The compressed buche wrote:The compressed wood can be used in all wood stoves, fireplaces (with or without insert) and in all types of open and closed fireplaces. However, compressed wood logs alter your heating habits, they contain little moisture, so they need less air to burn. Too strong draft may result in too rapid combustion. It is often advisable to control the air inlets to enjoy the high thermal efficiency of the compressed wood.
Burning will release the log of the pressure on in its manufacture. It expands slightly, it is important to position it behind the andirons to prevent it from touching the glass during combustion. The logs are easily breakable, when the fire started, breaking the first two logs improves the speed of heating.
Fire lights up the same way as for timber, simply have a fire starter and kindling, then arrange half wood pellets above the small wood. It is important not to put too logs in the fireplace, the compressed wood releases more heat than natural wood.
The calorific value indicated on the logs is the PCI or PCS. Many manufacturers talk about PC (calorific value) without specifying whether it is the PCI (lower) or PCS (upper). The latter is always higher but it does not correspond to reality, because it takes into account the latent heat of evaporation of water that is not returned in a stove or fireplace, unlike what happens in a condensing boiler.
The burning time of a compressed wood logs depends on its quality. It must be only in hardwood, dry (between 8 and 11% humidity only), preferably densified by compression, for the expansion of power for combustion. A poorly dried wood mobilizes an expensive portion of its calories to evaporate the water it contains. Therefore, the more damp the wood, the lower its calorific value. It is therefore very advisable to keep the timber well away from moisture.
Under these conditions, a good continuous fire suppose reload the home all to 2 6 hours.
More technically, the PCI is a unit of measurement to calculate the heat of combustion of a fuel material. It can result kilojoule per kilogram (kJ / kg) or kilowatts per kilogram (kW / kg).
1,7 kWh / kg to 60% humidity;
4,0 kWh / kg to 20% humidity;
4,4 kWh / kg to 11% moisture.
Wood density varies, the calorific value varies strongly.
The compressed wood energy balance is positive, unlike that of fossil fuels or electricity, which is always negative. This means that the timber can densified requires energy for its production. So 1 unit of energy consumed for production, restores 6 the granulated wood consumption; it restores 15 in wood chips.
What about this type of logs?
Moreover, it is now prohibited to burn garden waste because of fine particles, and waste disposal are under-dimensioned to receive all that excess vegetable waste (this is particularly a problem in my town). The main implementation solution is to grind the waste, which, on the one hand, reduces significantly the volume and on the other hand, produces chips used as BRF to amend the land of orchards and gardens.
We made clear brush in our neighborhood and clearing company left us several m3 chips.
Do you think it is possible to transform these chips heating logs, and how?
I read that to decompress the compressed logs for burning. I gather that the compression is primarily to facilitate the transport and storage of logs. It does not seem essential to provide a huge compression to make these logs, perhaps it would be sufficient to agglomerate the chips with a binder or a natural glue (eg. Wet flour).
A compression system can be simple with the principle of a lever that compresses a small volume of chips in a metal cylinder.
It seems you achieved?
here's a prototype :