Benzene closed sampling device

Abstract

The utility model provides a benzene closed sampling device which comprises a shell, a sampling bottle is arranged at the front end of the shell in a containing mode, a discharging pipe and a backflow pipe are distributed on the upper portion and the lower portion of the shell respectively, the end of the discharging pipe and the end of the backflow pipe are connected to the end of the sampling bottle, a fourth valve and a fifth valve are arranged on the discharging pipe, and the fourth valve and the fifth valve are connected with the sampling bottle. A first valve and a third valve are arranged on the backflow pipe, a parallel pipe is arranged in the shell, one end of the parallel pipe is fixedly connected with the discharging pipe, the connecting position of the parallel pipe and the discharging pipe is located between the fourth valve and the fifth valve, a nitrogen pipe is fixedly connected to the discharging pipe, the connecting position of the nitrogen pipe and the fifth valve is located between the fourth valve and the fifth valve, and a sixth valve is arranged on the nitrogen pipe. The other end of the parallel pipe is connected with the backflow pipe, the joint of the other end of the parallel pipe and the backflow pipe is located between the first valve and the third valve, and a second valve is arranged on the parallel pipe. According to the invention, by arranging a nitrogen purging structure and other related structures, the residual benzene in the pipeline is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of sampling device technology, and more particularly to a benzene closed sampling device. Background Technology

[0002] Benzene is an important raw material used in the synthesis of dyes, synthetic rubber, synthetic resins, synthetic fibers, synthetic grains, plastics, pharmaceuticals, pesticides, photographic film, and petrochemical products. Its production volume and technological level are indicators of a country's petrochemical development level. The ring system of benzene is called the benzene ring, which is the simplest aromatic ring.

[0003] Sampling and testing are required during the production and storage of benzene to obtain its quality. Benzene has a melting point of 5.5℃ and a boiling point of 80.1℃. During sampling, residues will remain in the pipeline. In winter, benzene may solidify in the pipeline, while in summer it is prone to vaporization, causing damage to the sampling pipeline, especially the valves, when benzene undergoes a phase change (pressure change within the pipeline). Summary of the Invention

[0004] To address the aforementioned problems, this invention discloses a closed benzene sampling device, comprising a housing, with a sampling bottle housed at the front end of the housing. A discharge pipe and a reflux pipe are respectively distributed at the upper and lower parts of the housing, with their ends connected to the ends of the sampling bottle. The discharge pipe is equipped with valves four and five, and the reflux pipe is equipped with valves one and three. Furthermore, valves one and four are positioned closer to the sampling bottle; during sampling, valves one, three, four, and five need to be opened. Valves are also located at the upper and lower ends of the sampling bottle, and these also need to be opened. Simultaneously, the sampling bottle is connected to the discharge and reflux pipes via push-button quick-connect fittings.

[0005] The shell contains a parallel pipe. One end of the parallel pipe is fixedly connected to the discharge pipe, with the connection point between valves four and five. A nitrogen pipe is fixedly connected to the discharge pipe, also with its connection point between valves four and five. A valve six is ​​installed on the nitrogen pipe. The other end of the parallel pipe is connected to the reflux pipe, with its connection point between valves one and three. A valve two is installed on the parallel pipe. After sampling, valves one and four are closed, the sampling bottle is removed, then valve five is closed and valve six is ​​opened. Nitrogen gas sequentially enters the discharge pipe, the parallel pipe, and the reflux pipe, blowing back any remaining benzene. Note that to ensure complete benzene reflux, both ends of the parallel pipe are positioned close to valves one and four, respectively, and valves four and five are positioned as close as possible to each other.

[0006] Preferably, a pressure gauge is installed on the discharge pipe, located between valve four and valve five, and valve seven is installed on the pipeline connecting the pressure gauge and the discharge pipe. During sampling, valve seven is opened, and the change in the pressure gauge reading ensures that benzene enters the sampling bottle.

[0007] Preferably, one end of the reflux tube is fixedly connected to an extension tube, and the other end of the extension tube is fixedly connected to the lower end of the sampling bottle. The extension tube facilitates connection to the sampling bottle. Furthermore, since the upper and lower ends of the sampling bottle are male and female connectors, the ends of the extension tube and the discharge tube are also male and female connectors. After sampling, the sampling bottle is removed, and the extension tube and discharge tube are connected. When nitrogen gas is introduced, it can be purged either through the parallel tube or through the extension tube. This significantly reduces benzene leakage.

[0008] Preferably, the housing has an airflow channel inside, with one side of the airflow channel located directly above the sampling bottle and having an opening there. A fan is positioned above the opening, and an adsorption structure is provided inside the other side of the airflow channel. During the sampling process, some benzene leakage is inevitable, so the fan draws air into the airflow channel, while the adsorption structure adsorbs as much of the leaked benzene as possible.

[0009] Preferably, the adsorption structure includes a frame, and a plurality of adsorption plates are equidistantly arranged inside the frame. The adsorption plates are composed of silica gel or activated carbon.

[0010] Preferably, the front of the housing is provided with a protective shell with an arc-shaped horizontal cross-sectional profile, and the protective shell is slidably disposed up and down. During and after sampling, the protective shell keeps the sampling area in a relatively enclosed state, reducing the emission of benzene.

[0011] The beneficial effects of this invention are as follows:

[0012] 1. It is equipped with valves for parallel pipes, nitrogen pipes, etc. After sampling, the pump can purge the remaining benzene in the pipeline back into the benzene storage tank to avoid damage caused by a large amount of benzene in the pipeline.

[0013] 2. Equipped with a fan, airflow channel, and adsorption structure, the leaked benzene is drawn into the adsorption structure during sampling, greatly reducing benzene escape and ensuring a safe production environment. Attached Figure Description

[0014] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0015] Figure 2 This is a three-dimensional schematic diagram of the adsorption structure of the present invention;

[0016] Figure 3 This is a schematic cross-sectional view of the housing of the present invention;

[0017] Figure 4 This is a schematic diagram of the pipeline connection of the present invention.

[0018] List of reference numerals in the attached diagram:

[0019] 1. Shell; 2. Extension tube; 3. Sampling bottle; 4. Valve 1; 5. Valve 2; 6. Valve 3; 7. Protective shell; 8. Adsorption structure; 9. Valve 4; 10. Valve 5; 11. Valve 6; 12. Airflow channel; 13. Opening; 14. Fan; 15. Return pipe; 16. Parallel pipe; 17. Valve 7; 18. Pressure gauge; 19. Nitrogen pipe; 20. Discharge pipe;

[0020] 81. Frame; 82. Adsorption plate. Detailed Implementation

[0021] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, and the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0022] like Figures 1 to 4 As shown, a benzene sealed sampling device includes a housing 1, which is generally rectangular in shape with a semi-circular front end. A sampling bottle 3 is housed at the front end of the housing 1. A discharge pipe 20 and a return pipe 15 are distributed at the upper and lower parts of the housing 1, respectively. The ends of the discharge pipe 20 and the return pipe 15 are connected to the ends of the sampling bottle 3. When sampling, the sampling bottle 3 is placed at the semi-circular part of the housing 1 and then connected to the discharge pipe 20 and the return pipe 15. The discharge pipe 20 is equipped with valve 4 (9) and valve 5 (10), and the return pipe 15 is equipped with valve 1 (4) and valve 3 (6). Opening valve 1 (4), valve 3 (6), valve 4 (9), and valve 5 (10) allows benzene to flow through the sampling bottle 3, thereby achieving benzene sampling.

[0023] The shell 1 is equipped with a parallel pipe 16. One end of the parallel pipe 16 is fixedly connected to the discharge pipe 20, and the connection is located between valve 4 9 and valve 5 10. A nitrogen pipe 19 is fixedly connected to the discharge pipe 20. The nitrogen pipe 19 is used to introduce nitrogen gas, and the connection is located between valve 4 9 and valve 5 10. A valve 6 11 is provided on the nitrogen pipe 19. The other end of the parallel pipe 16 is connected to the return pipe 15, and the connection is located between valve 1 4 and valve 3 6. A valve 2 5 is provided on the parallel pipe 16. During the sampling process, valve 2 5 is in a closed state.

[0024] After sampling, close valves 1-4, 4-9, and 5-10, while opening or keeping valves 2-5, 3-6, and 6-11 open. Nitrogen gas enters the discharge pipe 20, parallel pipe 16, and return pipe 15 in sequence to purge benzene back into the storage tank. Furthermore, to minimize benzene residue after purging, the end of parallel pipe 16 is positioned close to valves 1-1 and 4-9, and the pipeline between valves 4-9 and 5-10 is kept as short as possible.

[0025] A pressure gauge 18 is installed on the discharge pipe 20. The pressure gauge 18 measures the pressure in the pipeline. The pressure gauge 18 is located between valve 4 9 and valve 5 10. A valve 7 17 is installed on the pipeline connecting the pressure gauge 18 and the discharge pipe 20. When sampling, valve 7 17 is opened in advance, and the reading of the pressure gauge 18 is used to determine whether benzene is sent out.

[0026] One end of the reflux tube 15 is fixedly connected to an extension tube 2, and the other end of the extension tube 2 is fixedly connected to the lower end of the sampling bottle 3. The ends of the reflux tube 15 and the discharge tube 20 are both fixedly installed, and the sampling bottle 3 is also a rigid structure, so an extension tube 2 is provided. After the upper ends of the discharge tube 20 and the sampling bottle 3 are connected by a press-type connector, the bottom connection between the reflux tube 15 and the sampling bottle 3 is achieved by means of the extension tube 2.

[0027] Furthermore, the upper and lower ends of the sampling bottle 3 are equipped with male and female connectors. At this time, the end of the extension tube 2 is equipped with a male connector, while the end of the discharge tube 20 is equipped with a female connector. After sampling is completed, the extension tube 2 is directly connected to the discharge tube 20. At this time, during nitrogen purging, the opening and closing of the control valve allows nitrogen to pass through the extension tube 2, thus providing another path for nitrogen purging.

[0028] An air channel 12 is provided inside the housing 1. One side of the air channel 12 is located directly above the sampling bottle 3, and an opening 13 is provided there. A fan 14 is provided above the opening 13. During the sampling process, the fan 14 works to draw gas from the sampling bottle 3 upward through the opening 13. An adsorption structure 8 is provided inside the other side of the air channel 12, and the gas passes through the adsorption structure 8 to absorb the leaked benzene as much as possible.

[0029] The adsorption structure 8 includes a frame 81, inside which several adsorption plates 82 are equidistantly arranged. The adsorption plates 82 are made of activated carbon or silica gel. The adsorption structure 8 needs to be removed periodically for benzene removal treatment.

[0030] The front of the housing 1 is provided with a protective shell 7 with an arc-shaped horizontal cross-section, and the protective shell 7 is slidably mounted up and down. When installing or removing the sampling bottle 2, the protective shell 7 needs to be slid upward. In other states, the protective shell 7 is in the lower position, so that the sampling chamber is relatively closed, ensuring that the leaked benzene is sucked in by the fan 14 and passes through the adsorption structure 8.

[0031] The technical means disclosed in this invention are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features.

Claims

1. A benzene sealed sampling device, characterized in that, Includes a housing (1), the front end of which is provided with a sampling bottle (3), the upper and lower parts of the housing (1) are respectively provided with a discharge pipe (20) and a return pipe (15), the ends of the discharge pipe (20) and the return pipe (15) are connected to the ends of the sampling bottle (3), the discharge pipe (20) is provided with valve four (9) and valve five (10), and the return pipe (15) is provided with valve one (4) and valve three (6); The shell (1) is provided with a parallel pipe (16) inside. One end of the parallel pipe (16) is fixedly connected to the discharge pipe (20), and the connection is located between valve four (9) and valve five (10). A nitrogen pipe (19) is fixedly connected to the discharge pipe (20), and the connection is located between valve four (9) and valve five (10). A valve six (11) is provided on the nitrogen pipe (19). The other end of the parallel pipe (16) is connected to the return pipe (15), and the connection is located between valve one (4) and valve three (6). A valve two (5) is provided on the parallel pipe (16).

2. The benzene sealed sampling device according to claim 1, characterized in that: A pressure gauge (18) is installed on the discharge pipe (20). The pressure gauge (18) is located between valve four (9) and valve five (10). A valve seven (17) is installed on the pipeline connecting the pressure gauge (18) and the discharge pipe (20).

3. The benzene sealed sampling device according to claim 1, characterized in that: One end of the reflux tube (15) is fixedly connected to an extension tube (2), and the other end of the extension tube (2) is fixedly connected to the lower end of the sampling bottle (3).

4. The benzene sealed sampling device according to claim 1, characterized in that: An air channel (12) is provided inside the housing (1). One side of the air channel (12) is located directly above the sampling bottle (3), and an opening (13) is provided there. A fan (14) is provided above the opening (13). An adsorption structure (8) is provided inside the other side of the air channel (12).

5. A benzene sealed sampling device according to claim 4, characterized in that: The adsorption structure (8) includes a frame (81), and several adsorption plates (82) are equidistantly arranged inside the frame (81).

6. The benzene sealed sampling device according to claim 1, characterized in that: The front of the housing (1) is provided with a protective shell (7) with an arc-shaped horizontal cross-section, and the protective shell (7) is slidably disposed up and down.

Images