Study of ITER equatorial port plug handling system and vacuum sealing interface

In the field of the ITER port plug engineering and integration task, CEA has contributed to define proposals concerning the port plugs vacuum sealing interface with the vessel flange and the equatorial plug handling.The 2001 baseline vacuum flange sealing consisted of TIG welding of a 316L strip plate on to U shapes. This arrangement presented some issues like welding access, implementation of tools, lip consumption, complex local leak test, continuous leak checking. Therefore, an alternate sealing solution based on the use of metallic gaskets is proposed. The different technical aspects are discussed to explain how this design can simplify the maintenance and deal with safety and vacuum requirements.The design of the mechanical attachment and vacuum sealing of the plug has constantly evolved, but the associated remote handling equipment was not systematically reviewed. An update of the cask and maintenance procedure was studied in order to design it in accordance with the last generic plug flange design. This includes a concept of a gripping system that uses the plug flange bolting area and, to help the remote handling process, a cantilever assisting system is suggested to increase the reliability of the transfer operation between vacuum vessel and cask.     

Biochip with integrated pumps for plug-based sequential exchange of solutions

A novel method for exchanging solutions used in biochemical analyses and a device to carry out the exchange are proposed. An array of plugs formed using six injectors was transported in a microflow channel using a main pump located at one end of the main flow channel. The injectors and main pump were operated on the basis of the change in volume caused by the electrolysis of water. Bubbles were produced from working electrodes; these bubbles caused a diaphragm placed below the injectors to inflate and occlude the inlet of the solution reservoir. Increase in the number of bubbles caused the reservoir to inject the solution into the main flow channel in the form of a plug. Each plug was individually transported downstream to the sensing area by the main pump, which was operated in a similar manner to the injector. The device was used for the detection of a tumor marker, α-fetoprotein (AFP). Plugs of necessary solutions were individually transported to the sensing area with immobilized primary antibodies to allow antigen–antibody binding, cleaning, and detection. The fluorescence intensity from the antibodies showed clear dependence on the concentration of AFP. The immobilization of antibodies could also be carried out on-chip.     

A study on port plug distortion caused by narrow gap combined GTAW & SMAW and Electron Beam Welding

A study of port plug distortion resulting from narrow gap combined GTAW & SMAW and Electron Beam Welding was carried out. Thermomechanical finite element analysis of port plug becomes virtually impossible because of the requirement of huge number of nodes and elements. Hence an analysis method based on the concept of inherent strain was used in this work. The computational time required was about 40-50 min only in a Core (TM) 2 Duo, 2.66 GHz computer with 2 GB RAM, which otherwise was not possible with other conventional computation techniques. As was expected the overall distortion due to EB welding was found to be less compared to that of narrow gap GTAW & SMAW.     

连续管磨钻工艺的研究与应用

钻铣桥塞是解决水平井分段压裂后续问题的关键技术。常规钻铣工艺通过普通油管加钻铣工具来实现,但存在工具下入困难、施工周期长等问题。为此,开发了连续管磨钻工艺技术。该技术通过水力液压动力带动磨鞋高速旋转,对井内堵塞物进行钻磨,磨铣成细小碎屑返出,使井筒畅通,以方便进一步的返排和生产作业。2口井的现场应用结果表明,连续管连接钻铣工具易下入水平井段,可实现边钻铣边冲砂连续施工,具有带压作业、施工周期短及效率高等优势。     

高压盘式不停输封堵技术在宁波北仑地区的应用

结合工程实际，论述了高压燃气管道不停输封堵施工的盘式封堵施工工艺、介绍了盘式封堵作业中的风险控制及注意事项。此外，从设计角度提出对工艺改进的建议。     

水力冲击法解堵的研究及应用

在简单分析大庆油田推广应用的几种物理法采油技术的基础上,提出了水力冲击解堵技术。该技术是依据流体运动中的水击现象作用原理进行工作的。介绍了水力冲击发生器的结构组成及工艺管柱结构、工作原理和工艺流程;对水力冲击发生器产生的冲击压力进行了分析,并给出了估算冲击压力的理论计算公式,计算表明,水力冲击器能产生20~40MPa的冲击压力;评价了该冲击压力对套管和油管不会造成损害。还给出了该技术的现场试验结果,最后得出几点有益的结论。     

摩托车及汽油机用火花塞原理、结构、特性及实用技术

本文比较系统地介绍了摩托车及汽油机用火花塞的工作原理，结构，特 性及实用技术，供参考。     

Solution Method for Countercurrent Plug Flow Models of Multicomponent Gas Separation by Permeation

Abstract

A simple solution method was developed for the countercurrent ideal plug flow model of multicomponent gas separation by permeation that is commonly applied to hollow fiber membrane modules. The solution method is independent of the number of components in the feed gas. The result is an implicit function in a single variable defined as the stage cut. The function is readily solved by the method of damped successive substitution. The method was tested for three cases from the literature and found to be insensitive to the initial guess for stage cuts less than 60%.     

钻孔压水试验水压式栓塞排水泄压问题研究

压水试验水压式栓塞较其他类型栓塞可靠、灵活,但一直存在试验结束后排水泄压难题,使该类型栓塞使用局限于浅孔及地下水位高的钻孔。本文对该问题进行了研究,提出了解决方案,设计了新型水压式栓塞结构。解决了一直以来水压式栓塞的排水泄压难题,突破了试验孔深限制,使水压式栓塞能得到广泛应用。介绍了该新型水压式栓塞的结构和工作原理以及工程应用效果。     

RIP法吸附设备级间空气提升器的效率和防堵研究

对RIP法吸附设备级间空气提升器的效率和防堵进行了研究。结果表明,空气提升器的提升速度与空气消耗量、沉没系数、提升器截面积(提升器结构)有关;提升器的效率是总提升速度、沉没系数、提升器截面积的函数。为保证吸附剂的最大提升速度,应使提升器工作于最佳状态。通过专门的结构设计或相应的工作制度,进气嘴和提升管堵塞可以得到很好解决。