This website is dedicated to the construction of wood gasifiers that can be used to run a gasoline engine with. Woodgas has been around for a long time and it. and FEMA EMWE We’rk Unit D. APPROVED FOR . implified version of the World War II, Imbert wood gas generator. This simple, stratified. If you google “fema gasifier” there will be several documents that should pop up. Below is an example.

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The FEMA design is generally suited to hasification wood gasification and many variations of this design do power vehicles without destroying them. A prototype gasifier unit was fabricated from these instructions.

A proven design concept that works very well and is stable if it’s set up correctly. I have always wanted to have a neighbor just like you – Fred Rogers. The nitrogen is not combustible; however, it does occupy volume and dilutes the wood gas as it enters and burns in an engine. Personally, I believe that a FEMA system could be optimized for a very particular fuel and, if run at a more or less constant output, then I believe it could make a reliable and useful unit.

No special fuel shape or pretreatment is necessary; any blocky fuel can be used.

The reader is urged to use his ingenuity and initiative in constructing his own wood gas generator. The purpose of a gasifier, then, is to transform solid fuels into gaseous ones and to keep the gas free of harmful constituents.

However, other fuels such as shredded wood, sawdust, and bark can form a bridge that will prevent continuous flow and cause very high temperatures. If you google “fema gasifier” femma will be several documents that should pop up.

FEMA Gasifier

You can use this to generate biochar as an added benefit. Photographic documentation of the actual assembly of the unit, as well as its operational field test, is included in this report. The first question many people ask about gasifiers is, ‘Where does the combustible gas come from?


The build is a bit more involved and technical.

Imbert gasifier vs FEMA gasifier

With good charcoal one can generate a clean fuel fwma with a steel can and a couple of tubing connections see Gary Gilmore’s work. However, all enthusiasts I know of who use gasification on a regular basis and who started with a FEMA unit have moved on.

Wayne Keith worked pretty well with a modified FEMA design not that I can attest to any working experience as my knowledge is fea literature. Section 1 describes gasification principles and wood gas generators, in general, and gives some historical background about their operation and effectiveness.

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A closure is only used to preserve the fuel when the engine is stopped. All of these solid fuels are composed primarily of carbon with varying amounts of hydrogen, oxygen, and impurities, such as sulphur, ash, and moisture.

Below is an example: Restricting air supply to a region just above the hearth as opposed to drawing air through the firetube is important as is helps reduce thermal losses that would otherwise be encouraged with combustion taking place over the larger firetube area, and the combustion reaction is isolated at or just below the nozzles which is important for supporting a wide turndown ratio and a variable fuel quality.

The cylindrical shape is easy to fabricate and permits continuous flow of fuel.

FEMA wood gasifier demonstration and DIY specifications (biogas forum at permies)

Until the early ‘s, wood gasifiers all over the world including the World War II designs operated on the principle that both the fuel hopper and the combustion unit be airtight; the hopper was sealed with a top or lid that bad to be opened every time wood was added.

I don’t want the thread to turn “heated” to discourage people in anyway The filtering must be good enough to capture the tar to protect the engine from being gummed up. Bridging can be prevented by stirring, shaking, or by agitating the grate or by having it agitated by the vehicle’s movement. Personally, I find the videos rather interesting and chose not to marginalize the author’s efforts. Naturally, the people most affected by oil and petroleum scarcity made the greatest advancements in wood gas generator technology.


Very little to no tar mess to be disposed of or dealt with. The tar can be used to tar your roof or your driveway. In fact, the use of wood gas as a fuel is not even restricted to gasoline engines; if a small amount of diesel fuel is used for ignition, a properly adjusted diesel engine can be operated primarily on wood gas introduced through the intake manifold.

Hot combustion gases from the pyrolysis region react with the charcoal to convert the carbon dioxide and water vapor into carbon monoxide and hydrogen. Section 3 contains information on operating, maintaining, and trouble-shooting your wood gas generator; also included are some very important guidelines on safety when using your gasifier system. The goal of any such mod should be to increase temperatures in the hearth reduction zone in order to improve tar cracking.

Once I get gasjfication chance i will try to make a table, showing the energy potential compared to bio fuels per acre The third zone is made up of charcoal from the second zone. For example, the body of the unit consists of a galvanized metal garbage can atop a small metal drum; common plumbing fittings throughout; and a large, stainless steel mixing bowl for the grate.