Abstract:

It is very important to construct the temperature field of blast furnace wall for field operators to master the heat load state and fuel combustion in the furnace, find out the abnormal working conditions of blast furnace in time and ensure the stable and smooth operation of blast furnace. Aiming at the problems of difficult acquisition and visualization of the existing furnace wall temperature field, and the phenomenon of slag peel off and formation is not considered in the process of modeling and temperature measurement, this paper proposes a modeling method of blast furnace wall temperature field based on steady-state heat transfer analysis. First, taking the specific structure of blast furnace as the research object, the physical structure and heat transfer characteristics are analyzed in detail, and the three-dimensional simulation model of furnace wall is built by COMSOL simulation software. Secondly, fully considering the influence of slag skin on the temperature change of furnace wall, the physical and chemical changes of slag skin formation and shedding process are analyzed, and a steady-state heat transfer model including slag skin heat source term is established to obtain the initial temperature field of the inner surface of the furnace wall. Then, in order to improve the accuracy of the temperature field model, based on the inverse problem theory of heat conduction and taking the measured temperature of the thermocouple in the cooling wall as a reference, a furnace wall temperature field correction model was constructed to achieve iterative correction of the furnace wall temperature field data. The experiment shows that the calculation error of the heat transfer model can be controlled within 5% after the correction of the temperature field correction model, which indicates that the proposed method can meet the requirements of on-site detection accuracy and has obvious feasibility and great social value. Finally, through visual display, it provides reliable furnace wall temperature field data for the stable and smooth operation of blast furnace and the regulation and operation of staff, which is helpful to improve the production efficiency of blast furnace and the level of energy saving and emission reduction, and promote the intelligent transformation and upgrading.

Key words: blast furnace wall, slag skin, temperature field modeling, temperature iterative correction, thermodynamics, heat transfer, inverse heat conduction problem, heat conduction

摘要：

高炉炉壁温度场是掌握炉内热负荷状态和燃料燃烧情况、及时发现高炉异常工况、保障高炉稳定顺行的重要信息。针对现有炉壁温度场获取难及温度场建模过程中未考虑渣皮脱落与生成现象等问题，提出一种基于稳态传热分析的高炉炉壁温度场建模方法。首先，利用COMSOL仿真软件搭建炉壁三维仿真模型；其次，充分考虑渣皮对炉壁温度变化的影响，建立包含渣皮热源项的稳态传热模型，获得初始炉壁内表面温度场；然后，为提高温度场模型精度，基于热传导反问题理论，以冷却壁中热电偶的实测温度为参考，构建炉壁温度场修正模型，实现炉壁温度场数据的迭代修正。实验表明经温度场修正模型修正后，传热模型的计算误差控制在5%以内，满足现场检测精度要求，并能可视化展示炉壁温度场，为高炉调控操作提供了可靠的炉壁温度场数据。

关键词: 高炉炉壁, 渣皮, 温度场建模, 温度迭代修正, 热力学, 传热, 热传导反问题, 热传导