Slow pyrolysis is a process that can take several hours to days to complete.
This duration varies depending on the specific conditions and objectives of the process.
The lengthy duration is due to the low temperatures and slow biomass heating rates employed in slow pyrolysis.
These conditions facilitate the production of char and tar as primary products.
5 Key Factors to Consider
1. Heating Temperatures
In slow pyrolysis, the heating temperatures typically range from 0.1 to 2 °C per second.
The prevailing temperatures are around 500°C.
2. Gas Residence Time
The gas residence time may exceed five seconds.
This extended time allows for the biomass to be slowly devolatilized.
3. Biomass Residence Time
The biomass residence time can extend from minutes to days.
This extended residence time leads to the release of tar and char.
4. Repolymerization or Recombination Reactions
After the primary reactions, repolymerization or recombination reactions occur.
These reactions further contribute to the formation of char.
5. Particle Size of Feedstock
The efficiency and nature of the pyrolysis process are influenced by the particle size of the feedstock.
Most technologies require small particles (up to 2 mm) for effective heat transfer.
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