Light Refractory Heat Conduction Coefficient Calculation And Numerical Simulation In The Temperature-flow Field

Light refractory materials (LRMs) has important influence on the loss of heat, as the industry kiln stove equipment and high temperature of the heat insulation materials in the industrial production. The use of LRMs is an effective way to achieve energy-saving industry. In this study, the finite element model was built by the heat transfer theory and finite element theory with physical parameters of mullite lightweight brick (MLB) for basic calculation obtained from the experiment. The glass kiln internal flow field and temperature field simulation diagram are designed based on the glass kiln internal temperature field and flow field coupling calculation using the Floworks, ANSYS and COSMOS software. From the above simulation results, it can be concluded that,(1) the thermal conductivity coefficients of the MLBs increases with the increase in porosity. The pore shapes greatly affect the thermal conductivity of MLBs. The thermal conductivity of MLBs with different shapes increases in the order of cylindrical pores, spherical pores, square pores.(2)Thermal conductivity coefficients of the MLBs under the floating air in the pores are higher than that of the MLBs under static air. Therefore, the introduction of closed pore might be advantageous to the decrease in the thermal conductivity coefficients. Under static air, the influence of the pore size on the thermal conductivity coefficients of MLBs is not obvious, while not consistent under flowing air. Meanwhile, the smaller the square pores, the lowest the thermal conductivity coefficients will be.(3)The finite element simulation results on the temperature distribution in MLBs with different thickness reveal that the temperature of the outside surface of glass kilns decreases with the increase in the thickness of the MLBs. The temperature of outermost wall of the floating glass furnace levels when the thickness of the MLB reaches a certain value. The optimal thickness of the MLB is100-150mm.(4) when the float glass furnace is built with light brick with the thickness of100mm, smooth gas flow without the flame collision, uniformly distributed temperature and reasonable high temperature zone in the glass kiln can be obtained based on the calculation results of the temperature field and flow field coupling. The efficiency of the insulation glass kiln can be improved using MLBs with the thickness100mm.