Abandon the rotary stiring device. The material drag of the chips mass will stall it out or break it up.
Go back to the old stationary gas plant days and use heavy vertical dropping rods. Rotary electric moter cam lifted. Then cam-notched, dropped.
Go to the IISc.cgpl site and see from their later systems that all of theses do have water-ring sealed cone top-hats. You must control the upper system in allowed air. Open. Then batch feed. Drop back down air sealed.
Others have valid commented on other problems you will have.
Best Advice from me.
Accept that in any complex system that you will have to use-experiences develop a small core of true System human Operators. “Chef’s” These men/women will operate by sight, smell, sound, touch-feel, and a seeming developed sixth sense of the system.
ALL functioning manufacturing systems, human service systems, depend on developing a dedicated core group of true Operators. These can be women. In my experiences especially women understand coordinating very complex cooking events out to successful conclusions.
The University types with letters in front and behind names Intellects are good at postulating possibilities.
The Design Engineers good at numbering out, in materials uses, applying the geeked possibles.
True Operators are what makes real works happen day to day, sustainable. Learn to respect this. Give then override operational authority. Or join 40 years of big biomass systems failures.