Request for diesel hydrogenation hydrogen interruption plan

This depends on the requirements of each factory. For short periods, it involves simply turning off the fire to allow cooling and stopping feedstock supply; the reaction temperature drops rapidly, the main burner in the furnace is turned off, feedstock supply is halted, the distillation system and the reaction system are switched to circulation mode, and the desulfurization system is stopped. Stop the new hydrogen compressor; allow all of the circulating hydrogen to circulate. If this process takes too long and there is no source of hydrogen available, proceed with an emergency shutdown. Ensure proper control of the high-pressure liquid level and pressure

Some units are seeing a reduction in temperature and volume of feed; I’m not in favor of continuing to feed material under such conditions. However, if it can be restored in a short time, then it’s possible to proceed

Universal template: Handling of accidents involving the shutdown of fresh hydrogen supply during hydrotreatment (1) Accident symptoms: – The flow rate of fresh hydrogen coming from outside the plant, FI12602, decreases rapidly； —The new hydrogen pressure PIC12601 has increased ； —The top pressure in the circulating hydrogen inlet separator tank D108 is gradually decreasing ； —The outlet flow rate FI12502 of the new hydrogen compressor indicates zero ； —The new hydrogen compressor control system CCS and the SIS control system issue audible and visual alarms for shutdown. (2) Steps for handling outdoor operation accidents: 1. Identify the cause of the shutdown; once the fault is resolved, start the machine immediately. If it cannot be started, a backup unit can be activated. The faulty unit should be contacted by the relevant parties to have it repaired as soon as possible and restored to a standby state. 2. During the process of reducing temperature and flow rate, adjust the combustion conditions of heater F-101 in a timely manner according to the operational requirements; when the main burners are turned off, the corresponding fuel gas valve should be closed promptly. 3. When the average temperature of the reaction catalyst bed (CAT) drops to 360°C, reduce the valve controlling the flow of tail oil from the bottom of the distillation tower, and gradually open the long-circulation valve for the tail oil in order to direct it to the raw material buffer tank D-101. Contact the dispatch team to reduce the amount of fresh wax oil fed to the vacuum distillation unit until supply is cut off, and the field operator shall close the valve for feeding raw material into the unit. 4. Close the inlet and outlet valves of the two new hydrogen compressors, and confirm that the auxiliary oil pump is operating properly. The system pressure is released to the vent main. 5. If the amount of fresh hydrogen cannot be restored for an extended period, as the pressure in the reaction system decreases, the system will be shut down completely following the standard shutdown procedures until the pressure drops to 4.0 MPa; at that point, the feed to the reaction will be stopped while the recycle hydrogen circulation will continue. 6. Redirect the naphtha and diesel streams to the reject line, and close the manual valve for the product outlet. 7. When the mid-section reflux cannot be maintained, stop the mid-section reflux pumps P-207A/B and the diesel pump P-205 ； When the reflux from the hydrogen sulfide stripping tower and the distillation tower cannot be maintained, first stop the corrosion inhibitor pumps P-208A/B, and then stop the reflux pumps of the hydrogen sulfide stripping tower P-201A/B and those of the distillation tower P-204A/B. 8. As the temperature of the heat source decreases, switch the 0.5 MPa and 1.0 MPa steam supplied to the convection section of the distillation heater to vent mode, and close the valves in the steam supply pipeline to ensure that there is fluid flow in the convection section of the heater. 9. Close the stripping steam control valve FV20102 for C-201, and the stripping steam control valve FV20402 for C-202. 10. Maintain the liquid level and pressure in the low-pressure gas desulfurization tower, ensure the circulation of the MDEA solution; adjust the opening degree of FV30101 to control the flow rate of the lean amine solution based on the amount of feed gas in the desulfurization system, thereby regulating the circulation volume of the MDEA solution. Change the position numbers by yourself; the names remain basically the same

Are there any standards for temperature and rainfall reduction?

There are standards for this; it’s just that different organizations have different designs, so it’s difficult to give a specific answer – hence only principles are provided. Thank you, Leader Bu. Wishing you rapid promotion