measurement of loose coal was designed according to the principle of hot wire method,and the thermal conductivity was obtained when the parameters of different particle sizes,coal quality and temperature were combined.According to the gray relational theory,the relationship between the different factors and the thermal conductivity of loose coal is obtained by the analytic hierarchy process method and entropy method.It is concluded that the external factors are the key factors to determine the thermal conductivity.The average particle size has the greatest influence on the thermal conductivity of loose coal.Combined with the actual coal storage,a mathematical model of the temperature field of a loose coal body is established under reasonable assumptions.Design and construction of temperature field monitoring system experimental device,access to six different conditions of temperature distribution experimental data,based on porous media,heat and mass transfer theory,analysis of different heating intensity,The measuring point and the heat source spacing,heat source arrangement orientation on the temperature field monitoring impact.The simulation experiment device of inerting protection system was designed and constructed.The maximum diffusion range of gas at different inlet flow velocities was obtained by the combination of observation and measurement,and the effect of jetting time and coal deposit height on the inerting range was analyzed.The gas flow velocity is slowed down in loose coal.The larger the flow rate,the larger the diffusion range.Under the existing experimental conditions,the coal deposit height has a limited effect on the inert gas diffusion range.