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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In diesel engines, the fuel is sprayed into the combustion chamber as fine droplets which burn as they vaporize. For prolonged idling, a hand-operated shaker has been included in the design. The tar can be used to tar your roof or your driveway.

A more robust gas producer. The FEMA gasifier was only meant as a last resort emergency fuel source so it was never intended to be used as a long term fuel source. A prototype gasifier unit was fabricated from these instructions.

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The purpose of this report is to develop detailed, illustrated instructions for the fabrication, installation, and operation of a biomass gasifier unit i.

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.

An important issue in the design of the stratified, downdraft gasifier is the prevention of fuel bridging and channeling. The tars must be disposed of and they emit foul odors. Plabs gas generators are not technological marvels that can totally eliminate our current dependence on oil, reduce the impacts of ffema energy crunch, or produce long-term economic relief from high fossil fuel prices, but they are a proven emergency solution when such fuels become unobtainable in case of war, civil upheaval, or natural disaster.

It should be acknowledged that there are alternate technologies such as methane production or use of alcohol fuels for keeping internal combustion engines in hasifier during gasiifier prolonged petroleum crisis; the wood gasifier unit described in this report represents only one solution to the problem.


This report attempts to preserve the knowledge about wood gasification as put into practical use during World War II. It can be constructed with the most basic materials on hand. If you google “fema gasifier” there will be several documents that should pop up. More to the point and my intention, I think it is polite to give credit to the person in the video who constructed a polished prototype and in my opinion presented the design very clearly. If more information is needed about operating gasifiers on other fuels such as coal, charcoal, peat, sawdust or seaweedfdma list of relevant literature is contained in the Bibliography at the end of this report.

This unit was then mounted onto the front of a gasoline-engine farm tractor and successfully field tested, using wood chips as the only fuel; see Fig. High-grade biomass fuels such as wood blocks or chips will flow down through the gasifier under the influence of gravity, and downdraft air flow.

Stationary engines can also be fueled by wood gasifiers to run electric generators, pumps, and industrial equipment. The detailed but simple design is described and illustrated inSect. Both the Imbert gasifiers and the stratified concept have a provision for shaking the grate; when plana are used to power vehicles, they are automatically shaken by the vehicle’s motion.

Notice the gap between the matchstick and the luminous flame; this gap contains the wopd gas which starts burning only when properly mixed with air which contains oxygen. In creating wood gas for fueling internal combustion planz, it is important that the gas not only be properly produced, but also preserved and not consumed until it is introduced into the engine where it may be appropriately burned.

The guidelines must be met to match the Imbert to the engine it will be running to achieve the correct temperatures to crack the tars down into a useful part of the fuel. New Aquaponics Series from Jack Spirko. Obviously, it is plaans to use these widely available biomass residues.

I am not aware of an account where a genuine FEMA design has been used to operate an engine over an extended period without problems when I write “extended”, I mean at least hours of engine operation and preferably gasjfier He got good results using charred wood chunks in a FEMA gasifier to rema his trucks.


This simple, stratified, downdraft gasifier unit can be constructed from materials that would be widely available in the United States in a prolonged petroleum crisis. One example welded a restriction plate planw the end of the fire tube and supplied air to the fire tube via nozzles, and closed off the hopper so all air entered the system through the nozzles.

Very little to no tar mess to be disposed of or dealt with. Personally, I find the videos rather interesting and chose not to marginalize the author’s efforts.

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

No concerns of the fire climbing gazifier through the wood hopper due to the wood hopper being a sealed oxygen free fuel holding vessel. 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. In short, this design i.

In the second zone, the p,ans fuel reacts with oxygen during pyrolysis. A gas generator unit is, simultaneously, an energy converter and a filter. Being an open top air fed design, the fire from the reaction zone can climb straight up through the fuel and waste it and it can cause the gasifier to run very hot and inefficent.

The use of wood gas generators need not be limited to transportation applications. I wouldn’t run a car on a FEMA unless it was a one-way trip Pick your direction based on the zombie apocalypse de jour but for a cheap briggs engine, sure.

Let me emphasize again that Agsifier believe the base FEMA design can be improved considerably to allow acceptable results in stationary applications.

The eood is urged to use his ingenuity and initiative in constructing his own wood gas generator. This simplified design employs a balanced, negative-pressure concept in which the old type of sealed fuel hopper is no longer necessary.