Method for determining high-temperature corrosion of boiler water-cooled wall through adherent gas components

Abstract

The invention discloses a method for determining high-temperature corrosion of a boiler water-cooled wall through adherent gas components . The method comprises the following steps: (1), opening smallholes in fins between boiler water cooled wall tubes to install adherent atmosphere measuring points; (2), extracting flue gas near the water-cooled wall through an adherent atmosphere measuring hole, and storing the flue gas by using a gas sampling bag; (3), measuring the adherent atmosphere (mainly including O2, CO and H2S) of the water-cooled wall by using a flue gas component analyzer according to an electrochemical method or an infrared method; and (4), performing determination and analysis according to the basis of high-temperature corrosion of the boiler water cooled wall. According tothe invention, the implementation method is simple, convenient to operate and clear in judgment standard; most of existing thermal power generating units can be implemented under existing conditions;and effective detection and evaluation means can be provided for regular detection of the high-temperature corrosion condition of the water-cooled wall of a coal-fired boiler.

Description

technical field [0001] The invention belongs to the high-temperature corrosion prevention technology of a water-cooled wall of a coal-fired boiler, and in particular relates to a method for discriminating high-temperature corrosion of a water-cooled wall of a boiler through gas components attached to the wall. Background technique [0002] The high-temperature corrosion of coal-fired boilers is generally divided into the following types: coal ash-type high-temperature corrosion, sulfate-type high-temperature corrosion, sulfide-type high-temperature corrosion, chloride-type high-temperature corrosion, hydrogen sulfide-type high-temperature corrosion, by reducing atmosphere Caused by high temperature corrosion, etc. [0003] With the continuous improvement of domestic coal-fired boiler emission control requirements for nitrogen oxides, most coal-fired boilers have adopted low-nitrogen combustion technology with deep air classification to achieve low NO x emission. However, u...

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Problems solved by technology

[0020] At present, there is still no unified standard method for the identification of high-temperature corrosion of boiler water-cooled walls in China, which is not conducive to the judgment, analysis and research of common boiler water-cooled wall high-temperature corrosion problems. Therefore, a feasible and reliable high-temperature corrosion identification of boiler water-cooled walls Method Facilitates Evaluation of Boiler Operational Safety

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