RU200991U1 - AIR SAMPLING DEVICE - Google Patents

Abstract

The utility model relates to air sampling devices, namely, devices for sampling polyaromatic hydrocarbons (PAHs) and suspended solids in industrial emissions. The device for air sampling contains a split body (1) with filter and sorption elements placed in it, the lower part of the split body (1) is connected to the inlet pipe and is made in the form of a truncated cone expanding towards the central part of the split body (1), made in the form of a cylinder, the sorption element is made in the form of a sorption cassette (2) located between the central and upper parts of the split body (1), the upper part of the split body (1) is made in the form of a truncated cone and is connected to the outlet pipe, and the central part of the split body contains a recess made with the possibility of placing a filter element (3) therein. 5 p.p. f-ly, 3 dwg

Description

Technology area

The utility model relates to air sampling devices, namely, devices for sampling polyaromatic hydrocarbons (PAHs) and suspended solids in industrial emissions.

State of the art

A device for sampling polycyclic aromatic hydrocarbons from gaseous media is known (copyright certificate SU 1397783 A1, G01N 1/00, publ. 05/23/1988). The device is equipped with an absorber made in the form of a cylindrical container with tangential inlet and outlet nozzles. The absorber is partially filled with an adsorbent and is equipped with a cylindrical rotor coaxially installed inside it, made in the form of a row of radial perforated blades.

The disadvantage of this device is the complexity of manufacturing the absorber. Such a design of the absorber does not ensure proper cleaning of the absorber and the possibility of prompt reloading. The device does not provide for the selection of other pollutants. The device does not provide for sampling in aeration lanterns.

Known device for sampling polycyclic aromatic hydrocarbons of combustion products of hydrocarbon fuels of thermal power plants (copyright certificate SU 1770810 A1, G01N 1/22, publ. 23.10.1992). The device is equipped with a sampler, filter element, counter and vacuum pump. The sampler is equipped with a removable insert installed inside it, made according to the shape and dimensions of the internal cavity of the sampler.

The disadvantage of this device is the design of the sampler, which does not allow sampling in conditions of isokinetic flows. The device does not contain a sorbent that allows sampling of gaseous polyaromatic hydrocarbons.

A device is known for sampling polycyclic aromatic hydrocarbons and other organic compounds, hydrogen fluorides and sulfur oxides and preparing samples for analysis (patent RU 2089869 C1, G01N 1/22, publ. 09/10/1997). The device is equipped with a gas intake, an adsorbing agent, a sample receiver and a sample preparation facility for analysis. The adsorbing means is made in the form of a cylindrical vessel filled with a solid sorbent, closed on both sides with lids. The adsorbent is provided with a layered structure to accommodate a solid sorbent. The means for preparing samples for analysis is equipped with a means for trapping moisture from the sample and a means for measuring the temperature during its sampling.

The disadvantage of this device is the design of the adsorbing agent, which does not allow the use of a large amount of finely dispersed sorbent. An adsorbent design that does not allow the use of a filter element to control the concentration of suspended solids.

Known universal sampler for air sampling (patent RU 49622 U1, G01N 1/22, publ. 27.11.2005). The device contains a container with openings opposite at the ends, a dosing element and a sorption unit consisting of a sorbent placed between two mesh frames made in the form of a glass. The sorption unit is made composite, consisting of separate removable annular sorption elements of the same height and diameters and an end sorption element with different sorbents.

The disadvantage of this device is the design of the sampler, which complicates the process of disassembling the sampler before and after sampling. The sampler is not designed to take samples of suspended solids.

The closest to the claimed technical solution (prototype) is an air sampling device (RF patent 73482 U1, G01N 1/22, publ. 20.05.2008). The device contains a housing, a metering element and a sorption unit. The sorption unit is made of a set of cylindrical sorption cartridges of the same geometric dimensions with different sorbents, placed in the sliding block in such a way that their axes of symmetry are parallel to the axis of the device, while at the outlet of the sorption cartridges, mesh elements with different pneumatic resistance are installed.

The disadvantage of this device is the design of the sampler, which does not allow the use of finely dispersed sorbent. An adsorbent design that does not allow the use of a filter element to control the concentration of suspended solids.

Disclosure of invention

The task of the utility model is to improve the accuracy of quantitative determination of the content of polyaromatic hydrocarbons in industrial emissions and to expand the functionality of the device by simultaneously taking a sample of suspended solids, for example, inorganic dust, insoluble fluorides, with a PAH sample.

The technical result is to increase the degree of sorption and reduce the time of sampling, since one device allows sampling of different pollutants.

The technical result is achieved due to the fact that in the device for air sampling, containing a split body with filtering and sorption elements placed in it, according to the claimed utility model, the lower part of the split body is connected to the inlet pipe and is made in the form of a truncated cone expanding towards the central part of the split body made in the form of a cylinder, the sorption element is made in the form of a sorption cartridge located between the central and upper parts of the split body, the upper part of the split body is made in the form of a truncated cone and is connected to the outlet pipe, and the central part of the split body contains a recess made with the possibility of placing a filter element in it.

The achievement of the technical result is facilitated by the fact that:

- sorption cassette can be made of metal or plastic;

- the sorption cassette is equipped inside its body with a ring with radially arranged stiffeners, while the ring is made with the possibility of placing a sorbent layer in it;

- the sorbent layer in the sorption cassette is placed between at least two filter elements;

- the filtering element, located in the recess of the central part of the body, is fixed in the split body by means of a pressure ring.

Aeration filters AFA VP-20, Whatman GF / A can be used as a filter element. The sorption unit is made in the form of a sorption cassette, which is equipped with an inner ring with radially located stiffening ribs, between which a solid sorbent is placed. To prevent sorbent leakage, the upper and lower plane of the ring is limited by filters of the AFA VP-20 or Whatman type. The height of the solid sorbent layer corresponds to the height of the inner ring. As a sorbent, aluminum oxide or a synthetic sorbent of the XAD type can be used. Due to the expansion of the diameter of the sampling device along the gas-air flow, the flow rate at the inlet to the sorption unit decreases, which increases the sorption efficiency.

Brief Description of Drawings

An industrial emission sampling device is illustrated by the following figures:

fig. 1 - General view of the sampling device,

fig. 2 - General view of the sorption cassette,

fig. 3 - top view of the sorption cassette,

where 1 is the case;

2 - sorption cassette;

3 - filter element;

4 - pressure ring of the body;

5 - the body of the sorption cassette, which consists of separate parts connected to each other by means of a thread;

6 - clamping ring of the sorption cassette;

7 - inner ring of the sorption cassette;

8 - stiffeners.

The device for sampling in industrial emissions consists of a detachable body 1, mirrored relative to the vertical axis, the parts of which are interconnected by means of a threaded connection (Fig. 1). The inlet of the gas-air mixture is carried out through a branch pipe located in the lower part of the cone-shaped part of the split casing 1. A cell is provided in the cylindrical central part of the casing of the sampling device to fix the filter element designed to control suspended matters. To prevent movement of the filter element during assembly of the device and to ensure the tightness of the device, a pressure ring 4 is used.

Sorption cassette 2 is the main operating element of the device, the body 5 of which consists of 2 parts. The cassette is equipped with a clamping ring of the cassette 6, an inner ring of the cassette 7 (Fig. 2). A filter element is inserted into the lower part of the cassette body, then the inner ring of the cassette 7 is inserted, into the space of which between the stiffening ribs the sorbent is poured, then the filter element is inserted, then the clamping ring of the cassette 6 is installed, the upper part of the cassette case is wound.

To control the alignment of the ribs of the cassette body, the inner ring of the cassette, the clamping ring of the cassette, a fixing element is provided on the inner side of the lower part of the cassette body, the diameter of which corresponds to the diameter of the recess of the inner ring of the cassette and the clamping ring of the cassette (Fig. 3).

The device works as follows. The air-gas mixture enters the sampling device through the fitting of the lower part of the body 1. During the sampling time, the suspended substances present in the gas-air mixture are deposited on the filter element installed in the body and fixed by the clamping ring 4. The sorbent in the sorption cassette 2 absorbs polyaromatic hydrocarbons. The sampling rate value is set constant by means of an aspiration device connected to the nozzle of the upper part of the housing 1. The sampling rate value can vary depending on the gas and dust flow rate of the atmospheric pollution source. After sampling, plugs are placed on the pipes of the upper and lower parts of the body 1.

To perform physical and chemical analysis of samples, the sampling device is disassembled, the cassette and the filter element are removed, designed to control suspended substances. The filter element is analyzed. Sorption cassette 2 is disassembled in the laboratory, the contents of the sorption cassette are analyzed.

The design of the sampling device allows the selection of several types of pollutants simultaneously by simultaneous filtration of suspended solids through the filter element installed in the cells of housing 1 and the sorption of PAHs in the sorption cassette, which leads to a decrease in the sampling time. The use of this sampling device allows to increase the accuracy of quantitative determination of the content of polyaromatic hydrocarbons in industrial emissions.

Claims (5)

1. A device for air sampling, containing a split casing (1) with filter and sorption elements placed in it, characterized in that the lower part of the split casing (1) is connected to the inlet pipe and is made in the form of a truncated cone expanding towards the central part of the split housing (1), made in the form of a cylinder, the sorption element is made in the form of a sorption cartridge (2) located between the central and upper parts of the split housing (1), the upper part of the split housing (1) is made in the form of a truncated cone and is connected to the outlet , and the central part of the split body contains a recess made with the possibility of placing a filter element (3) in it. 2. A device according to claim 1, characterized in that the sorption cassette is made of metal or plastic. 3. A device according to claim 1, characterized in that the sorption cassette is provided inside its body with a ring with radially arranged stiffening ribs (8), wherein the ring is made with the possibility of placing a sorbent layer in it. 4. A device according to claim 1, characterized in that the sorbent layer in the sorption cassette is placed between at least two filter elements. 5. The device according to claim. 1, characterized in that the filter element, located in the recess of the central part of the housing, is fixed in the split housing (1) by means of a clamping ring (4).

Images