| 摘要 |
In a centrifugal steam compressor having sealing water discharge at pressure higher than atmospheric pressure, a simple structure in which a high-pressure piping system is omitted as much as possible from a sealing water circulation system is realized. A shaft seal system 50 is capable of supplying high-pressure sealing water and low-pressure sealing water. The shaft seal system has a circulating water reservoir 240 to store circulating water, a positive displacement pump 200 to suck the circulating water from the reservoir, and is capable of supplying the sealing water to a first pressure regulating valve 290 provided in a high-pressure side sealing water line 330 of a centrifugal compressor 100 and a second pressure regulating valve 300 provided in a low-pressure side sealing water line 310 of the centrifugal compressor, an accumulator 210 provided between the positive displacement pump and the first and second pressure regulating valves, return pipings 315, 316, 335 and 336 to return the sealing water, which water-seals seal means of the centrifugal compressor, to the circulating water reservoir, and depressurization means 313, 314, 333 and 334 interpositioned in the middle of the return pipings. |
