基于单片机AT89C52的漏磁检测实验系统开发

本文介绍了基于单片机技术的漏磁检测系统。首先介绍了漏磁检测的原理,然后结合电子电路技术,单片机技术,开发了一套漏磁检测实验系统。该系统包括信号的采集,预处理,模/数转换,数据结果存储,数据串口发送。单片机的软件系统采用模块化设计,分为数据采集、数据存储、数据串口发送模块等。     

换热器列管与管板焊接应力腐蚀裂纹的防治

对换热器列管与管板焊缝泄漏原因进行分析,提出控制产生腐蚀泄漏的相应措施,及检修过程中泄漏处理的方法。     

Experiments on the thermal stratification in the branch of NPP

The thermal stratification phenomena, frequently occurring in the component of nuclear power plant system such as pressurizer surge line, steam generator inlet nozzle, safety injection system (SIS), and chemical and volume control system (CVCS), can cause through-wall cracks, thermal fatigue, unexpected piping displacement and dislocation, and pipe support damage. The phenomenon is one of the unaccounted load in the design stage. However, the load have been found to be serious as nuclear power plant operation experience accumulates. In particular, the thermal stratification by the turbulent penetration or valve leak in the SIS and SCS pipe line can lead these safety systems to failure by the thermal fatigue. Therefore in this study an l/lO scaledowned experimental rig had been designed and installed. And a series of experimental works had been executed to measure the temperature distribution (thermal stratification) in these systems by the turbulent penetration, valve leak, and heat transfer through valve. The results provide very valuable informations such as turbulent penetration depth, the possibility of thermal stratification by the heat transfer through valve, etc. Also the results are expected to be useful to understand the thermal stratification in these systems, establish the thermal stratification criteria and validate the calculation results by CFD Codes such as Fluent, Phenix, CFX.     

Dielectric properties of Fe-doped Ba0.65Sr0.35TiO3 thin films fabricated by the sol–gel method

Fe-doped Ba_0.65Sr_0.35TiO₃ (BST) thin films have been fabricated on Pt/Ti/SiO₂/Si substrate using the sol–gel method. The structural and surface morphology, dielectric, and leakage current properties of undoped and 1 mol% and 2 mol% Fe-doped BST thin films have been studied in detail. The results demonstrate that the Fe-doped BST films exhibit improved dielectric loss, tunability, and leakage current characteristics as compared to the undoped BST thin films. The improved figure of merit (FOM) of Fe-doped BST thin film suggests a strong potential for utilization in microwave tunable devices.     

有毒介质泄漏扩散模型在尿素装置安全评价中的应用

总结归纳了有毒介质泄漏扩散过程特点及泄露量计算的模型。以乌鲁木齐石化尿素生产装置为例进行有毒介质泄露扩散分析,在此基础上运用计算机模拟软件,模拟有毒介质扩散的过程,给出了定量化的评价结果。依据此例,将有毒介质泄露扩散模型引入安全评价的体系中,丰富了安全评价的体系内容,增加了安全评价定量化评价的方式。     

釜用完全剖分式机械密封改进设计研究

根据釜用完全剖分式机械密封的市场需求,对目前产品存在的缺陷进行分析研究,并给出解决方案。     

含泄漏层的井下水力增压器增压特性研究

为了进一步提高水力喷砂射孔技术的射流压力,摆脱传统的地面增压方式因压力传输困难、能耗高等原因对深层地层岩石压裂难的困境,基于实际射孔工艺要求,设计了井下水力增压器。根据井下水力增压器的结构和工作原理,考虑活塞与活塞筒之间的泄漏层对增压效果的影响,建立了增压缸流体域模型,利用动网格技术对增压缸的增压特性进行数值模拟研究。研究结果表明:增压过程中,增压腔压力和流体出射速度均随时间先增大后逐渐呈现出高频周期性波动的规律;增压腔压力和流体出射速度随输入压力和低压腔与增压腔流体的有效作用面积比的增大而增大,且增压腔压力近似等于输入压力和有效作用面积比的乘积;泄漏层厚度对增压腔压力和流体出射速度的波动性影响很大。该研究结果为后期增压器结构设计和参数优选提供了参考。     

Development of novel two-interconnected fluidized bed system

Two-interconnected fluidized bed systems are widely used in various processes such as Fisher-Tropsch, hot gas desulfurization, CO₂ capture-regeneration with dry sorbent, chemical-looping combustion, sorption-enhanced steam methane reforming, chemical-looping hydrogen generation system, and so on. However, conventional two-interconnected fluidized bed systems are very complex, large, and difficult to operate because most of these systems require a riser and/or pneumatic transport line for solid conveying and loopseals or seal-pots for gas sealing, recirculation of solids to the riser, and maintaining of pressure balance. To solve these problems, a novel two-interconnected fluidized bed system has been developed. This system has two bubbling beds, solid injection nozzles, solid conveying lines, and downcomers. In this study, the effects of operating variables on solid circulation rate and gas leakage between two beds have been investigated in a cold mode two-interconnected fluidized bed system. The solid circulation rate increased as the hole diameter on the injection nozzle, the diameter of the injection nozzle, the solid height above the holes, and the number of holes on the injection nozzle increased. The gas leakage between the beds was negligible. Moreover, long-term operation of continuous solid circulation up to 60 hours was performed to check the feasibility of stable operation. The pressure drop profiles in the system loop were maintained steadily and solid circulation was smooth and stable.     

气缸内迷宫密封流场特性研究

建立了迷宫式活塞压缩机的迷宫密封数学模型,运用FLUENT软件对其气缸迷宫内的气体流动进行了计算模拟,并对迷宫压缩机活塞与气缸壁间的迷宫流场进行了分析。     

气体泄漏检测方法及其工程应用

简要介绍了气动技术中常见的气体泄漏检测方法。其中详细介绍了绝对压力检测法的理论基础。可供工程应用参考。