Liquefied gas sampling equipment

Abstract

The utility model relates to liquefied gas sampling equipment which comprises a pipeline with a first end and a second end which are opposite to each other, and the first end is used for receiving liquid from a liquefied gas source; the sample output device is connected with the second end of the pipeline so as to receive gas formed by vaporizing the liquid from the pipeline as a sample and output the sample to the sampling container; the adjusting valves are sequentially arranged on the pipeline in the flowing direction of fluid in the pipeline and used for adjusting and controlling the flow of the fluid in the pipeline, and the concentration detection device is used for detecting the concentration of liquefied gas in the fluid in the pipeline; the temperature detection device and the pressure detection device are arranged on the pipeline between the regulating valve and the concentration detection device and are respectively used for detecting the temperature and the pressure of the fluid in the pipeline. The liquefied gas sampling equipment disclosed by the utility model is simple in structure and simple and convenient to operate, can accurately control the flow, the temperature and the pressure of a sample during sampling, and improves the accuracy, the safety, the rapidness and the reliability of sampling detection.

Description

Technical Field

[0001] The utility model relates to the technical field of liquefied gas sampling, and more particularly to a liquefied gas sampling device for extracting samples from a liquefied gas source for detection. Background Art

[0002] In fields such as biopharmaceuticals, cryogenic liquefied gases such as liquid nitrogen, liquid oxygen, liquid hydrogen, and liquid carbon dioxide (also simply referred to as "liquefied gases" in this article) are widely used as important coolants in various production processes to, for example, perform cryopreservation on products such as biological cells. To ensure the quality of product preservation, it is necessary to use qualified cryogenic liquefied gases. For this purpose, the liquid supplied by the liquefied gas source can be sampled and detected to ensure that the liquefied gas used has qualified components and concentrations.

[0003] However, the characteristics and use environment of cryogenic liquefied gases often make their sampling and detection complex and critical. Existing liquefied gas sampling and detection methods are either simple and rough, and can only determine whether the liquid supplied from the liquefied gas source is generally a certain liquefied gas, or are complex in operation and have high safety risks during sampling, making it difficult to achieve sampling and detection efficiently and safely. Summary of the Utility Model

[0004] The purpose of the utility model is to solve at least one of the above problems and / or other defects existing in the prior art.

[0005] To achieve the above purpose, the utility model provides a liquefied gas sampling device, which includes: a pipeline having a first end and a second end opposite to each other, the first end being configured to receive liquid from a liquefied gas source; a sample output device connected to the second end of the pipeline to receive, as a sample, the gas vaporized from the liquid in the pipeline and output the sample to a sampling container; at least one regulating valve arranged on the pipeline in sequence along the flow direction of the fluid in the pipeline for regulating the flow rate of the fluid in the pipeline and a concentration detection device for detecting the concentration of the liquefied gas in the fluid in the pipeline; and a temperature detection device and a pressure detection device arranged on the pipeline between the regulating valve and the concentration detection device in the flow direction for detecting the temperature and pressure of the fluid in the pipeline respectively.

[0006] According to an embodiment of the utility model, the at least one regulating valve includes a first regulating valve and a second regulating valve arranged downstream of the first regulating valve in the flow direction, and the second regulating valve has a smaller flow rate adjustment range and a higher flow rate adjustment accuracy than the first regulating valve.

[0007] According to an embodiment of the present utility model, the temperature detection device and the second regulating valve are integrally arranged together.

[0008] According to an embodiment of the present utility model, the liquefied gas sampling device further includes a first safety relief valve arranged on the pipeline upstream of the at least one regulating valve in the flow direction, and / or a second safety relief valve arranged on the pipeline between the at least one regulating valve and the concentration detection device in the flow direction.

[0009] According to an embodiment of the present utility model, the pressure detection device and the second safety relief valve are integrally arranged together.

[0010] According to an embodiment of the present utility model, the sample output device includes a pipe fitting having a straight section and a bent section connected to each other. The straight section has an inlet communicating with the second end of the pipeline and extends upward from the second end. The bent section is bent relative to the straight section by at least 90 degrees and has an outlet serving as a sample output port.

[0011] According to an embodiment of the present utility model, a sampling regulating valve for adjusting the sample output flow rate is arranged on the pipe fitting.

[0012] According to an embodiment of the present utility model, a residual fluid discharge port for discharging the residual fluid in the pipeline is further arranged on the pipeline.

[0013] According to an embodiment of the present utility model, the pipeline is a rigid straight pipe supported by a support in a horizontal posture.

[0014] According to an embodiment of the present utility model, the liquefied gas sampling device further includes a hose connecting the first end of the pipeline to the liquefied gas source.

[0015] The liquefied gas sampling device according to the present utility model has a simple structure and convenient operation. During sampling, it can accurately control the flow rate, temperature, and pressure of the sample, measure the concentration of the liquefied gas at the same time, and also adopts multiple safety protection measures, improving the accuracy, safety, speed, and reliability of sampling detection. It can ensure the personal safety of operators and the smooth and efficient progress of the sampling process, especially bringing a new liquefied gas sampling experience to biopharmaceutical enterprises and meeting the high-quality requirements of the biopharmaceutical industry for products. Description of the Drawings

[0016] The features and advantages of the present utility model will be clearly understood through the following detailed description with reference to the accompanying drawings. It should be understood that the following drawings are merely schematic and not necessarily drawn to scale, and thus cannot be regarded as a limitation to the present utility model, where:

[0017] Figure 1 Schematic diagram of a liquefied gas sampling device according to an embodiment of the present utility model.

[0018] Description of reference numerals:

[0019] 1, pipeline; 11, first regulating valve; 12, second regulating valve; 13, temperature detection device; 14, pressure detection device; 15, concentration detection device; 16, first safety relief valve; 17, second safety relief valve; 18, support; 19, residual discharge port; 2, sample output device; 21, straight section of pipe fitting; 22, bent section of pipe fitting; 23, sampling regulating valve; 211, inlet; 222, outlet; 3, hose. Detailed implementation manners

[0020] Embodiments of the present utility model will be described below with reference to the accompanying drawings. In the following description, many specific details are set forth in order to enable those skilled in the art to more fully understand and implement the present utility model. However, it is obvious to those skilled in the art that some of these specific details may not be required for the implementation of the present utility model. In addition, it should be understood that the present utility model is not limited to the specific embodiments described. On the contrary, any combination of the features and elements described below can be considered for implementing the present utility model, regardless of whether they relate to different embodiments. Therefore, the aspects, features, embodiments, and advantages described below are for illustrative purposes only and should not be regarded as elements or limitations of the claims, unless expressly recited in the claims.

[0021] Figure 1 Schematically shown is a liquefied gas sampling device according to an embodiment of the present utility model. The liquefied gas sampling device is used to extract a liquefied gas sample from a liquefied gas source (such as a liquid nitrogen vehicle, a liquid nitrogen tower, a liquid carbon dioxide vehicle, a liquid carbon dioxide tower, etc.) for detection, so as to confirm that the liquid supplied by the liquefied gas source is indeed a cryogenic liquefied gas with qualified components and concentration. In the present application, "cryogenic liquefied gas" refers to a liquefied gas with a temperature lower than -70°C under normal pressure, including but not limited to liquid nitrogen, liquid oxygen, liquid hydrogen, liquid carbon dioxide, etc. In this document, "cryogenic liquefied gas" is also simply referred to as "liquefied gas".

[0022] As Figure 1 shown, the liquefied gas sampling device mainly includes a pipeline 1 and a sample output device 2 connected to each other. The pipeline 1 is used to receive the liquid led out from the liquefied gas source (normally mainly composed of the desired liquefied gas, such as liquid nitrogen) and allow the liquid to be heated and vaporized into a gaseous state (with a lower risk of harm to operators than cryogenic liquefied gas). At least a part of the gas can be extracted at the sample output device 2 for further detection and analysis.

[0023] The pipeline 1 has two opposite ends, which are referred to as the first end and the second end herein. It is easy to understand that both ends are open and can be used as the inlet and outlet of the pipeline 1 respectively. The first end of the pipeline 1 ( Figure 1 the left end in) is configured to receive liquid from a liquefied gas source. For this purpose, the first end of the pipeline 1 can be connected to a liquefied gas source (not shown) through a hose 3, for example, as Figure 1 shown. The hose 3 can be made of stainless steel, for example. The diameter of the front end of the hose 3 connected to the liquefied gas source can be adapted and adjusted according to the size of the liquid outlet of the liquefied gas source, while the diameter of the rear end of the hose 3 connected to the pipeline 1 can be adapted and adjusted according to the size of the first end of the pipeline 1. In one embodiment, the hose 3 can have an overall diameter of about 10 cm and a length of about 1.5 m. Using the hose 3 is beneficial to achieve a flexible and convenient connection between the pipeline 1 and the liquefied gas source, which facilitates the adjustment of the relative position between the two. The second end of the pipeline 1 ( Figure 1 the right end in) is connected to the sample output device 2, so that the sample output device 2 can receive gas from the pipeline 1 as a sample.

[0024] In Figure 1 the shown embodiment, the pipeline 1 is a rigid straight pipe (for example, a hard pipe made of stainless steel material), and can be supported in a horizontal posture by a plurality of supports 18. The length can be about 2 m, for example, and the diameter can be about 10 cm, for example. Of course, the present invention is not limited to this. According to different sampling requirements and actual situations, the pipeline 1 can also be made of other appropriate materials, have other dimensions or even have an appropriate curvature, or be arranged in other postures (such as an inclined posture), as long as it can receive an appropriate amount of liquid from the liquefied gas source and vaporize at least part of it into gas for sampling.

[0025] In order to be able to receive an appropriate amount of liquid from the liquefied gas source and vaporize it properly into gas, the liquefied gas sampling device according to the present invention also has some attached devices or components provided on the pipeline 1, such as including Figure 1 the first regulating valve 11, the second regulating valve 12, the temperature detection device 13, the pressure detection device 14, etc. shown as

[0026] The functions of the first and second regulating valves 11 and 12 are to regulate the flow rate of the fluid flowing through the pipeline 1. Herein, "fluid" generally refers to all media flowing in the pipeline 1, especially including the liquid introduced into the pipeline 1 from the liquefied gas source, and / or the gas vaporized from the liquid in the pipeline 1. The first and second regulating valves 11 and 12 can regulate the flow rate of the fluid by adjusting the flow area of the pipeline 1, and thus can also correspondingly regulate the fluid pressure in the pipeline 1, and thereby affect the transformation of the fluid from liquid state to gas state. In the flow direction of the fluid in the pipeline 1 ( Figure 1In the [direction from left to right in the figure], the first regulating valve 11 is arranged upstream of the second regulating valve 12. In this text, "upstream" and "downstream" are both defined with reference to the flow direction of the fluid in the pipeline 1. The first and second regulating valves 11, 12 can gradually regulate the flow rate or pressure of the fluid. Among them, the second regulating valve 12 may have a smaller flow regulation range and a higher flow regulation accuracy than the first regulating valve 11. Thus, the first regulating valve 11 performs a coarse adjustment. It is opened to a certain opening degree to control the flow rate of the fluid passing through it (usually all liquid) and preliminarily reduce the pressure of the liquid; the second regulating valve 12 realizes a fine adjustment or a micro-adjustment. It more precisely regulates the flow rate and pressure of the fluid passing through it (which may start to include a part of the gas vaporized from the liquid) so as to more accurately control the transformation of the liquid into the gas. Although a total of two regulating valves, the first and second regulating valves 11, 12, are provided in the illustrated embodiment, one regulating valve or more than two regulating valves can also be provided according to different requirements, as long as the flow rate of the fluid in the pipeline 1 can be regulated and thus the liquid / gas transformation of the fluid can be controlled.

[0027] To ensure the safe and stable transformation of the liquid from the liquefied gas source into a gas in the pipeline 1, a temperature detection device 13 (in the form of a temperature probe, for example) and a pressure detection device 14 (in the form of a pressure gauge, for example) are also provided downstream of the regulating valves (the first and second regulating valves 11, 12) for respectively detecting the temperature and pressure of the fluid in the pipeline 1. When operating the first regulating valve 11 and / or the second regulating valve 12 for flow regulation, the temperature detection device 13 and the pressure detection device 14 can monitor the changes in the temperature and pressure of the fluid in the pipeline 1 in real time. Based on this, the first regulating valve 11 and / or the second regulating valve 12 can be feedback-adjusted to keep the temperature and pressure of the fluid in the pipeline 1 within the desired preset range, thus ensuring the safety and reliability of subsequent sampling. In Figure 1 In the illustrated embodiment, the temperature detection device 13 is arranged upstream of the pressure detection device 14, but the present invention is not limited thereto, and the upstream and downstream positions of these two devices can also be interchanged.

[0028] As an optional additional safety measure, the liquefied gas sampling device according to the illustrated embodiment may further include a first safety relief valve 16 and / or a second safety relief valve 17 arranged on the pipeline 1. The first safety relief valve 16 is arranged upstream of the first and second regulating valves 11, 12 and is used to open for pressure relief when the pressure of the fluid at this place in the pipeline 1 (mainly the liquid introduced into the pipeline 1 from the liquefied gas source) exceeds the safety threshold, so as to prevent excessive fluid pressure from causing harm to the pipeline 1 and the surrounding personnel. The second safety relief valve 17 is arranged downstream of the first and second regulating valves 11, 12 and is also used to open for pressure relief when the pressure of the fluid at this place in the pipeline 1 (mainly the gas vaporized from the above-mentioned liquid) exceeds the safety threshold, so as to prevent excessive fluid pressure from causing harm to the pipeline 1 and the surrounding personnel.

[0029] In an optional embodiment, the temperature detection device 13 can be integrated with the second regulating valve 12 as shown in Figure 1 to form a "temperature measuring valve", and / or the pressure detection device 14 can be integrated with the second safety relief valve 17 as shown in Figure 1 to simplify the installation of the temperature detection device 13 and / or the pressure detection device 14. Additionally, optionally, a pressure detection device can also be provided for the first regulating valve 11 to monitor the fluid pressure at the first regulating valve 11 in real time, so as to better feedback and control the opening degree of the first regulating valve 11.

[0030] The liquefied gas sampling device according to the present utility model may also include, as shown in Figure 1 a concentration detection device 15 disposed on the pipeline 1 downstream of the temperature detection device 13 and the pressure detection device 14 (and the second safety relief valve 17). The concentration detection device 15 can be used to detect the concentration of the liquefied gas in the fluid within the pipeline 1. Before receiving the liquid from the liquefied gas source, the interior of the pipeline 1 may be filled with impurity gases (such as air or the gases remaining after the previous sampling work), and such impurity gases will cause compositional interference to the gas vaporized from the liquid (mainly the liquefied gas itself in gaseous state), making the sample extracted by the sample output device 2 impure subsequently. By providing the concentration detection device 15 on the pipeline 1 before the sample output device 2, the concentration of the liquefied gas in the pipeline 1 before the sample output device 2 can be monitored in real time. After the concentration of the liquefied gas rises to a stable level (indicating that the impurity gases in the pipeline 1 have been emptied by the introduced liquefied gas), then extract the sample from the sample output device 2, which can ensure the accuracy and reliability of sampling. Additionally, by comparing the stable level of the liquefied gas concentration measured by the concentration detection device 15 with a predetermined reference concentration, it is also possible to pre-judge whether the liquefied gas supplied from the liquefied gas source meets the concentration requirements before sampling.

[0031] The second end of the pipeline 1 ( Figure 1 the right end in Figure 1 the shown embodiment) serves as the outlet of the pipeline 1 and is connected to the sample output device 2. In the embodiment shown in Figure 1The lower end) communicates with the second end of the pipeline 1 so as to receive the fluid to be extracted from the pipeline 1, thereby forming the inlet 211 of the sample output device 2. The straight section 21 extends straight upward from the second end of the pipeline 1, for example, perpendicularly to the pipeline 1 for a certain distance (such as about 30 cm), and then starts to bend and enters the bent section 22. The place where it starts to bend is the starting end of the bent section 22. The straight section 21 extending vertically upward can make it difficult for the liquefied gas that has not vaporized into gas and is still in a liquid state in the pipeline 1 to rise through the straight section 21 under the action of gravity and finally leave the sample output device 2, reducing the risk of harm to the operator caused by the cryogenic liquefied gas. The bent section 22 extends in a bent manner (such as about 20 cm) and terminates at the end with an outlet 222, and this outlet 222 forms the sample outlet of the sample output device 2. The bending angle that the end of the bent section 22 turns relative to its starting end is at least 90 degrees, which makes the outlet 222 at the end of the bent section 22 at least face the horizontal direction or face downward, so that it is difficult for impurities such as rainwater and dust in the outside world to enter the outlet 222 to contaminate the sample. The outlet 222 can be connected to a sampling container (not shown) such as a sampling bottle or a sampling bag when the sampling conditions are met to extract the sample into the sampling container for further detection and analysis (such as analyzing the specific components of the sample). A sampling regulating valve 23 can also be provided on the above pipe fittings (the straight section 21 or the bent section 22) for regulating the sample output flow rate of the sample output device 2 as needed.

[0032] In another embodiment, a residual fluid discharge port 19 for discharging the residual fluid in the pipeline 1 can also be provided on the pipeline 1. The residual fluid discharge port 19 has a diameter of about 5 cm, for example, and can be provided, for example, between the second regulating valve 12 and the second safety relief valve 17, but can also be provided at other appropriate positions on the pipeline 1.

[0033] The working process of the liquefied gas sampling device according to the present invention will be briefly described below. First, the entire liquefied gas sampling device including the pipeline 1 and the sample output device 2 is fixed on a horizontal support surface (such as the ground) through the respective supports 18. Then, the residual fluid discharge port 19 is closed, and the pipeline 1 is connected to the liquefied gas source with a hose 3 and the outlet valve on the liquefied gas source is opened. Next, the first regulating valve 11 and the second regulating valve 12 are slowly opened, and at the same time, the temperature of the temperature detection device 13 and the pressure of the pressure detection device 14 are observed, and the opening degrees of the first and second regulating valves are adjusted to ensure that the observed temperature and pressure are both within the desired preset range. Then, the sampling regulating valve 23 on the sample output device 2 is slowly opened, and at the same time, the change in the concentration detected by the concentration detection device 15 is observed. When the concentration of the concentration detection device 15 reaches a certain stable level, a sampling container is connected to the outlet 222 of the sample output device 2 for sampling.

[0034] After the sampling is completed, first close the outlet valve on the liquefied gas source, then disconnect the connection between the liquefied gas source and the hose 3, then close the first and second regulating valves 11, 12 and the sampling regulating valve 23, and finally open the residual drain port 19 to discharge the residual fluid in the pipeline 1.

[0035] The liquefied gas sampling device according to the present utility model has a simple structure and is easy to operate. During sampling, it can accurately control the flow rate, temperature and pressure of the sample, and simultaneously measure the concentration of the liquefied gas. It also adopts multiple safety protection measures, improving the accuracy, safety, speed and reliability of sampling detection, ensuring the personal safety of the operator and the smooth and efficient progress of the sampling process. In particular, it brings a brand-new liquefied gas sampling experience to biopharmaceutical enterprises and meets the high-quality requirements of the biopharmaceutical industry for products.

[0036] For those skilled in the art, various modifications and variations can be made to the embodiments disclosed above without departing from the scope or spirit of the present utility model. Based on the practice of the present utility model disclosed in this specification, other embodiments of the present utility model will be obvious to those skilled in the art. This specification and the examples disclosed therein should be considered merely illustrative, and the true scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A liquefied gas sampling device, characterized in that Comprising: A pipeline (1) having a first end and a second end opposite to each other, the first end being configured to receive liquid from a liquefied gas source; A sample output device (2) connected to the second end of the pipeline (1) to receive, as a sample, the gas vaporized from the liquid in the pipeline and output the sample to a sampling container; At least one regulating valve (11, 12) arranged in sequence on the pipeline along the flow direction of the fluid in the pipeline (1) for regulating the flow rate of the fluid in the pipeline, and a concentration detection device (15) for detecting the concentration of liquefied gas in the fluid in the pipeline; and A temperature detection device (13) and a pressure detection device (14) arranged on the pipeline in the flow direction between the regulating valve (11, 12) and the concentration detection device (15) for detecting the temperature and pressure of the fluid in the pipeline respectively.

2. The liquefied gas sampling device according to claim 1, characterized in that The at least one regulating valve (11, 12) includes a first regulating valve (11) and a second regulating valve (12) arranged downstream of the first regulating valve in the flow direction, and the second regulating valve has a smaller flow regulation range and higher flow regulation accuracy than the first regulating valve.

3. The liquefied gas sampling device according to claim 2, characterized in that The temperature detection device (13) is integrally arranged with the second regulating valve (12).

4. The liquefied gas sampling device according to any one of claims 1 to 3, characterized in that It further includes a first safety relief valve (16) arranged on the pipeline (1) upstream of the at least one regulating valve (11, 12) in the flow direction, and / or a second safety relief valve (17) arranged on the pipeline between the at least one regulating valve (11, 12) and the concentration detection device (15) in the flow direction.

5. The liquefied gas sampling device according to claim 4, characterized in that The pressure detection device (14) is integrally arranged with the second safety relief valve (17).

6. The liquefied gas sampling device according to any one of claims 1 to 3, characterized in that The sample output device (2) includes a pipe fitting having a straight section (21) and a bent section (22) connected to each other, the straight section having an inlet (211) communicating with the second end of the pipeline (1) and extending upward from the second end, and the bent section being bent relative to the straight section by at least 90 degrees and having an outlet (222) serving as a sample output port.

7. The liquefied gas sampling device according to claim 6, characterized in that A sampling regulating valve (23) for regulating the sample output flow rate is arranged on the pipe fitting.

8. The liquefied gas sampling device according to any one of claims 1 to 3, characterized in that A residual fluid discharge port (19) for discharging the residual fluid in the pipeline is further arranged on the pipeline (1).

9. The liquefied gas sampling device according to any one of claims 1 to 3, characterized in that The pipeline (1) is a rigid straight pipe supported in a horizontal attitude by a support (18).

10. The liquefied gas sampling device according to any one of claims 1 to 3, characterized in that it further includes a hose (3) connecting the first end of the pipeline (1) to the liquefied gas source.

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