利用生物反应输运模型研究地下生物甲烷化

D. S. Nikolaev, N. Moeininia, H. Ott, Hagen Bueltemeier
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引用次数: 3

摘要

地下生物甲烷化是一种很有前途的大规模可再生能源存储技术。此外,它还可以利用原位微生物作为生物催化剂,通过在多孔储层中产生“可再生甲烷”来回收二氧化碳。潜在的候选储层是枯竭的气田,甚至是废弃的储气库,提供巨大的存储容量,以平衡季节性能源供需波动。本文讨论了潜在的生物甲烷化过程,作为由德国联邦教育和研究部(BMBF)资助的正在进行的研究项目“Bio-UGS -二氧化碳和氢气向甲烷的生物转化”的一部分。首先,对水动力过程进行了评估,并对相关的微生物过程进行了综述。然后,基于典型的现场规模模拟,评估了生物反应性输运过程及其对操作的影响。通过现场数值模拟研究了氢气转化过程。为此,(Hagemann 2018)在开源的DuMux (Flemisch et al. 2011)多孔介质流模拟工具包中实现了两相多组分生物反应输运模型。潜在的过程包括反应物和产物的运输,特定成分的消耗,以及微生物种群的相关生长和衰变,从而形成生物反应性运输模型。产甲烷反应的微生物动力学参数取自现有文献。模拟研究涵盖了概念油田规模模型的不同场景,研究了井位、注入速率和气体成分的影响。由于模拟结果对生物转化动力学非常敏感,因此必须获得特定领域的转化率。因此,Bio-UGS项目伴随着本文框架之外的实验室实验。其他参数则是设计问题;在目前枯竭气田的情况下,这些参数是耦合的,可以选择将氢和二氧化碳完全转化为甲烷。特别是在给定注入速度和气体成分的可能情况下,井距可以被认为是主要设计参数。本研究将先前开发的代码的应用从均匀2d扩展到非均匀3d情况。模拟模拟了40兆瓦电解过程中二氧化碳和氢气的共注入。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Investigation of Underground Bio-Methanation Using Bio-Reactive Transport Modeling
Underground bio-methanation is a promising technology for large-scale renewable energy storage. Additionally, it enables the recycling of CO2 via the generation of "renewable methane" in porous reservoirs using in-situ microbes as bio-catalysts. Potential candidate reservoirs are depleted gas fields or even abandoned gas storages, providing enormous storage capacity to balance seasonal energy supply and demand fluctuations. This paper discusses the underlying bio-methanation process as part of the ongoing research project "Bio-UGS – Biological conversion of carbon dioxide and hydrogen to methane," funded by the German Federal Ministry of Education and Research (BMBF). First, the hydrodynamic processes are assessed, and a review of the related microbial processes is provided. Then, based on exemplary field-scale simulations, the bio-reactive transport process and its consequences for operation are evaluated. The hydrogen conversion process was investigated by numerical simulations on field scale. For this, a two-phase multi-component bio-reactive transport model was implemented by (Hagemann 2018) in the open-source DuMux (Flemisch et al. 2011) simulation toolkit for porous media flow. The underlying processes include the transport of reactants and products, consumption of specific components, and the related growth and decay of the microbial population, resulting in a bio-reactive transport model. The microbial kinetic parameters of methanogenic reactions are taken from the available literature. The simulation study covers different scenarios on conceptional field-scale models, studying the impact of well placement, injection rates, and gas compositions. Due to a significant sensitivity of the simulation results to the bio-conversion kinetics, the field-specific conversion rates must be obtained. Thus, the Bio-UGS project is accompanied by laboratory experiments out of the frame of this paper. Other parameters are rather a matter of design; in the present case of depleted gas fields, those parameters are coupled and can be chosen to convert fully hydrogen and carbon dioxide to methane. Especially the well spacing can be considered the main design parameter in the likely case of a given injection rate and gas composition. This study extends the application of the previously developed code from a homogeneous-2D to the heterogeneous-3D case. The simulations mimic the co-injection of carbon dioxide and hydrogen from a 40 MW electrolysis.
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