CN211317887U - Sampling device for aerosol migration mechanism test - Google Patents
Sampling device for aerosol migration mechanism test Download PDFInfo
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- CN211317887U CN211317887U CN201921971604.5U CN201921971604U CN211317887U CN 211317887 U CN211317887 U CN 211317887U CN 201921971604 U CN201921971604 U CN 201921971604U CN 211317887 U CN211317887 U CN 211317887U
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Abstract
The utility model relates to an aerosol test technical field in the containment specifically discloses a sampling device for aerosol migration mechanism is experimental. The device comprises a sampling head, a sampling connecting pipe and a sampling pipe, wherein the sampling head is of a shell cavity structure, a plurality of air inlets are uniformly distributed on the sampling head, one end of the sampling head is an integrally formed cylindrical sampling pipe connecting pipe, and the sampling pipe connecting pipe is fixedly arranged at the end part of the sampling pipe in a detachable mode; the sampling head can stir the sampling gas entering the cavity of the sampling head through the air inlet hole, so that the sampling gas is uniformly mixed. The device has solved the not enough of current straight tube formula sampling head in the aerosol migration mechanism test, adopts spherical, cylinder and disc sampling head structure to evenly trompil on its surface, form 360 sampling and admit air, reduced the disturbance of surrounding air current, can realize the homogeneous mixing of the interior gas of sampling head simultaneously, thereby improve the measuring degree of accuracy.
Description
Technical Field
The invention belongs to the technical field of aerosol tests in containment vessels, and particularly relates to a sampling device for an aerosol migration mechanism test.
Background
Aerosols are liquid or solid particles that can be suspended in a gas for extended periods of time, and the aerosol particles typically have a particle size of 0.001 to 100 μm. In the fields of meteorology, agriculture, medicine, environment, military and the like, the research on aerosol is more, and the concentration measurement and removal of aerosol particles are more concerned.
In the nuclear power field, radioactive fission products are released and migrated in the form of gas, steam and aerosol in a nuclear power plant under the condition of serious accidents. The aerosol is suspended in the gas space in the form of solid or liquid particles, is the main existing form of radioactive fission products, and the migration, removal (including removal by natural deposition and removal under the action of a safety special system) and distribution of the aerosol in the gas space of the containment directly influence radioactive source items finally released into the environment, so the aerosol is one of the key research directions in the field of reactor safety in the last two decades. The mechanism of aerosol migration mainly comprises: natural deposition behaviors such as collision, polymerization, condensation/evaporation, deposition, fragmentation, homogeneous nucleation and the like; growth, deposition, thermophoresis, diffusion and other physical and chemical phenomena.
To study these phenomena, related tests are usually performed to simulate environmental conditions in severe accidents of nuclear power plants and study aerosol migration behavior. The accuracy of aerosol sampling measurements during the test has a very large impact on aerosol behavior studies.
The international relevant experimental research mainly comprises: the international project PHEBUS FP supported by the european commission; DEMONA tests developed under the funding of the German Federal research and technology department (BMFT) and the U.S. Nuclear canal Association (USNRC); VANAM tests, carried out by the German FrankfurBattere institute in 1988-1993; the KAEVER project, conducted 1993-1997 by the Battelle institute of Frankfurt, Germany; AHMED test conducted by the Finnish Research center (Technical Research Centre of Finland, VTT); THAI test facilities (Thermal Hydraulics, Aerosols, Iodine), et al, of Eschborn, germany. The aerosol sampling heads used in these test facilities were all simple straight tubes.
In the aerosol migration mechanism test process, the number and the particle size distribution of aerosol particles at different positions in a test container can be measured by adjusting the insertion depth and the insertion position of the sampling pipe, but because the sampling process is a continuous process, the sampling in a single direction can cause a disturbance to the surrounding space. Since the aerosol migration mechanism test focuses on the distribution of aerosol particles in space, such unidirectional disturbance is undesirable for accurate measurement of particle concentration and particle size, and technical improvement is required.
Disclosure of Invention
The invention aims to provide a sampling device for an aerosol migration mechanism test, which can overcome the defects that the sampling airflow direction is consistent due to the sampling of the existing straight pipe, and the concentration and the particle size distribution of gas particles around a sampling point cannot be uniformly reflected.
The technical scheme of the invention is as follows: a sampling device for an aerosol migration mechanism test comprises a sampling head, a sampling connecting pipe and a sampling pipe, wherein the sampling head is of a shell cavity structure, a plurality of air inlets are uniformly distributed in the sampling head, one end of the sampling head is an integrally formed cylindrical sampling pipe connecting pipe, and the sampling pipe connecting pipe is fixedly arranged at the end part of the sampling pipe in a detachable mode; the sampling head can stir the sampling gas entering the cavity of the sampling head through the air inlet hole, so that the sampling gas is uniformly mixed.
The sampling head is a sampling head A with a hollow sphere structure; the sampling head A is uniformly provided with a plurality of air inlets, so that the sampling gas entering the spherical cavity of the sampling head A through the air inlets can be uniformly mixed.
The sampling head is a sampling head B with a cylindrical barrel structure; the wall of the cylinder of the sampling head B is uniformly provided with a plurality of air inlets, so that the sampling gas entering the cavity of the cylinder of the sampling head B through the air inlets is uniformly mixed.
The sampling head be disc shape's sampling head C, wherein, sampling head C be two disc structures, it is connected fixedly through a plurality of spliced pole that circumference was arranged, evenly open on one of them disc face has a plurality of inlet port, outside outstanding cylindrical tube shape sampling pipe connecting pipe that forms integrated into one piece in another disc center.
The side wall of the sampling pipe is coated with a cooling circulation system, so that the temperature of the sampling pipe is controlled.
The sampling pipe lateral wall cladding coolant tank the lower terminal surface of coolant tank open and to have the cooling water import the up end of coolant tank on open and to have the cooling water export, carry out temperature control through the circulating water in the cooling water tank to the sampling pipe.
The detachable connection mode of the sampling pipe and the sampling pipe connecting pipe comprises threaded connection, flange plate connection, socket connection and nested connection.
The sampling head A is applied to sampling in a spherical container or a large-space container.
The sampling head B is applied to sampling in a small-size cylindrical container.
The sampling head C is applied to sampling in a small-size rectangular container.
The invention has the following remarkable effects: the sampling device for the aerosol migration mechanism test solves the defects of the existing straight tube type sampling head in the aerosol migration mechanism test, adopts the spherical, cylindrical and disc-shaped sampling head structure, and uniformly opens holes on the surface of the sampling head structure to form 360-degree sampling air inlet, reduces the disturbance of peripheral air flow, and can realize uniform mixing of air in the sampling head, thereby improving the measurement accuracy.
Drawings
FIG. 1 is a schematic structural diagram of a sampling device for an aerosol transport mechanism test according to the present invention;
FIG. 2 is a schematic diagram of a sampling head structure for an aerosol transport mechanism test according to the present invention;
FIG. 3 is a schematic diagram of another sample head structure for aerosol transport mechanism testing according to the present invention;
FIG. 4 is a schematic diagram of a third sample head structure for an aerosol transport mechanism test according to the present invention;
FIG. 5 is a sectional view taken along line A-A of FIG. 4;
in the figure: 1. a sampling pipe connecting pipe; 2. an air inlet; 3. a sampling head; 4. a sampling tube; 5. a cooling water inlet; 6. a cooling water tank; 7. a cooling water outlet; 8. a sampling head A; 9. a sampling head B; 10. a sampling head C; 11. connecting columns.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
Example 1
As shown in fig. 1 and 2, a sampling device for aerosol migration mechanism test includes a sampling head 3, a sampling tube connecting tube 1 and a sampling tube 4, wherein the sampling head 3 is a sampling head A8 with a hollow sphere structure, a plurality of air inlets 2 are uniformly distributed thereon, one end of the sampling head A8 protrudes outwards to form an integrally formed cylindrical sampling tube connecting tube 1, the sampling tube connecting tube 1 is fixedly mounted at the end of the sampling tube 4 with a cylindrical tube structure through screw threads, a cooling water tank 6 is coated on the side wall of the sampling tube, a cooling water inlet 5 is opened on the lower end surface of the cooling water tank 6, a cooling water outlet 7 is opened on the upper end surface of the cooling water tank 6, and the sampling tube 4 is cooled by circulating water in the cooling water tank 6; the sampling head A8 is internally provided with a spherical cavity, and the sampled gas enters the spherical cavity through the gas inlet 2 to form a certain stirring state, so that the gas is uniformly mixed; the air inlets are uniformly distributed on the surface of the ball head, so that other samples can reflect the concentration and the particle size distribution of particles at the accessory of the sampling point; the sampling head A8 is suitable for sampling in spherical containers or large-space containers.
Example 2
As shown in fig. 1 and 3, a sampling device for an aerosol migration mechanism test includes a sampling head 3, a sampling tube connecting tube 1 and a sampling tube 4, wherein the sampling head 3 is a sampling head B9 of a cylindrical tube structure, a plurality of air inlets 2 are uniformly distributed thereon, a center of one end of the sampling head B9 protrudes outwards to form an integrally formed cylindrical sampling tube connecting tube 1, the sampling tube connecting tube 1 is fixedly mounted at an end of the sampling tube 4 of the cylindrical tube structure in a flange connection manner, a cooling water tank 6 is coated on a side wall of the sampling tube, a cooling water inlet 5 is formed on a lower end surface of the cooling water tank 6, a cooling water outlet 7 is formed on an upper end surface of the cooling water tank 6, and the sampling tube 4 is cooled by circulating water in the cooling water tank 6; the sampling head B9 is internally provided with a cylindrical cavity, and the sampled gas enters the cylindrical air cavity through the air inlet 2 to form a certain stirring state, so that the gas is uniformly mixed; the air inlets 2 are uniformly distributed on the surface of the cylindrical barrel, so that other samples can reflect the concentration and particle size distribution of particles at the accessory of the sampling point; the sampling head B9 is suitable for sampling in small size cylindrical containers.
Example 3
As shown in fig. 1, 4 and 5, a sampling device for aerosol migration mechanism test comprises a sampling head 3, a sampling tube connecting tube 1 and a sampling tube 4, wherein, the sampling head 3 is a disc-shaped sampling head C10, wherein, the sampling head C10 is a two-piece disc structure, which is fixedly connected through a plurality of connecting columns 11 which are arranged in the circumferential direction, a plurality of air inlets 2 are uniformly arranged on one disk surface, the center of the other disk protrudes outwards to form an integrally formed cylindrical sampling tube connecting pipe 1, wherein, the sampling pipe connecting pipe 1 is fixedly arranged at the end part of the sampling pipe 4 with a cylindrical tubular structure in a socket or nested connection mode, the side wall of the sampling pipe is coated with a cooling water tank 6, the lower end surface of the cooling water tank 6 is provided with a cooling water inlet 5, a cooling water outlet 7 is formed in the upper end face of the cooling water tank 6, and the sampling pipe 4 is cooled by circulating water in the cooling water tank 6; when the sampling head C10 samples, the sampling gas enters the sampling tube 4 through the gap between the two discs and the air inlet 2; the sampling head C10 is suitable for sampling in small-sized rectangular containers.
Claims (10)
1. A sampling device for aerosol migration mechanism test is characterized in that: the device comprises a sampling head (3), a sampling pipe connecting pipe (1) and a sampling pipe (4), wherein the sampling head (3) is of a shell cavity structure, a plurality of air inlets (2) are uniformly distributed on the sampling head, one end of the sampling head is an integrally formed cylindrical sampling pipe connecting pipe (1), and the sampling pipe connecting pipe (1) is fixedly arranged at the end part of the sampling pipe (4) in a detachable mode; the sampling head (3) can stir the sampling gas entering the cavity of the sampling head (3) through the air inlet hole (2), so that the sampling gas is uniformly mixed.
2. The sampling device for aerosol transport mechanism testing of claim 1, wherein: the sampling head (3) is a sampling head A (8) with a hollow sphere structure; the sampling head A (8) is uniformly provided with a plurality of air inlets (2), so that the sampling gas entering the spherical cavity of the sampling head A (8) through the air inlets (2) can be uniformly mixed.
3. The sampling device for aerosol transport mechanism testing of claim 1, wherein: the sampling head (3) is a sampling head B (9) with a cylindrical barrel structure; the cylinder wall of the sampling head B (9) is uniformly provided with a plurality of air inlets (2), so that the sampling gas entering the cylinder cavity of the sampling head B (9) through the air inlets (2) is uniformly mixed.
4. The sampling device for aerosol transport mechanism testing of claim 1, wherein: sampling head (3) be disc shape's sampling head C (10), wherein, sampling head C (10) be two disc structures, it is connected fixedly through a plurality of spliced pole (11) that circumference was arranged, evenly open on one of them disc face has a plurality of inlet port (2), outside outstanding cylinder tube-shape sampling pipe connecting pipe (1) that forms integrated into one piece in another disc center.
5. The sampling device for aerosol transport mechanism testing of claim 1, wherein: the side wall of the sampling pipe (4) is coated with a cooling circulation system, so that the temperature of the sampling pipe (4) is controlled.
6. A sampling device for aerosol transport mechanism testing according to claim 1 or 5, wherein: sampling pipe (4) lateral wall cladding coolant tank the lower terminal surface of coolant tank (6) open and to have cooling water inlet (5) the up end of coolant tank (6) on open and to have cooling water export (7), carry out temperature control through the circulating water among coolant tank (6) to sampling pipe (4).
7. The sampling device for aerosol transport mechanism testing of claim 1, wherein: the detachable connection mode of the sampling pipe (4) and the sampling pipe connecting pipe (1) comprises threaded connection, flange plate connection, socket connection and nested connection.
8. A sampling device for aerosol transport mechanism testing according to claim 2, wherein: the sampling head A (8) is applied to sampling in a spherical container or a large-space container.
9. A sampling device for aerosol transport mechanism testing according to claim 3, wherein: the sampling head B (9) is applied to sampling in a small-size cylindrical container.
10. The sampling device for testing an aerosol transport mechanism according to claim 4, wherein: the sampling head C (10) is applied to sampling in a small-size rectangular container.
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| CN201921971604.5U CN211317887U (en) | 2019-11-15 | 2019-11-15 | Sampling device for aerosol migration mechanism test |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110702471A (en) * | 2019-11-15 | 2020-01-17 | 中国原子能科学研究院 | Sampling device for aerosol migration mechanism test |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110702471A (en) * | 2019-11-15 | 2020-01-17 | 中国原子能科学研究院 | Sampling device for aerosol migration mechanism test |
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