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
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
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
Jiang Bian, Hongchao Wang, Kairan Yang, Junwen Chen, Xuewen Cao
Summary: The submarine CO2 hydrate-based geological storage is an effective method for carbon capture and storage, which is significant for mitigating the greenhouse effect. The pressure and temperature variation can affect the storage stability of CO2 hydrate. Experimental studies show that the energy distribution in the hydrate mixed system is uneven during dissociation, and the heat flux flows to the region with high sensible heat consumption.
Article
Thermodynamics
Yanghui Li, Le Wang, Yao Xie, Peng Wu, Tao Liu, Lei Huang, Shuheng Zhang, Yongchen Song
Summary: Natural gas hydrate, as a promising new energy, has attracted wide attention in the past decades. Experimental efforts have been made to explore the mechanical characteristics of hydrate-bearing clayey sediment under stable conditions, but few studies focus on its creep characteristics during the dissociation process. This study presents triaxial creep test results of methane hydrate-bearing clayey sediment using the depressurization dissociation method, with methane hydrate-bearing sandy sediments added for comparison. The results show that depressurization has little effect on axial strain but increases volumetric strain and reduces equivalent Poisson's ratio.
Article
Energy & Fuels
Xingxun Li, Ming Liu, Qingping Li, Weixin Pang, Guangjin Chen, Changyu Sun
Summary: This study investigated the formation and depressurization-induced dissociation behaviors of methane hydrate in porous media using a high-pressure transparent micro-packed bed reactor. The results revealed the effect of methane bubble dispersion on hydrate formation, observed hydrate reformation during depressurization, and demonstrated the impact of fluid extraction rate on hydrate reformation. The dissociation process of hydrate and fluid migration phenomena in the pore spaces were also visualized.
Article
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
Energy & Fuels
Yue Xu, Jialu Zhang, Kunming Song, Xin Geng, Yuxing Li, Wuchang Wang
Summary: The decomposition process of the hydrate deposition layer in the gas-water system was studied using a high-pressure transparent rock-flow cell. It was found that the decomposition rate was faster when using the depressurization method compared to the heating method. An electrical signal-based method for monitoring the decomposition of the hydrate layer on the pipe wall was proposed. Different decomposition mechanisms were observed depending on the heating or depressurization method.
Article
Engineering, Chemical
Xuke Ruan, Xiao-Sen Li
Summary: This study investigated the surface area of methane hydrate during dissociation in porous media by comparing experimental results with numerical simulations. Two conceptual models were proposed based on the morphology of hydrate, which showed the importance of hydrate dissociation surface area for gas production. The results indicated the significant impact of hydrate dissociation surface area on cumulative gas production, with different models performing better at different hydrate saturations.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Thermodynamics
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
Chemistry, Multidisciplinary
Mingyu Xue, Yuanfang Cheng, Yang Li, Chuanliang Yan, Zhongying Han, Yong Chen, Bo Sun
Summary: This study developed a fully coupled thermo-hydro-mechanical-chemical (THMC) model based on the geological features of reservoirs in the Shenhu area of the South China Sea to analyze the response characteristics of various physical fields during hydrate exploitation. The study found that neglecting solid mechanics can result in overestimated hydrate productivity, and that hydrate saturation and seawater depth have significant effects on production efficiency and reservoir deformation.
Article
Thermodynamics
Juan He, Xiaosen Li, Zhaoyang Chen, Xiaoliang Huang, Pengfei Shen
Summary: This study investigates the effect of heterogeneous hydrate distribution on hydrate production. The results show that the heterogeneity degree of hydrate distribution influences water and gas production, as well as the temperature loss and sensible heat use ratio. The impact is most significant when the hole combination is 1-2 holes.
Article
Engineering, Chemical
Xiang Sun, Hao Luo, Kenichi Soga
Summary: This study proposes a simple coupled compressibility-permeability analysis method to identify the conditions under which the effective permeability increases or decreases after depressurization. It is found that during hydrate dissociation, hydrate dissociation dominates the effective permeability, but after dissociation, soil compaction is the governing factor for permeability change.
Article
Thermodynamics
Jin-Long Cui, Li-Wei Cheng, Jing-Yu Kan, Wei-Xin Pang, Jun-Nan Gu, Kun Li, Ling-Ban Wang, Chang-Yu Sun, Xiao-Hui Wang, Guang-Jin Chen, Xing-Xun Li
Summary: The spatial difference in hydrate dissociation by depressurization was found to be influenced by water saturation and distance from the mining well. The vertical spatial difference was more pronounced than the horizontal one.
Article
Thermodynamics
Shuang Dong, Mingjun Yang, Lei Zhang, Jia-nan Zheng, Yongchen Song
Summary: This study investigates the thermodynamic evolution of methane hydrate-bearing deposits during long depressurization. Five experiments with different methane yields were conducted to simulate the process. The results show that the rates of depressurization and hydrate dissociation increase linearly with increasing methane yield. Icing occurs when the pressure reaches a certain level and accelerates the dissociation of hydrates. Different exploitation stages exhibit different thermodynamic responses due to the combination of various non-equilibrium processes. The findings provide insights into the complex coupling mechanism of phase change and heat and mass transfer in methane hydrate exploitation.
Article
Engineering, Petroleum
S. S. Zhou, M. Li, P. Wu, Y. Liu, L. X. Zhang, L. Yang, Y. H. Li, J. F. Zhao, Y. C. Song
Summary: In this study, X-ray microcomputed tomography (CT) and the pore network model (PNM) were used to investigate the permeability characteristics of gas and water in hydrate-bearing porous media. The results showed that the permeability of hydrate-bearing porous media was influenced by the movement of disordered sand particles, as well as changes in pore structure factors. Additionally, the preferential flow direction and connate water saturation were found to change during the shear process.
Article
Engineering, Environmental
Yang Zhao, Yanzhen Liu, Hongsheng Dong, Chong Chen, Tianxiang Zhang, Lei Yang, Lunxiang Zhang, Yu Liu, Yongchen Song, Jiafei Zhao
Summary: This paper proposes a new method for coating inhibitors, which allows for the magnetic recovery of inhibitory particles and demonstrates good cycle performance. The experimental results show that this method can effectively extend the formation time of hydrates and solve pipeline blockage issues by preventing further growth of hydrates.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Chemical
Rui Du, Yixuan Fu, Lunxiang Zhang, Jiafei Zhao, Yongchen Song, Zheng Ling
Summary: Significant advances have been made in seawater desalination, but the discharge of hypersaline concentrate presents challenges for treatment. This study demonstrates the potential of hydrate-based desalination in treating brine with high concentrations of salt. Carbon materials play a crucial role in inducing hydrate nucleation and the crystallinity and surface compositions of these materials impact desalination efficiency. These findings will help in developing effective hydrate promoters for treating hypersaline brine.
Article
Chemistry, Multidisciplinary
Chengxin Deng, Hongsheng Dong, Keyan Sun, Yan Kou, Hanqing Liu, Weiwei Jian, Quan Shi
Summary: This article introduces a flexible self-healing phase change film with unique functions that can achieve synchronous visual/infrared stealth in multiple scenes. The phase change film has adjustable transition temperature and enthalpy, long-term cycling stability, and excellent flexibility and self-healing performance. It can also be customized with different colors and various configurations to exhibit attractive visual stealth functions in different scenarios. Additionally, due to its phase transition property, the phase change film has thermal management capability and can behave infrared stealth performance for objects at different temperatures.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Energy & Fuels
Lei Yang, Dawei Guan, Aoxing Qu, Qingping Li, Yang Ge, Huiyong Liang, Hongsheng Dong, Shudong Leng, Yanzhen Liu, Lunxiang Zhang, Jiafei Zhao, Yongchen Song
Summary: The unique behavior of gas hydrate formation, characterized by anisotropic growth and thermotactic behavior, was identified. By regulating temperature and heat transfer scheme, one can control the morphology and behavior of hydrate formation, which is important for the application of hydrate-based techniques.
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
Engineering, Chemical
Lingjie Sun, Huilian Sun, Tian Wang, Hongsheng Dong, Lunxiang Zhang, Lei Yang, Jiafei Zhao, Yongchen Song
Summary: This study observed the formation behavior of hydrates in quartz glass beads using a nuclear magnetic resonance system, and found that not all molecules capable of forming hydrates exhibited water absorption effects. The interfacial tension between hydrates and bound water was the driving force for water migration, and larger particle sand facilitated water migration while low initial water saturation inhibited it.
Article
Mechanics
Pengfei Lv, Yu Liu, Feng Liu, Wenzhe Yang, Yahui Wang, Hantao Liu, Yongchen Song
Summary: The geometric structure variation of the nonwetting phase (NWP) in porous media plays a critical role in energy-related processes. This study used high resolution x-ray microcomputed tomography (micro-CT) to investigate the morphological and topological characteristics of NWP during gas/liquid displacements in three different rock cores. It was found that roof and distal snap-off occurred during drainage, resulting in nonwetting singlets and ganglia. Throat snap-off and pore snap-off were observed during imbibition, occurring at a single-pore scale. The trapped NWP during primary drainage can be displaced in main imbibition through snap-off events or viscous remobilization.
Article
Chemistry, Multidisciplinary
Chongwei Wang, Hongsheng Dong, Chuanxiao Cheng, Keyan Sun, Tingxiang Jin, Quan Shi
Summary: In this study, a flexible and biocompatible composite phase change material (PCM) for wearable personal thermal management was prepared using renewable natural silkworm cocoons and biocompatible capric acid. The results showed that the composite PCM exhibited excellent performance and stability under different environmental conditions.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Thermodynamics
Kunpeng Xue, Yu Liu, Tao Yu, Lei Yang, Jiafei Zhao, Yongchen Song
Summary: An accurate description of reservoir characteristics is crucial for the precise prediction of gas production from natural gas hydrate deposits. Previous studies assumed homogeneous permeability in large-scale NGH production cases, but this work established a multi-layered heterogeneous-permeability reservoir model and analyzed gas production behavior using the TOUGH + HY-DRATE simulator. It was found that scatter distribution of hydrate and free gas occurs in this reservoir model, and reservoirs with heterogeneous permeability perform better than homogeneous ones.
Article
Green & Sustainable Science & Technology
Pengfei Lv, Lanlan Liu, Guangping Lei, Hongsheng Dong
Summary: This paper investigates the pore-scale thermal performance and the influence of packing methods and microcapsule sizes on thermal storage of PCM microcapsule packed-bed systems. Various spherical PCM microcapsule pack models are introduced and the thermal storage properties are studied using the finite element method. The results show that multi-layered packed-bed systems have better thermal storage performance than single-layered packed-bed systems. Reducing the capsule size and using cross-packing methods can improve the charging process and shorten the charging time.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Energy & Fuels
Yu Liu, Jiateng Duan, Dianqiang Xu, Jiawei Chu, Shi Shen, Jiafei Zhao, Lanlan Jiang
Summary: The phase equilibria of different systems were investigated, and it was found that mineral oil and MEG shifted the phase equilibrium to different directions. The hydrate inhibition performance and generation characteristics of the composite formulation of Luvicap 55w and MEG were studied, and it was observed that increasing subcooling decreased the induction time and increased gas consumption. The induction time increased with increasing MEG concentration, confirming the synergistic effect of MEG in the oil-water emulsion for Luvicap 55w.
ENERGY SCIENCE & ENGINEERING
(2023)
Article
Engineering, Chemical
Kunpeng Xue, Yu Liu, Tao Yu, Junchen Lv
Summary: This study aims to assess the effectiveness of the step-wise depressurization method for gas production from natural gas hydrates in the Nankai Trough. The simulation results showed that the step-wise depressurization method significantly increased the cumulative gas production by more than 10% and mitigated the rapid generation of gas and water production during the moment of depressurization. It is suggested that a depressurization gradient of 1 MPa and a maintenance time of 1 day should be employed.
Article
Energy & Fuels
Chengxin Deng, Hongsheng Dong, Yan Kou, Hanqing Liu, Keyan Sun, Weiwei Jian, Quan Shi
Summary: A flexible self-healing phase change film with high transition enthalpy has been developed by incorporating erythritol into hydrogen-bonded networks. The film exhibits excellent flexibility with a high phase transition enthalpy of 191.5 J/g at 98.7 degrees C. Furthermore, the film demonstrates a remarkable self-healing ability with a healing efficiency of 91.1%.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Thermodynamics
Fan Wang, Xinran Xia, Yuan Lv, Chuanxiao Cheng, Lei Yang, Lunxiang Zhang, Jiafei Zhao
Summary: This paper investigates the heat transfer, energy conversion, and efficiency of a novel TBAB hydrate cold storage system during cold discharge. The results indicate that forced convection caused by gas disturbance enhances the cold discharge capacity and reduces the discharge time. Additionally, the cold discharge capacity increases with decreasing cold charge temperature and increasing flow rate. The cold discharge efficiency is over 83% under different conditions.
APPLIED THERMAL ENGINEERING
(2022)
Article
Engineering, Chemical
Qing Han, Mengqing Shi, Linkai Han, Di Liu, Mingwei Tong, Yuxin Xie, Zhonghua Xiang
Summary: Developing highly efficient bifunctional oxygen electrocatalysts is crucial for zinc-air flow batteries. Metal-organic frameworks (MOFs) and covalent organic polymers (COPs) have emerged as promising alternatives due to their designable and controllable atomic-level structures. However, their catalytic performances are limited by conductivity and catalytic activity. In this study, nanosheet FeNi-MOF and iron phthalocyanine rich COP hybrid materials are assembled through the pi-pi stacking effect to create highly efficient bifunctional electrocatalysts. The resulting catalyst exhibits superior catalytic performance and stability, making it a promising candidate for zinc-air flow batteries.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Daria Grigorash, Dmytro Mihrin, Rene Wugt Larsen, Erling H. Stenby, Wei Yan
Summary: The article introduces a new approach to describe the cross-association between molecules, allowing for the simulation of weakly bound molecular complexes with different conformations in mixtures. By incorporating this approach into the equation of state, accurate predictions of vapor-liquid equilibrium and liquid-liquid equilibrium can be made. The new method is validated through experiments on alcohol and acid mixtures, with the results compared to experimental data, demonstrating its accuracy and reliability.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Mohammed Al-Sharabi, Daniel Markl, Vincenzino Vivacqua, Prince Bawuah, Natalie Maclean, Andrew P. E. York, Axel Zeitler
Summary: This study used terahertz pulsed imaging to investigate the transport process of different solvents into ceramic catalytic materials. The results showed that the heating rate of the samples influenced the water transport rate, while the viscosity of 1-octanol slowed down its transport.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Chukwunonso Anyaoku, Sati Bhattacharya, Rajarathinam Parthasarathy
Summary: This study aimed to enhance understanding of settling dynamics in viscoelastic fluids by developing a semi-empirical correlation and a dimensionless ratio, which accurately described the characteristics of settling suspensions.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Antti I. Koponen, Janika Viitala, Atsushi Tanaka, Baranivignesh Prakash, Olli-Ville Laukkanen, Ari Jasberg
Summary: This study focuses on the development of foam application chemicals for the paper and board industry. The research explores the rheology of the polyvinyl alcohol foam used in the process. Measurements were conducted to determine the foam viscosity and slip flow. The results suggest that slip flow contributes significantly to the total flow rate, and the obtained viscosity and slip models provide a solid foundation for industrial processes.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Dalei Sun, Jinghui Cai, Yating Yang, Zhiwu Liang
Summary: In this study, Fe-doped alpha-Bi2O3 catalysts with different Fe/Bi molar ratios were synthesized and utilized in the carbonylation of isobutyl amine with CO2. The results showed that Fe doping significantly enhanced the catalytic abilities of alpha-Bi2O3.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Yuan Tian, Xinxin Wang, Yanrong Liu, Wenping Hu
Summary: This paper predicts the solubility of nitrogen gas in ionic liquids (ILs) using two quantitative structure-property relationship (QSPR) models. By combining machine learning methods and ionic fragments contribution method, the accuracy and reliability of the prediction models are improved.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Liwang Wang, Wei Liu, Pan Yang, Yulong Chang, Xiaoxu Duan, Lingyu Xiao, Yaoming Hu, Jiwei Wu, Liang Ma, Hualin Wang
Summary: This study investigates the effective phase interfacial area (ae) of hydro-jet cyclones at different injection angles. The results show that a 45 degrees upward incidence angle yields the most favorable flow field characteristics for efficient mass transfer. The significant enhancement in ae of the hydro-jet cyclones offers the advantage of reducing equipment volume and cost savings.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Chuanjun Wu, Jiangzhi Chen, Jiyue Sun, I-Ming Chou, Shenghua Mei, Juezhi Lin, Lei Jiang
Summary: In this study, the solubility of H2S hydrate in water was measured using Raman spectroscopy. The results showed that the solubility increases with temperature under certain equilibrium conditions, and the solubility also depends on pressure and temperature under different equilibrium conditions. A thermodynamic model based on the van der Waals-Platteeuw theory was developed to predict the solubility, demonstrating its accuracy.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Lorenzo Brivio, Serena Meini, Mattia Sponchioni, Davide Moscatelli
Summary: This study investigates the influence of three main parameters and proposes a kinetic model to predict the optimal operating conditions for high yield of dimethyl terephthalate (DMT) in the chemical recycling process of polyethylene terephthalate (PET).
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Hongju Lin, Fanhui Liao, Yanchang Chu, Mingyu Xie, Lun Pan, Yuanyuan Wang, Lijian Leng, Donghai Xu, Le Yang, Gangfeng Ouyang
Summary: A honeycomb NiCo/C-Na catalyst with a micro-meso-macroporous structure has been fabricated and shown to have significantly higher catalytic activity for the decarboxylation of fatty acids. It also proves to be efficient in upgrading sludge HTL bio-crude, resulting in a biofuel with decreased viscosity and increased density.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Xiaoxian Li, Rui Li, Min Lin, Mingde Yang, Yulong Wu
Summary: A series of coated non-noble metal porous carbon catalysts were synthesized and applied to the aqueous-phase deoxygenation of algal bio-oil. One of the catalysts showed excellent deoxygenation selectivity and catalytic activity at 250 degrees C. The catalyst exhibited good hydrothermal stability and the reaction mechanism was proposed based on product analysis and active site analysis.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
M. V. Chudakova, M. V. Popov, P. A. Korovchenko, E. O. Pentsak, A. R. Latypova, P. B. Kurmashov, A. A. Pimenov, E. A. Tsilimbaeva, I. S. Levin, A. G. Bannov, A. V. Kleymenov
Summary: A series of catalysts with different potassium contents were prepared using solution combustion synthesis and characterized using various techniques. The results showed that the potassium content affected the phase composition and texture of the catalysts. The addition of a small amount of potassium resulted in a change in particle size distribution, leading to higher hydrogen yield. The Ni-1%K2O/Al2O3 catalyst exhibited the highest hydrogen yield at temperatures of 675 and 750 degrees Celsius.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Aliakbar Roosta, Nima Rezaei
Summary: In this study, we modified the electrolyte cubic plus association equation of state (e-CPA EoS) and integrated it with two electrical conductivity models to estimate the electrical conductivity of 11 monovalent electrolyte solutions in water. The modified e-CPA model demonstrated better performance and the hybridization with electrical conductivity models resulted in two predictive models for estimating the electrical conduction of dilute and concentrated electrolyte solutions. These predictive models showed relative average percentage deviations (AARD) of 11.15% and 13.87% over wide ranges of temperature and electrolyte concentration.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Haoren Niu, Jianzheng Wang, Qingzhu Jia, Qiang Wang, Jin Zhao, Fangyou Yan
Summary: A study developed two quantitative structure-property relationship models for the complexation performance of alpha- and beta-cyclodextrins and validated their stability and predictive ability through internal and external validation. The models showed robustness and satisfactory performance, as demonstrated by the experimental results and model validations. These models can effectively predict the binding constants between cyclodextrins and various types of molecules, providing valuable tools for cyclodextrin design.
CHEMICAL ENGINEERING SCIENCE
(2024)
