The wood gasifier design presented in this report has as its origin the proven technology used in World War II during actual shortages of gasoline and diesel fuel. and FEMA EMWE We’rk Unit D. APPROVED FOR .. The wood gasifier design presented in this report has as its origin the proven technology. If you google “fema gasifier” there will be several documents that should pop up. Below is an example.

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Detailed, step-by-step procedures are presented in this report for constructing a simplified version of the World War II, Imbert wood gas generator. The cooling system will need to wlod either larger or a well thought out smart design to reduce heat on the fuel line output before it feeds the engine. I don’t want the thread to turn “heated” to discourage people in anyway The uppermost zone contains unreacted pkans through which air and oxygen enter.

The FEMA design is generally suited to introduce wood gasification and many variations of this design do power vehicles without destroying them.

In the second zone, wold wood fuel reacts with oxygen during pyrolysis. 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 plane below the nozzles which is important for supporting a wide turndown ratio and a variable fuel quality.

You can use this to generate biochar as an added benefit. It can be constructed very quickly in the case of an extreme emergency scenario where time is of essence. If you femx “fema gasifier” there will be several documents that should pop up. The solid, biomass fuels suitable for gasification cover a wide range, from wood and paper to peat, lignite, and coal, including coke derived from coal.


Such knowledge is cema necessary for constructing and operating a wood gasifier. In diesel engines, the fuel is sprayed into the combustion chamber as fine droplets which burn as they vaporize.

A more robust gas producer. If one removes most of the volatiles from wood essentially making charcoal in the processthen gasifier design is not so critical. A simpler filtering system. Section 2 contains detailed step-by-step instructions for constructing your own wood gas generator unit; illustrations and photographs are included to prevent confusion.

Very little to no tar mess to be disposed of or dealt with. Hot combustion gases from the pyrolysis region react with the charcoal to convert the carbon dioxide and water vapor into carbon monoxide and hydrogen. Let me emphasize again that I believe the base FEMA design can be improved considerably to allow acceptable results in stationary applications.

This new technology has several popular names, including ‘stratified, downdraft gasification’ and ‘open top gasification. Gasification is a physicochemical process in which chemical gasifieer occur along with the conversion of energy. I think it’s important to provide this kind of disclaimer whenever the FEMA is introduced, especially for those new to the technology.

In these twin tasks lie its advantages and its difficulties.

FEMA Gasifier

This simplified design employs a balanced, negative-pressure concept in which the old type of sealed fuel hopper is no longer necessary. Such manufactured gas was used for street lights and was piped into houses for heating, lighting, and cooking.

With good charcoal one can generate a clean fuel gas with a steel can and a couple of tubing connections see Gary Gilmore’s work. One of the most simple gasifier designs out there. This is an important distinction. At the bottom of this zone, all of the available oxygen from the hasifier was completely reacted. The use of wood to provide heat is as old as mankind; but by burning the wood we only utilize about one-third of its energy.

Also, the driest possible fuel should be used, and the eood should be sized properly to minimize bridging or channeling. The detailed but simple design is described and illustrated inSect.


Section 1 describes gasification principles and wood gas generators, in general, and gives some historical background about their operation and effectiveness. Making a combustible gas from coal and wood began around in Europe.

In a sense, gasification is a form of incomplete combustion; heat from the burning solid fuel creates gases which are unable to burn completely, gasifoer to insufficient amounts of oxygen from the available supply of air. The reader is urged to use his ingenuity and initiative in constructing his own wood gas generator.

Library / FEMA Gasifier | Drive On Wood!

In the matchstick example above, as the wood was burned and pyrolyzed into charcoal, wood gas was created, but the gas was also consumed by combustion since there was an enormous supply of air in the room. 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.

Below is an example: Thus, the aim of gasification is the almost complete transformation of these constituents into gaseous form so that only the ashes and inert materials remain. If you research other forums frequented by those with experience such as driveonwood. A proven design concept that works very well and is stable if it’s set up correctly. The inert char and ash, which constitute the fourth zone, are normally too cool to cause further reactions; however, since the fourth zone is available to absorb heat or oxygen as conditions change, it serves both as a buffer and as a charcoal storage region.

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It is an emergency unit, and should be used as nothing more. A prototype design of the stratified, downdraft gasifier design has been developed. Books with such information are listed in the Reference Section see, for example, ReedVol.