In the cement industry, as a key refractory material, high alumina brick has a wide range of important applications, and plays an indispensable role in the efficient and stable operation of the cement production process.
1. Cement rotary kiln lining
Cement rotary kiln is the core equipment of cement production, and its internal working condition is very harsh. High alumina brick has excellent performance in transition zone and firing zone of rotary kiln. In the transition zone, the temperature fluctuation is frequent and large, and the high alumina brick can effectively cope with the stress impact caused by the temperature change by virtue of its good thermal shock resistance, so as to avoid cracking or spalling of the brick body. In the firing zone, the high refractoriness of high alumina bricks (up to 1750℃ -1790 ℃) makes it able to withstand high temperature environment of up to 1400℃ -1450 ℃, and its good wear resistance can resist the erosion and wear of high temperature clinker particles. In addition, the chemical reaction between high alumina bricks and cement clinker is relatively weak, which can maintain a stable lining structure for a long time, reduce the number of kiln stops and repairs caused by liner damage, thus significantly improving the continuity and efficiency of cement production and ensuring the quality and stability of cement clinker.
2. Cement kiln pre-decomposition system
The pre-decomposition system of cement kiln includes preheater, decomposition furnace and so on. In the preheater, high alumina brick can be used for the lining of all levels of cyclone. Due to the fast airflow speed in the preheater, high material concentration and containing a certain amount of alkali, chlorine, sulfur and other harmful components, the dense structure and erosion resistance of high alumina brick can effectively resist the erosion and erosion of these harmful substances and material particles, prevent the premature appearance of crust phenomenon, maintain good ventilation and heat exchange efficiency in the preheater, and ensure that the cement raw material can be fully preheated and decomposed. The environment inside the calciner is equally complex, where the high alumina bricks can withstand high temperatures and frequent temperature changes to ensure the normal operation of the calciner, provide a stable space environment for the efficient decomposition of cement raw materials, promote the collaborative work of the entire pre-decomposition system, and improve the overall efficiency of cement production.
3. Cement kiln cooling machine
Cement kiln coolers such as grate coolers, in the cooling process of cement clinker, its interior also needs high temperature and wear resistant lining materials. High alumina brick can be used in the high temperature area and some key parts of the grate cooling machine. In the high temperature area, the high alumina brick can withstand the high temperature radiation of the clinker waste heat and the friction of the clinker particles, and its good thermal stability helps to maintain the integrity of the cooling machine lining structure and prevent the failure of the lining due to local overheating or wear. At the same time, the use of high alumina bricks can reduce the air leakage phenomenon inside the cooling machine, improve the cooling efficiency, and then affect the cooling effect of cement clinker and the quality of subsequent cement products, and reduce the maintenance cost and energy consumption of the cooling machine, and provide strong support for the energy saving and stable operation of cement production. In summary, high alumina bricks play an extremely important role in each key link of the cement industry, and its performance characteristics are highly matched with the requirements of the cement production process, which is one of the important guarantees for the efficient, stable and sustainable development of the cement industry.
