Regenerator desulfurization line issue
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Our regenerator catalyst discharge line leads out from the bottom of the regenerator; however, due to the high temperature of the catalyst inside the regenerator, this discharge line is always overheated. We are now considering setting up the discharge line again using an external heat exchanger – is this feasible? I hope to receive guidance from all the teachers. Thank you!
The desizing line is always overheated, so the desizing speed needs to be controlled. The external heat exchanger itself should have a deslagging line.
Of course. The temperature after external extraction is much lower than that in the regenerator, which also helps to extend the lifespan of the valves on the agent discharge line
It is feasible to add a desulfurization line to the external heat exchanger; however, it is recommended to control the speed at which desulfurization takes place. If speed control still proves ineffective, fins can be added to the desulfurization line to enhance heat dissipation. For specific details, refer to the desulfurization line used at Guangxi Petrochemical
If it is two-stage regeneration, how to address the high carbon content in the external descaling agent?
It turns out that not everything is included in the design.
The desulfurization agent should be handled in a small fluidized bed similar to that used for feeding materials; the flow rate of the fluidizing air is used to control the desulfurization agent’s flow rate, and this process also serves to cool the catalyst. It can also be used as a pneumatically controlled lock; by closing the fluidization valve, the catalyst will become stuck. There will be no valve wear.
Our external heat exchanger is equipped with a desulfurization line, but it is used for removing the desulfurizing agent from the external heat exchanger after shutdown; for regular desulfurization of the regenerator, the large-scale desulfurization line of the regenerator is used. Although the temperature of the pipeline during desulfurization is difficult to control, it can still be managed, as long as one proceeds slowly when starting the process.
Increasing the external heat input at the deslagging line can indeed lower the deslagging temperature! But the agent cannot be removed too quickly, as this can easily cause fluctuations in external heat! So when removing the agent, it’s sufficient to control the speed; whether it’s added or not makes little difference!
There is a desulfurization line at the fluidization air area at the bottom of the external heat exchanger; we have used it, but it affects the fluidization in the external heat exchanger. Now we connect it from the lower part of the external heat exchanger’s cylinder
Fluidized air deslagging line? Is the original location farther from the purified air pipeline than the location after renovation?