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Flow Properties of High Sulfur Petroleum Coke in a Strong-mixing Reactor
高硫焦用强混反应器流动特性

WANG Tao,LU Chun-xi,SHI Ming-xian,
王涛
,卢春喜,时铭显

过程工程学报 , 2004,
Abstract: A new cold strong-mixing reactor for burning high sulfur coke was designed based on the development of fluidization and the application of correlative new technology. The reactor consists of a mixed zone and a lift zone. Experiments were systematically conducted to investigate hydrodynamic behaviors of the high sulfur coke simulating particles in the mixed zone, with superficial gas velocity from 6 to 20 m/s and solids circulating rate from 20 to 232 kg/(m2.s). The experimental results demonstrated that the mixed zone can be divided into two sections in the axial direction and two or three regions in the radial direction. A Uniformity Index of the Radial Distribution(UIRD) was proposed to characterize radial flow structures for solids local density and particle velocity.
Structural Optimization of a Novel Gas-Solid Separator Incorporating Inertial and Centrifugal Separation
基于离心与惯性作用的新型气固分离装置的结构

LIU Xian-cheng,LU Chun-xi,SHI Ming-xian,Beijing,China,
刘显成
,卢春喜,时铭显

过程工程学报 , 2005,
Abstract: As the feed stuffs of fluid catalytic cracking (FCC) become increasingly heavier, a new regeneration technology combining post coke-burning riser and conventional turbulent bed regenerator has been developed in this study. One of the key components of this technology is the gas-solid separator located at the outlet of the riser regenerator, having the advantages such as simple structure, high separation efficiency, low pressure drop and flexible operation. To meet these requirements a novel gas-solid separator incorporating inertial and centrifugal separation was investigated in detail. Talcum powder was employed as solid medium. Separation efficiency and pressure drop were experimentally tested in nine separator configurations under the same gas velocity and particle concentration at the separator inlet. The results show that a reasonable scheme is as follows: no baffle to block the solid circulation, no hem at the slots to obstruct gas entering the centre pipe, and dimensionless radius of centre pipe between 0.50 and 0.55.
Flow Behavior of High-sulfur Petroleum Coke with Different Particle Size Distributions in a Novel Strong Mixing Reactor
不同粒度分布高硫焦颗粒在强混燃烧器内的流动特性

RUAN Yu-jun,LU Chun-xi,SHI Ming-xian,
阮宇军
,卢春喜,时铭显

过程工程学报 , 2006,
Abstract: The flow behaviors of high-sulfur petroleum coke with three different particle size distributions in a novel strong-mixing riser reactor were systematically investigated.The reactor was mainly composed of the pre-mixed zone and the lift zone,the structural dimensions of the two zones were respectively 240 mm ID,3000 mm length and 70 mm ID,9000 mm length.The experiment was carried out with the superficial gas velocity from 8 to 18 m/s and solids circulating rate from 60 to 200 kg/(m2?s).Through the experimental measurements on the axial and radial distributions of solids holdup and velocity in the strong-mixing riser reactor,it is found that,with increasing the proportion of fine powder in the coarse particles appropriately,the cross-section mean solids velocity will reduce,and the solids holdup will increase,moreover the back-mixing of particle is intensified and the residence time of particle will extend,which are beneficial to sufficient combustion of high-sulfur petroleum coke.
Chinese Internet router-level hop count measurement and analysis
中国Internet路由级跳数测量与分析*

MA Jian-guo,XI Ming-xian,LIN Yi-min,LI You-ping,
马建国
,席明贤,林益民,李幼平

计算机应用研究 , 2008,
Abstract: Measured sampled 6 754 active hosts at 7 measure sources with technology of distributed active measurement at the same time. The measurement returned 32 893 effective datas totally.After analyzing these datas,gave the Chinese Internet router-level hop count distribution and calculated the un-weighted average hop count was 14.938 89 and the weighted average hop count was 15.613 73.
MEASUREMENT OF THE DETECTION IMPEDANCE AND A DESIGN FOR INCREASING THE SENSITIVITY OF THE DETECTOR IN THE ACOUSTIC IMPEDANCE METHOD
声阻法中检测阻抗的测量和提高检测器灵敏度的设计

LI MING-XIAN,
李明轩

物理学报 , 1974,
Abstract: A simple method is devised for measuring the detection impedance in the acoustic impedance method of detection of unbonds and is based on an equivalent circuit of the detector. On the basis of the measured detection impedance, theoretical exploration is directed toward increasing the detection sensitivity for an unbond by properly choosing some of the detector parameters. The theoretical analysis is found to agree fairly well with the experimental results. In the case of unbond detection the sensitivity is increased by 5 times or more.
Local Mass Transfer Behaviour in a Three-phase Airlift Loop Reactor with Forced Circulation of Slurry Phase
三相强制浆料环流反应器的局部传质行为

LIU Meng-xi,LU Chun-xi,SHI Ming-xian [State Key Laboratory of Heavy Oil Processing,Chinese University of Petroleum,Beijing,China],
刘梦溪
,卢春喜,时铭显

过程工程学报 , 2008,
Abstract: 提出了一种新型的强制外循环三相环流反应器结构,根据结构特点及流动状态的不同,将反应器分为6个不同的流动区域.在φ300 mm×1700 mm的实验装置内,采用氧气气提-空气解吸法,详细考察了内环表观气速0.006-0.19m/s、外循环液速0.03,0.05 m/s、固含率5%,10%,15%时不同流动区域的体积传质系数.发现外循环液流影响区体积传质系数最大,最高可达0.754 s-1,外环环隙区最小,不超过0.043 s-1,,环流反应器整体体积传质系数与气液分离区体积传质系数接近.适当扩大内、外环截面积比有利于提高环流反应器的传质性能.环流反应器整体体积传质系数随内环表观气速和外循环液速的增加而增加,随颗粒浓度的增加略有降低.
A New Method for the Measurement of Solids Time-averaged Velocity in Gas-Solid Two-phase Flow
气固两相流中颗粒时均速度的测量新方法

E Cheng-lin,LU Chun-xi,GAO Jin-sen,XU Chun-ming,SHI Ming-xian,
鄂承林
,卢春喜,高金森,徐春明,时铭显

过程工程学报 , 2003,
Abstract: A new method for calculating time-averaged particle velocity was presented based on the cross- correlation technique. Compared with the other two calculating methods presented by Aguillon and Nieuwland, the new method considers not only the differences between the upward and downward particle element velocities and numbers, but also the differences of particle element concentrations. The measurement of particle time-averaged velocity was completed by using a PV4A optical fiber probe in a cold model set-up of circulating fluidized bed for the sake of ascertaining the differences between the new one and the others. The results show that the differences between them were negligible under higher superficial gas velocity and lower cross-sectional average particle concentration, while the differences were remarkable under lower superficial gas velocity and higher cross-sectional average particle concentration.
Axial Distributions of Solids Density in Annular Flow Mixing Unit of Combustor for Petroleum Coke
石油焦燃烧器环流混合段内床层的轴向密度分布

YAN Chao-yu,LU Chun-xi,WANG De-wu,GAO Jin-sen,SHI Ming-xian,
严超宇
,卢春喜,王德武,高金森,时铭显

过程工程学报 , 2007,
Abstract: A large-scale cold experimental equipment which can adapt to combustion demands of petroleum coke was established by using the combined structure of gas-solid annular flow and riser transporter reactor. The pressure gradients of air-sand two-phase flow along the axial direction of the annular flow unit were measured by differential pressure transmitters under different operation conditions. The axial distributions of solids density in two regions of the annular flow mixing unit, namely internal annular and external annular regions, were investigated. The results show that the axial distributions of solids density in the internal annular region have two modes, namely the bottom dense phase and the upper turbulent flow diffusion phase. The solids flux has little effect on the density distributions in the bottom dense region, but significant effect on the upper turbulent flow diffusion region. The solids density in the whole internal annular region decreases with increasing the superficial gas velocity. The axial distribution of solids density in the external annular region is directly relative to the superficial gas velocity, solids flux in the internal annular region and the solids dense phase level in the external annular region. The empirical models for axial distributions of solids density in the internal and external annular regions have been established based on the experimental data. The model predictions are in good agreement with the experimental data.
Experimental Study on the Solid Hold-up in the Fluidized Bed of a Riser-Fluidized Bed Combined Reactor
液固提升管-流化床组合反应器中流化床径向固含率分布的实验研究

NIE Xiang-feng,LU Chun-xi,MA An,LONG Wen-yu,SHI Ming-xian,
聂向锋
,卢春喜,马安,龙文宇,时铭显

过程工程学报 , 2007,
Abstract: The radial distributions of solid hold-up arc investigated in a cold model of a new type of liquid-solid fluidized bed reactor with 500 mm ID and 4000 mm in height of a riser-fluidized bed combined reactor. The influences of superficial liquid velocity and solids circulating rate on the radial hold-up distribution are also analyzed respectively, focusing on the most probably influential factors. The experimental results show that the whole bed can be divided into three distinct axial zones, distributor influencing zone, gradually developed zone and steadily fluidized zone. At the same time, in these three zones, the cross-sections of the liquid-solid fluidized bed can be characterized by two areas in radial direction, the central and annual areas. Moreover, the three-zone flow features of the liquid-solid fluidized bed and the spouted bed are also compared in detail.
On the scalar nonet in the extended Nambu Jona-Lasinio model
Su, Ming-Xian;Xiao, L. Y.;Zheng, H. Q.
High Energy Physics - Phenomenology , 2007, DOI: 10.1016/j.nuclphysa.2007.06.004
Abstract: We discuss the lightest scalar resonances, $f_0(600)$, $\kappa(800)$, $a_0(980)$ and $f_0(980)$ in the extended Nambu Jona-Lasinio model. We find that the model parameters can be tuned, but unnaturally, to accommodate for those scalars except the $f_0(980)$. We also discuss problems encountered in the K Matrix unitarization approximation by using $N_c$ counting technique.
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