Investigating the pyrolysis of large biomass particle streams in CO2/H2O atmosphere at high heating rates: A modeling approach
发布时间：2025-10-16
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- 发布时间：
- 2025-10-16
- 论文名称：
- Investigating the pyrolysis of large biomass particle streams in CO2/H2O atmosphere at high heating rates: A modeling approach
- 发表刊物：
- FUEL
- 摘要：
- Computational fluid dynamics modeling has been widely applied in fuel thermo-chemical conversion processes, while the isothermal assumption has conventionally been employed for updating particle temperature. A user-defined discrete phase model is developed to simulate the pyrolysis of thermal-thick biomass particles in high concentrations of CO2 and H2O, a process that remains not yet fully understood especially at high heating rates. In an Eulerian-Lagrangian scheme, the biomass particle group is tracked throughout its motion. Specifically, single particle tracking is realized by post-processing technology to reveal the particle heat transfer and conversion behaviors. Results demonstrate that the developed model can effectively predict the temperature gradient inside the biomass particles over residence time, while the temperature and devolatilization rate of thermally thick biomass particles are significantly overestimated when the isothermal model is coupled. No significant computational cost is found after switching the isothermal model to the thermal-thick model. As the pyrolysis temperature increases, a notable rise in the cumulative heat flux is observed from both convection and radiation to the particle surface. The char gasification products become non-negligible when the pyrolysis temperature exceeds 1300 K. Compared to the gasification pathway of char-CO2 reaction, the char-H2O reaction rate is higher at lower temperatures. Given the limited char gasification during volatile release, for large biomass particles, the volatile release and char gasification stages can be regarded as sequential processes. The developed model has the potential to be integrated into simulations of oxy-fuel combustion and gasification processes in industrial-scale facilities.
- 合写作者：
- Zhang Jiaye, Li Xiangdong, Lin Hui, Heberlein Stephan, Chan Wei Ping, Wang Xuebin, Tan Houzhang, Lisak Grzegorz
- 卷号：
- 392
- 是否译文：
- 否
- 发表时间：
- 2025-07-15