高效利用高CO2垃圾填埋气体合成气:多孔介质反应器超富燃烧路径CFD模拟研究

IF 7.2 2区 工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY
Mohammadreza Mohammadpour , Amirreza Mohammadpour , Mehdi Ashjaee , Ehsan Houshfar
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引用次数: 0

摘要

低热值垃圾填埋气的成分中含有大量的CO2,本研究探索利用纯O2富燃烧提取合成气的可能性,作为CO2利用的有效策略。结果表明,混合速度的提高使合成气能量转换效率从36.9 %显著提高到44.14 %。此外,还观察到H2产率在当量比为2.2时达到最大值,随后下降,直到研究区间结束。在混合速度为25 cm/s时,CH4和CO2转化率最高,分别达到89.02 %和42.85 %,合成气生产效率最高。此外,当当量比为1.6时,在含有70 % CH4的燃料混合物中,CO的最高可达合成气成分为0.3277,H2为0.2841,CH4为0.0676,CO2为0.2534,这表明合成气生产的有利条件。反应途径分析表明,H自由基对烃类的吸氢反应主要通过CH4直接转化为H2的途径进行,而烃类的重组途径在垃圾填埋气制氢过程中起着关键作用。此外,对于CO2含量较高的垃圾填埋气,直接CO2到CO还原路线是决定性的。反之,当垃圾填埋气CH4含量较高时,在不同的混合物当量比下,烃类重组、烯基自由基形成和分解为CO是主要途径。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Efficient utilization of high CO2 landfill-gas for syngas generation: Ultra-rich combustion pathways study in porous media reactor via CFD simulation
The current investigation explores the possibility of extracting syngas from low-calorific value landfill-gas rich-combustion with pure O2, which contains a considerable amount of CO2 in its composition as an effective strategy in CO2 utilization. The results illustrate that enhancement in mixture velocity leads to a notable increment in syngas energy conversion efficiency from 36.9 % to 44.14 %. Furthermore, it was observed that the maximum rate of H2 production occurs at an equivalence ratio of 2.2, followed by a subsequent decrease until the end of the studied interval. At a mixture velocity of 25 cm/s, CH4 and CO2 conversion ratios reach a maximum of 89.02 % and 42.85 %, respectively, alongside the highest syngas production efficiency. Moreover, with an equivalence ratio of 1.6 and a fuel mixture containing 70 % CH4, the highest achievable syngas composition was found to be 0.3277 for CO, 0.2841 for H2, 0.0676 for CH4, and 0.2534 for CO2, indicating useful conditions for syngas production. Eventually, reaction pathways analyses revealed that the hydrogen abstraction reactions of hydrocarbon species by H radical which majorly progress through direct CH4 to H2 conversion route, and hydrocarbon recombination routes have a key role in H2 production from landfill gas. Moreover, for landfill gas with high CO2 content, direct CO2 to the CO reduction route is determinative. Conversely, when the CH4 content of landfill gas is high, hydrocarbon recombination followed by ketenyl radical formation and decomposition to CO is the primary pathway in different mixture equivalence ratios.
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来源期刊
Journal of CO2 Utilization
Journal of CO2 Utilization CHEMISTRY, MULTIDISCIPLINARY-ENGINEERING, CHEMICAL
CiteScore
13.90
自引率
10.40%
发文量
406
审稿时长
2.8 months
期刊介绍: The Journal of CO2 Utilization offers a single, multi-disciplinary, scholarly platform for the exchange of novel research in the field of CO2 re-use for scientists and engineers in chemicals, fuels and materials. The emphasis is on the dissemination of leading-edge research from basic science to the development of new processes, technologies and applications. The Journal of CO2 Utilization publishes original peer-reviewed research papers, reviews, and short communications, including experimental and theoretical work, and analytical models and simulations.
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