CN211317887U - A sampling device for aerosol migration mechanism test - Google Patents

Abstract

The utility model relates to the technical field of aerosol test in a containment, and specifically discloses a sampling device for aerosol migration mechanism test. The device includes a sampling head, a sampling connecting pipe and a sampling pipe, wherein the sampling head is a shell cavity structure with a number of air inlet holes evenly distributed thereon, and one end of the sampling head is connected to a cylindrical sampling pipe formed integrally The sampling pipe connecting pipe is fixed at the end of the sampling pipe in a detachable manner; the sampling head can turbid the sampling gas entering the cavity of the sampling head through the air inlet, so that the sampling gas is uniform mix. The device solves the shortcomings of the existing straight-tube sampling head in the aerosol migration mechanism test. It adopts spherical, cylindrical and disc-shaped sampling head structures, and uniformly opens holes on its surface to form a 360° sampling air intake. , reducing the disturbance of the surrounding air flow, and at the same time, the gas in the sampling head can be uniformly mixed, thereby improving the accuracy of the measurement.

Description

A sampling device for aerosol migration mechanism test

technical field

The invention belongs to the technical field of aerosol test in a containment, in particular to a sampling device used for aerosol migration mechanism test.

Background technique

Aerosols are liquid or solid particles that can be suspended in gas for a long time, and the particle size of aerosol particles is generally 0.001 μm to 100 μm. In the fields of meteorology, agriculture, medicine, environment, and military, there are many studies on aerosols, and more attention is paid to the concentration measurement and removal of aerosol particles.

In the field of nuclear power, under severe accident conditions, radioactive fission products are released and migrated in the form of gaseous, vapor, and aerosol. Among them, aerosols are suspended in the gas space in the form of solid or liquid particles, and are the main form of radioactive fission products. Their migration and removal in the containment gas space (including natural deposition removal and removal under the action of a special safety system) ) and distribution directly affect the final radioactive source term released into the environment. Therefore, aerosols have been one of the key research directions in the field of reactor safety in the past two decades. The mechanism of aerosol migration mainly includes: natural deposition behaviors such as collision, polymerization, condensation/evaporation, deposition, fragmentation, and homogeneous nucleation; physical and chemical phenomena such as growth, deposition, thermophoresis, diffusiophoresis, and diffusion.

In order to study these phenomena, relevant experiments are usually carried out to simulate the environmental conditions under severe accidents in nuclear power plants, and to study the aerosol migration behavior. The accuracy of aerosol sampling measurements during the experiment has a great impact on the study of aerosol behavior.

The relevant international experimental research mainly includes: the PHEBUS FP international plan supported by the European Commission; the DEMONA test funded by the German Federal Ministry of Research and Technology (BMFT) and the United States Nuclear Regulatory Commission (USNRC); The VANAM test carried out in 2009; the KAEVER project carried out by the Battelle Institute in Frankfurt, Germany from 1993 to 1997; the AHMED test carried out by the Technical Research Centre of Finland (VTT); the THAI test facility in Eschborn, Germany (Thermal Hydraulics, Aerosols, Iodine), et al. The aerosol sampling heads used in these test facilities are all simple straight pipes.

During the aerosol migration mechanism test, the number and particle size distribution of aerosol particles at different positions in the test container can be measured by adjusting the depth and position of the sampling tube. However, since the sampling process is a continuous process, a single direction The sampling of will create a perturbation in the surrounding space. Since aerosol migration mechanism experiments focus on the spatial distribution of aerosol particles, such single-directional disturbance is not expected for accurate measurement of particle concentration and particle size, and technical improvements are required.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a sampling device for aerosol migration mechanism test, which can overcome the fact that the existing straight pipe sampling causes the sampling airflow direction to be consistent, and cannot uniformly reflect the gas particle concentration and particle size distribution around the sampling point.

The technical scheme of the present invention is as follows: a sampling device for aerosol migration mechanism test, the device includes a sampling head, a sampling connecting pipe and a sampling pipe, wherein the sampling head is a shell cavity structure, on which a plurality of uniformly distributed There are two air inlet holes, one end of the sampling head is an integrally formed cylindrical sampling pipe connecting pipe, and the sampling pipe connecting pipe is fixed on the end of the sampling pipe in a detachable manner; the sampling head can The sampling gas entering the cavity of the sampling head through the air inlet is turbid, so that the sampling gas is evenly mixed.

The sampling head is a sampling head A with a hollow spherical structure; the sampling head A is evenly provided with a number of air inlet holes, so that the sampling gas entering the spherical cavity of the sampling head A through the air inlet holes can be uniformly mixed .

The sampling head is a sampling head B with a cylindrical structure; the cylindrical wall of the sampling head B is evenly opened with a number of air inlet holes, so that the sampling head B enters the cylinder cavity of the sampling head B through the air inlet holes. The gases are uniformly mixed.

The sampling head is a disk-shaped sampling head C, wherein the sampling head C is a two-piece disk structure, which is connected and fixed by several connecting columns arranged in the circumferential direction, and is evenly distributed on one of the disk surfaces. A number of air inlet holes are opened, and the center of the other disc protrudes outward to form an integrally formed cylindrical sampling pipe connecting pipe.

The side wall of the sampling tube is covered with a cooling circulation system to realize temperature control of the sampling tube.

The side wall of the sampling pipe is covered with a cooling water tank, a cooling water inlet is opened on the lower end surface of the cooling water tank, and a cooling water outlet is opened on the upper end surface of the cooling water tank, and the circulating water in the cooling water tank passes through. Temperature control of the sampling tube.

The detachable connection modes of the sampling pipe and the sampling pipe connecting pipe include screw connection, flange connection, socket connection and nested connection.

The sampling head A is used for sampling in spherical containers or large space containers.

The sampling head B is used for sampling in small-sized cylindrical containers.

The sampling head C is used for sampling in small-sized rectangular containers.

The significant effect of the invention is that: the sampling device used for the aerosol migration mechanism test of the invention solves the deficiencies of the existing straight-tube sampling head in the aerosol migration mechanism test, and adopts spherical, cylindrical and The disc-shaped sampling head has a uniform opening on its surface to form a 360° sampling inlet, which reduces the disturbance of the surrounding air flow, and at the same time can achieve uniform mixing of the gas in the sampling head, thereby improving the measurement accuracy.

Description of drawings

1 is a schematic structural diagram of a sampling device for aerosol migration mechanism test according to the present invention;

2 is a schematic structural diagram of a sampling head used for aerosol migration mechanism test according to the present invention;

3 is a schematic structural diagram of another sampling head used for aerosol migration mechanism test according to the present invention;

4 is a schematic structural diagram of the third sampling head used for aerosol migration mechanism test according to the present invention;

Fig. 5 is A-A sectional view in Fig. 4;

In the figure: 1. Sampling pipe connecting pipe; 2. Air inlet; 3. Sampling head; 4. Sampling pipe; 5. Cooling water inlet; 6. Cooling water tank; 7. Cooling water outlet; 8. Sampling head A; 9 , sampling head B; 10, sampling head C; 11, connecting column.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

Example 1

As shown in Figures 1 and 2, a sampling device for aerosol migration mechanism test includes a sampling head 3, a sampling pipe connecting pipe 1 and a sampling pipe 4, wherein the sampling head 3 is a sampling head A8 with a hollow spherical structure, There are several air inlet holes 2 evenly distributed on it, and one end of the sampling head A8 protrudes outward to form an integrally formed cylindrical sampling pipe connecting pipe 1, wherein the sampling pipe connecting pipe 1 is connected by threads and is fixedly installed in the cylindrical tubular structure. The end of the sampling pipe 4 is covered with a cooling water tank 6 on the side wall of the sampling pipe, a cooling water inlet 5 is opened on the lower end surface of the cooling water tank 6, and a cooling water outlet 7 is opened on the upper end surface of the cooling water tank 6. The circulating water in the water tank 6 cools the sampling tube 4; the interior of the sampling head A8 is a spherical cavity, and the sampling gas enters the spherical air cavity through the air inlet 2, forming a certain turbidity to make the gas evenly mixed; the air intake holes are evenly distributed in The surface of the spherical head, therefore, sampling other particles can reflect the concentration and particle size distribution of the sampling point attachment; the sampling head A8 is suitable for sampling in spherical containers or large space containers.

Example 2

As shown in Figures 1 and 3, 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 B9 with a cylindrical structure , there are several air inlet holes 2 evenly distributed on it, and the center of one end of the sampling head B9 protrudes outward to form an integrally formed cylindrical sampling pipe connecting pipe 1, wherein the sampling pipe connecting pipe 1 is connected by a flange plate and is fixedly installed At the end of the sampling pipe 4 of the cylindrical tubular structure, a cooling water tank 6 is covered on the side wall of the sampling pipe, a cooling water inlet 5 is opened on the lower end surface of the cooling water tank 6, and a cooling water inlet 5 is opened on the upper end surface of the cooling water tank 6 Outlet 7, the sampling tube 4 is cooled by the circulating water in the cooling water tank 6; the interior of the sampling head B9 is a cylindrical cavity, and the sampling gas enters the cylindrical air cavity through the air inlet 2, forming a certain turbidity, making the gas Uniform mixing; the air inlet holes 2 are evenly distributed on the surface of the cylinder, so sampling other particles that can reflect the concentration and particle size distribution of the sampling point accessories; the sampling head B9 is suitable for sampling in small-sized cylindrical containers.

Example 3

As shown in Figure 1, Figure 4, Figure 5, a sampling device for aerosol migration mechanism test includes a sampling head 3, a sampling pipe connecting pipe 1 and a sampling pipe 4, wherein the sampling head 3 is a disk-shaped sampling The head C10, wherein the sampling head C10 is a two-piece disc structure, which is connected and fixed by a plurality of connecting columns 11 arranged in the circumferential direction. The center protrudes outward to form an integrally formed cylindrical sampling tube connecting tube 1, wherein the sampling tube connecting tube 1 is fixedly installed at the end of the sampling tube 4 of the cylindrical tubular structure through a socket or nested connection. The side wall of the pipe is covered with a cooling water tank 6, a cooling water inlet 5 is opened on the lower end face of the cooling water tank 6, and a cooling water outlet 7 is opened on the upper end face of the cooling water tank 6. 4. Cool down; when the sampling head C10 is sampling, the sampling gas enters the sampling pipe 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, 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 The shell cavity structure has a plurality of air inlet holes (2) evenly distributed thereon, one end of the sampling head is integrally formed with a cylindrical sampling pipe connecting pipe (1), and the sampling pipe connecting pipe (1) It is fixed at the end of the sampling tube (4) in a detachable manner; the sampling head (3) can turbulize the sampling gas entering the cavity of the sampling head (3) through the air inlet (2), so that the The sample gas is uniformly mixed. 2. A sampling device for aerosol migration mechanism test according to claim 1, characterized in that: the sampling head (3) is a sampling head A (8) of a hollow sphere structure; A plurality of air inlet holes (2) are evenly opened on the head A (8), so that the sampling gas entering the spherical cavity of the sampling head A (8) through the air inlet holes (2) can be uniformly mixed. 3. A sampling device for aerosol migration mechanism test according to claim 1, characterized in that: the sampling head (3) is a sampling head B (9) with a cylindrical structure; the A plurality of air inlet holes (2) are evenly opened on the cylindrical wall of the sampling head B (9), so that the sampling gas entering the cylindrical cavity of the sampling head B (9) through the air inlet holes (2) is uniformly mixed. 4. A sampling device for aerosol migration mechanism test according to claim 1, characterized in that: the sampling head (3) is a disk-shaped sampling head C (10), wherein the sampling head (3) The sampling head C (10) is a two-piece disc structure, which is connected and fixed by a plurality of connecting columns (11) arranged in the circumferential direction. The center of a disk protrudes outward to form an integrally formed cylindrical sampling pipe connecting pipe (1). 5. A sampling device for aerosol migration mechanism test according to claim 1, characterized in that: the side wall of the sampling pipe (4) is covered with a cooling circulation system, so as to realize the detection of the sampling pipe (4) temperature control. 6. A sampling device for aerosol migration mechanism test according to claim 1 or 5, characterized in that: the side wall of the sampling pipe (4) is covered with a cooling water tank, and in the cooling water tank (4) 6) A cooling water inlet (5) is opened on the lower end surface of the cooling water tank (6), and a cooling water outlet (7) is opened on the upper end surface of the cooling water tank (6). 4) Carry out temperature control. 7. A sampling device for aerosol migration mechanism test according to claim 1, characterized in that: the detachable connection mode of the sampling pipe (4) and the sampling pipe connecting pipe (1) comprises a threaded connection , flange connection, socket connection and nested connection. 8 . The sampling device for aerosol migration mechanism test according to claim 2 , wherein the sampling head A ( 8 ) is used for sampling in a spherical container or a large space container. 9 . 9 . The sampling device for aerosol migration mechanism test according to claim 3 , wherein the sampling head B ( 9 ) is used for sampling in a small-sized cylindrical container. 10 . 10 . The sampling device for aerosol migration mechanism test according to claim 4 , wherein the sampling head C ( 10 ) is used for sampling in small-sized rectangular containers. 11 .

Images