Main air supply interrupted
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Once the main air supply is interrupted, all feed to the reactor should be immediately cut off, and no combustion oil shall be injected into the regenerator. Bed sealing can be employed when conditions permit. If the main air flow does not recover even when the regeneration temperature is reduced to 450°C, the catalyst should be removed to prevent the catalyst from getting clogged with sludge or to avoid difficulties in raising the temperature again. Question from a beginner: 1. What does “it is possible to use the bed-sealing method when conditions permit” mean? 2. “If the main air flow does not recover even when the regeneration temperature is reduced to 450°C, the catalyst should be removed to prevent the catalyst from getting clogged with sludge or to avoid difficulties in raising the temperature again.” What does it mean? Please give me some advice. Thank you
Catalysis experts, please come and answer!
A blocked bed means that air cannot enter the regenerator; all of the catalyst is located inside the regenerator. When the temperature drops to 450 degrees, the main air, at around 170 degrees, enters the regenerator and absorbs some of the heat, which may lower the auto-ignition temperature of the combustion oil (above 380 degrees). If the combustion oil cannot be ignited, it becomes impossible to raise the temperature and resume operations.
To be honest, 450°C is a bit low for you. The temperature of the main wind is just over a hundred degrees. Besides, I’m afraid we won’t have to wait until it drops to 450°C to find out whether the device will keep running or not
“If the main air flow does not recover even when the regeneration temperature is reduced to 450°C, the catalyst should be removed to prevent the catalyst from becoming clogged with sludge or to avoid difficulties in raising the temperature again. What does it mean? When the regeneration temperature is low, the main air flowing in does not reach the auto-ignition temperature of the combustion oil; as a result, it is not possible to raise the temperature of the regenerator. The only solution is to remove all the catalyst, heat up the auxiliary combustion chamber, and then reinstall the catalyst in the regenerator. Under normal circumstances, there is no need to do this
Upstairs: “Generally, there’s no need to do this.” What does that mean? Is there a better way to handle it?
“A ‘clogged bed’ means that no air can enter the regenerator; all of the catalyst ends up inside the regenerator. Is it necessary to supply steam to the bottom of the regenerator continuously?
I would like to ask the teachers: The book states that when the main air supply is interrupted, the feed is stopped, and the two reactors operate in isolation. Once it is confirmed that the process conditions are safe, the dead catalyst plug valve is opened to transfer the catalyst from the settler to the regenerator. After the transfer, is it still necessary to supply steam to the settler and the reactor? When it says “confirm that the process conditions are safe,” what exactly does it mean for the process conditions to be safe?
Question from a beginner: 1. What does “it is possible to use the bed-sealing method when conditions permit” mean? The main fan has stopped working; if you don’t keep the bed in a fluidized state, how can fluidization take place? Be careful not to block the main fan when getting up – it’s important to avoid leaving the bed in that state. 2. “If the main air flow does not recover even when the regeneration temperature is reduced to 450°C, the catalyst should be removed to prevent the catalyst from getting clogged with sludge or to avoid difficulties in raising the temperature again.” What does it mean? It depends on what your requirements are; a lower temperature definitely won’t work.
I’m asking the person above: With the main fan stopped working, if you don’t use a bed fan, what will be used for fluidization? Be careful not to keep the main fan running while getting up; it’s important to avoid getting stuck in the bed. Before removing the agent, wasn’t accident steam being introduced? How can one die in bed?
Upstairs: After the pressure dropped, did you keep supplying industrial air? Stop after using a laxative?