A true story:
A man in Beijing asked for SIEMENS compensation as his SIMENS refri exploded.
SIEMENS answered no, it is not possible.
The man got very angry and reported to many news media.
Later the media found that the man put hair gel inside his refri, and the hair gel exploded
WOOD pellet stove is very popular in American.
But there is not enough saw dust to make WOOD pellet.
Someone tried to make pellet by straw and grass.
Then WOOD pellet stove does not work any more with straw/grass pellet.
The sugar content of Straw /grass is much higher than WOOD.
The sugar will result in clanker other than ash.
Ash will be blown away from burning pot.
Clanker simply blocks burning pot.