Full arc admission steam turbine

摘要

The invention relates to a full arc admission steam turbine, which includes a plurality of nozzle boxes for inducing steam, and a plurality of nozzle plates for bearing nozzles, one nozzle plate corresponding to each nozzle box. The steam turbine 100 further includes a plurality of spacer plates corresponding to the plurality of nozzle boxes, wherein the spacer plate is disposed between the nozzle plate and the nozzle box, by which a flow path is formed between the plurality of nozzle boxes and the plurality of the nozzle plates through the plurality of spacer plates to achieve a full arc admission. With the solution according to embodiments of the present invention, existing partial arc steam turbine may be easily converted to be a full arc admission steam turbine. This will reduce cost of equipment upgrading. Outage due to onsite conversion may be significantly reduced.

主权项

1. A full arc admission steam turbine comprising a plurality of nozzle boxes for inducing steam, and a plurality of nozzle plates for bearing nozzles, one nozzle plate corresponding to each nozzle box, the steam turbine further comprises a plurality of spacer plates corresponding to the plurality of nozzle boxes, wherein the spacer plate is disposed between the nozzle plate and the nozzle box, by which a flow path is formed between the plurality of nozzle boxes and the plurality of the nozzle plates through the plurality of spacer plates to achieve a full arc admission wherein the spacer plate is configured to be part of a circle, and the spacer plate comprise an outer ring, an inner ring separated from the inner ring by a communication space formed as part of the flow path, and two link portions disposed at opposite leading and trailing ends of the outer ring and the inner ring to connect the outer ring and the inner ring, characterised by the link portion having a less length in an axial direction of the steam turbine than that of the outer ring and the inner ring such that the flow path communicates with two adjacent communication spaces.