On the issue of water/steam injection into the flue gas at the outlet of the regenerator in catalytic cracking units to prevent overheating
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As the title suggests, in the design of my unit, I have installed water injection (desalinated water) and 1.0 MPa steam at the flue gas outlet of the regenerator to prevent the flue gas from overheating. I would like to ask for everyone’s opinions on the following: 1. Does your company use this approach? 2. Determine how frequently this process should be activated; in my opinion, it should not operate under normal conditions, but water should be sprayed automatically when the temperature rises too high. 3. Does the injected steam/desalinated water have an impact on the flue gas fan or the triple rotor?
Regarding 2. Setting the frequency at which this process is activated, in my opinion it should not be activated under normal conditions, and water should be sprayed automatically when the temperature rises too high. In terms of process design, H2O and steam should be sprayed simultaneously; the steam is used to atomize (vaporize) the water. Both H2O and steam enter the flue in gaseous form, on an intermittent basis, with little impact on the flue gas and the three spin elements.
1. Has your company established this process? Yes. 2. Determine how often this process should be activated; in my opinion, it should not operate under normal conditions, but water should be sprayed automatically when the temperature rises too high. It is activated under normal conditions, but the control valve is closed. Steam and water spray range control. 3. Does the injected steam/desalinated water have an impact on the flue gas fan or the triple rotor? It will have an impact. If the injection point is too close to the triple rotor, steam injection will cause scaling, while water injection will cause deformation of the partition. I don’t know if it will have an impact on the cigarette machine. However, cooling steam and water are provided to prevent the smoke extractor from overheating.
What is the frequency of activating this process? In my opinion, it should not be activated under normal conditions, and water should be sprayed automatically when the temperature rises too high. In terms of process design, H2O and steam should be sprayed simultaneously after mixing; the steam is used to atomize (vaporize) the water. Both H2O and steam enter the flue in gaseous form, and this occurs intermittently, having little impact on the flue gas and the three spin elements
1. Has your company established this process? It was a technical measure project during the initial equipment renovation. 2. Determine how frequently this process should be activated; in my opinion, it should not operate under normal conditions, but water should be sprayed automatically when the temperature rises too high. The process has never been put into use to date. It is said that the leader’s business trip coincided with the time when others put the equipment into use, which caused vibrations in the smoke extractor to reach a critical level, thereby creating a psychological burden. It is designed for temperature control, with the dual valves following a hierarchical control concept. When enabled, steam is used first followed by water; when disabled, the order is reversed. 3. Does the injected steam/desalinated water have an impact on the flue gas fan or the triple rotor? Although it hasn’t been applied in practice, it certainly exists from a theoretical perspective!
I’ve seen Shengma in Sichuan install this; you can ask them.
During the subsequent technical upgrades, we connected steam at the inlet of the three-spinners, but not water. It’s rarely used; I’ve used it once, and the results were okay. It has little impact on what comes later.