Analysis of the reasons for increased steam flow and decreased vacuum in steam turbines
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Today, after one set of the system stopped operating, the vacuum level of the turbine in the other set increased, and the steam consumption rose by more than ten tons. Once the start-up exhaust pump was activated, the vacuum level returned to normal; when the pump was turned off, the steam consumption also returned to its normal level. What caused this? Remarks. After the shutdown of the other system, the turbine experienced a significant fluctuation in load, but it quickly returned to its original load level.
First, increase the extraction of non-condensable gas; after that, stop it as the situation has returned to normal
I agree with the person above; I have another question here: are these two sets of devices related to each other? Why does the non-condensable gas from that operating turbine increase?
Does the poster have two turbines sharing one surface condenser? If that’s the case, it makes sense – when one unit stops operating, the amount of steam exhaust from the turbines that reaches the surface condenser decreases, and as a result, less steam is condensed. This leads to an increase in vacuum level. The extent of this increase depends on the relative amounts of steam exhaust from the two turbines; the less steam exhaust from the unit that has stopped operating, the less impact it will have on the vacuum level.
This post was last edited by Cuicui Chang on 2015-8-5 09:25. Um… it’s impossible for you to be using the same condenser, right? I’ve never seen a design like this. The main reason lies in the steam pipeline system; generally, steam of the same pressure level is delivered to users through a single pipeline. When one unit stops operating, the pressure in the steam pipeline increases. The timing errors in the control systems of the boilers, combined with the timing errors in the throttle valves of the units, lead to the situation you described. You can check the historical data to see whether, after that unit stops operating, the throttle valves of the remaining units gradually close before opening again, resulting in an immediate increase in steam flow, an increase in displacement, slight fluctuations in speed, and an increase in exhaust pressure.
There is no connection; it’s just two sets that supply air simultaneously to the rear. All use steam of the same pressure rating. It’s probably due to the increased pressure as mentioned above, which causes more steam to enter without fully condensing.
They are not the same; both sets are unrelated to each other – it’s just that the product gas and steam influence one another