What is the appropriate temperature for the catalyst in a regenerator’s ‘dead bed’? Can high temperatures cause damage to the equipment? Is it necessary to use shielding steam for internal heat extraction?....
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As the title suggests, I would appreciate it if experts could explain this to me! :)
Everyone, please pay attention and give some feedback; it will help us elementary school students to learn better*learn*.
What is the appropriate temperature for the catalyst in a regenerator’s ‘dead bed’? Can high temperatures cause damage to the equipment? Is it necessary to use shielding steam for internal heat extraction? When the regenerator becomes clogged, our procedure involves raising the temperature of the dense phase in the regenerator by about 20-30 degrees above the operating temperature, stopping the injection of combustion oil, and then shutting off the main air flow to cause the bed to become clogged. During this process, the temperature drops; catalysts can withstand temperatures of up to 800 degrees for several hours, so this temperature can be increased slightly to facilitate the rapid re-injection of combustion oil once the problem is resolved. (Also, when getting up, since the fuel burning in the bed layer is not completely burned, the temperature first rises and then drops, but by only a few degrees.) The temperature inside the two devices can rise much higher due to damage to their internal components; therefore, there’s no need to worry about the equipment in the regenerator, but the temperature must not exceed 720 degrees. Internal heat removal in the regenerator is necessary during the bed packing process to prevent damage to the steam pipelines; after the bed packing is complete, heat removal can be stopped by cutting off the steam supply, but it is important to ensure that either an alternate path or the original path remains open to avoid pressure buildup. I’m not sure if the explanation is clear; feel free to ask more questions if you have any.
Thank you for your advice! In the event of an accident, the forced \"bed shutdown\" triggered by the activation of the main air self-protection interlock means there is no opportunity to inject combustion oil to raise the temperature. Are there any special things to keep in mind when muddying the bed in this state? Additionally, in the event of an emergency bed shutdown, can the precipitator catalyst (raw catalyst) be transferred to the regenerator? When should one switch to the regenerator? Especially when initiating the main air self-protection emergency bed sealing in winter, to prevent the precipitator from being fed with steam for an extended period and causing the catalyst to become sludgy, it is necessary to transfer the catalyst to the regenerator. What issues should be given special attention in such situations? Hehe, many questions? I would be grateful for your advice! !
The main air protection system activates; in the event of a bed blockage due to an accident, prevent burning oil from entering, shut off the air supply to the combustion tank, and close the primary and secondary air valves. It defends itself so quickly that the living agent doesn’t have time to react; even after the bed is sealed, it can’t turn around. If the time is not too long, the unreacted material will not mix with the mud; after all, the unreacted material is also at around 500 degrees, and even at 300 degrees it’s not a big problem. It’s still beneficial to improve the quality of the superheated steam. If it can be transferred. It must be rotated; after rotating, pay attention to the bed temperature when introducing the main airflow to prevent overheating!
After the main air self-protection mode activates and the bed is shut down, emergency steam from the main air system will be used; it is also necessary to cut off this steam, otherwise prolonged use will cause problems with the catalyst and sludge, making it difficult to deal with them once recovery is attempted.
In many places, powered air is used directly in place of accident steam; even when the system is shut down, the powered air system can still maintain the minimum requirements for fluidization!