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
Chemistry, Multidisciplinary
Geng Zhang, Jun Li, Gonghui Liu, Hongwei Yang, Honglin Huang
Summary: The established hydrate dynamic decomposition model in the research can simulate the decomposition process of hydrate particles in flowing water effectively, showing that decomposition is a non-isothermal process influenced by heat transfer rate in the early stage and intrinsic kinetics in the late stage. Activation energy and water flow rate have significant impacts on the hydrate decomposition rate.
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
O. S. Gaidukova, V. V. Dorokhov, S. Y. Misyura, V. S. Morozov, N. E. Shlegel, P. A. Strizhak
Summary: The dissociation and combustion of methane hydrate samples were experimentally studied under different thermal conditions. The synergistic effects of simultaneously dissociating methane and carbon dioxide hydrates were analyzed. It was found that ignition of methane hydrate granules was faster than tablets, and increasing the combustion chamber temperature improved the ignition performance of tablets.
Article
Energy & Fuels
Sergey Y. Misyura, Igor G. Donskoy
Summary: The process of burning methane hydrate is influenced by the interaction of dissociation and combustion, with layer temperature and porosity changes significantly affecting thermal conductivity and dissociation rate. Experimental results may help improve combustion efficiency, suitable for energy sector applications.
Article
Energy & Fuels
Huiru Sun, Bingbing Chen, Ziming Yang, Yongchen Song, Mingjun Yang
Summary: This study focused on the effects of hydrate saturation change and multiphase flow on NGHs production behaviors at different exploitation stages. The results showed that initial hydrate saturation and water-gas flowrate were negatively correlated with the onset time of blockage and amount of hydrate reformation.
Article
Chemistry, Physical
Satoshi Takeya, Akihiro Hachikubo, Hirotoshi Sakagami, Hirotsugu Minami, Satoshi Yamashita, Masayoshi Takahashi, Keiichi Hirano, Kazuyuki Hyodo, Akio Yoneyama
Summary: Understanding the dissolution processes of natural methane (CH4) hydrates is crucial for assessing the amount of methane released into seawater from unconventional natural gas resources. High-resolution experiments have successfully visualized the spatial relationships between methane hydrates and seawater, revealing that dissociation of methane hydrates leads to the formation of microbubbles.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
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
Energy & Fuels
M. Fahed Qureshi, Vikas Dhamu, Adam Usadi, Timothy A. Barckholtz, Ashish B. Mhadeshwar, Praveen Linga
Summary: Carbon capture and sequestration is a critical method to reduce carbon footprint and achieve net-zero carbon emissions. This study examines the kinetics of CO2 hydrate formation using liquid CO2 and a green kinetic promoter, and presents a mathematical model for quantifying hydrate formation kinetics. The results show that the green kinetic promoter enhances the overall water to hydrate conversion and reduces the formation process time.
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
Energy & Fuels
Junjie Ren, Zhenyuan Yin, Qingping Li, Fei Wu, Daoyi Chen, Shuxia Li
Summary: This study investigates the pore-scale behavior of methane hydrate (MH) formation and dissociation in clayey-silty sediments and the associated fluid migration using low-field nuclear magnetic resonance (NMR) technique. The results show that MH forms first in small pores and then in large pores. The presence of clay slows down the growth kinetics of MH. During depressurization, MH dissociates first in large pores in sand and free water migrates to small pores associated with clay.
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
Engineering, Environmental
Yuechao Zhao, Xu Lei, Jia-nan Zheng, Ming Li, Michael L. Johns, Mingxing Huang, Yongchen Song
Summary: Gas hydrates are considered promising for gas storage, energy transportation, and seawater desalination. Using MRI, researchers were able to non-invasively image the formation of opaque hydrates from CO2 and water in a cylindrical vessel at low temperature and high pressure. They observed dense hydrate layers forming consistently at the gas-water interface, porous hydrate layers above it, and complex dendritic formations in the water phase below.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Thermodynamics
Bingbing Chen, Huiru Sun, Kehan Li, Tao Yu, Lanlan Jiang, Mingjun Yang, Yongchen Song
Summary: This study investigated the effect of unsaturated water flow on the permeability variation and gas production behavior in hydrate-bearing and hydrate-free sediment. The results showed that hydrate dissolution increased permeability and formed obvious unsaturated water flow channels. Higher water flow velocity accelerated hydrate dissolution and led to a faster increase in permeability and gas production. The findings suggest new insights for the efficient production of NGHs.
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
Yingna Du, Chen Huang, Wei Jiang, Qiangwei Yan, Yongfei Li, Gang Chen
Summary: In this study, anionic surfactants modified hydrotalcite was used as a flow improver for crude oil under low-temperature conditions. The modified hydrotalcite showed a significant viscosity reduction effect on crude oil. The mechanism of the modified hydrotalcite on viscosity and pour point of crude oil was explored through characterization and analysis of the modified hydrotalcite and oil samples.
Article
Energy & Fuels
Mohammad Saeid Rostami, Mohammad Mehdi Khodaei
Summary: In this study, a hybrid structure, MIL-53(Al)@MWCNT, was synthesized by combining MIL-53(Al) particles and -COOH functionalized multi-walled carbon nanotube (MWCNT). The hybrid structure was then embedded in a polyethersulfone (PES) polymer matrix to prepare a mixed matrix membrane (MMM) for CO2/CH4 and CO2/N2 separation. The addition of MWCNTs prevented MIL-53(Al) aggregation, improved membrane mechanical properties, and enhanced gas separation efficiency.
Article
Energy & Fuels
Yunlong Li, Desheng Huang, Xiaomeng Dong, Daoyong Yang
Summary: This study develops theoretical and experimental techniques to determine the phase behavior and physical properties of DME/flue gas/water/heavy oil systems. Eight constant composition expansion (CCE) tests are conducted to obtain new experimental data. A thermodynamic model is used to accurately predict saturation pressure and swelling factors, as well as the phase boundaries of N2/heavy oil systems and DME/CO2/heavy oil systems, with high accuracy.
Article
Energy & Fuels
Morteza Afkhamipour, Ebad Seifi, Arash Esmaeili, Mohammad Shamsi, Tohid N. Borhani
Summary: Non-conventional amines are being researched worldwide to overcome the limitations of traditional amines like MEA and MDEA. Adequate process and thermodynamic models are crucial for understanding the applicability and performance of these amines in CO2 absorption, but studies on process modeling for these amines are limited. This study used rate-based modeling and Deshmukh-Mather method to model CO2 absorption by DETA solution in a packed column, validated the model with experimental data, and conducted a sensitivity analysis of mass transfer correlations. The study also compared the CO2 absorption efficiency of DETA solution with an ionic solvent [bmim]-[PF6] and highlighted the importance of finding optimum operational parameters for maximum absorption efficiency.
Article
Energy & Fuels
Arastoo Abdi, Mohamad Awarke, M. Reza Malayeri, Masoud Riazi
Summary: The utilization of smart water in EOR operations has gained attention, but more research is needed to understand the complex mechanisms involved. This study investigated the interfacial tension between smart water and crude oil, considering factors such as salt, pH, asphaltene type, and aged smart water. The results revealed that the hydration of ions in smart water plays a key role in its efficacy, with acidic and basic asphaltene acting as intrinsic surfactants. The pH also influenced the interfacial tension, and the aged smart water's interaction with crude oil depended on asphaltene type, salt, and salinity.
Article
Energy & Fuels
Dongao Zhu, Kun Zhu, Lixian Xu, Haiyan Huang, Jing He, Wenshuai Zhu, Huaming Li, Wei Jiang
Summary: In this study, cobalt-based metal-organic frameworks (Co-based MOFs) were used as supports and co-catalysts to confine the NHPI catalyst, solving the leaching issue. The NHPI@Co-MOF with carboxyl groups exhibited stronger acidity and facilitated the generation of active oxygen radicals O2•, resulting in enhanced catalytic activity. This research provides valuable insights into the selection of suitable organic linkers and broadens the research horizon of MOF hybrids in efficient oxidative desulfurization (ODS) applications.
Article
Energy & Fuels
Edwin G. Hoyos, Gloria Amo-Duodu, U. Gulsum Kiral, Laura Vargas-Estrada, Raquel Lebrero, Rail Munoz
Summary: This study investigated the impact of carbon-coated zero-valent nanoparticle concentration on photosynthetic biogas upgrading. The addition of nanoparticles significantly increased microalgae productivity and enhanced nitrogen and phosphorus assimilation. The presence of nanoparticles also improved the quality of biomethane produced.
Article
Energy & Fuels
Yao Xiao, Asma Leghari, Linfeng Liu, Fangchao Yu, Ming Gao, Lu Ding, Yu Yang, Xueli Chen, Xiaoyu Yan, Fuchen Wang
Summary: Iron is added as a flocculant in wastewater treatment and the hydrothermal carbonization (HTC) of sludge produces wastewater containing Fe. This study investigates the effect of aqueous phase (AP) recycling on hydrochar properties, iron evolution and environmental assessment during HTC of sludge. The results show that AP recycling process improves the dewatering performance of hydrochar and facilitates the recovery of Fe from the liquid phase.
Article
Energy & Fuels
He Liang, Tao Wang, Zhenmin Luo, Jianliang Yu, Weizhai Yi, Fangming Cheng, Jingyu Zhao, Xingqing Yan, Jun Deng, Jihao Shi
Summary: This study investigated the influence of inhibitors (carbon dioxide, nitrogen, and heptafluoropropane) on the lower flammability limit of hydrogen and determined the critical inhibitory concentration needed for complete suppression. The impact of inhibitors on explosive characteristics was evaluated, and the inhibitory mechanism was analyzed with chemical kinetics. The results showed that with the increase of inhibitor quantity, the lower flammability limit of hydrogen also increased. The research findings can contribute to the safe utilization of hydrogen energy.
Article
Energy & Fuels
Zonghui Liu, Zhongze Zhang, Yali Zhou, Ziling Wang, Mingyang Du, Zhe Wen, Bing Yan, Qingxiang Ma, Na Liu, Bing Xue
Summary: In this study, high-performance solid catalysts based on phosphotungstic acid (HPW) supported on Zr-SBA-15 were synthesized and evaluated for the one-pot conversion of furfural (FUR) to γ-valerolactone (GVL). The catalysts were characterized using various techniques, and the ratio of HPW and Zr was found to significantly affect the selectivity of GVL. The HPW/Zr-SBA-15 (2-4-15) catalyst exhibited the highest GVL yield (83%) under optimized reaction conditions, and it was determined that a balance between Bronsted acid sites (BAS) and Lewis acid sites (LAS) was crucial for achieving higher catalytic performance. The reaction parameters and catalyst stability were also investigated.
Article
Energy & Fuels
Michael Stoehr, Stephan Ruoff, Bastian Rauch, Wolfgang Meier, Patrick Le Clercq
Summary: As part of the global energy transition, an experimental study was conducted to understand the effects of different fuel properties on droplet vaporization for various conventional and alternative fuels. The study utilized a flow channel to measure the evolution of droplet diameters over time and distance. The results revealed the temperature-dependent effects of physical properties, such as boiling point, liquid density, and enthalpy of vaporization, and showed the complex interactions of preferential vaporization and temperature-dependent influences of physical properties for multi-component fuels.
Article
Energy & Fuels
Yuan Zhuang, Ruikang Wu, Xinyan Wang, Rui Zhai, Changyong Gao
Summary: Through experimental validation and optimization of the chemical kinetic model, it was found that methanol can accelerate the oxidation reaction of ammonia, and methanol can be rapidly oxidized at high concentration. HO2 was found to generate a significant amount of OH radicals, facilitating the oxidation of methanol and ammonia. Rating: 7.5/10.
Article
Energy & Fuels
Radwan M. EL-Zohairy, Ahmed S. Attia, A. S. Huzayyin, Ahmed I. EL-Seesy
Summary: This paper presents a lab-scale experimental study on the impact of diethyl ether (DEE) as an additive to waste cooking oil biodiesel with Jet A-1 on combustion and emission features of a swirl-stabilized premixed flame. The addition of DEE to biodiesel significantly affects the flame temperature distribution and emissions. The W20D20 blend of DEE, biodiesel, and Jet A-1 shows similar flame temperature distribution to Jet A-1 and significantly reduces UHC, CO, and NOx emissions compared to Jet A-1.
Article
Energy & Fuels
Jiang Bian, Ziyuan Zhao, Yang Liu, Ran Cheng, Xuerui Zang, Xuewen Cao
Summary: This study presents a novel method for ammonia separation using supersonic flow and develops a mathematical model to investigate the condensation phenomenon. The results demonstrate that the L-P nucleation model accurately characterizes the nucleation process of ammonia at low temperatures. Numerical simulations also show that increasing pressure and concentration can enhance ammonia condensation efficiency.
Article
Energy & Fuels
Shiyuan Pan, Xiaodan Shi, Beibei Dong, Jan Skvaril, Haoran Zhang, Yongtu Liang, Hailong Li
Summary: Integrating CO2 capture with biomass-fired combined heat and power (bio-CHP) plants is a promising method for achieving negative emissions. This study develops a reliable data-driven model based on the Transformer architecture to predict the flowrate and CO2 concentration of flue gas in real time. The model validation shows high prediction accuracy, and the potential impact of meteorological parameters on model accuracy is assessed. The results demonstrate that the Transformer model outperforms other models and using near-infrared spectral data as input features improves the prediction accuracy.