Abstract
Temperature related decrease of steam turbine components is one of the
main transient processes that occur during a typical long-term operation.
With a natural cooling (no user interference) it takes more than 14 days
before the temperature of components reaches the level that allows to open
and repair a turbine. It is then reasonable to apply a forced cooling in
order to decrease the time between a shut-down of a power generating unit
and a beginning of a repair. This paper presents the analysis of
application of a forced cooling process to supercritical steam turbines.
The main problems under the investigation are the safety issues of the
process and the optimization of cooling conditions. The paper describes
the safety restrictions and the optimization criteria. The process is
analyzed in numerical simulations conducted for various cooling conditions.
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