Indirect Rotary Kiln

An indirect rotary kiln, also called a calciner, heats material without ever touching it with a flame. The rotating drum is sealed inside an externally heated shell, so heat flows through the drum wall into the material while the inside stays isolated from combustion gases. That separation is what makes the indirect kiln the only choice for processes that demand a clean, controlled or oxygen-free atmosphere.

How Indirect Heating Works

The kiln shell is heated externally, by burners or electrical elements arranged around it, and the material inside is warmed by conduction through the drum. Because no combustion gas passes through the drum, the atmosphere inside can be kept inert, essential for pyrolysis, where material must decompose without burning, and for thermal desorption, where recovered vapours must stay uncontaminated.

Where the Indirect Kiln Wins

Indirect kilns suit pyrolysis and calcination of materials that are sensitive to air, finely divided, or that release high-value or flammable vapours. Beyond atmosphere control, they also shrink the necessary gas-handling equipment and make it easier to adjust temperature in zones along the drum, giving precise control that a direct-fired kiln cannot offer.

Learn More:

• Tyre Pyrolysis Plant
• Klean Repairs Faulty Rotary Kiln Systems
• Feasibility Studies
• Turn-Key Project Delivery

Process in an Atmosphere You Control

Klean Industries engineers indirect rotary kilns and calciners for pyrolysis and thermal processing where the atmosphere is as important as the temperature.

Klean Industries has repaired and recommissioned faulty third-party rotary-kiln pyrolysis plants and delivered three recovered carbon black plants in India over the past two years.

Need an inert-atmosphere kiln?

Contact Klean Industries about indirect rotary kilns » GO.