bioenergy resources in india 22
TRANSCRIPT
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SHRI MATA VAISHNO DEVI UNIVERSITY , KAKRYAL , KATRABIOENERGY POTENTIAL OF INDIA
BIOGAS DIGESTERS TYPES OF BIOFUELS
ASSIGNMENT OF NON – CONVENTIONAL ENERGY SOURCESTEACHER CONCERNED:
DR. V.V. TYAGI
PREPARED BY:ANAM MUKTHAR
( 16-MRE-010)
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TOPICS OF DISCUSSION
•BIOENERGY POTENTIAL
•BIOGAS DIGESTERS
•TYPES OF BIOFUELS
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WHAT IS BIOENERGY?• Energy from biomass
• Plants capture energy from the sun through
photosynthesis.
– Carbon dioxide (CO2) + sunlight + water sugar
• The energy is stored in plants as cell mass.
• The stored energy in plants (biomass) can be used to
produce .
– Fuels
– Heat
– Power (electricity)
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WHY USE BIOMASS AS AN ENERGY SOURCE?
▫Oil is a scarce resource.
▫Countries are becomming more and more dependent on oil
i.e. oil import from other countries are increasing.
▫Greenhouse effects –Kyoto protocol calls for reduction of
CO2 emissions.
▫The biobased economy must be established in the 21’st
century.
▫Biomass can provide a substantial part of our energy supply.
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6
THE BIOENERGY CYCLE
http://www.renewcology.nu
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BIOMASS ENERGY CONVERSION PROCESSES
S.NO. PROCESS INPUT FEEDSTOCK
CONVERSION TEMPERATURE
CONVERSION PRESSURE (0 C)
CHARACTERISTICS OF PROCESS
PRODUCT FORM
PROCESS YIELD ( % OF ORIGINAL MASS)
1. Anaerobic fermentation
Aqueous slurry (30%-20% solids)
20 -50 Atmospheric
Fermentation of wastes or algae grown on waste of energy crops
50% -70% methane , remainder co2
20 - 26%
2. Biophotolysis Aqueous slurry for algae, bacteria and protein – enzyme complexes
20 -50 Atmospheric
Sunlight produces `intracellular enzymatic reduction of H2O
Hydrogen
3. Acid Hydrolysis
5% acidified slurry (H2SO4 with cellulose)
20 -50 Atmospheric
Glucose fermented to ethyl alcohol. Cellulose hydrolized to glucose.
Ethyl Alcohol
4. Enzyme Hydrolysis
Aqueous slurry (cellulose rich)
20 -50 Atmospheric
Extracellular enzymatic conversion of cellulose to sugar to alcohol.
Ethyl Alcohol 90%
5. Combustion Dried feedstock (10-25% H2O)
1200-1300 Atmospheric
Augments(5-20%) boiler fuel
Heat , steam converted to electricity.
6. Pyrolysis Dried feedstock 500-1300 Atmospheric
1/3 of char is produced .o2 free environment used.
Oil Char gas
40%20%
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BIOENERGY POTENTIAL IN INDIA
RESOURCE:NON-CONVENTIONAL ENERGY SOURCES AND UTILISATION SECOND REVISED EDITION (2014);R.K.RAJPUT
S.NO. RESOURCE ESTIMATED POTENTIAL(MW)
ACHIEVEMENT UPTO JAN. 2009 (MW)
1. Biopower (wood biomass) 52,000 683
2. Waste-to-energyi) Grid interacted powerii) Distributed power
5,000
50,000
34.95
11.03
3. Biomass gasifiers - 87 4. Cogeneration bagasse 5,000 1034
5. Family type biogas plants 120 lakhs 39.8 lakhs
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BIOMASS POTENTIAL IN INDIAS.NO. RESOURCES POTENTIAL
1. Surplus biomass 17000 MW
2. Cows manure and poultry droppings 1500 MW
3. a) Urban Wastes
b) Industrial Wastes
2600 MW
1300 MW
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INDIA AND THE BIOENERGY
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ADVANTAGES OF BIOENERGY
• Bio fuels are friendlier to the nature than fossil fuels.
• The fossil fuel reserves will decline biofuels’
importance rises.
• Diversifying energy sources.
• Employment.
• Energy supply for developing countries.
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BIO FUEL
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FROM BIOMASS TO BIOFUEL
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BIOFUELS
• Most biomasses are also bio fuels as such.
• Biomass can be refined into fuels that are easier to
store, transport, and use.
• Processed biofuels are:
– Solids: Processed solids
– Liquid: Liquid biofuels
– Gas: Biogas12
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HISTORY
• An important fuel for most of
mankind's history is the Invention
of gasoline-burning, internal
combustion engine (late 19th
century) change toward coal and
petroleum-based fuels.
• Use of biofuels began to rise
during the 1970’s .16
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NATIONAL BIO-FUEL POLICY
•Announced in December, 2009.
•Development and utilization of indigenous non-
food feedstock's raised on degraded or waste
lands.
•Thrust on research and development on
cultivation, processing and production of bio
fuels.
•20% Ethanol and Bio-diesel blending by 2017 –
current target is 5% blending – achieving ~ 2%.
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TYPES OF BIOFUELS
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PROCESSED SOLIDS
• Charcoal
• Pellets
• Briquettes
• Wood chips 19
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CHARCOAL
• Oldest processed biofuel.
• Produced from all tree species and parts of plants,
hardwood considered the best.
• Produced through pyrolysis and carbonisation:
– wood is heated to about 500°C
in absence of oxygen.
http://www.renewcology.nu 20
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THE PRODUCTION OF CHARCOAL
1. Preparation of wood.
2. Drying – reduction of moisture content.
3. Pre-carbonization – reduction of volatiles content.
4. Carbonization – further reduction of volatiles
content.
5. End of carbonization – increasing the carbon
content.
6. Cooling and stabilization of charcoal. 21
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PELLETS
• Made out of woody residues.
• Cylindrical or cubic granules.
• Production: drying and possibly grinding and then
compressing biomass.
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BRIQUETTES
• Produced by compressing dry sawdust, grinding dust or
cutter chips.
• Cylindrical.
• Diameter between 50 and 80 mm.
• Net calorific value is 17mj/kg.23
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WOOD CHIPS
• Waste product of forestry operations.
• Made in mechanical chippers.
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LIQUID BIOFUELS
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• Generated by gasification, fermentation, and pyrolysis
technologies.
• Ethanol
• Methanol
• Vegetable oils
• Biodiesel
• Pyrolysis bio-oil
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ETHANOL • Sugars are fermented into ethanol:
– C6H12O6 2C2H5OH + 2CO2
• Ethanol can be used as
– a fuel
– reacted with isobutylene to form ethyl tertiary butyl ether (ETBE) for blending
with gasoline.
• Environmental benefits
– CO2 emission is reduced.
– current world production of ethanol fuel is about 20 to 21 billion litres annually
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ETHANOL
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METHANOL
• Produced by gasification
– Synthesis gas (mainly H2 and CO) at high temperatures (>1000K):
CO + 2H2 CH3OH +heat
– Excess hydrogen (with catalyst):
3H2 + CO2 CH3OH + H2O
• Methanol is used as
– a fuel as such
– reacted with isobutylene methyl tertiary butyl ether (MTBE) for blending with
gasoline. 28
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VEGETABLE OIL
• Produced from plants using extraction technologies.
• Extraction process
– the oil bearing part of the plant is separated and
squeezed using a screw press to release the oil.
• Processing steps can be performed at almost any scale. 29
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VEGETABLE OIL
• Sources of vegetable oil.
– coconuts (left) .
– sunflowers (right).
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BIODIESEL
• Diesel fuel based on vegetable
oil.
• Chemical process:
transesterification.
• Glycerine is separated with
alcohol from the vegetable oil.
• Can be blended with petroleum
diesel.
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PYROLYSIS BIO-OIL
• From residue chips and sawdust.
• Fast pyrolysis
– organic materials are rapidly heated to 450 - 600 oC in
absence of air organic vapours condensed to bio-oil.
• Chemically complex.
• Heating value 14-18 MJ/kg .32
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PYROLYSIS BIO-OIL
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GREEN BUS
NAGPUR’S ETHANOL GREEN SCANIA BUS SHOWCASED IN PUNE
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DRAWBACKS
• Expensive
• Transportation
• Low heating values
• Decaying
• Quality variations
• Some negative environmental impacts
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ADVANTAGES OF BIOENERGY
• Bio fuels are friendlier to the nature than fossil fuels.
• The fossil fuel reserves will decline biofuels’
importance rises
• Diversifying energy sources
• Employment
• Energy supply for developing countries
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AWARDS
Bio energy awards for cutting edge research (B-ACER).
IUSSTF –held by Indo-US Science and Technology
Forum.
EECA Awards 2016 – Innovation and outstanding
achievement in energy efficiency.
Stanford Borough Council Green Awards 2015.
IChemE –Bio processing Award 2013.
Bio energy Man of the year.
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EUBCE(European Biomass Conference and
Exhibition)
• EUBCE is a world class annual event which, since 1980,
is held at different venues throughout Europe .
• The EUBCE covers the entire value chain of biomass to
conduct business network and to present and discuss the
latest developments and innovations , the vision is to
educate the biomass community and to accelerate growth.
• In June 2015 , EUBCE was held in Stockholm, Sweden.
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BIOGAS DIGESTERS
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INTRODUCTION
• Biogas is clean environment friendly fuel (gas ) that can be obtained by
anaerobic digestion of animal residues and domestic and farm wastes,
abundantly available in the countryside.
• 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
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Acetate CH4 + CO2
CH4 H2 + CO2
Methanol CH4 + H2O
Hydrolysis Complex carbohydrates Simple sugarsComplex lipids Fatty acidsComplex proteinsAmino acids AcidogenesisSimple sugars + fatty acids + amino acids Organic acids, including acetate + alcohols Acetogenesis (acetate production)Organic acids + alcohols --------Acetate MethanogenesisAcetoclastic methanogeesis
Hydogenotrophic methanogenesis
Methyltrophic methanogenesis
BIOGAS PRODUCTION MECHANISM
Biogas production process is a multiple-stage process in which some main stages are:
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DIGESTER
• It is the underground cylindrical wall portion made of
bricks, sand and cement.
• It is this place where fermentation of dung takes
place.
• It is also some times called fermentation tank.
• Two rectangular openings facing each other are
provided for inflow and outflow at almost middle of
its height.
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ANAEROBIC DIGESTERS
• It is an air tight, oxygen free container that is fed an
organic material such as animal manure or food scraps.
• A biological process occurs to this mixture to produce
methane gas, commonly known as biogas along with an
odour reduced effluent.
• Microbes breakdown into biogas and nutrient-rich
effluent.
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TYPES OF DIGESTERS characteristics Covered lagoon Plug flow Complete mix Fixed film
Digestion vessel Deep lagoon Rectangular in ground
Round / square above / inground
Above ground tank
Level of technology
Low Low Medium Medium
Supplemental heat
No Yes Yes No
Total solids 0.5-3 % 11-13 % 3-10 % 3 %
Solid characteristics
Fine Coarse Coarse Fine
Retention time 40-60 days 15+ days 15+ days 2-3 days
Optimum climate Temp. & warm All All Temp. & warm
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BIOGAS PLANT
The basic biogas plants that are being mostly promoted in the country are
depend upon the design of the digester:
• Floating gas holder: Khadi and Village Industries Commission (KVIC)
type design for family, community, institutional and industrial biogas plants.
• Fixed dome design: Janata and Deenbandhu designs for family size
biogas plants.
• Upflow Anaerobic Sludge Blanket (UASB), design and other designs
for medium and large size plants for industrial, municipal and sewage waste
based biogas plants.
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Fixed dome design: Janata and Deenbandhu designs for family size biogas plants. Advantages:No moving parts, therefore no maintenance problem.Low operating and maintenance cost & longer working life.No corrosion problem.Amount of gas produced is higher than floatingDisadvantages:Required skilled masons for construction.Variable gas pressure.Problem of scum formation.Floating dome design: Indian Agricultural Research Institute (IARI) and Khadi & Village Industries Commission (KVIC) type design for family, community, institutional and industrial biogas plants.Advantages:Constant gas pressure and higher gas production.No problem of gas leakage.Scum problem is less.No danger of mixing between biogas and external air.Disadvantages:Heat is lost through gas holder.
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•Fig. Showing different types of common biogas reactors in India (a)Laboratory batch reactor, (b) Fixed dome Reactor, (c) Floating dome Reactor, (d) Continues stirrer tank reactor (CSTR), e) Plug Flow and, (f) Up flow anaerobic sludge blanket (UASB).
UP FLOW ANAEROBIC SLUDGE BLANKET (UASB):UASB design is used for medium and large size plants for industrial, municipal and sewage waste based biogas plants.UASB reactors are typically suited to dilute waste water streams (3% TSS with particle size >0.75mm
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KVIC Model Biogas Plant
05/02/2023 Digester is 3.5-6.5 m in depth and 1.2 to 1.6 m in diameter.
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05/02/2023 Development Alternative
Deenbandhu 2m3 model Family size biogas plant
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05/02/2023 Development Alternative
Medium-size KVIC model Biogas plant in village Bhicmudrak in Surat, Gujarat being used for supplying biogas through a piped network to about 120 households
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Materials Total Solid content (%) Water content (%) C/N Ratio
Dry rice straw 83 17 70
Dry wheat straw 82 18 90
Green grass 24 76 37
Human excrement 20 80 8
Pig excrement 18 82 18
Cattle excrement 17 83 24
Poultry waste 47 53 10
Water hyacinth 18 82 25
Pongamia deoiled
cake
92.5 7.5 8.7
Table . The total solid content and C/N ratio of some common organic materials .
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Some Mega Projects based on Biogas Technology in India:
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8.25MW biogas based Power Project in a Distillery at Banur, Dist. Patiala, Punjab
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12,000 m3 Biogas per day Biomethanation Project from Starch Industry Liquid Waste in Salem, Tamilnadu
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CONCLUSION
•A robust analysis of the resources and potential of biomass has been
presented.
•Huge potential exist for exploration of available biomass in India to
convert it to energy.
•Agencies and industries are practicing the conversion of different waste
biomass to energy in India and reported benefits from these.
•MNRE showed the huge potential data of installed capacity and surplus
biomass.
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CONTD.• Selection of conversion technologies for biomass depends upon the
form in which the energy is required like combustion produce heat,
mechanical, electricity energy; pyrolysis, fermentation and
mechanical extraction produce liquid fuels suitable for use as
transportation fuels etc.
• The states are also generating power by baggase cogeneration which
uses the waste of sugar mills.
• The prime motto of Govt. to provide the subsidy or providing
financial assistance is to encourage the use of non conventional
sources of energy, which helps in sustainable development of nation.
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“THE BEAUTY YOU SEE IN ME IS THE REFLECTION OF YOU”
RUMI
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