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首页> 外文会议>American Society of Mechanical Engineers(ASME) Power Conference 2006; 20060502-04; Atlanta,GA(US) >COMPARISON BETWEEN AMERICAN AND EUROPEAN METHODS FOR ADMITTING BYPASS STEAM INTO A STEAM SURFACE CONDENSER ADVANTAGES AND DISADVANTAGES OF EACH PRACTICE
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COMPARISON BETWEEN AMERICAN AND EUROPEAN METHODS FOR ADMITTING BYPASS STEAM INTO A STEAM SURFACE CONDENSER ADVANTAGES AND DISADVANTAGES OF EACH PRACTICE

机译：美洲通行证和欧洲通行证方法将通行蒸汽引入蒸汽表面冷凝器的优点和每种做法的缺点的比较

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摘要

Combined cycle plants are in operation in every part of the globe. The majority of the combined cycle plants have been designed by architect engineering companies in the USA or in Europe. The US standards for plant design are different from those in Europe. In spite of the differences, both design practices achieve the common goal of efficient and reliable electrical power generation.rnThe method for admission of bypass steam into a condenser in the U.S. is substantially different from that in Europe. In the US practice, bypass steam entering the condenser is at relatively high pressures and is superheated. In the European practice, the bypass steam entering the condenser is at relatively low pressures and is wet. Each practice serves the common purpose of condensing bypass steam in the condenser and each practice has its own disadvantages and disadvantages.rnTube failures are encountered in each practice. These tube failures are caused by droplets in the (moist) high velocity bypass steam. Low condenser pressures, improper design / control / operation of pressure reducing desuperheating valve (PRD valve), and improper drainage of bypass header lines are some of the major reasons that cause an environment favorable for tube failures.rnThis paper examines the US and European methods for admitting bypass steam into a condenser. The advantages and disadvantages of each practice are discussed. For each practice, the performance in bypass mode for varying condenser pressures, bypass steam flow rates, support plate spacing, and moisture pockets quality are evaluated. Both actual and critical steam velocities are calculated. Condenser operating points prone to flow-induced vibration and associated tube failures are predicted.
机译：联合循环工厂在全球各地都在运行。大多数联合循环工厂是由美国或欧洲的建筑师工程公司设计的。美国的工厂设计标准与欧洲的标准不同。尽管存在差异，但这两种设计实践均实现了高效，可靠地发电的共同目标。在美国，将旁路蒸汽引入冷凝器的方法与欧洲的方法大不相同。在美国的实践中，进入冷凝器的旁通蒸汽处于相对较高的压力下并且过热。在欧洲的实践中，进入冷凝器的旁通蒸汽处于较低压力下并且是湿的。每种方法都具有在冷凝器中冷凝旁路蒸汽的共同目的，并且每种方法都有其自身的缺点和缺点。在每种方法中都会遇到管道故障。这些管故障是由（潮湿）高速旁通蒸汽中的液滴引起的。冷凝器压力低，降压减温阀（PRD阀）的设计/控制/操作不当以及旁路总管的排水不当，是造成有利于管道故障的环境的一些主要原因.rn本文研究了美国和欧洲的方法用于允许旁路蒸汽进入冷凝器。讨论了每种做法的优缺点。对于每种实践，均会评估旁路模式下改变冷凝器压力，旁路蒸汽流量，支撑板间距和水分袋质量的性能。计算实际和临界蒸汽速度。可以预测冷凝器的工作点容易发生流动引起的振动以及相关的管道故障。

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