Online life assessment system and method of thermal power plant steam pipeline

Abstract

The invention relates to an online life assessment system and method of a thermal power plant steam pipeline. The system comprises a utility boiler, a low pressure cylinder, an electric generator, anintermediate pressure cylinder, a high pressure cylinder and a computer; the life of the steam pipeline can be assessed online as required, the metal technical supervisory means is enriched, and meanwhile, improvement on the running security of the generator is facilitated; preliminary life assessment can be performed and risk pre-warning can be performed on the basis of not damaging the existingsteam pipeline; a great deal of temperature and pressure data are recorded and analyzed, and combined with large and small corrected metal detection data and microstructural detection results, and thus deformation-fatigue life assessment is achieved via a rebuilt algorithm preset in the computer. According to the system and method provided by the invention, manpower resource liberation and a greatdeal of metal detection work are achieved by combining with the actual steam pipeline life assessment, and meanwhile, the pipeline sampling economic losses without purposes and within a large range are avoided, so that the system and method have good economic benefits and social benefits, and the problem in present high-temperature high-pressure metal key life assessment is solved.

Description

technical field [0001] The invention relates to an online life evaluation system and method for a steam pipeline in a thermal power plant. Background technique [0002] At present, the DCS system of domestic thermal power units mainly focuses on the parameters and operating conditions of the medium in the steam pipeline, and performs real-time monitoring of steam temperature, pressure, flow, etc., which mainly stays at the system level. There is no monitoring method for the material status of the equipment layer, especially the basic equipment. It mainly relies on professionals to conduct on-site inspections to find out whether there are problems, which results in untimely and incomplete feedback of material status. At the same time, as the operating time of the unit increases, in the long-term high temperature and high pressure operating environment, the steam pipeline will suffer from creep damage, and the microstructure will prolong and change with time, such as the Chine...

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Problems solved by technology

[0010] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and provide a reasonably designed system for on-line life evaluation of steam pipelines in thermal power plants, which can not only solve the problems that cannot be evaluated in time, but also can be used according to changes in steam parameters. According to the running time corresponding to different stages, the online life evaluation of steam pipelines is carried out according to the needs

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