WATER TREATMENT SYSTEM

Abstract

In a water treatment system, in particular for cooling towers, comprising a fluid basin and a circulation circuit designed to draw a fluid from the fluid basin and subsequently return it again, the circulation circuit comprising an ozone supply device for introducing ozone into the fluid, it is provided that the ozone supply device comprises a swirl chamber reactor and an ozone generator, which is connected to a filter system having an inlet opening for ambient air such that ambient air cleaned by the filter system, in particular substantially pure oxygen, can be fed to the ozone generator for ozone generation.

Claims

1. A water treatment system comprising a fluid basin and a circulation circuit designed to draw a fluid from the fluid basin and subsequently return it again, the circulation circuit comprising an ozone supply device for introducing ozone into the fluid, wherein the ozone supply device comprises a swirl chamber reactor and an ozone generator, that is arranged to introduce ozone into the swirl chamber reactor, wherein the ozone generator is connected to a filter system having an inlet opening for ambient air, wherein the filter system is configured to filter the ambient air to obtain substantially pure oxygen, which is fed to the ozone generator for ozone generation.

2. The water treatment system according to claim 1, wherein the swirl chamber reactor comprises a Laval nozzle.

3. The water treatment system according to claim 1, wherein the swirl chamber reactor comprises at least two fluid intakes.

4. The water treatment system according to claim 1, wherein the circulation circuit comprises a lime filter which is comprised of a microfiltration unit with an exclusion limit of 0.2-1 μm.

5. The water treatment system according to claim 4, wherein the lime filter is disposed downstream of the ozone supply device, viewed in the flow direction.

6. The water treatment system according to claim 1, wherein the circulation circuit is connected to a refeeding line opening into the circulation circuit upstream of the ozone supply device, viewed in the flow direction.

7. The water treatment system according to claim 6, characterized in that the refeeding line comprises a microfiltration with an exclusion limit of preferably <0.2 μm and/or an ozone supply device comprising a swirl chamber reactor.

8. The water treatment system according to claim 1, characterized in that the circulation circuit comprises a bypass line in which the ozone supply device is arranged.

9. A cooling tower comprising a water treatment system according to claim 1.

10. A method for water treatment wherein a fluid is conducted from a fluid basin into a circulation circuit substantially pure ozone is introduced into the fluid in the circulation circuit by means of a swirl chamber reactor, and subsequently the fluid is again returned from the circulation circuit into the fluid basin.

11. The water treatment system according to claim 1, wherein the swirl chamber reactor is spiral-shaped or egg-shaped.

12. The water treatment system according to claim 4, wherein the lime filter is a membrane filter.

Description

[0036] In the following, the invention will be explained in more detail by way of exemplary embodiments schematically illustrated in the drawing. Therein, FIG. 1 depicts a circulation circuit according to the invention; FIG. 2 depicts a first configuration of a swirl chamber reactor; and FIG. 3 depicts a second configuration of a swirl chamber reactor.

[0037] In FIG. 1, a cooling tower is denoted by 1, which comprises a fluid basin 2 on its bottom. A cooling circuit 3 comprises an inlet in the region of the fluid basin 2, through which fluid reaches the cooling circuit 3 and is conducted through a filter 4. After this, the drawn fluid is conducted through a heat exchanger in the refrigerating machine 5, and there is heated by the undesired heat. Further disposed in the cooling circuit 3 is a pump 6 for conveying the fluid within the cooling circuit. The fluid heated by the heat exchanger of the refrigerating machine 5 is sprayed through spraying nozzles 7 in the upper region of the cooling tower 1, thus being cooled and/or partially evaporated. The cooled fluid is returned into the fluid basin 2 and from there can be resupplied to the cooling circuit 3.

[0038] In the fluid basin 2 there is also provided a suction basket 8, through which fluid is conveyed into the circulation circuit 9 for treating the fluid. Two pumps 10 are disposed in the circulation circuit 9 for transporting the fluid. Moreover, a scale filter 11, which is, for instance, designed as a 20 μm filter, is disposed in the circulation circuit 9 to remove scale particles and similar impurities from the fluid. Upstream of the scale filter 11, an ozone supply device comprising a swirl chamber reactor 12, an ozone generator 13 connected to the swirl chamber reactor 12, and a filter system 14 connected to the ozone generator 13 are provided. The filter system 14 comprises a suction opening, through which ambient air can be sucked in. In the filter system 14 are disposed a CO.sub.2 filter and/or an N.sub.2 filter to obtain substantially pure oxygen from the ambient air. The substantially pure oxygen is subsequently supplied to the ozone generator 13, in which substantially pure ozone is produced, which is subsequently supplied to the fluid in the swirl chamber reactor 12. Downstream of the swirl chamber reactor 12, the drawn fluid is supplied back to the fluid basin 2 via the circulation circuit 9.

[0039] Upstream of the swirl chamber reactor 12, moreover, opens the refeeding line 15, which is connected to a fluid reservoir, e.g. a water point, which is not illustrated. The fluid to be refilled is conducted via a microfilter 16 to remove impurities already before the fluid enters the circulation circuit 9.

[0040] For controlling the system, a controller 17 is provided, which is connected to the individual elements via schematically illustrated lines 18. The condition of the cooling fluid is continuously monitored by a temperature sensor 19, a redox sensor 20, a pH sensor 21, a BAC sensor 22 and/or a conductance sensor 23. The redox sensor 20 serves to measure the oxidation potential of the cooling fluid, which is an indicator for the quality of the cool fluid. The BAC sensor measures the bacterial load, an the conductance sensor 23 measures the scale load. The pressure sensors 24 serve to control the cavitation in the swirl chamber reactor 12 by means of the pumps 10. The flow rate controlled, and adapted to the respectively required conditions, by the magnetic valves 25. Moreover, a check valve 26 and a float switch 27 are provided to control the return flow of the fluid into the cooling tower 1.

[0041] FIG. 2 illustrates a swirl chamber reactor 12 according to the invention. The swirl chamber reactor 12 is spirally designed and comprises a swirl chamber 28, two fluid intakes 29 and an outlet pipe 30. The fluid enters the swirl chamber through the two fluid intakes 29 and is conducted along the edge of the swirl chamber 28 in such a manner as to create a swirl running into an entry opening 31 of the outlet pipe 30 (cf. FIG. 3).

[0042] FIG. 3 is a sectional view of the swirl chamber reactor 12 according to FIG. 2. In the region of the entry opening 31 of the outlet 30, a constriction, in particular a Laval nozzle 32, is provided. Moreover, an ozone introduction means 33 is provided in the region of the entry opening 31 of the outlet pipe 30. The fluid enters the swirl chamber 28 through the fluid intakes 29 and is conducted with a schematically indicated spiral motion downwards in the direction to the entry opening 31 of the outlet pipe 30. There, the fluid enters the outlet pipe 30, and the ozone is supplied to the fluid in the region of the Laval nozzle 32 through the ozone introduction means 30. In the region of the Laval nozzle 32 is formed a negative-pressure zone, which has a beneficial effect on the mixing of the ozone with the fluid. After this, the fluid is helically conveyed in the outlet pipe 30 and leaves the swirl chamber reactor 12 again.