As an important equipment in lime production, the design of the kiln body structure of the lime kiln vertical kiln is directly related to the yield and quality of lime. From the top to the bottom of the vertical kiln, the kiln body is carefully divided into three parts: pre heating zone, calcination zone, and cooling zone. Each part carries different functions and functions, together forming the core process area of the lime kiln vertical kiln.
1、 Pre tropical zone
The pre heating zone is located at the top of the lime kiln shaft and is the first area that limestone passes through after entering the kiln body. The main purpose of this area is to preheat the limestone entering the kiln and prepare for the subsequent high-temperature calcination process. In the pre tropical zone, limestone gradually absorbs heat by coming into contact with the rising hot air flow, and its temperature gradually rises. Water and gas inside begin to escape, creating favorable conditions for subsequent decomposition reactions.
The design of the pre heating zone fully considers the physical and chemical properties of limestone. Through reasonable airflow layout and temperature control, it ensures that limestone can be uniformly heated during the preheating process, avoiding local overheating or insufficient temperature. At the same time, the pre heating zone is also equipped with professional dust removal equipment, effectively reducing dust pollution generated during the preheating process, ensuring the cleanliness and safety of the production environment.
2、 Calcination zone
After pre heating the limestone, the temperature has reached the required conditions for calcination, and then it enters the calcination zone. The calcination zone is located in the middle of the lime kiln shaft and is the main area for high-temperature decomposition reaction of limestone. In this area, limestone undergoes decomposition reactions at high temperatures of up to thousands of degrees, releasing a large amount of carbon dioxide gas and forming quicklime.
The design of the calcination zone fully considers the decomposition characteristics of limestone and its stability in high-temperature environments. By precisely controlling the temperature and airflow distribution inside the kiln, it is ensured that limestone can be uniformly heated and fully decomposed. At the same time, the calcination belt is also equipped with professional combustion equipment and waste gas treatment equipment, ensuring the efficiency, safety, and environmental protection of the combustion process.
During the calcination process, the color of limestone gradually changes from gray to white or light yellow, and the texture also becomes harder and denser. This is because at high temperatures, compounds such as calcium carbonate in limestone undergo decomposition reactions, producing calcium oxide and carbon dioxide. This reaction process not only changes the physical and chemical properties of limestone, but also provides possibilities for its subsequent applications.
3、 Cooling belt
After calcination, the temperature of quicklime can reach thousands of degrees, and it needs to be cooled before further application. Therefore, a cooling belt is installed at the bottom of the lime kiln vertical kiln. The main function of the cooling belt is to cool down the high-temperature quicklime to reach a suitable storage and application temperature.
In the cooling zone, quicklime gradually lowers the temperature by coming into contact with the descending cold air flow. At the same time, the cooling belt is also equipped with professional ventilation and heat dissipation equipment, ensuring that quicklime can quickly and evenly cool down. After cooling treatment, the quicklime can be discharged from the kiln through the discharge device after its temperature drops to a suitable range, and then enter the subsequent storage and application process.
The kiln body of a vertical lime kiln is divided into three parts from top to bottom: pre heating zone, calcination zone, and cooling zone. Each part carries different functions and roles, together forming the core process area of the lime kiln vertical kiln. By precisely controlling the temperature and airflow distribution in each area, it ensures that limestone can be uniformly heated, fully decomposed, and quickly cooled to a suitable temperature range, providing assurance for subsequent storage and application.