材料期刊网

铁矿石在CO+H2合成气氛下直接还原所使用的转换炉在使用过程中会发生金属尘化腐蚀。本文运用化学热力学理论与计算方法对在CO-H2-H2O气氛下发生金属尘化腐蚀时的标准反应吉布斯函数进行计算，得到了气氛碳活度(ac)gas与温度 的关系式。通过气氛碳活度(ac)gas与材料碳活度(ac)Fe3C/Fe的比较，获得两种金属尘化类型。CO-H2-H2O气氛碳的化学势受温度、CO•H2体积比、总压的影响，提高CO•H2体积比，升高总压，会使发生金属尘化的温度范围扩大。

Metal dusting will occur in converting furnace for iron ore deoxidation in CO+H2 reducing atmosphere. The function relationship between (ac)gas (carbon activity) and T (thermodynamics temperature) was deduced by calculating standard Gibbs free energy of formation of CO–H2–H2O reaction on iron in gas, utilizing the theory and method of chemical thermodynamics. Two types of metal dusting can be gained by comparing (ac)gas with (ac)Fe3C/Fe. A theoretical analysis has been conducted into the thermodynamic role of iron and the dependence of possible metal-dusting occurrence on temperature, volumetric ratios of carburizing species CO•H2, and total pressure. Increasing the volumetric ratio of CO•H2 and total pressure expands the temperature regime for metal dusting.