Twin shaft lime kilns
Twin shaft lime kilns are a new type of pfr lime kiln developed by AGICO based on the technological innovation of ordinary double shaft lime kilns, More advanced technology. Twin shaft lime kilns consist of two kilns and the two kilns are connected.
Twin Shaft Lime Kilns for Sale
- Production Capacity: 50-1200t/d
- Limestone Particle Size: 30mm-60mm / 40mm-80mm
- Lime Activity Degree: Greater than 360ml
- Heat Consumption:No more than 860kcal/kg
- Fuel: natural gas, liquefied petroleum gas, heavy oil rtc.
Twin Shaft Lime Kilns Plant
Twin shaft lime kilns are also called double shaft lime kilns. They are a type of shaft lime kiln. Since they use a regenerative process when burning lime, they are also called parallel flow regenerative kiln (pfr kiln) and pfr lime kiln. Twin shaft lime kilns can be used in the steel industry, chemical industry, glass industry, construction industry, food industry agriculture, etc. Twin shaft lime kilns have the characteristics of a small footprint, low investment, high efficiency, and energy saving, and are the best choice for small enterprises in the production of high-reactivity and medium-reactivity lime.
Twin shaft lime kilns are a new type of pfr lime kiln developed by AGICO based on the technological innovation of ordinary double shaft lime kilns, More advanced technology. Twin shaft lime kilns consist of two kilns and the two kilns are connected. When one kiln is a heat storage chamber, the other kiln is a combustion chamber. The two kilns are alternately burned to ensure uniform heat distribution and sufficient calcination of lime, which greatly improves combustion efficiency and reduces energy loss.
The choice of parallel flow regenerative kiln (pfr kiln) should be based on the specific needs and actual conditions of the user. AGICO twin shaft lime kiln’s excellent regenerative process will bring you more benefits. If you need AGICO to help you choose and give you a more accurate quotation, please contact us!
Advantages of Twin Shaft Lime Kilns
Low Production Cost
The double shaft lime kiln has a relatively simple structure, so the investment is small. It is in an upright shape, small in size, and occupies a small area, which is the most suitable choice for manufacturers with limited plant area.
High Thermal Efficiency
The waste heat generated during the calcination of limestone in the double shaft lime kiln will be recycled and used for the next limestone calcination. The high thermal efficiency saves energy consumption.
Flexible Operation
Double shaft lime kiln only needs simple training to operate. It has high flexibility in temperature level and temperature curve. It can meet the diverse needs of different users by adjusting output, process parameters, and fuel.
Clean Production
The calcination system of the double shaft lime kiln has been optimized by the AGICO team, which has greatly reduced the emission of harmful gases, lowered sulfur content, and met environmental protection standards.
Working Principle of Twin Shaft Lime Kilns
- Feeding
The raw material limestone is delivered to the kiln through a hopper or a conveyor belt, and the fuel enters the kiln through a feeding system. The double shaft lime kiln has two kiln bodies, and the raw material and fuel are evenly distributed in the two kiln bodies.
- Preheating
The preheating zone is located at the upper part of the kiln body, so the limestone enters the preheating zone first. The high-temperature gas flows from bottom to top, heating the limestone to 800-900°C. At this time, part of the limestone decomposes and releases carbon dioxide.
- Calcination
The calcination zone is located in the middle or lower part of the kiln body. High-temperature flue gas and limestone flow in the same direction, which is called parallel flow. Then the fuel in the two kilns is burned alternately. When one kiln body is a heat storage chamber, the other kiln body is a combustion chamber, thus realizing heat recycling（regenerative）.
- Cooling
The cooling zone is located at the bottom of the kiln, and the calcined quicklime falls into the cooling zone. The cold air contacts the hot quicklime, increasing its activity, while the heated air is guided back to the preheating zone, which greatly improves the efficiency of the double shaft lime kiln and reduces energy loss.
Twin Shaft Lime Kilns Can Be Used in These Industries
Steel Industry
In the steel industry, lime can be used to remove sulfur and phosphorus, thereby adjusting the basicity of the slag. Parallel Flow Regenerative Kiln (pfr kiln) can produce the lime needed by the steel industry to improve the quality of steel.
Chemical Industry
In the chemical industry, sodium hydroxide, bleach, and cement are often needed, and their raw materials are the high-purity lime produced by Parallel Flow Regenerative Kiln (pfr kiln).
Construction Industry
A large number of bricks, concrete, and mortar used in the construction industry are made of lime. Lime produced by Parallel Flow Regenerative Kiln (pfr kiln) improves building safety and durability.
Food Industry
A large amount of wastewater is generated during food production. The lime produced by Parallel Flow Regenerative Kiln (pfr kiln) can reduce pollutants in wastewater and reduce pollution to the environment. It can be used in sugar factories, dairy factories, etc.
Technical Parameters of Twin Shaft Lime Kilns
| Feature | Direct Cross Over Channel | Radial Cross Over Channel | ||
|---|---|---|---|---|
| Structure | Two kiln tubes arranged in parallel with a channel between the kilns | Two kiln tubes arranged in a “V” shape with a circular channel connecting them | ||
| Advantages | Simple structure, high fuel utilization | High thermal efficiency, strong adaptability | ||
| Disadvantages | Low operational flexibility | Complex structure, high initial investment | ||
| Suitable Applications | Users prioritizing simple structure, ease of operation, and maintenance | Users prioritizing heat recovery efficiency and environmental performance |