DE1245329B - Process for the separation of gaseous and liquid media of different mass inertia, especially isotopes - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

BOId

German KL: 12 e - 6

Number: 1245329

File number: S 73721IV c / 12 e

Filing date: April 28, 1961

Opened on: July 27, 1967

The invention relates to a method for separating gaseous and liquid media of different types Mass inertia, especially of isotopes, using that occurring in a rotary flow Powers.

In the case of such a rotary flow, in the area of a cylindrical vortex chamber close to the wall, a Potential circulating flow generated by being tangential in the vortex chamber jacket and the main flow direction nozzles directed at an angle an additional medium is introduced. This potential circulating flow is inwardly above the mouth of the axial inlet for the media to be separated deflected, forming a vertebral depression. From here a rotational flow arises that circulates within the potential circulation flow and in the axial direction opposite to the potential circulation flow progresses along with the incoming media. The axially entering media are also excited by the effect of the potential circulation flow set in rotation and transferred into the rotational flow. Forms above the vertebral depression now a source of eddy in which by the effect of the centrifugal forces and the rectified Dragging forces the heavier media out of the rotational flow and in a cylinder jacket-shaped Area between potential and rotational flow are enriched. From here Part of the enriched media can be led downwards with a branch of the potential circulation flow and discharged through an outlet for the heavy medium coaxially surrounding the inlet.

It is known to use centrifuges or ultracentrifuges and similar ones for separating isotope mixtures Provide devices in which superimposed velocity or acceleration fields are generated that trigger different forces in particles of different mass. In all of these procedures the speed fields (centrifugal forces) of a simple rotational flow are used. In these Cases, however, it is not a question of a primary excitation of the potential flow as part of an off Potential and rotational flow existing rotary flow with vortex sources and vortex sinks, see above that also not the relative forces occurring in this rotary flow in addition to the normal centrifugal forces the vortex sources are present, which are about a factor of 4 larger than the pure centrifugal forces are. In the case of rotary flow, separating forces can thus be achieved which are greater by a factor of approximately 5 are than those in known separation systems.

Process for separating gaseous and liquid media of different mass inertia, especially of isotopes

Applicant:

Siemens Aktiengesellschaft, Berlin and Munich, Erlangen, Werner-von-Siemens-Str. 50

Named as inventor:

Dipl.-Phys. Dr. rer. nat. Karl-Rudolf Schmidt, Dipl.-Ing. Dr. rer. pole. Karl-Heinz Oehlrich, Gain;

Dipl.-Chem. Dr. rer. nat Hans-Günter Heitmann, Erlangen-Buckenhof

According to the invention, for the separation of gaseous and liquid media, in particular of Isotopes, the medium in each case with a lower mass inertia with the help of one in the common axis of rotation suction device arranged by the potential circulation and rotational flow and at the same time with the axial suction of the component with lower inertia, that in the transition zone Medium of greater inertia brought together between potential circulation and rotational flow with one branch of the potential circulating flow through one concentrically surrounding the media inlet Outlet discharged. This measure achieves a noticeable improvement in the separation effect, because at the same time the lighter component is preferred in the zone of the common axis of rotation of Potential and rotational flow flows in and the heavier component in the boundary layer between both currents is discharged.

The invention is of particular importance for the separation of gas mixtures, such as nitrogen and oxygen, e.g. B. from the air, or from liquid or gaseous isotope mixtures, z. B. a mixture of H ₂ and D ₂ or the uranium isotope mixture in uranium hexafluoride.

The type of excitation of the rotary flow described above can be achieved by means of oblique-tangential injection an auxiliary medium or by stirring devices. In the same way you can also measures to improve flow stability, to improve energy consumption, z. B. by installing flow bodies and baffles

709 618/472

Claims (5)

den, several second air nozzles and means for the removal of false rays are used. Substances of the same or different type as the media to be separated can be used as an auxiliary medium for stimulating the potential circulation flow, but these must be compatible with the main media. The essential features of the invention are to be illustrated in schematic form on the basis of exemplary embodiments. Fig. 1 shows a device according to the invention for separating gas and liquid mixtures. The mixture enters the swirl chamber 2 via the feed pipe 1. The potential flow 4 is excited by a second medium introduced via the nozzles 3, in the present case a mixed flow, inclined-tangentially against the mixed flow entering at 1 (main medium). This primarily excited potential flow 4 splits at point 5 into two flow branches 6 and 7. With the branch 6, the heavier component of the mixture is preferably discharged through the pipe 8 from the device. The branch that changes into a rotational flow 7 arises from the potential flow 4 when this flow is transferred over a rough ground, which in the present exemplary embodiment is formed by the flow profile 13. By means of the flow body 9, the source of eddies arising between this and the profile base 13 is held in its position and the mixed flow entering at 1 is pressed apart in a conical manner. The "tulip-shaped" inlet cladding 10 of the mixture flow inlet 1 improves and stabilizes the flow conditions, in particular with regard to the discharge of the partial flow 6. B. the suction tube 11, which is used to suck off the respective lighter component of the mixture. The remainder of the mixture exits the separator at 12. The F i g. 2 shows the pressure profile as it develops in the separating device. According to this, the primarily excited external potential flow represents a zone of high pressure, the secondary excited rotational flow represents a zone of low pressure. As a result of the wall friction, the pressure profile drops towards the wall. The external potential flow, however, is essentially outside the boundary layer of this wall friction. As a further exemplary embodiment, FIG. 3 shows a series connection of several stages of separating devices in the form of a cascade arrangement to improve the separating effect, in particular in the case of media whose inertia differ only slightly from one another. The mixture enters the separating devices 16, 17 and 18 at 10 and possibly also at 11 and 12 via the nozzles 13, 14 and 15. The heavy component leaves the combustion devices 19, 20, 16 and 17 via the lines 19 a, 20 a, 16 a and 17 a and is fed to the flue pipes 16 b, VTb, 18 b and 21 b for further separation in the separation devices 16, 17 , 18 and 21 supplied. The lighter component flows through the discharge pipes 18 b, 17 b, 16 b, 20 b and 19 b into the following separating devices 18, 17, 16, 20 and 19 and emerges from the latter as a downstream mixture component. The remainder of the mixture exiting via lines c, 20 c, 16 c, 17 c and 18 c is conveyed back into the respective upstream separating device. In this way, a mutual separation of the mixture amount containing the lighter or the heavier component and the remainder of the mixture is achieved. Patent claims: 1. Process for separating gaseous and liquid media of different mass inertia, in particular of isotopes, by means of a rotary flow in the area close to the wall a cylindrical vortex chamber through tangential, the main flow direction of the to be separated Media obliquely oppositely directed introduction of an auxiliary medium a potential circulating flow stimulated and maintained and this at the level of an axial introduction of the media to be separated into one within the potential circulation flow circulating and to this having an opposite axial direction of progression transferred rotary flow is, characterized in that in each case the medium with lower inertia With the help of one arranged in the common axis of rotation of potential circulation and rotational flow Extraction device is sucked off and that in the transition zone between potential circulation and rotational flow merged medium of greater mass inertia with a branch of the potential circulation flow through an outlet concentrically surrounding the media inlet is discharged. 2. Device for performing the method according to claim 1, characterized in that that a drain pipe (11) is provided as a trigger device, the numerous over its entire length Has passage openings (22) for the medium of lower inertia. 3. Device for performing the method according to claims 1 and 2, characterized in that that several separation stages (16 to 20) are provided and the extraction device at its downstream end as an inlet pipe is designed for the mixture flow to be introduced into the respective downstream separation stage. 4. Device for performing the method according to claims 1 to 3, characterized in that that to withdraw the remainder of the media remaining in the rotational flow (7) a further trigger device (12, 16 c to 20 c) is provided. 5. Device for performing the method according to claims 1 to 3, characterized in that that when using several separation stages (16 to 20) starting from the bottom of each vortex chamber discharge lines (16 a to 20 a) for feeding the separated medium of greater inertia into a front of the in each case the last separation stage are provided. Considered publications:
French patent specification No. 1096 283. 1 sheet of drawings 709 618/472 7.67 © Bundesdruckerei Berlin