Coke is an excellent fuel,but that said, requires a much different approach.
As Berlin has said coke is very light,some will float on water, thereby you
need a large firebox in a hand fed stove to be able to get reasonable burn
times between filings.In a large tractor dump trailer (40') you can heap the load
and still be legal <80,000#.
Coke is very pure form of carbon so has a need to have a forced air draft to
keep a good burn,also a very narrow burning range and works best in a
steady burn condition for maximum efficiency.
When coke is made the bituminous coal is heated (Burned) in a closed
oven driving off the volatile compounds leaving a carbon sponge full of
holes but still retaining some of the ash and other not burnable compounds.
The very pure nature of the product is why it is used in the steel making
process,it doesn't add undesirable elements to the steel.
I wouldn't use it in a hand feed stove because of the short burn times,and
usually the absence of a forced draft.