Ensure Proper Operation of Internal Equipment of Lime Kiln
The equipment inside the lime kiln is often hidden for long periods, making it difficult to detect problems. Once problems arise, they are also difficult to solve. Therefore, it is extremely important to ensure the proper operation of the internal equipment of lime kiln. By adding lubrication devices, wear and tear can be reduced, and major hazards such as disc deviation can be eliminated. Lime kiln technology is developing towards a better direction. By identifying the current deficiencies and transforming them into the products we desire, we can effectively improve the overall efficiency of the lime kiln.
For vertical lime kilns, the distribution of the furnace material must include a preheating layer, a calcination layer, a cooling layer, and a finished product layer. Each layer has strict temperature requirements and control. The temperature at the top of the preheating layer, or furnace top, should be maintained below 100°C. The calcination layer should maintain an ideal temperature of around 1100°C to produce the best quality lime. The cooling layer must quickly cool the lime crystals produced by the calcination and form the finished product. The lower the temperature of the finished product layer, the better, typically below 100°C. It is essential to ensure the stable temperature of the furnace material layers and prevent tilting. The equipment for ash removal is also crucial. Many ordinary vertical kilns lack sealing and continuous ash removal devices, resulting in uneven ash removal and requiring the cessation of wind during ash removal, causing problems such as deviation and instability, lower production, and increased overburning. Calcining lime is a continuous production process. Interrupting the combustion-assisting wind during ash removal is a major taboo for lime calcination. Due to the rudimentary design of ash removal equipment, sealing during ash removal has always been a problem for many kilns. If combustion-assisting wind is not interrupted during ash removal, it will leak through the ash removal channel, polluting the environment and making ash removal difficult. Therefore, the only option is to cease the wind during ash removal. The disadvantage of this method is that it causes a soft interruption of the lime calcination process. Although the calcination layer is not extinguished, the rational calcination temperature cannot be maintained, greatly reducing production and increasing overburning rate due to changes in temperature and height of the calcination layer.
Characteristics of Different Lime Kilns
The lime kiln is the main equipment for producing lime. With the gradual implementation of various national economic construction projects, the demand for lime has increased significantly. However, traditional earthen kilns have been prohibited due to their high energy consumption, low thermal efficiency, high overburning rate, and severe pollution. Nowadays, new mechanical kilns are commonly used, mainly divided into vertical lime kilns and rotary kilns. Which type of lime kiln is more economical and environmentally friendly?
Let us compare them. First, the rotary kiln is a larger production capacity kiln type commonly used in the steel industry to produce lime with high activity, low levels of carbon dioxide, sulfur, and phosphorus. The advantages of this type of kiln include large-scale production up to 2,000t/d and Can burn small particle lime, what’s more, it’s easy to operate, simple to stop and restart. The mechanized vertical lime kiln is a common type of kiln used in chemical production. Feeding and unloading are both mechanized, and each calcination zone has an automatic temperature recorder. This type of kiln has the following advantages: 1. High preheating and cooling efficiency, high thermal efficiency; 2. Small footprint; 3. Low equipment cost, few auxiliary equipment, and low investment.
The lime kiln is the “heart” of the lime kiln cement plant, and its kiln type plays a crucial role in the production quality and thermal consumption of the entire cement plant. A good kiln type can achieve both energy saving and high production, while a poor kiln type not only consumes more energy but also results in poor production quality.
