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高炉大型化以后,高炉座数减少,每座高炉风口数量增多,加以热负荷增大,更换破损风口休风次数频繁,严重影响铁产量与炉况稳定,因此日本二十多年来进行了大量延长风口寿命的研究工作,并取得了很大的成效,风口寿命由数十日提高到150～365日,近几年再提高至3年,经过再生处理多次,预期可用10年以上。1.风口破损情况统计分析高炉风口的工作环境恶劣,面临高温、高压、炉料磨损、铁渣熔损、碱、与渣的腐蚀、海绵铁与焦炭的氧化与烧损、冷却缺陷、炉况不顺等.风口破损主要是磨损、龟裂与熔损。前二者与使用日数有关,因此日本实行定期更换制度,部分或全部更换到期未破损的风口。此后风口熔损问题提到议事日程,据1970年4月至1972年3月统计,八幡
After the large-scale blast furnace, the number of blast furnaces decreased, the number of tuyeres in each blast furnace increased, the heat load increased, the number of breaks in replacement of damaged tuyeres was frequent, and the output of iron and furnace were seriously affected. As a result, Japan has conducted large quantities Extend the life of the tuyere, and achieved great results. The service life of the tuyere is increased from several dozen days to 150-365 days. In recent years, the service life of the tuyere is increased to three years. After several times of regeneration treatment, it is expected to be usable for more than 10 years. 1. The analysis of the damage of the tuyere The blast furnace tuyere has bad working environment and faces the problems of high temperature, high pressure, charge wear, molten iron loss, alkali and slag corrosion, sponge iron and coke oxidation and burning, cooling defects, furnace condition Shun etc .. Vents damaged mainly wear, cracking and melting loss. The former two are related to the number of days of use. Therefore, Japan implements a regular replacement system and partly or wholly replaces the intact tuyere. Since then the issue of tuyere melting loss referred to the agenda, according to statistics from April 1970 to March 1972, Hachiman