If the hydrocracking feed pump stops operating, does it not trigger an automatic shutdown of the furnace?
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Why doesn’t our device have interlocking, while the one we’re studying does?
Our unit is equipped with a interlocked furnace shutdown system. The main purpose of shutting down the furnace is to stop supplying heat to the reactor after feeding to the reaction system is interrupted. If the circulating hydrogen continues to circulate at this time without shutting down the reactor, it will bring heat into the reactor, which could lead to a spike in temperature. Furthermore, due to the different heat absorption capacities of oil and hydrogen, failing to shut down the furnace may lead to excessively high temperatures in the furnace tubes, dry burning, and a loss of their strength.
The furnaces should be shut down in a sequential manner; if this is not done and the hydrogen feed pump stops operating, it will first lead to signs of coking in the furnace tubes, and secondly it will cause the temperature at the reactor inlet to rise rapidly, resulting in an increase in the temperature of the catalyst bed. In severe cases, this can lead to a sudden spike in temperature, which has an impact on the long-term usability of the catalysts.
When shutting down the furnace, the temperature at the reactor inlet is important as it determines the rate of cooling of the furnace. This is why the temperature difference between the inlet and outlet of the reaction furnace should be greater than 20 or 25 degrees, in order to ensure sufficient cooling effect. Without interlock, manually reducing the fuel gas may not be as timely as with an interlock in place. As for what the technician mentioned earlier about dry burning of the furnace tubes, if hydrogen is mixed behind the furnace, there should be no need for special concern.
Can’t the cold hydrogen be brought down? It’s so troublesome to restart the furnace; if only the raw material pump could start quickly
For safety reasons, interlocking is necessary; new installations must also have interlocking!
SIS interlock is essential; you can consult the design institute.
The stove needs to be turned off to prevent drying out； Interlock shuts off the pump outlet isolation valve to prevent an accident similar to the one that occurred at Jiujiang Petrochemical
How could it be troublesome? The interlock shutdown relates to the main burner; the pilot light functioning normally is quite expected, and recovery is also fast
A shutdown of the feed pump for our hydrorefining process will trigger a furnace shutdown interlock. If the furnace is not shut down, it may cause the reactor temperature to soar, leading to catalyst deactivation.
We have encountered this situation many times during production: the electric valve of the main burner closes, but it does not affect the pilot light! !