In production, the term \"rapid temperature rise\" is often used; what rate of temperature increase constitutes a rapid temperature rise?

The flying temperature phenomenon refers to the situation in which a reactor is in an unstable operating state; when there are minor disturbances in the operating parameters, the temperature in certain areas of the reactor or throughout the entire reactor can rise significantly. Fly temperature is caused by the “multiphase” state of the reaction system under operating conditions, and it is largely resulting from the interaction between the heat of reaction and the heat transfer process. It often causes disruption to normal operation, and can even burn out the catalyst. It can be prevented through theoretical analysis. As for devices with different heating rates, various products exist. There are no specific regulations.

Fly-temperature is an uncontrolled accident phenomenon that occurs when the reaction temperature exceeds the sensitive point of the catalyst. For example, if the sensitive point (sensitive temperature) of a certain catalyst is 450°C, operating below this temperature will prevent temperature spikes (unless there are significant changes in the properties of the raw materials); a sudden increase in temperature in such cases is due to too rapid a rise in temperature. When the temperature approaches or just exceeds this value, one must keep a close eye on it; increase the temperature in increments of 1 degree, waiting for a while after each increase to see if there is any change in temperature. If no change occurs, then increase the temperature by another 1 degree and observe again. Feiwen has a significant turning point in its trend! Even at a temperature of 1000°C during flying temperature, the CAT will not be damaged; however, the firing temperature used in the production of the CAT is no problem. When heating up, the pressure must be completely released (no hydrogen should remain) and nitrogen must be used for purging.

Hello, besides the Fiewin phenomenon, in what other situations can it occur?

It occurs during the start-up of new production lines when cat vulcanization is carried out; it appears when the raw materials contain a high amount of water, or when there are significant changes in the properties of the raw materials. It can occur both when feeding materials at the start of operation and when shutting down the process. As long as overheating occurs, it is an uncontrollable accident that requires rapid pressure relief~

In my understanding, when the temperature exceeds the normal range, it is referred to as overheating, and this can be brought back to normal through proper manual adjustments. If the temperature rises too rapidly and becomes too high to be brought back under control using normal methods, unconventional measures such as shutting down or partially shutting down the operation are required to address the issue; this is what is referred to as a temperature spike. Purely my personal understanding; for reference only

Flight temperature is not the rate of “temperature increase”. From a reaction mechanism perspective, once this temperature is exceeded, the reaction process can no longer maintain a constant temperature, and the temperature continues to rise without stopping.