Smelting process of 180 t converter with high scrap ratio under MHCC coupling model
Based on semi-empirical equations,a generalized mass(mass)-heat(heat)-carbon(C)-cost(cost)coupling model(MHCC for short)is developed,which combines the material balance,heat balance,carbon emission,and cost-effectiveness.Using the MHCC coupling model,the mass-energy balance equation is established by combining the raw material composition,steel material structure,tapping temperature,and molten steel composition of a 180 t converter in a steel plant.The established input-output relationship of the converter blowing process is applied to investigate the influences on the four aspects of melt consumption,heat balance,carbon emission,and cost-effectiveness in the production of a converter with a large scrap ratio.The results show that with the increase of scrap ratio(i.e.the ratio of scrap steel to molten iron,hereinafter referred to as r),the mass fraction of silicon and carbon in the melt pool decreases,and the flux and oxygen consumed by the converter to reach the target end point P decreases accordingly.When r increases from 0.21 to 0.40,the mass fraction of Si in the molten pool decreases from 0.6％to 0.4％,and the mass fraction of C decreases from 3.6％to 3.1％.When the target P mass fraction of the endpoint molten steel is 0.01％,the amount of flux consumed decreases from 50.18 kg/t to 39.92 kg/t,the amount of oxygen consumed decreases from 42.87 m3/t to 40.66 m3/t(under standard condition,the same below).The carbon emission in the converter process and the production cost per ton of steel decreased.When r increases from 0.16 to 0.40,the carbon of gasification decreases from 44.9 kg/t to 38 kg/t,and the carbon emission decreases by 15.37％.At the same time,the cost of steelmaking decreases by 100.71 CNY/t.
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