A performance and structure design and monitoring method for a high-medium pressure cylinder of an air-cooled high-parameter steam turbine

Abstract

The invention provides a performance and structure design method, a performance monitoring method and a structure safety monitoring method for a high-pressure cylinder and a medium-pressure cylinder of an air-cooled high-parameter steam turbine. The power and thermal performance of the high-pressure cylinder and the medium-pressure cylinder of the air-cooled high-parameter steam turbine are ensured through new technologies of steam inlet and exhaust parameter design, flow and structural size modular design, enthalpy drop optimal distribution, variable reaction degree design and the like of thehigh-pressure cylinder and the medium-pressure cylinder in the design stage. Structural safety of the high-pressure cylinder and the medium-pressure cylinder of the air-cooled high-parameter steam turbine is guaranteed through new technologies of structural design, material design, moving blade strength vibration design, rotor creep and strength and service life design, inner cylinder creep and strength and service life design, air cylinder tightness design and the like of the high-pressure cylinder and the medium-pressure cylinder in the design stage. The technical effect of optimizing and controlling the thermal performance and the structural safety performance of the high-pressure cylinder and the medium-pressure cylinder of the air-cooled high-parameter steam turbine through a designmonitoring method of performance optimization and structural improvement is achieved.

Description

technical field [0001] The invention relates to a performance and structure design and monitoring method of a high-pressure cylinder and a medium-pressure cylinder of an air-cooled high-parameter steam turbine, belonging to the technical field of steam turbines. Background technique [0002] To build a thermal power plant in a water-scarce area, it is necessary to use an air-cooled high-parameter steam turbine. Its technical feature is that the water consumption is 25% of that of a wet-cooled generator set, and the water-saving effect is very significant. The exhaust pressure of the air-cooled turbine under the rated working condition is 10kPa to 16kPa, which is 2 to 3 times the exhaust pressure of the low-pressure cylinder of the wet-cooled steam turbine which is 4.9kPa. Due to the high exhaust pressure of the low-pressure cylinder of the air-cooled steam turbine, under the same inlet steam parameters, the isentropic enthalpy drop of the air-cooled steam turbine is smaller ...

AI Technical Summary

Problems solved by technology

[0004] If the design and monitoring of the performance and structure of the high-pressure cylinder and the medium-pressure cylinder of the air-cooled high-parameter steam turbine are improper, the power of the air-cooled high-parameter steam turbine will be insufficient, the heat consumption rate will increase, and the service life will be shortened, which will affect the economy of the air-cooled high-parameter steam turbine. safe operation

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