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FORMATION LAW OF PHASES IN ULTRAFINE POWDERS OF Al-Cu ALLOY PREPARED BY gas EVAPORATION PROCESS

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中国有色金属学会会刊：英文版 1999年第2期9卷 128-133页

作者： Yan, Hongge Chen, Zhenhua Hu, Xiang Huang, Peiyun Central South Univ of Technology Changsha China

１ＩＮＴＲＯＤＵＣＴＩＯＮＵｌｔｒａｆｉｎｅｐｏｗｄｅｒｓｗｉｔｈａｐａｒｔｉｃｌｅｓｉｚｅｌｅｓｔｈａｎ１００ｎｍｈａｖｅｅｘｃｅｌｅｎｔｐｒｏｐｅｒｔｉｅｓｉｎｃｏｎｔｒａｓｔｔｏｃｏａｒｓｅｇｒａｉｎｍａｔｅｒ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＵｌｔｒａｆｉｎｅｐｏｗｄｅｒｓｗｉｔｈａｐａｒｔｉｃｌｅｓｉｚｅｌｅｓｔｈａｎ１００ｎｍｈａｖｅｅｘｃｅｌｅｎｔｐｒｏｐｅｒｔｉｅｓｉｎｃｏｎｔｒａｓｔｔｏｃｏａｒｓｅｇｒａｉｎｍａｔｅｒｉａｌｓ［１，２］ａｎｄｈａｖｅｗ...

关键词： gas evaporationvapor condensationultrafine powdersalloy powder

Solubility and mass transfer of H2, CH4, and their mixtures in vacuum gas oil: An experimental and modeling study

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Chinese Journal of Chemical Engineering 2019年第12期27卷 3000-3009页

作者： Zhigang Lei Yifan Jiang Yao Liu Yichun Dong Gangqiang Yu Yanyong Sun Ruili Guo State Key Laboratory of Chemical Resource Engineering Beijing Key Laboratory of Energy Environmental CatalysisBeijing University of Chemical TechnologyBeijing 100029China School of Chemistry and Chemical Engineering Shihezi UniversityShihezi 832003China

In this work,the solubility data and liquid-phase mass transfer coefficients of hydrogen(H2),methane(CH4)and their mixtures in vacuum gas oil(VGO)at temperatures(353.15-453.15 K)and pressures(1-7 MPa)were measured,which are necessary for catalytic cracking process simulation and *** solubility of H2 and CH4 in VGO increases with the increase of pressure,but decreases with the increase of ***’s constants of H2 and CH4 follow the relation of In H=-413.05/T+5.27 and In H=-990.67/T+5.87,*** molar fractions of H2 and system pressures at different equilibrium time were measured to estimate the liquid-phase mass transfer *** results showed that with the increase of pressure,the liquid-phase mass transfer coefficients ***,the solubility of H2 and CH4 in VGO was predicted by the predictive COSMO-RS model,and the predicted values agree well with experimental *** addition,the gas-liquid equilibrium(GLE)for H2+CH4+VGO system at different feeding gas ratios in volume fraction(i.e.,H285%+CH415%and H290%+CH410%)was *** selectivity of H2 to CH4 predicted by the COSMO-RS model agrees well with experimental *** work provides the basic thermodynamic and dynamic data for fuel oil catalytic cracking processes.

关键词： H2 CH4 Vacuum gas oil(VGO) Solubility Mass transfer COSMO-RS model

Support surface pore structures matter: Effects of support surface pore structures on the TFC gas separation membrane performance over a wide pressure range

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Chinese Journal of Chemical Engineering 2019年第8期27卷 1807-1816页

作者： Mengqi Shi Chenxi Dong Zhi Wang Xinxia Tian Song Zhao Jixiao Wang Chemical Engineering Research Center School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300350China Tianjin Key Laboratory of Membrane Science and Desalination Technology State Key Laboratory of Chemical EngineeringCollaborative Innovation Center of Chemical Science and EngineeringTianjin UniversityTianjin 300350China Research Institute of Shannxi Yanchang Petroleum(Group)Co.Ltd. Xi'an 710075China

In this work, the effects of support surface pore structures(including surface pore size, surface pore density and surface porosity) on the performance of thin film composite(TFC) gas separation membrane over a wide pressure range(from 0.3 to 2.0 MPa) were studied. To fulfill it, the polysulfone(PSf) supports with different surface pore structures were prepared. Two kinds of wide-accepted polymeric membrane materials, i.e., polyvinylamine(PVAm) and Pebax 1657 copolymer, were used as skin layer materials. We pointed out for the first time that the support surface average pore size and pore density could affect the chain mobility of polymer of skin layer at the support surface pore entrance, then, can affect the TFC membrane performance. Besides, we also discussed the effects of support on the TFC membrane performance when the feed pressure changes for the first time. This work can provide guidance for choosing a suitable support for TFC gas separation membrane.

关键词： Support surface pore structures Thin film composite gas separation membrane Polymer mobility

Effect of longwall-induced subsurface deformations on shale gas well casing stability under deep covers

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International Journal of Mining Science and Technology 2019年第1期29卷 3-8页

作者： Daniel W.H.Su Peter Zhang Mark Van Dyke Todd Minoski Center for Disease Control and Prevention(CDC) National Institute for Occupational Safety and Health(NIOSH)Pittsburgh Mining Research Division(PMRD)

This paper presents the results of a 2017 study conducted by the National Institute for Occupational Safety and Health(NIOSH), Pittsburgh Mining Research Division(PMRD), to evaluate the effects of longwall-induced subsurface deformations within a longwall abutment pillar under deep cover. The 2017 study was conducted in a southwestern Pennsylvania coal mine, which extracts 457 m-wide longwall panels under 361 m of cover. One 198 m-deep, in-place inclinometer monitoring well was drilled and installed over a 45 m by 84 m center abutment pillar. In addition to the monitoring well, surface subsidence measurements and underground coal pillar pressure measurements were conducted as the 457 m-wide longwall panel on the south side of the abutment pillar was being mined. Prior to the first longwall excavation, a number of simulations using FLAC3D^(TM) were conducted to estimate surface subsidence, increases in underground coal pillar pressure, and subsurface horizontal displacements in the monitoring well. Comparisons of the pre-mining FLAC3D simulation results and the surface, subsurface,and underground instrumentation results show that the measured in-place inclinometer casing deformations are in reasonable agreement with those predicted by the 3D finite difference models. The measured surface subsidence and pillar pressure are in excellent agreement with those predicted by the 3D *** from this 2017 research clearly indicate that, under deep cover, the measured horizontal displacements within the abutment pillar are approximately one order of magnitude smaller than those measured in a 2014 study under medium cover.

关键词： Longwall Deformations Shale gas wells Casing Safety and health

Risk assessment of gas control and spontaneous combustion of coal under gas drainage of an upper tunnel

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International Journal of Mining Science and Technology 2019年第3期29卷 491-498页

作者： Tingxiang Chu Pin Li Yuexia Chen School of Safety Engineering North China Institute of Science and TechnologySanhe 065201China School of Safety Science and Engineering Henan Polytechnic UniversityJiaozuo 454003China

The adjustment of the gas drainage rate has an immediate impact on air leakage in gob,thus resulting in the change of self-heating of *** regulating the gas drainage parameters,the risk of spontaneous combustion of coal should be *** risk assessment of gas control and spontaneous combustion of coal under gas drainage in a tunnel was investigated at different gas drainage *** distributions of the air volume along the working face,the gas management effects and the width of the oxidation zone were subjected to risk *** the simulation results showed,with increasing gas drainage rate,although the safety of gas dilution by ventilation was assured,the intensifying air leakage caused the oxidation zone to move into the deeper gob and led to an increase in the width of the oxidation zone.A risk assessment method was proposed to determine a suitable gas drainage rate for the upper *** correctness of the risk assessment and the validity of the numerical modelling were confirmed by the field measurements.

关键词： gas drainage Risk assessment Air leakage Oxidation zone Spontaneous combustion

Effect of Cr2O3 addition on oxidation induration and reduction swelling behavior of chromium-bearing vanadium titanomagnetite pellets with simulated coke oven gas

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International Journal of Minerals,Metallurgy and Materials 2019年第8期26卷 963-972页

作者： Wei-dong Tang Song-tao Yang Xiang-xin Xue School of Metallurgy Northeastern UniversityShenyang 110819China School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051China

The oxidation induration and reduction swelling behavior of chromium-bearing vanadium titanomagnetite pellets(CVTP)with Cr2O3 addition were studied,and the reduction swelling index(RSI)and compressive strength(CS)of the reduced CVTP with simulated coke oven gas(COG)injection were *** results showed that the CS of the CVTP decreases and the porosity of the CVTP increases with increasing amount of Cr2O3 *** Cr2O3 mainly exists in the form of(Cr,Fe)2O3 solid solution in the CVTP and as Fe-Cr in the reduced *** CS of the reduced CVTP increases and the RSI of the reduced CVTP decreases with increasing amount of Cr2O3 *** limited aggregation and diffusion of metallic iron contribute to the formation of dense lamellar crystals,which leads to the slight decrease for reduction swelling behavior of reduced *** work provides a theoretical and technical basis for the utilization of CVTP and other Cr-bearing ores such as chromite with COG recycling technology.

关键词： chromium oxide oxidation induration reduction swellability coke oven gas chromium-bearing vanadium titanomagnetite pellets

The status of exploitation techniques of natural gas hydrate

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Chinese Journal of Chemical Engineering 2019年第9期27卷 2133-2147页

作者： Lei Yang Yulong Liu Hanquan Zhang Bo Xiao Xianwei Guo Rupeng Wei Lei Xu Lingjie Sun Bin Yu Shudong Leng Yanghui Li Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education Dalian University of TechnologyDalian 116024China Guangzhou Marine Geological Survey Guangzhou 510075China China Ship Design&Research Center Co. Ltd.Dalian 116001China

Natural gas hydrate(NGH)has been widely considered as an alternative form of energy with huge potential,due to its tremendous reserves,cleanness and high energy *** countries involving Japan,Canada,India and China have launched national projects on the exploration and exploitation of gas hydrate *** the beginning of this century,an early trial production of hydrate resources was carried out in Mallik permafrost region,*** has conducted the first field test from marine hydrates in 2013,followed by another trial in *** also made its first trial production from marine hydrate sediments in *** the low production efficiency,ice/hydrate regeneration,and sand problems are still commonly encountered;the worldwide progress is far before *** to now,many gas production techniques have been proposed,and a few of them have been adopted in the field production ***,hardly any method appears really promising;each of them shows limitations at certain ***,further efforts should be made on the economic efficiency as well as sustainability and environmental *** this paper,the investigations on NGH exploitation techniques are comprehensively reviewed,involving depressurization,thermal stimulation,chemical inhibitor injection,CO2–CH4 exchange,their combinations,and some novel *** behavior of each method and its further potential in the field test are *** advantages and limitations of laboratory studies are also *** work could give some guidance in the future formulation of exploitation scheme and evaluation of gas production behavior from hydrate reservoirs.

关键词： Natural gas hydrate Production technique Depressurization Thermal stimulation CO2 exchange

The effects of gas flow pattern on the generation of ozone in surface dielectric barrier discharge

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Plasma Science and Technology 2019年第5期21卷 168-178页

作者： Songru XIE Yong HE Dingkun YUAN Zhihua WANG Yanqun ZHU Kefa CEN State Key Laboratory of Clean Energy Utilization Zhejiang University

Ozone production utilizing surface dielectric barrier discharge（SDBD） was experimental studied for different flow patterns considering the influences of transversal flow, lateral flow and different lateral flow positions. Results show that the flow patterns have a remarkable impact on the ozone yield by affecting the uniformity and turbulence of gas flow. Meanwhile, distributing the O2 flow rate according to the intensity of the plasma reaction would also increase the generation efficiency of SDBD for ozone production. By improving the uniformity and introducing the lateral flow to the transversal flow, the highest ozone yield was obtained in flow pattern ‘F’. In this case, the ozone yield increased by 28.4% to 131 g kWh-1 from 102.8 g k Wh-1 in flow pattern ‘A’.

关键词： surface dielectric barrier discharge gas flow ozone generation

CFD simulations for longwall gas drainage design optimisation

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International Journal of Mining Science and Technology 2017年第5期27卷 777-782页

作者： Qin Johnny Qu Qingdong Guo Hua Coal Mining Research Program The Commonwealth Scientific and Industrial Research Organisation(CSIRO)Brisbane 883Australia

Computational fluid dynamics(CFD) simulation is an effective approach to develop and optimise gas drainage design for underground longwall coal mining. As part of the project supported by the Australian Government Coal Mining Abatement Technology Support Package(CMATSP), threedimensional CFD simulations were conducted to test and optimise a conceptual design which proposes using horizontal boreholes to replace vertical boreholes at an underground coal mine in *** performance between a vertical borehole and a horizontal borehole was first carried out to compare their capacity and effectiveness. Then a series of cases with different horizontal borehole designs were simulated to optimise borehole configuration parameters such as location, diameter, and number of boreholes. The study shows that the horizontal borehole is able to create low pressure sinks that protect the workings from goaf gas ingresses by changing goaf gas flow directions, and that it has the advantage to continuously maintain such low pressure sinks near the tailgate as the longwall advances. An example of optimising horizontal borehole locations in the longwall lateral direction is also given in this paper.

关键词： Goaf gas drainage Horizontal borehole CFD simulation Design optimisation Mining abatement technology