| 摘要 |
<p>This invention relates to a nozzle for use in a geothermal steam turbine and method for preventing adhesion of scale thereto which are adapted to prevent precipitation and adhesion of scale onto the surface of the nozzle. A coolant water passageway (22) is provided in an initial stage nozzle (21) of a geothermal steam turbine or the like, an inlet side passageway (22a) of this coolant water passageway is communicated with coolant water inlet passageways (25, 26) provided in inner and outer turbine casings (23, 24), respectively, and also an outlet side passageway (22b) is communicated with coolant water outlet passageways (27, 28). Owing to the above-mentioned construction, coolant water (30) is made to pass through the coolant water passageway (22) within the nozzle (21) from a coolant water feed source to lower the surface temperature of the nozzle, and thereby reevaporation and condensation of drain on the blade surface are prevented to prevent precipitation of scale. <IMAGE></p> |
