Location for removing the catalyst from the device
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This post was last edited by Refiner on 2018-1-15 09:09. During normal operation, is it more appropriate to remove the catalyst from the bottom of the regenerator or from the external heat exchanger? Thank you!
The design originally called for them to be at the bottom of the regenerator, but due to severe pipeline wear after use, many were changed to the bottom of the external heat exchanger
The external extraction temperature is low, resulting in relatively less wear
It is easy to completely remove the catalyst from the bottom of the regenerator, but the temperature is high； It is not easy to completely remove the catalyst from the bottom of the external heat exchanger, but the temperature there is low.
In normal production, the desulfurizing agent is removed from the bottom of the external heat exchanger, where the temperature is relatively low
What the poster is referring to is the removal of waste agents during normal production. During normal production, the temperature is high when removing agents from the bottom of the coking tank, which puts significant stress on the pipelines and increases the risk level； To stop production and remove the material, it is still necessary to drain the agent from the bottom of the coking tank.
For regular catalyst removal, I recommend removing it from the bottom, as the temperature is low and thus no large amount of air is needed for cooling; moreover, removing it into the catalyst tank is beneficial for the tank itself
This post was last edited by Refiner on 2018-3-15 at 11:20. Our facility discharges the material from the bottom of the coking tank; the temperature is high, which increases the risk level. I also recommend discharging the material by removing heat from outside, and suggest that technical improvements be made in the future. But there is a concern: if heat is extracted and the agent is removed externally, first of all, can the temperature of the regenerator bed be well controlled? Secondly, our external heat extraction is of the downflow type and adjustable; by using external heat extraction for desulfurization, the amount of material that burns becomes lower, resulting in poor burning efficiency, which can lead to residual combustion and possible overheating of the equipment. Regarding the above two points, how should we strike a balance?
Don’t worry; normally, it is removed from the outside to access the heating base, and when operations stop, it is taken out from the bottom of the regenerator or the bottom of the coking tank.
How much catalysis is needed to ensure that the material at the bottom can be easily removed during regeneration? Generally, when draining the fluid, there is always an operator on site to oversee the process,... Under normal circumstances, the fluid is drained from the bottom of the external heat exchanger, where the temperature is low; this allows the fluid to flow steadily, with little impact on the regeneration temperature!
Using external heat for descaling – will this affect the heat absorbed and the steam production?