At startup, the issue with the catalyst converter
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1. When the catalytic unit is brought online, how is the catalyst in the regenerator transferred to the settler? Is it fast first and then slow, or slow first and then fast? 2. If the rate first increases and then decreases, could the temperature inside the settler rise too rapidly, leading to problems such as the lining coming off? 3. If the process starts slowly and then speeds up, could the material leg be blocked due to insufficient catalyst, leading to leakage of the material? Could an expert please help answer this? Thank you!
Start fast and then slow down; first, a proper seal needs to be established, and make sure the temperature is not too low
Why is the loading rate of the regenerator faster at first and then slower? Moreover, this statement is only made when loading the regenerator, and it is not specifically mentioned when changing the catalyst in the reactor. It is recommended that the original poster check the form of cyclone material discharge in the primary cyclone separator and settler of the regenerator, as well as their working principles.
So how do you go about it?
The regenerator transfers the catalyst to the settler, controlling the line speed and the heating rate. There is no fixed rule regarding speed; it depends on the circumstances. Pay attention to the two points mentioned above: line speed control is essential to ensure the efficiency of the cyclone separator, while the heating rate should be controlled to avoid excessive temperature increases, taking into account the requirements for line speed as well. It is different from a regenerator equipped with a catalyst.
Thank you. There’s one more thing I’m not quite sure about: how to control the line speed? There is no feed now, so it’s not possible to control it at the designed linear speed, right? What is a suitable linear speed control value based on general experience? Approximate range
It depends on the type of settler or cyclone separator you have; different types require different linear velocity requirements. VSS requires low-line-speed transfer agents, while VQS, FCS, CSS, etc. require high-line-speed transfer agents that can approach or reach the designed line speed; steam is used as the primary lifting medium instead of oil and gas. Take a close look at the design linear velocity and requirements for your cyclone separators. It helps you. The linear speed cannot be controlled, making it difficult to estimate the agent’s movement speed.
Thank you. We are from VQS. Is there an experienced range for line speed?