RHKTB真空精炼中炉气二次燃烧的动力学研究

KINETIC STUDY ON POSTCOMBUSTIONOF GAS UNDER VACUUM IN RH KTB

通过求解ｋ－ε－ｆ－ｗ方程组，模拟计算ＲＨ—ＫＴＢ真空处理过程中气相二次燃烧时的流场、温度场和浓度场。计算结果证明：ＲＨ—ＫＴＢ内气相二次燃烧主要发生在氧气射流的火焰烽面，ＣＯ２浓度高达６０％，温度达到２５００℃，燃烧后的氧气射流（Ｏ２浓度为３０％～６０％）冲击熔池、脱碳，产生大量ＣＯ炉气，压缩火焰烽面，使钢液面附近保持较高的ＣＯ浓度（＞６０％），避免了钢液过氧化。

By solving kfw equations, the flow, temperature and concentration fields during postcombustion of gas under vacuum in RHKTB process have been simulated and calculated Calculation results prove that postcombustion of gas occurs mainly on the flame surface of oxygen jet, where the concentration of CO2 is more than 60 %, and temperature reaches to 2 500 On the surface of molten steel, oxygen jet (concentration of oxygen is 30 %60 %) after postcombustion impacts bath, decarbonizes and produces plenty of CO gas which compresses diffused flame surface maintaining a higher concentration of CO (>60 %)above molten steel, and overoxidation of molten steel can be avoided