| 摘要 |
PURPOSE:To prevent an increase in the exhaust loss at partial load by providing a steam reducing valve for each stage at the inlet of a low pressure turbine of a turbine plant, and connecting the same to a steam reducing valve at the inlet of a high pressure turbine. CONSTITUTION:Steam reducing valves 8-11 are provided at the inlet of each stage of a low pressure turbine of a turbine plant having a high pressure turbine 2, intermediate pressure turbine 3 and low pressure turbine 4-7. When the load is lowered and the exhaust loss is increased, the valve 11 is almost fully closed at a set point and only a minimum flow is directed through the low pressure turbine 7. As such, the pressure of each stage of the low pressure turbine is increased to increase the velocity of the axial flow of the exhaust at the outlet of the final stage, resulting in a reduction of the exhaust loss. Also, when the valve 11 is closed, a signal is sent to a valve 1 so that the valve 1 may be opened in an interlocking manner to reduce a throttle loss. |
