The PH of the boiler feed water is normal, but the pH of the boiler water is low
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What are the common causes? Is it necessary to measure the alkalinity of the boiler water?
What does it mean if the alkality of the boiler water is found to be low?
Low alkalinity is related to phosphate.
The reason is mostly due to the extremely high content of organic substances in the boiler feedwater; these organic substances decompose into organic acids under the high-temperature conditions of the boiler water, resulting in a low pH value of the boiler water. Therefore, it is necessary to address the issue of high organic substance levels in the boiler feedwater
We previously encountered the issue of high levels of organic matter in the water. Adding flocculants in the second pump room could only precipitate suspended solids and large-molecule organic substances; it was ineffective against short-chain organic compounds, resulting in excessive COD levels in the soft/deoxygenated water, which affected subsequent production processes. Solving this problem is simple: add an activated carbon filter before water treatment, after the mechanical filter, which can effectively prevent this issue from occurring.
Can we test the TOC of the feed water?
It is recommended that the original poster take a look at \"Questions and Answers on Boiler Water Treatment Technology\" (there are many such books on the forum; you might want to search for them)
Studying hard*…:):):):):):):):):):):)
The boiler should have sodium tripolyphosphate added to regulate the alkalinity of the boiler water
Trisodium phosphate can only regulate the phosphate and alkalinity levels in boiler water; it cannot control the pH value
Learning*, gaining knowledge – I’ve encountered that situation too; it’s caused by the water being treated with too many other substances