Cryogenic liquid sampling device

Abstract

The utility model provides a cryogenic liquid sampling device which comprises a sampling conduit, a diffusing conduit, a sampling bottle, a gasifier, a liquid level meter and an inert gas steel cylinder, one end of the sampling conduit is communicated with a cryogenic liquid pipeline, and the other end of the sampling conduit is connected with an inlet end of the sampling bottle; one end of the diffusing conduit is connected with the sampling conduit, and the other end is communicated with the cryogenic liquid diffusing pipe; two ends of the liquid level meter are connected with the outlet end of the sampling bottle and the diffusing conduit; two ends of the gasifier are communicated with two ends of the sampling bottle; and the inert gas steel cylinder is communicated with the sampling conduit. According to the embodiment, by arranging the inert gas steel cylinder, other gases can be replaced. And potential safety hazards caused by on-site diffusion can be avoided due to the arrangement of the diffusion guide pipe. And finally, the cryogenic liquid in the sampling bottle can be integrally gasified through the gasifier, so that homogeneous pressure stabilization of the sampled gas is realized, and compared with a gas-liquid mixed state, the sampling precision can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cryogenic liquid sampling, in particular to a cryogenic liquid sampling device. Background Art

[0002] In cryogenic process production such as natural gas LNG liquefaction plants, new energy hydrogen liquefaction plants, and other cryogenic production activities in the chemical industry, various cryogenic liquids need to be sampled regularly for gas quality testing to maintain and ensure normal production.

[0003] Taking LNG liquefaction plants as an example, when sampling LNG products, these cryogenic liquid substances are mixtures of different components, flash evaporation occurs, and the sampling process is not perfect, resulting in inaccurate sampling, sometimes the sample is in gaseous state, sometimes in gas-liquid mixed state;

[0004] In addition, when taking cryogenic liquid products, the inevitable heat exchange with the environment causes a lot of liquid to vaporize and be released on the spot, failing to form a closed and complete sampling process, posing a great safety hazard. Utility Model Content

[0005] The content of this disclosure is intended to briefly introduce concepts that will be described in detail in the detailed description of the embodiments below. The content of this disclosure is not intended to identify key features or essential features of the claimed technical solution, nor is it intended to limit the scope of the claimed technical solution.

[0006] The utility model provides a cryogenic liquid sampling device to solve the technical problems mentioned in the above background technology part.

[0007] The cryogenic liquid sampling device includes a sampling conduit, a discharge conduit, a sampling bottle, a vaporizer, a liquid level gauge, and an inert gas cylinder. One end of the sampling conduit is connected to the cryogenic liquid pipeline, and the other end is connected to the inlet end of the sampling bottle; one end of the discharge conduit is connected to the sampling conduit, and the other end is connected to the cryogenic liquid discharge pipe; both ends of the liquid level gauge are connected to the outlet end of the sampling bottle and the discharge conduit; both ends of the vaporizer are connected to both ends of the sampling bottle; and the inert gas cylinder is connected to the sampling conduit.

[0008] Optionally, a sampling valve and a first temperature sensor are provided on the sampling conduit.

[0009] Optionally, a relief valve is provided on the relief conduit.

[0010] Optionally, a gasifier inlet valve and a gasifier outlet valve are provided at both ends of the gasifier.

[0011] Optionally, a second temperature sensor is provided on the liquid level gauge.

[0012] Optionally, the inlet end and the outlet end of the liquid level meter are respectively provided with a liquid level meter inlet valve and a liquid level meter outlet valve.

[0013] Optionally, a sampling bottle inlet valve is provided at the inlet end of the sampling bottle, and the sampling bottle inlet valve is connected to a first connecting hose, which is also detachably connected to the vaporizer outlet valve and the sampling conduit.

[0014] Optionally, a sampling bottle outlet valve is further provided at the outlet end of the sampling bottle, and the sampling bottle outlet valve is connected to a second connecting hose, and the second connecting hose is also detachably connected to the vaporizer inlet valve and the liquid level meter inlet valve.

[0015] Optionally, the outlet end of the inert gas cylinder is connected to the sampling sleeve through a conduit.

[0016] Optionally, the sampling sleeve is further provided with a first valve and a second valve, and the first valve and the second valve are provided at both ends of the connection between the catheter and the sampling sleeve.

[0017] The above-described embodiment of the present invention has the following beneficial effects: First, by providing an inert gas cylinder, other gases in the sampling conduit, venting conduit, sampling bottle, vaporizer, and liquid level gauge can be replaced with an inert gas that does not interfere with the gas to be sampled before sampling. This ensures that the sampled gas is not contaminated with the aforementioned other gases during sampling, thereby improving the reliability and accuracy of sampling.

[0018] Furthermore, at the beginning of sampling, the cryogenic liquid will vaporize. The provision of a discharge conduit allows the vaporized portion to be discharged through the cryogenic liquid discharge pipe first, avoiding the safety hazards caused by on-site release and the problem of inaccurate sampling due to flash evaporation of the cryogenic liquid. This further improves the reliability and safety of the sampling device.

[0019] Finally, the cryogenic liquid in the sampling bottle can be vaporized as a whole by the above-mentioned vaporizer, so as to achieve homogeneous and stable pressure of the sampling gas, which can improve the sampling accuracy compared with the gas-liquid mixed state. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1Schematic diagram of the structure of some embodiments of a cryogenic liquid sampling device of the present invention.

[0022] Description of reference numerals:

[0023] 1: Liquefied natural gas pipeline; 2: Liquefied natural gas release pipe;

[0024] 31: sampling conduit; 32: sampling valve; 33: first temperature sensor; 34: first valve; 35: second valve;

[0025] 41: Release catheter; 42: Release valve;

[0026] 51: sampling bottle; 52: sampling bottle inlet valve; 53: sampling bottle outlet valve; 54: pressure sensor; 55: first connecting hose; 56: second connecting hose;

[0027] 61: Vaporizer; 62: Vaporizer inlet valve; 63: Vaporizer outlet valve;

[0028] 71: Liquid level gauge; 72: Liquid level gauge inlet valve; 73: Liquid level gauge outlet valve; 74: Second temperature sensor;

[0029] 81: Inert gas cylinder; 82: Conduit; 83: Inert gas cylinder outlet valve; 84: Inert gas stop valve. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0033] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0034] See also Figure 1 , Figure 1 This is a schematic diagram of the structure of some embodiments of a cryogenic liquid sampling device of the present invention. Figure 1 As shown, the cryogenic liquid sampling device includes a sampling conduit 31, a release conduit 41, a sampling bottle 51, a vaporizer 61, a liquid level gauge 71, and an inert gas cylinder 81. This sampling device can be used to sample a variety of cryogenic liquids, such as liquefied natural gas (LNG) and liquefied hydrogen. The following describes the sampling device using LNG as an example.

[0035] In some embodiments, one end of the sampling conduit 31 is connected to a cryogenic liquid pipeline. Specifically, the cryogenic liquid pipeline can be a liquefied natural gas pipeline 1 in this embodiment. The other end of the sampling conduit 31 is connected to the inlet end of the sampling bottle 51 ( Figure 1 Specifically, the sampling conduit 31 may be connected to the liquefied natural gas pipeline via a thread or a flange.

[0036] A sampling valve 32 may be provided on the sampling conduit 31 . The opening and closing of the sampling valve 32 can open and block the liquefied natural gas flowing into the liquefied natural gas pipeline 1 .

[0037] Continue reading Figure 1 One end of the above-mentioned venting conduit 41 is connected to the outlet end of the sampling valve 32 ( Figure 1 The other end of the discharge conduit 41 is connected to the cryogenic liquid discharge pipe. In this embodiment, the cryogenic liquid discharge pipe can be a liquefied natural gas discharge pipe 2.

[0038] A discharge valve 42 is also provided on the discharge conduit 41. Furthermore, a first temperature sensor 33 is also provided on the sampling conduit 31. A sampling bottle inlet valve 52 and a sampling bottle outlet valve 53 are provided at the inlet and outlet ends of the sampling bottle 51, respectively.

[0039] During sampling, the sampling bottle inlet valve 52 is first closed, and the sampling valve 32 and the vent valve 42 are opened, allowing the vaporized liquefied natural gas entering through the sampling conduit 31 into the vent conduit 41 and then discharged from the liquefied natural gas vent pipe 2. This continues until the temperature collected by the first temperature sensor 33 falls below a preset threshold, indicating that the vaporized portion of the incoming liquefied natural gas has been discharged. At this point, the vent valve 42 is closed, and the sampling bottle inlet valve 52 and the sampling bottle outlet valve 53 are opened, allowing the liquefied natural gas to enter. In this way, the vaporized portion can be discharged from the liquefied natural gas vent pipe 2 first, avoiding safety hazards caused by on-site venting and inaccurate sampling caused by flash evaporation of liquefied natural gas. This thereby improves the reliability and safety of the sampling device.

[0040] It should be noted that the above-mentioned preset threshold value can be determined by those skilled in the art according to actual conditions. Taking liquefied natural gas as an example, the above-mentioned preset threshold value can be -160°C.

[0041] Continue reading Figure 1 , the lower end of the liquid level gauge 71 ( Figure 1 The upper end of the liquid level meter 71 ( Figure 1 The liquid level gauge 71 is connected to the vent conduit 41 (in the direction of the center). Furthermore, the inlet and outlet ends of the liquid level gauge 71 are respectively provided with a liquid level gauge inlet valve 72 and a liquid level gauge outlet valve 73. During sampling, the sampling bottle inlet valve 52, the sampling bottle outlet valve 53, the liquid level gauge inlet valve 72, and the liquid level gauge outlet valve 73 are open. As liquefied natural gas continues to enter the sampling bottle 51, the inert gas in the sampling bottle 51 that does not interfere with the liquefied natural gas enters the vent conduit 41 through the liquid level gauge 71 and is then discharged.

[0042] Furthermore, the liquid level gauge is also equipped with a second temperature sensor 74 for detecting the temperature of the liquid level gauge 71. When the temperature sensed by the second temperature sensor 74 is higher than a preset threshold, it indicates that the medium flowing into the liquid level gauge 71 is the inert gas in the sampling bottle 51. When the temperature sensed by the second temperature sensor 74 is lower than the preset threshold, it indicates that the medium flowing into the liquid level gauge 71 is liquefied natural gas.

[0043] Next, check the value of the liquid level gauge 71. When the liquid level gauge 71 shows that the liquid level has reached the high level, it indicates that the sampling bottle 51 is full of liquefied natural gas. At this time, close the sampling valve 32, the sampling bottle inlet valve 52, and the sampling bottle outlet valve 53.

[0044] The two ends of the vaporizer 61 are connected to the two ends of the sampling bottle 51. Specifically, the gas outlet and gas inlet ends of the vaporizer 61 are respectively provided with a vaporizer inlet valve 62 and a vaporizer outlet valve 63. The vaporizer inlet valve 62 is connected to the sampling bottle outlet valve 53. The vaporizer outlet valve 63 is connected to the sampling bottle inlet valve 52. Specifically, the vaporizer inlet valve 62 is connected to the inlet end of the liquid level gauge inlet valve 72. When the sampling bottle 51 is full, the vaporizer inlet valve 62, the vaporizer outlet valve 63, the sampling bottle inlet valve 52 and the sampling bottle outlet valve 53 are opened to allow liquefied natural gas to enter the vaporizer 61 for heat exchange. Finally, the gaseous natural gas is stored in the sampling bottle 51. In this way, the homogeneous pressure stabilization of the sampled gas is achieved, which can improve the sampling accuracy compared to the gas-liquid mixture. Furthermore, a pressure sensor 54 may be provided at the outlet end of the sampling bottle 51 to detect the pressure value in the sampling bottle 51 .

[0045] To facilitate removal of the sampling bottle 51, the sampling bottle inlet valve 52 can be connected to a first connecting hose 55, which can also be detachably connected to the sampling conduit 31 and the outlet end of the vaporizer outlet valve 63. The sampling bottle outlet valve 53 can be connected to a second connecting hose 56, which can also be detachably connected to the inlet ends of the vaporizer inlet valve 62 and the liquid level gauge inlet valve 72. Thus, when removing the sampling bottle 51, the sampling bottle inlet valve 52, the sampling bottle outlet valve 53, the liquid level gauge inlet valve 72, the vaporizer inlet valve 62, and the vaporizer outlet valve 63 can be closed, and the first connecting hose 55 and the second connecting hose 56 can be removed, thereby improving the convenience of removing the sampling bottle 51.

[0046] The inert gas cylinder 81 is connected to the sampling conduit 31. Specifically, the inert gas cylinder 81 is provided with an inert gas cylinder outlet valve 83 at its mouth. The inert gas cylinder 81 can be connected to the sampling conduit 31 via a conduit 82. An inert gas shut-off valve 84 can be provided at one end of the conduit 82 near the sampling conduit 31. A first valve 34 and a second valve 35 can be provided on either side of the connection between the conduit 82 and the sampling conduit 31. During sampling, the first valve 34 and the second valve 35 are opened, and the inert gas cylinder outlet valve 83 is closed. Before sampling, the inert gas cylinder outlet valve 83, the inert gas shut-off valve 84, the first valve 34, and the second valve 35 can be opened, and the sampling valve 32 can be closed, so that the inert gas replaces other gases in the sampling conduit 31, the venting conduit 41, the sampling bottle 51, the vaporizer 61, and the liquid level gauge 71. This ensures that the sampled gas will not be mixed with the other gases mentioned above during sampling, thereby improving the reliability and accuracy of the sampling.

[0047] It should be noted that those skilled in the art can determine the selection of the above-mentioned sampling bottle based on actual conditions or products already on the market. Preferably, the above-mentioned sampling bottle 51 can adopt the sampler introduced in the utility model patent entitled "Inner and outer double shell intelligent wireless remote pressure monitoring industrial deep cold gas and liquid sampler" with the publication number "CN217084350U" authorized by the applicant. It can ensure the safety of long-term storage and long-distance transportation of high-pressure samples, and timely monitor the working status of the sampler to ensure the normal progress of production activities. It can also track the pressure in real time when it is abnormal, to prevent the inability to determine the location of the gas leak after the gas leak, thereby polluting the environment.

[0048] Finally, each of the aforementioned valves can be either manual or electric. Specifically, the sampling device can also include a controller that is communicatively connected to each of the aforementioned valves, each temperature sensor, pressure sensor, liquid level gauge, and vaporizer. This further enhances the automation level of the sampling device. For example, the controller can be a PLC (Programmable Logic Controller) or an MCU (Microcontroller Unit). Those skilled in the art can select the appropriate controller based on practical needs.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cryogenic liquid sampling device, characterized in that: It includes sampling tube, emission tube, sampling bottle, vaporizer, liquid level gauge and inert gas cylinder, among which, One end of the sampling conduit is connected to the cryogenic liquid pipeline, and the other end is connected to the inlet end of the sampling bottle; One end of the discharge conduit is connected to the sampling conduit, and the other end is connected to the cryogenic liquid discharge pipe; Both ends of the liquid level meter are connected to the outlet end of the sampling bottle and the emission conduit; The two ends of the vaporizer are connected to the two ends of the sampling bottle; The inert gas cylinder is communicated with the sampling conduit.

2. A cryogenic liquid sampling device according to claim 1, characterized in that: The sampling conduit is provided with a sampling valve and a first temperature sensor.

3. A cryogenic liquid sampling device according to claim 2, characterized in that: The release conduit is provided with a release valve.

4. A cryogenic liquid sampling device according to claim 3, characterized in that: A gasifier inlet valve and a gasifier outlet valve are provided at both ends of the gasifier.

5. The cryogenic liquid sampling device according to claim 4, characterized in that: The liquid level gauge is provided with a second temperature sensor.

6. The cryogenic liquid sampling device according to claim 5, characterized in that: The inlet end and the outlet end of the liquid level meter are respectively provided with a liquid level meter inlet valve and a liquid level meter outlet valve.

7. A cryogenic liquid sampling device according to claim 6, characterized in that: The inlet end of the sampling bottle is provided with a sampling bottle inlet valve, and the sampling bottle inlet valve is connected to a first connecting hose, and the first connecting hose is also detachably connected to the vaporizer outlet valve and the sampling conduit.

8. The cryogenic liquid sampling device according to claim 7, characterized in that: The outlet end of the sampling bottle is further provided with a sampling bottle outlet valve, the sampling bottle outlet valve is connected to a second connecting hose, and the second connecting hose is also detachably connected to the vaporizer inlet valve and the liquid level meter inlet valve.

9. The cryogenic liquid sampling device according to claim 1, characterized in that: The outlet end of the inert gas cylinder is connected to the sampling sleeve through a conduit.

10. The cryogenic liquid sampling device according to claim 9, characterized in that: The sampling sleeve is further provided with a first valve and a second valve, which are arranged at both ends of the connection between the catheter and the sampling sleeve.

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