Converting Waste Agricultural Biomass into a Resource - UNEP

Fluidized Bed Combustor for Steam Generation 109
Philippines, Research
Crop
Residue
Process
Equipment
Main Product
Wood
Dry sawdust
Combustion
Fluidized Bed Combustor
Steam
Technical Description of Technology
Fluidized Bed Combustor for Steam Generation Optimum operating
conditions are obtained using dry sawdust at 14% moisture content as fuel,
with temperature of 92oC. An energy audit on the system showed that the
FBC unit had an overall thermal efficiency of 70% with pollution-free exhaust
even when low-grade fuels were used.
Fluidized Bed Combustor for Steam Generation 110
The system consists of a fluidized-bed reactor, variable speed screw feeder,
fluidizing air blower, induced draft fan and dry cyclone particle separator
integrated with a 15Hp, 100psi, 2-pass, horizontal return tube boiler.
Fuel feeding the unit was easily controlled, and on automatic mode
approached the convenience of fossil oil fuel. Initial tests showed that the
boiler coupled to the system reached 85% of its rated capacity.
Potential Industry User
Medium scale steam-using wood processing plants.
Justification/Profitability Indicators
Cost of Equipment : P 1.2 M
NPV : P 577,500
Savings in cost of diesel fuel : P 393,400/yr
(Partial Budget Analysis)
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