摘要
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 BF （blast furnace） drying quality has direct effects on BF long campaign life. The heat transfer mod- el of hearth and bottom was built and verified by the drying temperature data of BF with the volume of 1080 m3. The effects of drying time, drying temperature and intensity of cooling on th6 temperature of filling were investi- gated. It is found that the temperature of filling is 44 ℃ under the cooling water velocity of 0.5 m/s and blast tem- perature of 600 ℃, which is smaller than the drying temperature. The good drying quality cannot be achieved final- ly. 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.
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2014年第2期22-27,共6页
Journal of Iron and Steel Research
关键词
高炉
炉缸
炉底
填料
烘炉
blast furnace； hearth
bottom
filling ； BF drying process
