Title:
HIGH-PRESSURE DRAIN PUMP SHAFT SEALING FACILITY
Document Type and Number:
Japanese Patent JP3547458
Kind Code:
B2
Abstract:
PURPOSE: To prevent flushing in the case of a sudden change in plant load by sealing water using clean, high-pressure condensate downstream of a condensate purifying device and at the inlet of a high-pressure condensate pump
CONSTITUTION: A sealing pipe line 22 branching from a condensate pipe line 9 at the delivery portion of a high-pressure condensate pump 8 is installed in the shaft seal portion of a high-pressure drain pump 20, and a temperature regulating valve 23 is installed in the sealing pipe line 22, for controlling the temperature of return water in response to a control signal from a temperature detection controller 24 installed in a sealed water return pipe line 25 leading from the shaft seal portion of the high-pressure drain pump 20. The return water is at the same pressure as atmospheric pressure and is collected into a return water collecting tank 26 by means of the sealed water return pipe 25 as gravity flow. Thereby the shaft seal portion of the high-pressure drain pump 20 is always controlled so that a pump suction temperature is about 50 to 60°C, which is much lower than about 180°C and higher. Therefore, even if pressure drop occurs as during the load shutdown of a plant, the shaft seal portion of the pump does not flush and so the function of sealing a shaft can be secured.
Inventors:
Toshio Onuki
Application Number:
JP4286093A
Publication Date:
July 28, 2004
Filing Date:
March 03, 1993
Export Citation:
Assignee:
Toshiba Corporation
International Classes:
F01D11/06; F01K23/10; F04B53/00; (IPC1-7): F04B53/00; F01D11/06; F01K23/10
Domestic Patent References:
| JP4194502A | ||||
| JP4342802A | ||||
| JP57148012A |
Attorney, Agent or Firm:
Hideaki Togawa