RU2414283C2 - Whirl flow mixer - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to mixers and is intended for preparation of emulsions, suspensions and homogeneous systems (solutions), as well as for intensification of chemical, thermal and diffusion processes that occur at interfaces "gas-fluid", "fluid-fluid". Mixer comprises two coaxial cylindrical tubes, inner being shorter than the outer, single-flight swirling devices fitted in inner tube and tubular annulus, as well as unions to feed components and discharge the mix. Components feed branch pipes arranged on inner tube end face and components discharge branch pipe are arranged on one side of the device, while, on the opposite side, mixer outer tube end face is tightly closed. Swirling device in inner tube and tubular annulus may feature different directions of swirling.

EFFECT: simplified design, higher efficiency of mixing.

2 cl, 1 dwg

Description

The invention relates to mixers and is intended for the preparation of emulsions, suspensions and the preparation of homogeneous systems (solutions), as well as for the intensification of chemical, thermal and diffusion processes occurring at the gas-liquid, liquid-liquid interface.

A known mixer of liquids and gases containing a toroidal mixing chamber, inlet and outlet nozzles connected to the mixing chamber tangentially, according to the invention, the products are fed through the inlet pipes in one direction relative to clockwise rotation, and the mixture is discharged through the outlet pipe in the opposite direction relative to clockwise rotation. (Patent for invention No. 2333789, B01F 3/04. Application. August 11, 2006, published on August 20, 2008, Bull. No. 26).

The disadvantage of this device is that with a tangential approach to the intensity of the swirling flows and, accordingly, the quality of mixing is significantly affected by the input speed of the components. Also disadvantages include the large overall dimensions of the device, because the mixing process does not use the space limited by the inner wall of the toroidal body, and low mixing efficiency in a single-pass process.

Also known is a liquid mixer comprising a cylindrical body located at opposite ends of the body of the nozzle for supplying mixed liquids, characterized in that two swirls are installed inside the body against its axis with a gap, made in the form of radial blades mounted at an angle to the axis of the body and providing opposite rotation of the mixed liquids, and the cylindrical body in the central part of the gap is perforated and a pipe having a diameter greater than ametra perforated housing portion, with a nozzle fluid mixture output. (Application for invention No. 2007121399, B01F 5/00. Application. June 7, 2007, published on December 20, 2008, Bull. No. 35).

The disadvantages of the design of this device include the low efficiency of the process, since mixing is performed only in the gap between two swirlers made in the form of radial blades mounted at an angle to the axis of the housing.

A liquid mixer comprising a housing with loading and unloading nozzles, a mixing element made in the form of a multi-auger screw with two rows of plates, the inner of which is fixed to the shaft of the mixing element, characterized in that the outer row of plates is attached to the inner row of plates or to the inner surface the case, depending on the components to be mixed, while the inner row of plates has a right approach and the external one has a left approach. (Patent for invention No. 2150993, B01F 7/24 Application. 02.06.1999, publ. 20.06.2000).

The disadvantage of this mixer for liquids is the design complexity and the need to supply external energy. Also, the use of multi-auger screws in the device limits the mixing of components received in different channels of the mixing device.

The closest technical solution to the proposed invention (prototype) is a vortex apparatus containing a chamber in which screw mixing devices with parallel screw channels and nozzles for introducing reagents and outputting reaction products are coaxially located, according to the invention the width of the peripheral screw channels is 1.4 ÷ 1.6 the width of the internal channels (SU No. 1292822, B01J 9/20. Application. 30.10.85, publ. 28.02.87, Bull. No. 8).

The main drawback of the design is the low efficiency of mixing the components, since the process proceeds only in the reaction chamber located after the twisting devices.

The objective of the invention is to simplify the design of the device and increase the efficiency of mixing components.

This problem is solved due to the fact that the direct-flow vortex mixer containing two coaxially arranged cylindrical pipes, the inner of which is shorter than the external, single-thread twisting devices installed in the inner pipe and annular space, as well as fittings for introducing components and outputting the mixture, according to the invention, input the pipes of the mixed components located on the end part of the inner pipe, and the pipe for removing the mixture from the annulus are located on one side of the device, the other side end portion of the outer tube of the mixer is hermetically sealed.

Also, single-start twisting devices in the inner tube and in the annulus can have different twist directions.

The drawing shows a General view of a direct-flow swirl mixer.

The direct-flow vortex mixer contains two coaxially arranged cylindrical pipes, the inner 1 of which is shorter than the outer 2, one-way swirling devices installed in the inner pipe 3 and the annulus 4, also fittings for introducing components 5 and outputting mixture 6, according to the invention, inlet pipes of mixed components 5 located on the end part of the inner pipe, and the pipe for withdrawing the mixture from the annular space 6 are located on one side of the device, and on the other side the end part of the outer s mixer pipe is sealed.

Also, one-way twisting devices in the inner tube 3 and in the annulus 4 can have different twist directions.

In-line swirl mixer works as follows.

Mixed components enter the inner pipe 1 of a direct-flow vortex mixer through nozzles 5, in which a swirling device 3 is located, which imparts a vortex flow to the flow. An increase in the mixing efficiency during swirling motion is provided by an increase in the intensity of both micro- and macro-mixing of the components. An increase in the efficiency of macromixing occurs when large-scale vortex formations appear in the transverse direction relative to the flow, and the growth of micromixing is caused by an increase in velocity due to the appearance of a tangential component, which generally leads to an increase in turbulization of the flow. Next, the mixture, through the end part, leaves the inner pipe 1 and enters the annular space, in the volume of which a twisting device 4 is contained. The passage of the annular flow by a stream takes place under conditions of swirling motion. The use of swirling devices with a different direction of rotation in the mixer will intensify the mixing process due to additional flow turbulization. After that, the mixture is discharged through the pipe 6 located on the outer pipe 2.

The main advantages of a direct-flow swirl mixer are:

- simplicity of design;

- high mixing efficiency due to the two-stage process;

- the process proceeds due to the flow energy, i.e. there is no need to supply external additional energy.

Thus, the use of this design of a direct-flow vortex mixer in the chemical and oil refining industries is promising.

Claims (2)

1. A direct-flow vortex mixer containing two coaxially arranged cylindrical pipes, the inner of which is shorter than the external, one-way twisting devices installed in the inner pipe and the annulus, as well as fittings for introducing components and outputting the mixture, characterized in that the inlet pipes of the mixed components are located on the end of the inner pipe, and the pipe for withdrawing the mixture from the annular space are located on one side of the device, and on the other side the end part of the outer mixer tap hermetically sealed. 2. In-line swirl mixer according to claim 1, characterized in that the single-entry twisting devices in the inner pipe and in the annulus have different twisting directions.

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