Reasons for the temperature rise in the extraction steam pipeline
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In the extraction-type steam turbine, the extraction pressure is 1.0 MPa. At present, the intermediate extraction system is not in operation, yet there is pressure in the intermediate extraction pipelines; the pressure is 0.5 MPa and the temperature is 160 degrees. The DEH electrical control system is used for controlling the extraction steam. The curve from the temperature measurement points shows that the increase in extraction steam temperature begins within a short period after the turbine reaches 3000 revolutions per minute and starts to carry a load. I suspect the extraction valve of the turbine isn’t sealing properly. I’d like to ask everyone for their opinions. Thank you!
The valves that come with the unit should be of decent quality. However, some other control valves in our facility, including globe valves, also suffer from internal leakage. It’s really annoying!
The poor sealing of the extraction valve is the key to the problem.