What is the core technology of lime vertical kiln calcination
The calcination process of lime vertical kiln directly affects the quality and production efficiency of lime, and its core technologies mainly include raw material control, temperature management, airflow distribution, and calcination process optimization.
1. Raw material control technology
The particle size, purity, and uniformity of limestone are the basis for calcination. High quality limestone (CaCO3 content ≥ 90%) can improve decomposition efficiency, while a reasonable particle size (40-80mm) ensures uniform calcination and avoids raw or over burning.
2. Precise temperature control
The calcination temperature is usually controlled between 900-1200 ℃. Too low a temperature can lead to insufficient activity of lime (CaO), while too high a temperature can easily form burnt lime, reducing product quality. Modern vertical kilns use thermocouples and infrared temperature measurement for real-time monitoring, combined with intelligent combustion systems to regulate gas or coal powder supply, ensuring temperature stability.
3. Optimization of airflow distribution
The airflow distribution inside the vertical kiln directly affects the uniformity of calcination. By designing the air cap, air distribution plate, and induced draft system reasonably, the hot air flow can rise uniformly, avoiding local high or low temperature areas, improving thermal efficiency, and reducing energy consumption.
4. Optimization of calcination process
Traditional vertical kilns use counter current calcination (limestone from top to bottom, hot gas flow from bottom to top), while modern technology combines oxygen rich combustion, waste heat recovery, etc. to further improve thermal efficiency and reduce CO ₂ emissions.
The core of lime vertical kiln calcination lies in the coordinated control of raw materials, temperature, airflow, and process. The application of advanced monitoring and intelligent regulation technology makes vertical kiln calcination more efficient, energy-saving, and environmentally friendly.
