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Thermal decomposition behavior and sulfur release characteristics for torrefied wheat straw during pyrolysis process
Shuping Zhang1, Ganggang Min1, Yinhai Su2
1School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China.
Bioresource Technology
|April 24, 2021
Summary
Torrefaction pretreatment of wheat straw effectively reduces sulfur release during pyrolysis. This process enhances char properties, retaining more sulfur in the solid material for biomass conversion.
Area of Science:
- Biomass thermochemical conversion
- Chemical engineering
- Environmental science
Background:
- Sulfur (S) release during biomass pyrolysis is a critical concern for thermochemical conversion processes.
- Understanding S release mechanisms is essential for developing cleaner and more efficient biomass utilization technologies.
Purpose of the Study:
- To evaluate the thermal decomposition behavior and S release characteristics of wheat straw during torrefaction and pyrolysis.
- To investigate the impact of torrefaction pretreatment on S release during subsequent pyrolysis.
Main Methods:
- Wheat straw samples were subjected to torrefaction at varying temperatures.
- Subsequent pyrolysis of torrefied and raw wheat straw was performed.
- Sulfur release percentages and char properties were analyzed.
Main Results:
- Torrefaction increased S release percentage, linearly proportional to mass loss.
- Pyrolysis showed a rapid increase in S release up to 70.50% at 500°C, plateauing thereafter.
- Torrefaction pretreatment improved char pore properties, hindering S diffusion and retaining more S in the char.
Conclusions:
- Torrefaction pretreatment effectively inhibits S release into the gas phase during wheat straw pyrolysis.
- Pretreatment promotes sulfur retention in the char, offering a strategy for cleaner biomass conversion.
