powerzizo
Mechanical
- Aug 23, 2013
- 15
We are running a power station with two steam turbine units 360MW each. in which SEIMENS EMLO-F 2BE1 liquid ring vacuum pump installed two per each steam turbine unit. Normally with 2 pumps in service we are able to pull condenser vacuum from atm to 130mbara in 70 minutes. We had a problem last week during one unit start up where vacuum pulling process went very slow and it took almost 30 hours to reach 130 mbara. Finally the unit is back in operation and we are investigating the root cause. The main concern is that the issue is not resolved yet and we will face the same situation during any startup . we doubt the performance of the vacuum pumps or air ingress source to the condenser, based on the attached trend that shows the behavior of turbine exhaust pressure/vacuum pumps inlet and liquid ring temperature/turbine exhaust temperature.we did not make Helium leak detection test to check if we have air ingress. Appreciate your thoughts on which is more probable root cause (i.e issues with the vacuum pumps or air ingress).
Thank You
Thank You