Lime Rotary Kiln
Capacity: 180-10000t/h
Weight: 149.61-1659t
Specification: Φ2.5×40-Φ6.0×95
Application: mainly apply for lime production line, cement production line, and calcium carbonate processing production line, etc.
Lime rotary kiln has many advantages in the calcination of lime, it is also known as the lime kiln, and is a professional, strong calcining equipment, Its main advantages include great production capacity, no noise, low energy consumption, and so on.
As the main equipment of lime calcination plant, it has a very high industrial value, so the demand for the lime rotary kiln is very high, and becomes the ideal equipment for the masses of users in the lime processing.
Aiming at the calcination characteristics of limestone, a new type of cement kiln for active lime has been developed on the basis of absorbing and learning from similar rotary kilns at home and abroad.
Advantages of lime rotary kiln
The lime rotary kiln produced by AGICO CEMENT has the characteristics of a high utilization rate of raw materials, uniform quality, good quality, large capacity, high turnover rate, and easy operation.
- New technology: the main drive system adopts a new type of AC frequency conversion speed regulation technology. Compared with traditional electromagnetic speed regulation and DC speed regulation, it is more energy-saving and environmental protection and has a wide range of speed regulation, high efficiency, and high-speed regulation precision, and stable operation.
- Installation accuracy and reliability: After welding the base of the supporting device of the supporting wheel and the retaining wheel, and eliminating the welding stress through vibration aging treatment, integrated processing and manufacturing can be carried out by using a large vertical lathe and boring and milling machine, which can guarantee the machining accuracy and shape and position tolerance requirements of each part and significantly improve the installation accuracy and reliability of the whole machine.
- Smooth operation: According to the characteristics of limestone and its’ calcination process requirements, the overall structure optimization design was carried out for kiln head and end sections, which solved the problems of return materials of kiln tail and dust leakage commonly existed in common rotary kilns, making the transportation more smooth and natural.
- Stable quality: The limestone is uniform in heat, stable in product quality, low in over-burnt rate, especially suitable for calcination of high activity lime for steelmaking;
- Flexible process configuration: vertical preheater can be configured at the end of the kiln to make full use of the high-temperature flue gas calcined in the lime rotary kiln, preheat the limestone from normal temperature to the initial decomposition state, improve the product activity, and facilitate transportation and storage.
Specifications of lime rotary kiln
| Capacity （t/d） | 150 | 200 | 250 | 300 | 350 | 400 | 500 | 600 | 750 | 800 | 1000 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Product | Active lime , Calcined dolomite | Active lime , Calcined dolomite | Active lime , Calcined dolomite | Active lime , Calcined dolomite | Active lime , Calcined dolomite | Active lime , Calcined dolomite | Active lime , Calcined dolomite | Active lime , Calcined dolomite | Active lime , Calcined dolomite | Active lime , Calcined dolomite | Active lime , Calcined dolomite | |
| Preheater | Circular vertical preheater or polygonal vertical preheater | Circular vertical preheater or polygonal vertical preheater | Circular vertical preheater or polygonal vertical preheater | Circular vertical preheater or polygonal vertical preheater | Circular vertical preheater or polygonal vertical preheater | Circular vertical preheater or polygonal vertical preheater | Circular vertical preheater or polygonal vertical preheater | Circular vertical preheater or polygonal vertical preheater | polygonal vertical preheater | polygonal vertical preheater | polygonal vertical preheater | |
| Rotary kiln | size（m） | Φ2.5×40 | Φ2.8×42 | Φ3×46 | Φ3.2×50 | Φ3.5×54 | Φ3.6×56 | Φ3.8×58 | Φ4×60/Φ4.2×50 | Φ4.3×58 | Φ4.3×64 | Φ4.8×68 |
| Effective volume （m3） | 142 | 190 | 235 | 292 | 390 | 430 | 505 | 575/548 | 670 | 738 | 1005 | |
| Temperature （℃） | 1350/1250 | 1350/1250 | 1350/1250 | 1350/1250 | 1350 | 1350 | 1350 | 1350 | 1350 | 1350 | 1350 | |
| Cooler | Square vertical cooler | Square vertical cooler | Square vertical cooler | Square vertical cooler | Square vertical cooler | Square vertical cooler | Square vertical cooler | Square vertical cooler | Square vertical cooler | Square vertical cooler | Square vertical cooler | |
| Fuel | Gas, pulverized coal | Gas, pulverized coal | Gas, pulverized coal | Gas, pulverized coal | Gas, pulverized coal | Gas, pulverized coal | Gas, pulverized coal | Gas, pulverized coal | Gas, pulverized coal | Gas, pulverized coal | Gas, pulverized coal | |
| Heat rate（KJ/KgC3O） | 5300/5000 | 5300/5000 | 5300/5000 | 5300/5000 | 5225 | 5225 | 5100 | 5100 | 4810 | 4810 | 4810 | |
Lime rotary kiln working principle
Limestone is fed into the kiln through the chute at the end of the kiln. Due to the tilt and slow rotation of the kiln body, the limestone rolls along the circumference on one side and moves from the end of the kiln to the kiln head on the other side along the axis. The fuel is sprayed into the kiln from the end of the kiln through the burner for combustion, and the heat is transmitted to the limestone by radiation, convection and conduction. After the limestone is calcined into quicklime during the moving process, it is discharged from the end of the kiln, and the high-temperature flue gas enters the dust removal system from the end of the kiln.
Types of lime kiln
According to the fuel, lime kiln is divided into mixed kilns (namely burning solid fuel, coke, coke powder, coal, etc.) and Gas kiln. Gas kilns include blast furnace gas, coke oven gas, calcium carbide tail gas, producer gas, natural gas, etc.
According to the shape of kilns, there are vertical lime kilns, lime rotary kilns, sleeve kilns, Sidvemaster kilns, Merz kilns (Switzerland), Foucaz kilns (Italy), and so on.
At the same time, there are positive pressure operation kiln and negative pressure operation kilns.
Lime rotary kiln design
When designing lime rotary kiln, we should pay attention to many things, not only safety but also reasonable design. In the design of lime rotary kiln, there are mainly the following requirements:
- The design of the lime rotary kiln shall be determined comprehensively according to the production requirements of the firing system and the original and fuel conditions as well as the configuration of preheaters, precalciners, and coolers.
- The length-diameter ratio (L/D) of the preheater kiln and the precalciner kiln is suitable for 11-16.
- The slope of preheater kiln and precalciner kiln should be 3.5-4%; Speed: Pre-decomposition kiln should be 3.0-3.5r/min, preheater kiln should be 2.0-2.5r/min; the speed range is 1:10.
- Forced air cooling should be adopted for the burning zone of limestone rotary kilns.
- limestone rotary kiln firing zone should have temperature detection measures.
- The main motor of the lime rotary kiln should adopt infinitely variable speeds, and the auxiliary drive should be set up. The auxiliary drive should have a backup power source.
