Cyclic hydrogen compressor shutdown
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In normal production, what should be done if the recycle hydrogen compressor stops suddenly? Those who are familiar with hydrorefining, please give some advice! Thanks first!
If the hydrogen circulation pump is driven by a turbine, after it stops operating, the only option is generally to release pressure in order to force the system to circulate again, thereby reducing pressure and temperature. In the case of reciprocating pumps, there is usually a backup unit available; simply turning on that backup unit will suffice~~~
What device? Reduce the feed rate, lower the load on the heating furnace, and shut down the heaters in order to lower the temperature at the reactor inlet and prevent excessive temperature rise in the bed; restore the recycle hydrogen compressor as soon as possible and increase the amount of fresh hydrogen supplied. It cannot be restored immediately; shut down the heating furnace, relieve pressure in the reaction system, isolate the reaction system, and initiate the distillation cycle
Stop feeding, purge with nitrogen, and relieve pressure.
Under normal circumstances, stopping the cyclohydrogen compressor will trigger a shutdown interlock, causing the feed pump, heater, and other equipment to stop operating. At the same time, an emergency pressure relief interlock is activated to control the bed temperature and prevent excessive temperature rise； In this case, the operator can close the relevant control valves, and at the same time use the exhaust hydrogen control valve to regulate the pressure release rate in order to prevent leaks. After that, the operator reactivates the device interlocks and starts the cycle hydrogen compressor promptly, thereby gradually resuming production.
The 3rd floor is correct; the original poster mentioned a hydroprocessing unit, which allows the system to be started immediately without any need for emergency pressure relief.
Is it sufficient to simply reduce the feed rate to shut down the cyclic hydrogen compressor? Doesn’t it need to be cut before feeding?
If the cyclic hydrogen compressor is shut down for more than 10 minutes, can we simply stop feeding material and reduce the load on the heater in order to lower the temperature at the reactor inlet? Won’t the temperature of the feed bed not rise if it’s not cut off?
After the circulation machine stops, it usually triggers interlocks for the feed pump and the heating furnace; on-site operators must ensure isolation of pressure leaks between high and low pressures, close the gas valves of the heating furnace burners, check the combustion status of the pilot lights, and the control room operators must maintain proper liquid levels in all tanks
Hydrocracking unit interlock logic setting: “Circulating hydrogen compressor stops” – start at 0.7 MPa/min – the new hydrogen compressor operates under no-load conditions; in such a situation, the compressor definitely needs to be stopped