Imbert Gasifier – The constricted hearth, downdraft gasifier in the figure below ( more detail can be found in the FEMA plans) is sometimes called the Imbert. 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. It can be a stand-alone gasifier, heating water by cooling the gas, to be used to . is often the case in the upper throat of an Imbert or constricting throat gasifier.

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A filter containing a fine mesh is used to remove the last traces of any ash or dust that may have passed through the cooling unit. But when World War II started, it took six to eight months before factory-made gasifiers were widely available. What I keep seeing is on three of the times we let Marcus Bryners GEK consume down to out of fuel it was possible to look in and see the glowing cone of char in the reduction cone oxidizing and shrinking away.

Before the clean and dry wood gas is finally fed to the engines, it is slightly compressed, with the aid of an electrically driven compressor and stored in a buffer tank. One air nozzle is in line with this port, allowing the operator to ignite the charcoal bed through this nozzle. The vehicle units of World War II had ample vibration to jar the carefully sized blocks through. Groeneveld 17 takes the time necessary for complete devolatilization to be equal to or larger than the Fourier time for heating up.

Imbert gasifier vs FEMA gasifier

However, the difference between ideal and practical has been significant in the history of gasification, largely because waste fuels are not homogeneous and measurable like gasoline and natural gas. Although engineers often oversize equipment, this can be fatal in gasifier design. Additionally, charring advances also progressively. The reasons for this discrepancy are not completely clear.

Roundy has been designed from the following. The spaces between the nozzles shown in Fig.

The nozzles are attached to a distribution manifold that in turn is attached to the outer surface of the inner can.

Table shows successful nozzle sizes gasifief wood-fueled Imbert gas producers and the wider variation for nozzles used in successful Imbert and SGB gasifiers.

The charcoal is supported by a movable grate that can be shaken at intervals. Some efforts to scale the Imbert gasifier to larger sizes have realized a disastrous increase in tar production Goss ; Graham If too much char forms during high-load conditions, then the char level rises above the nozzles so that incoming air burns the char to reduce the char level.


The tars must be disposed of and they emit foul odors. A conical grate at the base rotates to dump ashes and break up any bridging. The gasifiers are fed by means of conveyors from the day-hoppers which are installed at the front of the gasifiers in an underfloor pit see figure gasiier.

Imbert hourglass hearth variations

As mentioned above, an important function of the oxidation zone, apart from heat generation, is to convert and oxidize virtually all condensable products from the pyrolysis zone. These “simplifications” are “lost” when returning to a full Imbert hearth. This is covered in more detail in the second section. In this zone the sensible heat of the gases and charcoal is converted as much as possible into chemical energy of the producer gas see equations a bsection 2.

The turndown ratio of World War II gasifiers varied between 3 for Imbert-style gasifiers with uninsulated V-hearth gasifiers and 18 for highly insulated V-hearth gasifiers.

I have to start thinking in terms of the increased gas volumes created that must be accomodated. 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.

When your voice speaks I hear experience not just speculation. Skov ; Nunnikhoven ; Rissler Dimensions for a variety of Imbert-type gasifiers are shown in Tables and This gasification method is called “producer gas generation,” because no storage system is used; only that amount of gas demanded by the engine is produced.

The pieces gasify at different rates, and the difference in moisture, ash, elemental composition, slagging temperature, oxygen and CO2 penetration of the coal-bed, feed considerations, etc.

However, researchers have met with more success when the fuel size has been increased with the gasifier size. The fuel gas can be generated cooler and wetter and sootier for direct combustion it all burns clean at the right temperature and residence time, with the imbett amount of air mixed evenly. Part of it may be reduced to hydrogen see equation bparagraph 2.


This occurs because the combination of lower temperatures and low fow rate favors methane and tar production. This removes heat from the bottom plate and bottom of ash-shell, preheating the air.

It is relatively inexpensive, uses simple construction materials, is easy to fabricate, and can be operated by motorists with a minimum amount of training. The interior hot zones are gaasifier cast-ceramic or high-chromium stainless steel, The bottom half would be created as the char spills out onto the grate. Sufficiently high temperatures in the oxidation zone give a gas practically free of tar. A distinction is made hasifier “no throat” “single throat” and “double throat” Imbert type designs see Figure 2.

A simpler filtering system. When the, engine is shut off, the production of gas stops. These plans are offered to you FREE. Since green biomass can often be half water, and the other half of bone-dry wood combusts with more Oxygen from the air into more-than-its-weight of additional water vapor!

In fact, an entire industry emerged for gasufier wood for use in vehicles at that time Reed and Jantzen It is relatively inexpensive, uses simple materials of construction, is easy to fabricate, and can be operated by ikbert with a minimum of training.

GEK Wiki / Imbert hourglass hearth variations

In the annular combustor ring, when in combustion mode, the hot gas is mixed with secondary air, where it burns cleanly due to hot ggasifier and even gasiffier of gas and air. In practice, gasifiers that fuel engines generally use the suction of the engine to move air through the gasifier and cleanup train. Air gasifiers can be operated either by forcing air through the fuel pressurized or by drawing the air through the fuel suction.

More information is provided in later discussions. Here’s some ways we can implement traditional Imbert hourglass type hearths in the GEK.

There will be an operating range where the gas is the cleanest, and another condensing range where efficiencies of both gas and hot water production are highest, and an upward range where exhaust is too hot to condense.