For those interested in using coconut husk (not shell)
Unprocessed coconut hulls make lousy fuel.
Coconut hull fiber are generally know as coir.
It is a big business in India.
The fibers are processed into mats, carpet backing, potting material, and geotextiles (for erosion control).
On a small scale, the hulls can be soaked in water for at least a month and beaten to break the pith and used as mulch.
The pith leftover from fiber production is known as cocopeat.
It is generally a coarse powder. It can apparently be made into fuel pellets for gasifier stoves. See attachments.