A critical review of experimental and CFD techniques to characterize the mixing performance of anaerobic digesters for biogas production
A critical review of experimental and CFD techniques to characterize the mixing performance of anaerobic digesters for biogas production
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DOI：
10.1007/s11157-022-09626-z
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发表时间：
2022-07
期刊：
影响因子：
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通讯作者：
Lili Li;Kun Wang;Qingliang Zhao;Qingwei Gao;Huimin Zhou;Junqiu Jiang;Wangyang Mei
中科院分区：
文献类型：
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作者：
Lili Li;Kun Wang;Qingliang Zhao;Qingwei Gao;Huimin Zhou;Junqiu Jiang;Wangyang Mei
厌氧消化（AD）产生的沼气作为化石燃料的重要替代品，为能源回收和环境可持续发展做出了贡献。厌氧反应器内的不完全或低效混合可能会导致沼气产量不佳或能源浪费。因此，确定混合性能对于沼气池的设计、运行和最大沼气产量具有重要意义。多年来，已经开发了各种实验和计算流体动力学 (CFD) 技术来表征消化池的混合性能。这篇综述描述了混合对 AD 沼气生产的关键影响。然后，对局部和全球范围内可用的实验技术的优点、缺点、表征能力和应用范围进行了回顾和比较。此外，还对CFD技术在AD中的实现、可靠性、指标和应用进行了深入讨论。基于上述讨论，混合显着影响 AD 甲烷产量，为了最大程度地提高沼气产量，间歇混合是优选的。对于任意大小的消化池，局部实验技术被认为是最简单且最便宜的；基于计算机系统的全球实验技术因其在AD流场中的应用而受到越来越多的关注。需要更多的研究工作来发现新的实验技术，克服沼渣不透明度和工业反应器几何形状的限制，此外，基于 CFD 将流体动力学与生物动力学耦合的隔室模型很有趣，并且可以更好地实施 CFD 应用。图形摘要
Biogas from anaerobic digestion (AD), as an important alternative to fossil fuels, has contributed to energy recovery and environmental sustainability. Incomplete or inefficient mixing within anaerobic reactors can result in poor biogas production or energy wastage. Thus, identifying mixing performance is meaningful for the digester design, operation and maximum biogas production. Over the years, various experimental and computational fluid dynamics (CFD) techniques have been developed to characterize the mixing performance of digesters. This review described the critical impact of mixing on biogas production in AD. Then, experimental techniques available on local and global scales were reviewed and compared in terms of their advantages, disadvantages, characterization capabilities and scope of application. Moreover, the implementation, reliability, indicators and application of CFD techniques in AD were thoroughly discussed. Based on the above discussion, mixing significantly affects AD methane production, and intermittent mixing is preferred for maximum biogas production. Local experimental techniques have been considered to be the simplest and cheapest for arbitrarily sized digesters; global experimental techniques relying on computer systems have received increasing attention for their applications in AD flow fields. More research efforts are needed to discover new experimental techniques that overcome the limitations of digestate opacity and industrial reactor geometries, in addition, compartmental models based on CFD to couple hydrodynamics with biokinetics are interesting and allow for greater implementation of CFD applications.Graphical abstract