Title: Fault Tolerant Thermal Control of Steam Turbine Shell Deflections,
Abstract: The metal-to-metal clearances of a steam turbine during full or part load
operation are among the main drivers of efficiency. The requirement to add
clearances is driven by a number of factors including the relative movements of
the steam turbine shell and rotor during transient conditions such as startup
and shutdown. This paper includes a description of a control algorithm to
manage external heating blankets for the thermal control of the shell
deflections during turbine shutdown. The proposed method is tolerant of changes
in the heat loss characteristics of the system as well as simultaneous
component failures.