DE9010116U1 - Device for gas dissolution in liquid with gas component enrichment - Google Patents

Description

This case ref.: D 39/13

Device for gas dissolution in liquid with gas component enrichment

The invention relates to a device for dissolving gas in liquid, in which the liquid is continuously pressed through a nozzle plate into a reaction chamber which is partially filled with supplied gas and partially filled with gaseous liquid which is formed therefrom, which is led via a fluid section into a tank from which the solution is to be discharged at the bottom via a drain valve and in which undissolved, separated gas collects.

In a device known in practice, the undissolved separated gas is returned to the reaction chamber until it is completely dissolved. In this way, the composition of the dissolved gas components is exactly the same as in the gas mixture supplied from outside.

>· It is known, for example, that when air or gaseous diatomic oxygen is ozonized, only a small proportion of a few percent of stable ozone is produced, so that when such an ozone-air mixture or ozone-O2-oxygen mixture is dissolved in a liquid, the solution contains much more air or diatomic oxygen than ozone and, in principle, it would be soluble or absorbable in it. The oxidizing and sterilizing effect of such a solution and the oxidizing effect on substances contained in the solution, e.g. organic components and suspended matter, is therefore limited.

t · ! ■ · 1

It is an object of the invention to disclose a device with which it is possible to produce a gas solution in a liquid which has a different gas component ratio than the supplied gas mixture.

The solution to the problem is that the unsolved,

separated gas from the tank room is to be discharged via a gas outlet valve.

Advantageous embodiments are specified in the subclaims ■L· .

In an advantageous embodiment, the resulting solution is repeatedly recirculated to the nozzle plate and mixed again with the freshly supplied gas mixture in the reaction chamber.

The multiple circulation of the gas solution results in an ever greater saturation of the same, even with gases contained in the gas phase to a lesser extent, until the solubility of the individual gases in the liquid is reached.

If, for example, water in the device according to the invention is exposed to air that contains only about 20% oxygen, undissolved excess nitrogen is preferentially released from the tank and, after several circulations of the solution, a high oxygen enrichment is achieved corresponding to twice the oxygen solubility compared to the nitrogen solubility under normal conditions. Nitrogen saturation is thus reached about ten times sooner when air is added than oxygen saturation.

In the case of an ozone-O2 mixture which usually contains up to about 4% ozone coming from a generator, it is advantageous to return the diatomic oxygen remaining after the ozone has been removed to the ozonation device. The ozone-O2-O2 concentration ratio in the liquid increases approximately proportionally to the number of cycles of the solution until saturation with both gases. Saturation with the diatomic oxygen is almost reached in the first cycle if the previously known device is used, and ozone saturation only occurs after many cycles, e.g. 25, as can be seen from the gaseous gas components and the solubilities of the two gases.

In another operating mode of the device, it is intended to work with a single pass or only a few passes of the liquid or solution and with a high gas surplus. For this purpose, a relatively long reaction section, e.g. 5 to 10 times longer, is advantageously arranged downstream of the reaction chamber, in which further turbulent mixing and thus an increased dissolution of a component contained in a small amount in the supplied gas takes place. In the case of ozone, its higher dissolving capacity is advantageously used here.

A further advantageous embodiment is provided by the cascading of several reactors and tank rooms, each with an intermediate pump and with a supply of the gas mixture to each reactor.

The gas can be introduced into the reactor under pressure through a separate inlet into the reaction chamber or by means of an injector nozzle in front of the liquid pump or through the

Injector effect of the liquid jets behind the nozzle plate. In this way, for example, the separated oxygen can be recirculated via an ozonizer to the reaction chamber without the need for a gas pump.

The entire device works at an increased pressure in order to take advantage of the better gas solubility and to achieve a predetermined degree of supersaturation of the solution released. The outlet valve is controlled to open so that after the tank space is filled to a predetermined level, this level is maintained. The separated, excess gas is discharged while maintaining the predetermined reaction pressure. The fresh gas supply is proportional to the liquid supply or dependent on the signal of a gas saturation meter or an oxidation potential meter arranged at the outlet of the device as soon as continuous, approximately constant operation has been established.

Advantageous designs are shown in Figures 1 and 2.

Fig. 1 shows a side view of a

Gas release device, partially opened in axial cross-section, partially schematic;

Fig. 2 shows a cascade arrangement of release devices.

Fig. 1 shows a reaction chamber (1) to which a liquid (FI) is fed on the inlet side through a nozzle plate (11), whose emerging jets act as injector jets for the supplied gas (GO). From the reaction chamber (1) the solution-gas mixture (LG) is driven through a mixing section (2) which is approximately 5 times the length of the

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reaction chamber (1) and is so narrow that turbulence occurs. This mixing section (2) is preferably laid in the direction of flow first downwards and then upwards in the tank chamber (3), so that its outlet opening (21) is located in the upper area of the same. The tank chamber (3) has a volume several times the volume of the reaction chamber (1), so that the gas solution mixture (GL) can circulate for a longer period of time and the solution (L) collects at the bottom. The separated gas (G1) is led from the top of the tank chamber (3) into a gas container (4) which is at the level of the reaction chamber (2). Solution driven into the gas container (4), for example by liquid bubbles, can flow out into the tank chamber (3) through a return pipe (41) at the bottom. In the gas container (4) there is a level sensor (42) which controls the drain valve (5) located at the bottom of the tank chamber (3) and/or the gas outlet valve (43) via a control device (R). At the drain (51) of the tank chamber (3) there is a gas saturation sensor (52) which controls the inlet valve (10) for fresh liquid (PO).

The fresh liquid (FO) is supplied under pressure from the outside and, if recirculation of the solution (L) is planned, is preferably mixed with this solution (L) on the pressure side of the recirculation pump (6) and together with it is supplied to the nozzle plate (11). The suction side of the recirculation pump (6) is connected to the bottom of the tank chamber (3), so that the pump (6) only has to overcome the pressure drop at the nozzle plate (11) and in the mixing section (2). A check valve (61) blocks the recirculation path when the pump (6) is not in operation, which is the case, for example, when the tank is first filled.

The separated gas (GI) is released to the outside behind the gas outlet valve (43), depending on the position of a switching valve (44), or is led through a gas reactor (7). This is, for example, an ozone reactor in which the gas (GI), which consists mainly of diatomic oxygen, is irradiated with UV light. The gas to be supplied (GO), which has been enriched with ozone again, is led through a return valve (1) into the reaction reactor (M), in which the injector effect of the injected liquid (FI) creates a suction. To replace the dissolved gas, a reducing valve (72) is arranged in front of the gas reactor (7), which is set to the specified reaction pressure in each case, so that new gas, e.g. oxygen, constantly flows in from a storage bottle (73) as required, which may be stored in the gas reactor.

(7) is ozonized before it enters the reaction chamber (1).

If instead of oxygen, air is used for ozonation, the separated gas (GI) is released to the outside and fresh air is always supplied to a gas reactor

(8), from which the ozonized air of the liquid flow is preferably fed to an injector nozzle (81) on the suction side of the recirculation pump (6). The gas reactors (7, 8) are provided alternatively.

Fig. 2 shows a cascade arrangement of gas dissolving devices (A, - C), which in the case shown serves to ozonize a liquid (FO). The gradual increase in the dissolved ozone content takes place in the linear passage of the liquid through the dissolving devices connected in series. The freshly supplied liquid (FO) is introduced at high pressure with a first ozonized oxygen stream (GE) into the first reaction chamber (I ¹ ) through the nozzle plate (11'), from which the resulting

first mixture (Ml) flows through the first mixing section (2 ¹ ) into the first tank chamber (3'), from the bottom of which the first solution (LI) is pumped by the first pump (6 ¹ ) into the second

Reaction chamber (1") of the second similar dissolving device _%

(B). From this, the more enriched, f

second solution (L2) into the third similar ^v '

release device (C), at whose tank outlet the ;

finished, highly ozone-enriched solution (L3) via the |

Drain valve (5 ¹ ) drains. . '

The gas (G ¹ , G'', G ¹ ·*) separated in the dissolving devices (a, B, C) is returned from the gas containers (4 ¹ ) to the ozonization device (7 ¹ ), into which the fresh oxygen (GO) is also fed, and from which the ozonized oxygen (GE) is delivered to the three gas dissolving devices (A, - C). The gas can be contained in the ozonation reactor either in just one chamber or can be fed separately, as shown in dash-dot lines, with the gas separated in each case being passed on from stage to stage and ^, from the last stage, supplemented with new oxygen, being returned to the first reaction chamber (1 ¹ ). Float valves and check valves are used in front of and behind the ozonization areas (7A, 7B, 7C) of the gas lines (not shown) to prevent the liquid from penetrating there. The 3-stage cascade shown here, for example, can be constructed with a different number of stages. The type of gas and the gas or ozonation reactor can be freely selected or replaced by another gas source.

Claims (15)

Protection claims 1 * Device for converting a gas solution (CSO) into a ^flow (FI), in which the liquid (FI) is continuously pressed through a nozzle plate (11) into a reaction chamber (1) which is partially filled with continuously supplied gas (GO) and partially with a gas solution formed there, which is led via a mixing section (2) into a tank chamber ( 3), from which the solution (L) is to be discharged at the bottom via a drain valve (5) and in which undissolved, separated gas (GI) collects at the top, characterized in that a discharge line (41, 41a) for the undissolved gas is arranged in the upper region of the tank chamber (3) and that a gas outlet valve (43) is arranged in this discharge line (41, 41a). 2. Device according to claim 1, characterized in that between the bottom area of the reaction chamber (1) and the tank space (3) is provided with a flow section (2) whose length corresponds to a multiple of the reaction space length and whose width is dimensioned such that a turbulent flow occurs. 3. Device according to claim 2, characterized in that the niche section (2) runs approximately halfway downwards and then halfway upwards and ends in the upper tank space area. 4. Device according to one of the preceding claims, characterized in that a gas container (4) is arranged at the top of the tank space (3), which is located at approximately the same height as the reaction space (U), and the controllable gas outlet valve (43) is connected to the top of the gas container (4). 5. Device according to claim 4, characterized in that at the bottom of the gas container (4) a drain pipe KI) is led back into the tank outlet (3). 6. Device according to claim 4 or 5, characterized in that in the gas container &iacgr;·&iacgr;) a Nivesu probe (42) is arranged, which serves to control the drain valve (S) and/or the gas outlet valve (43). .» 7. Device for understanding speech, "<- characterized in that a recirculation pump (6) is connected downstream of the tank chamber (3), which acts on the nozzle plate (1) on the pressure side. 8. Device according to one of the preceding claims, characterized in that a controllable inlet valve (10) for the liquid (FO) to be supplied is arranged on the inlet side, which is controlled by a gas saturation probe (52) which is arranged on the outlet side of the tank space (3*). 9. Device according to one of claims 1 to 8, characterized in that the gas from a compressed gas bottle (73) is supplied to the reaction chamber (1) via a pressure reducing valve (72) directly or via a gas reaction chamber (7). 10. Device according to claim 9, characterized in that the separated gas (GI) is also returned to the reaction space (1) via the gas reaction chamber (7). 11. Device according to claim 9 or 10, characterized in that the supplied gas (GO) is guided into an injector suction area behind the outer plate (11). 12. Device according to one of claims 7 or 8, characterized in that the gas to be supplied is fresh air which is supplied directly or via an ozonation reactor (8) on the suction side of the recirculation pump (6). 13. Device according to one of the preceding claims, characterized in that check valves and/or float valves are arranged on the inlet and/or outlet side of the gas reaction chamber (7) or the ozonization reactor (8) to protect against penetration of the liquid. 14. Device according to one of the preceding claims, characterized in that several of the dissolving devices (A, - C), each consisting of at least one reaction chamber ( ¹¹ ) with a nozzle plate (11'), a tank chamber (3') and a separating gas container (4'), with the interposition of a pump ( ⁶¹ ) are connected in series in such a way that the tank chambers ( ³¹ ) on the outlet side each act on the nozzle plate (11') of the downstream dissolving devices (B, C) via a pump (6*) and the nozzle plate (11*) of the first dissolving device (A) is acted upon with the fresh liquid (FO) and that each of the reaction chambers (1', 1") is supplied with fresh gas or gas prepared in a gas reaction chamber ( ⁷¹ ). 15. Device according to claim 14, characterized in that the separated gas (G', G") of a dissolving device (A, B), separately guided via a gas reaction chamber (7B, 7C), is fed to the respective upstream dissolving devices (B, C) and the separated gas (G" ¹ ) from the last dissolving device (C) is fed together with the supplied fresh gas (FO) via a further gas reaction chamber (7A) to the first upstream dissolving device (A).