SU857777A1 - Device for sampling aerosols - Google Patents

Description

(54) APPROACH FOR SELECTING SAMPLES OF AYUSOLEAS

one

The invention relates to devices for sampling aerosols, mainly high adhesion materials, from gas streams, working premises, in determining the efficiency of gas cleaning apparatuses of the chemical, metallurgical and other branches of the national economy.

A device comprising a housing with a branch tube, a replaceable tip and a filter 1 is known.

The disadvantage of the device is the difficulty of preparing it for operation, the narrow range of permissible dust content of the gas to be extracted, and rapid filter plugging.

A device for sampling aerosols is known, comprising a flow tube separator with a gas inlet tip and a swirler with channels, an inlet and an outlet sleeve, with which the filter 2 is located.

The drawbacks of the device are the low efficiency of aerosol trapping of highly adhesive materials, the complexity of the design.

The purpose of the invention is to increase the efficiency of aerosol trapping of highly adhesive materials and simplify the design.

This goal is achieved by the fact that in a device for sampling aerosols, including a centrifugal separator with a gas inlet tip and a swirler with channels, an input and output sleeves, between which a filter is located, the centrifugal separator is made in the form of a diffuser and connected to the output sleeve, the input sleeve is filled with side holes, the swirler is cylindrical-conical in shape, with the channels of the swirler located at an angle less than 90 ° to the axis of the device.

In this case, the input sleeve is made in the form of one or several diffuser inserts.

In addition, the gas intake tip, swirler and diffuser inserts are made of hydrophobic materials.

FIG. 1 shows a device with a section view; in fig. 2 - swirler, drove; FIG. 3 shows a section A-A in FIG. 2. The aerosol sampling device consists of a gas intake tip 1, a separator 2, a swirler 3, a protective diffuser insert 4, a filter 5, a sealing strip 6, an outlet 7 with a pneumatic conveying channel. The housing of the separator 2, the swirler 3, the protective diffuser insert 4 form a cavity for collecting the vaporized fraction of the aerosol coarse particles. The device works as follows. The gas flow through the inlet of the tip 1 enters the cylindrical cavity of the swirler 3. In the channels 8 of the swirler, the rotation of the gas flow is induced. Under the action of centrifugal force, aerosol particles are separated from the rotating gas flow, deposited on the inner walls of the separator 2 and the outer surface of the protective diffuser insert 4. When sampling aerosols from highly dusty streams, an additional degree of swirl or diffuser insert is installed. The separated part of the aerosol particles accumulates in the lower parts of the cavities. Separated from a significant proportion of aerosol particles, the gas flow through the side openings of the protective diffuser insert 4 is fed to the aerosol filter; 5, where the final gas purification from the remaining highly dispersed aerosol particles takes place. The filtered gas through the outlet tube through the pneumatic conveying channel enters the flow registration. When sampling aerosols from sparse streams, the swirler and protective diffuser insert are not installed. When sampling aerosols from streams with a particle content of 20-100 MG / N, a protective diffuser insert is installed. During the selection of prf aerosols, highly adhesion materials are installed from a highly dust-laden flow and aerosols of materials with a single swirl or multi-stage and diffuser insert. Depending on the content of particles in the stream and the material of the aerosol particles, the swirler is installed with several tangential channels; douhlepestkovye swirl with different angle of inclination of the petals. The use of the proposed device makes it possible to efficiently sample aerosols of highly adherent materials in a wide range of dust content of waste gases, for example, vent emissions of spray booths in the production of spray coatings of paint and varnish aerosols. The introduction of the proposed device will allow in comparison with the known: 1. To ensure efficient, reliable collection of aerosols of highly adhesive materials from gas streams and working premises (air conditioning, painting chambers) in a wide range of dust content of gases. 2. Improve service conditions by creating a stable mode of movement of the suction gas through the sampler, reducing Isla components, reducing threaded connections. 3. To improve the accuracy of sampling due to the loss of material trapped on the filter when removing the filter (the separator and the filter installed in the undercut of the separator are fused together). 4. A device without a diffuser insert can be used to remove contaminated air from the premises and the atmosphere. 5. The introduction of an aerosol sampling device has been tested on paints and varnishes (LKM) and allows filtering aerosol particles in the concentration range of 0.5-10-120 mg with an efficiency of 99.9%. During the sampling time, the hydraulic resistance of the sampler was 20 minutes higher with a particle content in the drawn air of 120 mg / m, as a result of which an adjustment of the air flow was not required. 1. A device for sampling aerosols, including a centrifugal separator with a gas inlet tip and a swirler with channels, inlet and outlet sleeves, between which a filter is located, characterized in that, in order to increase the efficiency of aerosol trapping and high adhesive Materials and simplify the design the centrifugal separator is made in the form of a diffuser and is connected to the outlet of the sleeve, the input is: the sleeve is made with side holes, the swirl is cylindrical-conical, and the channel the swirler is located at an angle less than 90 ° to the axis of the device. 2. The device according to claim 1, of which it is made so that the input sleeve is made in the form of one or several diffuser inserts. 3. The device according to claim 1, of which it is so that the gas-inlet tip, swirl and diffuser inserts are made of hydrophobic materials. Sources of information taken into account during ecotertizing 1.Pirumov A.I. Air dedusting. M., 1974, p. 51. 2. USSR author's certificate No. 628426, cl. G 01 N 1/24, 1975.

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Claims (2)

Claim 1. A device for sampling aerosols, including a centrifugal separator with a gas intake tip and swirl with channels, inlet and outlet sleeves, between 35 with which there is a filter, characterized in that, in order to increase the efficiency of trapping aerosols and highly adhesive materials and simplify the design, the centrifugal separator is made in the form of ₄₀ diffusers and connected to the output sleeve, inlet: the sleeve is made with side holes, the swirl is made of a cylindrical-conical shape while the channels of the swirl are located at an angle less than 90 ° to the axis 45 of the device. 2. The device according to π. 1, with the fact that the input sleeve is made in the form of one or more diffuser inserts. ₅₀ 3. The device according to π. 1, due to the fact that the gas intake tip, swirl and diffuser inserts are made of hydrophobic materials.