Biomass for IISc - Netpro Gasification Process
DESI Power does not promote biomass based power plants unless a
sustainable source of supply is available from agricultural or plantation
residues and/or energy plantations and/or agro-forestry.
The biomass that can used as the feed stock are different species
of biomass such as woody plantation and forestry residues, weeds,
cuttings from energy forests as well as briquetted light weight
agricultural residues.
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Casuarina
Eucalyptus Phadauk
Silver oak Pine
Mulberry stalk Ipomea
Jungle wood
Coconut shell Coconut fronds
Cotton stalk Buynath
Coffee husk Sawdust
Groundnut husk
Rice husk
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Typical specifications are given in the table below. More information
available at CGPL.
The biomass needs to be sized to about 60 x 20 x 20 mm, with moisture
content no more than about 15% for the best results. Higher values
of moisture content tend to reduce the efficiency of gasification
and increase the tar content. Fines can be used up to a maximum
of 5% of the total fuel mixture at the point of loading.
The first start of the gasifier requires the reactor to be completely
loaded with dry charcoal but subsequent runs do not require fresh
loading of charcoal, as it gets generated within the reactor.
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• Casuarina
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550 - 650
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15
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75 mm. Mix: 75 mm + branches. Mix: 50% 75
mm + 50%: 10 to 15 mm. Max. 10% sawdust can be added.
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• Eucalyptus
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400 - 650
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15
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50 - 75 mm maximum
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• Phadauk
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1'050 - 1'100
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15
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50 - 75 mm
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• Silver oak
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250 - 300
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20
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50 - 75 mm
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• European Pine
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200 - 250
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15 - 37
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40 - 75 mm
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• Mulberry stalk
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300 - 350
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15
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5 - 20 mm diameter and 20 - 75 mm long
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• Ipomea
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200 - 250
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15
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10 -20 mm diameter and 20 - 50 mm long
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• Jungle wood
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300 - 600
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20
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50 - 75 mm
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• Coconut shell
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1'100 - 1'200
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15
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50 - 75 mm
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• Cotton stalk
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150 - 200
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20
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5 - 20 mm diameter and 20 - 75 mm long
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• Buynath
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1'100 - 1200
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10
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20 mm x 40 mm x 40 mm
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• Briquette:
Sawdust, Coffee husk Rice husketc.
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900 - 1000
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12
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20 - 50 diameter x 40mm height
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Agro Forestry and Energy Plantations
DESI Power believes that as a part of the biomass
management system it will be advantageous to promote agro-forestry
and/or energy plantations on any fallow or under utilised land in
the villages where EmPower Partnership Projects are built.
Agro forestry can increase a farmer's income after a number of years
of looking after the tress. Energy plantations bring slightly quicker
results. But many poor farmers can not afford the expenses associated
with the establishment and maintenance of the trees.
DESI Power therefore works closely with Women
for Sustainable Development who arrange to sell the future sequestration
of C in trees and soil to finance the trees and provide income to
the farmers to meet the costs of etablishment and maintenance.
In the case of fuel plantations the trees that are
extracted from the plots for fuel are not counted in the sequestration
calculations. The amount of CO2 emissions saved by the biomass power
plant is sold separately either as VERs or CERs (See
climateindia.com). The planning and implementation of tree planting
is done by WSD jointly with the villagers themselves who plant trees
suitable for their particular conditions.
Non edible oil seed trees can also be a source of renewable fuel
and additional income to the farmers.
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Biomass cutting machine
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Boy cutting biomass for gasification purpose.
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