Research On Thermal Characteristics And Energy Saving Of Regenerative Furnace

Rolling furnace is one of the important process equipment in the iron and steel production process,also is the main energy-consuming equipment in the rolling process.Improving the thermal efficiency of heating furnace,reducing energy consumption per unit of product,and reducing emissions of pollutants have a positive effect to the iron and steel enterprises in energy saving and sustainable development.In recent years,the regenerative heating furnace has been continuously improved,performance and indicators of it is more and more excellent now.Compared with the traditional heating furnace,the temperature of exhaust gas of the regenerative heating furnace is greatly reduced,making the furnace thermal efficiency improve.Regenerative heating furnace can burn the blast furnace gas with low calorific value singly,the content of NOx in combustion products is lower.The temperature distribution in hearth is homogeneous,the heating quality of steel billet is good.These advantages make the regenerative rolling furnace be widely applied in the iron and steel enterprises.Therefore,it has great engineering significance for iron and steel enterprise to study the thermal characteristics of regenerative rolling furnace,to dig energy saving potential of the furnace and to improve its energy efficiency.In this paper,the integrated heat transfer process of the regenerative heating furnace hearth was analyzed firstly,the energy saving principle of the blackbody enhanced radiation heat transfer technology was researched combined with the relevant theory of the heat radiation.Then,using the ICEM-CFD and Fluent in ANSYS,the three-dimensional geometric model of the regenerative heating furnace was established.The k-? turbulence model,eddy dissipation model,P-1 model,thermal NOx andprompt NOx model were chose to simulate the temperature field of two furnaces,radiant heat transfer of the one got intensified.By analyzing the radiation heat transfer process,the temperature field distribution and the intensify radiation effect of the blackbody strengthening furnace,the blackbody elements were installed after designed in the actual heating furnace.And the radiation heat transfer inside the furnace is strengthened.Based on the thermal balance of regenerative heating furnace,the influence of the installation of the blackbody elements in the furnace on its thermal performance and related energy consumption was analyzed.The black body elements installed in the wall and the top of the regenerative heating furnace,can strengthen the radiant heat transfer of the furnace.The blackbody technology not only saves energy and reduces consumption,but also prolongs furnace lining life and improves the heating quality of the steel billet.The simulation results show that when the furnace surface area and blackness were increased,the temperature distribution of the hearth is more homogeneous.The temperature is not only slightly increased but also stable in the middle of hearth,which are helpful to reduce the temperature difference and heating defects of the billet.The increase of the heat transfer rate of the wall shows that the heat transfer intensity increases.The results of the thermal balance test show that the furnace heat dissipation of the heating furnace with the blackbody elements is reduced by 11.43% when the furnace surface temperature is reduced by 2~5 ? compared with the non-installed heating furnace.The fuel consumption of the heating steel billet is reduced by 8.3%,the thermal efficiency is increased by 6.3%,and production increased by 11.4%.The final result shows that the comprehensive energy efficiency of the bold technology is about 8.2%.