DE2340992C2 - Corona reactor with several forcibly cooled corona reactor cells - Google Patents

Description

3. corona reactor according to claim 1 or 2, characterized in that the outer edge of the spacer seal (23) does not in each case extend beyond the circumference of the electrodes

4. corona reactor according to claim 3, characterized in that the spacer seals (23) from consists of a fluorosilicon material

5. corona reactor nacvi one of claims 1 to

holds and which between their inside as well as the opposite The inside of the electrodes forms a gas-tight sealed corona discharge chamber, which are provided with a pressure medium inlet and a pressure medium outlet for the gas to be treated is, further in the corona discharge chamber, a dielectric material between the inner sides the electrodes is arranged

Such a corona reactor is known from DE-OS 20 26 622. The known corona generator contains several cells held together by a jig, which is held together by one under the cells arranged, upward blowing fan are cooled. But it has been shown that it is difficult to get on ! 5 this way to cool all cells at the same time, since the out The air exiting the fan does not have a uniform flow velocity everywhere and therefore some cells are cooled more, some less so that there is a risk of individual cells being thermally

housing (1) a dielectric fluid (24) which is Kcromically overloaded. In addition, for the purpose of mutually reactors (12), appropriate insulation measures are required for the individual cells, with the individual electrodes and the one outside being in a heat exchange relationship. Corona reactor according to claim 1, characterized in order to avoid flashovers, and this insulation signifies that a liquid circuit (5, 6) makes it more expensive to manufacture, assemble and repair between the housing (1) and a cooler (4) carried out with great care.

One also knows from US-PS 14 03 759 an ozone generator whose electrodes are hollow are, the cavities in the electrodes are filled with oil, which may also be circulated for cooling kana This OI has a. the function of a high resistance Resistor, which is connected in series with the corona discharge chamber (for operating the Ozone generator is in this known arrangement

4, characterized in that a direct voltage is used in the corona-Ent- 35). It occurs here however Charge chamber (29) at least t π support body (30) the same difficulties as initially for is arranged, the thickness of which is at least almost that of the arrangement according to DE-OS 20 26 622 was explained-thickness the spacer seal (23) of the same code, since the individual electrodes only against each other rona discharge chamber (29), so as to be isolated by air gaps and to avoid them To keep electrodes (10, 11) at a distance and a rollover at the edges of the electrodes there a more uniform gas flow through the co-insulating layers must be provided, the very to achieve rona discharge chamber (29). are sensitive and during manufacture, assembly and re-

6. Corona reactor according to claim 5, thereby requiring maximum precision and care,
indicates that the at least one support body is also known from US Pat. No. 18 03 600 a (30) each having two flat sides, 45 of which have an ozone generator with a very complicated structure. The ground electrodes used against one of the two inner sides of the electrode are cast parts (10, 11) of the associated corona reactor cell and have cavities that are cooled with water (12), while the high-voltage electrodes are only cooled

7. Corona reactor according to claim 5 or 6, in which the air to be ozonized is cooled. These characterized in that the at least one air flows into a distributor at the top of the ozone generator, Support body (30) approximately between 1/30 and 1/200 from there through slots down between the high des Volume of the corona discharge chamber (29) voltage electrodes, heats up and flows then has in the individual corona discharge chambers that

8. corona reactor according to one of claims 5 to are laterally bounded by two panes of glass. 7, characterized in that the support body (30) 55 will therefore be strongly kühaus the high-voltage electrodes is made of the same material as the Ablen, the result is a low ozone concentration;

but if one wishes to obtain a high ozone concentration, then air cooling is necessary bad In addition, the same insulation problems described at the beginning also occur here the individual electrodes and make it necessary

The invention relates to a corona generator with borrowed that the already mentioned, serving for insulation several forced-cooled corona reactor cells, glass panes laterally considerably over the edges of which are arranged in a housing and each protrude electrodes. However, this makes assembly two spaced-apart, flat 65 and repair in the same way more difficult.
Have electrodes between which in the area DE-AS 10 82 886 shows two variants of an Ozo-

their periphery is arranged a spacer seal, nisators, which are two concentric to each other which have the electrodes in a predetermined distance hollow electrodes, the interior of a

Stand seal (23).

liquid cooling medium (Saizsole or transformer oil) is flowed through Since the electrodes are also only isolated from each other by air gaps, the inner one is Electrode in each case designed as a semiconductor and longer than the outer electrode, this should evidently a more favorable potential distribution can be achieved at the edges. But this is at the expense of performance of such a corona generator. In addition, the cooling devices are very complicated and require a very high effort for assembly and maintenance.

It is therefore an object of the invention to provide a corona generator which has a simple structure, the cells of which are effectively cooled, in which Flashovers between live parts of different potentials can be avoided, and which one is able to deliver larger amounts of ozone.

This object is achieved by the measures specified in claim 1. It is very easy to achieve Way two things:

a) the individual cells are very effective and thanks to the dielectric fluid evenly cooled, so that the temperature differences between the individual cells are only very great are small and all cells can be operated with relatively high power;

b) at the edges of the electrodes the dielectric liquid acts as an insulator and prevents Flashes without special solid dielectrics having to be provided for this purpose

The individual cells can thereby, as they are closed on all sides are operated with an overpressure of at least 0_ 2.1 bar, which means that even with eventual Leaks is reliably avoided that dielectric liquid penetrates into the interior of the cells

The present invention thus solves a problem which the professional world had known for many years, in a surprisingly simple and elegant way Way.

In a further embodiment of the invention, this is advantageously used to improve the cooling before that a liquid circuit is provided between the housing and a cooler

A particularly advantageous embodiment is also characterized in that the outer edge of the The spacer seal does not extend beyond the circumference of the electrode in each case. This considerably simplifies assembly and any repairs, since the spacer seals do not need to protrude and consequently the electrodes of the cells lightly on their Edges can be supported. With regard to the resistance of the spacer seals, there is one Very advantageous solution in which the spacer seals are made of a fluorosilicone material.

When using the at least one support body according to claim 5, it is advantageous that with the same electrical power requirement generates significantly more ozone The support body is expedient designed as a cylinder with a circular cross-section in the initial state

The formation of the at least one support body according to claim 6 ensures secure positioning and supporting effect of the support body with respect to the associated electrodes.

The volume ratios according to claim 7 are effective has a positive effect on the yield of the corona reactor.

The choice of material according to claim 8 ensures trouble-free operation.

The invention is explained in more detail below with reference to the exemplary embodiment shown in the drawings Explained it show:

F i g. 1 shows a top view, partly only shown schematically, of a corona reactor immersed in an insulating liquid, and FIG
F i g. 2 shows a partial section through immersed neighboring corona reactor cells.

In the case of the corona reactor according to FIGS. 1 and 2 are corona reactor cells 12 entirely dielectric Liquid 24, e.g. transformer oil, immersed This liquid has two functions: It cools the

Electrodes 10 and 11, and it prevents flashover between the edges of the electrodea

Before the system immersed in liquid is described in detail, a few preliminary remarks seem appropriate. The corona reactor according to DE-OS 20 26 622 already has the advantage that it can generate large amounts of highly concentrated ozone, all that is required is Ziisngskühlung with air and not the cumbersome and very expensive water cooling as with the "heat-limited" ozone generators according to the prior art. However, since the corona reactor according to the invention - unlike the commercial ozone generators according to the prior art - is not "heat limited", the cells according to the invention can between about 1.4 and 4.5 kp

Generate 3ύ ozone per day per cell, being about 12 to Consume 16 liters of coolant per minute and cell. Because of their higher heat capacity can naturally a liquid dissipates far more heat from the cells than a gas. In the system according to the However, the present invention does not use the liquid that is best for heat transfer suitable, but according to the invention a dielectric, So insulating liquid is used, which has the additional advantage that this liquid

Also prevent a flashover between the two electrode edges of the individual cells can. This insulating function makes it possible to manufacture the cells more cheaply than before, as the special, measures required so far, e.g. B. glass plates,

can be omitted to prevent overturning, which naturally require special care in processing and assembly.

The F i g. 1 and 2 show an immersed in an insulating liquid with a housing 1, which is preferably is made of stainless steel, a corona reactor core 2, which is suitably in a Core chamber 3 of the housing 1 is arranged, a cooler 4, a pump S and the necessary pipelines 6. The system also has a supply line 7 for supplying an oxygen-containing gas and an outlet line 8 for ozone-containing gas p.uf. A suitable electrical connection line 9 penetrates the wall of the housing 1 and is connected to the electrodes 10 and 11 (Fig. 2) of the individual corona reactor cells 12 of the core 2 connected.

The cooler 4 is a suitable heat exchanger, e.g. B. of the kind used for car radiators; a fan is preferably assigned to it. The pump 5 is of suitable design and therefore does not need to be described in more detail.

The core 2 preferably has two modules or assemblies 13 and 14, each of which has several Contains cells 12, which alternate with corrugated

Spacers IS and 16 are arranged, for. B. in the in the DE-OS 20 26 622 type shown. To avoid lengths in the description and drawing shows For example, Fig. 1 does not show all of the details of the spacers 15, 16 between the individual cells 12, not shown guide plates or the like. Can in the core chamber 3 are arranged to direct the flow of cooling insulating liquid through channels 17 and 18 into the To guide spacers 15, 16. The gas connections to the individual cells 12 can essentially be designed in this way be, as described in DE-OS 20 26 622. The feed line 7 is connected to a feed manifold 19 and the outlet line 8 is connected to an outlet manifold 20. Each corona reactor cell 12 has an inlet pipe 21 connected to the supply manifold 19 and one with the Outlet manifold 20 connected outlet pipe 22, as also described in DE-OS 20 26 622 is

Like F i g. 2 shows, the cells 12 are identical to those described in DE-OS 20 26 622 air-cooled Cells with the exception that the glass-silicone rubber spacer seal there, which has the shape of a picture frame and serves as both a seal and a spacer functions between the electrodes of each cell, in which the liquid-cooled cell 12 is replaced by a one-piece circumferential spacer seal 23 made of fluorosilicone rubber, which also has these images The frame shape has a glass core in the spacer seal 23 not required to control the rollover between the electrodes 10, 11, since the insulating liquid 24, e.g. B. transformer oil or a dielectric silicone fluid, this task takes over instead of silicone rubber as in the air-cooled version is preferred here We use fluorosilicone because it has a better resistance to transformer oil Other suitable materials can also be used for the spacer seal 23 and 26 weld bead-like seals made of a suitable sealing means are designated, which from the outside arranged between dielectric coatings 27 and 28 of the electrodes 10, 11 and the spacer seal 23 are.

The preferred insulating fluid is transformer oil with a dielectric constant of about 3. Of course, other insulating liquids available on the market can also be used, e.g. B. insulating Silicone fluids.

A corona discharge chamber 24 is defined within the spacer seal 23 and the coatings 27, 28, in which a support body 30 is arranged for central support. In the case of the cell 12 immersed in oil, this support body 30 is preferably made from fluorosilicone rubber. The support body 30 should have the same thickness as the outer spacer seal 23.

The support body 30 is preferably arranged in the center of the corona discharge chamber 29, is expediently designed as a cylinder with a circular cross-section and, in the case of a cell 12 with an area of approximately 322 cm ^{2, can} expediently have a diameter of

ts of the order of about 1.9 cm. If such a support body 30 is installed, it is produced Cell 12 unexpectedly has significantly more ozone with the same power requirement; this is presumably the consequence of a more uniform, i.e. stronger lami-

M naren or uniform gas flow through the corona discharge chamber without eddies or other disturbances or irregularities in the flow. The support body 30 also helps to keep the electrodes 10, 11 parallel to one another when the pressure in the corona discharge chamber 29 is less than its ambient pressure. The support body 30 can have other shapes, can be larger or smaller, and instead of one support body 30, several can also be used. It has been shown that the volume of the support body should be approximately between 1/30 and 1/200 of the volume of the corona discharge chamber 29, the value 1 It 00 being a preferred value

Although the preferred application is the production of ozone, other reaction fluids can also be fed into the corona reactor core 2 and subjected to a corona reaction in order to produce other reaction products in a manner known per se.
Furthermore, it is not necessary for both electrodes 10 and 11 to be provided with the dielectric coating 27, 28; one electrode can be provided with a dielectric coating and the other electrode can be exposed, but this is at the expense of the ozone yield

The type and composition of the coatings 27, 28 are

in detail from the applicant's earlier application P 22 22 300.3-41.

1 sheet of drawings

Claims (1)

Patent claims: 1. Corona reactor with several forcibly cooled corona reactor cells, which are arranged in a housing and each have two flat electrodes arranged at a distance from one another, between which a spacer seal is arranged in the area of their periphery, which the electrodes holds at a predetermined distance, and which between their inside as well as the opposite Inside the electrodes forms a gas-tight sealed corona discharge chamber, which is provided with a pressure medium inlet and a pressure medium outlet for the gas to be treated is provided, further being in the corona discharge chamber a dielectric material is arranged between the inner sides of the electrodes, characterized in that