DE102013008906A1 - UV thin film for liquid fluids / liquids - Google Patents

Abstract

The invention relates to a UV thin-film reactor (99) for treating transparent to very cloudy liquids / liquid fluids. The essential idea of the invention is to present the UV source (1) with a thin, constantly renewing, large surface of the liquid to be treated or to form it. In this way, complex filtration can be dispensed with in a large number of applications. For example, with cooling lubricant (KSS) emulsions, the existing particle / macrofiltration is usually sufficient. Even with low transmission <10 μm, the liquid fluid flowing through the UV thin-layer reactor (99) is optimally treated. Cooling lubricant and other cloudy liquid fluids can be kept as sterile as possible.

Description

The present invention relates to a UV thin-film reactor having at least one UV source, a reflector layer attached to the housing wall and a grid construction attached to the reflector wall for fluid guidance and forced mixing.

The reflector layer and the grid construction can be provided with bioactive and / or catalytic properties depending on the application requirements.

State of the art

The field of application for UV reactors is very wide and depends on the operational-hygienic or food-technological requirements of the respective application.

UV reactors are suitable for. B. to treat fluid flowing through a variety of ways. Main tasks are the UV sterilization and UVC disinfection of z. Legionella, EHEC, pseudomonads, coliform bacteria, noroviruses, polio viruses, algae, yeasts and fungi in water and watery, cloudy liquid fluids.

The areas of application extend to the food and beverage industry, especially vegetable and salad washing processes, agriculture and animal breeding, fish farming, many types of process fluids in the industry but also in the spa, clinics, schools, sports facilities and a variety of other areas, de facto all life and work areas in which hygienic standards must be adhered to.

A major disadvantage of most known UV systems is that a reliable mixing of the liquid fluid during the flow mostly omitted.

This is mainly due to the fact that the distance to be treated from the protective tube / dip tube to the reflector wall is usually several centimeters and therefore too strong for sufficient transmission.

The transmission is also inadequate for the most part because particles present in the fluid generate shadows over the relatively wide range of UV radiation. Therefore, liquid fluids are poorly disinfectable even with low turbidity. For this reason, most liquids must be filtered before UV treatment.

Task:

The object of the present invention is to provide improved UV reactors over the prior art.

These should ensure optimum mixing of the liquid fluids to be treated.

The fluid film to be penetrated by the UV radiation should be kept as thin as possible.

The surface presented to the UV source should constantly be redesigned.

The materials used should be suitable for bioactive and catalytic coatings.

The UV reactor should be suitable for clear to very cloudy liquid fluids.

The UV reactor should be inexpensive to produce and as easy to use.

In particular, the UV reactor should be suitable for the treatment of sensitive liquid fluids such as in the food industry.

The object is achieved by a UV reactor having the features of claim 1.

Description:

The essential idea of the invention is to offer the UV source a thin, constantly renewing, large surface or to form it. As a result, the UV performance is used much better and the effect is improved.

The UV reactor can be used without restrictions for all applications, in particular for the treatment of sensitive and cloudy liquid fluids in industry and food.

It is essential that the UV source is placed freestanding in the middle of a housing without direct contact with the fluid.

The UV radiation source can be used in all UV-effective wavelengths of z. B. <185 nm to> 400 nm are designed.

The UV reactor is flowed through vertically.

Advantageously, the fluid supply in the reactor cover is designed so that the fluid flow is distributed radially evenly to the reactor wall. The freely selectable gap between the fluid guide and the reactor wall in conjunction with the fluid supply, the fluid flow is distributed evenly on the UV reactor wall.

In a particularly advantageous embodiment variant, a tissue is attached to the reactor wall in a form-fitting manner with a selective support on the UV reactor wall.

It is essential that the fabric is designed so that it comes only to selective contacts to the reactor wall and identifies the adjacent fabric mesh a defined space to the reactor wall, z. Square mesh fabric in linen weave or other fabric types with similar properties.

Advantageously, z. As wire size, mesh size, bond, fabric thickness and geometry, the fluid turbulent are guided past the UV source vertically at almost constant speed.

Due to the choice of fabric, an extremely turbulent flow occurs both horizontally and vertically. The fluid is passed through the tissue reliably and without splash on the reactor wall. An example of the inventive UV thin-film reactor Inner diameter 319 mm active reactor length 1,000 mm Durchström- / falling speed 1.0 m / s Throughput at 1.0 mm fluid thickness 3.6 m ³ / h

In the example shown, significantly more than 200 different, constantly redesigned surfaces are presented to the UV radiation source.

Even with a minimum transmission of <10 μm per surface area shown, the fluid to be treated is treated reliably and efficiently throughout the fluid thickness / film thickness.

In a particularly advantageous embodiment variant, the UV reflector surface and the tissue lying in front of it are provided with a bioactive or catalytic coating.

In a further embodiment, the properties of the coating types are combined: z. As the reflector surface is catalytically coated and the tissue bioactive or vice versa depending on the task.

It has been found that ultraviolet radiators hardly have a drop in performance over a distance of 200 mm through air and strike the fluid guided on the reactor wall with almost undiminished power. Due to this physical property, UV reactors with a diameter> 400 mm can be manufactured.

In this embodiment> 400 mm UV lamps are mounted off-center in the lid of the reactor off-center at a distance of 200 mm to the reactor wall instead of the UV source mounted centrally in the UV reactor. It can be attached 3.6 or more UV lamps. The size of this embodiment is dependent solely on economic considerations.

Due to the fluid thinning and the permanent realignment of the fluid surface, the inventive UV thin film reactor allows high flow rates at comparable UV power or a comparable flow rate at reduced UV power.

For the first time, cloudy and medium-viscosity liquid fluids without prefiltration can be treated reliably with the UV thin-film reactor according to the invention.

The illustrated UV thin-film reactor is operated without pressure with free outlet.

LIST OF REFERENCE NUMBERS

99

UV film reactor

1

Spotlights / UV source

2

Dip tube / thermowell

3

Housing / housing shell

4

Reflector insert / reactor wall / reflector wall / reflector surface

5

Fabric / mesh

25

Fabric / mesh

6

fluid guide

7

head segment

8th

Source holder

9

fluid inlet

10

Fluid distribution / clearance

11

Ventilation / emergency overflow

12

sloping floor

13

fluid flow

14

caseback

15

Leveling feet

16

Cover screw connection to the housing jacket

26

UV control

30

reflector leadership

Characters:

The invention will be explained in more detail with reference to the following figures:
The illustrated embodiments are not intended to be limiting, but merely to illustrate an embodiment of the invention. The illustrated fluid guide of the inventive UV thin-film reactor can in principle be made in all suitable materials and geometries in square or rectangular design.

Show it:

1 : an inventive UV thin film reactor in a first embodiment,

2 : a schematic representation of all relevant UV-exposed parts with housing, housing shell in section AB,

3 : an embodiment variant according to the invention of the reflector layer with fabric / grid in the section AB,

4 : a schematic representation of possible tissue / grid inserts,

5 : a schematic representation of a head segment with all essential parts in the section AB,

6 : a head segment in top view.

1 shows a erfindergemäßen UV thin film reactor 99 in a sectional view with a dip tube / protective tube 2 a UV source / emitter 1 who also like in 2 shown from a reflector insert 4 and a fabric / grid 5 is formed (compare 3 or 4 ).

The UV source 1 with the protective tube 2 is freestanding on the spotlight bracket in this version 8th at the head segment 7 arranged.

The described embodiment of housing jacket 3 , the case back 14 , the sloping floor 12 , the fluid outlet 13 and the head segment 7 are designed in suitable polymer design.

Only the UV radiation offered surfaces such as reflector insert 4 , the tissue 5 and the fluid guide 6 are designed as VA or aluminum reflector.

The described embodiment can also be made without polymer components made of VA or aluminum. In this embodiment is on the mobile reflector insert 4 waived. The reflector layer is in this embodiment directly on the inner housing shell 3 applied.

The erfindergemäßen UV thin film reactor 99 has on the fluid inlet side of the head segment 7 on. The head segment 7 is by-pass-safe by screws or a suitable quick clamping with the housing shell 3 connected.

In 5 and 6 will the fluid supply 9 , the spotlight holder 8th , the vent line also forced overflow 11 and the fluid guide 6 clear.

The 1 . 2 . 3 . 5 and 6 show a cylindrical design.

The fluid to be treated is transferred via the head segment 7 through the fluid inlets 9 and the fluid guide 6 in the head segment 7 distributed.

The uniform distribution to the reactor feed 4 is due to the variable fluid distribution 10 given. The gap 10 to the reactor 4 can be freely selected from <1 mm to> 5 mm according to the task.

At the reactor wall / reflector wall 4 is form-fitting circulating over the entire length of the protective tube 2 a tissue similar 4 appropriate.

The tissues 5 / 25 can be adapted to the field of application in mesh size, bond and fabric thickness.

The tissues / mesh 5 / 25 can be designed so that also forms a radial flow for the main vertical flow.

The erfindergemäße UV thin film reactor 99 is vertically flowed through vertically from top to bottom. The fluid outlet 13 is depressurized.

The 3 and 4 clarify the basic idea of the fluid guide on the reactor wall 4 ,

Due to the geometry of the fabric / grid 5 / 25 the fluid to be treated is splash-free on the reactor wall 4 guided. Due to the punctiform positive connection, the fluid on the reactor wall 4 constantly swirled and the UV source 1 presented a redesigned interface.

In addition to the described embodiment with a freestanding, not fluid wetted UV source 1 / 2 can also be a fabric / grid 5 / 25 positive fit the dip tube 2 enclose and form fit on the reactor wall 4 connect.

All fluid wetted surfaces the reactor wall 4 , the fabric / grid 5 / 25 and the fluid guide 6 may be provided with a bioactive or catalytically active coating. Combinations of bioactive and catalytically active coatings in a UV thin-film reactor 99 are feasible depending on the task.

The invention is not limited to the exemplary embodiments described, but also encompasses all other equally effective embodiments.

For example, a UV thin-film reactor is also conceivable 99 for throughputs> 200 m3 / h built on a rectangular base with plane-parallel fluid guide walls 6 with a plurality of spaced-apart radiation sources 1 ,

Also, several UV thin film reactors 99 be coupled to a large facility.

Claims (10)

UV thin-film reactor ( 99 ) for the treatment of transparent to turbid liquids with at least one centrally positioned UV source ( 1 ), a spaced reflector layer ( 4 ) and a tissue / grid ( 5 ) ( 25 ) to the reflector layer ( 4 ) is arranged positively, wherein - the type of tissue ( 5 ) ( 25 ) varies depending on the task, - the diameters of the thin-film reactors ( 99 ) are variable, - a cylindrical design of the thin-film reactor ( 99 ), - the wavelength of the UV source ( 1 ) from <185 to> 365 nm, - the UV source ( 1 ) z. B. has a main emission of 254 nm and a second main emission of 185 nm - the main emission of 254 nm to 185 nm with a UV source ( 1 ) is made variable, for example in the ratio 1/5 185 nm to 4/5 254 nm, - the choice of tissue and arrangement ( 5 ) ( 25 ) allow a radial acceleration, characterized in that the tissues / grids ( 5 ) ( 25 ) and the reactor wall / reflector wall ( 4 ) is coated catalytically or bioactively. UV thin-film reactor ( 99 ) according to claim 1, characterized in that in a UV thin-film reactor ( 99 ) a combination of catalytic and bioactive coating is possible. UV thin-film reactor ( 99 ) according to claim 1 or claim 2, characterized in that the types of fabric / grid ( 5 ) ( 25 ) may have a mesh size of <1 mm to> 10 mm. UV thin-film reactor ( 99 ) according to one of claims 1 to 3, characterized in that the tissue thickness of <0.5 mm can be up to> 5 mm. UV thin-film reactor ( 99 ) according to claims 1 to 4, characterized in that by the tissue selection ( 5 ) ( 25 ) a fluid mixing is so efficient that a transmission <10 microns is sufficient to treat even very cloudy fluid completely. UV thin-film reactor ( 99 ) according to one of claims 1 to 5, characterized in that a plurality of reactors ( 99 ) are merged into a compact system. UV thin-film reactor ( 99 ) according to claims 1 to 6, characterized in that the tissue / grid ( 5 ) ( 25 ) the dip tube ( 2 ) encloses positively and the reflector insert / the reactor wall ( 4 ) the tissue ( 5 ) ( 25 ) encloses positively. UV thin-film reactor ( 99 ) according to claim 7, characterized in that in this embodiment claim 7 of the UV thin-film reactor ( 99 ) is fully flooded. UV thin-film reactor ( 99 ) according to one of claims 1 to 6, characterized in that by a flat fabric arrangement ( 5 ) ( 25 ) large parallel surfaces with multiple UV sources ( 1 ) are irradiated efficiently. UV thin-film reactor ( 99 ) according to one of claims 1 to 9, characterized in that the tissue / grid ( 5 ) ( 25 ) is formed in waveform.

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