System combining power generation apparatus and desalination apparatus

Abstract

In a system combining a power generation apparatus and a desalination apparatus, the power generation apparatus includes a circulation circuit in which a first heat exchanger, an expander, a second heat exchanger having a space, the second heat exchanger for evaporating seawater and generating water vapor, and a working medium pump are connected in series, and a power generator, and the desalination apparatus includes a suction pump for suctioning a gas in the space, a control device for driving the suction pump in such a manner that an atmospheric pressure in the space becomes a saturated water vapor pressure, a condenser for condensing the water vapor led from the space, and a sweet water storage tank for storing sweet water (W) condensed in the condenser.

What is claimed is: 
     
         1 . A system combining a power generation apparatus and a desalination apparatus,
 said power generation apparatus comprising:   a circulation circuit in which a first heat exchanger for evaporating a working medium by exchanging heat between a power generation heat medium supplied from an exterior and the working medium, an expander for expanding the working medium, a second heat exchanger having a predetermined space, the second heat exchanger for condensing the working medium, evaporating seawater, and generating water vapor by exchanging heat between the working medium and the seawater supplied to the space, and a working medium pump for feeding the working medium condensed in said second heat exchanger to said first heat exchanger are connected in series; and   a power generator to be driven by expanding the working medium in said expander, and   said desalination apparatus comprising:   a suction pump for suctioning a gas in the space of said second heat exchanger;   a control device for controlling drive of said suction pump;   a condenser for condensing the water vapor by exchanging heat between a cooling medium supplied from the exterior and the water vapor led from the space of said second heat exchanger; and   a sweet water storage tank for storing sweet water condensed in said condenser.   
     
     
         2 . The system combining the power generation apparatus and the desalination apparatus according to  claim 1 , wherein said control device regularly controls to drive said suction pump. 
     
     
         3 . The system combining the power generation apparatus and the desalination apparatus according to  claim 1 , wherein:
 said desalination apparatus further has a pressure sensor for detecting an atmospheric pressure in the space of said second heat exchanger; and   said control device controls the drive of said suction pump in such a manner that the atmospheric pressure in the space becomes a saturated water vapor pressure when a value detected by said pressure sensor becomes a higher predetermined value than the saturated water vapor pressure of the water vapor in the space.   
     
     
         4 . The system combining the power generation apparatus and the desalination apparatus according to  claim 3 , wherein:
 said desalination apparatus further has a temperature sensor for detecting a temperature in the space of said second heat exchanger; and   said control device calculates a saturated water vapor pressure at the temperature from the temperature detected by said temperature sensor, and controls the drive of said suction pump with the calculated saturated water vapor pressure as the saturated water vapor pressure of the water vapor in the space.   
     
     
         5 . The system combining the power generation apparatus and the desalination apparatus according to  claim 1 , wherein said desalination apparatus further comprises:
 an evaporator for evaporating the seawater by exchanging heat between a desalination heat medium supplied from the exterior and the seawater;   an evaporator pump for feeding the seawater into said evaporator;   a first leading flow passage for leading water vapor to said first heat exchanger in such a manner that the water vapor generated in said evaporator is utilized as the power generation heat medium for said first heat exchanger; and   a second leading flow passage for leading the sweet water condensed in said first heat exchanger to said sweet water storage tank.   
     
     
         6 . The system combining the power generation apparatus and the desalination apparatus according to  claim 1 , wherein the seawater is used as the cooling medium for said condenser. 
     
     
         7 . The system combining the power generation apparatus and the desalination apparatus according to  claim 5 , wherein said desalination apparatus further comprises a solar collector for heating the desalination heat medium supplied to said evaporator.