Heating furnaces are divided into continuous heating furnaces, pusher heating furnaces, regenerative heating furnaces and roller hearth heating furnaces. Select the appropriate heating furnace type according to the different heating capacity, material grade and material shape. The heating furnace used for metal heat treatment is also called a heat treatment furnace. The heating furnace before rough rolling the steel ingot or the heating furnace that uniformizes the internal temperature of the steel ingot is called a soaking furnace.
The heating furnace mainly consists of a regenerator which is insulated with refractory material (dense insulation), a furnace body which supports and transports the heating elements, a furnace body and a heat recovery system. The heating furnace mainly uses oil, natural gas, electricity and coal as heat source fuel. Furnace temperature and pressure are controlled automatically, but of course can also be controlled manually.
Refractory materials play an important role in controlling energy consumption and improving furnace efficiency. The service life of the refractory lining and the productivity of the heating furnace depend to a large extent on the correct choice of refractory material, the design of the refractory material and precise masonry methods.
The role of the refractory lining of the heating furnace is to prevent heat loss from the furnace, to ensure that the surface temperature of the heating furnace body is low and to meet safe working conditions around the heating furnace body, thus contributing to the achievement of unit fuel consumption targets. The refractory design structure also takes into account the minimization of heat loss from the side walls, roof and bottom of the furnace.
Nowadays, the refractory materials of masonry heating furnaces are increasingly using integral structural refractory materials, replacing the previous refractory bricks. The main advantage of improving from refractory bricks to integral refractory structures is to reduce furnace downtime and improve furnace production efficiency. The integral furnace lining can also minimize the intermediate downtime and maintenance costs for relining refractory materials, and can also improve the thermal stress caused by frequent cooling and heating during maintenance and repairs. If refractory bricks are used, the refractory brick structure has a large number of joints, and hot gas can easily transfer heat through the refractory brick lining, causing the temperature of the furnace shell to rise. However, the overall refractory lining structure has a small number of joints, which has a negative impact on the furnace shell.
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