Effect of alkali and alkaline earth metals on agglomeration in biomass chemical looping gasification

IF 5.6 2区工程技术 Q2 ENERGY & FUELS

Journal of The Energy Institute Pub Date : 2024-08-31 DOI:10.1016/j.joei.2024.101815

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Abstract

By reasonably controlling the lattice oxygen of oxygen carrier (OC), the biomass chemical looping gasification (CLG) technology can convert biomass into syngas dominated by H₂ and CO, which is a prevalent topic in the world. However, in practical applications, the mechanism underlying OC agglomeration induced by alkali and alkaline earth metals (AAEMs), along with effective countermeasures, remain ambiguous. In this paper, AAEM elements were added to the biomass after pickling to explore the effects of K, Na, Ca, and Mg on agglomeration. The results indicated that with the increase of K and Na additions from 0.5 % to 18 %, the deformation temperature (DT) of spent OC decreased, leading to a marked intensification of agglomeration, with degree of agglomeration increases from 2.88 % and 1.74 % to 17.44 % and 13.91 %, respectively. In contrast, with the increase of Ca and Mg additions from 0.5 % to 18 %, the DT of spent OC increased, and the degree of agglomeration remained lower than that of K and Na, with values ranging only from 1.03 % and 0.95 % to 11.17 % and 2.66 %, respectively. Besides, with augmented alkali metal chloride addition, the amount of low melting point aluminosilicates formed from SiO₂ and Al₂O₃ increased, further exacerbating the OC agglomeration.

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碱金属和碱土金属对生物质化学循环气化过程中结块的影响

通过合理控制氧载体（OC）的晶格氧，生物质化学循环气化（CLG）技术可将生物质转化为以 H2 和 CO 为主要成分的合成气，这是目前世界上的一个热门话题。然而，在实际应用中，碱金属和碱土金属（AAEMs）诱导 OC 凝聚的机理和有效对策仍不明确。本文在酸洗后的生物质中添加了 AAEM 元素，以探讨 K、Na、Ca 和 Mg 对结块的影响。结果表明，随着 K 和 Na 添加量从 0.5 % 增加到 18 %，废 OC 的变形温度（DT）降低，导致团聚明显加剧，团聚度分别从 2.88 % 和 1.74 % 增加到 17.44 % 和 13.91 %。相反，随着 Ca 和 Mg 的添加量从 0.5 % 增加到 18 %，废 OC 的 DT 增加了，但聚结度仍然低于 K 和 Na，分别从 1.03 % 和 0.95 % 增加到 11.17 % 和 2.66 %。此外，随着碱金属氯化物添加量的增加，由 SiO2 和 Al2O3 形成的低熔点铝硅酸盐的数量也增加了，从而进一步加剧了 OC 的团聚。

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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.