分析仪器在空分系统中的配置及维护

青岛钢铁集团公司氧气厂于2002年买进一套10000m^3/h空分系统,2004年新购一套15000 m^3/h空分系统.这两套机组都由开封空分集团有限公司成套,采用分子筛、上塔规整填料,全精馏无氢制氩流程,分别于2002年8月,2004年8月一次投运成功,目前设备运行正常.产品氧气、氮气、氩气、液氧、液氩的质量均符合国家标准,产量达到了设计要求.     

鄂钢万立方米高纯氧分析仪器选型与应用

结合10000 m^3/h空分设备高纯氧的生产过程,撰述了在高纯氧产品生产过程和产品质量控制中分析仪器的选型及使用这些分析仪器的一些体会.     

北京南龙有限公司产品说明

本公司生产的空分制氮机(见封底广告)应用世界先进的技术及工艺流程,采用德国B、F分子筛及进口阀门(SMC)等关键部件。产品产氮率高,寿命长,只需常压解析,性能稳定。 本设备为二塔吸附结构,采用压力吸附,常压解吸流程,无需真空解吸,一塔吸附产氮,另一塔解吸再生,两塔交替工作,即可不断生产所需氮气。用户可根据需要选择合适的产气量和氮气纯度。设备装有先进的PC机控制程序,开机后全部自动操作。 可为用户提供:普氮型(P.S.N装置,纯度99.5％); 高纯氮型(P.S.N装置+纯化装置,纯度99.9995％)。     

北京南龙有限公司产品说明

本公司生产的空分制氮机(见封面广告)应用世界先进的技术及工艺流程,采用德国B、F分子筛及进口阀门(SMC)等关键部件。产品产氮率高,寿命长,只需常压解析,性能稳定。 本设备为二塔吸附结构,采用压力吸附,常压解吸流程,无需真空解吸,一塔吸附产氮,另一塔解吸再生,两塔交替工作,即可不断生产所需氮气。用户可根据需要选择合适的产气量和氮气纯度。设备装有先进的PC机控制程序,开机后全部自动操作。 可为用户提供:普氮型(P.S.N装置,纯度99.5％); 高纯氮型(P.S.N装置+纯化装置,纯度99.9995％)。     

《计测技术》2005年第25卷总目次

综合评述光纤功率量值溯源方法研究……………………高业胜(1-1)谐振式微机械惯性传感器…樊尚春肖志敏张庆荣(2-1)航空电子综合测试系统的发展现状及趋势……………………………………………………………史彦斌段哲民(4-1)光敏元件与光传感器的市场动态和发展…………………………………………………………………李策邹文江(4-3)关于空分设备安全监测的历史及发展…………张丙新(5-1)氧分析仪在微量氧分析中的应用…………汪峻姚斐(5-3)工业气体分析中的气相色谱分析技术进展…………………………………………………梁汉昌孙传忠李先波(5-6…     

机载制氮系统中空纤维膜分离特性

采用微元方法建立了机载制氮系统中空纤维膜数学模型,并使用龙格-库塔法对其进行了数值计算,与实验数据进行对比后显示,误差不超过10%.然后分析了单位膜面积进料量、膜丝(membrane fiber)内外压比和氧氮渗透比其对产品气氧体积分数和制氮效率的影响.结果表明:增加单位膜面积进料量虽然可提高制氮效率的增加,但是会显著降低产品气中氮的体积分数,因此需要采用合适的流程设计以克服此缺点.压比和氧气渗透系数的增加均会使氧体积分数与制氮效率减小,但是提高渗透比对制氮效率影响不大,因此对于气体分离过程是有利的.通过计算模型及实验数据,分析了中空纤维膜分离理想度随压比和温度的变化关系,结果显示压力对理想度影响较大,随着压力增加,实际分离过程与理论值偏差趋大,而温度对理想度影响较小.      

关于GM592型气相色谱仪的使用及气路调节

我厂用于空分高纯氮气生产检测的GM592型气相色谱仪是2002年引进的,由于使用时间长气路阻力变化,造成色谱峰保留时间不正常,甚至不出峰,严重影响空分产品质量监控.经过对气路流速的微量调节,现已解决存在的问题.     

进口气体分析仪在空分厂的应用

简要介绍了ULTRAMAT6E二氧化碳分析仪、OXYMAT61氧分析仪、K-3000氧中氩色谱分析仪等进口气体分析仪器及使用、维护的方法.     

基于ARINC-618协议的地空数据链技术研究

地空数据链作为大型民机的标准配置,在我国自主研制大型民用客机的过程中需要深入、全面地了解和掌握。鉴于当前地空数据链设备仅有国外个别厂商提供,国内相关领域的技术积累较少,针对地空数据链的基本问题,开展了以ARINC-618协议为核心的地空数据链的传输信号和译码等基础研究,并以过境飞机的ACARS信号为基础进行了技术分析。     

高温气体LTE模型参数计算方法及其在非平衡电弧射流状态诊断中的应用研究

运用统计力学的方法建立了高温氮氧氩混合气体LYE模型参数计算方法及标准程序(压力：10Pa～10^7Pa、温度：3000K～30000K)，这在国内是没有的。在此基础上，建立了高温气体LYE模型参数测量方法，对电弧等离子体射流的非平衡性质进行了检验，结果表明：电流80A、压力0．027MPa下，亚音速氩射流中心是LYE的，中心之外非平衡效应显著，偏离LYE、但是PLTE的，LYE温度与电子温度相差最大达3000K；电流70A、压力0．00149MPa下，超音速氩射流非平衡效应非常显著，LTE模型温度与电子温度相差最大达5000多K。     

The effect of inlet conditions on the flow and heat transfer in multiple rotating cavity with axial throughflow

This paper discusses experimental results from two different build configurations of a heated multiple rotating cavity test rig.Measurements of heat transfer from the discs and tangential velocities are presented.The test rig is a 70% full scale version of a high pressure compressor stack of an axial gas turbine engine.Of particular interest are the internal cylindrical cavities formed by adjacent discs and the interaction of these with a central axial throughflow of cooling air.Tests were carried out for a range of non-dimensional parameters representative of high pressure compressor internal air system flows(Re up to 5×106 and Rez up to 2×105).Two different builds have been tested.The most significant difference between these two build configurations is the size of the annular gap between the(non-rotating) drive shaft and the bores of the discs.The heat transfer data were obtained from thermocouple measurements of surface temperature and a conduction solution method.The velocity measurements were made using a two component,LDA system.The heat transfer results from the discs show differences between the two builds.This is attributed to the wider annular gap allowing more of the throughflow to penetrate into the cavity.There are also significant differences between the radial distributions of tangential velocity in the two builds of the test rig.For the narrow annular gap,there is an increase of non-dimensional tangential velocity V/Ωr with radial location to solid body rotation V/Ωr=1.For the wider annular gap,the non-dimensional velocities show a decrease with radial location to solid body rotation.      

Research on Auto-detection for Remainder Particles of Aerospace Relay Based on Wavelet Analysis

Aerospace relay is one kind of electronic components which is used widely in national defense system and aerospace system. The existence of remainder particles induces the reliability declining, which has become a severe problem in the development of aerospace relay. Traditional particle impact noise detection (PIND) method for remainder detection is ineffective for small particles, due to its low precision and involvement of subjective factors. An auto-detection method for PIND output signals is proposed in this paper, which is based on direct wavelet de-noising (DWD), cross-correlation analysis (CCA) and homo-filtering (HF), the method enhances the affectiv-ity of PIND test about the small particles. In the end, some practical PIND output signals are analysed, and the validity of this new method is proved.     

Preparation of Highly Dispersed Antimony-doped Tin Oxide Nano-powder via Ion-exchange Hydrolysis of SnCl4 and SbCl3 and Azeotropic Drying

Antimony-doped tin hydroxide colloid precipitates have been synthesized by hydrolysis of SnCl4 and SbCl3 using: (1) an ion-exchange hydrolysis to remove chlorine ions, and (2) isoamyl acetate as an azeotropic solvent to obviate water. The obtained dried powder is of high dispersivity without any need for further grinding. The size and dispersivity of the final particles are investigated with the aid of TG-DTA, BET, XRD and TEM. After having calcined, the antimony-doped tin oxide nanopowder possesses a tetragonal rutile structure with high dispersivity, uniform particles and low hard agglomeration.     

Effects of Mo on the Microstructure and Hydrogen Sorption Properties of Ti-Mo Getters

The effects of Mo on the microstructure evolution, porosity and hydrogen sorption properties of Ti-Mo getters are investigated in this work. The results show that the addition of Mo prolongs the densification process of Ti-Mo getters and results in a significant amount of sintered pores. With the Mo content increasing, the porosity of getters firstly increases reaching the maximum value as it at- tains about 7.5wt.%, and then drops. At the room temperature, the hydrogen sorption property of getters increases progressively with the Mo content increasing, but the tendency is not very clear before its content lies below 2.5wt.%. When the Mo content achieves about 7.5wt.%, the hydrogen sorption property proves to be the best. The discussion is made about the above mentioned phenomena inclusive of hydrogen sorption properties of getters under different activation conditions (from 500-750 ℃).     

超声速燃烧数值模拟中的湍流与化学反应相互作用模型

高精度数值模拟有助于理解超声速湍流燃烧中湍流与化学反应的相互作用,可为发动机燃烧室等工程应用设计提供可靠的预测模型。除直接数值模拟外,目前在湍流燃烧应用中使用的大涡模拟和雷诺平均Navier-Stokes模拟均需要借助模型模化发生在湍流小尺度上的流动与化学反应过程对湍流大尺度运动的影响。现有的湍流与化学反应相互作用模型大致可分为:火焰面类模型和概率密度函数类模型,2类模型在不同的应用中各自具有优势和局限性。此外,现有模型大都基于低马赫数燃烧,而超声速燃烧中通常会伴随快速混合、局部熄火和再着火以及激波等复杂过程,这为发展其中的湍流与化学反应相互作用模型提出了更多的挑战。     

适于低轨卫星IP网络的单核共享树组播算法(英文)

为了解决低轨卫星IP网络中现有典型源组播算法的信道资源浪费问题,本文提出了一套单核共享树组播算法,即核心群合并共享树(CCST)和加权核心群合并共享树(w-CCST)算法。CCST 算法包括动态近似中心(DAC)选核方法和核心群合并组播路径构建方法。DAC方法专为周期、规律运动的低轨卫星网络提出,不需要复杂的星上计算。在核心群合并方法中,以核节点作为初始核心群,通过核心群和剩余组成员的最短路径方法逐步扩展直至整棵组播树构建完成,从而使得组播树的树代价最小,大大提高了网络的带宽利用率和组播传输效率。w-CCST 算法中所提出的加权因子可以调整树代价和端到端传播时延之间的折衷程度,因此,可以通过调整加权因子来适度增大树代价、降低端到端传播时延以支持某些端到端时延要求苛刻的实时组播业务。最后,与低轨卫星 IP 网络中典型算法进行了性能比较,仿真结果说明,CCST 算法的平均树代价比其它算法显著降低,w-CCST 算法的平均端到端传播时延小于 CCST 算法。     

Jet Vectoring Control Using a Novel Synthetic Jet Actuator

A primary air jet vectoring control system with a novel synthetic jet actuator (SJA) is presented and simulated numerically. The results show that, in comparison with an existing traditional synthetic jet actuator, which is able to perform the duty of either “push” or “pull”, one novel synthetic jet actuator can fulfill both “push” and “pull” functions to vector the primary jet by shifting a slide block inside it. Therefore, because the new actuator possesses greater efficiency, it has potentiality to replace the existing one in various appli- cations, such as thrust vectoring and the reduction of thermal signature. Moreover, as the novel actuator can fulfill those functions that the existing one can not, it may well be expected to popularize it into more flow control systems.     

Nonlinear Adaptive Slewing Motion Control of Spacecraft Truss Driven by Synchronous V-gimbaled CMG Precession

The slewing motion control of a truss arm driven by a V-gimbaled control-moment-gyro (CMG) is a nonlinear control problem. The V-gimbaled CMG consists of a pair of gyros that must precess synchronously. The moment of inertia of the system, the angular momentum of the gyros and the external disturbances are not exactly known. With the help of feedback linearization and recursive Lyapunov design method, an adaptive nonlinear controller is designed to deal with the unknown items. Performance of the proposed controller is verified by simulation.     

An SOR Implicit Time-accurate Scheme in Calculating Unsteady Flows

A new time-accurate marching scheme for unsteady flow calculations is proposed in the present work. This method is the combination of classical Successive Over-Relaxation (SOR) iteration method and Jacobian matrix diagonally dominant splitting method of LUSGS. One advantage of this algorithm is the second-order accuracy because of no factorization error. Another advantage is the low computational cost because the Jacobian matrices and fluxes are only calculated once in each physical time step. And, the SOR algorithm has better convergence property than Gauss-Seidel. To investigate its accuracy and convergency, several unsteady flow computa- tional tests are carried out by using the proposed SOR algorithm. Roe’s FDS scheme is used to discritize the inviscid flux terms. Un- steady computational results of SOR are compared with the experiment results and those of Gauss-Seidel. Results reveal that the numerical results agree well with the experimental data and the second-order accuracy can be obtained as the Gauss-Seidel for unsteady flow computations. The impact of SOR factor is investigated for unsteady computations by using different SOR factors in this algorithm to simulate each computational test. Different numbers of inner iterations are needed to converge to the same criterion for different SOR factors and optimal choice of SOR factor can improve the computational efficiency greatly.