Are there any experts on corrosion of small-tonnage gas boilers in this forum?
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This post was last edited by Fan334 on 2018-2-26 at 10:11. Are there any experts on the forum who specialize in corrosion issues related to small-tonnage gas boilers? The boiler in our unit has suffered corrosion-induced perforation; we would like to have it determined what type of corrosion is responsible for this The previous photos
Has denitration been carried out inside the boiler?
Nothing was done? Was the boiler feed not deoxygenated? Does the city suffer from oxygen corrosion?
How large is this boiler? Steam or hot water boiler? Boiler feed water must be chemically treated demineralized water, and it should be deoxygenated; otherwise, it will cause corrosion in the water system.
4t, 1.6mp gas and steam boiler; the boiler feed water passes through a water softener, but there is no deoxygenation device. I measured the dissolved oxygen level in the softened water, and it was 9.6 mg/l
Oxygen removal is therefore necessary, with the oxygen content to be ≤0.05 mg/l.
This phenomenon is clearly oxygen corrosion. From your photos, it appears to be a WNS steam boiler, with corrosion occurring on the threaded smoke tubes on the water side. According to GB1576, an deaerator is recommended for boilers of 10 tons or more; however, it is also stated that if there is significant corrosion, a deaerator is necessary regardless of the boiler’s capacity. As for whether to use chemical or thermal deoxidation, you can decide based on the specific circumstances.
Mm-hmm, yes, a horizontal fully wet-back three-pass boiler