Boiler water quality
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For a 35-ton fluidized bed boiler, the quality of the boiler water is unsatisfactory: the pH level is low, and there is no phenol-alkali content. Adding trisodium phosphate had no effect. Then we added sodium hydroxide to the trisodium phosphate, and the pH level increased; however, after about ten hours, it dropped back to around 4.5. The phosphate concentration remained at 2, and there was still no phenol-alkali content. The pH level of the feed water also decreased by about 6.5. Adding trisodium phosphate again did not change these values; in particular, the phosphate concentration stayed at 2. What should be done? Solve
I need to find a solution urgently; this situation has lasted for several days now, and the water in the boiler remains acidic
Is the water quality of the deionized water satisfactory before it enters the deaerator? If all parameters are within the acceptable range and only the pH is low, it is possible to consider adding dilute ammonia solution to raise the pH.
The demineralized water is of satisfactory quality, and the deaerator is in good condition as well
Is dilute ammonia water added to the feed water? We added it; now we have raised the pH of the feed water, but the pH of the boiler water hasn’t changed. Moreover, the water color is slightly reddish. What we’re doing now is to increase the amount of wastewater discharged, then add chemicals, and repeat this process over and over again
A red color of the boiler water indicates corrosion inside the drum. If the pH of the feed water is between 8.8 and 9.3, but it drops after reaching the drum, it is necessary to conduct a thorough investigation. It is also important to check the quality of the water used for adding chemicals, as well as to analyze the pH levels before and after chemical addition
We add ammonia to adjust the pH before the softened water enters the deaerator, and sodium tripolyphosphate is added inside the steam drum. Strengthen water changing