Numerical simulation of lignin gasification: The role of gasifying agents in entrained-flow reactors

IF 5.1 3区 工程技术 Q2 ENERGY & FUELS
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引用次数: 0

Abstract

Biomass gasification using an Entrained-Flow Reactor (EFR) is an effective strategy for sustainable energy production and climate change mitigation. However, optimizing gasification efficiency and syngas quality requires a thorough understanding of the influence of gasifying agents. This study investigates the effects of different gasifying agents—air, CO2, steam, and CO2-steam mixtures—on lignin gasification in an EFR. Utilizing a validated Eulerian-Lagrangian Computational Particle Fluid Dynamics (CPFD) model, we examine how these agents impact biomass conversion to syngas, focusing on key parameters like hydrogen to carbon monoxide ratio, and the lower heating value (LHV) of syngas. Our findings reveal that air, due to nitrogen dilution, results in suboptimal lignin-to-syngas conversion, yielding lower energy content and hydrogen production. In contrast, steam enhances conversion efficiency, significantly increasing hydrogen output and LHV. CO2 as a gasifying agent boosts carbon monoxide levels through interactions with solid carbon, leading to a higher energy content in the syngas. The CO2-steam mixture is particularly effective, producing syngas with a high hydrogen concentration, primarily due to the water–gas shift reaction and steam’s reaction with the lignin carbon. This research addresses the limitations of existing studies by providing detailed, quantitative insights into the impact of gasifying agents on lignin gasification in an EFR. By adjusting the CO2-to-steam ratio, operators can precisely control the composition of syngas for targeted applications such as Fischer-Tropsch synthesis, methanol production, and fermentation. The study highlights the potential of advanced simulation techniques to optimize biomass gasification processes, offering significant improvements in efficiency and energy yield over current methods.

木质素气化的数值模拟:气化剂在内流式反应器中的作用
使用内流式反应器(EFR)进行生物质气化是可持续能源生产和减缓气候变化的有效策略。然而,要优化气化效率和合成气质量,就必须充分了解气化剂的影响。本研究探讨了不同气化剂--空气、二氧化碳、蒸汽和二氧化碳-蒸汽混合物--对 EFR 中木质素气化的影响。利用经过验证的欧拉-拉格朗日计算粒子流体动力学(CPFD)模型,我们研究了这些气化剂如何影响生物质转化为合成气,重点是氢气与一氧化碳的比率以及合成气的较低热值(LHV)等关键参数。我们的研究结果表明,由于氮稀释作用,空气会导致木质素到合成气的转化效果不理想,从而降低能量含量和氢气产量。相比之下,蒸汽可提高转化效率,显著增加氢气产量和 LHV。二氧化碳作为气化剂,可通过与固体碳的相互作用提高一氧化碳含量,从而提高合成气中的能量含量。二氧化碳-蒸汽混合物尤其有效,主要由于水气变换反应和蒸汽与木质素碳的反应,产生了高氢气浓度的合成气。本研究针对现有研究的局限性,就气化剂对 EFR 中木质素气化的影响提供了详细的定量见解。通过调整二氧化碳与蒸汽的比例,操作人员可以精确控制合成气的成分,以实现费托合成、甲醇生产和发酵等目标应用。这项研究强调了先进模拟技术在优化生物质气化工艺方面的潜力,与目前的方法相比,它能显著提高效率和能源产量。
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来源期刊
Thermal Science and Engineering Progress
Thermal Science and Engineering Progress Chemical Engineering-Fluid Flow and Transfer Processes
CiteScore
7.20
自引率
10.40%
发文量
327
审稿时长
41 days
期刊介绍: Thermal Science and Engineering Progress (TSEP) publishes original, high-quality research articles that span activities ranging from fundamental scientific research and discussion of the more controversial thermodynamic theories, to developments in thermal engineering that are in many instances examples of the way scientists and engineers are addressing the challenges facing a growing population – smart cities and global warming – maximising thermodynamic efficiencies and minimising all heat losses. It is intended that these will be of current relevance and interest to industry, academia and other practitioners. It is evident that many specialised journals in thermal and, to some extent, in fluid disciplines tend to focus on topics that can be classified as fundamental in nature, or are ‘applied’ and near-market. Thermal Science and Engineering Progress will bridge the gap between these two areas, allowing authors to make an easy choice, should they or a journal editor feel that their papers are ‘out of scope’ when considering other journals. The range of topics covered by Thermal Science and Engineering Progress addresses the rapid rate of development being made in thermal transfer processes as they affect traditional fields, and important growth in the topical research areas of aerospace, thermal biological and medical systems, electronics and nano-technologies, renewable energy systems, food production (including agriculture), and the need to minimise man-made thermal impacts on climate change. Review articles on appropriate topics for TSEP are encouraged, although until TSEP is fully established, these will be limited in number. Before submitting such articles, please contact one of the Editors, or a member of the Editorial Advisory Board with an outline of your proposal and your expertise in the area of your review.
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