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Biomass chemical composition is carbon based and is composed of a mixture of organic molecules containing hydrogen, usually including atoms of oxygen, often nitrogen and also small quantities of other atoms, including alkali, alkaline earth and heavy metals, metals are often found in functional molecules such as the porphyrins which include chlorophyll which contains magnesium.

This means making a fuel out of free materials that are usually found on out surroundings. These are woods from forestry, arboriculture activities or from wood processing, residues from agriculture harvesting or processing, from manufacturing and industrial processes and others.

Now the only question is how are we going to use this biomass as a fuel for boilers? But what is a boiler in the first place? A boiler is defined as “a closed vessel in which water or other liquid is heated, steam or vapor is generated, steam is superheated, or any combination thereof, under pressure or vacuum, for use external to itself, by the direct application of energy from the combustion of fuels, from electricity or nuclear energy.”

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http://forums.ebay.com/db2/topic/Science-Mystery/Natural-Science-Biomass/5200118841