RU2793896C1 - Device for dispersing liquid materials - Google Patents

Abstract

FIELD: chemical industry.

SUBSTANCE: design of devices for dispersing liquid materials in chemically aggressive gelling media. The device is intended for use in the chemical industry for the production of granular materials. The device consists of a container with a spray liquid, a system for supplying a gas injection mixture and a dispersant. The gas injection medium supply system is made in the form of an internal circuit with an air supply pipe, an external circuit with an air-ammonia mixture supply pipe, as a dispersant, the device consists of a capillary along which a continuous air flow moves along the contour through a nozzle to detach a drop of the dispersed liquid when it reaches its size critical for a given air supply rate, while the external circuit consists of three lines: for separate supply of a compressed air flow to the mentioned circuit, for supplying a mixture of gases: ammonia vapor and air into the circuit at a pressure not exceeding the pressure in the circuit, for supplying local flow of compressed air to the exit from the capillary, providing the required size of the dispersible droplets.

EFFECT: improvement for the reduction of the gelling medium effect directly on the capillary, as well as ensuring the hydrolysis of dispersed drops before entering the gelling solution, thereby reducing the risk of deformation of granules when they enter the gelling medium.

1 cl, 1 dwg, 1 tbl, 1 ex

Description

The invention relates to the design of devices for dispersing liquid materials in chemically aggressive gelling media. The claimed device is intended for use in the chemical industry for the production of granular materials.

From the prior art there is a method for dispersing a liquid and an adjustable aerosol dispersant for its implementation (RF patent No. 2449842, IPC V05V 17/00, publ. 21.07.2010). The liquid dispersion method includes liquid supply from the pump and air from the supercharger and acceleration of the latter in the nozzle. Then, liquid is preliminary hydraulically crushed into drops in the spray cone of the nozzle and further pneumatic dispersion of liquid droplets in the field of ultrasonic air vibrations in a supersonic jet from the auxiliary nozzle circuit into aerosol. Next, the aerosol is supplied for final pneumatic dispersion into the supersonic air jet from the main contour of the nozzle transporting the aerosol to the place of consumption.

From the patent of the Russian Federation No. 2251471, IPC B22F 9/08, publ. 05/10/2005, a dispersant device is known, made in the form of slot nozzles, internal - for air supply, external - for water supply, providing the exit of particles with a given size.

However, in the known device, no means are provided to prevent clogging of the dispersant capillary with particles from the external environment.

A dispersant is known (RF patent No. 2151635, IPC B01F 7/00, publ. 06/27/2000), containing pipes for supplying liquid and gas and a multi-channel gas distributor with a dispersant made in the form of two composite elements with calibrated holes, providing creation of a finely dispersed medium.

However, in the known device, there are also no means for preventing clogging of the dispersant capillary with particles of the working medium.

The urgency of the technical problem being solved is based on the following. In the production of a granular sorbent, in particular an inorganic sorbent based on titanium and zirconium oxides, the problem arose of dispersing the working solution into a gelling medium. When using the classical design of the gas-liquid nozzle, gelation of the solution occurred at the exit from the capillary, since the nozzle is located directly above the ammonia vapor, which contributed to the clogging of the outlet of the dispersant capillary.

The task of the authors of the invention is to improve the design of the gas-liquid nozzle to prevent clogging of the capillary outlet, maintain the shape and strength of the granules.

The technical result provided by the use of the claimed device is to improve the design in the direction of reducing the effect of the gelling medium directly on the capillary, as well as to ensure the hydrolysis of dispersed drops before entering the gelling solution, thereby reducing the risk of deformation of the granules when they enter the gelling medium. .

The specified task and technical result are provided by those. that, unlike the known (prototype) device for dispersing liquid materials in chemically aggressive gelling media, containing a container with a spray liquid, a gas pressure supply system and a dispersant, according to the invention, the gas pressure medium supply system is made in the form of an internal circuit with an air supply pipe , an external circuit with a branch pipe for supplying an air-ammonia mixture, as a dispersant, the device contains a capillary, along which a continuous air flow moves along the contour through the branch pipe to separate a drop of the dispersed liquid when it reaches critical sizes for a given air supply rate, while the external circuit consists of three lines: for separate supply of a compressed air flow to the said circuit, for supplying a mixture of gases of ammonia vapor and air into the circuit at a pressure not exceeding the pressure in the circuit, for supplying a local compressed air flow to the exit from the capillary, providing the required size of dispersed drops.

The inventive device for dispersing liquid materials is explained as follows.

In FIG. 1 schematically shows an option for implementing the proposed device, where: 1 - a container with a working solution; 2 - circuit with compressed air, where the drop occurs from the capillary (5); 3 - circuit with compressed air, isolating the capillary from the circuit (4) and the external environment; 4 - circuit with air-ammonia mixture; 5 - capillary; 6 - branch pipe for introducing compressed air into the circuit (2); 7 - branch pipe with compressed air directed to the circuit (3); 8 - branch pipe with compressed air and ammonia vapor to the circuit (4).

The present invention is an air-liquid disperser device for dispersing liquid materials in chemically aggressive gelling media, containing a container with a sprayed liquid, a gas injection medium supply system and a disperser. The gas injection medium supply system is made in the form of an internal circuit (3) with an air supply pipe (7), an external circuit (4) with an air-ammonia mixture supply pipe (8), the device contains a capillary (5) as a dispersant, along which it moves a continuous air flow along the contour (2) through the pipe (6) to separate the drop of the dispersed liquid when it reaches the critical size for the given air supply rate. According to the proposed device, an air circuit (3) is used to isolate the dispersible solution from the external gelling medium. which isolates the air-liquid flow to avoid gelation of the solution at the end of the capillary until it is detached. To ensure the hydrolysis of dispersed granules before entering the gelling medium, an external circuit (4) with an air-ammonia mixture is used to prevent deformation and maintain the mechanical strength of the granules.

The air pressure in the circuit (2) is regulated in such a way as to ensure the separation of the solution drop at the exit from the capillary (5). Changing the pressure parameters in the circuit (2) provides a change in the size of the droplets due to its disruption when it reaches a size that is critical for a given air velocity. The circuit (3) is designed to isolate the capillary and the air flow from the circuit (1) from the external environment, which prevents them from mixing and getting into the dispersible solution. The circuit (4) is intended for the deposition of the formed droplets before entering the gelling medium. This makes it possible to ensure the spherical shape and mechanical strength of the granules, bypassing the deformation of the drop upon impact with the gelling solution. The body of the device has the following nozzles: 6 and 7 - for the input of compressed air; 8 - to enter a mixture of compressed air gases and ammonia vapor.

The claimed device works as follows.

Initially, compressed air is supplied through the branch pipe (7) to the circuit (3) in such a way as to ensure the screening of the capillary from the external environment and the air-ammonia mixture from the circuit (4). A mixture of gases, ammonia vapors and air is supplied through the pipe (8) to the circuit (4) for carrying out the process of hydrolysis of the dispersed liquid before it enters the gelling solution, which ensures the preservation of the shape and strength of the gelled granules. The container (1) is filled with the working solution, then the solution is fed by gravity through the capillary (5) for further dispersion. Compressed air is supplied through the branch pipe (6) to the circuit (1) in such a way that the drop that breaks off the capillary under the action of the critical mass has the required size at a given air flow. After the dispersion process, the capillary is washed by filling the container (1) with distilled water to prevent the working solution from drying out and, as a result, clogging of the capillary.

Thus, when using the proposed device for dispersing a solution into a gelling medium, a new technical result is achieved, which consists in increasing the efficiency of an air-liquid dispersant designed to operate in chemically aggressive gelling media.

The possibility of applying the invention can be illustrated by the following example.

Example 1. In laboratory conditions, the proposed device for dispersing liquid materials was tested on a prototype shown in FIG. 1, a dispersed liquid based on hexachlorotitanic acid and polyvinyl alcohol was used as a liquid material.

Compressed air is supplied through the branch pipe (7) to the circuit (3) in such a way as to ensure that the capillary is shielded from the external environment. Through the branch pipe (8) a mixture of gases is supplied: ammonia vapor and air, into the circuit (4) at a pressure not exceeding the pressure in the circuit (3). From the container (1) through the capillary (5) the dispersion solution is fed by gravity. Compressed air is supplied through the nozzle (6) in such a way that the drop coming off the capillary (5) (D) has the required size. After the end of the dispersion process, the capillary is washed by filling the container (1) with distilled water, which excludes contamination of the capillary in the subsequent dispersion cycle.

As a result of the operation of the proposed device, dispersion of the liquid medium was ensured with the release of dispersed particles (droplets) with the required size in the range from 100-1000 microns. Table 1 shows the statistical distribution of particle sizes obtained in the dispersion process using the proposed device under the conditions of the example.

Thus, the use of the proposed method makes it possible to achieve the claimed technical result, which consists in increasing the efficiency of an air-liquid dispersant designed to operate in chemically aggressive gelling media.

Claims (1)

A device for dispersing liquid materials in chemically aggressive gelling media, containing a container with a sprayed liquid, a gas pressure mixture supply system and a capillary, characterized in that the gas pressure medium supply system is made in the form of three independent lines: the first one is for separate supply of compressed air flow to the aforementioned circuit, the second - for supplying a mixture of gases of ammonia vapor and air into this circuit at a pressure not exceeding the pressure in the circuit, the third, closest to the capillary, - for supplying a local compressed air flow to the exit from the capillary, to ensure separation of dispersible drops of the required size .

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