The temperature of a pyrolysis reactor can vary significantly depending on the specific type of pyrolysis process being used.
What is the Temperature of a Pyrolysis Reactor? 5 Key Factors to Consider
1. Flash Pyrolysis
For flash pyrolysis, the temperature range inside the reactor is typically between 475 and 550 °C (887 and 1022 °F).
This process occurs at rapid heating rates and moderate temperatures between 400 and 600 °C (752 and 1112 °F).
Flash pyrolysis has a vapor residence time of less than 2 seconds and produces less gas and tar compared to slow pyrolysis.
2. Fast Pyrolysis
In fast pyrolysis, biomass is rapidly heated to temperatures of 650 to 1000 °C (1202 to 1832 °F).
This process is primarily used to produce bio-oil and gas, depending on the desired amount of bio-oil or gas products.
During fast pyrolysis, char accumulates in large quantities and needs to be removed frequently.
3. Slow Pyrolysis
Slow pyrolysis is characterized by lengthy solids and gas residence times, low temperatures, and slow biomass heating rates.
The heating temperatures in slow pyrolysis typically range from 0.1 to 2 °C (32.18 to 35.6 °F) per second.
Prevailing temperatures in slow pyrolysis are around 500 °C (932 °F).
The residence time of gas can be over five seconds, and that of biomass can range from minutes to days.
4. High-Quality Biochars
To produce high-quality biochars intended for agricultural use, slow pyrolysis is often considered the most feasible production process.
In slow pyrolysis, the biomass is heated in an oxygen-limited or oxygen-free environment.
Typical heating rates in slow pyrolysis are between 1 and 30 °C min−1.
The process is usually carried out at atmospheric pressure.
The highest treatment temperature (HTT) in the pyrolysis reactor has the greatest overall influence on the final product characteristics.
5. Temperature Range
In summary, the temperature of a pyrolysis reactor can range from 400 to 1000 °C (752 to 1832 °F) depending on the specific pyrolysis process being used.
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