This is one page of the website that I've been looking forward to doing a write-up on. 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.
Imbert gasifier vs FEMA gasifier
A cleaner gas producer. A more robust gas producer. Much lower tar emissions due to it's design. Very little to no tar mess to be disposed of or dealt with. No concerns of the fire climbing up through the wood hopper due to the wood hopper being a sealed oxygen free fuel holding vessel. A simpler filtering system. A proven design concept that works very well and is stable if it's set up correctly.
The Imbert gasifier pros:
The Imbert gasifier cons:
The build is a bit more involved and technical. The guidelines must be met to match the Imbert to the engine it will be running to achieve
the correct temperatures to crack the tars down into a useful part of the fuel. 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 cooling system will need
to be either larger or a well thought out smart design to reduce heat on the fuel line output before it feeds the engine.
The FEMA gasifier pros:
One of the most simple gasifier designs out there. It can be constructed with the most basic materials on hand. It can be constructed very quickly in the case of an extreme emergency scenario where time is of essence. It can be built with a minimum of tools. A proven design concept that works very well and is stable if it's set up correctly. The FEMA gasifier was only meant as a last resort emergency fuel source so it was never intended to be used as a long term fuel source. The tar can be used to tar your roof or your driveway. (Yep pun intended)
The FEMA gasifier cons:
Due to it's lower temperature range it is a heavy tar producer. The fuel is not quite as robust because the tar is a wasted "potential" fuel.
Being an open top air fed design, the fire from the reaction zone can climb straight up through the fuel and waste it and it can cause the gasifier to run very hot and inefficent. The filtering must be good enough to capture the tar to protect the engine from being gummed up. The tars must be disposed of and they emit foul odors. If the tars get on your hands or your clothes or tools you cannot use soap and water to wash it off. Your spouse will KILL you when some of it gets on the furnature from your clothes. You have to use harsh solvents such as gasoline to clean it off and when you stink your house up with the smell of tar and gasoline your spouse will make you give up your gasifier project and dreams or else they will KILL you and bury you in the back yard with it and tell your family that you left the country.
Rocket stove videos and links
Useful misc electronic projects