lecture 11 biomass iii
DESCRIPTION
Presentación para clase de energías renovables. Biomasa.TRANSCRIPT
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RENEWABLE ENERGIES
2023284
Period: 2011-1I
Biomass III
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Course Schedule
Introduction
Densification Fundamentals
Market data
Manufacture process
Energy from pellets
Environmental assessment
Renewable Energy .- Thermodynamics I. Carlos Andrs Forero. Sept 2011
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Introduction
Why do we use biomass for energy
production???
What are some problems related with
biomass use???
Renewable Energy .- Thermodynamics I. Carlos Andrs Forero. Sept 2011
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Introduction
Biomass has so many benefits related with:
GHG Emissions reduction
Energy supply security
Small scale power systems
Biomass has problems in terms of:
Storage
Transportation
Transformation
Low efficient processes
Renewable Energy .- Thermodynamics I. Carlos Andrs Forero. Sept 2011
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Fundamentals
Densification of biomass is a process of
reducing the bulk volume of the material
by mechanical means.
Final products are called pellets or
briquettes
Renewable Energy .- Thermodynamics I. Carlos Andrs Forero. Sept 2011
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Fundamentals
Pellets and briquettes are high density biomass
products, with low moisture content which
could be distinguished by their dimensions
Renewable Energy .- Thermodynamics I. Carlos Andrs Forero. Sept 2011
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Fundamentals
Pellets are cylindrical solids which diameter is about 5 10 mm and length about 8 29 mm
Briquettes are cylindrical solids which diameter varies between 40 to 90 mm and the length is between 74 to 300 mm
Advantages: Ease of handling and storage Improve biomass stability Facilitates the feeding of solid biomass fuels to
furnaces
Clean burning High energy density
Renewable Energy .- Thermodynamics I. Carlos Andrs Forero. Sept 2011
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Fundamentals
Volume required to substitute one cubic
meter of oil by some other fuels
Renewable Energy .- Thermodynamics I. Carlos Andrs Forero. Sept 2011
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Fundamentals
Most of pellets and briquettes are produced from wood, but there are new raw material such as agricultural or coal residues, these solid biofuels are called Mixed Biomass Pellets
Wheat straw, barley straw, corn stover
Swtichgrass
Alfalfa
Palm oil
Rice straw, rice bran
Renewable Energy .- Thermodynamics I. Carlos Andrs Forero. Sept 2011
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Fundamentals
There are no standardized quality
parameters but some countries define
particular norms.
norm M1735 (Austria)
DIN 51731 (Sweden)
SS 187120 (Germany)
CEN/TS 14961:2005
Renewable Energy .- Thermodynamics I. Carlos Andrs Forero. Sept 2011
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Fundamentals
Basic specifications
Renewable Energy .- Thermodynamics I. Carlos Andrs Forero. March 2011
11 Source: European pellet center
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Market data
Wood pellets consumption have increased the
last 5 years more than 200%
Renewable Energy .- Thermodynamics I. Carlos Andrs Forero. Sept 2011
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Market Data
Europe
Prod. 7 mill
Con. 8 mill
Renewable Energy .- Thermodynamics I. Carlos Andrs Forero. Sept 2011
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Market Data
Rest of the world
Renewable Energy .- Thermodynamics I. Carlos Andrs Forero. Sept 2011
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Market Data
Why do you think European countries consume
and produce most of the wood pellets???
Do they have enough biomass potential???
Renewable Energy .- Thermodynamics I. Carlos Andrs Forero. Sept 2011
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Manufacture process
General wood pellet process
Renewable Energy .- Thermodynamics I. Carlos Andrs Forero. Sept 2011
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Manufacture process
More detailed process
Renewable Energy .- Thermodynamics I. Carlos Andrs Forero. Sept 2011
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Manufacture process
Plant Lay out
Renewable Energy .- Thermodynamics I. Carlos Andrs Forero. March 2011
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Manufacture process
Renewable Energy .- Thermodynamics I. Carlos Andrs Forero. Sept 2011
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Cleansing:
After drying several impurities could be mixed with biomass
such as metals; therefore they must be removed using
magnets and screens
Grinding:
The size of the biomass must be homogeneous, typically size
is below 5 mm
Pressing:
Raw material raw lies in a layer in front of a rolling press,
which presses the material down into the die block.
1 or 2% of steam is injected before the biomass goes into
the pelletising machine
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Manufacture process
Renewable Energy .- Thermodynamics I. Carlos Andrs Forero. Sept 2011
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Pelletising machine with ring die block.
Diagram of the plane type die block
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Manufacture process
Renewable Energy .- Thermodynamics I. Carlos Andrs Forero. Sept 2011
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Parameters:
- Pressure
- Temperature
- Moisture
- Particle size
- Fibers
- Proteins
- Starch
- Lignin
- Oil and wax
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Manufacture process
Renewable Energy .- Thermodynamics I. Carlos Andrs Forero. Sept 2011
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SEM (Beech at 25 and 100C)
Source: Stelte,
Biomass and Bioenergy 35 910 - 918
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Manufacture process
Renewable Energy .- Thermodynamics I. Carlos Andrs Forero. Sept 2011
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UV-AF microscopy
(corn stover before and after)
Lignin: brilliant blue, bluish white
Proteins: green or yellow green
Carbohydrates: black
Source: Kaliyan, Bioresource
Technology 101 1082 - 1090
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Energy from Pellets
We could use pellets either for electricity
production or thermal energy generation
Renewable Energy .- Thermodynamics I. Carlos Andrs Forero. Sept 2011
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Energy from pellets
Bulk power
Renewable Energy .- Thermodynamics I. Carlos Andrs Forero. Sept 2011
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Long term contracts
needed
Especially used at
co-firing plants
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Energy from pellets
District heating
Renewable Energy .- Thermodynamics I. Carlos Andrs Forero. Sept 2011
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Energy from pellets
Residential heating
Renewable Energy .- Thermodynamics I. Carlos Andrs Forero. Sept 2011
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Energy from pellets
Residential Heating
Renewable Energy .- Thermodynamics I. Carlos Andrs Forero. Sept 2011
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Small bags: max 25 kg
Big Bags of up to 1200 kg
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Energy from pellets
Electricity production
There is not any medium scale power plant which operates only with biomass pellets.
Avedore (300.000 tonnes/year)
Renewable Energy .- Thermodynamics I. Carlos Andrs Forero. Sept 2011
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Energy from pellets
Pellet stoves for residential heating
Renewable Energy .- Thermodynamics I. Carlos Andrs Forero. Sept 2011
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Energy from pellets
Residential Heating
Renewable Energy .- Thermodynamics I. Carlos Andrs Forero. Sept 2011
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Environmental assessment
Energy consumption at the procurement
and use of wood pellets
Renewable Energy .- Thermodynamics I. Carlos Andrs Forero. Sept 2011
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Environmental assessment
Energy consumption of other fuels
Renewable Energy .- Thermodynamics I. Carlos Andrs Forero. Sept 2011
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Fuel Energy consumption
MJ/tonne % of energy content
Native wood
pellets 627 3,6
Imported wood
pellets 787 4,5
Natural Gas 2840 5,8
Oil 4617 11,4
Coal 1764 6,7
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Environmental assessment
GHG Emissions
Renewable Energy .- Thermodynamics I. Carlos Andrs Forero. Sept 2011
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Environmental assessment
GHG Emissions compared with other
fuels
Renewable Energy .- Thermodynamics I. Carlos Andrs Forero. Sept 2011
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Fuel
Substance
Wood
pellets
Straw Fuel Oil Natural
Gas
CO2 g/MJ 0,108 0,108 0,972 0,72
SO2 g/MJ 0 13 94 0,5
CO mg/MJ 50-3000 500-3000 15-30 15-20
NOx mg/MJ 130 - 300 130 - 300 75 50 - 100
TOC mg/MJ