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 heat carrier is the excess heat released during the pyrolysis process
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%.
