Device and method for on-line monitoring of transient-state low-cycle fatigue life loss of pressure-containing member outside boiler

Abstract

The invention relates to a device and a method for the on-line monitoring of the transient-state low-cycle fatigue life loss of a pressure-containing member outside a utility boiler. The device comprises a transient-state low-cycle fatigue life loss compute server, wherein the transient-state low-cycle fatigue life loss compute server is connected with a utility boiler decentralized control device through a factory-level monitoring information device. The method comprises the following steps: reading the data of the on-line measuring points of the utility boiler; calculating the heat stress and the mechanical stress of a pressure-containing member outside the utility boiler; calculating the stress intensity of the pressure-containing member outside the utility boiler; calculating the low-cycle fatigue strain amplitude of the pressure-containing member outside the utility boiler; calculating the low-cycle fatigue life of the pressure-containing member outside the utility boiler; determining the maximum transient-state low-cycle fatigue life loss of the pressure-containing member outside the utility boiler; determining the threshold value of the transient-state low-cycle fatigue life loss; and controlling the transient-state low-cycle fatigue life loss of the pressure-containing member outside the utility boiler. The invention realizes the on-line calculation and control of the transient-state low-cycle fatigue life loss of the pressure-containing member outside the utility boiler.

Description

technical field [0001] The invention relates to an on-line monitoring device and method for transient low-cycle fatigue life loss of external pressure-bearing components of a power station boiler, belonging to the technical field of power station boilers. Background technique [0002] The steam drum or steam-water separator, header, steam-water pipeline, desuperheater and other external pressure-bearing parts of the power plant boiler are characterized by a cylindrical shape, high working pressure, large size, and expensive cost. During the start-up, shutdown and load changes of power plant boilers, due to the uneven temperature distribution along the radial direction of the components, a relatively large transient low-cycle fatigue life loss will occur. If the control is not proper, the pressure-bearing parts outside the power plant boiler will be shortened service life. In the prior art, the online monitoring of the transient low-cycle fatigue life loss of the external pr...

AI Technical Summary

Problems solved by technology

[0002] The steam drum or steam-water separator, header, steam-water pipeline, desuperheater and other external pressure-bearing parts of the power plant boiler are characterized by a cylindrical shape, high working pressure, large size, and expensive cost

During the start-up, shutdown and load changes of power plant boilers, due to the uneven temperature distribution along the radial direction of the components, a relatively large transient low-cycle fatigue life loss will occur. If the control is not proper, the pressure-bearing parts outside the power plant boiler will be shortened service life

The existing technology cannot realize the online monitoring of the transient low cycle fatigue life loss of the external pressure parts of the power plant boiler

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