High speed absorbing unit

 

The invention can be used for sampling air environment: atmospheric air of residential areas, the air of working zone, etc., and the subsequent chemical or other quantitative determination of required and pollutants in a selected sample of air. High speed absorbing unit includes a cyclone-drop, britholite with the outlet pipe having two adiabatic expander, generator aerosol spray in the form of Venturi tubes with nozzle irrigation. Nozzle irrigation is installed under the second adiabatic expander cyclone drop-britholite. The device has a supply of the circulation pipe connecting the aerosol generator torch - jet irrigation bottom of the cyclone drop-britholite. Nozzle irrigation installed in the last third of the neck of the Venturi tube in the direction of the gas-liquid phase in the Venturi pipe. The Venturi pipe is made with the opening angle of the cone 10-20. Nozzle irrigation is made with an oblique cut of the working edge angle=25-70. The device provides rapid analysis of the ecological status of the air basin due to the possibility Yan a short time. 1 C.p. f-crystals, 1 Il.

The invention relates to the field of modern industrial and environmental condition monitoring and environmental monitoring. In particular, it relates to absorbent devices used for sampling of air (atmospheric air of residential areas, areas of protective measures, sanitary protection zones, the air of working zone, etc.), in order to conduct subsequent chemical or any other qualitative or quantitative detection required (for example, the amount of volatile in the recreation area), as well as pollutants in the selected sample of air, and hence in the investigated air.

The invention can be used in environmental and other purposes in various industries (chemical, medical, food, and so on). In addition, it can be widely applied in the system of the Ministry of health of the Russian Federation in the work of the sanitary-epidemiological stations (SES) and health facilities (motels, hospitals, dispensaries and so on), Ministry of natural resources of the Russian Federation, Federal service of Russia for Hydrometeorology and monitoring of the neighborhood is cnyh and practical research.

The literature describes a variety of instruments and devices adsorption type used for sampling air of industrial premises. These include adsorption devices of various authors: Petrie, Polezhaeva, Richter, Zaitseva, Gernet. Also used aspirators, palmeri, ejectors, etc. In addition, sampling of air used aerosol filters and containers with solid sorbent[1, 2, 3, 4]. These devices are used for sampling of atmospheric air of residential areas and various other air samples.

The main disadvantage of the known absorption devices is that the rate of sampling of the air in them is small. Only when sampling for aerosol filters air flow can reach 140 DM3/min. Small speed sampling of the air in the adsorption devices do not allow to rapidly accumulate in the sample is sufficient for analysis, the number of pollutant (analyte) in accordance with modern levels of maximum permissible concentrations (MPC), especially for the analysis of atmospheric air of residential areas. Today it is especially important, because for a number of industrial objects introduced.

The technical nature of the proposed instrument can be considered on the example of the absorptive device for sanitary-hygienic studies of air (known as device Gernet) [5]. The device Gernet made in the form of a vertically arranged vessel pear shaped, provided with a nozzle used for spraying passively air poured in the lower part of the vessel absorbing liquid, and having in the upper part of the pipe for connection to a pump air consumption (exhauster) [5].

The main drawbacks of the device Gernet related to the fact that, as is known, the size of the aerosol plume derived using nozzles, such applied in the device, can reach several meters [6]. However, the design of the device is such that a portion of the formed aerosol, consisting mainly of fine particles, carried away (flies away) from the device. At the same time, even a slight change in air flow rate (sampling) significantly changes the gas, hydro - and aerodynamics of the process of aerosol formation, leading to the formation of a very fine aerosol (theoretically) with increasing air speed, or dramatically enlarging the aerosol at the slightest reduction in the rate in the first flow of sampled air, thereby reducing the sorption of contaminants from the atmospheric air. By increasing the speed significantly increases the ablation of absorbing liquids in the form of drop-brythons. The increase in drop-brythonic leads to low results of the subsequent analysis. These circumstances are particularly affected in the case of sampling large volumes of air samples. In addition, the device Gernet cannot be used for rapid analytical determinations of purity of the atmospheric air of residential areas due to the fact that the rate of sampling air with it is small and is only 10-20 DM3/min [5].

The closest prototype of this invention can be considered as "Absorbing device for assessment of ecological purity of air" [7].

Specified absorptive device is fast and provides rapid analysis of the ecological status of the air basin by sampling air with a flow rate of not less than 100 DM3/min, which allows the concentration of the air sample at a million or more times in a short time.

Adsorption device is equipped with a cyclone britholite with the outlet pipe, is made with two adiabatic rasna. The generator is installed under the second adiabatic expander exhaust pipe of the cyclone of britholite and connected to the bottom of the cyclone of britholite feeding tube. The use of cyclone significantly increase the airflow in the selection of his samples. Sufficient efficiency of sorption provides the aerosol generator. Circulation of absorption liquid allows for the accumulation of pollutants in the sample [7].

Research in recent years has made it possible to identify shortcomings of the prototype, which is selected as the aerosol generator Venturi pipe having a standard angles confuser and diffuser, does not provide full disclosure of the aerosol plume, thereby reducing the efficiency of sorption of contaminants during sampling air environment. Furthermore, the design of the spray nozzles does not create optimal conditions for education "deployed" aerosol plume, which in turn reduces the surface contact of the air stream with an absorption liquid, thereby reducing the recovery ratio of pollutants (and other designated substances) from the air flow.

The technical result is the creation of a broadband absorber is Noah environment.

Technical result is achieved by the proposed high-speed absorption device. High speed absorbing device consists of a cyclone with the outlet pipe having two adiabatic gap (extender), generator aerosol spray in the form of Venturi tubes with nozzle irrigation installed under the second adiabatic expander cyclone drop-britholite, and the supply of circulating tubes connecting the aerosol generator torch (nozzle irrigation) with the bottom of the cyclone drop-britholite.

Cyclone-drop, britholite and the aerosol generator torch connected to supply a circulating tube, providing a uniform flow of an absorption liquid, due to the automatic feedback between the gas stream and the flow rate of the absorbing fluid per unit volume of sampled air.

The aerosol generator torch is installed under the second adiabatic expander cyclone drop-britholite and made in the form of normalized irrigated Venturi tubes, providing full disclosure of aerosol torch comprising a nozzle irrigation, creating optimal conditions for the formation of a "deployed" �chr/176.gif">allowed under identical external dimensions of the device to increase the volume flow of sampled air from 1.5 to 1.7 times, i.e., to take samples of air instead of consumption 100 DM3/min with a flow rate of 150 or even 170 DM3/min.

The design of the nozzle, is made with an oblique cut of the working edge angle=25-70located either up or down, or left or right, and installed in the last third of the neck of the Venturi tube in the direction of the gas-liquid phase pipe Venturi, allowed to increase the flow of irrigating the air flow of the fluid per unit volume of air is about 1.5 times that led to the formation of more dense ("compact", "deployed") of the aerosol plume. Additionally seal the aerosol plume is due to the fact that aerosol torch was rotating, i.e. the projection of the motion can be considered as a kind of hypothetical spiral, moving along the relative axis of the cone. The length of the aerosol plume has increased significantly, which has provided a proportional increase in the contact time between the air and the surface of the absorbing liquid.

In addition, the joint effect of the implemented normalization of aerosol generator and razrabotcheskogo (for some substances it reaches more than 99%). This occurs by increasing the time of contact of air with the absorption liquid in connection with the formation of a rotating spray torch. Increasing the contact time between the air - aerosol liquid surface is a major factor leading to the increase of the coefficient of sorption of pollutants into the absorption liquid.

Comparative analysis with the prototype shows that the proposed high-speed absorbing unit is characterized by the presence of the aerosol generator torch, made in the form of normalized irrigated Venturi tubes, providing full disclosure of aerosol torch comprising a nozzle irrigation new design that creates optimal conditions for the formation of a "deployed" spray torch.

Thus, the claimed high adsorption device meets the criteria of the invention of "Novelty."

The comparison of the proposed solutions not only prototype, but also with other technical solutions used in the art, failed to reveal any sign that is applied in the inventive high-speed absorbing unit.

The drawing shows a diagram of the high speed absorption of the device.

High speed recording motion is savannas irrigated Venturi tubes, includes: confuser (K), neck (G), the diffuser (D), and a nozzle irrigation (f);

- lead pipe (2) having two adiabatic expander (3,4);

- cyclone-drop, britholite (5);

bevel the bottom of the cyclone drop-britholite with a break of the absorption liquid (6);

- supply of the circulation tube (7).

High adsorption device operates as follows. Before working in high-speed absorbing unit is filled with absorbing liquid (In). Most often as an absorbing liquid use deionized or distilled water. High-absorbing device is connected to the booster air flow (not shown). Included booster air flow, providing proses required amount of air. The air flow passes through the aerosol generator torch (1), made in the form of normalized irrigated Venturi tubes including: confuser (K), neck (G), the diffuser (D), and a nozzle irrigation (f). It creates a vacuum, through which the supply of the circulation pipe (7) is fond of absorbing liquid (b) which is in the neck and the cone normalized irrigated Venturi tubes crushed air poornam the torch passes the first stage of sorption (absorption) of pollutants from atmospheric (selected) air. Spray torch (A) absorbing fluid (In) facing the inner surface of the housing of the cyclone drop-britholite (5) and the outer surface of the exit pipe (2) and is broken about them, forming a two layer film of the absorbing liquid (B). These two film layers are the second stage of absorption of pollutants from the atmosphere (selected) air. Analyzed the air makes several turns inside the cyclone drop-britholite (5) and changes its direction by 180against the surface of the absorbing liquid (C) rotating the conical bottom of the cyclone drop-britholite (5). This is the third step - inertial deposition (absorption) of the contaminants selected from the atmospheric air.

The sample absorbing fluid (In) with absorbed in her impurity contaminants collected in the conical bottom of the cyclone drop-britholite (5). It is intended for later analysis in the laboratory.

Not containing impurities of pollutants in the air with the spray is directed to the lower end of the outlet pipe (2) cyclone drop-britholite (5). The main part of the spray is deposited on the walls of the cyclone drop-britholite (5), not reaching the end of the e (2) provides for two adiabatic expander (3, 4).

After passing through the high-speed absorbing unit is suitable for analysis of the quantity of atmospheric air off the pump flow. The absorbing liquid is analyzed.

Sources of information

1. Peregud E. A. Sanitary-chemical control of the air environment. The Handbook. L.: Chemistry, 1978.

2. Muravyova S. I. and other guidance on the control of harmful substances in the air of working zone. M.: Chemistry, 1991.

3. Bukovsky, M. I. guidance on the control of harmful substances in the air of working zone. Ref. ed. Book 2. M.: Chemistry, 1993.

4. Muravyova S. I. and other Reference control of harmful substances in the air. M.: Chemistry, 1988.

5. Gernet E. C. Copyright certificate № 81660, CL G 01 N 31/06, 1956.

6. Green X., lane C. Aerosols - dust, fumes and mists. L., Chemistry, 1972.

7. Outside the Belarus centuries, Vasiliev B. N. the Patent of Russian Federation № 2102720 from January 20, 1998 On the application number 96110611, the priority of the invention may 28, 1996 (class G 01 N 1/22).

Claims

1. High adsorption unit containing the cyclone drop, britholite with the outlet pipe having two adiabatic expander, generator aerosol spray in the form of Venturi tubes with nozzle irrigation installed under the second generator aerosol torch - the nozzle irrigation bottom of the cyclone drop-britholite, characterized in that the nozzle irrigation installed in the last third of the neck of the Venturi tube in the direction of the gas-liquid phase pipe Venturi and the Venturi pipe is made with the opening angle of the cone 10-20and nozzle irrigation is made with an oblique cut of the working edge angle=25-70.

2. The device under item 1, characterized in that the direction of the oblique cutoff nozzle is either up or down, or left or right.

 

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