Well, I decided that six years is long enough to wait to build my second gasifier (I’m so lazy…or…uh…‘well researched’). I started out thinking about what type of nozzle to use. Actually, I had been thinking about nozzle types for a lllllooooonnnnggggg time. I wanted something that would be robust and give good longevity (as everyone else who builds a gasifier is striving for).
I decided to try a design similar to Kristijan’s idea where you have a larger pipe with holes on the top so the heat is spread out over a larger area and not concentrated above a single opening. I was in the plumbing section at the hardware store and just kind of piecing things together to see if something stood out. What I ended up going with was a 2 inch pipe coming up through the center bottom and using a pipe cap with holes drilled in the top. If the nozzle proves to stand up to the temps, that will be great, and being a threaded part, replacing it if it wears out will be fairly easy.
For the gasifier body, I used another of the ammo tubes that I had sitting around since my first gasifier build.
Then, I ran the gasifier for the first time. I just lit it from underneath and used my small mattress pump as the blower. I ran it at the highest velocity I could and it ran for about 15 minutes. Then the sump pump hose started to melt so I shut it down. I waited until it was cold and dumped the charcoal to check the condition of the nozzle. What I saw made me feel good. Besides being a little ash covered, it looked to be in great shape.
After the second run of about another 15-20 minutes, this is the nozzle (I wiped the ash off of it this time):
Here are a few of the flare videos:
At this point, I am really excited about this build. It is my first time welding in a gasifier project. I need to fabricate an adapter for my lawnmower’s intake so I can test this out fueling an engine. Being that the nozzle points up, I figure lost at least 6 inches of hopper space versus the “pipe through the side” gasifier. So, I want to see how much runtime I get on an actual engine.
You can see more of the build and run videos on my Youtube channel. https://www.youtube.com/user/budoboy77