凝汽器管泄漏在线检测系统的开发

在分析各种凝汽器管泄漏检测方法的基础上，针对凝汽器泄漏的检测现状提出了基于示踪气体的凝汽器管泄漏在线检测系统。该系统把六氟化硫气体作为示踪气体，用两相流的方法喷射到凝汽器管中，如有泄漏则将进入真空室，在尾气中收集示踪气体并由此判断是否存在泄漏及确定泄漏的区域。检测系统主要包括气体处理和喷射系统、漏孔定量和定位系统及自动控制系统等。电厂的应用证明系统能够达到理想的效果。     

Studies on condenser-objective lenses

Scaling down the dimensions of a conventional magnetic objective lens to reduce aberrations is studied in detail. The values of other aberration coefficients for optimum lens size corresponding to desired minimum aberration are estimated. The possibility of using iron-free condenser–objective lenses at high voltage is examined.     

冰箱用铜铝管接头的储能焊

本文介绍了冰箱铜铝管接头的性能要求,简述了 PW—1焊机的工艺过程和特点,主要焊接参数的控制方法和效果,列举了由该焊机所焊铜铝管接头的各项性能,并结合对接头的进一步分析及在生产线上的实际应用,提出 PW—1焊机的应用前景.     

交流弧焊机并联电容补偿节电及其计算

交流弧焊机，在我国应用十分广泛，本文分析该设备的工作特点和各种场合下的使用情况，认为采用分散或集中并联电容补偿有利于节电和减小设备容量。并最后提供了计算方法。     

300MW核电汽轮机凝汽器动态过程的数值分析

凝汽器冷却管热应力直接影响到冷却管与管板之间连接的密封性，从而影响到蒸汽发生器的安全运行。通过对300MW核电汽轮机凝汽器动态过程数值仿真，分析了汽轮机真空系统严密性试验，冷却水中断以及汽轮机甩全负荷对凝汽器冷却管热应力的影响，为提高蒸汽发生器运行的安全性。奠定了理论基础。     

Experimental and numerical research on condenser performance for R-22 and R-407C refrigerants

An experimental study of a fin and tube condenser was performed using two different configurations of condenser paths (U and Z type) and two kinds of refrigerants (R-22 and R-407C) as working fluids. An integral test facility was constructed to evaluate the heat transfer capacity of the air and refrigerant sides of the condenser. An uncertainty study was also performed. A numerical code was developed, using a section-by-section analysis scheme in which mal-distribution on the air side and temperature gliding on the refrigerant side could be considered along the tube-length direction. Different condenser capacities were obtained from both the experimental and numerical results, depending on the paths and refrigerants used. R-22 performed better than R-407C for the Z-type path configuration, but no significant difference was found between results using either refrigerant in the U-type path configuration. On average, the numerical results obtained with R-22 were 10.1% greater than experiment data; using R-407C, results were 10.7% less than experiment data. The numerical code can be used as a design tool to develop better condenser paths.     

水冷式冷水机组冷凝器污垢热阻的动态试验研究

本文提出了污垢热阻研究的动态试验方法 ,以珠江水 (猎德段 )作为冷却水并通过一系列试验得出了不同流速下的污垢热阻试验数据 ,并观察到了污垢老化现象。这些数据比HTRI/TEMA推荐的数值要精确 ,并可为冷水机组冷凝器的设计、监控和清洗提供参考     

热回流式冷凝器的设计

热回流式冷凝器可以形成接近于冷凝气体沸点温度的热回流，采用气液两相分路结构，讨论了此种冷凝器换热面积及液泛极限速度的计算。     

Effects of filling ratio and condenser temperature on the thermal performance of a neon cryogenic oscillating heat pipe

A cryogenic oscillating heat pipe (OHP) made of a bended copper capillary tube is manufactured. The lengths of the condenser section, adiabatic section and evaporator section are 100, 280 and 100 mm, respectively. Neon is used as the working fluid. Effects of liquid filling ratio and condenser temperature on the thermal performance of the OHP are studied. A correlation based on the available experimental data sets is proposed to predict the thermal performance of the neon cryogenic OHP with different filling ratios and condenser temperature. Compared with the experimental data, the average standard deviation of the correlation is about 15.0%, and approximately 92.4% of deviations are within ±30%.     

潍坊发电厂2号机低压缸排汽通道优化改造

潍坊发电厂#2汽轮机低压缸的排汽在凝汽器内分布不合理,造成凝汽器换热管热负荷不均匀。通过对2号汽轮机低压缸排汽通道进行优化改造试验,发挥了凝汽器铜管的热交换潜力,提高了凝汽器真空度。