Thermochemical conversion methods include combustion, pyrolysis, gasification and liquefaction

1. Lecture 3
Thermochemical conversion of biomass
– combustion, gasification and pyrolysis
By Er. T. AYISHA NAZIBA, Dr. D. RAMESH, Dr.S. PUGALENDHI, Dept. of REE, AEC & RI, TNAU, Coimbatore-03

2. Thermochemical conversion
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3. 3
Biomass
Combustion Heat
Gasification Syngas
Pyrolysis
Syngas
Biochar
Bio-oil
Liquefaction Bio-oil

4. 4
Thermochemical
conversion of biomass
Biochemical conversion
of biomass

5. “
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6. Combustion
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3Ts
 Temperature
 Turbulence
 Time

7. 7
Pyrolysis
Pyrolysis
Slow
Temperature : 300-700°C
Heating rate : <1K/sec
Retention time: 2-5 h
Intermediate
Temperature: 600-725°C
Heating rate:1-200K/sec
Retention time: 10-60 sec
Fast/Flash
Temperature: 725-1000°C
Heating rate: 1000K/sec
Retention time : 1sec

8. Gasification

9. Types of gasifiers

11. Hydrothermal
process
WHITE BLACK
GRAY
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13. Overview
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Process Temperature,
°C
Pressure,
Mpa
Catalyst Drying
Liquefaction 250-310 5-20 Essential Not required
Pyrolysis 380-530 0.1-0.5 Not required Necessary
Combustion 700-1400 >0.1 Not required Not required
But may help
Gasification 500 -1300 >0.1 Not required Necessary

14. THANKS!
Any questions?
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