Aspen Simulation Study of Dual-Fluidized Bed Biomass Gasification

Jida Zhang and Liguo Yang ()
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Jida Zhang: China Coal (Tianjin) Underground Engineering Intelligent Research Institute Co., Ltd., Tianjin 300131, China
Liguo Yang: Energy Research Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China

Energies, 2024, vol. 17, issue 10, 1-21

Abstract: This article establishes a thermodynamic model of a dual-fluidized bed biomass gasification process based on the Aspen Plus software platform and studies the operational control characteristics of the dual-fluidized bed. Firstly, the reliability of the model is verified by comparing it with the existing experimental data, and then the influence of different process parameters on the operation and gasification characteristics of the dual-fluidized bed system is investigated. The main parameters studied in the operational process include the fuel feed rate, steam/biomass ratio (S/B), air equivalent ratio (ER), and circulating bed material amount, etc. Their influence on the gasification product composition, reactor temperature, gas heat value (Q V ), gas production rate (G V ), carbon conversion rate (η c ), and gasification efficiency (η) is investigated. The study finds that fuel feed rate and circulating bed material amount are positively correlated with Q V , η c , and η; ER is positively correlated with G V and η c but negatively correlated with Q V and η; S/B is positively correlated with G V , η c , and η but negatively correlated with Q V . The addition of CaO is beneficial for increasing Q V . In actual operation, a lower reaction temperature in the gasification bed can be achieved by reducing the circulating bed material amount, and a larger temperature difference between the combustion furnace and the gasification furnace helps to further improve the quality of the gas. At the same time, G V , η c , and η need to be considered to find the most optimized operating conditions for maximizing the benefits. The model simulation results agree well with the experimental data, providing a reference for the operation and design of dual-fluidized beds and chemical looping technology based on dual-fluidized beds.

Keywords: gasification; herb residues; dual-fluidized bed; Aspen simulation; chemical looping (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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