- Time:Apr 04, 2023
With the maturation of domestic hot blast stove technology, the requirements for refractory bricks in the furnace are becoming increasingly strict, especially in the high temperature area, where the temperature in the furnace is as high as 1300 ° C. Therefore, for example, the upper part of the regenerator and the combustion chamber are most vulnerable The erosion of high-temperature gas makes it more vulnerable to damage, which directly affects the use effect and life of the hot blast stove. Therefore, the development and development of refractory bricks for long-life hot blast stoves has become the goal of joint efforts of experts and scholars in the refractory industry.
In actual engineering operations, there are many types of refractory bricks used in the masonry of hot blast stoves, as follows:
1. Low creep series
The series of refractory bricks used in hot blast stoves are mainly low-creep high-alumina bricks and low-creep clay bricks.
(1) Low-creep clay bricks for hot blast stoves use high-quality clay clinker as the main raw material, and are formed by high-pressure molding and high-temperature sintering. The main refractory material for medium and low temperature parts.
(2) Low-creep high-alumina bricks are high-grade refractory materials made of super-grade bauxite, fused corundum, and fused mullite as the main raw materials. The product has the characteristics of high refractoriness, high load softening temperature and strong slag resistance.
The low-creep high-alumina bricks produced by ZHENJIN REFRACTORIES use high-temperature calcined super-grade bauxite and add three stones. The phase transformation of three stones at high temperatures changes the internal structure of high-alumina bricks, and the crystal phase changes and micro-crack toughening also change. Under high temperature conditions, the mullite reaction can be produced slowly and continuously, and the volume expansion can occur at the same time, which can offset and compensate the high temperature creep of the kiln.
2. Silica bricks for hot blast furnace
Silica bricks for hot blast stoves are silicon refractory products with tridymite as the main crystal phase. It is mainly built in the high temperature part of the blast furnace hot blast stove. Silica bricks for hot blast stoves have hot spots such as stable volume, low creep, good thermal shock resistance, and good chemical corrosion resistance.
3. Andalusite bricks for hot blast stove
Andalusite bricks for hot blast stoves are high-grade refractory bricks among silicon-aluminum refractory materials, which have very good thermal shock resistance and creep resistance. It is mainly used in key parts such as hot air outlet and hot air stove door.
4. High alumina heat insulation bricks for hot blast stove
High-alumina heat-insulating bricks are manufactured by foam production technology, which has the advantages of small bulk density, high compressive strength, high load softening, small dimensional tolerance, and excellent thermal stability, which can effectively improve thermal efficiency, reduce energy consumption, and improve working conditions. , Improve production efficiency and achieve considerable economic benefits. It is mainly used for the heat insulation layer of the hot blast stove.
According to the actual working conditions of each part of the hot blast stove, choosing the appropriate type of refractory brick is a very effective way to extend the life of the hot blast stove. ZHENJIN REFRACTORIES is committed to one-stop general contracting services such as research and development, technical solution design, construction and supporting product provision of refractory materials in the cement, lime, non-ferrous, steel, glass and chemical industries. Kiln overall solution service provider. The service chain runs through the entire life cycle of the project, including preliminary consultation, scheme design, R&D and production, furnace construction and safety production. Through the optimized combination of various brand products, it can meet different process requirements and create value for customers.
