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Take note that:
System efficiency is of course dependent on fuel characteristics, load characteristics and environmental conditions
Performance data of a small gasifier in Sri Lanka
can be very efficient at producing hot gases, hot air, hot water or steam, typically recovering 65-90% of the energy contained in the fuel
Lower efficiencies are generally associated with wetter fuels
Also, the efficiency of wood as an energy source varies depending on how it is processed
Identify the Problems:
an open fire only converts about 5% of the wood’s potential energy
depends primarily on good contact between the oxygen in the air and the biomass fuel
this figure reaches from 36% for traditional wood stoves to about 80% for modern wood pellet stoves
The main products of efficient biomass combustion are carbon dioxide and water vapor
The emitted wood gasses are then superheated and mixed with air or pure oxygen for complete combustion (minimal emission only)
however tars, smoke and alkaline ash particles are also emitted