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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About one-third of the way up from the bottom of the gasifier unit, there is a set of radially directed air nozzles; these inject air into the wood as it moves downward to be gasified. The plans are sufficiently detailed so that a skilled welder can fabricate a gasifier for a relatively small expense.


No concerns of the fire climbing up through the wood hopper due to the wood hopper being a sealed oxygen free fuel holding vessel. Consequently further production of volatiles will occur in the reduction zone, leading to tar evolution and tar entrainment in the product gas.

A list of known manufacturers is here. It has been commercially manufactured under various names. We willl need to use appropriate stainless alloys for them, as there will be combustion immediately against the surfaces. The downdraft gasifier startup and response time is intermediate between the fast crossdraft gasifier and the slow updraft gasifier. To put things in perspective, consider the advantages of being able to produce both hot water and woodgas at higher efficiencies and cleanliness, with a greatly extended range of usable fuels and energy output.

If there is insufficient charcoal at the air nozzles, more wood is burned and kmbert to make more charcoal. The volume and passage area in the reduction area, as well as grate arrangement may need adjustment too, to match the smaller grains.


The gasifier is now being used by Syngas Systems, Inc. imbfrt

Gasifier Breakthrough

The vehicle units of World War II had ample vibration to jar the carefully sized blocks through. This principle is extremely important for efficiency, quality of gas, cleanliness of burn and greatly extended turn-down ratio.

Twigs, sticks, and bark shreds must be completely removed.

I have my own fir trees and my own sawmill so I can make chunk wood whatever size is needed for the gasifier to do this job. It supplies low-tar gas from highly volatile fuels with a high turndown ratio.

There appears to be no theoretical limit to how much water can be turned into fuel gas, as long as temperature and time are sufficient for the reaction. As mentioned above, an important function of the oxidation zone, apart from heat generation, is to convert and oxidize virtually all condensable products gasivier the pyrolysis zone.

For more details on my previous work http: In order to avoid cold spots gasifjer the oxidation zone, air inlet velocities and the reactor geometry must be well chosen. Fuel in a hopper gasifies best and most evenly, without bridging, when it is burned, vaporized, gasified evenly imgert the base of a vertical-sided hopper.

In the annular combustor ring, when in combustion mode, the hot gas is mixed with secondary air, where it burns cleanly due to hot temperature and even mixing of gas and air. The constriction at the hearth and the protruding air nozzles present obstructions to the passage of the fuel and may create bridging and channeling followed by poor quality gas output, as unpyrolyzed fuel falls into the reaction zone.

This puts the hearth load for the Imbert type gasifier on a comparable basis to the stratified downdraft gasifier. Dimensions for a variety of Imbert-type gasifiers are shown in Tables and An important factor used in choosing dimensions of any gasifier is the “superficial velocity, Vs,” of the gas calculated where it passes through the narrowest part of the gasification zone.


A high turndown ratio is less important for electric generators and irrigation pumps that constantly operate at full capacity. Once out of the filter unit, the wood gas is mixed with air in the vehicle’s carburetor and is then introduced directly into the engine’s intake manifold. Use of cleaning systems after the gasifier involves difficult waste disposal problems.

Temperatures above F rapidly oxidize metals and thermal-shock ceramic, as when cool fuel suddenly lands on orange-hot refractory or cool air rushes in an empty open hopper. This increases heat transfer greatly by decreasing the boundary-layer of insulating fluid next to the heat-transfer-surface and allowing gravity-stratification, which increases efficiency gasifie throughput is reduced, increasing residence time for greater temperature gradient.

The homemade units gasifidr lasted for 20, miles with many repairs, while the factory-made units operated, with few repairs, up tomiles.

Imbert hourglass hearth variations

Surprisingly, the operation of these units was nearly as efficient as the factory-made units. Below this combustion zone, the resulting hot combustion gases – carbon dioxide CO2 and water vapor H2O – pass into the hot charcoal where they are chemically reduced to combustible fuel gases: I bet it gets hot!

Pages Images and files Insert a link to a new page Loading From gasified gasifiers the gas is first passed through multi-cyclones one per gasifierwhich separates most of the dust and fly ash dragged by the gas. The gas is introduced into the engine and consumed a few seconds after it is made.

The constricted hearth design requires very uniform blocky shapes. Insert image from URL Tip:

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