Due to factors such as high temperature, rapid cooling and heating, material erosion, mechanical stress, construction, etc., the refractory materials at the kiln entrance have a short service life, which restricts the operation rate of the kiln, and may even cause the castables to fall off and cause the kiln barrel to burn. During operation of a cement plant, a large amount of flying sand material appeared in the cold air jacket of the kiln head hood, and large particles of clinker leaked out. After stopping the kiln for inspection, it was found that the kiln barrel had a burning hole under the cold air jacket. Material leakage from outside.
Factors affecting the service life of refractory castables at the kiln mouth
1. Selection of refractory materials
During production, the kiln mouth castables are subject to long-term erosion by high temperatures, long-term abrasion of clinker, erosion by secondary air, and rapid cooling and heat caused by starting and stopping the kiln. Therefore, the castables at the kiln mouth should have high temperature corrosion resistance, wear resistance and good Thermal shock resistance.
2. Selection and construction of anchors
The material, shape, thermal expansion treatment, welding, etc. of the anchor directly affect the service life of the refractory material. The material generally cannot be lower than 0Gr25Ni20, and must be welded firmly. The anchor should be expanded, and the anchor should be painted with asphalt paint or wrapped. Tape.
3. Construction of refractory materials and control of water injection volume
The performance of refractory castables is closely related to the construction of the castables. During the actual construction process at the production and maintenance site, it often happens that the construction team only chooses the method that is convenient for construction. If the technicians fail to follow up properly, it is easy to cause The performance of refractory materials decreases and the service life is shortened. During the construction process, construction workers sometimes increase the amount of water injected to make the castables easier to pour and speed up the flow of the castables, resulting in a significant reduction in the strength and performance of the castables.
4. Baking of refractory materials
It plays a great role in the performance of castables. If the baking is not done well, it is easy for the refractory material to burst during the rapid heating process, causing the castables to fall off.
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