鹿岛厂3号高炉在开炉7年之后,炉况就变得不稳定了。经过冷模型实验证明,这是由于高炉炉身上部炉衬的损坏而引起的。该厂开发了用冷却管进行修补的新技术,此修补技术的效果好,成本低,且施工时间短。修补区域只限于高炉炉身上部,而且是在对修补效果和施工时间做了多次冷模型实验的基础上进行的。采用这种新的修补技术之后,高炉的炉况变稳定了,而且炉龄可以延长到10年以上。确立延长高炉寿命的技术,对炼铁部门来说是个非常重要的课题。以前高炉寿命为 Kashima Plant No. 3 blast furnace opened seven years later, the furnace became unstable. After cold model experiments show that this is due to the damage caused by the upper furnace lining of the blast furnace. The plant has developed a cooling tube for repair of new technologies, the effect of this patch technology, low cost, and the construction time is short. The repair area is limited to the upper part of the blast furnace shaft, and is based on several cold model experiments performed on the repair effect and the construction time. With this new patching technique, the blast furnace’s conditions have stabilized and the furnace age can be extended to more than 10 years. The establishment of technology to extend the life of the blast furnace is a very important issue for the iron-making sector. Blast furnace life before