Patent ID: 8360402

Claim:
A multi-pressure condenser having a first condenser inside which a vacuum low-pressure chamber is formed and a second condenser inside which a vacuum high-pressure chamber having a higher pressure than the low-pressure chamber is formed, the first condenser comprising: a first cooling water tube bundle provided with a plurality of tubes which are provided so as to penetrate the low-pressure chamber and in which cooling water is distributed; a pressure barrier which extends in horizontal direction below the first cooling water tube bundle so as to separate internal space of the first condenser into upper and lower portions, the upper portion defining the low-pressure chamber and the lower portion defining a first hot well, and which has a plurality of through holes; and a heat-transfer tube inside which fluid introduced from outside the first condenser into the first hot well is distributed, wherein a gas phase part and a liquid phase part are formed respectively at the upper and the lower portions of the low-pressure chamber, and liquid in the liquid phase part is dropped into the first hot well through the plurality of through holes to form a gas phase part and a liquid phase part at the upper and the lower portions of the first hot well, the second condenser comprising: a second cooling water tube bundle provided with a plurality of tubes which are provided so as to penetrate the high-pressure chamber and in which cooling water is distributed, wherein condensate generated in the high-pressure chamber is accumulated below the second cooling water tube bundle to form a liquid phase part, and a gas phase part is formed above the liquid phase part, and the multi-pressure condenser further comprising: a steam duct allowing the gas phase parts of the first hot well and the second condenser to communicate with each other; and a pipe allowing the liquid phase parts of the first hot well and the second condenser to communicate with each other, wherein fluid having a higher temperature than the condensate accumulated in the first hot well is fed to the heat-transfer tube.