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. If you google “fema gasifier” there will be several documents that should pop up. Below is an example. and FEMA EMWE We’rk Unit D . gasifier unit (i.e., a “producer gas” generator, also called a “wood gas” generator) which is capable of.

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No special fuel shape or pretreatment is necessary; any blocky fuel can be used. The third zone is made up of charcoal from the second zone.

During operation of this gasifier, air passes uniformly downward through four zones, hence the name ‘stratified: This means that combustion should be isolated to smaller region for higher peak temperatures i. The filtering must be good enough to capture the tar to protect the engine from being gummed up.

This is an important distinction.

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. Also, the driest possible fuel should be used, and the fuel should be sized properly to minimize bridging or channeling. A prototype design of the stratified, downdraft gasifier design has been developed.

In short, this design i. The cylindrical shape is easy to fabricate and permits continuous flow of fuel. Two-thirds is lost into the environment with the smoke. However, this report is concerned with the operation of four-cylinder gasoline engines rated from 10 to horsepower.

FEMA Gasifier

If one removes most of hasifier volatiles from wood essentially making charcoal in the processthen gasifier design is not so critical. Fuel gas, produced by the reduction of coal and peat, was used for heating, as early as in Europe, and by it had been adapted to fuel engines in England.


This simplified design employs a balanced, negative-pressure concept in which the old type of sealed fuel hopper is no longer necessary. Personally, I find the videos rather interesting and chose not to marginalize the author’s efforts.

Notice the gap between the matchstick and the luminous flame; this gap contains the wood gas which starts burning only when properly mixed with air which contains oxygen. 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. Therefore, in any case I expect a FEMA design to introduce tar into an engine at a rate many times higher than an Imbert all else equal.

All internal combustion engines actually run on vapor, not liquid. A more robust gas producer. Because of the wood gsifier somewhat low efficiency, the inconvenience of operation, and the potential health risks from toxic fumes, most of such units were abandoned when oil again became available in Also, I express some skepticism that any filtration system will catch all the tar.

Awesome point glad someone made itthere are going to be a lot of peoples uses and fuel sources that will differ from use to useand there several types of gasifiers fsma well The foremost question about the operation of the stratified, downdraft gasifier concerns char and ash removal. Below is an example: It’s not a bad idea for use as an emergency unit when nothing else is available – more important, this is precisely what the system is designed to accomplish emergency, and nothing more.

While it can do reasonably well with very dry fuel of a very regular size, it will make a lot more tar than the Imbert under all conditions.

Library / FEMA Gasifier | Drive On Wood!

However, petroleum shortages during World War II led to widespread gas generator applications in the transportation industries of Western Europe.

Beforegas generator units were a familiar, but not extensively utilized, technology. In fact, many people can recall a widespread use of wood gas generators during World War II, when petroleum products were gasiifer available for the civilian populations in many countries.


A schematic diagram of the stratified, downdraft gasifier is shown in Fig. The first question many people ask about gasifiers is, ‘Where does the combustible gas come from?

Imbert gasifier vs FEMA gasifier

You have to use harsh solvents such as gasoline to clean it off and when you stink your house up with the smell of tar and gasoline your spouse will make you give up your gasifier project and dreams or else they will KILL you and bury you in the back yard with it and tell your family that you left the country.

Bats – your most effective insect control. If the tars get on your hands or your clothes or tools you cannot use soap and water to wash it off. Once I get a chance i will try to make a table, showing the energy potential compared to bio fuels per acre However, other fuels such as shredded wood, sawdust, and bark can form a bridge that will prevent continuous flow and cause very high temperatures.

A cleaner gas producer. The nitrogen is not combustible; however, it does occupy volume and dilutes the wood gas as it enters and burns in an engine.

All over Europe, Asia, and Australia, millions of gas generators were in operation between and In diesel engines, the fuel is sprayed into the combustion chamber as fine feka which burn as they vaporize. If you research other forums frequented by those with experience such as driveonwood.

Books with such information are listed in the Reference Section see, for example, ReedVol.

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