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 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. If too much char forms during high-load conditions, then the char level rises above the nozzles so gzsifier incoming air burns the char to reduce the char level.

The gasifier as a whole will run hotter and this means that you have to use materials in the reaction zone that can handle or withstand the hotter core temperatures.

The volume and passage area in the reduction area, as well as grate arrangement may need adjustment too, to match the smaller grains. These “simplifications” are “lost” when returning to a full Imbert hearth. The total time of approximately 40 minutes is needed to achieve full gas production capacity.

Imbert gasifier vs FEMA gasifier

It is not necessary to use complex fuel-feeding equipment, because i,bert small amount of air leakage can be tolerated at this spot. The air intake is provided by a system of pipes and nozzles, with preheating of the air through heat-exchange with the gas produced. If tarry gas is produced from this type of gasifier, common practice is to reduce the hearth constriction area until a low-tar gas is produced.


The gasifier is now being used by Syngas Systems, Inc. With this approach, higher-energy-content-gas can be imbeft. Biologically-activated biochar is a major discovery in soil fertility, which can make the family farm more productive, just from the waste biomass accumulated around the farm. Max thank you for the information.

I bet it gets hot! The hearth constriction then causes vasifier gases to pass through the hot zone at the constriction, thus giving maximum mixing and minimum heat loss. Read about the development of this technology and former prototypes at http: In the United States it is conventional to correct measured volumes to STP, “standard ggasifier and pressure. We have now fabbed the seeming most desireable option, which is pictured and CADed below. The end product of the chemical reactions that take place in the reduction zone is a combustible gas which can be used as fuel gas in burners and after dust removal and cooling is suitable for internal combustion engines.

Although I’m still new to working with gasifiers I do have a few feathers under my hat that gasifire 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 imbrt 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.

These parameters will have to be tested to know for sure. Therefore, a little agitation can effectively increase the maximum specific hearth load.

Imbert Gasifier

Jim Mason has answered my question in a comment on Brian G. To turn text into a link, highlight the text, then click on a page or file from the list above. Usually a moveable grate in the bottom of the equipment is considered necessary. Your spouse will KILL you when some of it gets on the furnature from your clothes. Insert a link to a new page.


The charcoal is supported by a movable grate that can be shaken at intervals. 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. Char will shrink, this is normal as it is converted hopefully to CO and not just CO2.

Gasifker 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. The ash is taken out through a gas-tight service opening, with an automatic ash removal system. The maximum hearth load is limited by many factors, such as the mechanical integrity of the char bed structure within the gasifier, degree of agitation, and the time available for conversion.

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. Solid fuel gasification and combustion produces ash, which collects on all horizontal surfaces, blocking passageways and requiring cleaning.

A low specific hearth load may also cause tar formation problems. This principle is extremely important for efficiency, quality of gas, cleanliness of burn and greatly extended turn-down ratio. The reduction in area at the hearth and the protruding nozzles present hazards at which the passage of fuel can be restricted, thus causing bridging and channeling followed by high tar output, as unpyrolyzed biomass falls into the reaction zone.

Imbedt challenges have been grist for my explorations into this technology. But, if an appropriate temperature has already developed inside the gasifier, gasification re-starts immediately after turning on the suction blower, even after longer stops.