| 摘要 |
PURPOSE:To accomplish safe and stable control on the internal pressure of a condenser for an air bleeding apparatus for a steam turbine condenser system, by connecting a pressure regulating valve and a steam-containing air by-pass valve with an orifice between a suction pipe and a cooler ejector exhaust air inlet box. CONSTITUTION:When the temperature of cooling water is lowered in winter, the degree of vacuum in a condenser is increased, so that air diluted by steam is drawn into a by- pass pipe 30 from an ejector exhaust air inlet box 27. Here, the opening of a valve 31 is adjusted to a value within the maximum by-pass flow rate of an orifice 32. Resultantly, the virtual flow rate of a first-stage ejector 17 is increased while the degree of its suction vacuum is lowered, so that the degree of vacuum in a condenser main body 10 is also lowered. Since the by-pass flow almost consists of steam, it is condensed at a precooler 21 and the suction quantity of a second-stage ejector 24 is not increased substantially, so that only a small change is caused in the degree of vacuum. Therefore, the degree of suction vacuum of the ejector 24 is kept in a stable manner at a value between the degrees of vacuum at the suction side and the discharge side of the ejector 17. |
