It can reduce back pressure to maintain the turbine speed
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We often encounter a drop in the medium-pressure steam pressure entering the backpressure turbine, which causes the throttle valve to open almost fully. Now, is it possible, when the steam pressure drops, to redirect the steam output to the vent in order to reduce the backpressure and thus maintain the rotational speed while ensuring normal operation?
There are those who do it this way, but the best approach is to get in touch with the upstream party to restore steam supply
It is possible to reduce the amount of processing, thereby avoiding wasted energy from venting. Additionally, it is necessary to contact the dispatch team to find out the reason for the low pressure of the medium-pressure steam and restore the medium-pressure level promptly!
Sure, we have done that too (by appropriately reducing the low-pressure steam pressure)
I think you should pay attention to the temperature of the steam at the inlet at this time, as the temperature decreases as pressure drops. If all the speed control valves are fully open, it indicates that the steam pressure has dropped significantly. A drop in temperature can cause steam to carry water, resulting in shock to the impeller.
For our medium-pressure steam at 3.5 MPa, an emergency shutdown is recommended whenever the temperature is below 380°C
The lower the processing volume, the less gas is produced and the lower the pressure
Steam should not contain water, because as long as the furnace remains running, the saturated steam that comes out of it is superheated steam
Do you generate your own steam for internal use, without any steam pipeline system?
When going from saturated steam to superheated steam, one parameter that is important is dryness. A decrease in dryness increases the tendency of the steam to liquefy, which poses a risk in situations where the turbine operates at high speeds. Of course, without considering the engine unit, appropriately reducing the back pressure can maintain the compressor speed