Start-up of catalytic reaction with dilute phase and excessive temperature
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In the catalytic reaction unit, a severe temperature rise occurs in the dilute phase when combustion oil is injected at startup; what measures can be taken to keep the temperature of the dilute phase from rising too high?
What causes severe overheating in the dilute phase? Our catalytic devices have not been observed.
Excessive spraying or too large a quantity of fuel for combustion can cause afterburning. :lol
Just turn on the nozzle slowly; it’s not difficult at all
Generally, overheating is the result of incomplete combustion; this can be addressed by adjusting the fuel injection, changing the air flow rate, or slowing down the feed rate. As a last resort, an oxidizer must be used to help regulate the temperature and ensure the safe operation of the equipment.
Gradually increase the amount of fuel used for combustion; pay attention to maintaining a high oxygen level, and increase the main air flow as needed
This issue depends on the type of catalyst being used. In the case of oxygen-deficient conditions, post-injection combustion occurs due to an increase in coking, and we generally increase the amount of fuel used for combustion; once the lean-phase temperature returns to normal, we gradually reduce that fuel amount. As the compressor’s load increases, we gradually enlarge the nozzle size before again reducing the fuel amount used for combustion. If the overheating occurs during the startup of the oxygen-enriched regeneration unit, it’s sufficient to have the operators add an oxidizing agent.
This issue depends on the type of catalyst being used. In the case of oxygen-deficient conditions, post-injection combustion occurs due to an increase in coking, and we generally increase the amount of fuel used for combustion; once the lean-phase temperature returns to normal, we gradually reduce that fuel amount. As the compressor’s load increases, we gradually enlarge the nozzle size before again reducing the fuel amount used for combustion. If the overheating occurs during the startup of the oxygen-enriched regeneration unit, it’s sufficient to have the operators add an oxidizing agent.