Study On Structural Parameters Of Walking-beam Reheating Furnace Based On Zonal Method

The thermal process of walking-beam reheating furnace has been a hot issue of the study.In this thesis,with a walking-beam reheating furnace as the object of study,the zone radiation model was established based on MATLAB software platform.Then the temperature field of furnace gas,furnace wall and slab and the heat flow on slab surface had been calculated.Compared with the actual measured values,the maximum relative error of calculated temperature field was less than 5%.The model was used to simulate the influence of structural parameters of walking-beam reheating furnace on the heating of slab and the exhaust temperature.The simulation results showed that:(1)When the height of upper furnace in each section of furnace varies from 0.5-2.9m,the height variation of preheating zone and the first section of heating zone had a greater impact on the slab surface temperature and exhaust temperature.However,the height variation of the second section of heating zone and the soaking zone had almost no effect on the slab surface temperature and exhaust temperature.For the preheating zone and the first section of heating zone,when its height is less than 0.9 m,the surface temperature of slab is obviously increased,and the corresponding exhaust temperature obviously decreases with the increase of height;When the height of the preheating zone is higher than 1.3 m,the influence of the height on the slab surface temperature and the exhaust temperature gradually decreases;When the height of the first section of heating zone is higher than 1.9 m,the influence of the height had almost no effect on the slab surface temperature and the exhaust temperature.(2)When the condition of furnace was a constant,the slab average temperature increased about 10.75? and the average exhaust temperature descended about 13.29? when the preheating zone was one meter lengthened.The maximum temperature difference at the cross section of the slab was reduced by about 2.88? when the soaking zone was one meter lengthened.(3)When the process parameters were constants,the relative length of each zone was optimized by this model.The average exhaust temperature in the furnace is reduced by 6.71?,the average temperature of slab was increased by 5.57?,and the maximum temperature difference at the cross section of the slab was reduced 3.93?.It can be seen that the model could be used to determine the height of preheating zone and heating zone,and to optimize the relative length of each furnace zone,which was conducive to the heating of the slab.And the model had practical significance to the reconstruction of the existing furnace and the construction of new furnace.