starting a small gasifier build

[Radam]

Since I got alot of time on my hands and too much just theory, I decided to build something as a summer project.

So I will try to make an Imbert type gasifier, but for about small engine. I deducted all dimensions from 4 smallest gasifiers in the table. For 15 Nm3/h I am reasoning that a gasifier dimensions would be :
30 mm hearth diameter
190 mm vessel diameter
60 mm tuyeres-hearth distance
45mm long tuyeres
5mm diameter tuyeres ( 3 of them )

I am not sure if this is all right as I used some imaginative guesses. Its supposed to be able to run 7.5 hp engine. But since I guess this does not take power loss into account I reasoned it for a 5hp engine. That is when I get trough all the construction, piping, filtration and colling, still a long road to go. Also apart from the hearth, I would like to build it as light as possible, but not lighter. I will stitch a sketch later.

I think it would be the easiest to turn two used propane canisters of 20 and 30 centimeters in diameter, into this thing. But I am not sure how durable would a hearth be.

[Steve Unruh]

Radam this looks very good. Angling up the Tuyeres is a technique used to move up the combustion globe, sh-h-h (a secret builders trick). Many of the Swedish & Finnish builders use drilled though stainless steel bolts to durability and allow external in and out adjustments. Swap out for size changes, or use drilled cap nuts on the inside ends of the hollowed drilled bolts. DO USE at least FIVE tuyeres!! Only three allows to much space for tars to bypass unchanged between them. Many builders have had to go back and later add three more between the original three. As often pointed out: the total surface area of the tuyrere openings will prove to be between 3% to 7% of your restriction opening.
Stig-Eric Werners gengas.se site in the LINKS section here shows usage of cutout tank top and bottoms to make the internal sloped rings.
Regards
SteveU.

[Radam]

Ok, this is how I think to make it. The upper part is a hopper as usual, the flange is where it is screwed together with lower shell and hearth part. I am thinking to screw the tuyeres trough both lower parts, not sure yet if making them tilted upwards wouldnt be too much a complication.

It is quite small but for first time, and experimental I am not intending to make it too big or too heavy.

I would appreciate any comments or suggestions before I start cutting. Though I haven't found 20 cm canister, so I would probably just tear up just one.