COREX流程的Rist操作线模型及应用分析

Rist Operating Line Model for COREX Process and Its Application Analysis

借鉴高炉的Rist(里斯特)操作线原理,建立了COREX流程冶炼过程中的物料平衡和热平衡方程.高挥发分的块煤作为其主要燃料,入炉裂解会产生大量H2,因此必须考虑其对上部竖炉和下部熔融气化炉Rist操作线的影响.通过热力学计算,将上、下部操作线模型有机结合起来,建立COREX全流程的Rist操作线数学模型.提出了降低COREX燃料消耗的措施,如提高金属化率、改变入炉燃料结构等.模型计算结果显示,COREX炉在使用低质焦炭代替块煤后,理论上可以节约174.7 kg燃料,氧气消耗量可降低18.8%.

Material balance and heat balance equations in COREX smelting reduction process were established by taking the principle of Rist operating line in blast furnace for reference. As the mainly raw materials, lump coal with high volatile would generate large amounts of H2 during the splitting decomposition in the process. Therefore, the influences of H2 on the Rist operating lines of the upper shaft furnace and the lower melter gasifier must be considered. Through the thermodynamic calculation, the mathematic model of Rist operating lines for the whole COREX process was established by an combination of the upper and the lower operating line. Several methods for decreasing the consumption of COREX fuels were proposed, such as improving melting rate, changing the charging fuel structure and so on. The calculation results showed that when the inferiority coke was used for COREX instead of lump coal, the fuel and oxygen saving reached 174. 7 kg and 18.8% in theory, respectively.