A new type of renewable energy source derived from forestry

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43410%2F21%3A43920833" target="_blank" >RIV/62156489:43410/21:43920833 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

A new type of renewable energy source derived from forestry

Original language description

A dendromass in the form of firewood obtained from forest harvesting or optionally forest harvesting residues that remain in a forest after the harvest such as branches, roots or stumps can be derived from forestry operations and used for energy purposes. Stumps and roots are considered as a material of non-standard size. Their transportation is difficult, and they consist of mineral contents (stones and soil). The grubbing head is one of the tools that could be used in the stump removing process and functions as an adapter to the boom of an excavator. Therefore, the Faculty of Forestry and Wood Technology at Mendel University in Brno developed a new grubbing head prototype for obtaining a new type of biomass from forest sites. This new prototype enables harvesting stumps in a manner that distorts the layer of the organic soil only to a minimal extent. After a stump or its parts are removed from the subsoil, the grubbing head allows for stump extraction to occur until the point where the soil is separated from the removed stump. The soil falls into the space left by the removed stump. With the help of the bottom part of the grubbing head, the surface is then modified, aligned, compacted and set for subsequent forest regeneration and establishment activities. Stump parts are stored in piles with the assistance of the hydraulic boom of an excavator. Those relatively clean parts of stumps are then exported from the site. When the humidity reaches 30 %, stumps are converted into woodchip with the help of a wood crusher. The woodchip is then transported to an incinerator or a power station with the use of various means of transport. This woodchip has optimal calorific value and represents a source of renewable energy derived from forestry. After assessing the data of all real values obtained from multiple field measurements, it was concluded that the average time of the processing of one stump, including the modification of the subsoil after the removal and the transition of the excavator to another stump, is three minutes. An experienced operator is therefore capable of processing approximately up to 20 stumps on a site per hour. The new grubbing head prototype will bring new economic opportunities to extensive mass harvesting in all forests. Furthermore, the regions that will use the new grubbing head prototype might see an increase in employment.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

40102 - Forestry

Project

<a href="/en/project/FV40031" target="_blank" >FV40031: The multi-purpose modular system for excavation of stumps and other commodities.</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů