On-line monitoring device and method of stress intensity of pressure-containing member outside station boiler

Abstract

The invention provides on-line monitoring device and method of the stress intensity of a pressure-containing member outside a station boiler. The device comprises a stress intensity calculating server which is connected with a station boiler decentralized control device through a factory level monitoring information device. The method comprises the steps of: reading the data of on-line monitored points of the station boiler, calculating the thermal stress of the pressure-containing member outside the station boiler; calculating the mechanical stress of the pressure-containing member outside the station boiler, which is caused by working medium pressure; calculating the combined stress of the pressure-containing member outside the station boiler; calculating the stress intensity monitoringvalue of the pressure-containing member outside the station boiler; determining the yield limit of materials at a working wall temperature; calculating the relative stress intensity of the pressure-containing member outside the station boiler on line; determining the maximum relative stress intensity of the pressure-containing member outside the station boiler; and controlling the stress intensity of the pressure-containing member outside the station boiler. The invention realizes on-line calculation and control on the stress intensity of the pressure-containing member outside the station boiler.

Description

technical field [0001] The invention relates to an online monitoring device and method for the stress intensity of a pressure-bearing part outside a power station boiler, and belongs to the technical field of power station boilers. Background technique [0002] In the operation of power plant boilers, in addition to bearing the mechanical stress caused by the pressure of steam or water, the steam drum or steam-water separator, header, steam-water pipes and desuperheater of the power plant boiler have external pressure-bearing components in the boiler. During start-up, shutdown or load change, relatively large thermal stress is generated due to uneven temperature distribution along the radial direction of the pressure-bearing parts, which will lead to changes in the stress intensity of the pressure-bearing parts outside the power plant boiler furnace. If the control is not proper, the power plant will be shortened The service life of the pressure-bearing parts outside the boi...

AI Technical Summary

Problems solved by technology

[0002] In the operation of power plant boilers, in addition to bearing the mechanical stress caused by the pressure of steam or water, the steam drum or steam-water separator, header, steam-water pipes and desuperheater of the power plant boiler have external pressure-bearing components in the boiler. During start-up, shutdown or load change, relatively large thermal stress is generated due to uneven temperature distribution along the radial direction of the pressure-bearing parts, which will lead to changes in the stress intensity of the pressure-bearing parts outside the power plant boiler furnace. If the control is not proper, the power plant will be shortened The service life of pressure-bearing parts outside the boiler furnace

The existing technology cannot realize the monitoring and control of the stress intensity of the external pressure parts of the power plant boiler.

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