Sealing gas sampling device in cold box

Abstract

According to the sealing gas sampling device in the cold box provided by the utility model, the sampling pipeline is used as a gas sampling medium, and the gas inlet holes are uniformly formed in the sampling pipeline, so that gas flows out from the connecting pipe at one end of the sampling pipeline and is further collected by the sampling device. An operator does not need to hold the sampling device by hand for sampling, so that the overall efficiency is improved. In addition, due to the fact that the total area of the air inlet holes is large, the flow speed of gas passing through the air inlet holes is low, the possibility that pearlife enters the sampling device along with the gas to block a valve can be effectively reduced, the pearlife in the gas cannot block the valve of the sampling device easily, the service life of the sampling device is prolonged, and the sampling device is suitable for large-scale industrial use and popularization.

Description

Technical Field

[0001] The utility model belongs to the field of air separation devices, in particular to a sealed gas sampling device in a cold box. Background Art

[0002] The fractionating towers and heat exchangers in the air separation unit operate at ultra-low temperatures, reaching as low as -196°C. Therefore, these cryogenic devices and the connected piping must be placed in a cold box filled with pearlescent sand. During operation, the cold box's seal gas pressure must be monitored. Excessively high pressure indicates a possible leak, while excessively low pressure could allow moist air to enter the cold box. The seal gas composition must also be tested to determine if a leak is present. Therefore, sampling from the cold box is necessary for analysis.

[0003] In existing technology, sampling is typically performed directly by operators holding a sealed gas detection instrument through the instrument's sampling tube, making it difficult to effectively ensure sampling quality. Furthermore, the thin instrument tube, with a maximum diameter of only 18mm, results in longer sampling times, further reducing overall efficiency. Furthermore, increasing the sampling flow rate can cause pearlescent abrasive to enter the instrument tube, which can accumulate over time and easily clog the sealed gas detection instrument's valve. Utility Model Content

[0004] The purpose of the utility model is to provide a sealing gas sampling device in a cold box to solve the problems in the prior art of low sampling efficiency and easy clogging of the valve of the sealing gas detection instrument during sampling.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A sealed gas sampling device in a cold box comprises a sampling pipe, wherein a plurality of air inlet holes are provided on the sampling pipe.

[0007] Both ends of the sampling pipe are sealed closed ends, one of which is provided with a through hole, and a connecting pipe is sealed and installed in the through hole; the end of the connecting pipe away from the sampling pipe can be connected to the sampling pipe of the sealed gas detection instrument;

[0008] The sampling pipe is wrapped with a filter net.

[0009] The utility model also has the following features:

[0010] Furthermore, both ends of the sampling pipe are sealed with a matching circular sealing plate; a through hole is opened in the middle of one of the sealing plates.

[0011] Furthermore, the filter screen is fixedly mounted on the sampling pipe via at least one throat clamp.

[0012] Furthermore, the filter screen is fixedly mounted on the sampling pipe via two throat clamps.

[0013] The two throat clamps are respectively located at both ends of the sampling pipeline.

[0014] Furthermore, the plurality of air inlet holes are evenly distributed along the axial and circumferential directions of the sampling pipe.

[0015] Compared with the prior art, the present invention has the following technical effects:

[0016] The utility model relates to a sealed gas sampling device in a cold box. The sampling pipe is used as a gas sampling medium, and air inlet holes are evenly arranged on the sampling pipe, so that the gas flows out from the connecting pipe at one end of the sampling pipe and is then collected by the sampling device. The operator is no longer required to hold a sealed gas detection instrument for sampling, which improves overall efficiency. In addition, since the total area of the air inlet holes is large, the flow rate of the gas passing through the air inlet holes is low, which can effectively reduce the possibility of pearlescent sand entering the sampling device with the gas and then clogging the valve. As a result, the pearlescent sand in the gas is not easy to clog the valve of the sampling device, which extends the service life of the sampling device and is suitable for large-scale use and promotion in industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the sealed gas sampling device in the cold box of the present invention.

[0018] The meanings of the numbers in the figure are: 1. Sampling pipe; 2. Air inlet; 3. Connecting pipe; 4. Filter; 5. Sealing plate; 6. Hose clamp. DETAILED DESCRIPTION

[0019] It should be noted that, unless otherwise specified, all components in the present invention are components known in the prior art. For example, the throat hoop is a known and commonly used throat hoop.

[0020] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent modifications made on the basis of the technical solution of this application fall within the scope of protection of the present invention.

[0021] A sealed gas sampling device in a cold box, such as Figure 1 As shown, it includes a sampling pipe 1, and a plurality of air inlet holes 2 are evenly distributed on the sampling pipe 1;

[0022] Both ends of the sampling pipe 1 are sealed closed ends, one of which is provided with a through hole, in which a connecting pipe 3 is sealed and installed; the connecting pipe 3 can be connected to the sampling pipe of the sealed gas detection instrument.

[0023] The sampling pipe 1 is wrapped with a filter screen 4 .

[0024] The sealed gas sampling device in the cold box of the present invention uses the sampling pipe 1 as the gas sampling medium, and evenly opens the air inlet holes 2 on the sampling pipe 1, so that the gas flows out from the connecting pipe 3 at one end of the sampling pipe 2 and is then collected by the sealed gas detection instrument. The operator is no longer required to hold the sealed gas detection instrument for sampling, which improves the overall efficiency. In addition, since the total area of the air inlet holes is large, the flow rate of the gas when passing through the air inlet holes is low, which can effectively reduce the possibility of pearlescent sand entering the sampling device with the gas and then clogging the valve. The pearlescent sand in the gas is not easy to clog the valve of the sampling device, which extends the service life of the sampling device and is suitable for large-scale use and promotion in industry.

[0025] Specifically, the plurality of air inlet holes 2 are evenly distributed along the axial and circumferential directions of the sampling pipe 1 , so that the air intake is more uniform.

[0026] Specifically, both ends of the sampling pipe 1 are sealed with a matching circular sealing plate 5; a through hole is opened in the middle of one of the sealing plates 5.

[0027] As a preferred solution, the sampling pipe 1 and the filter screen 4 are fixedly connected by at least one hose clamp 6. Strengthening the connection strength between the filter screen 4 and the sampling pipe 1 makes the filter screen 4 not easy to fall off, thereby ensuring the filtering effect of the pearl sand.

[0028] More preferably, the sampling pipe 1 and the filter screen 4 are fixedly connected by two hose clamps 6; the two hose clamps 6 are respectively located on both sides of the sampling pipe 1. This further improves the connection strength between the filter screen 4 and the sampling pipe 1.

Claims

1. A sealed gas sampling device in a cold box, characterized in that: It comprises a sampling pipe (1), wherein a plurality of air inlet holes (2) are provided on the sampling pipe (1); Both ends of the sampling pipe (1) are sealed closed ends, one of which is provided with a through hole, and a connecting pipe (3) is sealed and installed in the through hole; the end of the connecting pipe (3) away from the sampling pipe (1) can be connected to the sampling pipe of the sealed gas detection instrument; The sampling pipe (1) is wrapped with a filter screen (4).

2. The sealed gas sampling device in the cold box according to claim 1, characterized in that: Both ends of the sampling pipe (1) are sealed with a matching circular sealing plate (5); a through hole is provided in the middle of one of the sealing plates (5).

3. The sealed gas sampling device in the cold box according to claim 1, characterized in that: The filter screen (4) is fixedly mounted on the sampling pipe (1) via at least one throat clamp (6).

4. The sealed gas sampling device in the cold box according to claim 3, characterized in that: The filter screen (4) is fixedly mounted on the sampling pipe (1) via two throat clamps (6); The two throat clamps (6) are respectively located at both ends of the sampling pipe (1).

5. The sealed gas sampling device in the cold box according to claim 1, characterized in that: The plurality of air inlet holes (2) are evenly distributed along the axial and circumferential directions of the sampling pipe (1).

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