What are the common measures taken by hydrogenation units/other units to address excessive temperature rise?
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What are the common measures used by hydrogenation units to address excessive temperature rise in reaction vessels? I’ve seen many designs that draw on foreign rapid pressure relief systems, using 7/14 bar for pressure release. Are there any other methods used in the devices you’ve come across? Can this pressure relief system be replaced with a safety valve from fire-fighting equipment?
During hydrogenation overheating, the chilled brine is usually turned on fully, the feed is stopped, and pressure relief is prepared; the safety valve serves as the final safeguard
After the hydrogenation temperature rises excessively, no major adjustments are needed; it is sufficient to reduce the heat input to the furnace – if that doesn’t work, turn it off completely. At the same time, increase the amount of cold hydrogen to ensure there is flow of fluid within the bed, thereby allowing the temperature to be reduced in the reactor. In simple terms, it involves reducing heat intake in order to disrupt this exothermic reaction and facilitate the removal of heat. If that still doesn’t work, then relieve the pressure until there is no temperature rise anymore. But if the temperature rise occurs again after relieving the pressure? Fill it with nitrogen from the compressor tank. For highly exothermic reactions, it is sufficient to interrupt the exothermic reaction process; for example, if two certain reactions are exothermic, one of the feed routes should be cut off. Without feed, those reactions will stop occurring, and by reducing the load on the heating furnace, the situation should be under control. Micro-exothermic reactions generally do not experience temperature spikes; if the temperature rises, reducing the heat input will resolve the issue. I did it based on my own understanding; please let me know if there are any mistakes. Thank you