| 摘要 |
PURPOSE:To realize an appropriate control of steam temperature without lowering the thermal efficiency of a plant, by dividing a superheater provided in a waste heat recovery boiler into a high-temperature superheater and a low- temperature superheater, and controlling the quantities of steam passed through the superheaters. CONSTITUTION:A high-temperature superheater 21 and a low-temperature superheater 22 are provided in a waste heat recovery boiler 10. A saturated steam is introduced from a drum through a piping provided with a flow rate control valve 50, the steams heated by the superheaters 21, 22 are mixed with each other out outlet side of the superheaters, and the mixture is led to a steam turbine. The flow rate control valve 50 is controlled to regulate the quantities of the steam passed through the superheaters 21, 22, whereby the temperature of the steam introduced to the turbine can be controlled to within an appropriate range. The flow rate control valve 50 maybe provided in one or both of the pipings connecting the superheaters 21, 22 to the steam drum, or may be provided in outlet pipings for the superheaters 21, 22 (on the upstream side of the junction pint), whereby the purpose can be accomplished. |
