The purpose of the report was to develop detailed, illustrated instructions for the fabrication, installation, and operation of a biomass gasifier unit i. The instructions to build a gas wood generator have been prepared as a manual for use by any mechanically minded person who is reasonably proficient in metal fabrication or engine repair. The tar is cumulative and can wreck havoc with engines. The key point about the FEMA gasifier plans is that it was developed for emergency use. There are so many variables for this simple design such as: fuel type, size, density, humidity and moisture content.
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Marcos Buenijo wrote: It is an emergency unit, and should be used as nothing more. I am confident you have some insightful knowledge but this sounds a tad bit melodramatic to prove a point. Wayne Keith worked pretty well with a modified FEMA design not that I can attest to any working experience as my knowledge is through literature. The FEMA is a good unit for learning, so in that sense it can be useful beyond an emergency unit. However, all enthusiasts I know of who use gasification on a regular basis and who started with a FEMA unit have moved on.
This includes Wayne Keith whose work I consider to be extraordinary. He got good results using charred wood chunks in a FEMA gasifier to fuel his trucks. This is an important distinction. If one removes most of the volatiles from wood essentially making charcoal in the process , then gasifier design is not so critical.
If you research other forums frequented by those with experience such as driveonwood. My experience is very limited, but I remain convinced that a FEMA using a very dry and regularly sized wood fuel can serve in a stationary application reliably for an extended period where the output of the system remains relatively high to keep temperature up.
One example welded a restriction plate on the end of the fire tube and supplied air to the fire tube via nozzles, and closed off the hopper so all air entered the system through the nozzles. One design also took care to insulate the fire tube. Adding the restriction plate to the base of the fire tube serves a couple functions: 1 ash will accumulate at the base of the firetube between the restriction and inner firetube wall to help insulate, and 2 the combustion gases including tar is force through the restriction where temperatures will be highest.
Adding additional insulation can further raise temperatures there which is important for tar reduction. 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.
So, there is some evidence that a few relatively simple modifications to the FEMA can dramatically improve its performance.
The Stratified Downdraft Gasifier 1. What is a wood gas generator and how does it work? The purpose of this report is to develop detailed, illustrated instructions for the fabrication, installation, and operation of a biomass gasifier unit i. These instructions have been prepared as a manual for use by any mechanic who is reasonably proficient in metal fabrication or engine repair. Before , gas generator units were a familiar, but not extensively utilized, technology. However, petroleum shortages during World War II led to widespread gas generator applications in the transportation industries of Western Europe. Charcoal-burning taxis, a related application, were still common in Korea as late as
FEMA Gasifier Plans
Arashiramar Bats — your most effective insect control. The wood gasifier design presented in this report has as its origin the proven technology used in World War II during actual shortages of gasoline and diesel fuel. 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. Also, I express some skepticism that any filtration system will catch all the tar. Also, the driest possible fuel should be used, and the fuel should be sized properly to minimize bridging or channeling. Gasification is a method of collecting the smoke and its combustible components.
Before , gas generator units were a familiar, but not extensively utilized, technology. However, petroleum shortages during World War II led to widespread gas generator applications in the transportation industries of Western Europe. Charcoal-burning taxis, a related application, were still common in Korea as late as The United States, never faced with such prolonged or severe oil shortages, has lagged far behind Europe and the Orient in familiarity with and application of this technology; however, a catastrophe could so severely disrupt the supply of petroleum in this country that this technology might be critical in meeting the energy needs of some essential economic activities, such as the production and distribution of food. The liquid fuels used in gasoline engines are vaporized before they enter the combustion chamber above the pistons. In diesel engines, the fuel is sprayed into the combustion chamber as fine droplets which burn as they vaporize. The purpose of a gasifier, then, is to transform solid fuels into gaseous ones and to keep the gas free of harmful constituents.