Predicting method for steam turbine high temperature component creep life

Abstract

The present invention relates to a creep life prediction system of steam turbine high-temperature parts. Said system is characterized in that it consists of calculation / application server and software for a creep life prediction, a data base server, outer system interfaces, temperature monitoring thermocouples of each high-temperature parts, a homepage server and an user end web browser, wherein the homepage server is connected respectively to the calculation / application server, the data base server and the user end web browser, the calculation / application server is connected to the data base server, the data base server is connected respectively to each temperature monitoring thermocouple of each high-temperature parts through the outer system interfaces. The prediction method comprises the following steps: inputting basic data; calculating the number of the accumulative total working hours of each temperature section; calculating the creep life loss Eti of each temperature section; calculating the accumulative total creep life loss Et; ascertaining a threshold value DC of the accumulative total creep life loss; calculating the creep life loss velocity e; calculating the residual creep life HLC; and recommending maintenance and treatment measures. The advantage of the present invention is that the residual creep life of a steam turbine high-temperature part is capable of being predicted quantificationally during the using stage of a steam turbine.

Description

Technical field [0001] The invention relates to a method and system for predicting the creep life of high-temperature components of a steam turbine, in particular to an online prediction method and system of cumulative creep life loss and remaining creep life of high-temperature components of a steam turbine, which is applied to the life management of steam turbines, and belongs to The field of steam turbine technology. Background technique [0002] The strength design specification for high temperature components of steam turbines uses the durability or creep limit of the material at the working temperature divided by the safety factor to obtain the allowable stress. The design criterion is that the equivalent stress is not greater than the allowable stress. The endurance strength is the stress at which the material breaks in 100,000 hours at a given temperature, and the creep limit is the stress at which the material undergoes 1% of the total plastic deformation in 100,000 hour...

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Problems solved by technology

Existing technology can calculate the creep life of steam turbine high-temperature components at a certain working temperature, such as the paper "Design and Evaluation of Creep Life of Large Steam Turbine Components" published in "Proceedings of the Chinese Society for Electrical Engineering" No. 3, 2002, but Since the operating temperature of the high temperature components of the same steam turbine is different under different loads of the steam turbine, there is no suitable method and system for online prediction of the remaining creep life of the high temperature components of the steam turbine under different loads

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