Thermal purging after long-term shutdown for sulfuric acid production
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Sulfur-based acid production: hot blowing operations after a long shutdown? Purpose? Qualification standards? Precautions?
This post was last edited by mkp369 on 2018-3-6 at 16:00. The purpose of performing hot blowing during prolonged shutdowns is, 1) to remove sulfur dioxide and sulfur trioxide gases from the system, especially from the catalyst, and 2) to shorten the shutdown time. The acceptable standard is SO2+SO3 less than 0.03%. It is important to control the cooling rate properly
Hehe, for long-term parking, it can’t hurt to expose it to more wind!
This post was last edited by mkp369 on 2018-3-6 16:01. Okay, thank you! That hot air blowing is mainly used to cool the equipment and remove SO2 and SO3 gases from the system. Our acceptance criterion for hot blowing is SO2+SO3 in the exhaust gas at the four outlets
In some units, the heating time is too short (insufficient heating), resulting in the porcelain balls at the bottom cracking, and the catalyst at the bottom becoming scarred and turning green
The catalyst purge temperature is maintained above 400 degrees until the exhaust emissions are below 30 ppm; the lower the exhaust levels, the better, indicating that the purge has effectively cleaned the catalyst