The Secure Service Life And On-line Monitoring System Of The Flue Gas Turbine Disk

Nowadays, in the common cause of failure in the catalytic cracking unit, the proportion of the gas turbine downtime is very high due to the occurrence of problems caused by Flue Gas Turbine. Whether flue gas turbine can run smoothly directly affect the entire unit, and even affect the safety of the entire operation of the catalytic device, it seriously affected economic and social benefits,Gas turbine has harsh working environment, the speed is generally in the range of 6000 7000 r / min and the working medium is mainly smoke. Not only in the temperature range of 600 700 ?, and wherein there are still some corrosive components, there are some other hard Al₂O₃ and SiO₂ catalyst particles. Especially in the event of flue gas turbine work, these factors are generally exhibited relatively strong instability, its failure rate is very high. If the flue gas turbine failure occurs in certain, it will cause serious economic losses. Flue gas has a certain corrosive media, once the separation of the catalyst is not ideal, it is easy to smoke in the presence of a large number of catalyst particles, the wheel position can cause serious damage. in order to ensure Flue gas turbine run long-term, stable, secure and efficient, the wheel of flue gas turbine must be on the monitoring priorities, it is necessary to be able to develop a wheel of flue gas turbine being in real-time monitoring and safety assessment methods in order to determine the gas turbine operating status and fault identification roulette.Contents of this article covers the development and research status at home and abroad in the hood roulette lifetime research. it also points out the shortcomings and problems of life roulette research and detection. This paper summarizes the main features of the wheel was damaged. On this basis, the safety life design method roulette data were analyzed and discussed, focusing on the influence of the mean stress, size effect and multiaxial stress and strain and other factors on fatigue life, and the fatigue life is discussed dispersion. These analyzes and discussions laid a theoretical foundation to study and improve life prediction model roulette. This paper presents an improved roulette strain life prediction model; systematically derived a number of factors to consider dangerous position on the wheel fatigue life and specific affect the results. Studies have shown that the accuracy of life prediction model proposed is higher than other conventional models and methods of forecasting. The disk LCF test successfully completed a full-size hood roulette temperature low cycle fatigue test and get the roulette high temperature low cycle fatigue crack initiation life and crack propagation life, then verified the proposed life prediction model correction formula and engineering applicability.Strain life prediction model proposed in this paper can determine the working status and fault identification roulette flue gas turbine failure especially in the early part of the sign. It's timely identification of the fault location and severity of judge determines fault trends, proactive maintenance in the flue gas turbine performance drops to a certain extent some or imminent failure. It will help improve the hood availability and reduce the occurrence of major accidents, but this can also clear maintenance objectives, extended equipment overhaul interval, reducing the small repair frequency, to avoid the lack of maintenance and the problems blind maintenance, effectively reducing the maintenance costs. For the security, stability and long-term operation of flue gas turbine provides a more reliable technical and management support.