检索结果-南通市图书馆

dyeing PET Textile with *** red 60 and C.I. disperse Orange 25 in Supercritical CO_2

在线全文

学校读者我要写书评

暂无评论

Journal of donghua University(English Edition) 2008年第4期25卷 379-383页

作者：李志义孟庭宇刘学武夏远景胡大鹏 r&d Institute of Fluid and powder Engineering Dalian University of Technology

For a better understanding of the feasibility of supercritieal fluid dyeing （SFd） and more available information for the process development, the experiments of dyeing PET textile with C.I. disperse red 60 （anthraquinone type） and C. I. disperse orange 25 （azo type） in supercritieal CO2 were carried out with a high-pressure dyeing apparatus at temperatures from 80 to 130℃ and pressure up to 31 MPa. The effect of operating conditions on color yield （K/S） was investigated in SFd experiment, and the optimum operating conditions for the above two disperse dyes were obtained as follows： the temperature 120℃, the pressure 25 MPa and the dyeing time 100 min. As compared with SFd, the conventional water dyeing （CWd） was carried out with the same dyes and textile. The results show that the better fastness, levelness and apparent color can be achieved in SFd and the SFd process has many significant advantages over the CWd process.

关键词： supercritical fluid dyeing conventional water dyeing C I. disperse red 60 C.I. disperse orange 25 PET textile

Spherical modification of tungsten powder by particle composite system

在线全文

学校读者我要写书评

暂无评论

rare Metals 2022年第6期41卷 1972-1976页

作者： Cong-Cong Wang Cheng-Chang Jia Peng Gao Guo-Sheng Gai Yu-Fen Yang School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China powder technology r&d group Department of Material Science and EngineeringTsinghua UniversityBeijing 100084China

Owing to contradiction between increasing demand of spherical tungsten powder and limitation of traditional manufacturing technology,a novel preparation method was developed to sphericize the polygonal tungsten powder by means of modification of particle composite *** powder particles were modified by par-ticle composite system,and detailed characterization by scanning electron microscopy(SEM)was *** size distribution and function mechanism were analyzed,and the internal relationship between average diameter and processing time was *** results show that the spherical tungsten powder with an average diameter of 6.41μm is obtained from polyhedral tungsten powder with an average diameter of 7.50μ*** spherical effect could be achieved(sharp edge angles of particles are rounded off and reshaped)when the processing time is over 30 *** relationship between average diameter(d)and pro-cessing time can be described by the exponential decay model,which provides a good interpretation for the process of *** relationship between them can be expressed by the equation d=1.87406exp(-x/8.92718)+*** proposed method could readily enable large-scale production of spherical tungsten powder.

关键词： Tungsten powder Modification Average diameter powder metallurgy

Autotuning algorithm of particle swarm PId parameter based on d-Tent chaotic model

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2013年第5期24卷 828-837页

作者： Min Zhu Chunling Yang Weiliang Li School of Electrical Engineering and Automation Harbin Institute of Technology China FAW group Corporation r&d Center

An improved particle swarm algorithm based on the d-Tent chaotic model is put forward aiming at the standard particle swarm algorithm. The convergence rate of the late of proposed algorithm is improved by revising the inertia weight of global optimal particles and the introduction of d-Tent chaotic sequence. Through the test of typical function and the autotuning test of proportionalintegral-derivative （PId） parameter, finally a simulation is made to the servo control system of a permanent magnet synchronous motor （PMSM） under double-loop control of rotating speed and current by utilizing the chaotic particle swarm algorithm. Studies show that the proposed algorithm can reduce the iterative times and improve the convergence rate under the condition that the global optimal solution can be got.

关键词： d-Tent particle swarm proportional-integral- derivative (PId) parameter optimization.

The Mechanism of Heating rate on the Secondary recrystallization Evolution in Grain Oriented Silicon Steel

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of technology(Materials Science) 2025年第1期 275-282页

作者：高倩 LI Jun WANG Xianhui CAO Laifu GONG Jian LI Bo Central Iron and Steel research Institute group Shougang Zhixin Electromagnetic Material r&d (Beijing) Co. Ltd. Beijing Shougang Co. Ltd.

Grain-oriented silicon steels were prepared at different heating rates during high temperature annealing, in which the evolution of magnetic properties, grain orientations and precipitates were studied. To illustrate the Zener factor, the diameter and number density of precipitates of interrupted testing samples were statistically calculated. The effect of precipitate ripening on the Goss texture and magnetic property was investigated. data indicated that the trend of Zener factor was similar under different heating rates, first increasing and then decreasing, and that the precipitate maturing was greatly inhibited as the heating rate increased. Secondary recrystallization was developed at the temperature of 1 010 ℃ when a heating rate of 5 ℃/h was used, resulting in Goss, Brass and {110} oriented grains growing abnormally and a magnetic induction intensity of 1.90T. Furthermore, increasing the heating rate to 20 ℃/h would inhibit the development of undesirable oriented grains and obtain a sharp Goss texture. However, when the heating rate was extremely fast, such as 40 ℃/h, poor secondary recrystallization was developed with many island grains, corresponding to a decrease in magnetic induction intensity to 1.87 T. At a suitable heating rate of 20 ℃/h, the sharpest Goss texture and the highest magnetic induction of 1.94 T with an onset secondary recrystallization temperature of 1 020 ℃ were found among the experimental variables in this study. The heating rate affected the initial temperature of secondary recrystallization by controlling the maturation of precipitates, leading to the deviation and dispersion of Goss texture, thereby reducing the magnetic properties.

关键词：

Pressure and Arc Voltage Measurement in a 252 kV SF_6 Puffer Circuit Breaker

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Plasma Science and technology 2016年第5期18卷 490-493页

作者：钟建英郭煜敬张豪 r&d Center Pinggao Group Co.Ltd

The pressure distribution in an arcing chamber is critically important for the SF6 puffer circuit breaker design. In this paper, the pressure variation of four locations in the nozzle was measured by piezoresistive and fiber optical pressure sensors at two current levels of 10 kA and 50 kA. An arc voltage measurement was also taken. The results demonstrate that using either type of sensor with a connecting tube is able to detect the fast pressure variation in circuit breakers, however the possible distortion and delay to the pressure transient caused by the tube need further study.

关键词： piezoresistive pressure sensor fiber optical pressure sensor puffer high voltagecircuit breaker pressure Pitot tube arc voltage

Analysis,Prediction and Process Optimization Concerning Ammonium Chloride Corrosion in Ebullated-Bed Hydrogenation Unit for Treating residual Oil

在线全文

学校读者我要写书评

暂无评论

China Petroleum Processing & Petrochemical technology 2020年第4期22卷 108-116页

作者： Bao Zhenyu Wang Ning Zhang Hongfei duan Yongfeng Yu Fengchang r&d Center of Luoyang technology SINOPEC Engineering(Group)Co.LTD.Luoyang 471003

Ammonium chloride corrosion in the reactor effluent system remains to be a barrier for the safe operation of the ebullated-bed hydrogenation unit as impurity content is higher compared with that of the ordinary hydrogenation *** this research,a Sinopec envisaged case study was conducted on feed oil containing 2.92μg/g of Cl and 0.38%of N,because the impurity content of feed oil was representative in residue *** deposition patterns in heat exchangers were investigated by changing process variables,and then water wash strategy was optimized in view of the relative humidity to obtain a minimum water flowrate,and finally the process optimization suggestions concerning the operation of heat exchangers were *** show that with the measured content of nitrogen and chlorine in the feed,the NH4Cl deposition temperature of hot high-pressure vapor and hot low-pressure vapor was 223.4℃ and 173.7℃,respectively,and the minimum water wash flowrate for heat exchangers of hot high-pressure vapor with mixed hydrogen and hot low-pressure vapor with cold low-pressure oil was 38.0 t/h and 5.4 t/h,*** wash should be carried out intermittently upstream of the heat exchanger tube *** consideration of energy consumption,it is recommended to reduce the tube pass outlet temperature of the above heat exchangers to 240℃ and 190℃,respectively.

关键词： ebullated-bed hydrogenation corrosion ammonium salt water wash deposition temperature

Mn-doped SrCoO_(3-δ) Perovskite Oxides for Ethylene Production via Chemical Looping Oxidative dehydrogenation of Ethane

在线全文

学校读者我要写书评

暂无评论

China Petroleum Processing & Petrochemical technology 2024年第3期26卷 53-62页

作者： Li Zhi Liu Linjiao Hao daijun ren Xiaohang Shen Fangxia Li Xin Yu Anping Luoyang r&d Center of technology of Sinopec Engineering(group)Co.Ltd. Luoyang 471003China

Chemical looping oxidative dehydrogenation (CL-OdH) is an economically promising method for convertingethane into higher value-added ethylene utilizing lattice oxygen in redox catalysts, also known as oxygen carriers. Inthis study, perovskite-type oxide SrCoO_(3-δ) and B-site Mn ion-doped oxygen carriers (SrCo_(1-x)MnxO_(3-δ), x=0.1, 0.2, 0.3)were prepared and tested for the CL-OdH of ethane. The oxygen-deficient perovskite SrCoO_(3-δ) exhibited high ethyleneselectivity of up to 96.7% due to its unique oxygen vacancies and lattice oxygen migration rates. However, its low ethyleneyield limits its application in the CL-OdH of ethane. Mn doping promoted the reducibility of SrCoO_(3-δ) oxygen carriers,thereby improving ethane conversion and ethylene yield, as demonstrated by characterization and evaluation experiments.X-ray diffraction results confirmed the doping of Mn into the lattice of SrCoO_(3-δ), while X-ray photoelectron spectroscopy(XPS) indicated an increase in lattice oxygen ratio upon incorporation of Mn into the SrCoO_(3-δ) lattice. Additionally, H2temperature-programmed reduction (H2-TPr) tests revealed more peaks at lower temperature reduction zones and a declinein peak positions at higher temperatures. Among the four tested oxygen carriers, SrCo0.8Mn0.2O_(3-δ) exhibited satisfactoryperformance with an ethylene yield of 50% at 710 °C and good stability over 20 redox cycles. The synergistic effect of Mnplays a key role in increasing ethylene yields of SrCoO_(3-δ) oxygen carriers. Accordingly, SrCo0.8Mn0.2O_(3-δ) shows promisingpotential for the efficient production of ethylene from ethane via CL-OdH.

关键词： ethane ethylene perovskite chemical looping oxidative dehydrogenation

research of Arc Chamber Optimization Techniques Based on Flow Field and Arc Joint Simulation

在线全文

学校读者我要写书评

暂无评论

Plasma Science and technology 2016年第3期18卷 319-324页

作者：钟建英郭煜敬张豪 r&d Center Pinggao Group Co.Ltd.

The preliminary design of an arc chamber in the 550 kV SF6 circuit breaker was proposed in accordance with the technicai requirements and design experience. The structural optimization was carried out according to the no-load flow field simulation results and verified by no-load pressure measurement. Based on load simulation results such as temperature field variation at the arc area and the tendency of post arc current under different recovery voltage, the second optimal design was completed and its correctness was certificated by a breaking test. results demonstrate that the interrupting capacity of an arc chamber can be evaluated by the comparison of the gas medium recovery speed and post arc current growth rate.

关键词： flow filed arc simulation high voltage SF6 circuit breaker post arc current

Magnetic Properties of FeSiBC Amorphous Alloy powder Cores Using Mechanical-crushed powder

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel research International 2014年第11期21卷 1055-1058页

作者： Chun-bo HUANG Tian-cheng LIU Xiang-yue WANG Cao-wei LU de-ren LI Zhi-chao LU China Iron and Steel research Institute group r&d Center of Advanced technology and Materials Co. Ltd.

The FeSiBC amorphous powder cores were fabricated using powders of the FeSiBC amorphous ribbons which were mechanically crushed for a short time, and the relationship between magnetic properties and powder particle sizes was evaluated. The saturation magnetization Bs of the amorphous Fe82Si2B15C1 alloy was 1.62 T, which provided a superior dc-bias property for the powder cores. Meanwhile, a stable permeability up to high frequency range over 10 MHz and the low core loss of 400 kW/ma at f=50 kHz and Bm =0.1 T were obtained. These excellent high-frequency magnetic properties of the FeSiBC amorphous powder cores could be attributed to the effective electrical insulation between the FeSiBC amorphous powders made by mechanical crushing.

关键词： amorphous powder core mechanical crushing dc-bias property high frequency property