What is a rotary kiln? A rotary kiln is an industrial equipment used in continuous processes to heat raw materials to desired high temperatures through calcination. Rotary kilns can manufacture cement, limestone, refractories, metakaolin, titanium dioxide, aluminum oxide, vermiculite, and iron ore pellets. It is widely used in building materials, metallurgy, chemical industry, and environmental protection.
Structure of a rotary kiln: A rotary kiln is mainly composed of a cylinder body, rotating device, supporting device, retaining wheel device, and sealing device of kiln head.
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How does a rotary kiln work？ A rotary kiln is a horizontal cylinder with a slight inclination to the ground that rotates around an axis. Raw materials are fed into the kiln from one end and moved downwards to another end due to the inlination. At the same time, the materials rotate slowly with the kiln body. In the process, raw materials are subjected to high temperatures and other conditions to go through a series of chemical and physical changes.
Rotary Kiln For Sale
SINOMA Zibo has more than 20 years of experience in manufacturing and supplying rotary kilns in various applications. As a piece of critical equipment in cement production, the cement rotary kiln has been a hot sale all these years. Its performance has been proven in the successful case of more than 100 cement plants. Lime rotary kilns and other types of rotary kilns are also supplied. The lime kiln is mainly used in lime calcination plants and soft burnt dolomite. Don’t hesitate to contact us for more information.
Classification of rotary kiln
The invention of the rotary kiln made the cement industry develop rapidly but also promoted research on the application of rotary kilns. Rotary kiln is widely used in many industrial fields soon, and are becoming more and more important in these productions, becoming the core equipment of the corresponding enterprise production. In the field of rotary kiln application, the number of cement industry is the largest.
According to the heating method: direct and indirect rotary kiln.
According to the shape: variable diameter rotary kiln and diameter rotary kiln,
According to the use: cement rotary kiln, ceramic sand rotary kiln, kaolin rotary kiln, lime rotary kiln,
According to the different energy supply effects: gas rotary kiln, coal-fired rotary kiln, mixed fuel rotary kiln.
According to structure: direct-flame rotary kiln and flame-proof rotary kiln
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Features of rotary kiln from SINOMA-Zibo
The kiln shell is made of rolled steel plates. Its structure is optimized by computer software and features longitudinal flexible and transverse rigid which improved the loading of supporting device and stability and stability of refractory lining.
The supporting roller bearings feature a smaller width over diameter ratio L/D. leading to its higher reliability.
The special high-started torque motor for the cement industry rotary kiln is applied for the driving system.
The sealing of the labyrinth plus spring pressing slioes, with asbestos heat isolation layers
attached is applied so that reliability and longer service life of sealing are achieved.
Specializing in the technology of oxygen-enriched combustion
Energy-saving of oxygen-enriched combustion is adopted in the cement rotary kiln system. Some of the benefits are listed below:
The most prominent one is to reduce coal consumption and save costs. The comprehensive coal saving rate can reach more than 6% regardless of the different types of coal, especially in the plateau and alpine areas.
The kiln condition will be greatly improved due to the full combustion of fuel. The phenomenon of incrustation and blockage in the kiln, decomposition furnace, and preheater will be greatly reduced.
Clinker output is increased. According to different kiln types and production capacities, clinker output per unit time can be increased by 8%-15%.
Thermal energy taken away by nitrogen is reduced resulting from the full combustion of fuel and the improved thermal efficiency. The emission of smoke and dust is reduced by 10-30%.
For every ton of coal saved, CO2 emission reduction is 2.8-3t. Energy saving, emission reduction, and comprehensive utilization are achieved at the same time, which brings double benefits to society and the economy.
Local oxygen-enriched combustion working principle
4-6% of oxygen is added based on existing air oxygen content. Theoretically, the temperature in the kiln can be increased by 30-50℃ for every 1% oxygen content increase. By doing so, the combustion temperature of the kiln head is quickly increased which makes the coal fully burn and reduces coal consumption. In this process, the raw materials are burnt in a hurry by the rotary kiln. The clinker productivity is increased, the clinker strength is improved, and the effect of energy saving and cost reduction is achieved.
Technical Features
The device adopts dzj series air-cooled atmospheric direct discharge dry vacuum pump unit, which is energy-saving and efficient. It enjoys two national invention patents.
The oxygen-enriched generator set is based on an imported Prokol oxygen-enriched membrane from Germany.
The high-efficiency air filter unit is based on the SAFH series air filter glass fiber filter imported by American HV company.
PLC automatic control system is adopted.
A cooling water circulation system is equipped.
Pipeline and automatic valve connection system.
Rotary kiln technical specification
| Size | Rotation speed(r/m) | Inclination(%) | Capacity(t/d) | Pow of motor kw | No.of support | No.of thrust roller | Type of thrust roller |
|---|---|---|---|---|---|---|---|
| ⌀3.0*48m | 0.696-3.48 | 3.5 | 700 | 100 | 3 | 1 | mechanical |
| ⌀3.2*46m | 0.602-3.01 | 3.5 | 1200 | 125 | 3 | 1 | Hydraulic |
| ⌀3.2*50m | 0.396-3.965 | 3.5 | 1200 | 190 | 3 | 1 | Hydraulic |
| ⌀3.3*52m | 0.391-3.91 | 3.5 | 1200 | 190 | 3 | 1 | Hydraulic |
| ⌀3.5*54m | 0.431-4.31 | 3.5 | 1800 | 250 | 3 | 1 | Hydraulic |
| ⌀4.0*60m | 0.35-3.5 | 3.5 | 2000 | 250 | 3 | 1 | Hydraulic |
| ⌀4.0*60m | 0.396-3.96 | 3.5 | 2500 | 345 | 3 | 1 | Hydraulic |
| ⌀4.3*64m | 0.396-3.96 | 3.5 | 3000 | 420 | 3 | 1 | Hydraulic |
| ⌀4.3*66m | 0.396-3.96 | 3.5 | 3500 | 420 | 3 | 1 | Hydraulic |
| ⌀4.3*60m | 0.403-4.03 | 3.5 | 3000 | 400 | 3 | 1 | Hydraulic |
| ⌀4.6*68m | 0.398-3.98 | 3.5 | 4000 | 560 | 3 | 1 | Hydraulic |
| ⌀4.7*75m | 0.396-3.96 | 3.5 | 4000 | 500 | 3 | 1 | Hydraulic |
| ⌀4.8*72m | 0.396-3.96 | 3.5 | 5000 | 630 | 3 | 1 | Hydraulic |
| ⌀4.8*74m | 0.396-3.96 | 3.5 | 5000 | 710 | 3 | 1 | Hydraulic |
| ⌀5.0*72m | 0.4-4 | 3.5 | 5500 | 710 | 3 | 1 | Hydraulic |
| ⌀5.2*76m | 0.45-4.5 | 3.5 | 6000 | 2´530 | 3 | 1 | Hydraulic |
| ⌀6.0*96m | 0.4-1 | 3.5 | 10000 | 2´950 | 3 | 1 | Hydraulic |