Acetylene hydrogenation reactor
Thread Content
In the olefin separation process, when an over-temperature interlock occurs in the acetylene hydrogenation reactor, the inlet and outlet isolation valves are closed, the hydrogen isolation valve is closed, and the emergency vent valve is opened (the vent valve is shut down by interlock when the outlet pressure drops too low during venting). What is the purpose of the low-pressure interlock in shutting down the vent valve, and what is the significance of this interlock setting?
Keeping the pressure low is also to protect the reactor; too low a pressure, or even a vacuum condition, can damage the container
Is it to prevent equilibrium with the pressure in the flare system during venting, and to stop impure gases from the flare from entering the reactor and affecting the catalyst’s activity? Or maintain positive pressure in the reactor to prevent negative pressure from developing during cooling! ! I’m not sure, am I? Hehe!
It makes some sense; I’m fairly in favor of using negative pressure.
Personal analysis: The main cause of overheating in the adiabatic bed is a low space velocity. By shutting off the feed and using the flare to increase the space velocity, the temperature of the bed layer is reduced, thereby eliminating the overheating issue. To save ethylene, the use of the flare is minimized; for this reason, a low-pressure switch is installed to shut down the venting.
The interlock mechanism is in place for safety reasons; what you mention about reducing losses doesn’t seem very reasonable.