Online evaluation and prediction method for calendar lifespan of steam turbine high-temperature durable parts

Abstract

The on-line prediction and evaluation method for calendar service time of high-temperature appliance of steam turbine comprises: if the residual loss prediction value ER of the appliance over the safe allowance EA, proposing the staff to adjust the set value of steam turbine to reduce main steam temperature variable rate during startup and loading variable rate, re-determining the low-cycle fatigue lifetime and the prediction values of annual calendar lifetime loss and residual loss, re-evaluating on-line calendar lifetime till the calendar lifetime on controlled security state. This invention is reasonable and applied.

Description

technical field

[0001] The invention relates to an online evaluation and prediction method for the calendar life of a high-temperature durable part of a steam turbine, which is applied to the online calendar life management of the steam turbine and belongs to the technical field of the steam turbine. Background technique

[0002] The high-temperature durable parts of steam turbines refer to the rotors, cylinders, nozzle chambers, main steam valve casings, control valve casings and steam pipes of high- and medium-pressure steam turbines. The main damage mechanisms for evaluating the life of high-temperature durable parts of steam turbines are creep and low-cycle fatigue. The unit of creep life of high-temperature durable parts of steam turbine is operating hours, and the unit of low-cycle fatigue life of high-temperature durable parts of steam turbine is the number of starts and stops. The calendar life of high-temperature durable parts of steam turbines includes the creep li...

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