PCCP限制接头止推与钢管止推设计的对比分析

介绍了埋地钢管止推计算及PCCP管道限制接头的止推计算,通过对计算数据的对比分析,反映了不同方法计算结果之间的差异,并对这种差异及其产生的原因进行了分析。     

Special features of corrosion-mechanical damage in welded joints in the main heating system of Moscow

Results of investigation of metallographic special features of corrosion damage in longitudinal welded joints of a main heating system with diameters of 1400 mm and wall thicknesses of 40 mm are presented. It is shown that the nucleation of corrosion pits takes place along the fusion line on the internal wall of the heating system in the areas with high hardness (188–223 HV₁₀) and the presence of a large amount of bainite and Widmanstatten ferrite in the structure.     

基于Pro/E二次开发的注射机双曲肘合模机构的参数化设计

利用机构学的方法对双曲肘合模机构进行了运动分析,并确立了合模行程、各肘杆尺寸及最大启模角等参数间的关联关系。通过使用Pro/E二次开发技术,讨论了应用Pro/toolkit进行菜单开发及零件参数化实现的方法;以MFC对话框设计技术和VC++建立了双曲肘合模机构参数驱动自动生成技术,开发出了与Pro/E 4.0系统集成的合模机构零件参数化设计系统。     

亭子口水利枢纽电站尾水肘管制造质量控制

尾水肘管制造是一个综合性的制造工程,在技术准备充分的前提下,加强生产过程中各工序的质量控制是保证整个尾水肘管产品质量的关键.亭子口水利枢纽工程电站尾水肘管制造着重从钢板进厂、下料、卷板、组装、焊接及防腐等几个方面进行质量控制.目前,已基本制造完成,质量满足工程要求,质量控制效果较好.     

大管径直埋供热管道穿越河流关键设计内容

结合工程实例，对DN1000mm直埋热水供热管道穿越河流关键设计内容进行了探讨，涉及安装方式的选取、施工方案、工作钢管壁厚计算、抗浮验算、直埋弯头强度验算等。     

Development of the bus joint for the ITER Central Solenoid

The terminations of the Central Solenoid (CS) modules are connected to the bus extensions by joints located outside the CS in the gap between the CS and torodial field (TF) assemblies. These joints have very strict space limitations. Low resistance is a common requirement for all ITER joints. In addition, the CS bus joints will experience and must be designed to withstand significant variation in the magnetic field of several tenths of a Tesla per second during initiation of plasma. The joint resistance is specified to be less than 4 nΩ.The joints also have to be soldered in the field and designed with the possibility to be installed and dismantled in order to allow cold testing in the cold test facility. We have developed coaxial joints that meet these requirements and have demonstrated the feasibility to fabricate and assemble them in the vertical configuration. We introduced a coupling cylinder with superconducting strands soldered to the surface of the cable that can be installed in the ITER assembly hall and at the cold test facility. This cylinder serves as a transition area between the CS module and the bus extension.We made two racetrack samples and tested four bus joints in our Joint Test Apparatus. Resistance of the bus joints was measured by a decay method and by a microvoltmeter; the value of the current was measured by the Hall probes. This measurement method was verified in the previous tests. The resistance of the joints varied insignificantly from 1.5 to 2 nΩ.One of the challenges associated with a soldered joint is the inability to use corrosive chemicals that are difficult to clean. This paper describes our development work on cable preparation, chrome removal, compaction, soldering, and final assembly and presents the test results.     

泵站管路节能设计与施工

本文为了提高泵站的装置效率，降低能源单耗，从提高管路效率入手，选用内壁粗糙度低、且又不锈蚀的钢筋混凝土压力管。依据泵流量求出管道的经济管径，并配以自行设计，监制的“偏心渐变弯头”，从而较好地解决了混凝土管和泵的进出水口平顺衔接问题；同时在进水口采用“肘式进水流道”，尽量减少管路中的水头损失，使管路效率比原来有大幅度的提高，使能源单耗大大降低。     

硬质阻燃塑料电工管的施工控制

施工中常常多专业交叉施工．如果塑料电工管预埋施工控制措施不当或管路保护不到位．会给后序施工带来隐患。从加强材料进场检验入手，合理安排工序，采取卧槽法和曲线法施工，可大大提高塑料电工管的施工质量。     

The effect of elevated inlet air temperature and relative humidity on cogeneration system

The effect of elevated inlet air temperature and relative humidity on a gas turbine (GT) cogeneration system performance was investigated. The analysis was carried out on a GT of a capacity 171 MW at ISO condition, which is integrated with a dual pressure heat recovery steam generator (HRSG), the cogeneration system had been tested under Kuwait summer climate conditions. A computational model was developed and solved using engineering equation solver professional package to investigate the performance of a dual pressure GT‐HRSG system. The suggested HRSG is capable of producing high‐pressure superheated steam at 150 bar and 510°C to operate a power generation steam turbine cycle, and a medium pressure saturated steam at 15 bar to run a thermal vapor compression (TVC) desalination system. In this research, the influence of elevated inlet air temperature and relative humidity on the energy assessment of the suggested cogeneration system was thoroughly investigated. Results indicated that operating GT under elevated values of inlet air temperatures is characterized by low values of net power and thermal efficiency. At elevated inlet air temperatures, increasing relative humidity has a small positive impact on GT cycle net power and thermal efficiency. Integrating the GT with HRSG to generate steam for power generation and process heat tends to increase energy utilization factor of the system at elevated inlet air temperatures. Increasing inlet air temperature plays a negative impact on power to heat ratio (PHR), while relative humidity has no effect on PHR. Copyright © 2009 John Wiley & Sons, Ltd.     

长江埠供水系统存在问题分析及其对策

针对长江埠供水系统所存在的地下源水腐蚀性较强、局部管网流向设置不合理和局部建筑内给水管道严重老化等问题，提出了一整套系统改造措施。