SEARCH

A vertical furnace body with continuous feeding is used to calcine limestone, so that the limestone is decomposed into quicklime CaO and carbon dioxide CO2 under high temperature conditions.

The working principle of the lime kiln ‌ mainly includes the following steps: First, the limestone is crushed and screened before entering the kiln body for calcination. During the calcination process, the fuel (such as coal, natural gas, etc.) is mixed with air and burned to generate high temperature, which decomposes the limestone into quicklime. The design of the kiln body usually includes the feeding system, combustion system, and discharge system to ensure that the limestone can be heated evenly and complete the chemical reaction. ‌

‌ Several common problems in the production process of lime kilns include raw burning, overburning, upward or downward movement of the calcination zone, nodules, and kiln deviation.

• Raw burning refers to the failure of limestone to be completely decomposed during the calcination process, resulting in the formation of undecomposed calcium carbonate in the quicklime.
• Overburning refers to the excessive decomposition of limestone due to excessive temperature or long time during the calcination process, resulting in dense over-burned lime or dead burnt lime.
• Calcination zone moves up: caused by small fuel particle size or small ash unloading and large ventilation.
• Calcination zone moves down: caused by large ash unloading, insufficient air volume or excessive fuel particle size.
• Nodule: due to excessively high local temperature in the kiln, nodules are formed on the surface of limestone.
• Kiln deviation: caused by uneven distribution or uneven ventilation.

Benefits brought

• 

  ‌Safety warning function‌

• 

  Optimize the combustion and ventilation process‌

• 

  Predictive maintenance