Modelling of Inner Surface Temperature Field of Blast Furnace Wall Based on Inverse Heat Conduction Problems

摘要

The inner surface temperature field of blast furnace wall directly reflects the distribution gradient of the heat flow field inside the blast furnace, which is used to judge whether the blast furnace operates smoothly. However, the blast furnace is an enclosed complex reactor with fierce internal chemical reactions and high temperature, the temperature of the furnace wall cannot be measured directly. By a layered modelling strategy, an entity model of the blast furnace wall is developed. Based on inverse heat conduction problems, the deviation between the calculated temperature and actually measured temperature at the burying point of the thermocouple in the cooling stave is set as the terminating condition, and a correction method for inner surface temperature field in furnace wall is proposed when the terminating condition is not met. The correction function is determined based on a control variable method. By applying ANSYS software, the temperature distribution field of the blast furnace wall that satisfy the allowable range of the temperature deviation can be obtained, which also demonstrates the validity of the developed model. The research achievements provide reference information for blast furnace operators to judge the furnace condition and adjust the operation parameters.