For large scale lime production, the annular sleeve lime kiln is an upgraded type on the basis of shaft lime kiln. This new design of lime kiln has an inner sleeve added inside the main shaft. Therefore, it forms a stable countercurrent heat exchange between the inner and outer sleeves. Today we take 600TPD annular sleeve lime kiln as an example, let’s explore the suitable refractory configuration and characteristics!
Main Advantages of Annular Sleeve Lime Kiln
Convenient Construction
This new kind of lime kiln operates under negative pressure. Outside air to flow into the kiln rather than escape. So daily inspection and maintenance easier. Moreover, the negative pressure ensures that flue gas and dust are drawn into the chimney system rather than leaking into the operating area. It creates a cleaner and safer working environment for workers.
Annual Operation Rate Over 95%
Current annular sleeve lime kilns automatically adjust temperature, airflow and pressure, minimizing damage to the kiln caused by thermal shock. Consequently, frequent kiln shutdowns for maintenance are virtually unnecessary. The annual operation rate exceeding 95%. Furthermore, the optimal refractory configuration can extend the relining interval to 5-6 years.
Low Fuel Costs
Compared to traditional vertical lime kilns and rotary lime kilns, the new annular sleeve lime kiln reduces lime heat consumption by approximately 20%. Because the gas flows upward from the bottom and the limestone flows downward from the top, this creates a sufficient heat exchange and fully utilizes the fuel’s calorific value. Besides, it also requires lower fuel pressure, allowing it to burn low-calorific-value gas without boosting. The fuel costs have an overall reduction!
Main Parameters of Annular Sleeve Lime Kiln
Production Capacity of 600TPD Annular Sleeve Lime Kiln
| Production of Lime Kiln | Parameter |
| Daily Capacity | 600 tons (Qualified Raw Materials) |
| Activity | ≥350 ml (4NHCl) |
| Heat Consumption | 980×4.18 kJ/kg |
| CaO | ≥91% |
| Calcination Degree | ≥95% |
| Limestone Consumption | 1.8kg limestone per 1kg lime |
| Annual Operating Days | ≥330 Days |
| Fuel | Various gas fuels |
| Calcination Technology | Annular Shaft Kiln Technology |
Sizes of 600TPD Annular Sleeve Lime Kiln
- Total kiln height: 50,800 mm;
- Cross-sectional area: 30.92 m²;
- Effective height: 26,800 mm;
- Preheating zone height: approximately 9 m;
- Calcination zone height: approximately 11 m;
- Cooling zone height: approximately 7 m.
Refractory Configuration for a 600TPD Annular Sleeve Lime Kiln
Refractory configuration is crucial to the kiln’s operating life and energy efficiency. The total refractory consumption for a 600TPD annular sleeve lime kiln is approximately 1,400 tons (excluding losses). The structure consists of six main components: shell lining, upper/middle/lower inner sleeves, arch bridge and support, combustion chamber and flue.
Refractory Configuration for the Preheating Zone
Working Layer: High alumina brick, dense fireclay bricks (1500°C, 270mm thickness);
Insulation Layer: Alumina silicate fiber board (30mm), fire clay insulation bricks (115mm), high strength refractory castable (20mm);
Total Thickness: 435mm.
Refractory Configuration for the Calcination Zone
Working Layer: Magnesia alumina spinel bricks, magnesia bricks (1500°C, 270mm thickness);
Insulation Layer: Ceramic fiber blanket or felt (40mm), lightweight fire clay insulation bricks (114mm), calcium silicate board (80mm), high strength refractory castable (46mm);
Total thickness: 550mm.
Refractory Configuration for Cooling Zone
Working layer: High alumina bricks, dense fire clay bricks (1500°C, 270mm thickness)
Insulation layer: Ceramic fiber blanket or felt (40mm), lightweight fire clay insulation bricks (114mm), calcium silicate board (80mm), high strength refractory castable (46mm);
Total thickness: 550mm.
Why is the Refractory Configuration of Lime Kiln Important?
- Extend kiln life: Professional refractory lining can extend the maintenance cycle to over 5 years.
- Reduced energy consumption: High quality kiln insulation layer effectively reduces heat loss and saves fuel costs.
- Ensure lime quality: High alumina bricks and magnesia bricks are resistant to high temperatures and corrosion, ensuring high activity and stability of the lime.
- Reduced operating costs: Reduced raw material waste and improved production overall efficiency.
Get a Customized 600TPD Lime Kiln Solution
As a professional lime kiln refractory supplier, KERUI Refractory offers:
- Factory direct supply refractory product at competitive prices;
- Customized CAD design and construction solutions;
- On-site technical guidance and after-sales service;
- Extensive engineering experience with exports to over 50 countries;
Contact us now for a customized quote on our 600TPD lime kiln production process and refractory configuration!
