The GREBE project arranged another possibility for the transfer of knowledge within the Northern Periphery area by hosting expert’s sessions with SME´s. The sessions were part of the GREBE project partner meeting from 20th to 22nd of March in Kokkola, Finland. Both the project partner meeting and knowledge exchange expert meetings took place in Kokkola during the event hosted by the Finnish GREBE partners LUKE and Karelia UAS.
Three SME´s came from Ireland to Finland to meet with experts and share knowledge relevant for their business. Two experts, Paula Jylhä and Veikko Möttönen from the GREBE partner organization Natural Resources Institute Finland (LUKE) were available to the participants for one-to-one meetings. In addition, Ville Kuittinen from Karelia University of Applied Sciences (Karelia UAS) shared his knowledge and ongoing activities in the renewable energy field.
Paula Jylhä, whose expertise is in forest technology and logistics, provided information to the Irish stakeholders on the topic. Paula is also coordinator of the project FOBIA and presented the project to all GREBE partners and SME´s. FOBIA is funded also under the Northern Periphery and Arctic programme. Veikko Möttönen, who has his area of expertise in wood mechanical properties and further processing of sawn wood, was able to provide information on practices to handle side streams and plans of companies for the production development.
This activity was part of the GREBE project´s “Knowledge & Technology Transfer and Business Delivery” work package led by LUKE. The aim of the expert sessions were to facilitate transnational effective knowledge transfer and collaboration in the renewable energy business sector, and to promote knowledge sharing and information exchange between actors in renewable energy supply and demand.
In the autumn of 2015, a 10 MW grate boiler plant and a modern flue gas scrubber with a heat pump connection were commissioned at Kauhavan Kaukolämpö Oy’s Kauhava plant. The concept of the plant and operations is based on the burning of fresh woodchips – from harvesting timber through the logistical chain to burning and heat recovery. Based on the operational experience of the past winter, the concept of using fresh woodchips is working very efficiently, providing significant cost savings in the acquisition of fuel to the plant operator. Despite high moisture, the burning of woodchips can be controlled and specific emissions are low.
As a concept, the burning of fresh woodchips is new and rather heretical. The traditional way to burn woodchips is to store the felled timber on roadsides and allow them to dry before chipping and burning. Practical issues of logistics have also contributed to this model. It can be assumed that the concept of fresh woodchips works efficiently in part because a significant portion of the volatile components contained in timber is included in combustion, rather than allowed to evaporate into air.
The use of fresh woodchips requires a completely new kind of thinking from the plant and logistics. The concept can also be applied to old plants if the structure of the boiler is suitable for burning moist fuel. Fresh fuel also sets some requirements for the fuel storage and fuel supply systems.
An essential part of the system is, however, a flue gas scrubber system that efficiently recovers heat from flue gases, condensing the moisture of the fuel vaporised in the boiler. The scrubber should work reliably and efficiently under all conditions, regardless of the variation in the return temperature of district heating. With a heat pump integrated in the scrubber, flue gases can be cooled efficiently to even below +30°C, making it possible to utilise a significant part of the condensation heat of the water contained in the flue gas. For the purpose of optimising and ensuring the profitability of heat production, a heat pump scrubber has, in practice, been established as the only potential recovery technology for lost heat.
Summarized from article by Mika Nummila: http://www.elomatic.com/en/elomatic/expert-articles/voc-emissions-of-timber-felled-for-fuel-%E2%80%93-a-significant-energy-loss.html