Does the exhaust temperature always be high when all condensing steam turbines are started up? Why?
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Does the exhaust temperature always be high when all condensing steam turbines are started up? Why?
The steam flow rate is too low, which results in a high exhaust temperature; this applies not only to condensing units but also to those with back pressure
The donkey isn’t pulling the mill, and yet it still runs away~~
Since less flow is required during startup, effective cooling cannot be achieved. At this time, the end blades generate a large amount of heat due to air friction, and this heat cannot be dissipated; as a result, the temperature at those ends can reach 90–100 degrees. Some units use boiler water to cool the ends during the startup process. Once the rated speed is reached, the temperature will drop, generally to around 35-45 degrees.
Does it mean that a high steam flow rate results in more work being done, thus a lower temperature, while on the other hand a low flow rate means less work is done, leading to a higher temperature?
Refer to the exhaust pressure; it is proportional to the exhaust temperature
Steam also serves a cooling function to some extent