l have run pellets in a normal wood chunk gasifier. No special modification. Simply put, its easyaly the best fuel one can burn. Matt allready wrote down why, but after tar problems that MAY (it is possible but not sure) have happent from burning pellets, l decided not to use them any more unless absolutely nessesery.
Compared to chunks, pellets gave me about 20% batter performance!
The easy flow of pellets can sometimes be a problem. At lightup, the cavity in the oxy zone may get filled with raw pellets, l had them fallen past the restriction in some occasions, this is a recepie for tar.
Allso, if building a pellet gasifier, l wuld make a stratified auguer fed gasifier, or a normal lmbert with a small oxy zone and a HOT HOPPER. The last is most important!
In my previous build, l had a hot insulated hopper. At no point it was possible to get any liquids in the hopper, so the pellets stayed dry eaven after cooldown and l had no problems relighting a hopper full of previously cooled charge.
On my new system, l have a cold condensing hopper. Putting pellets in here wuld be nothing short of a disaster. The top of the wood in the hopper is allways moist. Pellets wuld turn to sawdust after minutes!