Gunarathne.pdf

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HIGH TEMPERATURE AIR/STEAM GASIFICATION OF
STEAM EXPLODED BIOMASS
Duleeka Sandamali Gunarathne
Jan Karol Chmielewski (PhD)
Weihong Yang (PhD)
Tel: + 4687908402
Royal Institute of Technology (KTH)
School of Industrial Engineering and Management
Department of Materials and Science Engineering
Division of Energy and Furnace Technology
Stockholm, Sweden
Energy- and Furnace Technology
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Presentation schedule
• Introduction to biomass pretreatment
• Opening possibilities
• Background
• Objective of present work
• Methodology: The system and the fuel
• Gasification performance
• Insight into behaviour of tar
• Conclusions
Energy- and Furnace Technology
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Biomass pretreatment
• Mechanical pretreatment
• Torrefaction
• HTC
• Steam explosion
– heating biomass under high pressure steam
– sudden release of pressure assuring explosive decompression
– Typical conditions:
• Pressure: 1.2-1.7 MPa
• Temperature: 170-250 o C
• Time: 10sec-10min
– limited energy consumption
– low use of chemicals
Energy- and Furnace Technology
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Opening possibilities
Structural change
Effect
Ultimate result
Opening
possibilities
Hemicellulose &
cellulose de-
polymerization
Low thermal stability 1-5
Early thermal degradation
+
Low temperature
operations possible
Altered lignin
structure
Release of minerals
Low alkali metal content and low ash
content
High ash fusion temperature
+
High temperature
operations possible
Less reactive
-
Need longer bed
(high H/D ratio)
Release of
hemicellulose to
solution
Low hemicellulose
content
Reduced volatiles
Less hydroxyl
groups 3
Hydrophobic
+
Transportation and
storage easiness
Less amorphous
structures (High
crystallinity) 6
Heat diffusion limitations 7
-
High temperature
operation suitable
Reduced O content
Low O/C and H/C (moving close
to peat region)
+
Co-gasification
possible
High lignin
content
High C content
High heating
value
High energy
density
+
Positive in
transportation and
storage
Disintegration of
biomass
Fine particles
High pellet density
High bulk
density
+
Compact reactor
High impact and
abrasive resistance 8
Higher durability
+
Handling easiness
Energy- and Furnace Technology
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Background
• Mostly focus on ultimate use as
fermentation to ethanol
• Several studies based on combustion of
fermentation residue
• Some studies on thermochemical behaviour
• Thermal application is lacking
Energy- and Furnace Technology
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