Research On Structure Optimization Of Alloying Furnace Based On Heat Transfer And Vibration Of Steel Sheet

In recent years,alloying galvanized steel,as a kind of new energy-efficient products in the construction,home appliances,automotive and other industries have been widely used.Galvannealing furnace as the key equipment in hot-dip galvanizing manufacture,is a decisive factor to quality of galvanized steel.In this paper,a new type of alloying furnace structure is proposed,which has the advantages of strong heat preservation ability,simple operation and convenient operation,and it could reduce the energy wastage and inhibit vibration effectively.The main works include:(1)The physical 3D models of alloying furnace and steel sheet,dividing into cells,and generating computational nodes.In accordance with structural features of alloying furnace and heat-mass transfer of fluid mechanics,the standard k-? turbulence model and was applied to numerical simulation on flow and heat transfer;blocking Lanczos was used to calculate vibration of solid domain.(2)Applied CFX software to simulated study,by analysis of the flow field and pressure distribution,found that stack effect in exit of soaking section is the main reason for insufficient insulation capacity of the furnace.The influence of the jet velocity and the strip thickness on the vibration of the strip was analyzed.It was found that the jet velocity was proportional to the amplitude of the strip,and the maximum amplitude fluctuated between 18 and 54 mm.Increasing the strip thickness,the process of energy gradually decreased trend,and the maximum amplitude gradually reduced.(3)According to simulation results,through the structure improvement ensures temperature meet requirement and control vibration of steel sheet.The side panels and spoilers were installed in the exit of the soaking zone.In equal heating power condition,furnace without lateral sealing height,add spoilers contribute to increase the temperature of the steel plate.Whereas,sealing the furnace with a certain height of 0.09 m,1.29 m or 1.99 m respectively and adding spoilers simultaneously,they could restrain heat galvanized steel sheets in the furnace,leading to temperature reduction in the surface of the steel sheet.(4)When the height of the panels reach 1.99 m,the strip temperature meets the requirements of production process,and amplitude of sheet decreased from 60 mm to 16 mm,reducing the proportion of about 80%.The numerical simulation results is beneficial to comprehense the temperature distribution and pressure distribution in alloying furnace,and provide theorical guide for structure optimization.