高炉烘炉质量的研究简

 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1080m3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。

Research of BF Drying-Out Process

The BF (blast furnace) drying quality has direct effects on BF long campaign life. The heat transfer model of hearth and bottom was built and verified by the drying temperature data of BF with the volume of 1080m3. The effects of drying time, drying temperature and intensity of cooling on the temperature of filling were investigated. It is found that the temperature of filling is 44℃ under the cooling water velocity of 0. 5m/s and blast temperature of 600℃, which is smaller than the drying temperature. The good drying quality cannot be achieved finally. Therefore the effects of cooling system should be decreased or even without cooling water during BF drying process. And also the drying temperature and drying time should be improved appropriately. The maximum hot face temperature of stave is 158℃ without cooling effects during BF drying process, which is below the safety temperature of cast iron staves. Considering the oxidizing atmosphere of hot blast, the ceramic refractory lining should cover on carbon bricks closely to prevent carbon bricks from oxidation. BF drying process can be monitored and judged by the temperature of thermal couples inserted on the interface of staves and filling. According to the inherent bricking structure and apparatus parameters, the drying system should be fit for BF.