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The alumina rotary kiln is the key and core equipment for the sintering process to produce alumina. The performance of its burner, the service life of its lining, the stability of its support system, the stability of its transmission system, the wear resistance and oxidation resistance of the bricks at the kiln head under high temperature, and the stability of the rotary kiln exhaust system are all crucial factors determining the cycle, safety, and efficient operation of the rotary kiln.
The alumina rotary kiln adopts bearing transmission, significantly reducing electricity consumption. Compared with the same level of alumina rotary kilns, production increases by 50%, and energy consumption decreases by 30%.
The alumina rotary kiln belongs to the category of metallurgical chemical kilns. It can also be used in the metallurgical industry for the roasting of lean iron ore at steel plants, roasting of chromium and nickel iron ore, roasting of refractory material plants for roasting high metallurgical ore, and roasting of clinker and aluminum plants for roasting alumina hydrate and chemical plants for roasting chromite sand and chromite powder.
From the perspective of chemical unit operations, the operation of an alumina rotary kiln involves the rational handling of solid and gaseous media in a heterogeneous heat and mass transfer process. This operation requires high technical skills and involves many variables, making it much more challenging than the heterogeneous heat and mass transfer process between gases and liquids. The alumina rotary kiln is a rotating cylinder set at a small angle to the horizontal line. When the cylinder rotates, the materials inside gradually move forward as they turn over and over along the inner wall of the kiln. As they move, they keep turning over, allowing the gas in the kiln to come into constant contact with the newly exposed materials, facilitating the heterogeneous heat and mass transfer operations.
The alumina rotary kiln is installed at a certain inclination, with materials continuously moving from the high end to the low end of the kiln. The rotational speed and the size of the gear and sealing device are determined by the kiln diameter, making the diameter of the kiln a crucial factor.
The length of the alumina rotary kiln is determined first to ensure the completion of the reaction process inside the kiln, and secondly to consider the amount of water vapor in the flue gas at the kiln end and the requirements for satisfying the dust collection technology conditions.
To ensure the efficient operation of the alumina rotary kiln, temperature monitoring is essential.The infrared thermal imaging kiln body temperature monitoring and early warning system provides a true dynamic kiln body condition display. The image is composed of temperature readings, with each pixel representing a temperature value, displaying the status of the kiln body temperature in real-time. This allows for clear visualization of changes in the kiln body temperature, kiln skin thickness, ring development trends, and whether refractory bricks are falling off or thinning. It enables the timely setting of high-temperature alarm values to detect abnormal high-temperature points or areas promptly, guiding process personnel to adjust parameters and ensure the safe and stable operation of the kiln system.
As a crucial piece of equipment in industrial production, the alumina rotary kiln not only improves production efficiency but also greatly enriches our lives. With technological advancements, it is believed that the alumina rotary kiln will showcase its charm and strength in more fields in the future.
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