How to address the corrosion of ND steel heat exchange tubes in low-temperature, humid flue gas?
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The image above shows the heat pipes used in a GGH within wet flue gas at low temperatures (60–90°C) in a certain boiler; they were discarded after less than a year of use. ND steel and 09CrCuSb steel are recommended materials for coal-fired boilers, flue pipes, chimneys, boiler air preheaters, and economizers. However, the service life is short due to corrosion in such an environment, which limits the use of GGH. How to address surface corrosion of heat pipes is crucial for enabling GGH to function in flue gas; what methods are the best to use?
Fluoroplastic-steel composite pipes can be considered for use