This looks fine Bob! Althugh l did have problems with glassfiber rope/silicone seal before. I must of done something wrong.
JO oh, the grate comes under the restriction.
Well the idea is for this narrow gap to just be a port for gas/dust, while the actual setling area is under the heat exchanger/filter. Isnt a narrow space desired in this case? (High velocity)
Positive pressure, yes, with wood. And moist char will do the same in a clasical gasifier but l am hoping to avoid it having the hopper separated with the restriction. It shuld let wery litle heat trugh, most being caught with counterflowing fuem. Allso, a wery small amount of fresh fuel can get in the firetube at a time.
Lightup, no idea. But l wuld guess not, its all insulated realy well so the gasifier shuld stay hot for a long time. In this time the moisture from the char in the firetube shuld evaporate and condense in the hopper.
Wich is actualy a concern by it self. I am sure in this system hoppers will be concidered expendable. Being cool, any moisture will condense there causing rust. Will see, if this works out the next one culd be made in SS.
Dave, in a updraft gasifier most of us use, yes, moisture is a huge problem. If you take to acount old char has up to 10% moisture it picked from the air, in a updraft gasifier, all of this ends up diluting the gas.
But this gasifier is a downdraft. Its actualy wery similar in principle to a WK, air cooled firetube, restriction at the bottom… so all the steam must go trugh the glowing heart, cracking it.
You run a updraft gasifier right? You think that wuld work with oil? My fear is oiljust boiling out of char at the top of the burn zone, making smoky gunky gas…
Ha, the Kursk. Yes it got the name after the sub. It is burryed half way in the ground and all the chimneys and stuff look like a submarine surfacing
Bob, yep, what you draw is preety much exactly what l have in mind. I realised the video is deseaving. There is a 2" gap between the restriction and the bottom. But the gasifier is not completely rectangular (height on the front 29cm, back 27cm) so l need to get that inch somehow.
Althugh l plan to make the shaking rod on the other side, towords the driver. Maybee tied with a cable or something to be able to operate it on the go.