| 摘要 |
PURPOSE:To prevent droppage of steam pressure at the inlet of steam turbine due to excessive extraction by controlling a pressure regulation valve for feeding the steam to the outside of system through the pressure signal at the inlet of steam turbine and the auxiliary steam pressure signal. CONSTITUTION:A pressure transmitter 39 is provided for the steam of steam turbine 45. A pressure transmitter 38 will detect the pressure of auxiliary steam 42. An operator 62 will normally control the pressure regulation valve 33 on the basis of the signals from the pressure transmitter 38 and a setting level transmitter 61. Upon droppage of steam pressure 45 of steam turbine, the operator 62 will control the pressure regulation valve 33 while taking priority of the signal from a setting level transmitter 66. Consequently, the extraction of auxiliary steam 42 is reduced to recover the pressure of the steam of steam turbine 45, resulting in prevention of steam pressure droppage at the inlet of steam turbine. |
