초록 ▼

To provide auxiliary steam, a low pressure valve is opened in a combined cycle system to divert low pressure steam from the heat recovery steam generator to a header for supplying steam to a second combined cycle's steam turbine seals, sparging devices and cooling steam for the steam turbine if the

To provide auxiliary steam, a low pressure valve is opened in a combined cycle system to divert low pressure steam from the heat recovery steam generator to a header for supplying steam to a second combined cycle's steam turbine seals, sparging devices and cooling steam for the steam turbine if the steam turbine and gas turbine lie on a common shaft with the generator. Cooling steam is supplied the gas turbine in the combined cycle system from the high pressure steam turbine. Spent gas turbine cooling steam may augment the low pressure steam supplied to the header by opening a high pressure valve whereby high and low pressure steam flows are combined. An attemperator is used to reduce the temperature of the combined steam in response to auxiliary steam flows above a predetermined flow and a steam header temperature above a predetermined temperature. The auxiliary steam may be used to start additional combined cycle units or to provide a host unit with steam turbine cooling and sealing steam during full-speed no-load operation after a load rejection.

대표청구항 ▼

1. Apparatus for supplying auxiliary steam to an end user comprising:a combined cycle system including a steam-cooled gas turbine, a steam turbine and a heat recovery steam generator in heat transfer relation with hot products of combustion from said gas turbine, said heat recovery steam generator i

1. Apparatus for supplying auxiliary steam to an end user comprising:a combined cycle system including a steam-cooled gas turbine, a steam turbine and a heat recovery steam generator in heat transfer relation with hot products of combustion from said gas turbine, said heat recovery steam generator including a low pressure heater for generating steam and driving said steam turbine; a reheater for flowing spent cooling steam from said gas turbine to said steam turbine; a low pressure control valve for diverting at least a portion of the low pressure steam generated by the low pressure heater for flow through a first conduit for auxiliary steam use; a high pressure control valve for diverting at least a portion of the spent high pressure cooling steam from said gas turbine for flow thereof through a second conduit; a third conduit for receiving the low pressure and high pressure steam flows of said first and second conduits, respectively, and defining an auxiliary steam conduit for flow thereof to an end user; and a water attemperator in said third conduit for controlling the temperature of the auxiliary steam.