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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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 6.

The wood-fuel is loaded from the feed hopper to the gasifier automatically, to match the gasifiers consumption and to balance the requirement of the wood gas engines. The gasifiers operate at negative pressure, which results from the suction of either the gas engine or a gas blower.

GEK Wiki / Imbert hourglass hearth variations

The total height of the Imbert gasifier is 7. Gasjfier third gasifier, imbfrt is of local design and manufacture, has a higher reduction zone, which enables the gasifier to operate at lower temperatures without tar entrainment in the produced gas.


At start-up charcoal is loaded in and below the hearth zone, with wood on top. Lighting is done with some straw or a piece of paper. After start-up it only takes about five minutes for gas production to begin, because the charcoal reacts very quickly with air in the hearth zone.

The total time of approximately 40 minutes is needed to gasifler full gas production capacity. The air intake is provided by a system of pipes and nozzles, with preheating of the air through heat-exchange with the gas produced. Heat conservation is aided by insulation of the outer jacket.

Sufficiently high temperatures in the oxidation zone give a gas practically free of tar. If operation of the gasifiers is interrupted or terminated, the engines have to be turned off.

Imbert Gasifier

But, if an appropriate temperature has already developed inside the gasifier, gasification re-starts immediately after turning on the suction blower, even after gasifirr stops. The ash content of the wood is approximately one per cent by weight.


Most of the ash and also some fine charcoal fall down into the ash collection chamber, through the lower grate of the gasifier. Normally the grate is moved from time to time by mechanical means.

Imbert hourglass hearth variations

The ash is taken out through a gas-tight service opening, with an automatic ash removal system. This is done with two to three day intervals.

From the 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 amount separated has been on average 0.

After the cyclones the gas is gaxifier through water-scrubbers, coolers, and filters to a secondary charcoal filter, where the final impurities and moisture content of the gas is separated. 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.