| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a seawater desalination device and a method for controlling same, which set appropriate driving conditions in a two-step RO (reverse osmosis) desalination process, and reduce the amount of electric power. <P>SOLUTION: The seawater desalination device has: a high pressure RO membrane filter 4 that separates seawater into a permeate and a concentrate; a high pressure pump P1; a power recovery device 5; a high pressure RO membrane recovery rate adjustment valve V5 that adjusts the flow rate of concentrate discharged from the power recovery device; a first flow meter Q1 that measures the flow rate of concentrated discharged from the power recovery device; a low pressure RO membrane filter 7 that separates the high pressure RO membrane permeate into a permeate and a concentrate; a low pressure pump P2; a low pressure RO membrane recovery rate adjustment valve V6 that adjusts the flow rate of concentrate discharged from the low pressure RO membrane filter; a second flow meter Q2 that measures the flow rate of concentrate discharged from the low pressure RO membrane filter; a thermometer 21 that measures the temperature of the seawater supplied to the high pressure RO membrane filter; an electrical conductivity meter 22 that measures the electrical conductivity of the seawater supplied to the high pressure RO membrane filter; and control units 11, 12 that respectively adjust the degree of valve opening of the two adjustment valves V5, V6 on the basis of the measured two flow rates and electrical conductivity and temperature of the seawater. <P>COPYRIGHT: (C)2013,JPO&INPIT |
