Numerical Simulation Of Sintering Process Of Sintering Machine And Research On Its Air Leakage Detection

The state of sintering process is affected by the selection of sintering operation parameters and air leakage of sintering equipment.The state of sintering will affect the quality,output and the utilization rate of resources.The faster sintering can cause the redundant time occupied by sintering machine,reduction of sintering output and waste of resources.The slower sintering can cause incomplete burning,reduction of sinter output and quality.Therefore,the sintering speed has an impact on the economic indicators of steel mills.With the 360m2 Sintering Machine in a steel mill as the object,this paper analyses the mechanism of heat and mass transfer in the sintering process,calculate the outlet temperature of sintering flue gas by establishing the mathematical model of sintering process,analyses the state of sintering process.This study will provide theoretical guidance for the selection of sintering production parameters in steel mills.At the same time,the temperature field of the air box of sintering machine and its branch pipe under different condition(air leakage and no air leakage)is simulated,according to the distribution laws of the temperature field under the condition of air leakage and no air leakage,a method of air leakage detection is proposed.The main research work of this paper is as follows:Firstly,the physical and chemical reactions in the sintering process are analyzed in detail,the material bed is used as porous media to study,the model for heat and mass transfer of the sintering process is established,and the physical model of the sintering material bed is simplified to two-dimensional unsteady physical model.Secondly,numerical simulation was performed on the sintering process using the computational fluid dynamics software Fluent,and the rationality and accuracy of the simulation were verified by field experimental data.At the same time,the influence of three parameters(thickness of material bed,carbon content and trolley speed)on the sintering process is analyzed,based on the simulation results,the suitable operation parameters are given.Thirdly,by numerically simulating the temperature field of the air box of the sintering machine and its branch pipe,the distribution law of the temperature field during air leakage and non-air leakage is analyzed.The influence of the air leakage opening on the temperature field distribution is analyzed by changing different influence parameters of the air leakage opening.According to the rules obtained by simulation,an infrared thermal imaging air leak detection method is proposed.Fourthly,the high-precision infrared thermal imager is used to detect the air leakage of the sintering machine,and three typical air leakage points(single point regular wall,multiple points regular wall and multiple points rough wall)are selected for research.The temperature distribution law at the leakage point is analyzed to verify the feasibility and accuracy of the air leakage detection method of infrared thermal imaging.