Pyrolysis is a process of thermal decomposition of carbonaceous materials.
There are different types of pyrolysis, but two of the most common are flash pyrolysis and fast pyrolysis.
These methods differ in several key aspects, which we will explore in detail.
4 Key Differences Between Flash Pyrolysis and Fast Pyrolysis
1. Heating Rates
Flash pyrolysis occurs at very high heating rates, typically greater than 1000°C per second.
Fast pyrolysis, on the other hand, is conducted at heating rates ranging from 10 to 300°C per second.
2. Temperatures
Flash pyrolysis operates at moderate temperatures, usually between 400-600 °C.
Fast pyrolysis involves higher temperatures, ranging from 650 to 1000 °C.
3. Residence Times
The vapor residence time in flash pyrolysis is very short, less than 2 seconds.
In fast pyrolysis, the residence time is around 5 seconds.
4. Product Yields
Flash pyrolysis produces high amounts of bio-oil, with yields up to 75-80 wt%.
Fast pyrolysis maximizes the production of gases and oil, with liquid condensate yields ranging from 30-60%.
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