Device and method for online corrosion measurement during chemical cleaning of boiler tube

Abstract

The invention relates to a device for online corrosion measurement during chemical cleaning of a boiler tube. The device comprises a first measurement device and a second measurement device, wherein the first measurement device and the second measurement device each comprise a plurality of insulation rings, at least one annular electrode, and a U-shaped metal tube; the insulation rings and the corresponding annular electrode are arranged in a spaced manner and fixedly and hermetically connected to form each communicated tubular measurement device; the two ends of each tubular measurement device are connected with the boiler tube to be cleaned through flanges; a through hole is formed in the side wall of one insulation ring in each tubular measurement device; one end of each metal tube is communicated with the corresponding through hole, and a reference electrode is arranged at the other end of each metal tube; the annular electrode in the first measurement device is made of the boilertube to be cleaned; and the annular electrode in the second measurement device is made of a boiler tube without scale, of which the material is the same as that of the boiler tube to be cleaned. The device provided by the invention has the advantages that the boiler tube to be cleaned is used as the measurement electrode, so that an electrode cleaning progress is identical to a boiler tube cleaning progress; and through the comparison measurement device, that is, the boiler tube without the scale in the second annular electrode, the time at which the scale is completely cleaned off can be accurately judged.

Description

technical field [0001] The invention relates to a detection device and method, in particular to an on-line corrosion measurement device and method in the chemical cleaning process of a power plant boiler. Background technique [0002] Boiler tubes used in power stations will form oxide layers on the inner and outer heating surfaces after long-term use, that is, scaling, which affects the thermal efficiency of the boiler. Regular chemical cleaning methods are required to remove scaling. At present, electrochemical corrosion potential ECP monitoring technology, electrochemical impedance spectroscopy monitoring technology, electrochemical noise monitoring technology and resistance probe monitoring technology to monitor the cleaning process, but none of the above methods can accurately judge whether the scale is properly cleaned, resulting in the early or late end of the cleaning process , there is incomplete cleaning of fouling or corrosion of boiler tubes. Contents of the in...

AI Technical Summary

Problems solved by technology

[0002] Boiler tubes used in power stations will form an oxide layer on the inner and outer heating surfaces after long-term use, that is, scaling, which affects the thermal efficiency of the boiler. Regular chemical cleaning methods are required to remove scaling. At present, electrochemical corrosion potential ECP can be used monitoring technology, electrochemical impedance spectroscopy monitoring technology, electrochemical noise monitoring technology and resistance probe monitoring technology to monitor the cleaning process, but none of the above methods can accurately judge whether the scale is properly cleaned, resulting in the early or late end of the cleaning process , there is incomplete cleaning of scale deposits or corrosion of boiler tubes

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