Article
Energy & Fuels
Xingxun Li, Ming Liu, Qingping Li, Weixin Pang, Guangjin Chen, Changyu Sun
Summary: This study investigated the formation and depressurization-induced dissociation behaviors of methane hydrate in porous media using a high-pressure transparent micro-packed bed reactor. The results revealed the effect of methane bubble dispersion on hydrate formation, observed hydrate reformation during depressurization, and demonstrated the impact of fluid extraction rate on hydrate reformation. The dissociation process of hydrate and fluid migration phenomena in the pore spaces were also visualized.
Article
Thermodynamics
Zhaobin Zhang, Tao Xu, Shouding Li, Xiao Li, Maryelin Josefina Briceno Montilla, Cheng Lu
Summary: A heat flow coupling algorithm was established for methane hydrate dissociation in porous media, and a core-scale dissociation model was verified against laboratory experiments. The evolutions of key characteristics were analyzed, and the effects of heat conductivity and permeability on dissociation characteristics and gas production rate were studied. Three different modes were identified based on heat conductivity and permeability, with each mode having distinct effects and dissociation front expanding characteristics. This analysis enhances understanding of the hydrate dissociation process.
Article
Energy & Fuels
Qing-Ping Li, Xin Lv, Wei-Xin Pang, Hai-Yuan Yao, Yang Ge, Jun-Ao Wang
Summary: This study investigates the impact of permeability on the decomposition characteristics of hydrate-bearing sediments using a laboratory model. Results show that cores with low permeability experience faster pressure reduction, while cores with high permeability exhibit quicker gas production rates.
Article
Engineering, Chemical
Xuke Ruan, Xiao-Sen Li
Summary: This study investigated the surface area of methane hydrate during dissociation in porous media by comparing experimental results with numerical simulations. Two conceptual models were proposed based on the morphology of hydrate, which showed the importance of hydrate dissociation surface area for gas production. The results indicated the significant impact of hydrate dissociation surface area on cumulative gas production, with different models performing better at different hydrate saturations.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Thermodynamics
Rui Song, Shuyu Sun, Jianjun Liu, Chunhe Yang
Summary: The study presents a novel enthalpy-porosity technique coupled with volume of fraction (VOF) method for modeling the phase-change process of methane hydrate dissociation and multi-phase flow. The proposed theoretical model is validated by comparison with experiments and numerical modeling, showing its ability to simulate the effects of phase change on pore structure evolution, multiphase flow, heat and mass transfer, and kinetic reaction processes. This study provides new insights into pore-scale modeling of multiphase flow with phase change.
Article
Engineering, Marine
Xuyang Guo, Yan Jin, Jingyu Zi, Jiaying Lin, Bolong Zhu, Qian Wen, Qi Jing
Summary: Sand production is a significant challenge in the exploitation of methane hydrates, affecting gas productivity. This study presents a numerical model that describes the coupled thermal-hydraulic-mechanical-chemical responses and sand production patterns during horizontal well depressurization in methane-hydrate-bearing sediments. The results show the spatial and temporal evolution patterns of multi-physical fields and highlight the sensitivity of gas and sand production rates to various parameters.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Chemical
Xingxun Li, Cunning Wang, Qingping Li, Weixin Pang, Guangjin Chen, Changyu Sun
Summary: Understanding the mechanisms of hydrate formation and dissociation through microfluidic visualization in a porous micromodel is essential for natural gas hydrate exploration. Different methane hydrate formations and dissociation behaviors were observed, with significant differences between methane-pure water and methane-brine systems. The study also highlighted the impact of multiple formation-dissociation processes on gas-liquid interfaces and subsequent hydrate behaviors.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Thermodynamics
Gang Li, Xiao-Sen Li, Qiu-Nan Lv, Chang-Wen Xiao, Jian-Wu Liu
Summary: To accurately characterize the Thermal-Hydraulic-Chemical (THC) process in hydrate reservoirs, a mathematical model with improved parameters was developed. The Full Implicit Simulator of Hydrate (FISH) successfully reproduced the experiment of hydrate dissociation and obtained unified parameters for the entire process. The numerical simulator can be used to predict the behavior of hydrate-bearing sediments in the laboratory or evaluate the gas production potential from marine or permafrost hydrate reservoirs.
Article
Energy & Fuels
Mingqiang Chen, Qingping Li, Xin Lv, Weixin Pang, Chaohui Lyu, Huiyun Wen, Yang Ge
Summary: Permeability is a crucial factor in understanding fluid flow in hydrate-bearing sediments. This paper constructs a pore network model to investigate the dynamic permeability evolution and explores the effects of various factors on it. The study reveals that hydrate narrows the flow space, leading to a significant decrease in dynamic permeability. The initial aspect ratio, coordination number, and pore throat cross-sections also play a role in permeability evolution.
Article
Energy & Fuels
Li Huang, Jiale Kang, Qingtao Bu, Qingguo Meng, Changling Liu, Nengyou Wu
Summary: In this study, a large-scale reactor FLYS was set up to simulate and evaluate gas production and flow features of hydrate dissociation. The experimental results showed that hydrate recovery process can be divided into four stages and there might be blockage issues at the bottom of the system during gas recovery, but it wouldn't significantly affect gas production.
Article
Energy & Fuels
Jyoti Shanker Pandey, Orjan Strand, Nicolas von Solms, Stian Almenningen, Geir Ersland
Summary: Currently, there is a lack of visualization studies on fluid migration and hydrate rearrangement during CO2 injection into CH4 hydrates. This experimental study provides the first pore-level visualization of gas-saturated CH4 hydrates when liquid CO2 is injected, revealing the impacts of CO2 injection on the morphology evolution of CH4 hydrates and its importance for improving CH4 gas recovery without losing hydrate mass.
Article
Engineering, Environmental
Jun Chen, Jianjian Wu, Yaosong Zeng, Zhikai Liang, Guangjin Chen, Bei Liu, Zhi Li, Bin Deng
Summary: The self-preservation effect of methane hydrate was improved by introducing deuterium oxides (D2O) as host molecules, leading to an increase in stability.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Thermodynamics
Shuang Dong, Mingjun Yang, Lei Zhang, Jia-nan Zheng, Yongchen Song
Summary: This study investigates the thermodynamic evolution of methane hydrate-bearing deposits during long depressurization. Five experiments with different methane yields were conducted to simulate the process. The results show that the rates of depressurization and hydrate dissociation increase linearly with increasing methane yield. Icing occurs when the pressure reaches a certain level and accelerates the dissociation of hydrates. Different exploitation stages exhibit different thermodynamic responses due to the combination of various non-equilibrium processes. The findings provide insights into the complex coupling mechanism of phase change and heat and mass transfer in methane hydrate exploitation.
Article
Engineering, Chemical
Saphir Venet, Fabrice Guerton, Arnaud Desmedt, Daniel Broseta
Summary: Insights into the porous structure of surfactant-promoted gas hydrate can be obtained from experiments probing very different length scales, one inferring porosity and average pore size from volume increase and imbibition rate, and the other visualizing pores and determining fluid and hydrate contents at the micron scale using optical microscopy and Raman microspectroscopy. The observed porous methane hydrate formed from a 500 ppmw SDS solution under moderate subcooling has a porosity in the range of 60-70% and pore sizes of about 20-30 μm.
CHEMICAL ENGINEERING SCIENCE
(2022)
Review
Chemistry, Applied
Yue Qin, Liyan Shang, Zhenbo Lv, Jianyu He, Xu Yang, Zhien Zhang
Summary: This paper reviews the recent applications of porous media in methane hydrate formation and analyzes the influence of porous media systems on the phase equilibria and formation kinetics of hydrates. The nature of the media on methane hydrate formation in porous media systems is comprehensively summarized, and the effect of various promoters on methane hydrate formation is evaluated. Mechanisms for methane hydrate formation in various porous media systems are proposed, and the future perspectives and challenges of hydrate-based technologies in tackling global climate change are discussed.
JOURNAL OF ENERGY CHEMISTRY
(2022)
Article
Energy & Fuels
Xuan Kou, Jing-Chun Feng, Xiao-Sen Li, Yi Wang, Zhao-Yang Chen
Summary: The memory effect of gas hydrate can shorten the induction time of hydrate nucleation, reduce the formation rate, and influence the dissociation behavior by improving the homogeneous distribution of gas hydrate in pores.
Article
Energy & Fuels
Xiao-Yan Li, Jing-Chun Feng, Xiao-Sen Li, Yi Wang, Heng-Qi Hu
Summary: The formation of gas hydrate in deposit is predominantly determined by the mass transport rate, while the heat transfer mainly affects the dissociation of methane hydrate. The critical hydrate saturation, defined as 50-80% of the initial hydrate saturation, plays a significant role in gas hydrate resource prospecting and production risk assessment.
Article
Thermodynamics
Xuan Kou, Jing-Chun Feng, Xiao-Sen Li, Yi Wang, Zhao-Yang Chen
Summary: This study investigates the interactions between hydrate decomposition and heat/mass transfer from the perspective of hydrate morphology at different scales, revealing that mass transfer significantly influences the evolution of hydrate morphology, especially the gas mass transfer leading to the transition from patchy pore-filling to grain-bridging. The concept of hydrate bridges is introduced to describe the combination of grain-bridging hydrate and water layer wrapping the hydrate.
Article
Energy & Fuels
Ya-Ting Xu, Yi Wang, Xiao-Sen Li, Xiao-Yan Li, Gang Li, Fu-Cheng Deng
Summary: This study investigates the sand production behaviors in methane hydrate reservoirs with different particle size quartz sands through experiments and analysis. The relationship between the particle size and reservoir damage is also explored. The experimental results show that there is a certain particle size that is beneficial for particle migration, and the reservoir particle size is positively correlated with the amount of sand production. Moreover, based on the different particle sizes, optimization recommendations for the wellbore position are proposed to avoid sand production.
Article
Thermodynamics
Xuan Kou, Xiao-Sen Li, Yi Wang, Zhao-Yang Chen
Summary: This study investigates the dynamic evolution of the macro and micro-scale decomposition front of natural gas hydrates using X-ray computed tomography (X-CT). The findings reveal that the decomposition front is not only the boundary where hydrates are completely decomposed but also plays important roles in geological stability and ecological environment protection.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Engineering, Marine
Yan Xie, Jingchun Feng, Liwei Sun, Junwen Wang, Weiqiang Hu, Bo Peng, Yujun Wang, Yi Wang
Summary: Methane leakage is a significant challenge in the exploitation of natural gas hydrates, and the mechanism and controlling factors of methane leakage during the hydrate dissociation process are still unclear. This study developed a coupled simulator that can simulate the exploitation of methane hydrates and simulate methane leakage, providing assistance in developing safe exploitation strategies.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Yan Xie, Jingchun Feng, Weiqiang Hu, Mingrui Zhang, Junwen Wang, Bo Peng, Yujun Wang, Zhenwu Zhou, Yi Wang
Summary: The study presented the development of a deep-sea sediment and water simulator to investigate the methane seeping and hydrate formation. The simulator can mimic the deep-sea environment and monitor the bubble migration path and hydrate transformation through electric resistance and temperature variations. It also allows for quantifying the storage and escape of CH4 gas. The addition of a movable biological liquid injection port enables the investigation of methane conversion processes. Experimental tests confirmed the effectiveness of the device.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Changwen Xiao, Xiaosen Li, Qiunan Lv, Yang Yu, Jianxing Yu, Gang Li, Pengfei Shen
Summary: In this study, it was found that the presence of methane hydrate significantly decreased the permeability of glass beads and the gas produced by hydrate dissociation reduced the resistance of fluid flow in pores. A clustered equal diameter particle model was proposed and fitted well with the experimental results, revealing the significant effect of bead and hydrate particle size on the permeability.
Article
Engineering, Chemical
Yu Zhang, Jing Cai, Xiao-Sen Li, Zhao-Yang Chen, Gang Li
Summary: The effect of particle size of porous media on CO2 hydrate formation was investigated by conducting formation experiments in three different-sized porous media. The experiments utilized three different porous media with mean particle diameters of 2.30 μm (clay level), 5.54 μm (silty sand level), and 229.90 μm (fine sand level). The results showed that the final gas consumption increased with higher initial pressure and lower formation temperature. Hydrate formation in the 229.90 μm porous media at an initial pressure of 4.8 MPa was slower and displayed multiple stages. The gas consumption rate was lowest at a temperature of 279.15 K. The particle size did not affect the final gas consumption, but it did affect the formation rates, with smaller media sizes having faster rates. The gas consumption rate per mol of water and final water conversion increased with decreasing water content. The presence of NaCl increased the induction time and decreased the final water conversion in the 5.54 μm porous media.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Energy & Fuels
Qiu-Nan Lv, Kai Zhang, Xiao-Sen Li, Gang Li
Summary: In this study, the formation process of cyclopentane-methane binary hydrates was investigated using in situ Raman spectroscopy. It was found that the methane molecules were encapsulated in small cages, while the cyclopentane molecules were encapsulated in large cages in the sII-type hydrates. This structure facilitated the nucleation rate of hydrates, and the calculated hydration number was 12.6.
Article
Energy & Fuels
Gang Li, Xiao-Sen Li, Qiu-Nan Lv, Chang-Wen Xiao, Fu-Cheng Deng
Summary: China conducted an offshore gas production test in the Shenhu Area of the South China Sea in 2020, with the goal of evaluating the potential of the hydrate deposits in the area. The test used a novel numerical simulation code to develop a mathematical model and replicate the field test in a marine hydrate reservoir. The results of the simulation showed that the current technology is not attractive for gas production from the hydrate deposits in this area, due to limited gas saturation and low temperature. The study recommends future geological surveys to focus on finding hydrate reservoirs with high gas saturation and large gas effective permeability, and suggests using thermal-assisted depressurization as a potential strategy for gas recovery from marine hydrate reservoirs.
Article
Energy & Fuels
Ya-Ting Xu, Yi Wang, Xiao-Sen Li, Xiao-Yan Li, Gang Li, Fu-Cheng Deng
Summary: The characteristics of hydrate-bearing sediments make the production of natural gas hydrates difficult. This study investigated sand production behaviors in methane hydrate reservoirs with different particle size quartz sands and found that particle size has an impact on particle migration.
Review
Energy & Fuels
Fucheng Deng, Bin Huang, Xiaosen Li, Jianwu Liu, Gang Li, Yating Xu, Biao Yin
Summary: This review evaluates recent research advances in sand control for hydrate production, summarizes the mechanical characteristics and dynamic response of hydrate sediment, and proposes a comprehensive consideration of various factors in sand control design and sand production mechanism.
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.
