SU1153963A1 - Diluter of concentrated aerosol - Google Patents

Abstract

THINNER OF THE AIROSE'S CONCENTRATION, comprising a housing with a lid equipped with a filter installed at the inlet orifice (L SP 00 Oi 00 with an outlet branch pipe, characterized in that, in order to improve the quality of mixing and increase the accuracy of determining the parameters of the aerosol, in the wall the cases are made diametrically opposite holes, which are equipped with additional filters, and all inlets are provided with diaphragms placed along the downstream of the filters, while the holes in the diaphragm on the cover are placed along the circumference, and the holes in the diaphragms on the side walls - along the chords.

Description

1 The invention relates to dispersion and can be used to determine the parameters of concentrated aerosol in scientific research, medicine, technology, in particular, to monitor the effectiveness of gas purification systems from suspended particles. The purpose of the invention is to improve the quality of mixing and increase the accuracy of determining the parameters of the aerosol. FIG. 1 shows a schematic of the diluent; Fig 2 view A in Fig „1; in fig. 3 is a view B in FIG. 1; in fig. 4 is a histogram of the pulse analyzer; in FIG. 5 time dependence of the diluted aerosol concentration. The co-centered aerosol diluent includes a housing 1 with a lid 2 fitted with filter 3 installed at the inlet 4, and a conical bottom 5 with the outlet 6. Diametrically opposite holes 7 and 8 are made in the wall of the housing 1, which are equipped with additional filters 9 and 10 . The diaphragm 11 is installed in the inlet 4, the diaphragm 12 is installed in the opening 7, and the diaphragm 13 is in the opening 8. Filters contain a barrier partition 14 placed on the supporting grid 15, creating an air gap along with the separating ring 16 in front of diaphragms to reduce flow resistance. Holes 17 are made in the idler 11 (phi 2). In order to obtain a smooth seizing jet flow, the orifices 17 are circumferentially aligned with the OUTPUT 6, the discharge of the openings 18 in the diaphragms 12 and 13 are shown in FIG. 3, for

parallel to the cap of the jet streams, the orifices are located along the chords parallel to the cap, and the diaphragms are installed with a turn of 180 ° one relative to the other. An inlet 19 is opened in the roof of the housing 50, which opens at the time of entry of the aerosol sample.

The device works as follows, .55

Into the diluent, filled with particulate air, is introduced through inlet 19 by means of

A set with a pulse converter and an AI-128 analyzer is used to measure the parameters of sodium-burning aerosol products.

The diluent has the following parameters: the internal volume is 0.7 l, the diameter of the holes in the diaphragms is 3 mm, the number of holes in the diaphragm is 4, 4 jet speed of 20 cm / s, and as 3 d; a sampling probe, an aerosol sample of volume V, then the outlet 6 is connected by a tube to the counter of the counter, creating a slight discharge in the diluent, under the action of which the air passing through the filter partitions 14 is cleared of particles, fills the gap in front of the diaphragms 11-13 and through the holes 17 and 18 in the form of jet streams enters the diluent cavity. The flat, offset-in-height, parallel caps of the airflow from the diaphragms 12 and 13 mix and hold the aerosol sample in circulation between the diaphragms 12 and 13, and the cylindrical jet flow created by the diaphragm II passes through the circulating diluted aerosol to capture the particle and through the pipe 6 takes out from the diluent. For 2/3 of the time of measuring one sample, the concentration of the recorded particles is kept close to the level established at the beginning of the measurement, then quickly decreases, and when it reaches a conditionally zero level, the measurement stops. After that the diluent is ready for the introduction of a trace of Aerosol sample into it. . The concentration C of the aerosol introduced in the sample is determined from the ratio C, where N is the total number of particles registered in the sample, V is the volume of the introduced aerosol sample. The particle size distribution is found according to the histogram obtained in the pulse analyzer, working in a set with a photoelectric gauge, a counter. Example. With the help of a diluent of the proposed design, a photoelectric AZ-4 counter, allonges were used in the filter holders,

A 0.5 ml aerosol sample was introduced into the diluent immediately after sampling with the help of a medical syringe. The measurement takes 210 seconds. In this case, a histogram was obtained in the pulse analyzer (Fig. 4) and 4,70468 particles were recorded. The time dependence of the concentration of the diluted aerosol is shown in full line (Fig. 5), the dotted line shows the similar dependence obtained with stirring by shaking and turning. The change is stopped at a residual concentration in the diluent, and therefore the total amount of particles remaining in the diluent is

g- 7-10. The concentration of particles in the injected aerosol sample is according to the above ratio of 0.94 - 10, taking into account the particles remaining in the diluent.

P

255075

-0.955-10 cm - Splitting coefficient in this experiment 10.

Thus, pre pagasma diluent design has a higher dilution factor of 10 (in a known diluent 5-10) due to leakage through the dilution air device

and high stability of the concentration of the diluted aerosol (concentration fluctuations do not exceed 10%, and in a known diluent reach 100%) due to retention with

circulating the injected aerosol sample, its jet movement and jet removal of particles from it for registration.

All this makes it possible to measure the parameters of an aerosol with a concentration of more than 10 cm, moreover, with a higher accuracy due to the exclusion of temporal variations in the concentration of recording equipment.

In id 6

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HoffOMi amal1 / ag / 77ora Figure 4

Claims (1)

CONCENTRATED AEROSOL THINNER, comprising a housing with a lid equipped with a filter installed on the inlet and days with air outlet, with the aim that, in order to improve the quality of mixing and improve the determination of parameters in the wall of the housing aerosol control, there are diametrically opposite openings that are equipped with additional filters, and all inlet openings are equipped with diaphragms located along the flows after the filters, while the openings in the diaphragm on the lid escheny in a circle, and the hole in the diaphragm on the side walls - along the chords. To the eye of the metering sampler, an aerosol sample of volume V, then the outlet pipe 6 is connected by a tube to the counter intake, which creates a small vacuum in the diluent, under the influence of which the air passing through the filtering partitions 14 is cleaned of particles, fills the gap in front of the diaphragms 11-13 and through the openings 17 and 18 in the form of jet streams enters the cavity of the diluent. The flat jet displaced in height parallel to the cover air flows from the diaphragms 12 and 13 mix and circulate the introduced aerosol sample in the space between the diaphragms 12 and 13, and the cylindrical jet stream created by the diaphragm 11. passes through the circulating diluted aerosol, captures particles in it and through the pipe 6 carries out of the diluent. During 2/3 of the measurement time for one sample, the concentration of the recorded particles is kept near the level established at the beginning of the measurement, then decreases rapidly, and when it reaches a conditionally zero level, the measurement stops, after which the diluent is ready for the introduction of the next aerosol sample. The concentration C of the aerosol introduced in the sample is determined from the ratio C th, where M is the total number of particles recorded in the sample, V is the volume of the introduced aerosol sample. The particle size distribution is found by the histogram in the analyzer with