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 concerns of the fire climbing up through the wood hopper due to the wood hopper being a sealed oxygen free fuel holding vessel. The cylindrical shape is easy to fabricate and permits continuous flow of fuel.

However, all enthusiasts I know of who use gasification on a regular basis and who started with a FEMA unit have moved on. A proven design concept that works very well and is stable if it’s set up correctly. I would stop short in calling this particular design as “proven” Below this zone is the grate. Let me emphasize again that I believe the base FEMA design can be improved considerably to allow acceptable results in stationary applications. 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.

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. All internal combustion engines actually run on vapor, not liquid. Hot combustion gases from the pyrolysis region react with the charcoal to convert the carbon dioxide and water vapor into carbon monoxide and hydrogen. 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.

The foremost question about the operation of the stratified, downdraft gasifier concerns char and ash removal. I mentioned in a previous post some modifications that might be done. 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. Making a combustible gas from coal and wood began around in Europe.


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.

One of the most simple gasifier designs out there.

The goal of any such mod should be to increase temperatures in the hearth reduction zone in order to improve tar cracking. These instructions have been prepared as agsifier manual for use by any mechanic who is reasonably proficient in metal fabrication or engine repair.

The solid, ffema fuels suitable for gasification cover a wide range, from wood and paper to peat, lignite, and coal, including coke derived from coal. Gasification is a physicochemical process in which chemical transformations occur along with the conversion of energy. Most of the volatile components of the fuel are burned in this zone and provide heat femz continued pyrolysis reactions.

The build is a bit more involved and technical. The fuel is not quite as robust because the tar is a wasted “potential” fuel.

Library / FEMA Gasifier | Drive On Wood!

The first question many people ask about gasifiers is, ‘Where does the combustible gas come from? Obviously, it is desirable to use these widely available biomass residues. Because of the wood gasifier’s 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 I am confident you have some insightful knowledge but this sounds a tad bit melodramatic to prove a point.

If the tars get on your hands or your clothes or tools you cannot use soap and water to wash it off.

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gasifjer This region serves the same function as the fuel hopper in the Imbert design. Photographic documentation of the actual assembly of the unit, as well as its operational field test, is included in this report. This report attempts to preserve the knowledge about wood gasification as put into practical use during World War II. In a sense, gasification is a form of incomplete combustion; heat from the burning solid fuel creates gases which are unable to burn completely, due to insufficient amounts of oxygen from the available supply of air.


This includes Wayne Keith whose work I consider to be extraordinary. Much lower gasifiet emissions due to it’s design.

Although I’m still new to working with gasifiers I do have a few feathers under my hat that gave me some basic but solid knowledge on this topic since I’ve acquired some real world “hands on” experience with the construction and the operation of both the Imbert and the FEMA gasifiers plus I’ve read as much as I could on the topic even if some of the technical language was a bit fuzzy to me including watching every video out there I could find.

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. Section 1 describes gasification principles and wood gas generators, in general, and gives some historical background about their operation and effectiveness.

Personally, I find the videos rather interesting and chose not to marginalize the author’s efforts. The uppermost zone contains unreacted fuel through which air and oxygen enter.

Naturally, the people most affected by oil gssifier petroleum scarcity made the greatest advancements in wood gas generator technology. So, yeah, I’m being a tad melodramatic. Solar Dehydrator Plans – Combo Package download.

Imbert gasifier vs FEMA gasifier

A gas generator unit is, simultaneously, an energy converter and a filter. The FEMA design is generally suited to introduce wood gasification and many variations of this design do power vehicles without destroying them.

The FEMA is a good unit for learning, so in that sense it can be useful beyond an emergency unit. I have to disagree with you on one fmea and that is this model is a proven design. 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.