Influence and evaluation of indirect measurement variables on calculation of BOF thermal equilibrium
In order to further improve the accuracy of thermal equilibrium calculation and improve the temperature control level of end point for BOF,based on the industrial practice of 210 t BOF automatic steelmaking,the influ-ence of indirect measurement variables(hot metal temperature change,carbon content of hot metal,hot metal load-ing in BOF production process,furnace fettling,empty furnace,and thermal state of furnace lining)on thermal equilibrium calculation was studied by industrial test and data regression method,and specific algorithms and empiri-cal equations were developed.The results show that using the saturated solubility of carbon in hot metal to correct the direct test carbon content can more truly reflect the level of carbon content in hot metal and reduce the error of total oxygen consumption in the process of thermal equilibrium calculation.In production,the heat storage capacity of the furnace lining can be measured according to the average tapping temperature level of the previous heat,so as to realize the correction for the thermal equilibrium calculation of the next heat and reduce the calculation deviation of thermodynamic theory.After continuous optimization,the error of thermal equilibrium calculation in BOF steelmak-ing process is significantly reduced,and the hit rate of endpoint temperature is increased from 70％to more than 90％,which realizes the accurate control of tapping temperature in BOF automatic steelmaking.
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