| 摘要 |
PURPOSE:To obtain stable control over output adjustment in the captioned plant with a steam extraction system regardless of variation in the amount of steam extraction by controlling the load output controlling system, based on the deviation between the detected value and the set value of the extracted steam pressure. CONSTITUTION:A steam extraction pipe 21 is branched out from a main steam pipe 20, which connects a waste heat recovery boiler 8 and a steam turbine 15, and an exhaust gas pressure detector 30 is installed in the middle of the pipe 21. A extracted steam pressure signal S20 detected by this detector 30 is compared with the predetermined extracted steam pressure S21 in order to obtain a deviation. This deviation signal S22 is converted into output adjusting signals S23 and S24, which are proportional to the deviation, by proportional controllers 32 and 33 situated on the gas turbine side and the steam turbine side, respectively, and the converted signals are impressed to adders 18 and 19 in the load output control system on the gas turbine side and the steam turbine side, respectively. With this contrivance, it becomes possible to control the load control system and adjust the output of the combined cycle in a stable manner regardless of variation in the amount of extracted steam. |
