After the main catalyst cracking air system is put into automatic operation, what tasks do the operators on-site and those in the control room need to carry out?

1# lcw27149 Operator: 1 Quickly activate main air automatic protection, differential pressure protection for the two devices, and feed automatic protection； 2. Inside the chamber, change the pressure control for reverse 103 to manual (double-acting slide valve) with full closure, and change the pressure control for reverse 102 to manual (full-open butterfly valve). Open the flare control valve at the compressor inlet; if necessary, open the on-site bypass valve to maintain a negative pressure difference between the two vessels. 3 The indoor standby slide valve, regeneration slide valve, reaction feed valve, as well as the oil slurry reprocessing and cooled gasoline valves should be manually shut off. Assistant operator: 1. Go to the site immediately and shut down valves one and two, then the main air valve ； 2. Close the main feed valve for the reaction process, and open the emergency return line ； Close the cooling gasoline manual valve and the lift pipe water injection valve at stage 3, and introduce emergency steam ； 4. Check the regenerative slide valve to ensure it is fully closed; 5. Turn off the steam used for protecting the combustion oil, and close the manual valve for injecting the passivator ；

The most important thing is to stay calm and follow the instructions step by step

Reaction operator: Control the system pressure by using a flare to prevent oil and gas from mixing in the reaction and regeneration systems, while also managing the steam system properly. External reaction operation: Verify on-site the operation of the system’s self-protection valves, and close all wall valves leading to the oil systems in the lift pipe. Light the start-up heater depending on the condition of the main fan. At the same time, evacuate or depressurize the catalyst tank. Internal operation for distillation stabilization: Maintain normal system circulation; since there is no feed material, control the temperature at the top of the tower in advance to ensure the liquid level at the bottom of the tower ； The absorption and stabilization system maintains pressure in the system cycle, with all materials being discharged intermittently based on actual conditions. External operation of the three units: On-site verification of the self-protection function of the main fan’s outlet valve, preliminary determination of the cause of the accident, as well as tasks such as turning the turbines and draining steam.

The main operator first checks the operation of the slide valves following the self-protection action, ensuring proper control of the reaction pressure. The assistant operator checks the operation of the slide valves, as well as the status of the emergency bypass and the injection of emergency steam; he also closes the first-stage manual valve and the passivator

The main operator first checks the operation of the slide valves following the self-protection action, ensuring proper control of the reaction pressure. The assistant operator checks the operation of the slide valves, as well as the status of the emergency bypass and the injection of emergency steam; he also closes the first-stage manual valve and the passivator

1. Initiate the main air self-protection action, and go to the site to check whether the respective self-protection valves have activated; if not, shut off the main air damping check valve and the pressurized air damping check valve to cut off the supply of air. Open the main steam emergency bypass line, pressurized air emergency steam bypass line, feedstock emergency steam bypass line, and upper/lower feed emergency bypass valve lines; close the hand valves for raw material, slurry, crude gasoline, and terminator feed to the lift pipe nozzles, and arrange for the slurry to be discharged. 2. Shut down the external heat exchanger, close the medium-pressure steam grid connection valve (vent 3–5 turns, with a pressure of not less than 0.5 MPa), maintain water circulation, and divert the flue gas to a bypass route. 3. If the main wind cannot be restored immediately, minimize the amount of steam introduced as a result of the main wind failure in order to maintain the bed temperature, so that burning oil can be injected promptly once the main wind is restored. 4. In the event of a long-term shutdown of the main air supply, treat it as a case of a blocked bed. Copied here; hope it’s useful to you.

After performing the anti-regeneration self-protection action, it is necessary to shut off the two devices related to anti-regeneration, close the wall valves controlling the feed to the lift pipe, increase the amount of emergency steam supplied to the lift pipe, and ensure that the reaction pressure remains higher than the regeneration pressure. Is it possible to avoid using a flare at the inlet of the rich gas compressor by activating the anti-surge mechanism and keeping the compressor running at low speed? In other words, how can an emergency shutdown be carried out without using a flare? Please provide guidance, experts. Thank you!

This post was last edited by FloatHead on 2009-11-22 at 23:29. The operator confirmed that the self-protection system was in operation; in the control room, the valves that needed to be opened or closed were manually checked again to maintain a stable differential pressure between the two vessels, thereby ensuring safety and reducing the amount of raw material entering the plant. The dispatch team was also contacted. Verify the self-protection actions on-site during outdoor operations, and correct any errors immediately. Manually shut down all feeders. Stop the feed pump, etc. There are too many to mention in detail; each different setup has its own unique features. The main principle is to prevent catalyst backflow.