| 摘要 |
<p>FORWARD-REVERSE FLOW CONTROL SYSTEM FOR A BYPASS STEAM TURBINE A solution to the problem of excessive rotation loss heating in a bypass steam turbine has been provided by the introduction of a reverse flow of steam to the high-pressure section of the turbine during those operating periods in which such heating is of concern. The present invention is directed to a control system for automatically selecting either the forward or reverse steam flow regime as is most appropriate, depending on turbine and other related operating conditions. In a preferred embodiment, the control system includes means for selecting either a forward or reverse flow control signal to govern the steam admission control valves; means for controlling the reverse flow valve and having decisional logic for determining whether the reverse flow valve shall be open or closed; and means for controlling the ventilator valve and having decisional logic for determining whether the ventilator valve shall be open or closed.</p> |
