Method for avoiding overheat tube burst in tubular boiler of power station boiler

Abstract

The invention relates to a method for avoiding overheat tube burst in a tubular boiler of a power station boiler, belonging to the technical field of power station boilers. The method comprises the following steps: selecting representative tubes from a nest of tubes to install measurement acquisition points of temperature of an outer wall of the boiler; reading data from a power plant real-time database, and storing the data in a relational database of a local server; dynamically calculating the generation thicknesses of scale cinder in tubes of overheater and reheater in real time; separating out data of metal tube sections of parts exceeding metal stress strength overtemperature values of tube walls from calculated results and storing the data in an overtemperature summarizing database; and according to calculated inner wall working medium boundary layer temperature, metal inner wall oxidation aggravation temperature margin and real-time generation thickness of scale cinder in the tubes, automatically generating a visual distribution graph according to sequence. The method provided by the invention can accurately give out a tube burst early warning of the power station boiler, and preset measurements can be taken to avoid great direct financial losses to enterprises and nation caused by tube burst of the power station boiler.

Description

technical field [0001] The invention relates to a method in the technical field of power plant boilers, in particular to a method for avoiding overtemperature tube explosion in a tube system furnace of a power plant boiler. Background technique [0002] In recent years, with the rapid development of my country's power generation industry, a large number of supercritical and ultra-supercritical generating units have been put into operation, and parameters such as boiler grade, temperature, and pressure have been improved. At present, the highest temperature resistance level has been used for metal materials, and the corresponding material stress overtemperature margin is getting smaller and smaller. Many factors will cause overtemperature phenomenon during operation, and also cause the formation of oxide scale in the tube due to material overtemperature. And fall off to cause problems such as blocking the squib. Boiler tube burst accidents will not only cause tens of million...

AI Technical Summary

Problems solved by technology

[0010] The disadvantages of this patent are: (1) As stated in the subject of the patent application, it only performs intelligent wall temperature management on the two tube groups of the final stage superheater and the final stage reheater of the utility boiler, while the large capacity boiler The superheater recooker piping system has 6 tube groups in total, namely the first-stage superheater (or low-temperature superheater), the second-stage superheater (or partition screen superheater), and the third-stage superheater (rear screen superheater). ), four-stage superheater (ie final stage superheater), low-temperature reheater and high-temperature reheater

[0013] First of all, the application range of this technology is very limited. It only detects the amount of scale accumulation in the pipe that has been formed, and there is no technical measure to slow down the scale formation.

Secondly, this technology cannot realize online dynamic monitoring

Third, this technology cannot detect martensitic steel pipes

(2) There is no accurate calculation of the full coverage of the steam temperature and wall temperature of each calculated tube section in all tube furnaces in a tube group, and it is impossible to monitor the rate and thickness of the oxide skin on the inner wall of each tube

[0017] The scope of application of this technology is very limited. It only quantitatively detects the oxide scale in the tube on the out-of-service boiler, and does not monitor the scale in the tube of the boiler in operation.

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