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Analysis of physical properties of gas hydrate-bearing unconsolidated sediment samples from the ultra-deepwater

Frontiers in Energy 2022, Volume 16, Issue 3,   Pages 509-520 doi: 10.1007/s11708-021-0786-4

Abstract: Marine natural gas hydrate has recently attracted global attention as a potential new clean energy sourceLaboratory measurements of various physical properties of gas hydrate-bearing marine sediments can provideThis study presents comprehensive measurement results and analysis of drilled hydrate-bearing sedimentsThe results show that the gas hydrate in the core samples is mainly methane hydrate with a methane contentwhich indicate that high water saturation means that timely drainage should be paid attention to during hydrate

Keywords： natural gas hydrates     physical properties analysis     hydrate-bearing sediments    

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Fundamental characteristics of gas hydrate-bearing sediments in the Shenhu area, South China Sea

Xin LYU, Qingping LI, Yang GE, Junlong ZHU, Shouwei ZHOU, Qiang FU

Frontiers in Energy 2021, Volume 15, Issue 2,   Pages 367-373 doi: 10.1007/s11708-020-0714-z

Abstract: The basic physical properties of marine natural gas hydrate deposits are important to the understandingA comprehensive analysis of the core samples of drilling pressure-holding hydrate deposits at a depthThe experimental results indicate that the particle size in the hydrate sediment samples are mainly distributedThere are a large number of bioplastics in the sediment, and the crack inside the core may be areas of hydrate

Keywords： natural gas hydrate     Shenhu area     reservoirs characteristics    

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Research progress on hydrate plugging in multiphase mixed rich-liquid transportation pipelines

Shuyu SONG, Zhiming LIU, Li ZHOU, Liyan SHANG, Yaxin WANG

Frontiers in Energy 2022, Volume 16, Issue 5,   Pages 774-792 doi: 10.1007/s11708-020-0688-x

Abstract: system, and a water-based system according to the different water cuts, and discussed the mechanism of hydrateFurthermore, it proposed some suggestions for future research on hydrate plugging.the oil-based system, the effect factors of hydrates are combined with the mechanical properties of hydratedeposit layer, and the hydrate plugging mechanism models at inclined and elbow pipes should be establishedFinally, the effects of anti-agglomerates on the morphological evolution of hydrate under different systems

Keywords： hydrate     rich-liquid phase     plugging mechanism     coalescence     deposition     anti-agglomerate    

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Adsorption and partition of benzo(a)pyrene on sediments with different particle sizes from the Yellow

XIA Xinghui, HU Lijuan, MENG Lihong

Frontiers of Environmental Science & Engineering 2007, Volume 1, Issue 2,   Pages 172-178 doi: 10.1007/s11783-007-0030-4

Abstract: Experiments have been carried out to study the sorption of Benzo(a)pyrene(Bap) on sediment particles from the Yellow River using a batch equilibration technique. Effects of particle size on the adsorption and partition of Bap were investigated with the particle content of 3 g/L. Several significant results were obtained from the study. (1) Isotherms of Bap could be fitted with the dual adsorption-partition model under different particle sizes, and the measured value of the adsorption and partition was in agreement with the theoretical value of the dual adsorption-partition model. (2) When the particle diameter was "e 0.025 mm, the adsorption was predominant in the sorption of Bap, which accounted for 68.7% 82.4% of the sorption. For the particles with the size of 0.007 mm "e < 0.025 mm, the adsorption was predominant when the equilibrium concentration of Bap was 0 8.87 μg/L in the water phase; and the partition was predominant when the equilibrium concentration of Bap was higher than 8.87 μg/L in the water phase. When the particle diameter was <0.007 mm, the partition was predominant. (3) On the point of particle size, the contribution of adsorption to sorption followed the order: "e0.025 mm > 0.007 mm "d<0.025 mm > <0.007 mm . (4) The partition coefficients of Bap in solids with different particle sizes were linearly correlated with the organic content, and the K of Bap was about 1.26 x 10 (L/kg).
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Prediction of bed load sediments using different artificial neural network models

Reza ASHEGHI, Seyed Abbas HOSSEINI

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 2,   Pages 374-386 doi: 10.1007/s11709-019-0600-0

Abstract: Modeling and prediction of bed loads is an important but difficult issue in river engineering. The introduced empirical equations due to restricted applicability even in similar conditions provide different accuracies with each other and measured data. In this paper, three different artificial neural networks (ANNs) including multilayer percepterons, radial based function (RBF), and generalized feed forward neural network using five dominant parameters of bed load transport formulas for the Main Fork Red River in Idaho-USA were developed. The optimum models were found through 102 data sets of flow discharge, flow velocity, water surface slopes, flow depth, and mean grain size. The deficiency of empirical equations for this river by conducted comparison between measured and predicted values was approved where the ANN models presented more consistence and closer estimation to observed data. The coefficient of determination between measured and predicted values for empirical equations varied from 0.10 to 0.21 against the 0.93 to 0.98 in ANN models. The accuracy performance of all models was evaluated and interpreted using different statistical error criteria, analytical graphs and confusion matrixes. Although the ANN models predicted compatible outputs but the RBF with 79% correct classification rate corresponding to 0.191 network error was outperform than others.

Keywords： bed load prediction     artificial neural network     modeling     empirical equations    

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Progress in use of surfactant in nearly static conditions in natural gas hydrate formation

Zhen PAN, Yi WU, Liyan SHANG, Li ZHOU, Zhien ZHANG

Frontiers in Energy 2020, Volume 14, Issue 3,   Pages 463-481 doi: 10.1007/s11708-020-0675-2

Abstract: Natural gas hydrate is an alternative energy source with a great potential for development.The addition of surfactants has been found to have practical implications on the acceleration of hydrateIn this paper, the mechanisms of different surfactants that have been reported to promote hydrate formationBesides, the factors influencing surfactant-promoted hydrate formation, including the type, concentrationMoreover, the effects of surfactants on the formation of hydrate in pure water, brine, porous media,

Keywords： gas hydrate     kinetic hydrate promoter     compounding     model     surfactant     mechanism    

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Sorption of tetracycline to sediments and soils: assessing the roles of pH, the presence of cadmium andproperties of sediments and soils

Guixiang ZHANG, Xitao LIU, Ke SUN, Ye ZHAO, Chunye LIN

Frontiers of Environmental Science & Engineering 2010, Volume 4, Issue 4,   Pages 421-429 doi: 10.1007/s11783-010-0265-3

Abstract: sorption experiments were conducted to evaluate the sorption behavior of tetracycline (TC, H L) on sedimentsand soils in the presence and absence of cadmium (Cd), as affected by pH and properties of sedimentsThe results indicated stronger nonlinearity and higher capacity of TC sorption on sediments than on soilsThe presence of Cd (II) increased TC sorption on both sediments and soils, which resulted from the decrease

Keywords： sorption     tetracycline (TC)     pH     cadmium (Cd)     antibiotic    

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Impacts of CO2 and H2S on the risk of hydrate formation during pipeline transport of natural gas

Solomon A. Aromada, Bjørn Kvamme

Frontiers of Chemical Science and Engineering 2019, Volume 13, Issue 3,   Pages 616-627 doi: 10.1007/s11705-019-1795-2

Abstract: in natural gas before water condenses out at a given temperature and pressure is the initial step in hydratemaximum mole-fractions of water that can be tolerated during pipeline transport without the risk of hydrateThe maximum mole-fraction of water permitted in the gas to ensure prevention of hydrate formation also

Keywords： hydrate     hydrogen Sulphide     CO2     dew point     pipeline    

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in numerical simulations on multiphase flow and thermodynamics in production of natural gas from gas hydrate

Lin ZUO, Lixia SUN, Changfu YOU

Frontiers in Energy 2009, Volume 3, Issue 2,   Pages 152-159 doi: 10.1007/s11708-009-0017-x

Abstract: multiphase flow and thermodynamics have been conducted to investigate the feasibility of gas production from hydratenumerical method considering the multiphase flow and thermodynamics of gas production from various hydrate-bearingreservoirs is required to better understand the dissociation process of natural gas hydrate, which would

Keywords： numerical simulation     natural gas hydrate     dissociation     thermodynamics     multiphase flow    

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Efficient promotion of methane hydrate formation and elimination of foam generation using fluorinated

Quan CAO, Dongyan XU, Huanfei XU, Shengjun LUO, Rongbo GUO

Frontiers in Energy 2020, Volume 14, Issue 3,   Pages 443-451 doi: 10.1007/s11708-020-0683-2

Abstract: Methane hydrate preparation is an effective method to store and transport methane.In promoters to facilitate methane hydrate formation, homogeneous surfactant solutions, sodium dodecylFoaming, however, could not be avoided during hydrate dissociation with the presence of SDS.perfluorooctane sulfonate (AOS), and tetraethylammonium perfluorooctyl sulfonate (TOS) to promote methane hydrateIt was concluded that PBS, PHS, and POS produced no foam during hydrate dissociation, making them promising

Keywords： methane hydrate     fluorinated surfactants     homogeneous promoter     foam elimination     stability    

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Progress and prospect of hydrate-based desalination technology

Jibao ZHANG, Shujun CHEN, Ning MAO, Tianbiao HE

Frontiers in Energy 2022, Volume 16, Issue 3,   Pages 445-459 doi: 10.1007/s11708-021-0740-5

Abstract: Hydrate-based desalination (HBD) technology has drawn an increasing amount of attention due to its mildIn this paper, literature on hydrate-based desalination is comprehensively analyzed and critically evaluated, focuses on experimental progress in different hydrate formers that have an impact on thermodynamicsand dynamics in hydrate formation.Besides, the hydrate formation morphology and hydrate crystal structure with different hydrate formers

Keywords： gas hydrates     desalination     crystal morphology     molecular dynamic     cold energy    

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Assessment on contaminations in sediments of an intake and the inflow canals in Taihu Lake, China

Xiaolong WANG,Shiming DING,Qi ZHANG,Weiping HU

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 4,   Pages 665-674 doi: 10.1007/s11783-014-0701-x

Abstract: In the present study, we investigated the contaminations of nutrients and heavy metals in the sedimentsHowever, the concentrations of Cr, Ni, Cu, Zn and Pb in the sediments of the intake exceeded the lowestIn addition, the concentrations of Ni in the sediments of Tianji Canal and Jinshu Canal exceeded theMore importantly, the concentrations of Cu in the sediments of Tianji Canal exceeded three times of thenutrient accumulation, and the leakage of electronic trash dominated the enrichment of metals in the sediments

Keywords： drinking water resource     nutrients     heavy metals     sediments     Taihu Lake    

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Key issues in development of offshore natural gas hydrate

Shouwei ZHOU, Qingping LI, Xin LV, Qiang FU, Junlong ZHU

Frontiers in Energy 2020, Volume 14, Issue 3,   Pages 433-442 doi: 10.1007/s11708-020-0684-1

Abstract: As a new clean energy resource in the 21st century, natural gas hydrate is considered as one of the mostThis paper, based on the research progress in exploitation of natural gas hydrate (NGH) in China andthe world, systematically reviewed and discussed the key issues in development of natural gas hydratehydrate be introduced., and looking for gas hydrate dessert areas with commercial exploitation value should be enhanced.

Keywords： natural gas hydrate exploitation offshore     diagenetic and non-diagenetic hydrate     solid-state fluidizationmethod     dessert in enrichment area     three-gas combined production on gas hydrate abundance    

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The temporal changes of the concentration level of typical toxic organics in the river sediments around

Qiang Li, Xiong Xu, Yaoyao Fang, Ruiyang Xiao, Donghong Wang, Wenjue Zhong

Frontiers of Environmental Science & Engineering 2018, Volume 12, Issue 6, doi: 10.1007/s11783-018-1054-7

Abstract:

The current situation of typical organics in the sediments around

The change of different organics in the sediments

Keywords： Organic compounds     Endocrine disrupters     Sediments     Concentration     Temporal changes    

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Mechanism and control factors of hydrate plugging in multiphase liquid-rich pipeline flow systems: a

Shuwei ZHANG, Liyan SHANG, Zhen PAN, Li ZHOU, You GUO

Frontiers in Energy 2022, Volume 16, Issue 5,   Pages 747-773 doi: 10.1007/s11708-022-0830-z

Abstract: Therefore, hydrate plugging is a major concern for the hydrate slurry pipeline transportation technologyIn addition, it summarized the influences of fluid flow and water content on the risk of hydrate blockageReasons of diversity of hydrate plugging mechanism in oil-based system ought to be studied in-depth bycombining the discrepancy of water content and the microscopic characteristics of hydrate particles.At present, it is increasingly necessary to expand the application of the hydrate blockage formation

Keywords： hydrate     flow rate     water content     mechanism of pipeline blockage     rich liquid phase system    

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Title Author Date Type Operation

Analysis of physical properties of gas hydrate-bearing unconsolidated sediment samples from the ultra-deepwater

Journal Article

Fundamental characteristics of gas hydrate-bearing sediments in the Shenhu area, South China Sea

Xin LYU, Qingping LI, Yang GE, Junlong ZHU, Shouwei ZHOU, Qiang FU

Journal Article

Research progress on hydrate plugging in multiphase mixed rich-liquid transportation pipelines

Shuyu SONG, Zhiming LIU, Li ZHOU, Liyan SHANG, Yaxin WANG

Journal Article

Adsorption and partition of benzo(a)pyrene on sediments with different particle sizes from the Yellow

XIA Xinghui, HU Lijuan, MENG Lihong

Journal Article

Prediction of bed load sediments using different artificial neural network models

Reza ASHEGHI, Seyed Abbas HOSSEINI

Journal Article

Progress in use of surfactant in nearly static conditions in natural gas hydrate formation

Zhen PAN, Yi WU, Liyan SHANG, Li ZHOU, Zhien ZHANG

Journal Article

Sorption of tetracycline to sediments and soils: assessing the roles of pH, the presence of cadmium andproperties of sediments and soils

Guixiang ZHANG, Xitao LIU, Ke SUN, Ye ZHAO, Chunye LIN

Journal Article

Impacts of CO2 and H2S on the risk of hydrate formation during pipeline transport of natural gas

Solomon A. Aromada, Bjørn Kvamme

Journal Article

in numerical simulations on multiphase flow and thermodynamics in production of natural gas from gas hydrate

Lin ZUO, Lixia SUN, Changfu YOU

Journal Article

Efficient promotion of methane hydrate formation and elimination of foam generation using fluorinated

Quan CAO, Dongyan XU, Huanfei XU, Shengjun LUO, Rongbo GUO

Journal Article

Progress and prospect of hydrate-based desalination technology

Jibao ZHANG, Shujun CHEN, Ning MAO, Tianbiao HE

Journal Article

Assessment on contaminations in sediments of an intake and the inflow canals in Taihu Lake, China

Xiaolong WANG,Shiming DING,Qi ZHANG,Weiping HU

Journal Article

Key issues in development of offshore natural gas hydrate

Shouwei ZHOU, Qingping LI, Xin LV, Qiang FU, Junlong ZHU

Journal Article

The temporal changes of the concentration level of typical toxic organics in the river sediments around

Qiang Li, Xiong Xu, Yaoyao Fang, Ruiyang Xiao, Donghong Wang, Wenjue Zhong

Journal Article

Mechanism and control factors of hydrate plugging in multiphase liquid-rich pipeline flow systems: a

Shuwei ZHANG, Liyan SHANG, Zhen PAN, Li ZHOU, You GUO

Journal Article