| 摘要 |
PURPOSE:To provide a condenser wherein the concentration of oxygen in the condensate which is deaerated in the condenser in prevented from rising and the period required for starting a steam turbine plant can be shortened, by introducing steam present outside a steam turbine between a ceiling plate of a hot well and the liquid level of the condensate stream so that the steam is caused to flow in a condensate flowing passage and to cover part of the surface of the condensate. CONSTITUTION:Dripping condensate 5 is allowed to drip onto an upper ceiling plate 9 and the hot well ceiling plate 7, and flows as a condensate thin film stream 30 on the hot well ceiling plate 7 into the hot well 8 where it is stored as condensate 6. Between the flowing surface of the condensate 6 and the hot well ceiling plate 7 is introduced steam from outside. An auxiliary steam pipe 21 is provided and extended via a scavenging auxiliary steam valve 27 to the space 11 over the condensate. Auxiliary steam 29 introduced into the space 11 over the condensate flows in a direction opposite to the flowing direction of the condensate flow 31, and further flows to cover the surface of the condensate thin film stream 30 so that the gas having a high oxygen concentration is swept. Thus, old non-deaerated water would not dwell in the hot well 3 for a long time so that there is no possibility that oxygen is redissolved into the fresh deaerated water.
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