炼油厂烟气轮机转子叶片的断裂

对某炼油厂烟气轮机失效的叶片进行了化学成分，性能、金相、断口及应力分析研究后认为，烟机转子叶片断裂的原因主要与叶片嵌入部位的几何形状和材料的微观组织结构等有关。     

烟气轮机转子的修复,运行及振动监测

九江石化总厂一套催化裂化烟气能量回收装置系从美国英格索兰公司引进,机组布置如图1所示,包括烟气轮机(E-138,单级悬臂水平剖分式)、轴流风机、齿轮箱和电动/发电机组.烟机入口温度645℃,出口温度528℃,     

双级烟气轮机转子拉杆螺栓的热装

分析了双级烟气轮机转子拉杆螺栓热装工艺过程中出现的技术难题,通过理论计算和数据统计分析,提出了不同于传统的计算方法,简化了热装过程,保证了双级烟气轮机转子拉杆螺栓热装一次成功。     

烟气轮机的运行维护及维修

介绍了烟气轮机现场安装、开工、处理运行中出现的问题,分析了影响烟气轮机正常运行的因素并对其维护、维修方面进行了阐述.     

GHH烟气轮机叶片改型对效率的影响

分析了GHH烟气轮机的结构特点,并通过减小静叶安装角、缩小静叶列通疏截面、降低反动度对其进行改型,改善了烟气轮机的使用性能,回收能力大幅提高,国产化成效显著.     

DH型离心压缩机组找正的实践

以DH63-14离心压缩机轴心找正为实例,通过对假轴挠度及温度的影响因素分析,消除了联轴器找正误差,从而保证了机组的正常运行.提出了主机本体联轴器与电机联轴器之间由中间轴联接的设备轴心找正的方法.     

大型烟气轮机拉杆螺栓热装工艺探讨

针对大型烟气轮机拉杆螺栓热装中存在的几个关键问题,通过分析给出了解决的办法,并取得了良好的效果,形成了成熟完整的热装工艺。     

烟气轮机静叶片安装角再加工

从改变已有静叶片的安装角,使库存或报废静叶片再利用,介绍了烟气轮机静叶片安装角再加工的方法以及在生产中的实际应用。     

试验机安装不正对示值精度影响及找正方法

本文论述了试验机安装不正对未值精度影响,试验机安装垂直度的初步及精确找正方法。     

烟气轮机导流锥的焊接修复

一、问题的提出 抚顺石油二厂北催化裂化装置中的烟气轮机是我国第一套转置。导流锥是该烟气轮机的咽喉部件,其作用是使再生器产生的高温烟气沿流动方向保持均匀加速,且使烟气中催化剂微粒均匀分布,并沿轴向完全对称地进入烟机静叶,驱动烟机转动。     

大型机组光电对中校准方法的研究

基于位置敏感探测器(PSD)与光电技术,提出了大型机组对中校准的理论模型.利用最小二乘法原理,多点拟合轴瓦圆心及最佳调整空间轴心直线;建立了基于迭代算法的偏微分数值方程组,利用矩阵迭代法编程求解,确定轴瓦最佳调整量,解决了大型涡轮机组轴瓦对心校准问题.通过仿真实验验证了理论模型的正确性.     

Failure of gas turbine blades

The first-stage blades of a gas turbine had suffered a severe deterioration after around 10 500 h service. The expected service life was 40 000 h. Failure analysis (visual observations, studies by optical microscopy, scanning electron microscopy (SEM), SEM back-scattered electron (SEM-BSE), EDX, X-ray diffraction (XRD) and dimensional metrology) has been carried out. Blades, manufactured in the nickel superalloy CMSX-4, lost the protective coatings from their tips due to wear. Unprotected surfaces suffered high-temperature hot corrosion (Type-I corrosion). It is concluded that failure was mainly caused by an uneven clearance (out-of-line) between rotor and lining.     

Conjugated heat transfer and temperature distributions in a gas turbine combustion liner under base-load operation

Prediction of temperature distributions on hot components is important in development of a gas turbine combustion liner. The present study investigated conjugated heat transfer to obtain temperature distributions in a combustion liner with six combustion nozzles. 3D-numerical simulations using FVM commercial codes, Fluent and CFX were performed to calculate combustion and heat transfer distributions. The temperature distributions in the combustor liner were calculated by conjugation of conduction and convection (heat transfer coefficients) obtained by combustion and cooling flow analysis. The wall temperature was the highest on the attachment points of the combustion gas from combustion nozzles, but the temperature gradient was high at the after shell section with low wall temperature.     

高速汽轮机泵推力轴承的设计与功耗问题

以推力可倾瓦轴承为例。在各种参数下，计算了轴承的最高油温、最小油膜厚度以及轴承的功耗。从分析结果可知，无论怎样改变轴承外径do,支点位置半径rp和位置角β都难以有效地降低轴承的功耗。当轴承的瓦块数量减少时，轴承的功耗才能得到有效的降低。     

In-situ measurement of reflection coefficient and its application to predicting combustion instability in a gas turbine combustor

Journal of Mechanical Science and Technology - Here, a procedure that uses in-situ data recorded by two microphones placed inside an operating gas turbine combustor to determine the reflection...     

双级烟气轮机的结构改进

针对YL型赢级烟气轮机在运行中出现蜘催化剂在两圾轮盘间的堆积、二级转盘进气端面二次流冲蚀、二级静叶组变形等影响长周期正常运行的问题，通过结构改进，得到了解决，实践证明是行之有效的。     

浅析燃气轮机的可靠性及应用

随着燃气轮机的广泛运用,提高燃气轮机可靠性已经成为十分关注的问题。根据燃气轮机的基本工作原理,对其可靠性的影响因素进行了简单的分析,并就提高其可靠性措施做了简单描述。     

Evaluation of gas path analysis methods for gas turbine diagnosis

In the present paper, limitations concerning three implementations of gas path analysis (GPA) methods are investigated and their diagnostic effectiveness is evaluated. The methods were tested for different sets of faults on a twin shaft gas turbine with an instrumentation set typical of today’s engines. Test results revealed that classical GPA is not sufficient. Correct diagnosis is provided only when one already knows a subset of components containing the fault; otherwise, the fault may be attributed to other component (s). The effectiveness of a second method that implements Multi Operating Point Analysis (MOPA) is related with the assumption of non varying health parameters with deviations along with the operating point. Cases of wrong diagnosis were detected when the above assumption was violated. Improvement on the diagnostic effectiveness of the MOPA method has been verified through careful selection of the parameters defining the operating point. Further improvement on diagnostic ability was achieved when a third, recently proposed method was applied. The method uses information produced from existing sensors when artificial operating points are defined close to the initial operating point. It was found that the third method can detect and correctly identify faults even in cases where the multipoint method fails.     

Analysis of the combustion oscillation in a silo-type gas turbine combustor and its suppression

The characteristics of combustion oscillation of a silo-type 79.5 MW gas turbine combustor in commercial operation and its suppression have been investigated. The oscillation of the lean premixed gas turbine combustor resulting from the combustion instability occurred at near full load operation. An FFT analysis of the combustion dynamics showed that the dominant frequency of the oscillation would be that of the 1st longitudinal acoustic resonance mode of the combustor. To suppress the combustion oscillation, a passive control technique for reducing the combustion instability was employed; that is, the fuel to the combustor was redistributed by adjusting the operational schedule of one of six fuel control valves, which would lead the increase of the local operational equivalence ratio near the central recirculation zone of the combustor. By doing so, the oscillation was successfully reduced to the permissible level while the amount of NO_x emission met proper regulatory level set by the local government.     

Wear characteristics of commercial gas turbine components

Wear is one of the common degradations in a commercial gas turbine. A stainless steel grade 304 (SS 304) fuel nozzle and its collar made of nickel-based superalloy (Hastelloy X) are two vital components that normally suffer from rapid wear. During an installation, the fuel nozzle is slotted into the collar of the combustion liner. In operation, these two surfaces are subjected to high pressure from the fuel combustion, hence continuously rubbing against each other causes vibrations. During the start–stop operation, these surfaces had undergone a large relative motion. The vibration is the main cause of the wear occurrence on the surfaces. Physical properties of the worn surfaces were obtained through visual observations: wear measurement, hardness and microstructure examination. Through visual observations, fretting wear was mainly suspected as the dominant wear mode, particularly after 8,000 of running hours at high temperature and vibration. In short, this paper discusses the preliminary findings of wear on the fuel nozzle and its collar. It also discusses the changes in the mechanical properties before and after the operation. Solutions for mitigating the problem were discussed.