Multiparameter-based product, energy and exergy optimizations for biomass gasification

FUEL

卷:303

Article

Caglar, Basar¹  Tavsanci, Duygu²  Biyik, Emrah² 

[1] Izmir Inst Technol, Dept Energy Syst Engn, Fac Engn, TR-35430 Izmir, Turkey

[2] Yasar Univ, Dept Energy Syst Engn, Fac Engn, TR-35100 Izmir, Turkey

关键词: Biomass gasification;    Gibbs free energy minimization;    Exergy Efficiency;    Optimization;    CO(2 )conversion;   

DOI  :  10.1016/j.fuel.2021.121208

来源: Elsevier

【 摘 要 】

The thermodynamic modelling of biomass gasification was studied by using Gibbs free energy minimization approach. Different from the studies using the same approach, the simultaneous presence of all gasifying agents (air, H2O and CO2) was considered and a multiparameter optimization was applied to determine the synergetic effect of gasifying agents for hydrogen, syngas with a specific H2/CO ratio and methane production. The performance of gasification was assessed by using technical and environmental performance indicators such as product yields, cold gas efficiency, exergy efficiency, CO2 emission and the heat requirement of the gasifier. The results show that the simultaneous presence of gasifying agents does not create considerable changes in syngas yield, H2 yield, methane yield, CGE and exergy efficiency while it allows to tune the H2/CO ratio and the heat requirement of the gasifier. The highest syngas yield is observed at T > 1100 K and 1 bar and when SBR > 0.5 and/or CBR > 0.8 with the absence of air, at which CGE changes between 114% and 122% while exergy efficiency is between 77% and 86%. The results prove that CO2 offers several advantages as a gasifying agent and suggests that CO2 recycling from gasifier outlet is a useful option for the biomass gasification.

【 授权许可】

Free