Research and Application of Alumina Clinker Kiln Residual Heat as Heat Source for Pulverized Coal Preparation

During the clinker sintering process, a large amount of waste from the kiln head is directly discharged into the atmosphere, which endangers the quality of the ambient air and wastes a lot of heat. The pulverized coal preparation process is a process that requires high safety, and the pulverized coal is dried for many years. Hot air is always supplied by the burner. Once the flame is pulled into the pulverizer, it will cause unpredictable safety accidents. In view of the above reality, after a series of arguments, we believe that the temperature of the kiln exhaust gas is sufficient to ensure the required temperature for the preparation of pulverized coal, and it does not bring an open flame, which is more conducive to safe production.

The residual heat of the kiln kiln system is introduced into the air supply system of the pulverized coal mill through a hot air pipe, air flow and temperature control means are set, the combustion furnace is deactivated to supply high-temperature gas, and the kiln exhaust gas is used as an alternative to the hot air of the combustion furnace. The raw coal is dried and fed to obtain qualified coal powder. Play a large capacity of coal grinding.

Kiln head waste temperature ≥450 °C, enough to ensure that the temperature required for the preparation of pulverized coal ≤ 350 °C, and without an open flame, more conducive to safe production. However, the clinker sintering and the change of the negative pressure in the pulverized coal preparation system caused the impact on the production operation and product quality, as well as the problem of the influence of a certain amount of kiln dust entering the pulverized coal mill on the coal ash content with the hot air, becoming the technology. The difficulty of innovation. Through the chemical analysis of the coal ash during the experiment, the technical transformation was carried out for the changes in the kiln ash sedimentation chamber and the actual conditions of the kiln dust into the mill, ensuring that the ash content of the coal powder is ≤ 15%. Through experiments, we obtained the technical operating parameters suitable for this process, which not only ensured the quality of coal powder (moisture ≤2.0%, fineness of 90μm≤16%, ash content≤15%), but also ensured the preparation of clinker kilns and pulverized coal. The normal operation of the system.

This project utilizes the residual heat of alumina clinker as a heat source for the preparation of coal powder and has successfully applied it to the large flow of sintering alumina production. The operation is safe, reliable, conducive to environmental protection, and has created good economic and social benefits.

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