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Indirect Fired Rotary Kiln

Capacity: 100-5000t/d

Fuel: gas, electricity, oil, etc.

Applications: Widely used in chemical, new materials, metallurgy, precious metals, rare earth, new energy, and other industries.

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Indirect fired rotary kiln refers to rotary kiln with the indirect heating method, also known as indirect heated rotary kiln, or external heating rotary kiln. The indirect fired rotary kiln can use natural gas, liquefied gas, coke oven gas, producer gas, diesel and electricity to heat, and can also be equipped with oil and gas dual-use systems.

As the name suggested, the indirect-fired rotary kiln is equipped with a combustion chamber outside the kiln body, and the flue gas heat generated by combustion is transferred to the material through the kiln body, the material is calcined at high temperature, the calcined product is discharged from the discharge valve, and the waste gas is discharged or utilized after treatment.

Conversely, we all know there is direct fired rotary kiln, it is the direct contact between the fuel and the material, and the roasting is carried out in the kiln, and the heat energy is directly transferred.

We supply indirect fired rotary kilns with different fuel options, such as electric, oil, gas, etc. As a leading rotary kiln manufacturer, we can offer EPC projects for every client, covering rotary kiln design, rotary kiln manufacture, rotary kiln installation, spare parts supply, rotary kiln maintenance, and other custom services according to your real needs.

fuel option

Indirect-fired rotary kiln can use a variety of fuels, and can also be equipped with fuel, gas dual-use system.

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custom design

We have more than 160 highly sophisticated technical personnel to support customized design of rotary kilns.

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spare parts supply

As a professional rotary kiln manufacturer, we supply related spare parts of rotary kiln.

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Indirect fired rotary kiln uses

Our indirect-fired rotary kiln is mainly applied for metallic and non-metal minerals, it can also be used for the combustion, decomposition, and drying of agricultural products, chemical products, medical and other materials. The materials treated by direct-fired rotary kiln are highly toxic substances or materials that require high concentrations of flue gas and high product purity.

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Indirect-fired rotary kiln design

Indirect-fired rotary kil is mainly composed of six parts: combustion system, control system, cylinder body, kiln body, driving device, feeding and unloading system. All the rotary kiln components are mounted on an integral frame made of steel structure.

indirect fires rotary kiln
electric heating rotary kiln
  • The rotary kiln burner is mainly composed of burner, proportional control valve, solenoid valve, electric actuator, atomizing combustion aid device, ignition device, etc.
  • The cylinder has a sprocket or girth gear, both ends are supported by kiln support rollers, and is driven by an FM motor through the sprocket or gear. Cylinder material can be selected according to the process requirements of different materials.
  • The kiln body is located on a steel frame and is mainly made of lightweight insulation materials. The use of high-quality folding blocks, containing zirconium ceramic cotton blanket, reduce heat storage. The labyrinth seal is composed of refractory material and fire retaining ring of cylinder body.
  • The drive device can be driven by chain drive and gear drive, the reducer has two shafts, and the manual device can be added to protect it from being damaged by shaking the cylinder in an emergency.
  • Feeding and unloading system, mainly composed of feeding hopper, feeding screw, stirring device, feeding cover, etc.
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Adjusted Calcination time and process

It is suitable for continuous production on a large scale. The heat source is controlled by imported SSR thyristor or power regulator, and the temperature control accuracy is high. At the same time, the working temperature can be adjusted according to the actual production process, and the calcination time can be adjusted in various ways, which is flexible and stable.

Fewer wearing parts facilitate maintenance

The heating chamber adopts the upper and lower two-stage assembly design, which is convenient for disassembly during maintenance. The high-quality heating components have a long service life. They are arranged in parallel, side-mounted, and drawer types. The replacement is very easy, and there are few failure points. Careful efforts are made for humanized design.

Automatic control, less labor-intensive

Feeding bin control + feeding instantaneous speed control to ensure continuous operation; multi-temperature and multi-pressure point monitoring. The whole system can realize automatic control; blast, induced air, protective gas opening and pressure control; data is recorded without paper, and the driving team can be easily handed over.

The system is closed, no pollution

The material flow is always in the inner furnace body, indirect heat transfer, the system is closed, there is no environmental pollution, and it also avoids the pollution of the material by heating, with high recovery rate and less impurities.

specifications of indirect fired rotary kiln

ModelDiameter(cm)Length of heating section(mm) Capacity(t/h)Tempaerature (℃)Power(kw)Weight(t)
Φ0.8×8m80060000.5-1.0400-12005.58
Φ1.0×10m100080000.8-1.27.59.5
Φ1.2×12m1200100001.2-1.61114.5
Φ1.2×15m1200130001.5-1.91515.5
Φ1.5×14m1500120002.0-2.71527
Φ1.5×16m1500140002.8-3.018.527.5
Φ1.8×20m1800160003.2-3.62238
Φ2×12m2000100003.0-3.518.545
Φ2×15m2000130003.2-3.82250
Φ2.2×16m2200140003.5-4.23062
Φ2.2×18m2200160003.5-4.53065

working principle of indirect fired rotary kiln

The direct-fired rotary kiln consists of a flat-lying slightly inclined cylinder body and a furnace body fixed at both ends of the kiln body. The rotary kiln parts include a kiln shell, kiln tyre ring, girth gear and pinion, driving device, refractory brick, supporting roller, kiln thrust roller, inlet and outlet kiln sealing.

The material to be burned is uniformly fed into the indirect fired kiln from the kiln head hopper through the feeding system. Driven by the transmission device, the material moves forward along the shaft of the barrel with the rotation of the barrel, and the material is turned over by the sheet to make it calcined evenly. The outer side of the rotary kiln cylinder is provided with a burning chamber. The heat generated by calcination is transferred to the material through the cylinder, and the material is incinerated, decomposed, dried, calcined and roasted at high temperatures. The discharge valve of the calcined discharge system is discharged and discharged or recycled after treatment.

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