The circulating water contains free chlorine
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The main circulating water pipeline of the caustic soda system contains free chlorine. Checks have shown no leaks in the heat exchangers used for the circulating water; what other factors could possibly cause free chlorine to be present in the circulating water?
It must have been brought in by speculative fungicides
Have you replaced the disinfectant you are using? If free chlorine has never been detected in the circulating water up to now, then it shouldn’t be a problem related to disinfectants. The sudden appearance of free chlorine in the circulating water is not a trivial matter; it’s necessary to ensure that there are no issues with the heat exchanger. (Otherwise, it could only be due to an accidental leak of chlorine gas into the cooling tower.) . . . . It happened once at my company before; this is a bit too coincidental)
If liquid chlorine or sodium hypochlorite is used for sterilizing the circulating water, it is reasonable to have a certain amount of free chlorine in the water. But if chlorine gas or sodium hypochlorite is not used for disinfection, it is necessary to determine the source of free chlorine. Because a leak in a small chlorine heat exchanger can lead to serious accidents. Since the operating pressure of the chlorine cooler is not high, if the circulation pressure is too high and there are leaks in the heat exchange process, water can flow back into the chlorine, which could lead to serious accidents.
To prevent the growth of algae and fungi, trace amounts of chlorine, sodium hypochlorite, etc., are added to circulating water; as a result, all such water contains less than 1 mg/l of free chlorine
If the free chlorine level continues to increase, a leak in the heat exchanger should be identified
Chloride levels should be normal, but they shouldn’t exceed the limit. What are your current levels?