Aluminium Coil Annealing Furnace

SHIVANG FURNACES offers a full range of Aluminium Coil/Foil Annealing Furnaces with capacities of up to 80 MT per batch for the aluminium industry. These furnaces can be Electrically Heated or Gas Fired, and the design can be either Fixed Hearth or Bogie Hearth type to suit customer requirements.

Aluminium coils/foils placed on the charge carrier can be loaded into the fixed hearth furnace by a hydraulically or electro-mechanically driven charging machine, or can be loaded onto the bogie with the help of an EOT crane for bogie hearth furnaces.

After the annealing cycle is completed, the foils/coils are discharged from the furnace using a discharging machine (for fixed hearth furnaces) or unloaded from the bogie hearth furnace with the help of the EOT crane.

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Description

The foils/coils will be indirectly heated through radiant tube burners located behind stainless steel baffles and are provided with suitable recirculation fans for better heat transfer through convection and good temperature uniformity.

Hot air recirculation inside the furnace is done by efficient axial or centrifugal type recirculation fans, which can be equipped with a two-speed motor or with a VFD drive for low power consumption. Stainless steel baffles for proper hot air circulation inside the furnace are provided. A forced air-cooling arrangement with the help of a centrifugal fan can also be offered.

The furnace can be provided with facilities for introducing a protective atmosphere such as nitrogen gas while carrying out foils/coils annealing.

The furnaces are fired with high-efficiency (radiant tube) gas burners suitable for controlled mixing, thus providing a highly radiant flame and distributing heat release along the entire length of the radiant tube. This is supported by a full complement of the combustion system consisting of a combustion fan and gas trains. In addition, auto-ignition, flame failure safety, and complete control systems are offered. Gaseous fuel such as LPG or Natural Gas can be used.

For customers preferring electrical heating, the furnace can be equipped with electrical heating through vertically suspended heater cartridges located along the sidewalls of the furnace. The heating elements of the furnace are suitably divided into a number of heating zones, each having its own bank of heater cartridges. Each bank of heater cartridges shall be connected either in STAR/DELTA or Parallel STAR/DELTA groups to have a minimum number of heater cartridges per phase per group, allowing individual groups to be isolated and replaced without switching off the whole furnace.

The furnaces can be of Double Wall construction with inner SS 304 and outer MS, packed in between with Ceramic Fiber Lining at the side walls, roof, and door to reduce heat losses to an economic minimum. The bottom hearth of the furnace will be provided with a combination of medium-grade alumina bricks backed by insulation bricks to minimize skin temperature.

For electrically heated furnaces, the process control shall be based on heat head ratio control philosophy with thyristor heater controllers for better temperature control and energy efficiency. SHIVANG FURNACES electrically heated furnaces can be offered with 100% thyristor controllers or 30% thyristor with 70% STAR-OFF mode for better energy efficiency during heating and soaking.