Seawater desalination apparatus

摘要

According to one embodiment, a seawater desalination apparatus includes a pressure sensor configured to measure a pressure of seawater which is supplied to a reverse osmosis membrane that is configured to separate seawater into fresh water and condensed seawater and to discharge the fresh water and the condensed seawater, a sensor configured to measure a flow amount of the fresh water which is discharged from the reverse osmosis membrane, a sensor configured to measure a flow amount of the condensed seawater discharged from the reverse osmosis membrane or a flow amount of the seawater discharged from a booster pump, a sensor configured to measure a flow amount of the seawater which is supplied to a power recovery device, and a controller configured to execute control based on values measured by the sensors.

主权项

1. A seawater desalination apparatus comprising:
a reverse osmosis membrane configured to separate seawater into fresh water and condensed seawater and to discharge the fresh water and the condensed seawater; a high-pressure pump configured to feed seawater to the reverse osmosis membrane; a power recovery device to which the seawater and the condensed seawater discharged from the reverse osmosis membrane are supplied, and which is configured to discharge the seawater at a high pressure by pressure energy recovered from the condensed seawater and to exhaust the condensed seawater at a low pressure; a booster pump configured to boost the seawater discharged from the power recovery device up to a pressure equal to a pressure of the seawater discharged from the high-pressure pump, and to discharge the boosted seawater such that the boosted seawater mixes in the seawater which is discharged from the high-pressure pump; an exhaust valve configured to control an amount of the condensed seawater which is discharged from the power recovery device; a pressure sensor configured to measure a pressure of the seawater which is supplied to the reverse osmosis membrane; a first flow-amount sensor configured to measure a flow amount of the fresh water which is discharged from the reverse osmosis membrane; a second flow-amount sensor configured to measure a flow amount of the condensed seawater discharged from the reverse osmosis membrane or a flow amount of the seawater discharged from the booster pump; a third flow-amount sensor configured to measure a flow amount of the seawater which is supplied to the power recovery device; a controller that:
controls a number of revolutions of the high-pressure pump, based on values measured by the pressure sensor and the first flow-amount sensor,controls a number of revolutions of the booster pump, based on a value measured by the second flow-amount sensor,controls a valve opening degree of the exhaust valve, based on values measured by the second flow-amount sensor and the third flow-amount sensor, andcontrols the number of revolutions of the booster pump and the valve opening degree of the exhaust valve in such a manner that a difference between the flow amount of the condensed seawater supplied from the reverse osmosis membrane to the power recovery device and the flow amount of the seawater supplied to the power recovery device becomes a predetermined value, wherein the predetermined value is the power consumption of the power recovery device; a thermometer configured to measure a temperature of seawater supplied to the high-pressure pump and the power recovery device; an electrical conductivity meter configured to measure an electrical conductivity of the seawater supplied to the high-pressure pump and the power recovery device; a pH meter configured to measure a pH of the seawater which is supplied to the high-pressure pump and the power recovery device, and a setting module that:
sets a target flow amount of the booster pump and a recovery ratio, based on values measured by the thermometer and the electrical conductivity meter,delivers the target flow amount and the recovery ratio to the controller, andcorrects the target flow amount and the recovery ratio, based on a value measured by the pH meter.