A usage life monitoring device used for a high and middle pressure cylinder of a frequently rapid start and stop combined cycle steam turbine

Abstract

The invention discloses a usage life monitoring device used for a high and middle pressure cylinder of a frequently rapid start and stop combined cycle steam turbine. Strain changes of a high and middle pressure cylinder are sensed by strain gages, and strain values are transmitted to the strain gauges to conduct observation. A data logger is used to carry out recording and storing. A life evaluation server carries out real time processing on the measured strain information, and converts the information into stress information of key positions of the high and middle pressure cylinder. A temperature sensor and a pressure sensor are utilized to sense changing information of the temperature and the pressure of the high and middle pressure cylinder, and provide the information for the life evaluation server to calculate a temperature field and a stress field of the high and middle pressure cylinder in real time. With consideration given to stress distribution measured by the foil gauges of the high and middle pressure cylinder and stress field distribution obtained through value calculating, and according to a creep deformation life curve and a fatigue life curve of materials of the high and middle pressure cylinder, the real-time life consumption rate of the high and middle pressure cylinder of the frequently rapid start and stop combined cycle steam turbine and an accumulative life consumption real-time monitoring curve of the high and middle pressure cylinder are obtained.

Description

Technical field: [0001] The invention relates to a life monitoring device for high and medium pressure cylinders, in particular to a life monitoring device for high and medium pressure cylinders of a combined cycle steam turbine with frequent and quick start and stop. Background technique: [0002] The high and medium pressure cylinder is an important part of the steam turbine. For the combined cycle steam turbine with frequent start and stop, the life management of the high and medium pressure cylinder is one of the key technologies related to the safety and economy of the unit. Domestic gas turbine combined cycle peaking units are frequently started and stopped, which affects the service life of combined cycle units. The reliability requirements of the peaking unit are higher, and the safety requirements for the relevant high and medium pressure cylinders supporting the unit are also higher. [0003] Thermal stress is the stress caused by the inability of the metal to exp...

AI Technical Summary

Problems solved by technology

At present, the life management of steam turbines mostly adopts the numerical calculation method, and the real-time life monitoring and management system is rarely applied to the actual unit, and the traditional numerical calculation results have large errors and low accuracy, which need to be corrected through the regular inspection and testing of the actual unit valves , can not achieve the purpose of real-time monitoring

Images