Steam turbine low-pressure through-flow area safety monitoring and prewarning system and working method

Abstract

The invention discloses a steam turbine low-pressure through-flow area safety monitoring and prewarning system and a working method. Data is acquired through a flow area air blowing monitoring module,a long blade vibration monitoring module, a blade water erosion water brush prewarning module and an optimal operation boundary adjusting module; and after intercommunication, target unit safety boundary data and optimal safety operation boundary are generated in a safety estimating module and the optimal operation boundary adjusting module to prompt safe and economical adjustment of an unit. Themethod is suitable for steam turbine low-pressure through-flow area safety monitoring and prewarning in operation of a deep peak adjusting unit under part-load working condition, can accurately, comprehensively and effectively predict the low-pressure through-flow area long blade air blowing critical steam inlet flow and the air blowing high-temperature area position in deep peak adjustment, canfinely monitor the long blade vibration stress peak magnitude, can prospect and prewarn the water erosion state of final-stage blades, and achieves further optimization to give the safety operation boundary to the unit.

Description

technical field [0001] The invention belongs to the field of steam turbine power generation, and in particular relates to a safety monitoring and early warning system and working method for a low-pressure flow area of ​​a steam turbine. Background technique [0002] At present, affected by factors such as power peak regulation, thermal power steam turbine units often operate under partial load conditions. As the load rate of the unit decreases, the steam inlet parameters of the low-pressure cylinder of the steam turbine decrease accordingly, and the volumetric flow rate is greatly reduced. The research shows that when the unit operates under the condition of small volume flow, there are mainly safety problems such as blowing in the low-pressure flow area, fluttering of the last stage blade, water erosion damage on the steam outlet side and the steam inlet side, etc. [0003] Therefore, it is necessary to accurately evaluate and monitor the low-pressure flow area of ​​the st...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned shortcomings, and provide a safety monitoring and early warning system and working method for the low-pressure flow area of ​​the steam turbine, aiming at solving the problem of Especially the safety monitoring and early warning issues in the operating state of small volume flow

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