延长干熄炉系统年修周期的实践探索
发布时间：2018-12-28 07:15
【摘要】：干熄焦技术是目前国内外冶金行业最先进的熄焦技术,干熄焦与湿熄焦相比在提高焦炭质量、改善环境、回收能源方面存在很大的优势,目前干熄焦作为冶金行业比较重要的节能和环保技术得到了广泛认可,在国内外得到了广泛应用。受干熄炉内部分耐火材料使用寿命的限制,必须定期对干熄炉进行停炉检修。通常干熄炉每隔1.5年左右检修一次,每次检修历时30天左右,这不仅浪费了大量的人力、物力、财力,同时给高炉生产带来不便。本论文总结了干熄炉的主要结构,概括了干熄炉系统的易损部位,对干熄炉内耐火材料损坏原因进行分析,对干熄炉内耐火材料的使用情况及研究进展进行介绍,总结了国内延长干熄炉斜道区使用寿命的相关方法。本论文结合包钢125t/h干熄焦装置的技术特点并对其历年检修进行统计分析,发现干熄炉斜道区牛腿的损坏是影响包钢干熄焦年修周期的主要因素,其次是一次除尘器内部耐火材料的损坏;对干熄炉内使用的耐火材料的理化性能进行试验测定,得出这部分耐火材料各项理化指标均达到设计要求;将氮化硅结合碳化硅砖这一新型耐火材料与传统碳化硅砖的理化性能进行对比分析,得出氮化硅结合碳化硅砖理化指标综合性能明显好于碳化硅砖;氮化硅结合碳化硅砖在包钢125 t/h干熄焦装置年修过程中成功应用于斜道区牛腿部位,有效延长了牛腿的使用寿命;同时在包钢2号干熄焦装置年修过程中成功对干熄炉及一次除尘器关键部位进行改进,对检修过程遇到的实际问题予以解决,为延长其使用寿命提供保障;结合包钢2号干熄焦装置斜道区损坏形式对斜道区进行受力分析,得出牛腿砖损坏主要是其受剪应力及在升温降温过程中牛腿拱水平环向产生拉应力所致,同时给出相应解决方案;通过对干熄焦气体循坏系统关键部件的改进,有效延长了这些部件的使用寿命;通过优化干熄焦相关生产操作保障干熄焦系统稳定;最后,通过介绍在线和停炉两种方式对包钢干熄炉内部耐火材料进行检查,实现了包钢干熄焦装置的年修周期显著延长。这些,为有效延长干熄炉系统年修周期提供实践经验和理论依据。
[Abstract]:Dry coke quenching is the most advanced coke quenching technology in metallurgical industry at home and abroad. Compared with wet coke quenching, dry quenching has great advantages in improving coke quality, improving environment and recovering energy. At present, as an important energy saving and environmental protection technology in metallurgical industry, coke dry quenching has been widely recognized and widely used at home and abroad. Limited by the service life of some refractories in the dry quenching furnace, the dry quenching furnace must be shut down and overhauled regularly. The dry quenching furnace is usually overhauled once every 1.5 years, which lasts about 30 days, which not only wastes a lot of manpower, material and financial resources, but also brings inconvenience to the production of blast furnace. This paper summarizes the main structure of the dry quenching furnace, summarizes the vulnerable parts of the dry quenching furnace system, analyzes the causes of the damage of the refractory material in the dry quenching furnace, and introduces the usage and research progress of the refractory material in the dry quenching furnace. The related methods for prolonging the service life of ramp section of dry quenching furnace in China are summarized. This paper combines the technical characteristics of 125t/h dry coke quenching device in Baotou Iron and Steel Co., Ltd, and makes a statistical analysis of its maintenance over the years. It is found that the damage of the corbel leg in the ramp area of the dry quenching furnace is the main factor affecting the annual repair period of the dry coke quenching unit in Baotou Iron and Steel Co. Secondly, the damage of refractory material inside the primary dust collector; The physical and chemical properties of the refractories used in the dry quenching furnace were tested, and the results showed that all the physical and chemical indexes of the refractories met the design requirements. The physical and chemical properties of silicon nitride bonded silicon carbide brick are compared with that of traditional silicon carbide brick. The comprehensive properties of silicon nitride bonded silicon carbide brick are obviously better than that of silicon carbide brick. Silicon nitride combined with silicon carbide brick was successfully used in the annual repair of 125t / h dry coke quenching unit in Baotou Iron and Steel Co. At the same time, the key parts of dry quenching furnace and primary dust collector are improved successfully in the annual repair process of No.2 coke quenching unit of Baotou Iron and Steel Co., and the practical problems encountered in the maintenance process are solved to provide guarantee for prolonging its service life. Combined with the damage form of ramp of No.2 coke quenching device of Baotou Iron and Steel Co., the stress analysis of the ramp area is carried out. It is concluded that the damage of the corbel brick is mainly caused by shear stress and the horizontal tensile stress of the corbel arch in the process of heating and cooling. At the same time, the corresponding solutions are given. By improving the key components of the system, the service life of these components is effectively prolonged, and the stability of the coke quenching system is ensured by optimizing the production operation of the coke quenching system. Finally, the internal refractories of Baotou Iron and Steel Co., Ltd are inspected by on-line and shutdown methods. The annual repair period of Baotou Iron and Steel Co. These provide practical experience and theoretical basis for effectively prolonging the annual repair period of dry quenching furnace system.
【学位授予单位】：内蒙古科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ520.5
[Abstract]:Dry coke quenching is the most advanced coke quenching technology in metallurgical industry at home and abroad. Compared with wet coke quenching, dry quenching has great advantages in improving coke quality, improving environment and recovering energy. At present, as an important energy saving and environmental protection technology in metallurgical industry, coke dry quenching has been widely recognized and widely used at home and abroad. Limited by the service life of some refractories in the dry quenching furnace, the dry quenching furnace must be shut down and overhauled regularly. The dry quenching furnace is usually overhauled once every 1.5 years, which lasts about 30 days, which not only wastes a lot of manpower, material and financial resources, but also brings inconvenience to the production of blast furnace. This paper summarizes the main structure of the dry quenching furnace, summarizes the vulnerable parts of the dry quenching furnace system, analyzes the causes of the damage of the refractory material in the dry quenching furnace, and introduces the usage and research progress of the refractory material in the dry quenching furnace. The related methods for prolonging the service life of ramp section of dry quenching furnace in China are summarized. This paper combines the technical characteristics of 125t/h dry coke quenching device in Baotou Iron and Steel Co., Ltd, and makes a statistical analysis of its maintenance over the years. It is found that the damage of the corbel leg in the ramp area of the dry quenching furnace is the main factor affecting the annual repair period of the dry coke quenching unit in Baotou Iron and Steel Co. Secondly, the damage of refractory material inside the primary dust collector; The physical and chemical properties of the refractories used in the dry quenching furnace were tested, and the results showed that all the physical and chemical indexes of the refractories met the design requirements. The physical and chemical properties of silicon nitride bonded silicon carbide brick are compared with that of traditional silicon carbide brick. The comprehensive properties of silicon nitride bonded silicon carbide brick are obviously better than that of silicon carbide brick. Silicon nitride combined with silicon carbide brick was successfully used in the annual repair of 125t / h dry coke quenching unit in Baotou Iron and Steel Co. At the same time, the key parts of dry quenching furnace and primary dust collector are improved successfully in the annual repair process of No.2 coke quenching unit of Baotou Iron and Steel Co., and the practical problems encountered in the maintenance process are solved to provide guarantee for prolonging its service life. Combined with the damage form of ramp of No.2 coke quenching device of Baotou Iron and Steel Co., the stress analysis of the ramp area is carried out. It is concluded that the damage of the corbel brick is mainly caused by shear stress and the horizontal tensile stress of the corbel arch in the process of heating and cooling. At the same time, the corresponding solutions are given. By improving the key components of the system, the service life of these components is effectively prolonged, and the stability of the coke quenching system is ensured by optimizing the production operation of the coke quenching system. Finally, the internal refractories of Baotou Iron and Steel Co., Ltd are inspected by on-line and shutdown methods. The annual repair period of Baotou Iron and Steel Co. These provide practical experience and theoretical basis for effectively prolonging the annual repair period of dry quenching furnace system.
【学位授予单位】：内蒙古科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ520.5
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8 夏q，
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