Study on the comprehensive influence of Si-Al-based additives on hydrogen production and K deposition during biomass gasification

IF 5.6 2区工程技术 Q2 ENERGY & FUELS

Journal of The Energy Institute Pub Date : 2024-11-28 DOI:10.1016/j.joei.2024.101915

Zenghui Hou , Zefeng Ge , Lijuan Sun , Yang Liu , Huiyan Zhang

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Abstract

Green hydrogen production through gasification is a prospective utilization of biomass. Operational issues (slagging, corrosion and catalyst poisoning) due to inherent alkali metal deposition are main factors affecting gasification. The adoption of Si-Al-based additives as alkali metal inhibitors is a promising approach. In this work, the influence of additive types and placement methods on K deposition and gasification characteristics were studied through a decoupled gasification with online analysis. As a result, separative placement (Sep) method could reduce K deposition without decreasing hydrogen yield compared to mechanical mixture (Mix) method. This advantage is particularly prominent in char gasification. SiO₂ is recommended to be added by the Mix to react with alkali and alkaline earth metal species individually to inhibit K release. This match could reduce peak of K deposition content by 55.80 % with less impact on hydrogen yield. Meanwhile, Al₂O₃ is recommended to be added by the Sep due to its unique comprehensive performance, which could increase hydrogen yield by 4.34 % and reduce peak of K deposition content by 52.72 %. Two recommended addition strategies could be used in different scenarios. This study is expected to guide the design of corrosion-resistant reactors and multifunctional catalysts.

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硅铝基添加剂对生物质气化产氢和钾沉积的综合影响研究

绿色气化制氢是生物质的一种有前景的利用方式。由于固有碱金属沉积引起的操作问题（结渣、腐蚀和催化剂中毒）是影响气化的主要因素。采用硅铝基添加剂作为碱金属抑制剂是一种很有前途的方法。通过解耦在线气化分析，研究了添加剂类型和放置方式对K沉积和气化特性的影响。结果表明，与机械混合（Mix）方法相比，分离放置（Sep）方法可以在不降低氢产率的情况下减少K沉积。这一优势在炭气化中尤为突出。建议在混合料中加入SiO2，分别与碱土金属和碱土金属发生反应，抑制K的释放。该配型可使K沉积峰含量降低55.80%，对产氢率的影响较小。同时，由于Al2O3具有独特的综合性能，Sep推荐添加Al2O3，可使产氢率提高4.34%，使K沉积峰含量降低52.72%。在不同的场景中可以使用两种推荐的加法策略。该研究对耐腐蚀反应器和多功能催化剂的设计具有指导意义。

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来源期刊

Journal of The Energy Institute 工程技术-能源与燃料

CiteScore

10.60

自引率

5.30%

发文量

166

审稿时长

16 days

期刊介绍： The Journal of the Energy Institute provides peer reviewed coverage of original high quality research on energy, engineering and technology.The coverage is broad and the main areas of interest include: Combustion engineering and associated technologies; process heating; power generation; engines and propulsion; emissions and environmental pollution control; clean coal technologies; carbon abatement technologies Emissions and environmental pollution control; safety and hazards; Clean coal technologies; carbon abatement technologies, including carbon capture and storage, CCS; Petroleum engineering and fuel quality, including storage and transport Alternative energy sources; biomass utilisation and biomass conversion technologies; energy from waste, incineration and recycling Energy conversion, energy recovery and energy efficiency; space heating, fuel cells, heat pumps and cooling systems Energy storage The journal''s coverage reflects changes in energy technology that result from the transition to more efficient energy production and end use together with reduced carbon emission.