Gas and liquid contact apparatus – Contact devices – Injector type
Patent
1997-03-19
1998-08-25
Miles, Tim R.
Gas and liquid contact apparatus
Contact devices
Injector type
261DIG75, B01F 304
Patent
active
057980616
DESCRIPTION:
BRIEF SUMMARY
This application is the U.S. national-phase application of PCT International Application No. PCT/DE95/00451.
BACKGROUND OF THE INVENTION
The invention relates to a device for mixing two fluids, of which at least one is a liquid.
"Fluids" for the purposes of the invention are liquids and gases. The device can be used for mixing a liquid with a gas or for mixing two mutually insoluble liquids or for mixing or homogenization of two mutually soluble liquids. The following details apply, representatively, also for the other two possibilities to the mixing of a liquid with a gas.
Such "mixing" is done, for example, in waste water treatment when as much oxygen as possible is to be introduced into the water, the oxygen being poorly soluble in water. To do this it is necessary, as in chemical reactions and in absorption and desorption processes between a gas and a liquid, to create a large mass exchange surface between the two fluids with high turbulence. The mass exchange between the gas and liquid is thus intensified.
With the known device according to DE 38 18 991 C1 mass exchange is further improved during mixing of fluids. The gas is broken up into very small bubbles as it emerges from the nozzles by the shear field of the liquid in the immediate region behind the openings of the nozzles. At the same time, from the interior of the vessel each liquid jet emerging from the nozzles sucks in liquid or a gas-liquid mixture. In this way, behind the nozzles homogeneous two-phase flows form. The two two-phase flows are routed such that they collide in the impact zone within the vessel. There the gas bubbles are further broken up and the kinetic energy of the flowing gas-liquid mixture is dissipated. In this way high turbulence and a large mass exchange surface in the impact zone as well as in the other parts of the vessel are produced above and below the impact zone.
The problem to be solved is to provide a simple structure for the device described above.
SUMMARY OF THE INVENTION
This device according to the present invention is made in one piece with the tube and guide channel. It can be produced in a compact construction and is therefore easy to handle. For this reason the device can be used, for example, also as an immersion assembly for large volume liquid tanks, in addition to its direct use as a mixing device.
The guide channel is made simply since the wall of the tube which is present anyway is used for its construction. Therefore only the second walls of the guide channel each need to be positioned inside or outside the tube and need to be securely joined to the tube.
In this case, for each nozzle used in the device a type of its own guide tube can be mounted. However, it is also possible to provide an annular guide channel with a correspondingly large number of nozzles.
Other advantageous embodiments of the invention involve the use of a dual cavity guide channel each bordered by half-pipes located outside of the tube, two cavities bordered by U-shape hollow sections located outside of but connected to the wall of the tube, use of a pipe piece concentric to and supported by the tube, integration of a gas supply pipe into the nozzles, and use of the device as an immersion assembly for a large volume liquid tank.
Embodiments of the subject matter of the invention are described in the drawings.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
FIG. 1 shows a schematic view of a device according to the invention.
FIG. 2 shows a top view of the device.
FIG. 3 shows a side view of the device.
FIG. 4 shows an embodiment of the device which is modified compared to FIG. 2.
FIG. 5 shows a nozzle which can be used in the device in an enlarged representation.
FIG. 6 shows one application for the device.
FIG. 7 shows a prior art device.
DETAILED DESCRIPTION OF THE INVENTION
In the following description the device according to the invention is further described for the mixing of a liquid with a gas. In the same way, however, the device can also be used for mixing two mutually insoluble liquids or for homog
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patent: 4906363 (1990-03-01), Makino et al.
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Air Products and Chemicals Inc.
Miles Tim R.
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