Seal steam
system is used to prevent the leakage of the steam from the gland seals. Even
though carbon-ring seals and labyrinth seals are installed
to minimize the leakage the super heated steam is
can leak through small pores present and as the steam is of very high
temperature of more than 500 degrees, it is very dangerous to the people
working around as the surrounding temperatures raises. If steam leakage takes
place, a lot of steam is wasted and the performance of the system is degraded.
The LPT (Low pressure turbine) is connected to the condenser where
the vacuum is maintained.
If leakage is present the vacuum will pull the outside air
into the system which has different temperatures due to which deformations can
take place in the metal areas, also if perfect sealing is not maintained the
vacuum present inside will be reduced and if the vacuum is not present, the
ability to pull the steam towards the condenser will not be done properly and
the steam may get condensed in the LPT area which is not at all desirable which
affects the plant performance. The vacuum maintenance is very much important
which is why there will be a set point up to which vacuum to be maintained. This
is why seal steam is very important in turbine which will seal the glands and
avoid any steam leakage and protect the system. The excess seal steam which enters the system will taken care by the leak steam system which moves the excess steam out of system.
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