Preliminary dryer for the carbonization furnaces EKKO

Pre-drying (PD) is a device for automatic preparation of a heat carrier – a drying agent for use in drying devices. The basis of the coolant is the excess heat released during the pyrolysis process

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Preliminary dryer is used to “quickly and efficiently” remove moisture from wood to obtain dry raw materials for pyrolysis. Preliminary drying takes place outside of the drying/pyrolysis chamber, which can significantly shorten the cycle time and increase the productivity of the kiln from 50 to 100% when using “fresh” wood.

Preliminary drying of raw materials can be carried out either in trolleys for EKKO, or in a separate chamber of continuous or periodic operation for Bio-kiln. The use of a chamber or a drying drum for preliminary drying significantly increases the efficiency of the process, due to the special design of the chamber, which provides minimal heat loss and the most effective contact of the heat carrier with the raw material.

Preliminary drying of raw materials not only reduces the duration of the process, but also affects the quality and yield of charcoal. It is recommended to apply preliminary drying, if the moisture content of raw material exceeds 30%.

Main advantages 

  • Increase kiln productivity
  • Increase % charcoal yield
  • Effective drying of “raw materials”
  • Compactness
  • Easy operation
  • Low cost
  • Security

From the table below, you can clearly see the difference in the cycle time at different humidity of the raw material for the production of charcoal.

Relative humidity of wood, %Cycle time, h.
< 20> 12
< 40> 16
< 55> 24
< 70> 36


 Item NameNoteQuant., pcs
1High-temperature smoke exhausterT < 400ºC1
2Thermocouple THATT< 800ºC1
3Thermal mixerTo dilute coolant with cold air < 200ºC, optimal drying of wood1
4Distribute heatTo distribute heat to two trolleys 1

Technical description

Excess heat generated as a result of carbonization of plant material enters the flue, using a high-temperature smoke exhauster (1). The hot gas is fed to the mixer (3), where its temperature is lowered to that required by mixing with cold air. The prepared heat transfer medium is then supplied through the distribution manifold (4) to the drying device (5), in this instance a EKKO trolleys.

PRELIMINARY DRYING in trolleys of the carbonization furnace “EKKO”

Options for devices for preliminary drying of raw materials

  1. Chamber drying (batch type)
  2. Continuous Tunnel Drying
  3. Continuous shaft drying
  4. Continuous Drum Drying
  5. Trolleys of carbonization furnace  EKKO 

When using the preliminary dryer, it is recommended to increase the number of trolleys for one carbonization furnace double. For example, if for carbonization furnace EKKO-2 must to be min. 4 trolleys, with preliminary drying system must to be min. 8 pcs. It is also recommended to “close” the trolley from the cold weather and hard wind, can used drying chamber with good heat isolation.

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Preliminary dryer for the carbonization furnaces EKKO
Preliminary dryer for the carbonization furnaces EKKO

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