Reasons for high pH value of boiler feedwater and its adjustment
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Our company has a 10-t, 1.25MPa gas boiler; trisodium phosphate is used to adjust the boiler water, and the phosphate level meets the requirements, with a pH value greater than 12. The indicators of the feed water desalinated water are within acceptable limits, but the cause cannot be identified after prolonged investigation. Could you please advise on possible reasons? We have changed to using sodium dihydrogen phosphate to adjust the boiler water, and the parameters are within the acceptable range. I would like to ask whether it is better to use sodium dihydrogen phosphate or disodium hydrogen phosphate Why?
Possible problems: 1. The laboratory analysts lack a strong sense of responsibility and fill in the data carelessly； 2. Malfunctions of laboratory analysis instruments ； 3. Incorrect sampling location ； 4. The sampling bottle was not cleaned properly
The other results are normal; as for the PH issue, try various methods on your own
Then it can’t be a strong alkali; how is that possible? Some samples can be sent to the local quality supervision agency for verification, and that will clarify things.