Review
Energy & Fuels
Phakamile Ndlovu, Saeideh Babaee, Paramespri Naidoo
Summary: This article reviews the encapsulation process of carbon dioxide by replacing methane from natural gas hydrates, presenting and discussing methane-carbon dioxide replacement models. The variables affecting the replacement process and reported theoretical findings are reviewed, along with the challenges and limitations. The fundamentals of hydrate formation mechanisms on porous media are also detailed, and a comprehensive discussion and comparison of experimental studies involving different porous media materials and various additives are presented.
Article
Engineering, Environmental
Mengya Niu, Zhenyuan Yin, Yifei Sun, Wei Fang, Guangjin Chen, Daoyi Chen
Summary: This study investigates the impact of key factors in the depressurization process on the formation of mixed hydrates, CO2 sequestration, and hydrate restoration. The results show that increasing CH4 production decreases CO2 sequestration and hydrate restoration.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Tian Wang, Lingjie Sun, Ziyu Fan, Rupeng Wei, Qingping Li, Haiyuan Yao, Hongsheng Dong, Lunxiang Zhang, Lei Yang, Jiafei Zhao, Yongchen Song
Summary: CH4/CO2 replacement for NGHs exploitation is a promising method for CO2 geological sequestration and energy recovery. However, low replacement efficiency and slow reaction rate are fatal bottlenecks for its field application. To solve this problem, a method using warm brine injection is proposed to enhance CH4 recovery and CO2 storage. This method provides three dimensionally connected channels in hydrate for mass transfer, improving CH4/CO2 replacement. The CO2 sequestration efficiency of this method reaches 76.46%, and the maximum amount of CH4 recovery is nearly three times than that of the single CO2 replacement method. However, potential risk of secondary hydrate formation could be alleviated by increasing salinity.
CHEMICAL ENGINEERING JOURNAL
(2023)
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
Energy & Fuels
Yingfei Wang, Bo Dong, Ping Wang, Lunxiang Zhang, Cong Chen, Yan Qin, Yang Liu, Weizhong Li, Yongchen Song
Summary: This study develops a model to investigate the effects of initial water on CO2-CH4 dynamic replacement in a hydrate in a pore network, and validates the model with a previous experiment. The results show that the presence of initial water leads to a faster carbon dioxide displacement, weaker methane hydrate dissociation, more pure carbon dioxide hydrate formation, similar mixed hydrate generation, and a lower exchange rate. The exchange reaction starts at the edges of hydrate distribution areas and progresses towards the inside.
Article
Thermodynamics
Jing-Yu Kan, Yi-Fei Sun, Bao-Can Dong, Qing Yuan, Bei Liu, Chang-Yu Sun, Guang-Jin Chen
Summary: A new numerical simulator was developed for hydrate exploitation by CO2/N-2-CH4 replacement. CO2/N-2 injection combined with depressurization was used for gas production in actual hydrate reservoirs. The study investigated the influence of feed gas composition and injection pressure on CO2 sequestration and CH4 production, and compared the advantages of CO2/N-2 injection over traditional methods.
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
Engineering, Environmental
Yu-Hsuan Ho, Yau Zu Khoo, Yan-Ping Chen, Ryo Ohmura, Li-Jen Chen
Summary: This study investigates the thermodynamic and kinetic influence of polyethylenimine (PEI) on the formation of methane and carbon dioxide hydrates. It is found that PEI acts as a thermodynamic inhibitor, inhibiting the formation of hydrates. However, it has different effects on methane and carbon dioxide hydrates kinetically, inhibiting methane hydrate formation and promoting carbon dioxide hydrate formation.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Yan Xie, Yu-Jie Zhu, Tao Zheng, Qing Yuan, Chang-Yu Sun, Lan-Ying Yang, Guang-Jin Chen
Summary: Utilizing multi-defective ice to construct porous CO2 hydrate can improve the efficiency of CH4-CO2 hydrate replacement, providing a new method for CH4 recovery and CO2 sequestration. Experimental results showed that the replacement efficiency at 272.15 K was significantly higher than at 268.15 K, confirming the feasibility of the replacement concept.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Thermodynamics
G. G. Tsypkin
Summary: The study investigates the mechanism of converting methane hydrate into carbon dioxide hydrate by injecting gaseous carbon dioxide into a reservoir, and develops a mathematical model describing the replacement reaction process. Various reaction regimes and critical parameters for the conversion of CH4 hydrate to CO2 hydrate are explored.
Article
Energy & Fuels
Stian Almenningen, Arne Graue, Geir Ersland
Summary: This paper reviews experimental studies of CH4-CO2 exchange in CH4 hydrate-bearing sandstone core plugs, highlighting the critical role of water saturation in these processes. The results presented are important for assessing natural gas hydrate reservoirs as candidates for CO2 injection with concurrent CH4 gas production.
Article
Water Resources
Yarlong Wang
Summary: This study developed a thermal-hydraulic-mechanical (THM) formulation incorporating conductive-convective heat transfer mechanism and analyzed temperature and pressure perturbations. Solutions for high-permeability and low-permeability formations were presented, simulating two separate processes, convective-conductive and conductive heat transfers. The Laplace transform technique was used and the inversely transformed solution was solved numerically. CO2/CH4 injection for sequestration and storage purposes were used as an example, and the impacts of phase and thermal-hydraulic (TH) characteristics changes on injectivity, capacity, post-production safety, and operating design were highlighted.
ADVANCES IN WATER RESOURCES
(2022)
Article
Engineering, Chemical
Alberto Maria Gambelli, Andrea Di Schino, Federico Rossi
Summary: Through experiments, it was found that Cu particles were able to promote methane hydrates and inhibit carbon dioxide hydrates in additive manufacturing, with the effect depending on the particle concentration and chemical properties. The results were validated by comparing them with the literature.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Chemistry, Physical
Phakamile Ndlovu, Saeideh Babaee, Paramespri Naidoo
Summary: Vast methane hydrates found in seabeds and permafrost areas can be used as an energy source and provide a storage solution for greenhouse gases by encapsulating carbon dioxide. The article presents experimental results on the replacement process using a laboratory reactor and various additives to enhance the reaction.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
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
Energy & Fuels
Yi-Fei Sun, Jin-Rong Zhong, Wen-Zhi Li, Yi-Ming Ma, Rui Li, Tao Zhu, Liang-Liang Ren, Guang-Jin Chen, Chang-Yu Sun
Article
Energy & Fuels
Yi-Fei Sun, Yun-Fei Wang, Jin-Rong Zhong, Wen-Zhi Li, Rui Li, Bo-Jian Cao, Jing-Yu Kan, Chang-Yu Sun, Guang-Jin Chen
Article
Energy & Fuels
Xiao-Hui Wang, Qiang Xu, Ya-Nan He, Yun-Fei Wang, Yi-Fei Sun, Chang-Yu Sun, Guang-Jin Chen
Article
Energy & Fuels
Jin-Rong Zhong, Yi-Fei Sun, Wen-Zhi Li, Yan Xie, Guang-Jin Chen, Chang-Yu Sun, Lan-Ying Yang, Hui-Bo Qin, Wei-Xin Pang, Qing-Ping Li
Article
Energy & Fuels
Liang-Liang Ren, Ya-Hui Qi, Jun-Li Chen, Yi-Fei Sun, Chang-Yu Sun, Xiao-Hui Wang, Guang-Jin Chen, Qing Yuan, Wei-Xin Pang, Qing-Ping Li
Article
Energy & Fuels
Yi-Fei Sun, Jin-Rong Zhong, Guang-Jin Chen, Bo-Jian Cao, Rui Li, Dao-Yi Chen
Summary: The study proposed a novel method of using pressure-retaining gas injection to recover natural gas from unsealed marine hydrate deposits, effectively inhibiting water invasion, improving gas recovery rate, and achieving a balance between CO2 sequestration and CH4 recovery to reduce costs.
Article
Thermodynamics
Jing-Yu Kan, Yi-Fei Sun, Bao-Can Dong, Qing Yuan, Bei Liu, Chang-Yu Sun, Guang-Jin Chen
Summary: A new numerical simulator was developed for hydrate exploitation by CO2/N-2-CH4 replacement. CO2/N-2 injection combined with depressurization was used for gas production in actual hydrate reservoirs. The study investigated the influence of feed gas composition and injection pressure on CO2 sequestration and CH4 production, and compared the advantages of CO2/N-2 injection over traditional methods.
Article
Engineering, Environmental
Mengya Niu, Guozhong Wu, Zhenyuan Yin, Yifei Sun, Kai Liu, Daoyi Chen
Summary: The study demonstrates that recovery of CH4 hydrate at marine conditions through CO2-N2 gas injection is technically feasible, but careful control of the composition of the mixed gas is required to ensure replacement efficiency.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Jin-Rong Zhong, Yi-Fei Sun, Yan Xie, Yu-Jie Zhu, Chang-Yu Sun, Guang-Jin Chen, Yue-Fei Zhang
Summary: The dissolution rates of CO2 hydrates in sediments were calculated under different diffusion stages, showing a rapid initial dissolution followed by a slowing rate due to decreasing concentration gradients. CO2 hydrates covered by sediments dissolved much slower than those in direct contact with water layers, indicating a strong dependency on velocity when exposed to flowing water layers.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Energy & Fuels
Yi-Fei Sun, Bo-Jian Cao, Jin-Rong Zhong, Jing-Yu Kan, Rui Li, Jing-Shuo Niu, Hong-Nan Chen, Guang-Jin Chen, Guo-Zhong Wu, Chang-Yu Sun, Dao-Yi Chen
Summary: This study effectively improves the efficiency of natural gas extraction, increases the CH4 recovery rate, and achieves CO2 hydrate storage through reservoir reformation technology. The results show that this method is very promising.
Article
Thermodynamics
Bao-Can Dong, Peng Xiao, Yi-Fei Sun, Jing-Yu Kan, Ming-Ke Yang, Xiao-Wan Peng, Chang-Yu Sun, Guang-Jin Chen
Summary: This study analyzed the evolution and geological stability of hydrate deposits in the South China Sea during depressurization using a numerical model. The analysis also determined the gas-water production. The findings provide important insights for the exploitation of marine heterogeneous hydrates.
Article
Thermodynamics
Rui Li, Bo-Jian Cao, Hong-Nan Chen, Xiao-Hui Wang, Yi-Fei Sun, Chang-Yu Sun, Bei Liu, Wei-Xin Pang, Qing-Ping Li, Guang-Jin Chen
Summary: Short production periods and high costs are obstacles for commercial exploitation of natural gas hydrates (NGHs). This study explores a method to prepare NGHs deposits with an underlying free gas layer and a hydrate layer on top, and conducts experiments to investigate its gas production characteristics. The results show that the temperature of the hydrate layer and the free gas layer exhibit different variations during gas production, and lower production pressure leads to higher gas production rate and recovery ratio. Setting the wellbore at the underlying free gas layer enhances hydrate decomposition and improves gas production efficiency.
Proceedings Paper
Energy & Fuels
Jinrong Zhong, Yifei Sun, Changyu Sun, Guangjin Chen
INNOVATIVE SOLUTIONS FOR ENERGY TRANSITIONS
(2019)
Proceedings Paper
Energy & Fuels
Yifei Sun, Jinrong Zhong, Guangjin Chen, Changyu Sun
INNOVATIVE SOLUTIONS FOR ENERGY TRANSITIONS
(2019)
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.