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
Xiao-Yan Li, Kun Wan, Yi Wang, Xiao-Sen Li
Summary: The study investigates the effects of soaking time on the dissociation behavior, gas-to-water ratio, and energy efficiency in the periodic depressurization and hot water injection method for gas hydrates production. The results show that reducing the soaking time improves the dissociation rate but decreases the thermal and energy efficiency, which is detrimental to hydrate 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, Environmental
Mengya Niu, Yuanxin Yao, Zhenyuan Yin, Kai Liu, Peiming Bian, Mucong Zi, Daoyi Chen
Summary: Combining CH4 recovery with CO2 storage in marine natural gas hydrate (NGH) reservoirs is a promising carbon-neutral technology. The study found that reducing bottom hole pressure (BHP) can increase CH4 recovery ratio and CH4 production rate. Mix-H formation starts in the upper section and propagates downward after CO2/N2 injection. The use of a horizontal wellbore (HW) facilitates a more even distribution of CO2/N2, resulting in a higher CO2 composition in Mix-H.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Jing-Chun Feng, Bo Li, Xiao-Sen Li, Yi Wang
Summary: The study found that increasing depressurizing rate leads to a decrease in gas production rate, but increasing depressurizing rate is beneficial for hydrate reformation during this period. The optimal depressurizing rate is obtained when the fluid velocity is in accordance with the heat transfer vector in the hydrate reservoir.
Article
Energy & Fuels
Lei Xu, Kangji Shi, Xin Lv, Rupeng Wei, Qi Fan, Qingping Li, Hongsheng Dong, Jiafei Zhao, Lei Yang
Summary: Extracting natural gas from marine hydrate reservoir is a complex geological process, with the early stage of hydrate dissociation being influenced by initial pressure propagation. Subsequent dissociation is mainly controlled by heat supply and temperature distribution. Stepwise depressurization can help ensure stable production rate.
Article
Engineering, Marine
Hongyu Ye, Xuezhen Wu, Gaoqiang Guo, Dayong Li, Yujing Jiang
Summary: A novel heat transfer device (HTD) was proposed to alleviate the low temperature problem during natural gas hydrate (NGH) dissociation. The HTD utilizes the geothermal gradient to raise temperature and prevent blockage caused by ice and NGH regeneration. The device can improve gas production efficiency under depressurization method without external energy injection.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Kun Wan, Xiao-Sen Li, Yi Wang, Xiao-Yan Li, Xuan Kou, Heng-Qi Hu, Yu Zhang
Summary: In this study, a pilot-scale hydrate simulator with an effective volume of 117.8 L was used for the first time to investigate multifield coupling and heterogeneity during hydrate dissociation. The results show that hydrate decomposition is heterogeneous, with the most abundant hydrates in the middle of the lower layer and the longest decomposition time in the lower layer.
Article
Energy & Fuels
Guobiao Zhang, Youhong Sun, Bing Li, Yifeng Shen, Yun Qi
Summary: Research has found that in the dissociation of mixed hydrates, CH4 and C2H6 are preferentially released over C3H8. Gas sweep method can continue the decomposition of mixed hydrates and recover more C3H8 at the beginning. The formation and decomposition of the C3H8-rich hydrate shell may control the decomposition rate of mixed hydrates.
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
Thermodynamics
Xiao-Yan Li, Xiao-Sen Li, Yi Wang, Jian-Wu Liu, Heng-Qi Hu
Summary: Water saturation significantly affects the dissociation of gas hydrates in sediments of different particle sizes, with an optimum water saturation existing for maximum dissociation rate. The results can provide guidance for production methods in different types of hydrate reservoirs.
Article
Engineering, Environmental
Lunxiang Zhang, Hongsheng Dong, Sheng Dai, Yangmin Kuang, Lei Yang, Jiaqi Wang, Jiafei Zhao, Yongchen Song
Summary: Depressurization is considered the most promising technique for hydrate exploitation, but excessive water production during the exploitation of hydrate accumulations poses challenges. Water management is crucial for gas recovery from different types of hydrate accumulations. Synthetic hydrate samples were used to simulate natural methane hydrate sediments, and MRI imaging was employed to characterize water performance and methane recovery. The study suggests that an optimized depressurization approach can improve methane recovery.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Thermodynamics
Yongchang Feng, Lin Chen, Yuki Kanda, Anna Suzuki, Atsuki Komiya, Shigenao Maruyama
Summary: Artificial fractures in methane hydrate reservoirs can significantly improve hydrate dissociation and gas production efficiency, particularly in the early depressurization stage. Higher fracture permeability may shorten the economical production stage but lead to higher production rates. Furthermore, fractures facilitate the flow of hot water into the sediment, enhancing production efficiency during the economical production stage.
Article
Thermodynamics
Bingbing Chen, Zheyuan Liu, Huiru Sun, Guojun Zhao, Xiang Sun, Mingjun Yang
Summary: The study comprehensively analyzed the effects of temperature, salinity, pressure, and fluid flow on MH decomposition characteristics using MRI, showing that pressure, salinity, temperature, and water flow synergistically increase MH decomposition efficiency, with water flow rate and heat transfer being crucial factors for accelerating decomposition.
Article
Energy & Fuels
Qing-Cui Wan, Zhenyuan Yin, Qiang Gao, Hu Si, Bo Li, Praveen Linga
Summary: Driven by large resource volume, extraction of CH4 from hydrate reservoirs has attracted global attention. Depressurization is considered a feasible method, but the fluid production behavior from water-saturated hydrate-bearing sediments below the quadruple point of CH4 + H2O still needs further investigation. Experiment results show that ice formation affects temperature response, but does not significantly impact gas production. Higher hydrate phase saturation improves gas production rate and final recovery ratio, indicating ultra-deep depressurization as a viable option for enhancing CH4 recovery.
Article
Thermodynamics
Xiao-Yan Li, Xiao-Sen Li, Yi Wang, Jian-Wu Liu, Heng-Qi Hu
Summary: Water saturation significantly affects the dissociation of gas hydrates in sediments of different particle sizes, with an optimum water saturation existing for maximum dissociation rate. The results can provide guidance for production methods in different types of hydrate reservoirs.
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
Lijia Li, Xiaosen Li, Yi Wang, Chaozhong Qin, Bo Li, Yongjiang Luo, Jingchun Feng
Summary: Natural gas hydrate has potential for alternative energy, but its decomposition may lead to reservoir deformation and geological hazards. A fully coupled THMC model was established to investigate the influence of sediment deformation on gas production from hydrate-bearing sediments. Results showed that the mechanical coupling model resulted in a longer gas production time and increased water production compared to the mechanical uncoupled model.
Article
Energy & Fuels
Xiao-Yan Li, Xiao-Sen Li, Yi Wang, Gang Li, Yu Zhang, Heng-Qi Hu, Kun Wan, Hao-Peng Zeng
Summary: The study demonstrates that particle size affects the formation and dissociation rates of gas hydrates, with coarser particles being more advantageous for production. Two stages are involved in the formation process, with smaller particles leading to shorter nucleation induction times and faster formation rates.
Article
Thermodynamics
Xuan Kou, Xiao-Sen Li, Yi Wang, Kun Wan, Zhao-Yang Chen
Summary: In this study, gas hydrate with different growth habits was synthesized in quartz sands porous media, and a modified permeability reduction model based on interconnectivity degree was proposed to estimate the permeability variation of hydrate bearing porous media. Experimental results showed that the formation and growth of gas hydrate in pores led to non-interconnected pores, limiting the validity of pore structure analysis. The modified model displayed good prediction performance for permeability estimation in gas production from hydrate-bearing sediments.
Article
Energy & Fuels
Jian-Wu Liu, Xiao-Sen Li, Xuan Kou, Yi Wang, Li-Jia Li
Summary: The study showed that the heterogeneity of hydrate distribution significantly affects the mechanical parameters of hydrate-bearing sediments, including elastic modulus, shear strength, and dilation. Anisotropy of the hydrate heterogeneous distribution effect was also observed. Considering the impact of hydrate distribution heterogeneity is essential when characterizing the mechanical properties of GHBS.
Article
Energy & Fuels
Xiao-Yan Li, Xiao-Sen Li, Yi Wang, Yu Zhang, Kun Wan, Hao-Peng Zeng
Summary: The study revealed that hydrate dissociation rates were similar in hydrate simulators of different scales. Normalized dissociation rates can be used to predict hydrate dissociation rates in different simulators.
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
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.
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.