【概要描述】Waste heat boilers, during which the boiler is out of service, can corrode if the correct anti-corrosion measures are not applied. Corrosion is extremely harmful to waste heat boilers, so it is of great significance to prevent corrosion of the steam and water system for safe operation.
In addition to the regular wear and tear of many pieces of equipment in use, they are more likely to be damaged when left unused. Waste heat boilers, for example, can corrode if the correct anti-corrosion measures are not applied during the time the boiler is out of service. Corrosion is extremely harmful to waste heat boilers, so the prevention of corrosion in the steam system is of great significance to safe operation.
Acid dew point corrosion and dissolved oxygen corrosion are usually the cause of corrosion in waste heat boilers after shutdown. Acid dew point corrosion refers to the flue gas into the waste heat boiler contains sulfur dioxide into sulfur trioxide combined with water to generate sulfuric acid, when the boiler heating surface is lower than the sulfuric acid dew point, which leads to sulfuric acid condensation on the tube wall and the metal tube wall chemical reaction and electrical reaction led to the waste heat boiler is corroded, the formation of ulcer-like surface or even perforation; dissolved oxygen corrosion refers to the boiler out of service, the outside air will be a large number of waste heat boiler water into the System, although the boiler has been released, but in the boiler metal surface is always attached to a layer of water film, the oxygen in the air will be dissolved in this water film, so as to reach a saturated state, so it is easy to cause dissolved oxygen corrosion, the corrosion rate is generally much faster than during operation. If the boiler metal surface can be dissolved in the water film of salt scale, the corrosion is more intense.
Therefore, the use of appropriate protection methods during the shutdown of the waste heat boiler, to prevent boiler corrosion, to ensure safe operation and extend the service life of the boiler has important significance.
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Tan Tou Industrial Zone, Guijiao Avenue, Guicheng, Nanhai District, Foshan City, Guangdong Province
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