Mathematical deviation analysis of characteristic performance points of the turbine condenser pump after bypass modification

IF 2.7 3区工程技术 Q2 ENGINEERING, MECHANICAL

Flow Measurement and Instrumentation Pub Date : 2025-08-27 DOI:10.1016/j.flowmeasinst.2025.103041

Dušan Strušnik , Jurij Avsec

{"title":"Mathematical deviation analysis of characteristic performance points of the turbine condenser pump after bypass modification","authors":"Dušan Strušnik , Jurij Avsec","doi":"10.1016/j.flowmeasinst.2025.103041","DOIUrl":null,"url":null,"abstract":"<div><div>This article presents a detailed mathematical deviation analysis of the characteristic performance points of a turbine condenser pump following a bypass system modification. The primary task of the turbine condenser pump is to pump condensate from the condenser into the boiler feedwater system. Additionally, the condensate from the condenser pump serves as cooling water for auxiliary systems, such as ejector system cooling and steam dump device cooling. The condenser pump must operate within its characteristic performance properties to ensure the appropriate flow and pressure required for the uninterrupted operation of these systems. The bypass system, which is essential for directing steam during the start-up and trip of the steam turbine, was modified to improve operational flexibility and reliability. To determine the reliability of the condenser pump after the modification, reliability measurements were performed. The reliability was assessed by comparing the characteristic performance points provided by the manufacturer with the measured characteristic points. These measurements were conducted under both atmospheric and vacuum conditions in the turbine condenser. The results indicate that the deviations between the characteristic performance properties specified by the manufacturer and those measured are negligibly small. Minor deviations due to changes in pressure conditions are reflected in the net positive suction head (NPSH) of the condenser pump, and measurements show that operation with an NPSH greater than 1.5 m remains safe. The remaining deviations in characteristic performance properties are within acceptable limits, amounting to up to 3 %. Overall, the results reveal that the bypass modification does not adversely affect pump performance, and the observed shifts in characteristic performance curves are within tolerable operational limits, ensuring continued reliability and stability of the condenser system.</div></div>","PeriodicalId":50440,"journal":{"name":"Flow Measurement and Instrumentation","volume":"107 ","pages":"Article 103041"},"PeriodicalIF":2.7000,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Flow Measurement and Instrumentation","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S095559862500233X","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}

引用次数: 0

Abstract

This article presents a detailed mathematical deviation analysis of the characteristic performance points of a turbine condenser pump following a bypass system modification. The primary task of the turbine condenser pump is to pump condensate from the condenser into the boiler feedwater system. Additionally, the condensate from the condenser pump serves as cooling water for auxiliary systems, such as ejector system cooling and steam dump device cooling. The condenser pump must operate within its characteristic performance properties to ensure the appropriate flow and pressure required for the uninterrupted operation of these systems. The bypass system, which is essential for directing steam during the start-up and trip of the steam turbine, was modified to improve operational flexibility and reliability. To determine the reliability of the condenser pump after the modification, reliability measurements were performed. The reliability was assessed by comparing the characteristic performance points provided by the manufacturer with the measured characteristic points. These measurements were conducted under both atmospheric and vacuum conditions in the turbine condenser. The results indicate that the deviations between the characteristic performance properties specified by the manufacturer and those measured are negligibly small. Minor deviations due to changes in pressure conditions are reflected in the net positive suction head (NPSH) of the condenser pump, and measurements show that operation with an NPSH greater than 1.5 m remains safe. The remaining deviations in characteristic performance properties are within acceptable limits, amounting to up to 3 %. Overall, the results reveal that the bypass modification does not adversely affect pump performance, and the observed shifts in characteristic performance curves are within tolerable operational limits, ensuring continued reliability and stability of the condenser system.

查看原文本刊更多论文

涡轮凝汽器泵旁路改造后特性性能点的数学偏差分析

本文对某涡轮凝汽器泵旁路系统改造后的特性性能点进行了详细的数学偏差分析。汽轮机凝汽器泵的主要任务是将凝汽器中的冷凝水泵入锅炉给水系统。另外，冷凝器泵的冷凝水作为辅助系统的冷却水，如喷射器系统冷却和蒸汽倾倒装置冷却。冷凝器泵必须在其特性性能范围内运行，以确保这些系统不间断运行所需的适当流量和压力。旁路系统在汽轮机启动和跳闸过程中起着引导蒸汽的作用，为了提高运行的灵活性和可靠性，对旁路系统进行了改造。为了确定改造后冷凝器泵的可靠性，进行了可靠性测试。通过比较制造商提供的特征性能点与测量的特征点来评估可靠性。这些测量是在常压和真空条件下在涡轮冷凝器中进行的。结果表明，制造商规定的特性性能与测量值之间的偏差可以忽略不计。由于压力条件变化引起的微小偏差反映在冷凝器泵的净正吸压头（NPSH）上，测量表明，NPSH大于1.5 m时运行仍然是安全的。特性性能的剩余偏差在可接受的范围内，最多可达3%。总体而言，结果表明旁路改造不会对泵的性能产生不利影响，并且观察到的特性性能曲线的变化在可容忍的运行范围内，确保了冷凝器系统的持续可靠性和稳定性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Flow Measurement and Instrumentation 工程技术-工程：机械

CiteScore

4.30

自引率

13.60%

发文量

123

审稿时长

6 months

期刊介绍： Flow Measurement and Instrumentation is dedicated to disseminating the latest research results on all aspects of flow measurement, in both closed conduits and open channels. The design of flow measurement systems involves a wide variety of multidisciplinary activities including modelling the flow sensor, the fluid flow and the sensor/fluid interactions through the use of computation techniques; the development of advanced transducer systems and their associated signal processing and the laboratory and field assessment of the overall system under ideal and disturbed conditions. FMI is the essential forum for critical information exchange, and contributions are particularly encouraged in the following areas of interest: Modelling: the application of mathematical and computational modelling to the interaction of fluid dynamics with flowmeters, including flowmeter behaviour, improved flowmeter design and installation problems. Application of CAD/CAE techniques to flowmeter modelling are eligible. Design and development: the detailed design of the flowmeter head and/or signal processing aspects of novel flowmeters. Emphasis is given to papers identifying new sensor configurations, multisensor flow measurement systems, non-intrusive flow metering techniques and the application of microelectronic techniques in smart or intelligent systems. Calibration techniques: including descriptions of new or existing calibration facilities and techniques, calibration data from different flowmeter types, and calibration intercomparison data from different laboratories. Installation effect data: dealing with the effects of non-ideal flow conditions on flowmeters. Papers combining a theoretical understanding of flowmeter behaviour with experimental work are particularly welcome.