Bruce, that was wery informative! I never realised such a proces exists?
Til, l bet is just for binding a % or two wuld be sufficiant but isnt tar allso added in a larger quantity to boost energy density?
There is a publication on DOW library, gengas, that describes all Swedish gasifiers from ww2.
Rindert, couple of problems l see with this first the price and second it seems there is no metering on those things? Just on-off… lt wuld be super nice if they made a controled version of this…
I realised l havent yet sumarised what l am batleing with.
The Mercedes first run on wood. I had fantastic performance and speeds of 120kmh were not a problem. Problem was the hopper. If insulated, the story of my Chevy wuld repeat again. Temperature in the hopper became so high lt started to pirolise hopper content, leading to gasifier stall at idle. It has proved to be wery hard to make a condensing hopper in a closed trunk enviroment and both styles have one thing in comon. Smoke. Refill at the side of a road was no fun with smoke comeing out the trunk. Not to mention any micro leak resaulted in a smoky trunk. A real problem as wood requires a larger fill lid compared to char.
So l moved to charcoal. The updraft gasifier worked well althugh it had less power thain wood. Problem was its bulky hopper (neaded to contain the heat) and too frequent cleaning intervals. After just a couple of refills the dust collected in the reaction zone, pushing it up. Soon, instead of a 60km range (clean gasifier) l was down to a good 20. A PITA to clean. Allso on occasion l must of made tar from sneaked in brands.
So now the goals are:
Hopper MUST always remain cold, smoke free! Thats no problem with charcoal. I was allso thinking to let some air in the hopper and reduce the transition between firetube and hopper to achive enough air velocity to fight back gases wanting to go up in the hopper. Plese share your thods of this.
go downdraft. This way the heat is heading down to the ground instead of up in the trunk. And ofcirse crack tar and steam much better.
recirculate as much gas heat as possible. Not just for economy&performance but mainly to minimise gas cooler surface.
Fuel. To eliminate smoke, charcoal is ideal. Til, your idea of just weting the char seems apealing. Easy to meter (just weigh in a desired amount if water in proportion to char). Self regulating too.
Or Mix a couple of % of woodchips in. Spare some char.