by As the main equipment of short process steelmaking process, electric arc furnace plays a vital role in smelting production.
Electric furnace body mainly includes furnace cover, furnace wall and furnace bottom.
The service life of furnace cover has always been a main factor affecting the operation efficiency of electric arc furnace.
During the use of the furnace cover, due to the very bad working environment, the triangular area near the electrode must bear the high temperature of more than 2000 ℃.
At the same time, most of the high-temperature gas carrying a large amount of dust (mainly Cao, FeO, Fe2O3, etc.) in the furnace also escapes from the electrode hole, which has serious scouring on the furnace cover.
The materials in this part are required to have excellent high temperature resistance, scouring resistance and erosion resistance; The materials in the lower part of the periphery are radiated by the high temperature in the furnace, and the temperature is high.
The Splashed Slag adheres to this part and reacts with the furnace cover material, which will degrade its high-temperature performance.
Therefore, the slag resistance of the materials is required to be better.
At the same time, because the electric arc furnace belongs to intermittent operation, the furnace cover should be opened several times for each furnace steel smelting to add raw materials to the furnace, At this stage, the ambient temperature of the furnace cover changes to about 1700 ℃, which puts forward high requirements for the thermal shock stability of the furnace cover; The service conditions of the upper area of the periphery of the furnace cover are relatively better than other parts.
On the premise that the materials in this part meet the service temperature and structural strength, relatively lightweight materials can be used to reduce the overall weight of the prefabricated parts.
At present, the electric furnace cover in the industry generally adopts integral casting prefabricated parts, and the main materials are corundum, chrome corundum, high aluminum, mullite, etc.
The structure of the prefabricated parts of the electric furnace cover has also been continuously improved for a long time.
The purpose is to enable the electric furnace cover to obtain a higher service life, so as to save the time of changing the furnace cover, improve the operation efficiency of the electric arc furnace, reduce the expenditure cost of the furnace cover and reduce the consumption of refractory per ton of steel.
According to the different positions, United Rongda divides the furnace cover structure into three areas: triangle, upper part of the periphery and lower part of the periphery.
According to the service characteristics of each part, it makes targeted design for the materials used, overcomes the deficiency caused by the use of a single material that can not meet the service requirements of each part at the same time, and adopts composite casting technology at the same time, The seamless connection of the three materials not only improves the service life of the prefabricated parts, but also reduces the cost of steelmaking.
It has higher advantages than the single material furnace cover in the current market.
Light up the little golden flower at the bottom and let me know you are “watching”! Highlights of previous periods · a heat-resistant and fast curing ground repair technology · ladle carbon free prefabricated parts · a furnace bottom grouting technology · anti sticking slag high-temperature coating · the structure of blast furnace hearth ceramic cup affects the opening quality · the effect of water addition on the strength of cement bonded coating material · the application of integral pouring technology of large blast furnace ceramic cup · the optimization of the performance of tundish coating material · the effect of tundish covering agent on Erosion research of lining materials · operation tracking of integrally cast blast furnace hearth · solutions to curing and cracking of castables · application of rapid repair technology of blast furnace iron mouth · new lining materials and construction methods of new blast furnace · new furnace protection technology for increasing production and efficiency of converter · service life of large furnace cover of aluminum melting furnace has exceeded 10 years.
