DE102011055105A1 - Method for manufacturing dried wood e.g. firewood, involves wrapping dried wood with moisture-impervious packaging film, after performing drying process of moistened wood in drying and dehumidifying device - Google Patents

Abstract

The method involves drying the moistened wood (H) in a drying and dehumidifying device (21). The dried wood is wrapped and packed with a moisture-impervious packaging film (F) so as to avoid the penetration of moisture into the dried wood, after performing the drying process of the moistened wood. The moisture-impervious packaging film is made of polypropylene material or polyethylene material. The packed dried wood is transported and stored. An independent claim is included for a dried wood.

Description

The invention relates to a method for the production of dried wood with the step of drying the wet wood in a drying and / or dehumidifying device, and dried wood, especially firewood.

Firewood can be understood in this context in particular as firewood, firewood, firewood, firewood, wood chips and / or wood shavings being to be understood here in particular.

From the prior art different arrangements are known to dry wood.

The goal of controlled wood drying is to achieve a certain moisture content of the wood. This moisture of the dried wood is usually between 10% and 20% wood moisture, in each case based on the weight of dry-dried wood.

In the drying of wood for combustion for power generation, namely wood burning drying is a rapid removal of water in the foreground to improve combustion characteristics and heating performance of the fuel.

The wood drying takes place during or after the wood processing either primarily in firewood by outdoor drying or by technical drying by means of thermal processes, such as evaporation or evaporation in dryers, especially refrigeration dryers. Further processes for the rapid drying of very permeable and therefore easy-to-dry woods are high-temperature drying and high-frequency drying.

In firewood drying, the cost-effective and energy-efficient removal of moisture from the fuel is in the foreground. In particular, the calorific value of firewood increases linearly with the decreasing moisture content. By contrast, drying damage in firewood production plays no role. For cost reasons, and to preserve the environmental advantage of the fuel based on natural renewable resources wood, the energy gain achieved by the drying in firewood use must be significantly higher than the energy required for drying.

In the open air drying of firewood, the energy consumption is minimal. In convective drying, on the other hand, the financial outlay and the energy use can be optimized by using otherwise unusable waste heat for wood drying. If waste heat is used by the combined heat and power for wood drying, the overall energy balance can be increased.

In addition to the drying process of the chamber drying, there are other methods of convection drying for firewood such. As the drum drying and the contact drying, wherein z. B. for drying wood chips a screw dryer is used.

Exemplary this will be on the EP 0 744 012 B1 in which a method and an arrangement for drying wood are disclosed.

Next is exemplified as prior art in terms of wood drying the US 3,468,036 from which a already known from the 1960s drying method and an arrangement is known.

Furthermore, processes for drying wood are known in which the humidity is condensed out with the aid of refrigeration dryers.

The lack of verifiability of the energy content is problematic, especially in the area of energy supply, in particular the supply of solid fuels from wood. Often, firewood is sold in room meters or in bulk meters, equivalent to about 0.5 cubic meters. Here, there is the problem that an accurate determination of the amount of energy contained in a room meter is not possible, since a room meter only about 0.7 solid meters or only 1.4 to 1.65 bulk space meters are, so here there are fluctuations in the amount comes from wood as well as contained energy. These approximate figures are not sufficient to determine an actual amount of energy contained in firewood or to trade firewood.

In addition, dried wood is hygroscopic, which causes the dried wood to absorb moisture from the surrounding air, which in turn lowers its energy content. On the one hand, therefore, the amount of energy can not be determined exactly by a volume and, on the other hand, there is a deterioration in the amount of energy of the dried wood during storage, delivery and further storage.

The present invention has for its object to provide a method for producing dried wood, which makes it possible to keep the energy content of wood after drying constant until the wood is burned at a consumer, for example. In addition, the method should make it possible to keep dried wood for a long time under the same conditions, in particular, its degree of drying is maintained.

In particular, dried wood in the form of amounts of energy (kWh or equivalent) to be traded.

Another object is to provide a correspondingly processed dried wood, which has a determinable energy burning value, which is unchanged until use.

This object is achieved with an arrangement according to claim 1.

The fact that after drying the wood with and / or encased in a moisture-impermeable packaging and / or packaged so that moisture can no longer penetrate into the wood and the wood can be transported and / or stored, the energy content of the wood remains constant until actual use. In particular, in this way when selling the wood, a calorific value or a contained amount of energy can be specified, which is constant until actual use.

Another particular advantage is given when the packaging of the dried wood even at, compared to the normal to the ambient temperature adjusted wood temperature, elevated temperature, namely still warm wood, takes place, since so the largest amount of energy is retained after drying.

If the wrapping and packaging of the dried wood is done by wrapping and / or packing in a moisture-impermeable film, so a cost-effective packaging of the wood is possible.

Characterized in that the wrapping and packaging of the dried wood after drying takes place after drying or in such a short time window after drying, so that the dried wood can not absorb moisture, the amount of energy remains substantially after drying.

In particular, before the wood is dried, the wood is processed by crushing, splitting, sawing, chopping and / or cutting or the like, so that the wood to be sold is already in kiln or kiln-sized sizes or in correspondingly desired sizes and / or or treatments.

The dried wood, especially firewood or wood is completely enclosed with a moisture-impermeable packaging, so that the firewood or wood can not absorb moisture from the environment.

During the burning of the dried wood thus present higher temperatures are achieved in particular when burning in an oven, resulting in that pollutants significantly reduced in the exhaust stream and the deposition of soot in the furnace and the associated pipe / chimney system are significantly reduced.

Due to the fact that the moisture-impermeable packaging is a moisture-impermeable, in particular thin film, particularly preferably one or more materials, such as PVC, PP, PE and / or the like, a cost-effective variant of packaging is possible.

The fact that the fire / firewood thus produced can not absorb moisture, infestation with fungi, spores and vermin is completely excluded, so that total of the dried and in a moisture-impermeable packaging wood pose no health hazards during storage and transport can.

Hereinafter, a principal embodiments of the invention will be described with reference to the accompanying drawings.

It shows:

1 a schematic diagram of an embodiment of the inventive method for drying wood.

In 1 is a schematic diagram of an embodiment of the inventive method for drying wood shown.

The wood H is initially in a preferred embodiment in a woodworking 1 processed. This woodworking 1 includes, for example, sawing, cutting, splitting, crushing and / or hooking the wood H.

Subsequently, the wood H in the working direction X in the drying and sealing 2 directed. In the drying and sealing 2 takes place first in a drying and dehumidifying device 21 the dehumidification of the wood H to dried wood H. After the wood H has dried to a moisture content of about 10 to 20%, takes place in a sealing and packaging device 22 packaging in a moisture-impermeable packaging, especially a film F. However, a stronger drying of the wood is possible and useful, with degrees of drying up to 0.1% can be achieved.

After the dried wood H 'has been packed in a film F, the wood can be stored temporarily, assembled in larger batches, transported and / or sold, the residual moisture of the wood no longer changing, although the wood is still hygrostatic, but from the environment is shielded by the moisture-impermeable packaging, in particular the film F.

LIST OF REFERENCE NUMBERS

1

woodwork

2

Drying and sealing

21

Drying and dehumidifying device

22

Sealing and packaging device

F

moisture-proof packaging / foil

H

Wood

H'

dried wood

X

working direction

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 0744012 B1 [0010]
• US 3468036 [0011]

Claims (7)

Method for the production of dried wood (H ') with the following step: - drying of the moist wood (H) in a drying and / or dehumidifying device ( 21 ), characterized in that after drying the wood (H ') with and / or wrapped in a moisture-impermeable packaging (F) and / or packaged ( 22 ), so that no more moisture in the wood (H ') can penetrate and the wood (H') can be further transported and / or stored. Process for the production of dried wood (H ') according to claim 1, characterized in that the packaging of the dried wood (H') still at elevated compared to the normal temperature adjusted to the ambient temperature wood temperature, namely still warm wood (H '), he follows. Process for the production of dried wood (H ') according to claim 1 or 2, characterized in that the wrapping and packaging of the dried wood (H') takes place by wrapping and / or packing in a moisture-impermeable film (F). Process for producing dried wood (H ') according to claim 1, 2 or 3, characterized in that the wrapping and packaging of the dried wood (H') after drying following drying or in such a short time window after drying takes place so that the dried wood (H ') can not absorb moisture. Process for the production of dried wood (H ') according to one of claims 1 to 4, characterized in that prior to drying the wood a processing of the wood (H) by crushing, splitting, sawing, chopping and / or cutting ( 1 ) he follows. Dried wood (H '), in particular firewood and in particular produced by a method according to one of the preceding claims, characterized in that the dried wood (H') is completely enclosed by a moisture-impermeable packaging (F). Dried wood (H ') according to claim 6, characterized in that the moisture-impermeable packaging (F) is a moisture-impermeable, in particular thin film (F), particularly preferably one or more materials, such as PP, PE and / or the like.

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