Article
Thermodynamics
Xiaoya Zang, Jing Wang, Yong He, Xuebing Zhou, Deqing Liang
Summary: This study examined the formation kinetics of ternary gas mixture hydrates using synthesized cyclopentane and sodium dodecyl sulfate as additives. The results showed that the use of mixed additives can promote hydrate formation and enhance gas separation under specific conditions. Increasing the concentration of sodium dodecyl sulfate can smoothen the hydrate crystal surface, resulting in more complete crystallization.
Article
Energy & Fuels
Meku Maruyama, Shun Kao, Hitoshi Kiyokawa, Satoshi Takeya, Ryo Ohmura
Summary: In this study, clathrate-hydrate-based continuous CO2 capture was experimentally investigated, and it was found that the CO2 concentration rate and recovery ratio were lower compared to pre-combustion systems. However, it was revealed that improving the geometry of mixing impellers could enhance the CO2 recovery ratio for continuous operation.
Article
Engineering, Chemical
Nayla Lozada Garcia, Daniela S. Damaceno, Lucidio C. Fardelone, Adriano Ferreira de Mattos Silvares, Joao Pedro Ferreira Del Pintorc, Afonso Henrique Teixeira Mendes, Marcelo F. Costa, Jose Carlos B. Lopes, Song Won Park, Jose Roberto Nunhez
Summary: A scalable continuous process for obtaining CO2 hydrates with high heat removal capacity is proposed. Experimental results show that the process can rapidly form high-concentration hydrates and has higher gas uptake compared to batch systems. The process has the potential to be an effective alternative for CO2 sequestration due to its superior heat removal and mass transfer capabilities.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Energy & Fuels
Yingmei Wang, Aili Niu, Wenze Jiao, Ji Chen, Peng Zhang, Jinping Li
Summary: Carbon dioxide hydrate formation rate is improved by using different accelerator systems. The combination of nanographite-TBAB and SDS-TBAB shows better performance in reducing the nucleation time. TBAB shows the best nucleation amount, formation rate, and conversion rate among the single acceleration systems.
Article
Multidisciplinary Sciences
Shubhangi Srivastava, Ann Mary Kollemparembil, Viktoria Zettel, Timo Classen, Bernhard Gatternig, Antonio Delgado, Bernd Hitzmann
Summary: The dissociation of CO2 gas hydrates with amino acid and surfactant promoters was studied, and it was found that leucine and lecithin are effective promoters for enhancing CO2 uptake and stability in gas hydrate formation.
SCIENTIFIC REPORTS
(2022)
Article
Engineering, Chemical
Ryosuke Ezure, Yuma Arai, Daiki Nakano, Hiroyuki Komatsu, Hideo Tajima
Summary: Hydrate-based gas separation is a method of separating gas mixtures based on their thermodynamic properties. This study proposes a new process for gas absorption and desorption under constant pressure with rising temperature. Theoretical calculations and experimental verification showed that SF6 can be concentrated up to 90% using this process.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Energy & Fuels
Iqbal Ahmed, Omar Bamaga, Mohammed Hussain Albeirutty, Hani Abulkhair, Abdulmohsen Alsaiari, Hussam Organji, Praveen Linga
Summary: The kinetics and morphology of methane gas clathrate hydrate formation were studied under low pressure, temperature, and low stirring speeds. The use of low stirring mode (LSM) resulted in shorter formation time, enhanced stability of the hydrate, and improved diffusion rate of methane within the solvent phases. Four distinct morphological characteristics of the hydrate were observed under LSM conditions.
Article
Chemistry, Multidisciplinary
Nkululeko Nkosi, Diakanua Nkazi, Kaniki Tumba
Summary: One of the challenges faced by the fruit juice industry is the increasing energy costs. This study explores the use of hydrate-based juice concentration technology as an environmentally friendly and cost-effective solution. Experimental data shows that reducing the water content in the juice shifts the hydrate phase equilibrium conditions. The study concludes that hydrate-based fruit juice concentration technology is a viable alternative to current commercial technologies.
Article
Thermodynamics
Qiang Zhang, Junjie Zheng, Baoyong Zhang, Praveen Linga
Summary: Coalbed methane recovery is crucial for coal mine safety, reducing greenhouse gas emissions, and economic benefits. Gas hydrate technology can effectively separate CH4 from N2-rich coal mine gas. The synergistic effect of sII hydrate promoters and amino acids was examined for enhancing hydrate formation kinetics, separation performance, and CH4 recovery. Amino acids showed significant promotion effects, particularly for the propane system, and improved kinetics by over 10 times. CP-amino acid systems demonstrated excellent separation performance, increasing CH4 content from 30% to 70%. THF-amino acid systems achieved the highest CH4 recovery of up to 50.27%. The impact of amino acids varied depending on the system, and two possible mechanisms, including interfacial tension alteration and amino acid hydrophobicity, were discussed. These insights provide a basis for optimizing the hydrate process for coalbed methane recovery and other applications.
Article
Thermodynamics
Peng Xiao, Bao-Can Dong, Jia Li, Hong-Liang Zhang, Guang-Jin Chen, Xing Huang
Summary: In this study, the filtration of hydrate particles from hydrate slurries, which is a crucial step for continuous hydrate production, was investigated. The specific resistances of the hydrate cakes formed under different pressure drops were measured. It was found that increasing pressure drop led to an increase in specific resistance, particularly in the second stage. An approach involving filtration mediums, additives, and pressure drops was proposed for efficient filtration of hydrate slurries, and a continuous hydrate production process was suggested based on the results.
Article
Chemistry, Multidisciplinary
Ruirui Wang, Hang Zhou, Baoya Yang, Weilong Zhao, Jun Song, Haikun Zheng, Xiaoru Hao, Wei Sheng
Summary: This paper studies the promotion effects of graphene oxide (GO) and recovered graphene oxide (Re-GO) on methane hydrate in different systems. The results show that GO has excellent kinetic and thermodynamic promotion effects on CH4 hydrate generation. The research provides essential data and an experimental basis for the application of graphene oxide and hydrate technology in energy storage and cold storage.
Article
Energy & Fuels
Zihua Shao, Jintang Wang, Kaihe Lv, Bo Liao, Zonglun Wang, Yujing Bai, Ren Wang, Jinsheng Sun
Summary: A new type of hydrate dissociation inhibitor was studied using both experimental and molecular dynamics methods. The experimental results showed that this zwitterionic compound had an inhibitory effect on hydrate dissociation, and a kinetic model was validated using the experimental data. Molecular dynamics simulations revealed that the charged functional groups improved the interaction between the inhibitor and methane hydrate, and the sulfonate group had a strong hydration ability that affected the distribution of water molecules in the water phase.
Article
Energy & Fuels
Vyacheslav G. Smirnov, Andrey Y. Manakov, Zinfer R. Ismagilov
Summary: A new equation describing the equilibrium conditions for gas hydrate in thin pores of mesoporous materials is proposed in this study. The equation takes into account the size of hydrate particles together with the chemical potential of pore water in equilibrium with the hydrate. The modeling results are in reasonable qualitative agreement with the experimental data.
Article
Energy & Fuels
Xiang Liu, Jialu Zhang, Yuxing Li, Yuanxing Ning, Zhiming Liu, Guangchun Song, Wuchang Wang
Summary: This study investigated the growth characteristics of hydrate in a gas-water system through experiments, and found that the integrity of liquid film and sudden transformation of water layer into hydrate deposits are important factors affecting gas phase and bulk hydrate formation. The growth of gas-phase hydrate deposition can be divided into two stages: wall formation and film growth.
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
Energy & Fuels
Jia-nan Zheng, Xinru Wang, Zhanquan Ma, Mingjun Yang
Summary: This study investigated the production process of water-saturated marine methane hydrate deposits through depressurization and compensation, revealing three stages of release, equilibrium, and free, and an additional compensation stage during water injection. The effective temperature increase based on the phase equilibrium temperature was confirmed to be the deciding factor of decomposition rate of hydrates in the equilibrium stage. Additionally, gas/water production of water-saturated hydrate deposits is jointly controlled by water injection and hydrate decomposition.
Article
Energy & Fuels
Bingbing Chen, Huiru Sun, Guojun Zhao, Bin Wang, Yuechao Zhao, Mingjun Yang
Summary: Water flow erosion has been found to be an effective method for methane hydrate dissociation, which helps mitigate ice generation issues in depressurization production. The combination of three depressurization modes with water flow erosion effectively eliminates ice generated during methane hydrate production, with higher water flow rates enhancing the dissociation process.
Article
Energy & Fuels
Shihui Ma, Jia-nan Zheng, Jie Zhao, Mingjun Yang, Yongchen Song
Summary: The solid fluidization exploitation method is a new approach for extracting marine methane hydrate, with thermodynamic stability and methane leakage being key factors. The study found that the process can be divided into pressure control, concentration control, and equilibrium control stages, and that the filling rate of the methane hydrate structure affects stability and decomposition. The study also showed that the fluidization rate affects decomposition and methane leakage, with higher temperatures leading to increased methane leakage.
Article
Chemistry, Physical
Kehan Li, Bingbing Chen, Mingjun Yang, Yongchen Song, Lanlan Jiang
Summary: This study found that introducing an electric field into methane hydrates in NaCl solution can significantly enhance the inhibitory effect of the electric field, as the field can drive salt ions into the hydrate layer to form temporary structures. These structures are unstable, allowing ions to easily migrate and cause structural breakdown.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Thermodynamics
Shuang Dong, Mingjun Yang, Mingkun Chen, Jia-nan Zheng, Yongchen Song
Summary: This study investigated the temperature response mechanism during methane hydrate production by depressurization. It was found that the temperature decreases with the progress of depressurization and accelerates as the hydrates start to dissociate. The pressure and temperature trajectories are parallel to the hydrate phase equilibrium line at the highest dissociation rate, forming a stationary state of hydrate dissociation.
Article
Energy & Fuels
Mingjun Yang, Xuehan Wang, Jing Li, Jia-nan Zheng, Lanlan Jiang
Summary: Gas hydrate-based technology shows great potential for seawater desalination and gas storage. This study found that the size of sand particles significantly affects the growth rate and amount of hydrates. By mixing sands of different sizes, the kinetics of hydrate growth can be improved, with mixed sands in the range of 0.2-0.4 mm diameter suggested as optimal porous media for propane hydrate-based desalination.
Article
Energy & Fuels
Jia-nan Zheng, Jie Zhao, Huiquan Liu, Mingjun Yang, Xin Xin
Summary: This study conducted experimental simulations on the production of marine natural gas hydrate (NGH) using real marine sediments. The study developed a method of remolding NGH sediments by injecting water into dry sediments and forming hydrates. The production characteristics of different moisture levels of NGH sediments were evaluated, and the complex response of sediment temperatures to pressure change, hydrate decomposition, heat transfer, and ice formation and melting were analyzed. The results have great significance for future pilot production of real marine NGH.
Review
Energy & Fuels
Guojun Zhao, Guangjun Gong, Huiru Sun, Bingbing Chen, Jia-nan Zheng, Mingjun Yang
Summary: This article discusses the calculation of methane solubility in gas-water and hydrate-water equilibrium systems, describes the parameters used in the calculation process, and reveals the influences of bubbles, capillary pressure, and salt on methane solubility. A novel hydrate exploitation method, which combines depressurization and water injection, is proposed.
Article
Thermodynamics
Huiru Sun, Bingbing Chen, Kehan Li, Yongchen Song, Mingjun Yang, Lanlan Jiang, Jinyue Yan
Summary: This study analyzes the factors influencing hydrate re-formation characteristics by simulating two-phase flow in hydrate sediment. The results show that temperature and pressure exhibit three stages of change in the water-dominated two-phase flow process. A lower effective sectional velocity of water enhances the hydrate re-formation process. Meanwhile, the gas phase impedes mass transfer on the water-hydrate interface and acts as a nucleation site to promote hydrate re-formation. The onset time of flow blockage is linearly positively correlated with the effective sectional velocity of water, but the amount of hydrate re-formation decreases with increasing velocity.
Article
Thermodynamics
Mengru Tian, Yongchen Song, Jia-nan Zheng, Guangjun Gong, Mingjun Yang
Summary: This study simulated methane hydrate sediment with a temperature gradient and found that the temperature gradient affects the formation and dissociation of hydrates. The results of this study are significant for improving the efficiency of methane hydrate exploitation.
Article
Energy & Fuels
Shuang Dong, Yongchen Song, Weixin Pang, Jie Zhao, Jia-nan Zheng, Mingjun Yang
Summary: This study investigates the pressure regulation process of methane hydrate production and finds that the decomposition rate of methane hydrates is time-invariant and shows a non-equilibrium state under pressure-temperature conditions. The results demonstrate the positive effects of dynamic depressurization and gas flux on the decomposition rate of methane hydrates, and reveal that increasing the depressurization rate is more effective than increasing the pressure itself in promoting hydrate decomposition.
Article
Chemistry, Physical
Bingbing Chen, Kehan Li, Huiru Sun, Lanlan Jiang, Mingjun Yang, Yongchen Song
Summary: In this study, a new method of hydrate dissociation using seawater and electrostatic fields cooperatively (SE method) was proposed. Molecular dynamics simulations were used to investigate the thermodynamic properties and structural changes of methane hydrate in multiple salt solutions under an electrostatic field. The results showed that the electric field can drive cations into the hydrate phase, accelerating hydrate dissociation.
JOURNAL OF PHYSICAL CHEMISTRY B
(2023)
Article
Energy & Fuels
Tao Yu, Bingbing Chen, Lanlan Jiang, Lunxiang Zhang, Lei Yang, Mingjun Yang, Yongchen Song, Abuliti Abudula
Summary: A new approach of seawater flooding was proposed for offshore natural gas hydrate exploitation and its feasibility was evaluated numerically. Two artificial means of well location rearrangement and hydraulic fracturing, as well as their combination, were proposed to enhance gas production from offshore NGH deposits. Simulation results showed that seawater flooding had advantages over depressurization and could promote hydrate dissociation, prevent secondary hydrate formation, and facilitate gas production. The combination of well location rearrangement and hydraulic fracturing further enhanced hydrate dissociation and gas recovery, demonstrating great superiority over using these methods alone. The newly proposed approach can be applied in future commercial offshore NGH development.
Article
Energy & Fuels
Mengru Tian, Yongchen Song, Weixin Pang, Jia-nan Zheng, Shuang Dong, Mingjun Yang
Summary: High-efficient decomposition is crucial for commercial production of methane hydrates. This study found that hydrate decomposition is influenced by complex heat and mass transfer, including icing and melting. The research also revealed that the temperature and pressure relationship during hydrate decomposition can lead to rapid icing and pressure rise, reaching up to 2.36 MPa.
Article
Chemistry, Physical
Kehan Li, Bingbing Chen, Mingjun Li, Lanlan Jiang, Yongchen Song, Mingjun Yang
Summary: This study investigates the effects of different anion solutions on methane hydrates under an electric field through molecular dynamics simulations. The presence of anions enhances the instability of methane hydrates and leads to a staged dissociation process.
JOURNAL OF PHYSICAL CHEMISTRY B
(2023)
Article
Energy & Fuels
Shitong Fang, Houfan Du, Tao Yan, Keyu Chen, Zhiyuan Li, Xiaoqing Ma, Zhihui Lai, Shengxi Zhou
Summary: This paper proposes a new type of nonlinear VIV energy harvester (ANVEH) that compensates for the decrease in peak energy output at low wind speeds by introducing an auxiliary structure. Theoretical and experimental results show that ANVEH performs better than traditional nonlinear VIV energy harvesters under various system parameter variations.
Article
Energy & Fuels
Wei Jiang, Shuo Zhang, Teng Wang, Yufei Zhang, Aimin Sha, Jingjing Xiao, Dongdong Yuan
Summary: A standardized method was developed to evaluate the availability of solar energy resources in road areas, which combined the Analytic Hierarchy Process (AHP) and the Geographic Information System (GIS). By analyzing critical factors and using a multi-indicator evaluation method, the method accurately evaluated the utilization of solar energy resources and guided the optimal location selection for road photovoltaic (PV) projects. The results provided guidance for the application of road PV projects and site selection for route corridors worldwide, promoting the integration of transportation and energy.
Article
Energy & Fuels
Chang Liu, Jacob A. Wrubel, Elliot Padgett, Guido Bender
Summary: The study investigates the effects of coating defects on the performance of the anode porous transport layer (PTL) in water electrolyzers. The results show that an increasing fraction of uncoated regions on the PTL leads to decreased cell performance, with continuous uncoated regions having a more severe impact compared to multiple thin uncoated strips.
Article
Energy & Fuels
Marcos Tostado-Veliz, Xiaolong Jin, Rohit Bhakar, Francisco Jurado
Summary: In this paper, a coordinated charging price mechanism for clusters of parking lots is proposed. The research shows that enabling vehicle-to-grid characteristics can bring significant economic benefits for users and the cluster coordinator, and vehicle-to-grid impacts noticeably on the risk-averse character of the uncertainty-aware strategies. The developed pricing mechanism can reduce the cost for users, avoiding to directly translate the energy cost to charging points.
Article
Energy & Fuels
Duan Kang
Summary: Building an energy superpower is a key strategy for China and a long-term goal for other countries. This study proposes an evaluation system and index for measuring energy superpower, and finds that China has significantly improved its ranking over the past 21 years, surpassing other countries.
Article
Energy & Fuels
Fucheng Deng, Yifei Wang, Xiaosen Li, Gang Li, Yi Wang, Bin Huang
Summary: This study investigated the synergistic blockage mechanism of sand and hydrate in gravel filling layer and the evolution of permeability in the layer. Experimental models and modified permeability models were established to analyze the effects of sand particles and hydrate formation on permeability. The study provided valuable insights for the safe and efficient exploitation of hydrate reservoirs.
Article
Energy & Fuels
Hao Wang, Xiwen Chen, Natan Vital, Edward Duffy, Abolfazl Razi
Summary: This study proposes a HVAC energy optimization model based on deep reinforcement learning algorithm. It achieves 37% energy savings and ensures thermal comfort for open office buildings. The model has a low complexity, uses a few controllable factors, and has a short training time with good generalizability.
Article
Energy & Fuels
Moyue Cong, Yongzhuo Gao, Weidong Wang, Long He, Xiwang Mao, Yi Long, Wei Dong
Summary: This study introduces a multi-strategy ultra-wideband energy harvesting device that achieves high power output without the need for external power input. By utilizing asymmetry, stagger array, magnetic coupling, and nonlinearity strategies, the device maintains a stable output voltage and high power density output at non-resonant frequencies. Temperature and humidity monitoring are performed using Bluetooth sensors to adaptively assess the device.
Article
Energy & Fuels
Tianshu Dong, Xiudong Duan, Yuanyuan Huang, Danji Huang, Yingdong Luo, Ziyu Liu, Xiaomeng Ai, Jiakun Fang, Chaolong Song
Summary: Electrochemical water splitting is crucial for hydrogen production, and improving the hydrogen separation rate from the electrode is essential for enhancing water electrolyzer performance. However, issues such as air bubble adhesion to the electrode plate hinder the process. Therefore, a methodology to investigate the two-phase flow within the electrolyzer is in high demand. This study proposes using a microfluidic system as a simulator for the electrolyzer and optimizing the two-phase flow by manipulating the micro-structure of the flow.
Article
Energy & Fuels
Shuo Han, Yifan Yuan, Mengjiao He, Ziwen Zhao, Beibei Xu, Diyi Chen, Jakub Jurasz
Summary: Giving full play to the flexibility of hydropower and integrating more variable renewable energy is of great significance for accelerating the transformation of China's power energy system. This study proposes a novel day-ahead scheduling model that considers the flexibility limited by irregular vibration zones (VZs) and the probability of flexibility shortage in a hydropower-variable renewable energy hybrid generation system. The model is applied to a real hydropower station and effectively improves the flexibility supply capacity of hydropower, especially during heavy load demand in flood season.
Article
Energy & Fuels
Zhen Wang, Kangqi Fan, Shizhong Zhao, Shuxin Wu, Xuan Zhang, Kangjia Zhai, Zhiqi Li, Hua He
Summary: This study developed a high-performance rotary energy harvester (AI-REH) inspired by archery, which efficiently accumulates and releases ultralow-frequency vibration energy. By utilizing a magnetic coupling strategy and an accumulator spring, the AI-REH achieves significantly accelerated rotor speeds and enhanced electric outputs.
Article
Energy & Fuels
Yi Yang, Qianyi Xing, Kang Wang, Caihong Li, Jianzhou Wang, Xiaojia Huang
Summary: In this study, a novel hybrid Quantile Regression (QR) model is proposed for Probabilistic Load Forecasting (PLF). The model integrates causal dilated convolution, residual connection, and Bidirectional Long Short-Term Memory (BiLSTM) for multi-scale feature extraction. In addition, a Combined Probabilistic Load Forecasting System (CPLFS) is proposed to overcome the inherent flaws of relying on a single model. Simulation results show that the hybrid QR outperforms traditional models and CPLFS exceeds the best benchmarks in terms of prediction accuracy and stability.
Article
Energy & Fuels
Wen-Jiang Zou, Young-Bae Kim, Seunghun Jung
Summary: This paper proposes a dynamic prediction model for capacity fade in vanadium redox flow batteries (VRFBs). The model accurately predicts changes in electrolyte volume and capacity fade, enhancing the competitiveness of VRFBs in energy storage applications.
Article
Energy & Fuels
Yuechao Ma, Shengtie Wang, Guangchen Liu, Guizhen Tian, Jianwei Zhang, Ruiming Liu
Summary: This paper focuses on the balance of state of charge (SOC) among multiple battery energy storage units (MBESUs) and bus voltage balance in an islanded bipolar DC microgrid. A SOC automatic balancing strategy is proposed considering the energy flow relationship and utilizing the adaptive virtual resistance algorithm. The simulation results demonstrate the effectiveness of the proposed strategy in achieving SOC balancing and decreasing bus voltage unbalance.
Article
Energy & Fuels
Raad Z. Homod, Basil Sh. Munahi, Hayder Ibrahim Mohammed, Musatafa Abbas Abbood Albadr, Aissa Abderrahmane, Jasim M. Mahdi, Mohamed Bechir Ben Hamida, Bilal Naji Alhasnawi, A. S. Albahri, Hussein Togun, Umar F. Alqsair, Zaher Mundher Yaseen
Summary: In this study, the control problem of the multiple-boiler system (MBS) is formulated as a dynamic Markov decision process and a deep clustering reinforcement learning approach is applied to obtain the optimal control policy. The proposed strategy, based on bang-bang action, shows superior response and achieves more than 32% energy saving compared to conventional fixed parameter controllers under dynamic indoor/outdoor actual conditions.