大型高炉合理炉缸冷却制度

Rational cooling water system for a large blast furnace hearth

合理的炉缸冷却制度是保证大型高炉长寿的基础,不同冷却制度对高炉炉缸的温度分布和侵蚀状况具有直接影响.结合某4000 m3级高炉,根据传热学理论建立了高炉炉缸、炉底温度场物理模型和数学模型,通过数值模拟对"大水量、小温差"和"小水量、大温差"这两种不同炉缸冷却制度进行了研究,分析了不同冷却制度对炉缸温度场、炉缸侵蚀状况及高炉寿命的影响.结果表明,在炉役初期砖衬较厚时,不同冷却制度对炉内温度分布的影响区别不大;随着砖衬的不断减薄,不同冷却制度对炉内温度分布的影响逐渐明显;当砖衬侵蚀到一定程度后,再好的冷却也无济于事,但采用"大水量、小温差"并加强冷却可以减缓砖衬的侵蚀,延长高炉寿命.

Since the temperature distribution and erosion of blast furnace hearth are directly affected by cooling system,a rational cooling water system is the assurance for long campaign life of large blast furnace.Combined with a 4 000m3 blast furnace,physical and mathematical models of temperature fields of blast furnace hearth and bottom were built according to heat transfer theory.Two different hearth cooling systems,namely ＂low water capacity and large temperature difference＂ and ＂large water capacity and small temperature difference＂,are both investigated by modeling and numerical simulation.Effects of different cooling systems on hearth temperature field,hearth erosion and blast furnace life are also analyzed.The results indicate that during the initial period with thicker brick lining,effects of different cooling systems on blast furnace temperature distribution are nearly the same.As the brick lining gradually becomes thinner,different cooling systems have much different effects on temperature distribution.When the brick lining is eroded to a certain level,even the best cooling system is of no use,but ＂large water capacity and small temperature difference＂ and enhanced cooling measures will slow down the erosion and prolong the campaign life.