| 摘要 |
PURPOSE:To always realize a stable speed control in which the amount of mixed pressure steam is controlled by an adjusting valve positioned outside of a turbine body, by associatingly controlling the opening degrees of the above-mentioned adjusting valve in accordance with the opening degree of a high pressure steam adjusting valve, with the use of a control device. CONSTITUTION:In a turbine body 1 for driving driven units 2 such as, for example, a generator, etc. high pressure steam is introduced from a high pressure steam line through a high pressure emergency shut-off valve 4 and a high pressure steam adjusting valve 5 while an excess of low mixed pressure steam is introduced from a mixed pressure steam line 8 into the intermediate stages of the turbine body 1 through a mixed pressure steam adjusting valve 6 and a mixed pressure shut-off valve 7. In this arrangement, a control device 12 controls the mixed pressure steam adjusting valve 6 in accordance with the output of an opening degree transmitter 13 which generates signals in accordance with the opening degrees of a pressure adjusting meter 11 for mixed pressure steam and the above-mentioned valve 5. That is, when the high pressure steam adjusting valve 5 is positioned in a predetermined opening degree range, the opening degree of the mixed pressure steam adjusting valve 6 is forcedly controlled to be less if the opening degree of the same exceeds a predetermined value. |
