Abnormal noise from the centrifugal blower used in sulfur-based acid production, with a feeling of sudden braking
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Dear senior teachers and colleagues, regarding the centrifugal blowers of model All1400/1.38 used in sulfuric acid production, abnormal noises occur during normal operation – three to five times a day, lasting one or two seconds each time. The sound is similar to that of brakes, and there are sudden increases or decreases in current; the pressure at the outlet of the blower drops instantly, and vibration increases. A few days ago, the modules and boards in the frequency converter were replaced (it’s not clear exactly which ones), but the problem persisted, with the abnormal noises continuing. It stopped once. I’m seeking help from all the teachers to answer my questions
The equipment and fittings at the fan inlet, as well as the fan impeller, should be checked
For sulfur-based acid production fans, exposure to humid air can lead to the formation of dilute acid, which corrodes the ring seals; when these seals fail, friction between them and the impeller can cause problems. It would be beneficial to have spectrogram data available, as this would allow for a more thorough analysis of the causes of such issues.