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Role of iron ore in enhancing gasification of iron coke:Structural evolution,influence mechanism and kinetic analysis

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 58-69页

作者： Jie Wang Wei Wang Xuheng Chen Junfang Bao Qiuyue Hao Heng Zheng Runsheng Xu School of Chemistry and Materials Science Hubei Engineering UniversityXiaogan 432000China Key laboratory for Ferrous Metallurgy and Resources utilization of ministry of education Wuhan University of Science and TechnologyWuhan 430081China Institue of Ironmaking Technology Baosteel Central Research InstituteShanghai 201999China State Key laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

The utilization of iron coke provides a green pathway for low-carbon *** uncover the influence mechanism of iron ore on the behavior and kinetics of iron coke gasification,the effect of iron ore on the microstructure of iron coke was ***,a comparative study of the gasification reactions between iron coke and coke was conducted through non-isothermal thermogravimetric *** findings indicate that compared to coke,iron coke exhibits an augmentation in micropores and specific surface area,and the micropores further extend and *** provides more adsorption sites for CO_(2) molecules during the gasification process,resulting in a reduction in the initial gasification temperature of iron *** the heating rate in non-isothermal gasification can enhance the reactivity of iron *** metallic iron reduced from iron ore is embedded in the carbon matrix,reducing the orderliness of the carbon structure,which is primarily responsible for the heightened reactivity of the carbon *** kinetic study indicates that the random pore model can effectively represent the gasification process of iron coke due to its rich pore ***,as the proportion of iron ore increases,the activation energy for the carbon gasification gradually decreases,from 246.2 kJ/mol for coke to 192.5 kJ/mol for iron coke 15wt%.

关键词： low-carbon ironmaking iron coke gasification structural evolution kinetic model

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Influence factors of methane hydrate formation from ice:Temperature,pressure and SDS surfactant

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Chinese Journal of Chemical Engineering 2019年第2期27卷 405-410页

作者： Weiguo Liu Yanghui Li Xiaohu Xu Key laboratory of ocean energy utilization and energy Conservation of ministry of education Dalian University of Technology

A series of experiments of forming hydrate from ice powders in different conditions have been carried out with constant volume method to evaluate the influence factors such as pressure, temperature, and SDS surfactant. The change of temperature and pressure were collected as a function of elapsed time, which were used to calculate the gas consumption and hydrate saturation during hydrate formation(pVT method). Based on the experimental results and the analysis, it is concluded that:(1) Both initial pressure and temperature have effect on the hydrate formation and temperature plays a more important role in the process;(2) heating and secondary pressurization will promote the gas hydrate formation and enhance the hydrate saturation as a result. Meanwhile, the promotion of heating seems to be more obvious than that of secondary pressurization;(3) different concentrations of SDS surfactant have clearly influence on the saturation of gas hydrate and there is an optimal concentration to promote the hydrate formation.

关键词： Methane hydrate Ice Heating Secondary pressurization Surfactant

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Dissociation characteristics of methane hydrate using depressurization combined with thermal stimulation

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Chinese Journal of Chemical Engineering 2019年第9期27卷 2089-2098页

作者： Mingjun Yang Zhanquan Ma Yi Gao Lanlan Jiang Key laboratory of ocean energy utilization and energy Conservation of ministry of education Dalian University of Technology

Methane hydrate is considered as a potential energy source in the future due to its abundant reserves and high energy *** investigate the influence of initial hydrate saturation,production pressure,and the temperature of thermal stimulation on gas production rate and cumulative gas production percentage,we conducted the methane hydrate dissociation experiments using depressurization,thermal stimulation and a combination of two methods in this *** is found that when the gas production pressures are the same,the higher the hydrate initial saturation,the greater change in hydrate reservoir ***,it is easier to appear the phenomenon of icing and hydrate reformation when the hydrate saturation is *** example,the reservoir temperature dropped to below zero in depressurization process when the hydrate saturation was about 37%.However,the same phenomenon didn’t appear as the saturation was about 12%.This may be due to more free gas in the reservoir with hydrate saturated of 37%.We also find that the temperature variation of reservoir can be reduced effectively by combination of depressurization and thermal stimulation *** the average gas production rate is highest with combined method in the *** the pressure of gas production is 2 MPa,compared with depressurization,the average of gas production can increase 54%when the combined method is *** efficiency of gas production is very low when thermal stimulation was used *** the temperature of thermal stimulation is 11℃,the average rate of gas production in the experiment of thermal stimulation is less than 1/3 of that in the experiment of the combined method.

关键词： Methane hydrate Depressurization Thermal stimulation Dissociation characteristics

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2-D Numerical Simulation of Natural Gas Hydrate Decomposition Through Depressurization by Fully Implicit Method

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China ocean Engineering 2009年第3期23卷 529-542页

作者：宋永臣梁海峰 Key laboratory of ocean energy utilization and energy Conservation of ministry of education Dalian University of Technology

Natural gas hydrate, as a potential energy resource, deposits in permafrost and marine sediment with large quantities. The current exploitation methods include depressurization, thermal stimulation, and inhibitor injection. However, many issues have to be resolved before the commercial production. In the present study, a 2-D axisymmetric simulator for gas production from hydrate reservoirs is developed. The simulator includes equations of conductive and convective heat transfer, kinetic of hydrate decomposition, and multiphase flow. These equations are discretized based on the finite difference method and are solved with the fully implicit simultaneous solution method. The process of laboratory-scale hydrate decomposition by depressurization is simulated. For different surrounding temperatures and outlet pressures, time evolutions of gas and water generations during hydrate dissociation are evaluated, and variations of temperature, pressure, and multiphase fluid flow conditions are analyzed. The results suggest that the rate of heat transfer plays an important role in the process. Furthermore, high surrounding temperature and low outlet valve pressure may increase the rate of hydrate dissociation with insignificant impact on final cumulative gas volume.

关键词： natural gas hydrate depressurization fully implicit simuhaneoas solution method impact parameters analysis

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Low-temperature chlorination roasting technology for the simultaneous recovery of valuable metals from spent LiCoO_(2)cathode material

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 80-91页

作者： Junjie Shi Changle Hou Jingjing Dong Dong Chen Jianzhong Li Key laboratory for Ecological Metallurgy of Multimetallic Mineral(ministry of education) Northeastern UniversityShenyang 110819China School of Metallurgy Northeastern UniversityShenyang 110819China

With the continuous increase in the disposal volume of spent lithium-ion batteries(LIBs),properly recycling spent LIBs has become essential for the advancement of the circular *** study presents a systematic analysis of the chlorination roasting kinetics and proposes a new two-step chlorination roasting process that integrates thermodynamics for the recycling of LIB cathode *** activation energy for the chloride reaction was 88.41 kJ/mol according to thermogravimetric analysis–derivative thermogravimetry data obtained by using model-free,model-fitting,and Z(α)function(αis conversion rate).Results indicated that the reaction was dominated by the first-order(F1)model when the conversion rate was less than or equal to 0.5 and shifted to the second-order(F2)model when the conversion rate exceeded *** conditions were determined by thoroughly investigating the effects of roasting temperature,roasting time,and the mass ratio of NH_(4)Cl to LiCoO_(2).Under the optimal conditions,namely 400℃,20 min,and NH_(4)Cl/LiCoO_(2)mass ratio of 3:1,the leaching efficiency of Li and Co reached 99.43% and 99.05%,*** of the roasted products revealed that valuable metals in LiCoO_(2)transformed into CoCl_(2) and ***,the reaction mechanism was elucidated,providing insights for the establishment of a novel low-temperature chlorination roasting technology based on a crystal structure *** technology can guide the development of LIB recycling processes with low energy consumption,low secondary pollution,high recovery efficiency,and high added value.

关键词： spent lithium-ion battery thermodynamics chlorination roasting kinetics circular economy

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Pressure-driven anomalous thermal transport behaviors in gallium arsenide

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Journal of Materials Science & Technology 2023年第11期142卷 89-97页

作者： Zhongyin Zhang Xuanhui Fan Jie Zhu Kunpeng Yuan Jing Zhou Dawei Tang Key laboratory of ocean energy utilization and energy Conservation of ministry of education Dalian University of TechnologyDalian 116023China

High-pressure has been widely utilized to improve material performances such as thermal conductiv-ityκand interfacial thermal conductance *** arsenide(GaAs)as a functional semiconductor has attracted extensive attention in high-pressure studies for its technological importance and complex structure *** properties of GaAs under high pressure are urgent needs in physics but remain ***,we systematically investigateκGaAs and G Al/GaAs of multi-structure up to -23 *** conclude that:(1)in pressurization,phonon group velocity,lattice defects,and electrons play a central role inκGaAs in elastic,plastic,and metallization regions,*** increased phonon density of states(PDOS)overlap,group velocity,and interfacial bonding enhances G Al/GaAs.(2)In depressurization,electrons remain the dominant factor on κ GaAs from 23 to 13.5 GPa.G Al/GaAs increases dramatically at -12 GPa due to the larger PDOS *** decompressing to ambient,lattice defects including grain size reduction,arsenic vacancies,and partial amorphization reduce κ GaAs to a glass-like ***,the released G Al/GaAs is 2.6 times higher than that of the *** our findings open a new dimension in synergistically realizing glass-like κ and enhancing G,which can facilitate thermoelectric performance and its potential engineering applications.

关键词： Gallium arsenide High pressure Thermal conductivity Interfacial thermal conductance Time domain thermoreflectance

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Electric conductivity and electric convertibility of potassium acetate in water, ethanol, 2,2,2–trifluoroethanol, 2–propanol and their binary blends

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Chinese Journal of Chemical Engineering 2018年第12期26卷 2581-2591页

作者： Xi Wu Shiming Xu Debing Wu Huan Liu Key laboratory of ocean energy utilization and energy Conservation of ministry of education School of Energy and Power Engineering Dalian University of Technology

Salinity gradient energy between the concentrated and diluted electrolyte solutions can be converted to electric energy by using reverse electrodialysis(RED) technology. Electrolyte solution is a vital factor that impacts the energy conversion efficiency. Potassium acetate(KAc) was chosen as solute, and water, ethanol, 2,2,2-trifluoroethanol(TFE), 2-propanol(IPA) and several of their binary mixtures were selected as solvents. Electric conductivity of these solutions were measured under varying conditions. KAc was easily ionized in water and possessed the maximum electric conductivity, following by KAc–H_2O–TFE and KAc–H_2O–ethanol, and then KAc in pure TFE, ethanol, and IPA respectively. For electric convertibility of these solutions working in a RED power generation system, it was found that the KAc–H_2O possessed the maximum power density, and the KAc–ethanol–H_2O possessed the larger open circuit voltage than aqueous KAc solution under the same working condition. Besides, it was observed that both the electric conductivity and electric convertibility were significantly influenced by the concentration and temperature of solution. With the increasing of concentration,electric conductivity of these solutions increased firstly and then reached to the peak, but later it *** temperature took a positive impact role to the electric conductivity. Electric conductivity of these solutions can be estimated by using a modified amplitude version of Gaussian peak function.

关键词： Conductivity Alcohol Electrochemistry Solution Mixtures

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Forced Convection Heat Transfer in Porous Structure: Effect of Morphology on Pressure Drop and Heat Transfer Coefficient

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Journal of Thermal Science 2021年第2期30卷 363-393页

作者： ZHAO Jiafei SUN Mingrui ZHANG Lunxiang HU Chengzhi TANG Dawei YANG Lei SONG Yongchen Key laboratory of ocean energy utilization and energy Conservation of ministry of education Dalian University of TechnologyDalian 116023China

A light-weight structure with sufficient mechanical strength and heat transfer performance is increasingly required for some thermal management *** porous structure with the skeleton supporting the ambient stress and the pores holding the flowing fluid is considered very promising,attracting significant scientific and industrial interest over the past few ***,due to complicated morphology of the porous matrices and thereby various performance of the pressure drop and heat transfer coefficients (HTC),the comprehensive comparison and evaluation between different structures are largely *** this work,recent researches on the efforts of forced convection heat transfer in light-weight porous structure are reviewed;special interest is placed in the open-cell foam,lattice-frame,structured packed bed,and wire-woven *** experimental apparatus,morphological of the porous structures,effect of morphology on pressure drop and HTC,and further applications are *** new method which measure morphology accurately should be paid more attention to develop more accuracy ***,the most research focused on low Reynolds number and existing structure,while very few researchers investigated the property of forced convection heat transfer in high velocity region and developed new porous structure.

关键词： forced convection heat transfer heat transfer coefficient pressure drop morphological characteristics porous structure

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Magnetic Resonance Imaging Study on the Miscibility of a CO_(2)/n-Decane System

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Chinese Physics Letters 2011年第9期28卷 209-212页

作者： SONG Yong-Chen ZHU Ning-Jun LIU Yu ZHAO Jia-Fei LIU Wei-Guo ZHANG Yi ZHAO Yue-Chao JIANG Lan-Lan Key laboratory of ocean energy utilization and energy Conservation of ministry of education Dalian University of TechnologyDalian 116024

We provide a feasible method to estimate the minimum miscibility pressure(MMP)of a CO_(2)/n−decane system by using high spatial resolution magnetic resonance imaging(MRI).During the measurement,the signal intensity of n-decane with CO_(2) dissolved is *** MRI images show that the signal intensity of n−decane decreases to zero and the interface disappears at the MMP.A good exponential growth relation is found between the signal intensity and the pressure of the CO_(2)/n−decane *** relationship between the MMP and the temperature is established quantitatively,which is in close agreement with previous *** it could be used to predict the MMP of the CO_(2)/n-decane system.

关键词： exponential dissolved quantitatively

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Molecular dynamics simulation of effects of nanoparticles on frictional heating and tribological properties at various temperatures

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Friction 2020年第3期8卷 531-541页

作者： Chengzhi HU Jizu LV Minli BAI Xiaoliang ZHANG Dawei TANG laboratory of ocean energy utilization of ministry of education School of Energy and Power EngineeringDalian University of TechnologyDalian 116024China

The temperature of a friction pair exerts considerable influence on the tribological behavior of a *** two cases,one with and the other without Cu(copper)nanoparticles,the temperature increase in friction pairs caused by frictional heating and its tribological properties at various temperatures are studied by using the molecular dynamics *** results show that temperature distribution and surface abrasion are significantly improved by the presence of Cu *** is one of the reasons for the improvements in tribological properties achieved in the presence of *** temperature and range of influence of frictional heating for the model without nanoparticles are significantly increased with the increase in the sliding velocity;however,in the model with nanoparticles,the temperature gradient is confined to the area near the Cu *** an increase in the temperature of the friction pair,the improvement in anti-wear properties associated with the presence of Cu nanoparticles becomes more significant.

关键词： nanoparticles molecular dynamics temperature tribological properties

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