特大功率烟气轮机转子销孔的加工

根据特大功率烟气轮机转子销孔的加工要求，以及两种合金材料的机械性能，论述了绞刀材料的选择及刀具几何参数的设计，给出了加工销孔的工艺路线和使用效果.     

烟气轮机径向轴承轴瓦的加工制造

介绍了烟气轮机径向轴承轴瓦手工刮削式和机加工偏心式的特点和加工制造，并通过数据分析，指出了机加工偏心式轴瓦的优点。     

电火花在烟气轮机叶片加工中的应用

我厂生产制造烟气轮机已20多年,其关键零件动叶片的加工一直采用传统的加工工艺,即粗抛、精抛型面均采用手工抛磨.这种方法劳动强度大、粉尘多、安全系数低、质量不易控制.为了提高动叶片的加工质量、减少工人劳动强度、改善加工环境,采用了电火花成型加工来代替传统的手工粗抛磨加工.     

烟气轮机油封的加工改进

简要介绍了油封在烟气轮机中的作用,详细阐述了油封设计和加工制造中的不足,给出了油封的改进设计,并对新的工艺路线作了概括说明。     

催化裂化烟气轮机技术改造

针对烟气轮机振动超过报警限和人工停机限的情况,通过加大一、二级轮盘的间隙,实现了机组的平稳运行,减少了烟气排放量,减轻了检维修强度。     

烟气轮机的振动原因分析

本文介绍烟气轮机开展状态监测的做法、典型案例的振动原因分析及取得的显著效果。     

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。     

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。     

关于提高烟气轮机叶片寿命的探讨

烟气轮机的叶片状况,直接决定了烟气轮机能否高效率长期运转。本文就如何提高烟气轮机叶片寿命的问题作一探讨。 一、叶片的工况条件 通常烟气轮机叶片处于温度高达640℃～680℃流量高达970～1350m~3/min,流速150～17m/s,含有催化剂微粒150～160mg/m~3(标)的烟气中运     

烟气轮机试车轴振动超标解决方案

针对YL4000G型烟气轮机在试车过程中出现后轴承处轴振动值超标的现象，对该烟机所使用的可倾瓦轴承的结构进行改进设计，重点在轴承泄油回路的改进设计方面进行了阐述。     

水下航行器燃气涡轮机主要结构类型的分析

这里在全面分析水下航行器动力系统的工作要求和特点的基础上,研究确定了水下航行器涡轮机应采取的主要结构类型。主要是通过对单级、定工况、带小反力度的冲动式、采用不完全对称叶型的燃气涡轮机进行强度校核,来讨论水下航行器在满足航行条件时,采用此种结构类型是否可行。     

中小型燃气轮机试验台主设备基架的有限元分析

针对中小型燃气轮机试验台主设备基架结构设计可行性和螺栓连接结合面钢化模型适用范围等问题,对不带箱装体燃气轮机机组、带箱装体燃气轮机机组以及水力测功器机组载重状态下基架结构动力学特性等方面进行了有限元分析,对机组载重状态以及螺栓连接结合面的处理方法进行了归纳,提出了将质量单元法应用到机组载重状态的模拟中以及将弹簧单元法和钢化模型技术应用到螺栓连接结合面的模拟中。研究结果表明,两种螺栓连接结合面处理方法下,不带/带箱装体燃气轮机基架的模态计算结果最大偏差为2.85%,水力测功器基架的结果最小偏差为19.2%;同时,主设备基架的结构动力学分析结果验证了其结构设计满足使用要求,进而为试验的安全运行提供保障。     

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.     

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。     

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。     

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.     

燃气轮机动态仿真容积效应法研究

针对燃气轮机动态建模容积效应法运用过程中,使用真实体积运算时计算结果振荡较大,无法对燃气轮机动态过程进行实时有效的运算的问题,对容积效应法的原理进行分析,提出了采用虚拟容积计算方法计算容积大小.采用面对对象的模块化建模方法,基于Matlab/Simulink平台,运用容积效应法建立了燃气轮机动态仿真模型,解决了在常规建模时迭代次数太多的问题.分别计算了在相同工况变化条件下,采用真实容积和虚拟容积方法建立的两种模型的仿真结果.研究结果表明,采用虚拟容积的仿真模型更稳定,并且计算结果更准确.     

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.