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从传热学角度通过建立炉缸传热数学模型,分别对大块炭砖的炉缸结构和小块炭砖的炉缸结构进行了讨论。计算了它们在烘炉阶段和高炉开炉后炉缸砖衬的温度,发现了按照目前的烘炉规范进行烘炉,难以将炭砖与冷却壁间的填料烘干,填料的导热系数达不到设计值。填料的存在导致砖衬热面温度升高,致使砖衬侵蚀加剧。因此,在冷却壁与炭砖之间取消填料,让炭砖直接顶砌冷却壁具有明显的传热优势。对于使用小块炭砖的炉缸,可以直接将炭砖顶砌冷却壁,消灭填料对炉缸传热的限制影响;对于大块炭砖结构的炉缸,先采用部分小块炭砖顶砌冷却壁,在小块与大块炭砖间使用填料,将填料向高炉内部推移约200mm以上,烘炉阶段为了将填料烘干,冷却壁断水烘炉是必需的,为了保证冷却壁的安全,同时讨论了冷却壁断水烘炉应注意的问题。
From the perspective of heat transfer, the mathematical model of heat transfer in a hearth is established, and the structure of the hearth of a large block of carbon bricks and the structure of the hearth of a small block of charcoal are discussed respectively. Calculated the temperature of the brick lining of the hearth in the oven stage and after the blast furnace was opened and found that it is difficult to dry the filler between the carbon brick and the cooling wall according to the current oven specification and the thermal conductivity of the filler does not reach To the design value. The presence of filler led to the hot lining brick lining temperature, resulting in increased erosion brick lining. Therefore, removing the filler between the cooling wall and the carbon brick, so that the carbon brick directly topping the cooling wall has obvious heat transfer advantages. For the use of small pieces of carbon brick hearth, you can directly to the top of the brick masonry cooling wall, eliminate the restrictions on the heat transfer of the furnace packing; for large charcoal brick hearth, the first part of the use of small pieces of charcoal brick Cooling wall, the use of small pieces of brick and brick between the filler, the filler to the blast furnace to push the internal about 200mm above the oven stage in order to dry the filler, cooling wall drying oven is necessary, in order to ensure the safety of the cooling wall, At the same time, it discusses the problems that should be paid attention to in the cooling water wall drying ovens.