Air leakage from the steam seal of a back-pressure turbine
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Have you encountered any leakage issues with the steam seals in back-pressure turbines? We replace the steam seals every time we carry out maintenance, but the effect isn’t significant; a large amount of steam leaks into the atmosphere through the shaft seals
Try reducing the sealed steam pressure a bit
How can steam leak into the atmosphere? Don’t you turn on the steam seal extractor when starting up? The preheating time of the turbine is not short enough, there is insufficient drainage from the turbine casing, or the inlet steam temperature is below 380 degrees Celsius. As a result, the preheating expansion coefficient of the turbine is insufficient, causing steam leakage from the steam seal.
Turn on the vapor seal extractor when starting up. All measures have been taken, but if there’s still leakage, it seems abnormal. I’m asking everyone if there are any good solutions
Does the steam seal extractor have a vacuum gauge? Check the steam seal extractor to see if its cooler is not providing adequate cooling or if it is clogged with scale.
There is a pressure gauge; the negative pressure is very low. Replacing the steam seal cooler didn’t have a significant effect either
It is normal for steam to come out from the vent pipe, but it is abnormal if it escapes along the shaft from the shaft seal.