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Batch homogenizing for round logs

Many major aluminum producers combine continuous and batch homogenizing systems for ultimate flexibility.
Even when they replace obsolete batch homogenizing equipment with continuous homogenizers, most customers retain some of their existing batch plants to process certain special alloys.

Operating labor for a combined plant is typically limited to:

  • Data storage on log entry
  • Quality control at visual/UT inspection station
  • Billet saw
    Available here are furnaces for round logs, rolling slabs, and combination furnaces (slabs & logs).
  • Single-chamber furnace up to 60 t
  • Double-chamber furnace up to 120 t
    These plants achieve top homogenizing quality with accurate temperature control (+/-3°) and reversing air flow for near-uniform heating and cooling.
Picture - Typical plant layout (Batch&Conti) Picture - Typical plant layout (Batch&Conti) Picture - Typical plant layout (Batch&Conti) Picture - Typical plant layout (Batch&Conti)
Typical plant layout (Batch&Conti)
Picture - 2x Stack - Storage - 2x - Homogenizer - 1x Cooler Picture - 2x Stack - Storage - 2x - Homogenizer - 1x Cooler Picture - 2x Stack - Storage - 2x - Homogenizer - 1x Cooler Picture - 2x Stack - Storage - 2x - Homogenizer - 1x Cooler
2x Stack - Storage - 2x - Homogenizer - 1x Cooler

Furnace design

Conventional batch homogenizing furnaces apply the principle of mono-directional airflow, as shown by the illustration. Our new generation of furnaces with reversing air heats the logs about 20 percent faster. You benefit from the fact that the reversing air flow drastically reduces temperature deviation between the outer and inner logs. Vital to the process is an intensive airflow and perfect heat distribution to achieve near-uniform log temperature throughout the stack. Typically, reversing-air batch homogenizing furnaces come with reversing-type ventilators. However, this is not particularly efficient, because every change in flow direction costs time and puts mechanical strain on units such as motors and fan wheels. Bidirectional fan wheels are less efficient and reach only around 70 percent of the nominal airflow in one direction. The solution? Our high-efficiency furnaces and cooling stations. They feature flaps that switch the airflow direction within 3 to 5 seconds without extra strain on motors and fan wheels. That makes heating 15 to 20 percent faster.

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Monodirectional airflow furnace
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HE flap type reversing air furnace