CLOSED LOOP STEAM COOLED STEAM TURBINE

摘要

A power plant in which hydrogen and oxygen are combusted to produce a flow of high pressure, high temperature steam. The steam is expanded in a high pressure turbine employing closed steam loop cooling for the stationary vanes and rotating blades. A heat recovery steam generator produces the cooling steam by transferring heat from the expanded steam exhausting from the high pressure turbine to feed water. The cooling steam is directed through cooling passages formed in the vanes and blades of the turbine and the heated cooling steam is collected and returned to the cycle by directing it to the combustors where it serves to moderate temperature. Steam used to cool the intermediate and low pressure vanes and blades of the high pressure turbine is directed to an intermediate pressure turbine for cooling and expansion. An intermediate pressure combustor further heats the cooling steam prior to its expansion in the intermediate pressure turbine.