Vertical Shaft Kiln Active Lime Plant Lime Kiln Production Line

Working principle:
The vertical kiln is a cylindrical equipment with an all-steel structure. The materials are added from the top of the kiln and discharged from the bottom of the kiln after calcination. Lime is burned by using the principle of heat exchange between the downward movement of the materials and the rising heat of the hot air. According to the temperature change and distribution in the vertical kiln, the vertical kiln is divided into three areas from top to bottom: preheating zone, calcining zone, and cooling zone; in the preheating zone, the materials are preheated with the heat of the flue gas; in the calcining zone, the materials are calcined with the heat released by the combustion of the fuel; in the cooling zone, the calcined materials exchange heat with the blown cold air, the materials themselves are cooled, and the air is heated and enters the calcining zone as combustion air. In order to ensure that each section of the material calcination process is fully and completely carried out, the three zones in the vertical kiln should maintain a certain height and strive to be stable. There are two reasons for the movement of materials in the vertical kiln: one is the movement of the upper material due to the volume contraction of the material during the calcination process; the other is the movement of the whole kiln material due to the discharge of the lower material. During the descent process, the material undergoes a complex heat exchange with the hot coal gas, accompanied by the decomposition of limestone and the growth of quicklime grains. When the whole process is completed, it is also cooled by the combustion air to a temperature 60°C higher than the ambient temperature. Then, the lime is unloaded onto the belt conveyor outside the furnace by the disc ash discharger and the two-stage sealing valve without leaking the combustion air. It has stable and reliable operation, environmental protection and energy saving, and a high degree of automation. It can use various low calorific value converters, blast furnace gas, calcium carbide furnace tail gas, etc. as fuel. The cooling air carrying heat enters the calcining zone to participate in combustion, thereby reducing energy consumption; the remaining hot flue gas after the fuel combustion releases heat to calcine material enters the preheating zone to preheat the material at room temperature to pre-decomposition temperature.

Specification: