biology Enlish(13)

GreenFuel Technologies Corporation developed a patented bioreactor system that uses

nontoxic photosynthetic algae to take in smokestacks flue gases and produce biofuels

such as biodiesel, biogas and a dry fuel comparable to coal.[23]

Syngas

Syngas is produced by the combined processes of pyrolysis, combustion, and gasification. Biofuel is converted into carbon monoxide and energy by pyrolysis. A limited supply of oxygen is introduced to support

combustion. Gasification converts further organic material to hydrogen and additional carbon monoxide.

The resulting gas mixture, syngas, is itself a fuel. Using the syngas is more efficient than direct combustion of the original biofuel; more of the energy contained in the fuel is extracted.

Syngas may be burned directly in internal combustion engines. The wood gas generator is a wood-fueled gasification reactor mounted on an internal combustion engine. Syngas can be used to produce methanol and hydrogen, or converted via the Fischer-Tropsch process to produce a synthetic petroleum substitute. Gasification normally relies on

temperatures >700°C. Lower temperature gasification is desirable when co-producing biochar.

Solid biofuels

grown for fuel in the .

Examples of solid biofuels include wood, sawdust, grass cuttings,

domestic refuse, charcoal, agricultural waste, non-food energy crops (see picture), and dried manure.