关键词: 钢包烘烤, 高温低氧, 燃烧, 数值模拟

Abstract: High temperature air combustion (HTAC) can increase the adiabatic flame temperature and enlarge the flame volume, which can strengthen the heating capability. Based on the technology of HTAC, the fuel in regenerative ladle baker can burn completely. The preheated temperature of inlet gases affects the combustion process greatly. With the aim to study the effect of preheated temperature on the combustion, a 3-D transient mathematical model of combustion combined with flow and heat transfer is established in this paper. Based on the commercial CFD soft CFX, using the method of Finite Difference and SIMPLEC, the characteristics of high temperature diluted air in the chamber under different preheating temperatures of inlet gases are analyzed numerically. Turbulence k-e model, Mixed Is Burnt model and Monte Carlo method are used. Results evidence that due to effects of jets, backflow and eddies are formed and the high temperature burned flue gas in the ladle can mix and dilute the fresh air. Higher temperature of inlet gases is favorable to the combustion process. Increasing the preheating temperature can increase the domain temperature and its uniformity and decrease the oxygen content of local flue in the chamber. The deviation of temperature between calculated results and test results is less than 30 K. The calculated results agree with the experimental observation and theoretical analysis well.

Key words: ladle heating, high temperature diluted air, combustion, numerical simulation