Dry process cement rotary kiln is a key equipment for cement clinker calcination, mainly composed of rotary kiln, cooler, coal injection system and fan and chimney for driving gas flow. In dry process cement rotary kiln, the use of unshaped refractory materials is crucial to improve the service life of kiln, reduce heat loss and protect the normal operation of production equipment at high temperature. At present, the commonly used unshaped refractory materials in dry process cement rotary kiln are mainly the following:
HMS wear-resistant castable: mainly used for kiln mouth of large cement rotary kiln, with the advantage of abrasion resistance, can resist the wear and erosion of raw materials.
Corundum high-strength refractory castable: mainly used for kiln mouth, top of grate cooler and coal injection pipe, and also widely used in decomposition furnace, preheater, tertiary air duct, kiln door cover and cooler.
High-aluminum low-cement castable: mainly used for wear-resistant parts of cooling pipe and cone of preheater, with good thermal shock resistance and mechanical shock resistance.
Anti-scaling castable: used in the parts of the pre-decomposition system that are prone to crusting and clogging, such as the preheater feeder, the ascending flue, the preheater cone, etc., with anti-chemical erosion performance, effectively preventing harmful gases from chemically corroding the refractory castable.
High-strength alkali-resistant castable: used in the pre-decomposition system to resist the chemical erosion of harmful components such as alkali, chlorine, and sulfur in the raw material.
In addition, according to specific conditions of use and requirements, other types of amorphous refractory materials may also be used, such as mullite castables, andalusite castables, silicon carbide bricks, wear-resistant high-alumina bricks, etc. The selection and use of these materials need to take into account multiple factors such as the operating temperature of the kiln, raw material characteristics, mechanical stress, and chemical erosion.
There are many types of amorphous refractory materials used in dry cement rotary kilns, and each material has its specific application scenarios and performance advantages. By rationally selecting and using these refractory materials, the service life and operating efficiency of the kiln can be effectively improved.
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