Steam turbine bypass system.

摘要

A bypass system for a steam turbine wherein the energy level of the steam (76) bypassed around the intermediate pressure and low pressure turbines (13, 14) is modified by introduction of cooling water (87). The amount of water introduced is adaptively varied as a function of the enthalpy of the bypassed steam as measured by a sensor (140) in the steam path (76). This arrangement provides numerous advantages such as a significant saving in pumping energy, a reduced likelihood of condenser (40) overheating and prolonged life of condenser, over the prior art system relying merely on the flow rate of the bypassed steam for cooling water flow computation.