Phase equilibrium in the hydrogen energy chain

Zhang, Tao; Zhang, Yanhui; Katterbauer, Klemens; Shehri, Abdallah Al; Sun, Shuyu; Hoteit, Ibrahim

doi:10.1016/j.fuel.2022.125324

Cited by 41 publications

(23 citation statements)

References 42 publications

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“…Figure 13 c shows the distribution of the liquid and gas phases in the non-wetting system; the liquid phase is excluded from the dense part of porous media, as shown in Figure 14 . This also corresponds to previous studies because the liquid phase turns into the non-wetting phase in this condition [ 57 , 58 , 59 ].…”

Section: Resultssupporting

confidence: 92%

Study of the Imbibition Phenomenon in Porous Media by the Smoothed Particle Hydrodynamic (SPH) Method

Liu

Tao

Sun

2022

Entropy

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Over recent decades, studies in porous media have focused on many fields, typically in the development of oil and gas reservoirs. The imbibition phenomenon, a common mechanism affecting multi-phase flows in porous media, has shown more significant impacts on unconventional reservoir development, where the effect of the pore space increases with decreased pore sizes. In this paper, a comprehensive SPH method is applied, considering the binary interactions among the particles to study the imbibition phenomenon in porous media. The model is validated with physically meaningful results showing the effects of surface tension, contact angle, and pore structures. A heterogeneous porous medium is also constructed to study the effect of heterogeneity on the imbibition phenomenon; it can be referred from the results that the smaller pore throats and wetting surfaces are more preferred for the imbibition. The results show that the SPH method can be applied to solve the imbibition problems, but the unstable problem is still a sore point for the SPH method.

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Section: Resultssupporting

confidence: 92%

Study of the Imbibition Phenomenon in Porous Media by the Smoothed Particle Hydrodynamic (SPH) Method

Liu

Tao

Sun

2022

Entropy

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“…The main component of shale gas is CH 4 , which is also the main contributor to these two density peaks. The density of the CO 2 component shows the density peaks on the boundary of the kerogen wall, suggesting that CO 2 has a stronger adsorption ability than CH 4 on the kerogen, which reveals that CO 2 is an effective component to reduce the CH 4 adsorption, and CO 2 has been widely applied on the development of shale gas accordingly. , …”

Section: Resultsmentioning

confidence: 98%

“…The density of the CO 2 component shows the density peaks on the boundary of the kerogen wall, suggesting that CO 2 has a stronger adsorption ability than CH 4 on the kerogen, which reveals that CO 2 is an effective component to reduce the CH 4 adsorption, and CO 2 has been widely applied on the development of shale gas accordingly. 56,57 However, the H 2 O component presents a density enrichment, and it seems impossible that H 2 O tends to adsorb on an organic surface, which cannot be observed in the ideal organic model (CNTs and graphene layers). The reason is that the oxygen atoms in kerogen walls and H 2 O molecules can form hydrogen bonds.…”

Section: Resultsmentioning

confidence: 99%

Mechanism Analysis of Shale Gas Adsorption under Carbon Dioxide–Moisture Conditions: A Molecular Dynamic Study

2022

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In recent decades, shale gas, which has been regarded as a source of clean energy, is gradually replacing conventional energy. Shale gas adsorption in carbon dioxide (CO2)–moisture systems has been discussed in many previous studies; however, the intrinsic mechanism has not been clarified yet. In this work, the molecular dynamic (MD) method is adopted to study the adsorption behaviors of shale gas adsorption in the realistic kerogen nanoslit. The spatial density distributions of shale gas and different components have strong inhomogeneity. To reveal the heterogeneous adsorption mechanism, the potential of mean force (PMF) distributions of shale gas components are calculated on different target positions for the first time. The water (H2O) component prefers to adsorb on the oxygen-enriched position, as a result of the strong molecular polarity and hydrogen bond interactions. The CO2 component tends to adsorb on the carbon-rich site, which is the result of combining the van der Waals interaction and molecular polarity with kerogen walls. The potential energy contours are computed to verify the affinities between different components and the kerogen surface, and the potential energy difference can be observed between the bulk phase and adsorbed phase, which corresponds to the density and PMF analyses. The sensitivity analysis is also carried out to verify the above mechanism explanation. Higher temperature facilitates the desorption of shale gas, and higher pressure leads to more adsorption quantity. In the larger pore space, because of more content of H2O and CO2 molecules, the adsorption amount of methane (CH4) decreases. More content of CO2 is conducive to the desorption of shale gas, verified by cases in various component proportions.

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“…Hydrogen can be stored in several different conditions, including as a liquid at low temperatures, a gas at high temperatures, a solid, and dissolved within an organic solvent (Zhang et al, 2022b). Taken into account the extremely low critical temperature of hydrogen, phase stability plays a critical role in the safety management of the liquid storage processes.…”

Section: Hydrogen Storage and Transportationmentioning

confidence: 99%

Technology transition from traditional oil and gas reservoir simulation to the next generation energy development

Zhang

Liu

Sun

2022

Adv. Geo-Energy Res.

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Phase equilibrium in the hydrogen energy chain

Cited by 41 publications

References 42 publications

Study of the Imbibition Phenomenon in Porous Media by the Smoothed Particle Hydrodynamic (SPH) Method

Study of the Imbibition Phenomenon in Porous Media by the Smoothed Particle Hydrodynamic (SPH) Method

Mechanism Analysis of Shale Gas Adsorption under Carbon Dioxide–Moisture Conditions: A Molecular Dynamic Study

Technology transition from traditional oil and gas reservoir simulation to the next generation energy development

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