BAT (best available technologies) for drying of plant materials

An extensive literature study is conducted to highlight the current situation and includes technology that has not yet been extensively applied in industry for drying of plant materials. A ranking based on energy efficiency, technical suitability and economy will be performed. The quality of the material after drying is a very important parameter in these comparisons.

Existing and successful energy efficient drying facilities will be visited to learn about best practices. Project team will participate in relevant exhibitions and conferences and enterprises in order to benchmark BAT.


Survey of potential waste energy sources

Different potential waste energy sources with focus on rural areas such as wood chip power plants, energy cooperatives and farms and other enterprises will be surveyed for drying. Enterprises will be evaluated for sufficient available drying energy and suitable location for drying purposes especially during summer time. Rural heating power plants will be evaluated in order to utilize power plants for drying purposes in the summer time as well which would be a new business opportunity for power plants since typically those are closed during the summer months. Bakeries will also be considered as target enterprises. Evaluation of the possible energy sources for drying can be carried out partly as purchased services.


Recommendations for drying

In order to be able to produce northern high quality dried natural products, we have to study the effects of different temperatures and different drying techniques on non-wood forest products (NWFP). Lots of information about drying temperatures of cultivated herbs and spices is available, but information about the northern natural products is missing. Birch leaves and stinging nettle shoots are used as model plants. There exists at the moment very little scientific evidence on suitable drying environments for these raw materials. Similarly the optimal vacuum drying process for these plants will be studied.


The energy efficiency of the Orakas dryer was enhanced.

Proposals in Finnish to update Orakas vegetable dryer: Orakas hyötykasvikuivurin päivitys.

Proposals in Swedish to update Orakas dryer: Växttorkaren, som blev noggrann och energisnål.


Building and testing a demo dryer and a mobile dryer for non-wood forest products (NWFP)

A demo dryer will be constructed at Öjeby Agro Park in Piteå. Planning of the demo dryer will done by LTU and Oamk.

A mobile energy efficient flatbed or a tipping bed dryer will be constructed. The trailer dryer can be filled already in the forest or on the field and during the transport it works as a pre-drying unit with unheated air.

A mobile dryer will be tested by the local NWFP producers.




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