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23 Jul. 1984

Wood burning gasifier plans,cabinet making jobs geelong,wood queen bed frame plans free - PDF Review

Wood gasification is a thermo-chemic way to extract flammable gases from wood, leaving nothing but a few small char particles -known as bio-char- and some condensate.
Unfortunately, the ready wood gas is substantially diluted with useless nitrogen (N2) which came in with the incoming air.
Soft woods, like coppice willow, are fast and easy to grow and will gasify excellently in a well-dimensioned gasifier.
Wood is virtually free, because trees can thrive on land that is not suitable to grow crops.
If the car wood is made and transported by petroleum-fueled machines, the fossil CO2 output is only about 10 grams per driven kilometer.
One can harvest 1,000 km worth of car wood –that is about 1 m3 of loosely filled wood blocks - in 8 hours.
A woodgas-powered car will not allow you to get somewhere fast, but it will allow you to get there.
Since a few years back, commercial manufacturers of small gasification systems has become active in many countries, including the US. I knew they did this back during WWII, but did not know of actual practioners of the black art of wood-gassified cars. I also wonder about the competitiveness of burning wood for a steam engine instead - or additionally using waste heat from a wood-gassified car to cogenerate steam for additional power.
In the Scandinavian countries, woodgasification always got more interest, just because the availability of so much wood.
If I could use these wood chips in a co-gen set-up like you described, not only could I make electricity, but the bio-char "waste" is an awesome soil amendment if used properly. The gasifier and engine are connected, so the draw of the engine determines how much gas is being produced.
Although oil has potential to bring more energy, it adds to the tars that distillate out of the wood. But the most pleasant advantage of wood as an engine fuel is the fact that it is accessible to almost everyone. Bulky gasifier systems feed an electric power generator while most of the heat is recaptured and used to dry the wood and heat buildings.
If you make the wood fuel all by hand and don’t eat much meat, the fossil CO2 output is minus 10 grams per kilometer.

While the basic wood block fuel can produce excellent numbers, we still have to take the refinery into account. The gasifier, wood and operator all have to work in a successful trinity, otherwise it will not work. When you want to build a wood gasification system yourself, a couple of hundred hours studying cannot be avoided. I am always looking for ways to exploit my local waste streams, and one of the "wastes" readily available to me is wood chips from the local tree-service companies. Since wood is the most accessible, free and ever-regenerating storage medium of solar energy, it would be a shame not to use it. As I mentioned earlier, these tars have to be cracked into smaller hydrocarbons in the hot part of the gasifier. It is possible to refine wood gas to a liquid using the so-called Fischer-Tropsch process, but not on a small personal scale.
A well-designed gasifier in combination with an experienced operator will minimize this danger. Gasification (as well as simply building a gasifier) is a combination of thermodynamics, math, material knowledge and manual crafts. They are an excellent choice if you want a gasifier and have more money than manual skills. This article will not deal with the direct burning of wood, nor with gasifiers meant for heating purposes. This is done by burning about 15% of the wood by means of injecting a restricted flow of air, but at high velocity. It’s a tricky process, taking place in a very short time, and is therefore sometimes not completely done. Stationary systems are often much bigger compared to vehicle gasifiers, less compromised and therefore more reliable, easier-to-control, and produce cleaner gas. We cannot make cars from wood; they still need inputs of fossil energy and other commodities. Wood gas cannot be stored by compressing it, since carbon monoxide is an unstable gas and will fall apart under pressure. They have designed the Power Pallet which produces 10kWe, sort of the wood powered off-gridder.

Instead, we’ll talk about wood gas generators connected to internal combustion engines and vehicle engines in particular. Of course, first the gasifier has to be fired up with the help of a fan, creating and artificial draw.
Between the restriction plate (fat black drawn) and the grate, the actual reduction to carbon monoxide and hydrogen takes place. On the scale of personal transportation, a wood-powered car is somewhere in the middle if the scale has a petroleum fueled car on one end and a horse on the other. Besides that, it cannot be scaled up to present mileages, simply because there is not enough wood. A sharp brain, patience and perseverance are needed regardless Buying a gasifier and immediately storing it for crisis times is not the way to go. I have been following them for quite sometime and even visited for a bit (search "monk welds gasifier"). By burning it with oxygen (O), the end products are carbon dioxide (CO2) and water vapor (H2O), both superheated to the previously-mentioned high temperatures. Tarry gas is the worst enemy of a woodgasser (guys who drive on wood) and the most difficult one to fight. A wood-powered car is slightly more sustainable than a biodiesel-fueled car, because preparing the basic fuel (wood blocks versus vegetable oil) asks for less - or even no - fossil input.
Once ready, the black art starts… Yet, a very simple gasifier can be made in only one day.
During this oxidizing stage, the remaining wood becomes char and the escaping tars are cracked by the heat into much smaller hydrocarbons. After all, wood is bundled solar energy, allowing for a continuous power supply (which cannot be said of PV panels or wind turbines).
It is exciting and stimulating to obtain a perfect purple flame from a black box filled with chopped wood. Should the wood only be used for electric power generation and the heat being wasted, then I consider it again as a crisis fuel.

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