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。     

一种基于模糊规则和遗传算法的凝汽器故障诊断方法的研究

该文总结了汽轮机组凝汽器低真空常见故障，建立了凝汽器典型故障集。介绍了基于信息熵的故障征兆提取方法，建立了凝汽器故障征兆集。在利用模糊规则的故障诊断方法基础上，提出了一种基于模糊规则和遗传算法的凝汽器故障诊断方法。通过遗传算法对用于故障诊断的模糊规则进行精简，消除了低置信度规则的影响，从而提高了故障诊断效率。最后，将该文提出的方法用于某汽轮机组凝汽器故障诊断中，结果表明该方法行之有效，且易于工程实现。     

BFe30-1-1白铜管早期腐蚀失效原因分析

某电厂凝汽器BFe30-1-1白铜管投运后几年内出现较为严重的局部腐蚀和点腐蚀，为此，对材质、水质等诸多因素进行了分析研究，通过宏观、微观检查和电化学试验，认为是微生物及生物粘泥的附着引起了铜管的早期腐蚀失效。     

Experimental study of the gravity effect on the distribution of refrigerant flow in a multi-pass condenser

Gravity in multi-pass condensers affects the refrigerant flow rate distribution, owing to the gravitational pressure drop that occurs mainly in the U-bend tubes in fin and tube condensers with horizontal tubes. This effect was studied using an experimental approach. A condenser with two ‘nU’ circuits was selected, and the temperature variation of the refrigerant side was measured and compared along each circuit. The critical air velocity, which indicated the initiation of the gravity effect, was found for a given refrigerant flow rate. As the air velocity increased beyond the critical air velocity, the gravity effect (or mal-distribution of the refrigerant flow) developed further. Similarly, the critical refrigerant flow rate was also determined for a given air velocity. As the refrigerant flow rate decreased below the critical refrigerant flow rate, the gravity effect also developed further. The gravity-affected region was shown in the table with rows of air velocities and columns of refrigerant flow rates, and expressed using a single parameter for a given refrigerant flow circuit.     

14000m~3/h空分设备粗氩塔冷凝器的修复

介绍了14 0 0 0m3 /h空分设备粗氩塔冷凝器泄漏的故障确认、泄漏期间的工况调整和冷凝器的修复,分析了粗氩塔冷凝器泄漏的原因;最后简述了预防措施和对加氢除氧流程制氩系统操作上的一些建议     

漏空气对凝汽器传热性能影响的实验研究

通过凝汽器传热性能实验，研究了凝汽器热负荷和漏空气量变化时凝汽器压力、传热系数和端差的变化规律，得到了各参数变化对应的临界空气相对含量值。实验结果表明，当空气相对含量小于相应临界值时，凝汽器传热性能受空气相对含量变化的影响较小，即随空气相对含量增加，压力和端差缓慢增加，传热系数略有减小；反之，当空气相对含量大于相应临界值时，凝汽器压力和端差迅速增大，传热系数急剧下降。尽管不同凝汽器热负荷下各性能参数变化对应的临界空气相对含量值各不相同，但变化不大，均在1％左右。这为进一步定量研究漏空气对凝汽器传热性能影响奠定了一定基础。     

7mm铜管翅片换热器使用R410A冷媒的最佳回路长度计算

本文针对采用R410A冷媒的空气源热泵的室外侧换热器，采用稳态分布参数法，对其作为冷凝器和蒸发器使用时回路的最佳长度进行了计算机模拟，为采用新型环保冷媒的换热器优化设计提供一定的参考。     

铅塔冷凝器的散热研究

分析了韶关冶炼厂锌精馏过程中铅塔冷凝器实际冷凝能力不足,冲顶事故时有发生的原因,并对二系统1#铅塔冷凝器散热进行了测试。测试结果表明:除顶部壁面处于良好的工作状况外,冷凝器各竖壁面的温度沿高度方向的变化显著,温差较大;在同一高度处,冷凝器北壁面温度明显高于东、西两侧壁面温度。     

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%.     

大型同步调相机转子故障温度场分析

随着特高压交直流输电的发展,同步调相机以其快速动态响应能力重新受到关注,同步调相机的安全运行关乎电网的稳定性。论文以TTS-300-2型双水内冷同步调相机为研究对象,建立了其转子三维模型,计算并分析了转子不同负荷下、同一位置不同水路堵塞程度时的转子三维温度场,转子匝间短路和水路堵塞同时存在时的温度场以及转子水路堵塞时的热应力情况,评估故障产生的影响和同步调相机带病运行能力。结果表明,不同负荷下转子温度场分布相似;转子出现故障会导致温度分布不平衡;单个槽内堵塞匝越多,转子温度场畸变越明显;且随堵塞程度的增加,转子热应力随之增加。