BIOMASS & BIOGAS
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Transcript of BIOMASS & BIOGAS
CHAPTER 5Bio-mass Energy
Yogesh, Hiren, Missam Mechanical Dept. LJ Polytechnic
BiomassTerminology Biomass Energy =
energy recovered from biomass – organic matter such as plant material and animal waste
Biomass = recently living organisms
Fossil Fuels = partially decomposed ancient organisms Yogesh,Hiren,Missam Mechanical. LJ
Polytechnic
Fossil Fuel Formation
BiomassHistory Wood was the major fuel
source until the end of 19th century Today developing
countries use wood for ~35% of total energy supply
Early diesel engines were designed and tested to run on peanut oil
Yogesh,Hiren,Missam Mechanical. LJ Polytechnic
BiomassBio Energy cycle
Yogesh,Hiren,Missam Mechanical. LJ Polytechnic
BiomassBio Energy cycle on local scale
Yogesh,Hiren,Missam Mechanical. LJ Polytechnic
Biomass Biomass Resources
Yogesh,Hiren,Missam Mechanical. LJ Polytechnic
Biomass resourcesCorn
Yogesh,Hiren,Missam Mechanical. LJ Polytechnic
Biomass ResourcesSoyabean
Yogesh,Hiren,Missam Mechanical. LJ Polytechnic
Biomass ResourcesSorghum
Yogesh,Hiren,Missam Mechanical. LJ Polytechnic
Biomass ResourcesSugar cane
Yogesh,Hiren,Missam Mechanical. LJ Polytechnic
Biomass ResourcesSwitchgrass
Yogesh,Hiren,Missam Mechanical. LJ Polytechnic
Biomass ResourcesWood chips and sawdust
Yogesh,Hiren,Missam Mechanical. LJ Polytechnic
Biomass ResourcesSolid waste
Yogesh,Hiren,Missam Mechanical. LJ Polytechnic
Creating Energy from BiomassBio Energy Conversion
Yogesh,Hiren,Missam Mechanical. LJ Polytechnic
BiogasWhat is Biogas?
Yogesh,Hiren,Missam Mechanical. LJ Polytechnic
Biogas is clean environment friendly fuel that
can be obtained by anaerobic digestion of animal residues and domestic and farm wastes, abundantly available in the countryside.
Biogas is an important renewable energy resource for rural areas in India
Biogas generally comprise of 55-65 % methane, 35-45 % carbon dioxide, 0.5-1.0 % hydrogen sulfide and traces of water vapor.
Average calorific value of biogas is 20 MJ/m3 (4713 kcal/m3).
Biogas
Yogesh,Hiren,Missam Mechanical. LJ Polytechnic
Biogas like Liquefied Petroleum Gas (LPG) cannot be liquefied under normal temperature and pressure.
Critical temperature required for liquefaction of methane is -82.1oC at 4.71MPa pressure, therefore use of biogas is limited nearby the biogas plant.
An estimate indicates that India has a potential of generating 6.38 X 1010 m3 of biogas from 980 million tones of cattle dung produced annually.
The heat value of this gas amounts to 1.3 X 1012 MJ. In addition, 350 million tones of manure would also produce along with biogas.
BiogasBiogas Production Process
Yogesh,Hiren,Missam Mechanical. LJ Polytechnic
Biogas production process (Anaerobic digestion) is a multiple-stage process in which some main stages are:
Chemical reactions involved in biogas production:
C6H12O6 → 3CO2 + 3CH4
CO2 + 4H2 > CH4 + 2H2O CH3COOH > CH4 + CO2
Yogesh,Hiren,Missam Mechanical. LJ Polytechnic
Out let Pipe
In let Pipe
Digester
Drum
FLOATING DRUM TYPE BIOGAS PLANT
Gas outletInlet
Outlet
BiogasBio gas Plant
Yogesh,Hiren,Missam Mechanical. LJ Polytechnic
BiogasBio gas construction
Yogesh,Hiren,Missam Mechanical. LJ Polytechnic
BiogasDetailed Structure of biogas plant
Yogesh,Hiren,Missam Mechanical. LJ Polytechnic
BiogasContribution of Biogas plant
Yogesh,Hiren,Missam Mechanical. LJ Polytechnic
Better and cheaper fuel for cooking, lighting and power generation. Produces good quality enriched manure to improve spoil fertility. Effective and convenient way for sanitary disposal of human excreata, improving the hygienic conditions. Generate social benefits - reducing burden on forest, reduction in drudgery of women and children. As a smokeless domestic fuel it reduces the incidence of eye and lung diseases.