Can the main air stream not be vented during catalyst startup?
Thread Content
During catalytic startup, can the main air be fed directly into the regenerator without being vented? I hope to receive guidance from all the teachers. Thank you!
If this goes directly into the regenerator, it will cause an extremely high starting current, right? Even the power trip, I guess
Under normal circumstances, when starting the main fan, it is necessary to open the vent; the system is operated for a while first, and only once all parameters are normal is the main air introduced into the regenerator； Besides, at the beginning when starting to operate the two dryers, it was an abnormal period with many unknown factors, so it was not possible to directly connect them to the regenerator.
When starting up large turbines, it is necessary to pass through the critical speed; in any case, surge occurs, and venting is an essential control measure
Actually, this question is quite simple. When you have time, take a look at the surge curve of the unit – what is the surge range at low load levels? It is difficult to ensure that the unit does not experience surge within such a small range; if I were in your shoes, I would choose to increase the vent flow and raise the load, in order to prevent the unit from operating on the verge of surge. Or confidently control in a confined space?
Under normal circumstances, the vent must be opened when the main fan is started. It operates for a few minutes first, and only after all parameters are normal is it permissible to connect the main wind to the regenerator.
The general steps for starting up are to first release the pressure, then gradually build up pressure while checking how the machine operates; it is not recommended to connect it directly
In principle, it’s not impossible; as long as the flow from the main fan outlet to the two reactors is unobstructed, the flow of flue gas inside those reactors is smooth, the regeneration/reaction process proceeds without issues, and the vent at the top of the reactor is fully open. Just make sure there is no compression in the posterior area. However, the main fan unit is equipped with mandatory protection during startup; it is not possible to allow startup while having the anti-surge valve closed.