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Biomass for 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.
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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Specification of biomass tested in gasifiers
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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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