Evaporative recirculation cooling water system, method of operating an evaporative recirculation cooling water system and a method of operating a water deionizing system

Abstract

An evaporative recirculation cooling water system, the system having a recirculation loop to recirculate water through the system, a construction with a space to cool the water in the recirculation loop by evaporation, and a water entry point to allow water into the recirculation loop. The system has a charge barrier flow through capacitor constructed and arranged to remove ions from the water and a dosing system whereby a scale inhibitor is continuously dosed into the inlet flow into the flow through capacitor.

1 . An evaporative recirculation cooling water system comprising:
 a recirculation loop to recirculate water through the system;   a construction with a space to cool the water in the recirculation loop by evaporation;   a water entry point to allow water into the recirculation loop;   a charge barrier flow through capacitor constructed and arranged to remove ions from the water between the water entry point and the recirculation loop; and   a scale inhibitor dosing system downstream of the water entry point and upstream of the charge barrier flow through capacitor to dose a scale inhibitor into the water flow from the water entry point to the charge barrier flow through capacitor.   
     
     
         2 . The system according to  claim 1 , wherein the charge barrier flow through capacitor comprises a charge barrier constructed to substantially allow no transport of weakly dissociated molecules and/or charged molecules with a molecular weight greater than 200. 
     
     
         3 . The system according to  claim 1 , wherein the scale inhibitor dosing system is constructed to dose a scale inhibitor comprising weakly dissociated groups. 
     
     
         4 . The system according to  claim 1 , wherein the scale inhibitor dosing system is constructed to dose a scale inhibitor having a molecular weight between 200 and 20,000. 
     
     
         5 . The system according to  claim 1 , wherein the scale inhibitor dosing system is constructed to dose a charged scale inhibitor. 
     
     
         6 . The system according to  claim 1 , further comprising a sensor to measure a chemical and/or physical property of the water in a waste water output and/or a purified water output and/or the recirculation loop. 
     
     
         7 . The system according to  claim 1 , further comprising a controller configured to control charging and/or discharging of a first and second electrode of the charge barrier flow through capacitor; and control a regulator to direct water to a purified water output during charging of the charge barrier flow through capacitor and to a waste water output during discharging of the charge barrier flow through capacitor, wherein the controller is configured to control a flow adjuster so as to adjust the water velocity in the charge barrier flow through capacitor in response to a function of a chemical and/or physical property of the water in the waste water output and/or the purified water output as measured with a sensor. 
     
     
         8 . The system according to  claim 1 , further comprising a logic circuit configured to calculate a scaling potential of waste water in response to a function of a chemical and/or physical property of the water in a waste water output as measured with a sensor, as well as the water velocity in the charge barrier flow through capacitor. 
     
     
         9 . The system according to  claim 8 , comprising a controller configured to control dosing of the scale inhibitor based on the scaling potential of the waste water as determined by the logic circuit. 
     
     
         10 . The system according to  claim 1 , wherein the scale inhibitor dosing system is constructed to continuously dose a scale inhibitor. 
     
     
         11 . A method of operating an evaporative recirculation cooling water system, the method comprising:
 recirculating water through a recirculation loop of the evaporative recirculation cooling water system;   cooling the water by evaporation;   adding water from a water entry point to the recirculation loop;   removing ions from the water from the water entry point with a charge barrier flow through capacitor; and   dosing a scale inhibitor into the water flow from the water entry point to the charge barrier flow through capacitor.   
     
     
         12 . The method according to  claim 11 , wherein the charge barrier flow through capacitor comprises a charge barrier substantially not allowing transport of weakly dissociated molecules and/or charged molecules with a molecular weight greater than 200. 
     
     
         13 . The system according to  claim 11 , wherein the dosing comprises dosing a scale inhibitor comprising weakly dissociated molecules. 
     
     
         14 . The method according to  claim 11 , wherein the dosing comprises dosing a scale inhibitor having a molecular weight between 200 and 20,000. 
     
     
         15 . The method according to  claim 11 , wherein the dosing comprises dosing a charged scale inhibitor. 
     
     
         16 . The method according to  claim 11 , comprising continuously dosing a scale inhibitor into the water flow. 
     
     
         17 . A method of operating a water deionizing system, the method comprising:
 dosing an amount of scale inhibitor into water upstream of a charge barrier flow through capacitor; and   removing ions from the water with the dosed amount of scale inhibitor by allowing the water to flow through the charge barrier flow through capacitor while charging the charge barrier flow through capacitor and directing the water from the charge barrier flow through capacitor to an outlet after the hardness ions have been removed.   
     
     
         18 . The method according to  claim 17 , wherein the rate of addition of the scale inhibitor is dependent on a scaling potential of a charge barrier flow through capacitor waste water. 
     
     
         19 . The method according to  claim 17 , wherein the rate of addition of the scale inhibitor is dependent on a scale inhibitor concentration in a charge barrier flow through capacitor waste water. 
     
     
         20 . The method according to  claim 17 , wherein the scale inhibitor concentration is between 0.5 and 20 ppm. 
     
     
         21 . The method according to  claim 17 , wherein the dosed scale inhibitor comprise a charged scale inhibitor. 
     
     
         22 . The method according to  claim 17 , wherein the dosed scale inhibitor comprises weakly dissociated groups, and/or has a molecular weight between 200 and 20,000. 
     
     
         23 . The method according to  claim 17 , wherein the scaling potential expressed as LSI is between 1.5 and 4. 
     
     
         24 . The method according to  claim 17 , wherein the charge barrier flow through capacitor is provided between a water entry point and a recirculation loop and the hardness ions are removed from the water of the entry point before the water is provided to the recirculation loop, while leaving the scale inhibitor in the water. 
     
     
         25 . The method according to  claim 17 , further comprising measuring with a sensor a chemical and/or physical property of the water. 
     
     
         26 . The method according to  claim 25 , further comprising:
 controlling charging and/or discharging of a first and second electrode of the charge barrier flow through capacitor with a controller; and   controlling a regulator to direct water to a purified water output during charging of the charge barrier flow through capacitor and to a waste water output during discharging of the charge barrier flow through capacitor with the controller, wherein the controller controls a flow adjuster so as to adjust the water velocity in the charge barrier flow through capacitor in response to a function of the chemical and/or physical property of the water in the waste water output and/or the purified water output as measured with the sensor.   
     
     
         27 . The method according to  claim 17 , further comprising calculating a scaling potential of the waste water in response to a function of a chemical and/or physical property of the water in the waste water output as measured with a sensor, as well as the water velocity in the charge barrier flow through capacitor 
     
     
         28 . The method according to  claim 27 , further comprising controlling the dosing of the scale inhibitor based on the calculated scaling potential.