The Role of Refractory Lining in Heating Furnace

The heating furnace is mainly composed of a regenerator that is insulated by refractory materials, a furnace body that supports and transports heating elements, a furnace body, and a heat recovery system. The heating furnace uses oil, natural gas, electricity, and coal as the main fuel as the heat source. Of course, the furnace temperature and pressure can also be controlled manually.

The main function of the heating furnace is to heat the billet (billet, bloom, slab, ingot) to 1000-1250°C (rolling temperature) until it has enough plasticity to be rolled to the desired Section, size, or shape. Depending on the chemical composition and grade of the material, the required rolling temperature also changes. Depending on the metallurgical properties of the raw material and the productivity, the heating rate of the furnace is also adapted to meet specific requirements and goals. During furnace processing, a stream of material runs continuously through the furnace, heating the raw material to a certain temperature.

The heating furnace is divided into continuous heating furnaces, push steel heating furnaces, regenerative heating furnaces, and roller bottom heating furnaces. Depending on the heating capacity, material grade, and material shape, choose the appropriate furnace type. Furnaces used for the heat treatment of metals are also called heat treatment furnaces. The heating furnace before the initial rolling of the steel ingot or the heating furnace that makes the internal temperature of the steel ingot uniform is called a soaking furnace.

Refractories play an important role in controlling energy consumption and increasing furnace efficiency. The service life of the refractory lining and the production efficiency of the heating furnace largely depends on the correct selection of refractory materials, the design results of refractory materials, and accurate masonry methods.

The function of the refractory lining of the heating furnace is to prevent the heat loss of the furnace body, to ensure that the surface temperature of the heating furnace body is low, to meet the working conditions around the heating furnace body, and to help achieve the goal of unit fuel consumption. The design structure of the refractory material also fully considers the heat loss of the side wall, furnace roof, and furnace bottom.