Pyrolysis and fast pyrolysis are two distinct processes with different heating rates, residence times, and product outcomes. Understanding these differences is crucial for anyone involved in biomass processing or research.
5 Key Points to Know About Pyrolysis and Fast Pyrolysis
1. Heating Rates
Pyrolysis involves heating biomass at moderate temperatures, typically between 300-500°C.
Fast pyrolysis, on the other hand, increases the rate of pyrolysis temperature to 1000°C per second.
2. Residence Times
In pyrolysis, the biomass is heated for several hours.
Fast pyrolysis completes the process in just seconds.
3. Main Products
Pyrolysis primarily produces biochar, a type of charcoal.
Fast pyrolysis yields bio-oil as the main product.
4. Product Yields
Pyrolysis also produces valuable chemicals like acetone, methanol, and acetic acid.
Fast pyrolysis yields approximately 60-70% bio-oil, 15-25% bio-char, and 10-15% syngas.
5. Process Efficiency
Pyrolysis has a relatively low heating rate and a residence time of around 30 minutes.
Fast pyrolysis has a much higher heating rate and a residence time of around 5 seconds.
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