| 摘要 |
PROBLEM TO BE SOLVED: To provide an alternative solution to the problem caused by lack of uniformity in circumferential steam distribution in the control stage of a partial arc admission system. SOLUTION: The control stage 10 for a steam turbine comprises a plurality of staging valves 12 circumferentially distributed around the turbine for regulating steam admission flow so as to control the load of the turbine, nozzle chambers 14 connected to a downstream end of each staging valve 12; at least two arcs 16 for admission to form the downstream portion of each nozzle chamber 14; and a plurality of control stage nozzles 18 in the arcs 16 for admission at the downstream end of the nozzle chamber 14. In the control stage 10, the downstream portion of the arc 16 for admission in each nozzle chamber 14 has circumferential lengths L1, L2 different from each other. COPYRIGHT: (C)2010,JPO&INPIT |
