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高炉烘炉质量直接影响高炉长寿,通过建立炉缸炉底砖衬传热模型,以1 080m3高炉烘炉阶段炉缸炉底温度数据加以验证。分析了烘炉时间、烘炉温度、冷却强度等因素对冷却壁与炭砖间填料温度的影响。结果表明在0.5m/s冷却水作用下,对于目前普遍采用的最高烘炉温度(600℃),填料最高温度仅为44℃,远低于要求的烘干温度,不能实现较好的烘炉效果。烘炉过程中需要减弱炉缸冷却甚至停水烘炉,适当提高烘炉温度,延长烘炉保温时间;停水烘炉时冷却壁最高温度仅为158℃,远低于铸铁冷却壁的安全工作温度。考虑到烘炉时热风的氧化性气氛,保证陶瓷质耐火材料严密覆盖在炉缸炉底炭砖表面,防止开炉前炭砖氧化烧损。通过插入冷却壁与填料交界面的热电偶温度分析炉缸砖衬的升温及保温,进而判断烘炉效果;并根据高炉固有的砖衬结构及设备参数,制定与高炉相匹配的烘炉制度。
The quality of the blast furnace directly affects the longevity of the blast furnace. The heat transfer model of the hearth of the hearth is established, and the data of hearth and bottom temperature of the blast furnace in the 1 080 m3 blast furnace are validated. The effects of oven time, oven temperature, cooling intensity and other factors on the packing temperature between the cooling wall and the carbon brick were analyzed. The results show that under the condition of 0.5m / s cooling water, the maximum temperature of the highest oven (600 ℃) currently used is only 44 ℃, much lower than the required drying temperature, which can not achieve a good ovens effect. During the process of oven drying, the cooling of the hearth should be weakened or even stopped, the temperature of the oven should be increased properly, and the holding time of the oven should be prolonged. The maximum temperature of the cooling wall when the water-stopping oven is only 158 ℃ is much lower than that of the cast iron cooling wall temperature. Taking into account the hot air oven oxidation atmosphere, to ensure that the ceramic refractory material tightly covered the surface of the furnace bottom charcoal brick to prevent burning before burning carbon brick. The temperature and temperature of the brick lining were analyzed by inserting the temperature of the thermocouple at the interface between the cooling wall and the filler to determine the effect of the ovens. The oven system matching with the blast furnace was made according to the inherent structure and equipment parameters of the brick lining.