SU1763010A1 - Method for preparation of dry aerosol and equipment for its realization - Google Patents

Abstract

Use: in the field of spraying materials to obtain aerosols. Summary of the invention: no less than 9 spray nozzles with a diameter of 0.5 ± 0.05 mm are mounted in a jet mill, and the axial lines of two adjacent nozzles intersect at an angle of 30-40 °, and the process itself is carried out at an accelerating air pressure and spray 2.3-2.6 atm and air flow 95-100 l / min. In addition, a cone crusher is used as a generator powering device, and the jet mill is equipped with a cone separator with tangentially arranged openings for the withdrawal of an aerosol stream. 2 sec. f-ly, 2 silt, 2 tab.

Description

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The invention relates to the field of spraying materials, and specifically to methods and devices for producing aerosols.

The purpose of the invention is to develop a method and apparatus for obtaining a dry aerosol, which allow to increase its quality by increasing the dispersion and concentration of the solid phase.

This goal is achieved by the fact that in a device comprising a jet mill, having a body, a metering unit, accelerating and spraying nozzles, supply lines of the sputtered material and compressed air into the grinding chamber, the jet mill is equipped with at least 9 spray nozzles with a diameter of 0.5 ± 0.05 mm, arranged so that the axial lines of each pair of adjacent nozzles intersect. At an angle of 30-40 °, a cone mill is built into the body as a metering unit, and a conical separator with a tang is installed at the outlet of the grinding mill of the jet mill. There are potential openings for the discharge of an aerosol stream, while the spraying itself is carried out at air pressure at all nozzles of 2.3-2.6 atm and its flow rate is 95-100 l / min.

FIG. 1 and 2 depict the proposed device.

It consists of a feeder 1, a cone mill with a hopper, a jet mill with a compressed air line 2 connected to it, and two cyclones 3 in series connected at the jet mill outlet (see Fig. 1).

The jet mill has a housing 4, a compressed air chamber 5, a booster tube 6, a booster nozzle 7 with a diameter of 0.8 ± 0.1 mm and at least 9 spray nozzles 8 with a diameter of 0.5 ± 0.05 mm located along the periphery of a flat horizontal grinding

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camera 9 at an angle of 35 ± 2 ° to the radius of the camera (see Fig. 2). The angle of intersection of the axial lines of two adjacent nozzles is shown in Table. 2 (example 2). The accelerating tube 6 connects the feeder 1 to the grinding chamber 9. The compressed air line 2 is connected to the compressed air chamber 5 and to the accelerating tube 6. In the center of the grinding chamber 9 there is a conical separator 10 with tangential holes 11, the outlet of which is connected to cyclones 3.

The material intended for aerosolization is loaded into the hopper of the feeding device 1. From the feeding device, the pre-crushed material, the median of the weight distribution of which is 50-80 µm, enters the accelerating tube 6, where it is accelerated by air flow from the accelerating nozzle 7 and injected to the grinding chamber of the 9th jet mill. Compressed air is supplied to the compressed air chamber 5 and the spray nozzles 8 connected to it. In the grinding chamber 9, the material is finely crushed and sprayed in intersecting jets of compressed air. With the passage of the resulting dust-gas mixture through the tangential holes 11 of the conical separator 10, large particles are separated and returned to regrinding. The additional separation of the coarse fraction of particles is carried out in cyclones 3, after which the resulting aerosol stream is fed to the aerosol chamber.

The advantages of the proposed method and device are illustrated by the following examples:

Example 1. Sodium chloride was transferred to the aerosol state using the device proposed, which included a jet mill with an accelerating nozzle with a diameter of 0.8 ± 0.1 mm and 12 spray nozzles with a diameter of 0.5 ± 0.05 mm The dispersion of the aerosol, obtained in different modes, is given in table. one.

Example 2. The sodium chloride was aerosolized using the device of the invention, the jet mill having different numbers of spray nozzles with a diameter of 0.5 ± 0.05 mm. Characteristics of the resulting aerosol are given in table. 2

From tab. 1 and 2, it follows that the most highly dispersed aerosol (median weight distribution 3-3.5 µm), which is simultaneously characterized by a high concentration of 970-1500 mg / m, can be obtained using an aerosol generator, the jet mill of which is equipped with at least 9 spray nozzles, the axial lines of adjacent nozzles intersect at an angle of 30-40 °, in the mode when the air pressure at the nozzles is 2.3-2.6 atm at a flow rate of 95-100 l / min.

Claims (2)

1. A method of obtaining a dry aerosol by metering the material into the air flow of a jet mill, accelerating it through nozzles and spraying, characterized in that, in order to improve the quality of the aerosol, acceleration is carried out at an air pressure on all nozzles of 2.3-2 6 atm and its consumption is 95-100 l / min. 2. A device for producing a dry aerosol, including a jet mill with a grinding chamber, a metering unit, accelerating and spraying nozzles, supply lines for the sprayed material and compressed air into the grinding chamber, characterized in that, in order to improve the quality of the aerosol, the jet mill is equipped less than 9 spray nozzles with a diameter of 0.5 ± 0.05 mm, the axial lines of each pair of adjacent nozzles intersecting at an angle of 30-40 °, the dispenser is designed as a cone crusher, and a conical separator with tangent is mounted in the grinding chamber flaxen spaced apertures for withdrawing the aerosol stream. Table 1 table 2 7 V7 :about CD-, Fve. 2