一、引言 以空气为载热体的热风炉具有结构简单、金属耗量少、系统热效率高等优点,在物料干燥、矿井通风等方面得到了广泛应用。已有的受热面为碳钢的热风炉都存在一些问题,其中关键问题是受热面金属局部超温,超温处金属氧化变形甚至烧坏,造成空气向烟气侧泄漏,使热风炉出力降低,增加了热风炉的排烟热损失。 I. INTRODUCTION Hot air stove with air as heating medium has the advantages of simple structure, less metal consumption and high system thermal efficiency. It has been widely used in material drying and mine ventilation. The existing hot air stove with carbon steel has some problems, of which the key problem is the over-temperature of the metal on the heating surface, the oxidation or deformation of the metal at over-temperature and even the burning of air, leading to the leakage of air to the flue gas side, , An increase of hot blast stove exhaust heat loss.