Article
Chemistry, Multidisciplinary
Takuma Misawa, Tomoaki Ishikawa, Satoshi Takeya, Saman Alavi, Ryo Ohmura
Summary: CO2 separation from H2 + CO2 gas mixture is essential for stable supply of blue hydrogen, and hydrate-based CO2 separation is a superior technology in terms of environmental and economic aspects. The study showed successful CO2 separation in the H2 + CO2 + CP + H2O system at 284 K, but with an increase in energy costs due to hydrogen loss.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Green & Sustainable Science & Technology
Jibao Zhang, Xialian Xing, Zhenyuan Yin, Ning Mao, Tianbiao He
Summary: This study investigates the effect of cyclopentane/water volume ratio, graphite size, and graphite/water volume ratio on CO2+C3H8 hydrate formation kinetics. The results show that cyclopentane can shift the hydrate phase equilibrium condition and accelerate hydrate formation. The smaller size of hydrophobic graphite provides more sites for hydrate nucleation and growth. The synergy of graphite and cyclopentane reduces the hydrate induction time and increases the hydrate conversion rate.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Engineering, Environmental
Youngki Lee, Hyeonjin Kim, Wonhyeong Lee, Dong Woo Kang, Jae W. Lee, Yun-Ho Ahn
Summary: This review explores the potential of clathrate hydrates as a technology for CO2 capture and separation, showcasing methods to improve CO2 hydrate formation and separate CO2 from gas mixtures. It also delves into additional applications such as cold energy storage and the advantages of the CH4-CO2 replacement method.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Energy & Fuels
Wang Weiyang, Zhou Chenru, Liu Chenwei, Wang Zhiyuan, Li Mingzhong
Summary: This study investigated the interaction behaviors of hydrate particle-particle/droplet and hydrate deposition-pipe wall in the cyclopentane (CyC5) vapor phase. The results showed that hydrate formation rate is higher in the vapor phase compared to the liquid CyC5 phase. The hydrate particle-particle adhesion forces slightly increase with temperature in the vapor phase, and the hydrate-droplet adhesion forces change with the conversion of water in liquid bridges. The adhesion strengths of hydrate deposition increase with substrate roughness and formation/annealing time, but decrease with temperature.
Article
Energy & Fuels
Wang Weiyang, Zhou Chenru, Liu Chenwei, Wang Zhiyuan, Li Mingzhong
Summary: This study experimentally investigated the interaction behaviors of hydrate particle-particle/droplet and hydrate deposition-pipe wall in the cyclopentane vapor phase. It found that hydrate formation in the vapor phase is a fast-growing process with rough particle surfaces exhibiting strong hydrophilic characteristics. The adhesion forces between hydrate particles in the vapor phase slightly increase with temperature and are approximately 2-3 times higher than in the liquid cyclopentane phase. In the case of hydrate deposition, the adhesion strengths increase with substrate roughness and formation/annealing time, but decrease with temperature.
Article
Energy & Fuels
Hao-Yang Li, Xiao-Sen Li, Yi-Song Yu, Zhao-Yang Chen
Summary: In this study, the morphologies of methane hydrate formation in a system containing different mole ratios of tetrahydrofuran (THF) and cyclopentane (CP) at two different temperatures were systematically studied. The results showed that a hydrate film quickly formed at the interface between CP and the THF solution phase, significantly decreasing gas-liquid mass transfer efficiency. Interestingly, the hydrate layer broke when the temperature increased. Three stages of hydrate formation were observed in the system at the higher temperature. Furthermore, the type of promoters used in the system had no effect on CH4 occupancy in sII cages after the hydrate layer ruptured.
Article
Energy & Fuels
Erfan Khanmohammadian, Mohsen Mohammadi, Rohallah Hashemi, Sina Eslami, Mohammad Reza Ehsani
Summary: In this study, the separation of CO2 gas from a CO2/CH4 mixture was investigated using the gas hydrate formation method. Silica and APTES surface-modified silica nanoparticles with potassium hydroxide were used as additives. The presence of silica improved gas consumption, separation factor, and recovery factor. The optimal nanofluids with silica and potassium hydroxide showed a significant increase in gas consumption, separation factor, and recovery factor compared to pure water. The gas-liquid ratio and initial pressure affected the gas consumption, separation, and recovery factors.
Article
Chemistry, Multidisciplinary
Muhammad A. Kamel, Aleksei S. Lobasov, Surya Narayan, Konstantin S. Pervunin, Christos N. Markides
Summary: This study investigates the growth mechanism and process of hydrate formation by observing the process on a water drop immersed in liquid cyclopentane. The study reveals that the morphology of hydrate film changes with the subcooling temperature, and the growth rate of hydrate varies with the degree of subcooling.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Energy & Fuels
Jiyou Qin, Daigo Chinen, Shinya Obara
Summary: This study developed a battery system that utilizes a gas hydrate heat cycle for energy storage and discharge, increasing the overall efficiency by using CP as a catalyst.
Article
Engineering, Chemical
Rui Du, Yixuan Fu, Lunxiang Zhang, Jiafei Zhao, Yongchen Song, Zheng Ling
Summary: Significant advances have been made in seawater desalination, but the discharge of hypersaline concentrate presents challenges for treatment. This study demonstrates the potential of hydrate-based desalination in treating brine with high concentrations of salt. Carbon materials play a crucial role in inducing hydrate nucleation and the crystallinity and surface compositions of these materials impact desalination efficiency. These findings will help in developing effective hydrate promoters for treating hypersaline brine.
Article
Engineering, Chemical
Zucheng Cheng, Weiguo Liu, Shaohua Li, Sijia Wang, Yingying Liu, Xiang Sun, Cong Chen, Lanlan Jiang, Yongchen Song
Summary: This study evaluated the performance of SDS in the separation efficiency of simulated biogas. The experimental results showed that higher driving forces led to a significant increase in gas capture, dominated by the CH4 component. Hydrate growth mainly occurred in the liquid phase, and the separation factor was positively correlated with the induction time. Gas capture per unit volume of solution could be improved at higher gas-liquid ratios, while high-pressure failure behavior was observed. The defoamer had no significant effect on hydrate generation kinetics and separation efficiency.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Chemical
Xiaoya Zang, He Li, Yubao Zhang, Yong Chen, Yong He, Nengyou Wu, Xuebing Zhou, Deqing Liang
Summary: The kinetic process of hydrate formation from CH4/CO2/N2 gas mixtures in the presence of CP and TBAB and its effect on gas separation efficiency were studied. The combination of CP and TBAB was found to inhibit the separation efficiency compared to pure CP. The CO2 split ratio followed the order SDS > CP > TBAB/CP > CP/SDS > TBAB, and both the adsorption capacity and gas consumption decreased with increasing TBAB concentration. Raman and XRD tests confirmed the presence of sI, sII, and semi-clathrate hydrates, and SEM images showed ellipsoid-shaped hydrate crystals with increasing specific surface area at higher TBAB concentration. These findings are important for evaluating the feasibility of using TBAB and CP in HBGS technology.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Review
Thermodynamics
Saeid Sinehbaghizadeh, Agus Saptoro, Amir H. Mohammadi
Summary: Global warming, caused by anthropogenic CO2 emissions, has become a pressing environmental concern. Natural gas hydrate reservoirs have emerged as a potential source of energy and a possible solution for CO2 sequestration. CO2 hydrates, as safe and non-flammable compounds, can be used in industrial processes if their approaches can be improved. Laboratory experiments, process modelling, and molecular dynamics simulations can aid in understanding the properties and mechanisms of CO2 hydrates. This review focuses on the sequestration of CO2, process flow diagrams, the effects of hydrate promoters and porous media, and the fundamental properties of CO2 hydrates at the molecular level.
PROGRESS IN ENERGY AND COMBUSTION SCIENCE
(2022)
Article
Thermodynamics
Angsar Serikkali, Hieu Ngo Van, Trung-Kien Pham, Quang Duyen Le, Jerome Douzet, Jean-Michel Herri, Baptiste Bouillot
Summary: This study investigates the thermodynamics of mixed CO2/CP hydrates and discusses the equilibrium data obtained under different concentrations and pressures, as well as the thermodynamic consistency tests conducted on the data. Results show a greater inhibition effect of cation Ca2+ on mixed hydrates.
FLUID PHASE EQUILIBRIA
(2022)
Article
Engineering, Chemical
Lagnajita Paul, Namrata Gaikwad, Rajnish Kumar
Summary: Hydrate-based desalination is a promising and environmentally friendly technique for producing fresh water from saline water. This research investigated the kinetics of hydrate formation in saline water and compared the utility of CO2 and N-2 as hydrate formers for desalination work.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Energy & Fuels
Juan He, Xiaosen Li, Zhaoyang Chen, Qingping Li, Yu Zhang, Yi Wang, Zhiming Xia, Changyu You
Summary: The study found that initiating electrical heating before depressurization and performing soaking at a pressure below equilibrium can increase hydrate dissociation rate and improve energy efficiency. Additionally, not using electrical heating during depressurization can significantly reduce water production rate and increase energy efficiency. The results suggest that careful consideration of the timing and conditions of electrical heating can optimize hydrate dissociation and energy use in hydrate exploitation.
Article
Energy & Fuels
Chun-Gang Xu, Min Wang, Gang Xu, Xiao-Sen Li, Wei Zhang, Jing Cai, Zhao-Yang Chen
Summary: Research demonstrates that CO2-CP binary hydrate and CO2 hydrate are formed successively and coexist in the final hydrate in the CP-CO2 system. The formation of these two hydrates causes two pressure drops.
Article
Energy & Fuels
Xuan Kou, Xiao-Sen Li, Yi Wang, Kun Wan, Zhao-Yang Chen
Summary: The study analyzed the effects of particle size and hydrate saturation on hydrate growth habits, pore structure properties, and permeability reduction through microscale experiments and pore-network models. The results showed the evolution of gas hydrate pore-habit and its distribution in pores, highlighting the importance of pore interconnectivity in hydrate-bearing sediments. The study also proposed an equation for absolute permeability in the presence of gas hydrate, validated by experimental results.
Article
Energy & Fuels
Ke-Feng Yan, Hao Chen, Zhao-Yang Chen, Xiao-Sen Li, Chun-Gang Xu, Yu Zhang, Zhi-Ming Xia, Yi-Song Yu
Summary: This study investigates the impact of H2O on CH4-CO2 displacement behavior using molecular dynamics simulation and quantum mechanics calculation. It reveals that the electrostatic interaction of H2O-H2O and H2O-gas is a key factor in the CH4-CO2 replacement mechanism, suggesting that modifying the electrostatic interaction with H2O molecules could enhance the replacement efficiency.
Article
Thermodynamics
Gang Xu, Chun-Gang Xu, Min Wang, Jing Cai, Zhao-Yang Chen, Xiao-Sen Li
Summary: The study demonstrated that using nickel foam can increase the gas consumption rate and separation efficiency of hydrate-based CO2 separation, while also contributing to the stability of hydrogen in the hydrate phase.
Article
Thermodynamics
Juan He, Xiaosen Li, Zhaoyang Chen, Changyu You, Kefeng Yan, Zhiming Xia, Qingping Li
Summary: The distribution of hydrates in sediment affects the changing trends of effective thermal conductivity, especially influenced by gas saturation, water saturation or pressure. Different formation processes of hydrates exhibit various trends in thermal conductivity changes, with non-uniform distribution causing different behaviors.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Engineering, Chemical
Chun-Gang Xu, Wei Zhang, Ke-Feng Yan, Jing Cai, Zhao-Yang Chen, Xiao-Sen Li
Summary: The hydrate-based CH4-CO2 replacement technology shows promising potential in methane production and CO2 capture and sequestration, with the replacement process being affected by the potential energy of destruction and binding energy. Additionally, the concentration of CO2 plays a controlling influence on the replacement process, with higher CO2 concentrations leading to greater methane production efficiency.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Energy & Fuels
Lei Zhang, Yu Zhang, Chang Chen, Xiao-Sen Li, Zhao-Yang Chen
Summary: A two-dimensional numerical model was established on the hydrate reservoir at station W17, Shenhu area of the South China Sea to study the response of the reservoir to drilling fluid temperature and salinity values. Results showed that temperature and pressure changes during drilling process promoted hydrate decomposition, leading to secondary hydrate formation. Increasing drilling fluid temperature significantly enhanced hydrate decomposition and pressure increase near the wellbore, potentially causing pore fluid flow into the wellbore.
Article
Physics, Multidisciplinary
Haopeng Zeng, Yu Zhang, Lei Zhang, Zhaoyang Chen, Xiaosen Li
Summary: Depressurization combined with brine injection is a potential method for improving the production efficiency of natural gas hydrate fields and avoiding secondary formation of hydrate. The experimental results show that high-water production reduces the final gas recovery, while increasing NaCl concentration only effectively promotes gas production rate in the early stage. The injection of NaCl solution decreases the lowest temperature in sediments during hydrate production and increases heat transfer.
Article
Physics, Multidisciplinary
Zhiwen Zhang, Xiaosen Li, Zhaoyang Chen, Yu Zhang, Hao Peng
Summary: In this study, the electrical resistivity properties of gas-water-sand fluid were experimentally investigated. The effects of various factors on the resistivity of the multiphase fluid were studied, and the measurement devices and operating parameters were optimized. A novel combined resistivity method was developed, which showed promising results for measuring the phase fractions of gas-water-sand fluid.
Article
Engineering, Marine
Haopeng Zeng, Yu Zhang, Lei Zhang, Zhaoyang Chen, Xiaosen Li
Summary: The presence of salts and sea mud affects the formation of natural gas hydrates (NGH). Low NaCl concentration and low montmorillonite content can reduce the induction time of hydrate formation, while high NaCl concentration and high montmorillonite content significantly increase the induction time. The increase in NaCl concentration enhances the inhibition of hydrate formation and reduces the final water conversion.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Review
Energy & Fuels
Hao Peng, Xiaosen Li, Zhaoyang Chen, Yu Zhang, Changyu You
Summary: This paper focuses on the seepage studies of hydrate-bearing sediment (HBS), including the application of theories, normalized permeability models, extension with new technology, and development. There is currently no review that has predicted the original permeability of sediments without hydrates, and there are limited studies on seepage theories using new technologies. However, this review summarizes the prospects, evolution, and application of HBS seepage theories from the perspectives of experiments, numerical simulation, and microscopic visualization, and discusses the current limitations and directions of these theories.
Article
Energy & Fuels
Hongfei Ji, Xiao-Sen Li, Zhaoyang Chen, Changyu You, Hao Peng, Yun Feng
Summary: This study employs an improved multiple-point geostatistics simulation method to generate a series of images of porous media that accurately reproduce the distribution of hydrates in sediments. The algorithm successfully solves the problem of hydrate blockage and ensures similarity in variogram and visual properties with the training image. The feasibility of predicting the pore habit of hydrates with time using this novel method is proven by a verification case. This research offers a new approach to predict hydrate distribution behavior and the algorithm may be widely applied by scanning training images from different reservoirs.
Article
Energy & Fuels
Hao-Yang Li, Xiao-Sen Li, Yi-Song Yu, Zhao-Yang Chen
Summary: In this study, the morphologies of methane hydrate formation in a system containing different mole ratios of tetrahydrofuran (THF) and cyclopentane (CP) at two different temperatures were systematically studied. The results showed that a hydrate film quickly formed at the interface between CP and the THF solution phase, significantly decreasing gas-liquid mass transfer efficiency. Interestingly, the hydrate layer broke when the temperature increased. Three stages of hydrate formation were observed in the system at the higher temperature. Furthermore, the type of promoters used in the system had no effect on CH4 occupancy in sII cages after the hydrate layer ruptured.
Article
Energy & Fuels
Hao Peng, Xiaosen Li, Zhaoyang Chen, Yu Zhang, Hongfei Ji, Changyu You
Summary: This research reveals the evolution of growth modes in hydrates by analyzing the competition parameter and saturation, providing a new approach for industrial exploitation and simulation calculation.
GAS SCIENCE AND ENGINEERING
(2023)
Article
Thermodynamics
Yong Cheng, Fukai Song, Lei Fu, Saishuai Dai, Zhiming Yuan, Atilla Incecik
Summary: This paper investigates the accessibility of wave energy absorption by a dual-pontoon floating breakwater integrated with hybrid-type wave energy converters (WECs) and proposes a hydraulic-pneumatic complementary energy extraction method. The performance of the system is validated through experiments and comparative analysis.
Article
Thermodynamics
Jing Gao, Chao Wang, Zhanwu Wang, Jin Lin, Runkai Zhang, Xin Wu, Guangyin Xu, Zhenfeng Wang
Summary: This study aims to establish a new integrated method for biomass cogeneration project site selection, with a focus on the application of the model in Henan Province. By integrating Geographic Information System and Multiple Criterion Decision Making methods, the study conducts site selection in two stages, providing a theoretical reference for the construction of biomass cogeneration projects.
Article
Thermodynamics
Mert Temiz, Ibrahim Dincer
Summary: The current study presents a hybrid small modular nuclear reactor and solar-based system for sustainable communities, integrating floating and bifacial photovoltaic arrays with a small modular reactor. The system efficiently generates power, hydrogen, ammonia, freshwater, and heat for residential, agricultural, and aquaculture facilities. Thermodynamic analysis shows high energy and exergy efficiencies, as well as large-scale ammonia production meeting the needs of metropolitan areas. The hybridization of nuclear and solar technologies offers advantages of reliability, environmental friendliness, and cost efficiency compared to renewable-alone and fossil-based systems.
Editorial Material
Thermodynamics
Wojciech Stanek, Wojciech Adamczyk
Article
Thermodynamics
Desheng Xu, Yanfeng Li, Tianmei Du, Hua Zhong, Youbo Huang, Lei Li, Xiangling Duanmu
Summary: This study investigates the optimization of hybrid mechanical-natural ventilation for smoke control in complex metro stations. The results show that atrium fires are more significantly impacted by outdoor temperature variations compared to concourse/platform fires. The gathered high-temperature smoke inside the atrium can reach up to 900 K under a 5 MW train fire energy release. The findings provide crucial engineering insights into integrating weather data and adaptable ventilation protocols for smoke prevention/mitigation.
Article
Thermodynamics
Da Guo, Heping Xie, Mingzhong Gao, Jianan Li, Zhiqiang He, Ling Chen, Cong Li, Le Zhao, Dingming Wang, Yiwei Zhang, Xin Fang, Guikang Liu, Zhongya Zhou, Lin Dai
Summary: This study proposes a new in-situ pressure-preserved coring tool and elaborates its pressure-preserving mechanism. The experimental and field test results demonstrate that this tool has a high pressure-preservation capability and can maintain a stable pressure in deep wells. This study provides a theoretical framework and design standards for the development of similar technologies.
Article
Thermodynamics
Aolin Lai, Qunwei Wang
Summary: This study assesses the impact of China's de-capacity policy on renewable energy development efficiency (REDE) using the Global-MSBM model and the difference-in-differences method. The findings indicate that the policy significantly enhances REDE, promoting technological advancements and marketization. Moreover, regions with stricter environmental regulations experience a higher impact.
Article
Thermodynamics
Mostafa Ghasemi, Hegazy Rezk
Summary: This study utilizes fuzzy modeling and optimization to enhance the performance of microbial fuel cells (MFCs). By simulating and analyzing experimental data sets, the ideal parameter values for increasing power density, COD elimination, and coulombic efficiency were determined. The results demonstrate that the fuzzy model and optimization methods can significantly improve the performance of MFCs.
Article
Thermodynamics
Zhang Ruan, Lianzhong Huang, Kai Wang, Ranqi Ma, Zhongyi Wang, Rui Zhang, Haoyang Zhao, Cong Wang
Summary: This paper proposes a grey box model for fuel consumption prediction of wing-diesel hybrid vessels based on feature construction. By using both parallel and series grey box modeling methods and six machine learning algorithms, twelve combinations of prediction models are established. A feature construction method based on the aerodynamic performance of the wing and the energy relationship of the hybrid system is introduced. The best combination is obtained by considering the root mean square error, and it shows improved accuracy compared to the white box model. The proposed grey box model can accurately predict the daily fuel consumption of wing-diesel hybrid vessels, contributing to operational optimization and the greenization and decarbonization of the shipping industry.
Article
Thermodynamics
Huayi Chang, Nico Heerink, Junbiao Zhang, Ke He
Summary: This study examines the interaction between off-farm employment decisions between couples and household clean energy consumption in rural China, and finds that two-paycheck households are more likely to consume clean energy. The off-farm employment of women is a key factor driving household clean energy consumption to a higher level, with wage-employed wives having a stronger influence on these decisions than self-employed ones.
Article
Thermodynamics
Hanguan Wen, Xiufeng Liu, Ming Yang, Bo Lei, Xu Cheng, Zhe Chen
Summary: Demand-side management is crucial to smart energy systems. This paper proposes a data-driven approach to understand the relationship between energy consumption patterns and household characteristics for better DSM services. The proposed method uses a clustering algorithm to generate optimal customer groups for DSM and a deep learning model for training. The model can predict the possibility of DSM membership for a given household. The results demonstrate the usefulness of weekly energy consumption data and household socio-demographic information for distinguishing consumer groups and the potential for targeted DSM strategies.
Article
Thermodynamics
Xinglan Hou, Xiuping Zhong, Shuaishuai Nie, Yafei Wang, Guigang Tu, Yingrui Ma, Kunyan Liu, Chen Chen
Summary: This study explores the feasibility of utilizing a multi-level horizontal branch well heat recovery system in the Qiabuqia geothermal field. The research systematically investigates the effects of various engineering parameters on production temperature, establishes mathematical models to describe their relationships, and evaluates the economic viability of the system. The findings demonstrate the significant economic feasibility of the multi-level branch well system.
Article
Thermodynamics
Longxin Zhang, Songtao Wang, Site Hu
Summary: This investigation reveals the influence of tip leakage flow on the modern transonic rotor and finds that the increase of tip clearance size leads to a decline in rotor performance. However, an optimal tip clearance size can extend the rotor's stall margin.
Article
Thermodynamics
Kristian Gjoka, Behzad Rismanchi, Robert H. Crawford
Summary: This paper proposes a framework for assessing the performance of 5GDHC systems and demonstrates it through a case study in a university campus in Melbourne, Australia. The results show that 5GDHC systems are a cost-effective and environmentally viable solution in mild climates, and their successful implementation in Australia can create new market opportunities and potential adoption in other countries with similar climatic conditions.
Article
Thermodynamics
Jianwei Li, Guotai Wang, Panpan Yang, Yongshuang Wen, Leian Zhang, Rujun Song, Chengwei Hou
Summary: This study proposes an orientation-adaptive electromagnetic energy harvester by introducing a rotatable bluff body, which allows for self-regulation to cater for changing wind flow direction. Experimental results show that the output power of the energy harvester can be greatly enhanced with increased rotatory inertia of the rotating bluff body, providing a promising solution for harnessing wind-induced vibration energy.
