摘要
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。
The mathematical models of blast furnace (BF) hearth were established and the masonry structures of large carbon blocks and small carbon bricks for hearth were discussed from the view of heat transfer. The temperature of these two hearth structures during BF drying process were calculated as well as after blow-in. It is found that the filling between staves and carbon bricks can not be dried effectively at present BF drying conditions and the thermal conductivity of filling can not reach the designed value. Moreover, with the existing of filling, the hot face temperature of lining is higher which results in more serious erosion. Therefore, the filling should be cancelled between staves and carbon bricks. It has obvious advantage of heat transfer for carbon bricks touching with staves directly. The hearth structure of small carbon bricks could be designed to touch with staves directly so that it exterminates the barriers on heat transfer of hearth. The hearth structure of large carbon blocks should be put some small carbon bricks touch with staves directly and then make the filling between the small carbon bricks and large carbon blocks. The filling moves towards center of BF more than about 200 mm. In order to dry filling completely during BF drying process,the necessary method is without utilizing cooling water. Meanwhile, some measures are discussed for keep staves safe.
出处
《钢铁》
CAS
CSCD
北大核心
2014年第5期13-18,23,共7页
Iron and Steel
基金
国家自然科学基金资助项目(61271303)
关键词
高炉
炉缸
填料
高炉烘炉
传热
blast furnace (BF)
hearth
filling
BF drying process
heat transfer