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<p>Biomass fluidized bed gasification is valued for its superior mass and heat transfer efficiency and feedstock versatility, garnering increasing attention. In this work, the FluidBed reactor block in Aspen Plus was employed to simulate the biomass fluidized bed gasification process, integrating reaction kinetics, reactor geometry, and hydrodynamics. The model also considers tar formation. Sensitivity studies were conducted to investigate the impacts of fluidized bed parameters on the solids profile and flow patterns, as well as process variables such as equivalence ratios (ER), steam/biomass ratio (S/B), and solids circulation ratio (CR) on gasification performance. The cold model simulation revealed that the solid volume fraction in the dense bed decreases, and the solid profile along the bed height becomes more gradual with increasing superficial velocity; for a reactor with intermediate constrictions (Type III), the aperture ratio of 36%–44% in the constriction section is a characteristic range that induces significant solids redistribution. Moreover, it was observed that ER = 0.3 and S/B = 1 at 800℃ represent a turning point corresponding to maximum H<sub>2</sub>/CO = 1.51; operation of circulating fluidized bed at an elevated superficial velocity of 11–12&#xa0;m/s results in turbulent fluidization of bed material and fast fluidization of carbon particles and ash; H₂/CO ratio shows a positive correlation with CR, peaking at 1.96 when CR = 9.6; naphthalene emerges as the predominant tar composition in T = 680–740&#xa0;°C, with a yield of 11.8–14.8&#xa0;g/kg biomass. The results presented in the current work serve as a reference for the optimization design of the biomass fluidized bed gasification configuration.</p>

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Simulation Analysis of Biomass Fluidized Bed Gasification Process with FluidBed Reactor Model

  • 期刊论文

  • 发表日期：

    2025年10月29日

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  • Xiao Li,
  • Ruochen Liu,
  • Zejin Wu,
  • Mingxi Zhou,
  • Shuang Ye,
  • Weiguang Huang

摘要

Biomass fluidized bed gasification is valued for its superior mass and heat transfer efficiency and feedstock versatility, garnering increasing attention. In this work, the FluidBed reactor block in Aspen Plus was employed to simulate the biomass fluidized bed gasification process, integrating reaction kinetics, reactor geometry, and hydrodynamics. The model also considers tar formation. Sensitivity studies were conducted to investigate the impacts of fluidized bed parameters on the solids profile and flow patterns, as well as process variables such as equivalence ratios (ER), steam/biomass ratio (S/B), and solids circulation ratio (CR) on gasification performance. The cold model simulation revealed that the solid volume fraction in the dense bed decreases, and the solid profile along the bed height becomes more gradual with increasing superficial velocity; for a reactor with intermediate constrictions (Type III), the aperture ratio of 36%–44% in the constriction section is a characteristic range that induces significant solids redistribution. Moreover, it was observed that ER = 0.3 and S/B = 1 at 800℃ represent a turning point corresponding to maximum H2/CO = 1.51; operation of circulating fluidized bed at an elevated superficial velocity of 11–12 m/s results in turbulent fluidization of bed material and fast fluidization of carbon particles and ash; H₂/CO ratio shows a positive correlation with CR, peaking at 1.96 when CR = 9.6; naphthalene emerges as the predominant tar composition in T = 680–740 °C, with a yield of 11.8–14.8 g/kg biomass. The results presented in the current work serve as a reference for the optimization design of the biomass fluidized bed gasification configuration.