Continuous Air Circulation Furnace


  • Continuous air circulation furnace is usually multi-zone controlled for better process control.
  • Individual zones can have preset temperature controls for best process results.
  • These can be heated directly electrically, or indirectly heated using electrical or gas / oil fired which are circulated through blowers to maintain accurate temperature gradient required on all the zones.
  • Numerous options such as mesh belt, pusher mechanism, flat belt or heavy link chain based conveying methods can be selected as per operational function and necessity.
  • All safety features are taken care of. Baffles or muffles are provided in direct heating.
  • Fixed with precise, dynamically balanced air circulation fans aesthetically fitted to prevent noise, vibration and achieve uniform temperature.
  • For safety, torque limiters are provided in any eventuality the conveyor stops working.
  • Limit switches, proximity sensors and other safety device are provided for safe functioning.
  • In addition annunciators are given in control system with hooters so that any errors or malfunctions are highlighted by audio and visual aids.
  • Automatic pneumatic chain tensioners are provided so that chain sagging, derailing after exposure to thermal expansions are prevented.
  • Therelek also manufactures feeding systems – bucket conveyor type or elevator based with vibratory feeders for automated loading of components.
  • Components can be directed from previous operation or loaded onto a hopper from where PLC and/or SCADA based control system transfer and handle the components until they exit from the furnace cooling zone to the unloading station or area.
  • Continuous operations that require fast cooling are provided with an additional cooling zone to bring down the temperature of components before unloading.
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Temperature Range :

upto 800°C

Standard Applications :

Curing, Annealing, Tempering, Stress Relieving, Normalizing, Decarb Annealing, Baking, Drying

Loading Options :

Mesh Belt, Conveyor Chain

Insulation :

Vacuum Formed Ceramic Fibre Boards, Ceramic Fibre Blanket, Refractory Brick Lining

Heating Elements :

Nichrome Wire / Special Alloy Resistance Heating Wire / Silicon Carbide / Molybdenum Di- Silicide / Molybdenum / Tungsten / Graphite

Instrumentation options :

Thyristor, Programmable Temperature Controller, Temperature Recorder, PLC, SCADA, HMI

Additional Features :

Muffle for Controlled Atmospheres of Nitrogen / Hydrogen / Cracked Ammonia / Argon