Well performed traditional reduction – filtering, with its
“baked – in” property of selfclogging.
Constantly needing outside intervention of some sort; babysitting or timed mechanical releif handling…
Some time ago Kristijan attempted sifting with the exiting gas stream – with success.
Upstreaming sifting from the periphery of the reduction char.
Then the gas can be cleaned in an efficient cyclone, which is easily emptied at longer time intervals.
The sifting downward can also be performed:
Fredrik Ek rebuilt his gasifier system many times.
One stage was built in a fashon with a conical metal cone enlargening from the restiction in 60* downward, ending with a large grate (whole-area).
This had a notorious habit to clog all the time; independent of
full – gas driving on a motor – way, or slow town traffic.
But with covering the cone – bottom with a whole plate, with an exception of a center area (effective area) in a smaller grate – area
equal to the restriction area the reduction char kept itself clean and functional.
This, on open road conditions, but in town trafic it started clogging again, opening fast again on open road.
The profile of the active (moving) char was like a prism;
first 60* outward, and then 60* inward to the grate opening.
In a traditional Imbert GMR with a “tight” whole area grate,
the ash is mostly blown outward to the periphery, where the velocity is lower.
If the restriction is prolonged half-ways down to the grate,
still, with the same diameter, one can expect to start a vertical hemispherical circulation where the peripheral region goes in up-stream.
The grate has to be a solid plate from center to the half, or better 3/4 – diameter in order to link the downstream initially horizontally, thereby helping the hemispherical circulation to start.
This is the foundation of vertical sifting, if the gas out-take is placed high up under the restriction-plane (screened if avoiding char-blow is wanted).
In this direction Kristijan was building… going further with no ash-bin at all.
The out-take has to go around the heart (at the restriction hight) for getting symmetry.