16. of November 2016
Your "mapping" shows clearly where the low-end borders of your gasifier are. And generally.
Increasing the reduction volume and decreasing the bit-size leads to constipation, as ash-blowing does not work well enough in the current flow area.
Another (mechanical) way would be to introduce light sieving
at (every) some bunkering stop.
Meaning, to help the inadequate ash-blowing by letting the "small stuff" flow down between "just-right" angle bars, from one side to the other, alternating.
This could help keeping a bigger reduction volume chemically active by avoiding it to "drown" in ash.
Another idea is to make a grate with a slightly finer "mesh" than the current one...
The current one seems to favor "big or nothing".
Meaning the ratio between angleirons and the "valley" width.
Narrower "valley" to gap!
Now, a big bit can "live" on the "valley", as all smaller ones are consumed by the gas-stream over the gap and dropped through.