中空纤维膜氢回收系统在制氢装置的应用

简述了中空纤维膜分离原理、开车步骤，分析了中空纤维膜氢回收系统标定数据，指出存在的问题，并进一步对比分析了加氢干气直接作为制氢原料和用中空纤维膜氢回收系统的非渗透气作为制氢原料的优缺点．     

A new methodology to solve non‐linear equation systems using genetic algorithms. Application to combined cyclegas turbine simulation

This paper shows a methodology to sort out the equations of a non‐linear system in order to solve it by the fixed‐point method. The arrangement of the equations is established by a genetic algorithm that deals with a population of possible resolution processes of the system. The method is specially useful in the following situations: first, when the system is very non‐linear and has many variables (where the Newton–Raphson method does not work properly); second, when the number of equations and variables may be altered because the equation system may change in each simulation and, therefore, more than one only solution process is needed if the fixed‐point process is employed. As an example, the methodology has been applied to solve the equation system that models the behaviour of a heat recovery steam generator of a combined cycle power plant at full load and part load conditions. Copyright © 2005 John Wiley & Sons, Ltd.     

Liquid helium cryostat for SQUID-based MRI receivers

We describe a liquid helium cryostat, developed to cool SQUID-based receivers in low field MRI systems. The cryostat has a 4 L liquid helium capacity, a hold time of over 3 days and accommodates 10 cm diameter receiver coils. New vacuum insulation methods reduce the noise level by at least an order of magnitude compared to existing commercial designs. The minimum detectable field at 425 kHz, with a 5 cm diameter circular coil, was estimated to be 0.018 fT/Hz^1/2 from Q-factor measurements and 0.035 fT/Hz^1/2 by direct measurement with a SQUID amplifier. Further measurements indicated that most of this field noise probably originates with dielectric losses in the cryostat’s fibreglass shells.     

Heat transfer coefficient measurements for mixed gas working fluids at cryogenic temperatures

The use of mixed gas working fluids has become common in Joule-Thomson type cryocoolers for a variety of applications. However, there is very little data or theory currently available regarding the heat transfer coefficient associated with these multi-component, multi-phase mixtures at cryogenic temperatures. This paper describes an experimental test facility and procedure that has been used to make careful measurements of the horizontal, flow boiling heat transfer coefficient for several hydrocarbon mixtures that are nominally optimal for small, Joule-Thomson cryocoolers in the 80 K to 120 K operating range. Data are presented over a range of temperatures from 100 K to room temperature and for several pressures and mass flow rates. The results indicate that quality and mass flux are the most important parameters governing the heat transfer coefficient among those that were varied. The experiment is verified by carrying out tests using single-phase, pure nitrogen gas and comparing the results with the Dittus-Boelter equation. The experimental uncertainty of the measurements is estimated from 1st principles; additionally, the repeatability of the experimental measurements was investigated by replicating tests at a nominal set of operating conditions and composition on separate days. The measurements presented here are intended to aid in the design of small, mixed-gas Joule-Thomson cryocoolers.     

气体传感器在感度测试自动鉴爆中的应用

针对感度测试自动鉴爆的要求,选用合适的气体传感器,组建测试系统,实时采集感度试验时特定气体的生成量,进行预处理和特征量提取,再利用BP算法在线进行计算,根据鉴别准则进行鉴别。试验证明:提出的方法能实现爆炸鉴别的自动化,操作简单、识别率高。     

汽车尾气在路检测技术

随着社会经济的快速发展，我国的汽车的数量也逐年快速上升，汽车排出的尾气已经成为一个重要的污染源。因此，快速方便地检测汽车尾气，已成为一个重要的课题。本文介绍了一种用可调谐激光器的差分吸收法的探测汽车尾气方法，可以在路边检测行进中的汽车的尾气是否超标。     

转子摆动多相泵的研制及应用

转子摆动多相泵为容积式泵，转子与定子在工作时互不接触，保持一定的间隙，泵采用专门的润滑系统，润滑轴承及机械密封。该类泵具有效率高，自吸能力强，无故障运转周期长，无泄露，噪音低，现场管理方便等特点。主要用于油田的油、气、水等多相混输，可有效降低井口压力，提高油井产量，减少投资成本。     

光纤瓦斯气体传感器的发展

用于检测瓦斯气体浓度的光纤瓦斯气体传感器在采矿、化工、石油等工业中，尤其在恶劣和危险的环境中，具有广阔的应用前景：本文综述了光纤瓦斯气体传感器的近期发展。     

低压省煤器在电站锅炉中的应用

针对排烟损失大的问题，某些电厂在电除尘器出口加装低压省煤器，用来加热凝结水或热网补水，从而吸收烟气热量，实际测试结果表明，对于节能降耗和保证安全运行均起到了重要作用。     

直生式天然气在可控气氛周期炉中的应用

介绍了钢件在化学热处理过程中，采用周期式多用炉，将天然气和空气直接通入炉内，生成可控气氛进行渗碳方面的试验研究。主要对可控气氛成分的分析，碳势控制仪器选择以及针对天然气和空气在周期炉中的比例等问题进行了大量试验研究。结果表明：利用氧探头控制系统，直生式天然气可控气氛热处理是可行的，而且与甲醇加丙酮作渗碳剂相比较，渗碳效果好，速度快，经济效益可观。