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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No concerns of the fire climbing up through the wood hopper due to the wood hopper being a sealed oxygen free fuel holding vessel. Thousands of gas works all over the world were eventually dismantled. However, other fuels such as shredded wood, sawdust, and bark can form a bridge that will prevent continuous flow and cause very high temperatures. Once I get a chance i will try to make a table, showing the energy potential compared to bio fuels per acre 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.

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

I think it’s important to provide this kind of disclaimer whenever the FEMA is introduced, especially for those new to the technology. Due to it’s lower temperature range it is a heavy tar producer. Naturally, the people most affected by oil and petroleum scarcity made the greatest advancements in wood gas generator technology.

You can use this to generate biochar as an added benefit. It can be built with a minimum of gaisfier. The goal of any such mod should be to increase temperatures in the hearth reduction zone in order to improve tar cracking.

This report attempts to preserve the knowledge about wood gasification as put into practical use during World War II. The inert char and ash, which wiod the fourth zone, are normally too cool yasifier 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.

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.


For prolonged idling, a hand-operated shaker has been included in the design. The fuel is not quite as robust because the tar is a wasted “potential” fuel.

Library / FEMA Gasifier | Drive On Wood!

Beforegas generator units were a familiar, but not extensively utilized, technology. The tar can be used to tar your roof or your driveway. A closure is only used to preserve the fuel when the engine is stopped. The use of wood gas generators need not be limited to transportation applications.

I have to disagree with you on one point and that is whether this model gasifief a proven design. However, all enthusiasts I know of who use gasification on a regular basis and who started with a FEMA unit have moved on. 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. My experience is very limited, but I remain convinced that a FEMA using a very dry and regularly sized gzsifier fuel gasidier serve in a stationary application reliably for an extended period where the output of the system remains relatively high to keep temperature up.

If one removes most of the volatiles from wood essentially making charcoal gawifier the processthen gasifier design is not so critical. One example welded a restriction plate on 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 ppans through the nozzles. He got good results using charred wood chunks in a FEMA gasifier to fuel his trucks.

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One design also took care to insulate the fire tube. The purpose of a gasifier, then, is to transform solid fuels into gaseous ones and to keep the gas free of harmful constituents.

Personally, I find the videos rather interesting and chose not to marginalize the author’s efforts. In diesel engines, the fuel is sprayed into the combustion chamber as fine droplets which burn as they vaporize.

Imbert gasifier vs FEMA gasifier

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. A cleaner gas producer.

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 The uppermost zone contains unreacted fuel through which air and oxygen enter. As the charcoal reacts with the combustion gases, it eventually reaches a very low density and breaks up into a dust containing all of the ash as well as a percentage of the original carbon.


The United States, never faced with such prolonged or severe oil shortages, has lagged far behind Europe and the Orient in familiarity with and application of this technology; however, a catastrophe could so severely disrupt the supply of petroleum in this country that this technology might be critical in meeting the energy needs of some essential economic activities, such as the production and distribution of food.

This dust may be partially carried away by the gas; however, it might eventually begin to plug the gasifier, and so it must be removed by shaking or agitation. A more robust gas producer. As long as the principle of airtightness in the combustion regions, in the connecting piping, and in the filter units is followed, the form, shape, and method of assembly is not important.

This simple, stratified, downdraft gasifier unit can be constructed from materials that would be widely available in the United States in woox prolonged petroleum crisis. A schematic diagram of the stratified, downdraft gasifier is shown in Fig.

FEMA Gasifier

The open top design ensures uniform access of air to the pyrolysis region. The third zone is made up of charcoal from the second zone. In these twin tasks lie its advantages and its difficulties. The cylindrical shape is easy to fabricate and permits continuous flow of fuel.

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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. That is how I learned Wayne Keith worked pretty well with a modified FEMA design not that I can attest to any working experience as my knowledge is through literature.

Below this zone is the grate. Smoke and gas vented into the atmosphere while new wood was being loaded; the operator bad to be careful not to breathe the unpleasant smoke and toxic fumes. Gasification is a method of collecting the smoke and its combustible components. 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.