The catalytic main fan is operating; the main oil pump stops due to power fluctuations, the auxiliary pump does not start, the flue gas turbine disc valve is not closed, and the main fan shaft is damaged?

It’s probably the bearing bush that’s burned out. It should be fixed and still work. Is there no interlock for oil pressure?

When something like this happens, there’s nothing but to accept it as bad luck. But don’t the high-level fuel tank and manual fuel pump work there?

There is self-protection in place: if the main fan keeps running while the auxiliary oil pump fails to start, the pressure drops below 0.1 MPa, and the unit shuts down via interlock. Under no circumstances should all oil pressure protection systems be disabled casually! Another thing is that this auxiliary oil pump needs to be tested every time it is started to see if it can start on its own.

Did the engine unit not send a low oil pressure protection signal? Under normal conditions, low oil pressure is associated with four switch signals: one is responsible for starting the low oil pressure auxiliary pump automatically, while the other three are used in a two-out-of-three configuration to trigger an automatic shutdown. The low oil pressure auxiliary pump does not start automatically either because no signal is sent, or due to a fault in the circuit or the pump itself ； There is no action in the cascading shutdown process. On the one hand, the low oil pressure switch does not send out a cascading signal; on the other hand, the logical program is not executed. It is possible to determine whether a cascading signal has been sent by checking whether the main motor shuts down in a cascading manner – if not, it means only the smoke extractor shuts down in a cascading fashion. If a cascading signal is sent, shouldn’t the high-temperature gate valve also operate, even if the high-pressure valve does not move? Just happened?

It’s the main oil pump that stops working due to power outages; when the UPS loses power, the smoke extractor doesn’t activate. Normally, people don’t pay attention to power outages, and as a result the UPS runs out of power as well. The UPS needs to be checked more frequently.

Our equipment typically tests its self-protection interlock once a week; if it does not activate in an accident scenario, especially in the case of voltage fluctuations, it is likely that the high voltage remains active while a certain section of the low voltage system experiences fluctuations, resulting in the failure of the interlock

Under normal conditions, the low oil pressure auxiliary pump starts automatically; in addition, there is a low oil pressure interlock system, with a three-out-of-two configuration used for triggering shutdown. The reason why the low oil pressure auxiliary pump does not start automatically is either due to the absence of a signal or due to a fault in the circuit or the pump itself； There is no action in terms of sequential shutdown; on the one hand, the low oil pressure switch does not send out a sequential signal, and on the other hand, the logical program does not execute accordingly. It is possible to determine whether a sequential signal has been sent by checking whether the main motor shuts down sequentially – if no such signal is sent, then only the smoke extractor stops operating as part of the sequential shutdown process. If a sequential signal is sent, even if the high-temperature butterfly valve does not move, the high-temperature gate valve should still operate. Moreover, a standard high-capacity fuel tank can provide enough fuel to last for about half an hour, and the manual fuel pump can also be used during that time.

In foreign designs, the main oil pump is driven by a steam turbine, while the auxiliary oil pump is driven by an electric motor. Few manufacturers produce domestic small turbines.

Our main oil pump is a steam turbine, manufactured in the United States