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Contact Drying (CD) for charcoal kilns of EURO and EKKO type

Pre-drying is used to remove moisture from wood quickly and efficiently in drying devices, to produce dry raw materials for pyrolysis. Pre-drying takes place outside the drying / pyrolysis chamber, which can significantly reduce the cycle time and increase the kiln productivity from 50 to 100%, using fresh wood.
Preliminary drying of raw materials can be carried out either in trolleys for EKKO or EURO furnaces, or in a separate chamber of continuous or periodic operation for Bio-kilns. 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.

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 for GreenPower EURO and EKKO kilns

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%.

You can familiarize yourself with the types of wood dryers in this article: Types and methods of drying wood

From the table below, you can clearly see the difference in the duration of the cycle at different humidity of raw materials for charcoal:

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


Preliminary Dryer delivery set

Item Name Note Quant., pcs
1 High-temperature smoke exhauster T < 400ºC 1
2 Thermocouple THA T < 800ºC 1
3 Thermal mixer To dilute coolant with cold air <200ºC, optimal drying of wood 1
4 Distribute heat To distribute heat to two trolleys 1
  • When using CD, it is recommended to increase the number of trolleys for one furnace to 8 pcs.
  •  It is also recommended to "close" the trolley from the weather.


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 kiln trolley.


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