Patent ID: 9694323
Date: 2017-07-04
CPC Classifications: B01D

Claim:
1. An energy recovery apparatus, comprising: a first flow path switching device, a first intake port of the first flow path switching device communicating with an outlet of high-pressure condensed seawater of a membrane separation device and a first outtake port of the first flow path switching device communicating with a drainage path; a second flow path switching device which is provided separately from the first flow path switching device, a second intake port of the second flow path switching device communicates with the outlet of the membrane separation device and a second outtake port of the second flow path switching device communicates with the drainage path; a first cylinder device which comprises a first piston and communicates with the first flow path switching device without communicating with the second flow path switching device, a first end thereof conducting a first intake from a liquid supply arrangement and a first outflow to a pressure boosting arrangement via a flow path direction regulation arrangement, a second end of the first cylinder device communicating with a first inflow/outflow port of the first flow path switching device; a second cylinder device which comprises a second piston and communicates with the second flow path switching device without communicating with the first flow path switching device, a first end thereof conducting a second intake from the liquid supply arrangement and a second outflow to the pressure boosting arrangement via the flow path direction regulation arrangement, a second end of the second cylinder device communicating with a second inflow/outflow port of the second flow path switching device; a first judgment arrangement of the first cylinder device emitting a first signal upon determining that the first piston of the first cylinder device has moved from the second end of the first cylinder device toward the first end of the first cylinder device to a first predetermined position close to the first end of the first cylinder device; a second judgment arrangement of the second cylinder device emitting a second signal upon determining that the second piston of the second cylinder device has moved from the second end of the second cylinder device toward the first end of the second cylinder device to a second predetermined position close to the first end of the second cylinder device; a first switching judgment arrangement determining that a first flow path of the first flow path switching device has been switched from a first configuration, in which the second end of the first cylinder device is in communication with the drainage path, to a second configuration, in which the second end of the first cylinder device is in communication with the outlet of the membrane separation device; and a second switching judgment arrangement determining that a second flow path of the second flow path switching device has been switched from a third configuration, in which the second end of the second cylinder device is in communication with the drainage path, to a fourth configuration, in which the second end of the second cylinder device is in communication with the outlet of the membrane separation device, wherein, when the second flow path of the second flow path switching device is switched from the third configuration to the fourth configuration according to the first signal and the second switching judgment arrangement determines that the second flow path of the second flow path switching device has been switched from the third configuration to the fourth configuration, the first flow path of the first flow path switching device is switched from the second configuration to the first configuration a blockage of by the communication between the first intake port and the first inflow/outflow port, and wherein, when the first flow path of the first flow path switching device is switched from the first configuration to the second configuration according to the second signal and the first switching judgment arrangement determines that the first flow path of the first flow path switching device has been switched from the first configuration to the second configuration, the second flow path of the second flow path switching device is switched from the fourth configuration to the third configuration by the blockage of the communication between the second intake port and the second inflow/outflow port.