建立了表征页岩高压甲烷吸附和热力学参数的二元Langmuir模型

IF 6.9 1区 工程技术 Q2 ENERGY & FUELS International Journal of Coal Science & Technology Pub Date : 2023-10-01 DOI:10.1007/s40789-023-00629-x
Ke Hu, Qian Zhang, Yufei Liu, Muhammad Abdurrahman Thaika
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引用次数: 0

摘要

了解页岩中甲烷吸附机理是优化深层页岩气开发的关键一步。这是因为页岩中吸附的甲烷占地下页岩气资源的很大一部分。页岩具有不同的矿物组成和多尺度孔径,为了正确表征甲烷在页岩上的吸附,捕获吸附位点的能量非均质性至关重要。本文提出了一种考虑吸附相密度对温度和压力依赖性的二元Langmuir模型。该模型适用于页岩上甲烷吸附的等温线,压力高达30 MPa,温度范围从40到100°C。结果表明,该模型比传统模型更能准确地描述甲烷在页岩上的吸附行为,传统模型假设吸附相的密度为恒定值。此外,所提出的模型可以外推到更高的温度和压力。用正确推导的方程对热力学参数进行了分析。结果表明,广泛使用但不正确的方程会低估等等吸附热。忽略真实气体的行为、吸附相的体积和吸附部位的能量非均质性会导致对等等吸附热的过高估计。此外,从过量吸附数据计算的等容热只能用来粗略估计在极低压力下的实际等容热。
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A developed dual-site Langmuir model to represent the high-pressure methane adsorption and thermodynamic parameters in shale
Abstract Comprehending the mechanism of methane adsorption in shales is a crucial step towards optimizing the development of deep-buried shale gas. This is because the methane adsorbed in shale represents a significant proportion of the subsurface shale gas resource. To properly characterize the methane adsorption on shale, which exhibits diverse mineral compositions and multi-scale pore sizes, it is crucial to capture the energy heterogeneity of the adsorption sites. In this paper, a dual-site Langmuir model is proposed, which accounts for the temperature and pressure dependence of the density of the adsorbed phase. The model is applied to the isothermals of methane adsorption on shale, at pressures of up to 30 MPa and temperatures ranging from 40 to 100 °C. The results show that the proposed model can describe the adsorption behavior of methane on shale more accurately than conventional models, which assume a constant value for the density of adsorbed phase. Furthermore, the proposed model can be extrapolated to higher temperatures and pressures. Thermodynamic parameters were analyzed using correctly derived equations. The results indicate that the widely used, but incorrect, equation would underestimate the isosteric heat of adsorption. Neglecting the real gas behavior, volume of the adsorbed phase, and energy heterogeneity of the adsorption sites can lead to overestimation of the isosteric heat of adsorption. Furthermore, the isosteric heat evaluated from excess adsorption data can only be used to make a rough estimate of the real isosteric heat at very low pressure.
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来源期刊
CiteScore
11.40
自引率
8.40%
发文量
678
审稿时长
12 weeks
期刊介绍: The International Journal of Coal Science & Technology is a peer-reviewed open access journal that focuses on key topics of coal scientific research and mining development. It serves as a forum for scientists to present research findings and discuss challenging issues in the field. The journal covers a range of topics including coal geology, geochemistry, geophysics, mineralogy, and petrology. It also covers coal mining theory, technology, and engineering, as well as coal processing, utilization, and conversion. Additionally, the journal explores coal mining environment and reclamation, along with related aspects. The International Journal of Coal Science & Technology is published with China Coal Society, who also cover the publication costs. This means that authors do not need to pay an article-processing charge.
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