The pyrolysis rate refers to the speed at which thermal decomposition occurs in the pyrolysis process.
Pyrolysis is a method of chemically decomposing organic materials at elevated temperatures in the absence of oxygen.
This rate is influenced by several factors, including the heating rate, temperature, and residence time of the biomass.
What is Pyrolysis Rate? 3 Key Factors Explained
1. Heating Rate
The heating rate is the speed at which the temperature of the biomass is increased during pyrolysis.
In ultra-fast pyrolysis, the heating rate is extremely high, ranging from 100 to 10,000° C/s.
This high heating rate leads to rapid thermal decomposition and quick production of gases and bio-oil.
In contrast, slow pyrolysis has a much lower heating rate, typically ranging from 0.1 to 2 °C per second.
2. Temperature
The temperature at which pyrolysis occurs significantly affects the rate and products of the process.
Pyrolysis typically requires temperatures of up to 400–550°C.
Higher temperatures generally lead to faster pyrolysis rates and a greater production of gases.
Lower temperatures favor the production of biochar.
3. Residence Time
Residence time refers to the duration that the biomass remains in the reactor at pyrolysis temperatures.
In ultra-fast pyrolysis, residence times are very short, which contributes to the rapid production of gases and bio-oil.
Conversely, slow pyrolysis involves longer residence times, sometimes ranging from minutes to days.
This allows for more gradual devolatilization and the production of tar and char.
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