Chloride content in boiler water
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I’m not quite sure, so I’d like to know: what is the main purpose of controlling the chloride ion content in the boiler water in waste heat boilers? What are the consequences of high chloride ion levels?
High chloride ion levels can cause boiler corrosion
The main purpose of controlling the chloride ion content in the boiler water of waste heat boilers is to reduce corrosion of the boilers. The consequence of high chloride ion levels is that the presence of chloride ions in the water can accelerate the corrosion rate of boilers. This type of corrosion is usually localized, and it poses a significant threat to the boilers, affecting their normal operation
Chloride ions are easily adsorbed by metal surfaces and displace oxygen from the oxide film, forming soluble chlorides that accelerate the corrosion of the metal
So, how much does this chloride ion actually control? At what level will it have an impact! ! ! ! ?
High chloride levels primarily cause stress corrosion in the equipment, which then leads to leaks, a very serious issue.
At what level of chloride ions does corrosion occur in equipment?
The lower the chloride ions, the better; for feedwater in medium-pressure boilers, activated carbon is generally used for chlorine removal, which is sufficient to meet the requirements. Our company requires that the chloride ion level in the water be less than 5 mg/l.
This post was last edited by yuchenchf on 2014-5-10 09:56. Activated carbon cannot remove chloride ions; it can only reduce the amount of residual chlorine. To lower the chloride levels in boilers, adsorbents can be used, which helps achieve energy savings and emission reduction
There is no clear standard; some sources recommend less than 3 mg/L
Our requirement for residual metals is <25ppm