About biomass for power

ABOUT BIOMASS FOR POWER

SOURCES, CLASSIFICATION, CHARACTERISTICS, PROPERTIES, CRITERIA FOR CHOOSING TREE SPECIES

FOR ENERGY PLANTATIONS

BIOMASS CONVERSION METHODS

WOODY Agro AQUEOUS WASTE

IMPORTANCE OF ENERGY SOURCES

INCREASING POPULATION WITH

INCREASED PER CAPITA ENERGY CONSUMPTION

FOR

ELECTRICAL, TRANSPORT, INDUSTRIAL AND AGRICULTURAL ACTIVITIES

CONSTANTLY INCREASES DEMAND FOR ENERGY

INCREASED PER CAPITA ENERGY CONSUMPTION

AS POPULATION HAS INCRESAED RAPIDLY

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1965 - 2005

AT PRESENT, WE DEPEND MOSTLY

ON COAL, OIL AND NATURAL GAS (FOSSIL FUELS).

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At present, nuclear, wind and

hydro are the non-fossil fuel

sources of energy that

contribute to electricity

generation supplementing

coal, natural gas and oil.

Role of biomass in electricity Generation?

• At present, nuclear, wind and hydro are the non-fossil fuel sources of energy that contribute to electricity generation supplementing coal, natural gas and oil.

• Where cane sugar industry is thriving, with bagasse as fuel, electricity is produced along with process steam for the sugar industry.

• Contribution of biomass gasification with combined cycle or micro-gas turbine for power is yet to be fully established.

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The social, economic and environmental benefits of biomass

power are accepted for long term sustainability. The technologies

are progressively getting upgraded, attaining maturity, and

reaching commercialization. This is one of the renewable sources.

biomass

2002-2030

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Reference book Chapters

12 to15

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The Energy and Resources Institute (TERI)

Another Reference book: Chapter 4 & 5

Fundamentals of Renewable Energy Sources

By

G. N. Tiwari and M. K. Ghosal

Narosa Publishing House, N.D. 2007

Chapter 4: Biomass, Biofuels and Biogas

Chapter 5: Biopower

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Route From BIOMASS to ENERGY

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What does it take to produce energy from biomass?

• Input for producing biomass: Seed, Land with soil, water, N P K + minor nutrients, sunlight and manual + animal energy.

• How to Make it a usable Fuel: Biomass Residue from other uses maybe used as biofuel for combustion [heat-> Engine] or may be converted by preparatory methods into derived S/L/G biofuel

• End use conversion devices: Thermodynamic cycles, Stoves, kilns, furnaces, steam turbines, gas turbines, engines and electricity Generators.

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BIOMASS UTILIZATION

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Environment Impact Assessment scope

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A set of factors explain the slow growth on the

biomass utilization . They include:

1. High costs of production

2. Limited potential for production

3. Lack of sufficient data on energy

transformations coefficients.

4. Low energy efficiency

5. Health hazard in producing and using biomass.

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Biomass conversion technologies

A number of modern biomass conversion

technologies are now available, which allow for

conversion of biomass to modern energy forms

such as electricity or gaseous (biogas, producer

gas), liquid (ethanol, methanol), and solid

(briquette) fuels. Biomass conversion

technologies can help in meeting different types

of energy needs, particularly electricity. Key

technologies for power generation that have been

promoted in India are gasification, combustion,

cogeneration and biomethanation.

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What is Biomass? What are its sources and how are

they classified?

BIOMASS • Biomass is material derived from plant and

animal sources.

• Products of Forestry, Agriculture, Urban and Industrial Waste Disposables are sources of biomass that may be converted into biofuels.

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Sources of biomass

Primary:

• Forestry-Dense, Open;

• Social Forestry

• Agriculture,

• Animal Husbandry,

• Marine

Secondary:

• Industry,

• Municipal Waste

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Classification of biomass based on physicochemical properties:

• WOODY,

• NON-WOODY or AGRO RESIDUE (cultivated),

• WET [AQUEOUS] ORGANIC WASTE (effluents)

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Forests

Discuss forests as multifunctional natural resource that can also yield

woody biofuel.

Forest resource base-India

• 1 % of World's forests on 2.47 % of world's geographical area

• Sustaining 16 % of the world's population and 15 % of its livestock population

• Forest area cover—63.3 mill. hectares, is 19.2% of the total geographical area of India.

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Causes of tremendous pressure on Forest resource base

• Exponential rise in human and livestock population

• increasing demand on land allocation to alternative uses such as agriculture, pastures and development activities.

• Insufficient availability, poor purchasing power of people in rural areas for commercial fuels like kerosene & LPG drives poor people to use firewood inefficiently as a cooking fuel.

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• A minimum of 33 % of total land area under

forest or tree cover from present 19.2%

cover.

•Recognize the requirements of local people

for timber, firewood, fodder and other non-

timber forest produce-- as the first charge on

the forests,

• The need for forest conservation on the

broad principles of sustainability and

people’s participation.

The National Forest Policy

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15.5 m. ha of degraded forest land has natural root

stock available, which may regenerate given proper

management under the JFM

•Another 9.5 m. ha is partially degraded with some

natural rootstock, and another six m. ha is highly

degraded. These last two categories together

constitute another 15.5 m. ha, which requires

treatment through technology-based plantation of

fuel, fodder and timber species with substantial

investment and technological inputs.

Joint Forest Management system.

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• Fuelwood and fodder plantations to meet

the requirements of rural and urban

populations.

•Plantations of economically important

species (through use of high-yielding clones)

on refractory areas to meet the growing

timber requirement.

• Supplementing the incomes of the tribal

rural poor through management and

development of non-timber forest products.

The emphasis will be on:

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• Developing and promoting pasture on suitable

degraded areas.

• Promoting afforestation and development of

degraded forests by adopting, through micro-

planning, an integrated approach on a watershed

basis.

• Suitable policy initiatives on rationalization of tree

felling and transit rules, assured buy-back

arrangements between industries and tree

growers, technology extension, and incentives like

easy availability of institutional credit etc.

The emphasis will be on cont…

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To sum up, tropical India, with its adequate

sunlight, rainfall, land and labour,

is ideally suitable for tree plantations.

With the enhanced plan outlay for

forestry sector and financial support

from donor agencies, the country will

be able to march ahead towards the target

of 33 percent forest cover.

Forestry in the New Millenium:

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What are agro-forestry, ‘trees-outside-forests [T o F]’ and

Energy Plantation?

Other than Forests we have thinner sources of trees.

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Integrates trees with farming, such as lines

of trees with crops growing between them

(alley cropping), hedgerows, living fences,

windbreaks, pasture trees, woodlots, and

many other farming patterns.

Agro-forestry increases biodiversity,

supports wildlife, provides firewood,

fertilizer, forage, food and more, improves

the soil, improves the water, benefits the

farmers, benefits everyone.

Agro-forestry

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agroforestry - A dynamic, ecologically based

natural resources management system that,

through the integration of trees in farmland and

rangeland, diversifies and sustains production for

increased social, economic and environmental

benefits for land users at all levels. Agroforestry,

the intercropping of woody and non-woody plants,

although age-old in practice, has now established

itself as a new science.

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Energy Plantation: Growing trees for their fuel

value

• ‘Wasteland’-- not usable for agriculture and cash crops, useful for a social forestry activity

• A plantation that is designed or managed and operated to provide substantial amounts of usable fuel continuously throughout the year at a reasonable cost-- 'energy plantation'

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Criteria for energy plantation-1

• 'Wasteland‘--sufficient area, not usable for agriculture and cash crops, available for a social forestry activity

• Tree species favorable to climate and soil conditions

• Combination of harvest cycles and planting densities that will optimize the harvest of fuel and the operating cost--12000 to 24000 trees per hectare.

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Criteria for energy plantation-2

• Multipurpose tree species-fuel wood supply & improve soil condition

• Trees that are capable of growing in deforested areas with degraded soils, and withstand exposure to wind and drought

• Rapid growing legumes that fix atmospheric nitrogen to enrich soil

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Criteria for energy plantation-3

• Species that can be found in similar ecological zones

• Produce wood of high calorific value that burn without sparks or smoke

• Have other uses in addition to providing fuel -- multipurpose tree species most suited for bio-energy plantations or social forestry

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Give examples of trees suitable for Indian climatic zones

Fast growing nitrogen fixing trees that can withstand arid wasteland

Indian TREES / WOOD:

• Leucaena leucocephala (Subabul)

• Acacia nilotica (Babool)

• Casurina sp

• Derris indica (Pongam)

• Eucalyptus sp

• Sesbania sp

• Prosopis juliflora

• Azadiracta indica (Neem)

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Forage legume = vegetable,

• Regeneration of earthworm populations in a

degraded soil by natural and planted fallows under

humid tropical conditions

• Use of Leucaena leucocephala: Fodder,

fuelwood, erosion control, nitrogen fixation,

alley cropping, staking material

• Ntrogen fixation legume: Due to Leucaena

leucocephala crop wasteland is reclaimed

Leucaena leucocephala Crop Use:

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HYDROCARBON PLANTS, OIL PRODUCING SHRUBS:

• Hydrocarbon-- Euphorbia group

• & Euphorbia Lathyrus

• OIL Shrubs-- Euphorbia Tirucali

• Soyabean

• Sunflower

• Groundnut

• Jatropa

Discuss Properties & characteristics of

biomass

Wood – Agro residue – aqueous Waste

Properties of Solid Biomass :

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Chemical Composition of Solid Biomass :

• Total Ash %,

• Solvent soluble %,

• Water Soluble %,

• Lignin %,

• Cellulose %,

• Hemi-cellulose %

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Elemental Composition:

• Carbon

• Hydrogen

• Oxygen

• Nitrogen

• Sulphur

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Properties of Wet and Biodegradable biomass:

• C O D value

• B O D value

• Total dissolved solids

• Volatile solids

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What intervention is needed in traditional and primitive

rural utilization of biomass as fuel?

By overcoming poor purchasing power for LPG /Kerosene [to eliminate biofuel]

and investing in Energy Plantations

Make biofuel use economical and use efficient with new technology.

Problems in use of bio-fuels

Traditional biomass use is characterized by

• low efficiency of devices, scarcity of fuelwood, drudgery associated with the devices used,

• environmental degradation (such as forest degradation) and low quality of life.

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• In the twenty-first century, energy is not as it

always was.

• Yesterday’s world was entirely dependent on

biomass, particularly wood for heating and

cooking.

• A century ago biomass was eclipsed by fossil

fuels. Biomass is generally viewed with disfavor

as something associated with abject poverty.

• Yet there is another side to biomass; there is

now something of a resurgence going on. As

fossil fuel prices increase, biomass promises (?)

to play a more active role as a utility fuel, a motor

vehicle fuel, and a supplement to natural gas.

Rural India & ‘bio-energy’ • Before the advent of fossil fuels, energy needs for all activities

were met by renewable sources such as solar, biomass, wind, animal and human muscle power.

• In rural India, traditional renewables such as biomass and human and animal energy continue to contribute 80 % of the energy consumption [MNES, 2001].

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Share of bio-energy in primary energy consumption in India

In India, the share of bio-energy was estimated at

around 36 % to 46 % of the total primary energy

consumption in 1991 [Ravindranath and Hall, 1995], and has

come down to around 27 % in 1997 [Ravindranath et al.,

2000].For cooking, water heating and village industry,

use of firewood may have been substituted by LPG,

kerosene and diesel. Though availability has improved,

now prices are increasing. Improved cook stoves?

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Eliminate excess use of fuel wood as rural Heating and

cooking Fuel: Fuelwood accounts for 60% of the total fuel

in the rural areas. In urban areas, the consumption pattern

is changing fast due to increased availability of commercial

fuel (LPG, kerosene, and electricity). During 1983–1999, the

consumption of traditional fuel declined from 49% to 24%

and LPG connection to households increased from 10% to

44%. Developments in the petroleum sector facilitate the

availability of (subsidized) LPG and kerosene, the two most

important forms of energy preferred as substitutes for

fuelwood in households for cooking.

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Commercial fuel =

(LPG, kerosene, and

electricity).

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What are modern bioenergy technologies, barriers to their

development and what programmes are needed?

Biomass conversion to usable fuels and the end use devices are to be

developed and marketed

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India has over two decades of experience of implementing

bioenergy programmes. The Ministry of Non-conventional

Energy Sources (MNES or MNRE), the prime mover of the

programmes in India, has now responded with a

comprehensive renewable energy policy to give a

further fillip to the evolving sector. The need for climate

change mitigation provides an opportunity for promoting

the renewable energy (RE) sector. This calls for an

assessment of the policy barriers to the spread of

bioenergy technologies (BETs) in India.

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• The experience shows that despite several financial

incentives and favourable policy measures, the rate of

spread of BETs is low because of the existence of

institutional, technical, market and credit barriers.

• These barriers are by and large known, but what still

remains to be understood is the type and size of barriers

from the stakeholders’ perspective, which varies for a

given technology and the stakeholder.

• Policy options suggested to overcome such barriers

include:

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Bioenergy technologies : Remove Barriers:

(1) rational energy pricing: Explain the withdrawal of subsidy to Oil &

Gas products from economic & environmental point of view.

(2) Incentives for bioenergy to promote private sector participation,

(3) institutions to empower and enable community participation,

(4) financial support for large-scale demonstration programmes and for

focused research and development on bioenergy technologies

(BETs) for cost reduction and efficiency improvement, and finally,

(5) favourable land tenurial arrangements to promote sustained

biomass supply.

The global mechanisms for addressing climate change such as the

Clean Development Mechanism (CDM) and the Global Environment

Facility (GEF) provide additional incentives to promote BETs.

•Offer opportunities to conserve biomass

through efficiency improvements, and for

conversion to electricity and liquid and

gaseous fuels.

• Bio-energy technologies based on

sustained biomass supply are carbon

neutral and lead to net CO2 emission

reduction if used to substitute fossil fuels.

Modern Bio Energy Technologies

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Bio Energy Technologies and their products

How can biomass supplement coal as a feedstock for power

plants?

For decentralised small / medium scale power plants

Biomass Power Programmes are available

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Biomass energy is not necessarily the ‘poor man’s

fuel’, its role is rapidly changing for a combination of

environmental, energy, climatic, social and

economic reasons. It is increasingly becoming the

fuel of the environmentally-conscious, rich society.

The use of biomass energy has many pros and

cons. One of the major barriers confronting

renewable energy is that the conventional fuels do

not take into account the external costs of energy,

such as environmental costs.

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It is important to create a new situation in which all

sources of energy are put on a more ‘equal footing’.

For biomass energy, which has little or no

environmental costs, the internalisation of the cost

of energy could be a major determinant for its large-

scale implementation. This, together with

agricultural productivity and technological advances,

could be a key determinant in ensuring greater

competitiveness with fossil fuels.

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The Biomass Power Programme of India has reached the take off

stage, after dedicated and sustained efforts over the last decade.

The total potential is about 19,500 MW, including 3,500 MW of

exportable surplus power from bagasse-based co-generation in

sugar mills, and 16,000 MW of grid quality power from other

biomass resources.

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The Program could CONSISTS OF the following Components:

· Interest Subsidy for Bagasse/Biomass Co-generation projects,

including IPP mode projects;

· Interest Subsidy for Biomass Power Projects, including captive power

projects;

· Grants to MW-scale projects with 100% producer gas engines, and

Advanced Biomass Gasification projects;

· Promotion of Industrial Co-generation projects in core industry sector

for surplus power generation;

· Promotional Incentives for awareness creation, training and

preparation of Detailed Project Reports; and

· Grants for Biomass Resource Assessment Studies.

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BIOMASS INTEGRATED GASIFIER /GAS TURBINE (BIG/ GT) TECHNOLOGY

• HIGH THERMODYNAMIC CYCLE EFFICIENCY GAS TURBINES TECHNOLOGY IS MADE

AVAILABLE NOW AT REASONABLE COSTS LOW UNIT CAPITAL COST AT MODEST SCALES

FEASIBLE IT IS EXPECTED THAT THIS TECHNOLOGY

WILL BE COMMERCIALLY SUCCESSFUL IN THE NEXT TEN YEARS.

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Briquetting: Briquetting

improves the energy density of

loose biomass, which is either

charred and compacted or

directly compacted in the form

of briquettes.

Biomass briquettes made

through manual processes can

be used as cooking fuel in

homes. Briquettes produced

through mechanical processes

can be used in boilers and

furnaces.

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Fuel derived from compacting the biomass into

dense block is known as Briquette. It is cheaper

and requires no other raw material and produce

heat equivalent to other fuel. Now a days

biomass briquetting is used by the same

industries where the low-density biomass is

produced. Jute waste, groundnut shell, coffee

husk, coir pith and rice husk is used for

Briquetting.

What is Biomass Briquetting?

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biomass briquettes in Malawi.

• The briquette evaluation was made in terms of physical and chemical characteristics (like material content, size, weight, energy content), costs for the fuel and usability in household cooking stoves. The feasibility of the production method for each briquette type was also evaluated.

• The briquettes were compared with the characteristics of firewood and charcoal.

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Agro-residues and agro-industry residues-1

• Agricultural or agro-industrial biomass is

generally difficult to handle because of its

bulky and scattered nature, low thermal

efficiency and copious liberation of smoke

during burning. It will be useful to compress

them into manageable and compact pieces,

which have a high thermal value per unit

weight.

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Agro-residues and agro-industry residues-2

• Biomass residues and by products are

available in abundance at the agro processing

centres (rice husk, bagasse, molasses,

coconut shell, groundnut shell, maize cobs,

potato waste, coffee waste, whey), farms

(rice straw, cotton sticks, jute sticks).

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briquetting or pelleting

• The process is called

biomass briquetting or pelleting.

• Compressed biomass briquettes are usually cylindrical in shape with a diameter between 30 to 90 mm and length varying between 100 to 400mm.

• Briquetting consists of applying pressure to a mass of particles with or without a binder and converting it into compact aggregate. Ram type and screw type machinery are used for the manufacture of briquettes.

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Briquetting technology

• Ram type consists of a plunger or rod which forces the material received from a hopper into a die, which is not usually heated by external means.

• The screw type machine employs a screw auger which forces the material into a pipe heated by electricity.

• The choice of the type of machinery depends on many factors.

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Ram type [piston type] briquetting machine

• Ram type consists of a

plunger or rod which

forces the material

received from a hopper

into a die, which is not

usually heated by

external means.

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Ram type briquetting press

• Common in India, alternate to screw type.

• Material is compressed in horizontal press, made into a cylindrical continuous log; Cut to pellets later.

• Log diameter is 50 mm for a 500 kg per hour machine and 90 mm for a 1500 kg / hr machine

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Screw type briquetting machine

• The screw type machine

employs a screw auger

which forces the

material into a pipe

heated by electricity.

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Screw type briquetting Press

• The material is extruded under compression continuously in the form of a log, under screw.

• These logs are partially carbonized and free of volatile compounds.

• They can supplement charcoal / lignite as solid fuel for small scale uses.

• Wear of screw is a problem and designers of machine have solved this.

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PELLETISING

• Biomass material is compressed

through many holes by giving very high

pressure from rollers to the material.

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Preparing biomass for pellet making

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PELLETISING: High pressure, smaller size

• In pelletising, the biomass material

is compressed through many holes by giving very

high pressure from rollers to the material.

• The stick is continuous but the size of pellet is

smaller (6-25 mm in diameter) than briquettes.

• Pelletizing is more efficient and recognized as a

good method because of low investment.

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• Pelletizing, though introduced very recently, is

considered to be most wanted method due to its

high bulk density.

• Ring and Flat Die are two types found in this

category.

• The Ring die method is mostly used for making

animal feed, which has high bulk density.

• The flat die is used for low bulk density.

PELLETISING: Ring and Flat Die

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Liquid Fuels from Biomass

Ethanol & Biodiesel

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Liquid and gaseous transport fuels derived from a range of

biomass sources are technically feasible. They include

• methanol,

• ethanol,

• dimethyl esters,

• pyrolytic oil,

• Fischer- Tropsch gasoline and distillate and

• Biodiesel from (i) Jatropha , Pongamia pinnata, Salvadora

persica, Madhuca longifolia and

• ( ii) hydrocarbon from Euphorbia species.

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Sugar cane, like other plants, absorbs carbon dioxide from the

atmosphere during photosynthesis. Burning ethanol made from

sugar thus returns to the atmosphere what was recently there, rather

than adding carbon that was previously underground. Unfortunately,

turning sugar cane into ethanol uses more energy, and thus causes

more greenhouse-gas emission, than making petrol from crude oil.

Nevertheless, says Lew Fulton of the International Energy Agency, a

sister body of the OECD, studies suggest that Brazil's present

method of making ethanol fuel from sugar leads to net savings of

about 50% in greenhouse-gas emissions per kilometre travelled,

compared with running cars on petrol.

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Name a recently published Reference book and point out the bioenergy related chapters in it.

See the next three slides

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Reference book Chapters 12 to15

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The Energy and Resources Institute

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The promotion of energy using biomass available

in form of natural waste such as agricultural

residue, sugarcane bagasse, banana stems,

organic effluents, cattle dung, night soil, fuelwood

and twigs holds considerable promise. A National

Programme on Biomass Power/Cogeneration was

launched to optimise the use of a variety of

forestry-based and agro-based residues for power

generation by the adoption of state-of-the-art

conversion technologies.

Reference book from T. E. R. I.

Chapters 12 to15

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SOME MORE BOOKS ON BIOENERGY

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