Exploration of Construction Organization for Maintenance of Steam Turbine Equipment in Thermal Power Plants

The continuous development of the power industry has had a positive impact on thermal power plants,helping them maintain a good production form.In the use of steam turbine equipment in thermal power plants,to prolong its lifespan and avoid safety hazards,it is necessary to pay attention to strengthening maintenance and construction organization,better implementing effective organizational work,and effectively applying steam turbine equipment to ensure the sustainable development of thermal power plants.This article discusses the concept of equipment maintenance from the perspective of steam turbine equipment in thermal power plants,analyzes the current situation of equipment maintenance,and proposes a specific construction organization to provide a reference for steam turbine equipment maintenance.

16m双柱立车在核电汽轮机低压内缸研制中的必要性分析

本文根据自主型核电汽轮机低压内缸结构、尺寸、重量、精度,加工现状,以及核电汽轮机发展趋势和市场前景,提出了添制16 m双柱立车在核电汽轮机低压内缸研制中的必要性,同时拟定了机床的主要技术参数。

Analysis and Online Diagnosis on Plugging Fault of Servo Valve in Electro-hydraulic Regulating System of Steam Turbine

Through the study on the output signals of the electro-hydraulic regulating system in the thermal power plant, a novel method for online diagnosis of the plugging fault in the servo valve is presented. With the use of the AMESIM software, the changes of the piston displacement, the oil pressure, the magnitude attenuation and the phase lag of the system under different plugging states are studied after simulation. Besides, the influences of the symmetrical and unsymmetrical plugging on the system are also compared and the characteristic table is given. The duo-neural network is put forward to achieve an online diagnosis on the plugging fault of the servo valve. The first level of network helps to make the qualitative diagnosis of the plugging position while the second level is for the quantitative diagnosis of the degree of the plugged position. The research results show that plugging at different positions exerts different influences on the performance of the system. The unsymmetrical plugging mainly affects the regulation time while the symmetrical plugging leads to great changes in the magnitude attenuation and the phase lag.

俄制1000MW核电汽轮机高压缸变形特征的数值分析和实测研究

汽缸是汽轮机的重要部件,且具有很高的加工和安装精度,长期运行后常常出现不可恢复的变形,对其安全经济运行带来负面影响。利用有限元方法分析了某俄制核电汽轮机高压缸在各种因素作用下的变形情况,利用激光三维扫描技术对该汽缸静态下的结构和变形进行了测量,并将二者进行了对比研究。结果表明:温度分布是汽缸变形的主要原因,长时间运行后缸体会产生明显的不可逆规律性变形。

光热汽轮机618mm低压末级叶片开发

依托100MW光热汽轮机组开发了618mm低压末级叶片。结合频繁变工况、低负荷运行等特性,总结提出了光热汽轮机末级叶片开发的基本思路、叶型设计、结构设计等方面的特点。应用有限元数值计算方法分析表明,618mm叶片根部反动度较高,直到30%负荷才出现有少量负反动度情况,变工况性能良好;在小流量极端工况下具有低动应力特性,可以保障变工况运行、低负荷运行的经济性与安全性,为光热汽轮机的开发提供了有益指导。

Calculation of Thermal Stress and Fatigue Life of 1000 MW Steam Turbine Rotor

The paper calculated the temperature and stress fields of 1000 MW ultra-supercritical steam turbine rotors which start in cold condition using the finite element calculation program (ANSYS). After getting rotor stress field, the paper use the general slope method to estimate the low cycle fatigue life loss, the rest of the conditions can be calculated in this method.

湿冷汽轮机变负荷末级1036mm高效叶片气动特性

介绍了湿冷汽轮机变负荷末级1036mm叶片的气动特性。从叶型特点、数值计算方法、分析参数分布规律及在50%、75%、100%负荷下反动度和效率等方面介绍该叶片。

Sensitivity Analysis of Energy Consumption for Cylinder Efficiency of A 1 000 MW Steam Turbine Unit

以东汽1000MW汽轮机为研究对象，采用汽轮机组定功率变工况计算方法，对汽轮机各汽缸效率在THA、70％THA、50％THA、40％THA滑压工况进行敏度分析，得到相应工况下各汽缸效率变化对汽轮机热耗率和机组发、供电煤耗率的影响规律。分析表明，缸效率的能耗敏度随缸效率变化基本呈线性关系；低压缸效率的能耗敏度最大，高压缸效率次之，中压缸效率较小；随机组负荷降低，高压缸效率的能耗敏度增加，中、低压缸效率的能耗敏度变化较小。在THA工况下低压缸效率下降1％，供电煤耗敏度绝对值增加1．246g／（kW·h），相对值升高0．433％；高压缸效率下降1％，供电煤耗敏度的绝对值增加0．44g／（kW．h），相对值升高0．154％；中压缸效率下降1％，供电煤耗敏度的绝对值增加0．352g／（kW．h），相对值升高0．122％。分析结果可对同类型机组进行节能诊断，进而指导机组的优化运行。

Correlation Dimension in Fault Diagnosis of 600 MW Steam Turbine Generator

GP algorithm of correlation dimension computation is ameliorated which overcomes the shortage of traditional one. Improved process of GP algorithm takes the influence of temporal correlative pairs of points on correlation dimension into account and promotes the computational efficiency prominently. Iterative SVD method is applied to remove the influence of noise on the result of correlation dimension. The faults of steam flow turbulence and oil film disturbance which occur in 600 MW Steam Turbine Generator are analyzed and whose correlation dimensions are computed. More distinct quantitative index than FFT is gained to distinguish two faults and it’s of little importance to apply correlation dimension to study the influence of various factors on steam flow turbulence fault for nonexistence of convergent floor in correlation integral curve, which presents a new way to learn the operational function of large capacity steam turbine generator and carry out comprehensive condition monitoring.

On-line Failure Diagnostics for Steam Turbine Hydraulic Governing System

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Application of new techniques to renovation of 200 MW steam turbine

Presents the new techniques leading to the improvements in aerodynamics of 200MW steam turbine high pressure cylinder and mid pressure cylinder, discusses the rear loaded profile and blade bowing, and concludes from numerical simulation and experimental results that the application of rear loaded profile and blade bowing has improved the performance of 200 MW unit.

The Research on the Methods of Diagnosing the Steam Turbine Based on the Elman Neural Network

This paper introduces a kind of diagnosis principle and learning algorithm of steam turbine fault diagnosis which based on Elman neural network. Comparing the results of the Elman neural network and the traditional BP neural network diagnosis, the results shows that Elman neural network is an effective way to improve the learning speed , effectively suppress the minimum defects that the traditional neural network easily trapped in, and shorten the autonomous learning time. All these proves that the Elman neural network is an effective way to diagnose the steam turbine.

灵活性运行1000MW机组汽轮机高压内缸温度场和应力场的有限元模拟

通过对某1000MW机组汽轮机高压内缸现场三维扫描后建模,调取调峰工况下高压内缸进出口温度和压力参数,有限元模拟计算稳态及变负荷工况下该汽轮机高压内缸缸体的温度场和应力场。结果表明,在满负荷和低负荷稳态运行时,高压内缸温度场和应力场分布均匀,低负荷时的最大应力小于满负荷。随着机组负荷的增加或降低,内缸温度变化不大,但其最大应力相应地增大或减小,可见,汽轮机的启停和变负荷会导致高压内缸应力的周期性变化,从而对内缸的疲劳寿命产生影响。

天津石化1200 kt/a乙烯装置裂解气压缩机设备设施及技术分析

近年来,随着乙烯装置规模不断扩大,裂解气压缩机组也向大型化发展。同时,对压缩机组的设计、性能等方面要求更高。基于某200 kt/a乙烯装置裂解气压缩机组在运行中出现的问题,介绍了天津石化1200 kt/a乙烯装置裂解气压缩机及驱动汽轮机的设备设施和相关技术,其中多项技术的创新应用,解决了乙烯装置中部分关键问题,为后续更大规模乙烯装置的设计及建设提供有力的保障。

A Diagnosis Method of Vibration Fault of a Steam Turbine Based on Information Entropy and Grey Correlation Analysis

The vibration fault, one of the common faults in the steam turbine generator unit, brings great damage to the production and the running process. It is well known that the information entropy is to describe the degree of indeterminacy of the system, so the information entropy can be used to measure Despite its efficiency, one kind of information entropy is just enabled to identify make up for this limitation, based on nalysis was studied for vibration fault the vibration condition of the unit. certain part of the faults. In order to the faulty signals collected from the rotor test platform, the grey correlation adiagnosis of steam turbine shafting in this paper. The reference faulty matrix and the calculation model of grey correlation degree was established based on three kinds of information entropy. The analysis shows that grey correlation analysis is a useful method for fault diagnosis of shafting and can be used as a quantitative index for fault diagnosis.

超超临界二次再热1000MW机组汽轮机高-低压缸对轮对振动影响治理

某发电企业2×1000MW超超临界二次再热机组汽轮机运行启动期间轴承存在振动偏大现象,对振动原因进行分析,查找相关原因,重新调整中压缸与低压缸对轮数据。

超超临界机组汽轮机转子用9%-12%Cr耐热钢研究

文章介绍了超超临界汽轮机转子用9%-12%Cr耐热钢的发展历程,重点阐述了其基体组织与强化相的研究进展,并探讨了含B的9%-12%Cr转子用中存在的问题,展望了超超临界机组汽轮机转子用耐热钢中的发展趋势。

1000 MW核电汽轮机超速保护系统方案分析与优化

1000 MW核电汽轮机的电子超速保护系统的硬件检测回路需定期自检。自检时继电器轮流频繁动作,可能导致触点故障,因此有必要对电子超速保护系统进行分析和优化。介绍了1000 MW核电汽轮机电子超速保护系统的原理,分析了电子超速保护系统的三取二逻辑的实现策略和硬件回路保护方案,总结了系统的优点和存在的风险,并针对系统在自检过程中因叠加触点单一故障而导致误跳机的问题,提出了2套并线优化方案。对方案进行了分析对比,认为4路并线优化方案可以有效降低系统自检过程中的误跳机概率,提高运行可靠性。研究成果可为同类机型的汽轮机电子超速保护系统设计提供参考。

Optimum Tilt Angle of Flow Guide in Steam Turbine Exhaust Hood Considering the Effect of Last Stage Flow Field

Abstract Heat transfer and vacuum in condenser are influenced by the aerodynamic performance of steam tur- bine exhaust hood. The current research on exhaust hood is mainly focused on analyzing flow loss and optimal design of its structure without consideration of the wet steam condensing flow and the exhaust hood coupled with the front and rear parts. To better understand the aerodynamic performance influenced by the tilt angle of flow guide inside a diffuser, taking a 600 MW steam turbine as an example, a numerical simulator CFX is adopted to solve compressible three-dimensional （3D） Reynolds time-aver- aged N-S equations and standard k-e turbulence model. And the exhaust hood flow field influenced by different tilt angles of flow guide is investigated with consideration of the wet steam condensing flow and the exhaust hood coupled with the last stage blades and the condenser throat. The result shows that the total pressure loss coefficient and the static pressure recovery coefficient of exhaust hood change regularly and monotonously with the gradual increase of tilt angle of flow guide. When the tilt angle of flow guide is within the range of 30~ to 40~, the static pressure recovery coefficient is in the range of 15.27% to 17.03% and the total pressure loss coefficient drops to approximately 51%, the aerodynamic performance of exhaust hood is significantly improved. And the effectiveenthalpy drop in steam turbine increases by 0.228% to 0.274%. It is feasible to obtain a reasonable title angle of flow guide by the method of coupling the last stage and the condenser throat to exhaust hood in combination of the wet steam model, which provides a practical guidance to flow guide transformation and optimal design in exhaust hood.

某100%容量给水泵汽轮机经济性分析

文章针对某100%容量给水泵汽轮机从配汽、汽源切换、通流能力等方面进行了论述,为以后此类100%容量给水泵汽轮机的设计提供了参考。同时分析了100%BMCR容量给水泵汽轮机的实际运行经济性水平,结果表明:相较于2×50%BMCR容量汽动给水泵,采用100%容量汽动给水泵,给水泵汽轮机效率可提升6个百分点,可降低火电机组热耗率约16 kJ/(kW·h),提高整机效率约0.2%,降低供电煤耗约0.6 g/(kW·h),年节省的煤碳成本约240万元。