Sample introduction vaporization probe for low-temperature liquid

Abstract

The utility model provides a sample introduction vaporization probe for low-temperature liquid, which is characterized in that a liquid homeopathic vaporization assembly is arranged in a protective box body, and one end of a low-temperature liquid transmission assembly is connected to the inlet end of the liquid homeopathic vaporization assembly through a first flange; and the other end of the low-temperature liquid transmission assembly is connected to the outlet end of the probe assembly through a KF flange. According to the sample introduction vaporization probe for the low-temperature liquid, the two-way liquid inlet channel is arranged at the inlet end of the probe, the liquid inlet end of the probe has two liquid inlet directions of a forward medium flow direction a and a reverse medium flow direction b, the probe is suitable for one-way liquid inlet of a liquid probe of a liquid main pipeline, and the probe sample introduction pipe is installed at the outlet end of the probe. The directional shifting piece is installed at the inlet end of the probe sample injection pipe, is used for selectively opening or closing one liquid inlet of the two-way liquid inlet channel, and can control liquid to enter a subsequent pipeline of the probe only in the corresponding direction, so that the liquid is prevented from flowing back.

Description

Technical Field

[0001] This invention belongs to the field of cryogenic liquid sampling, and in particular relates to a vaporization probe for cryogenic liquids. Background Technology

[0002] With the advancement of industrial development, cryogenic engineering is a major trend in modern development, exemplified by the industrialization of cryogenic media such as liquid oxygen, LNG, liquid nitrogen, liquid helium, and liquid ammonia. The formation of this industry necessitates strict quality control methods to ensure product quality. However, sample collection remains a significant challenge both domestically and internationally, as it's impossible to directly obtain cryogenic liquid media for vaporization analysis. For instance, current technology for collecting natural gas at ports involves centralized sampling, followed by extraction and release of the sample gas according to different testing requirements. When sampling from different transport vessels or tanks, the pressure of liquefied natural gas within the different carriers varies, resulting in differences in the pressure and temperature of the released medium. Therefore, during sample testing, the sample temperature and pressure need to be adjusted to set values ​​to ensure stable test quality. Utility Model Content

[0003] In view of this, the present invention aims to propose a vaporization probe for cryogenic liquids to solve the problem of low sampling efficiency caused by different sampling medium pressures and temperatures for different samples in the prior art.

[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0005] A sample vaporization probe for cryogenic liquids includes a probe, a cryogenic liquid transport assembly, and a liquid homeostatic vaporization assembly. The probe is connected to the liquid homeostatic vaporization assembly via the liquid transport assembly. The liquid homeostatic vaporization assembly is installed inside a protective enclosure. One end of the cryogenic liquid transport assembly is connected to the inlet end of the liquid homeostatic vaporization assembly via a first flange, and the other end of the cryogenic liquid transport assembly is connected to the outlet end of the probe assembly via a KF flange. The inlet end of the probe is inserted into a delivery pipe, and the inlet end of the probe is provided with a bidirectional liquid inlet channel, wherein the two liquid inlet channels of the bidirectional liquid inlet channel are not interconnected.

[0006] Furthermore, a probe inlet tube is installed at the outlet end of the probe, and one end of the probe inlet tube is connected to the cryogenic liquid transfer assembly. A directional lever is installed at the inlet end of the probe inlet tube, allowing the liquid medium in the delivery pipe to flow into two liquid inlet channels. The directional lever is used to selectively open one of the two liquid inlet channels of the bidirectional liquid inlet channel.

[0007] Furthermore, the cryogenic liquid transfer assembly includes a process hose, and a cryogenic pneumatic valve is installed on the process hose. The process hose is covered with a sheathed hose and a vacuum sheathed tube, respectively. The sheathed hose is installed at one end of the vacuum sheathed tube and connected to one end of the probe. A first flange is installed at the other end of the vacuum sheathed tube.

[0008] Furthermore, a valve vacuum sleeve is provided around the cryogenic pneumatic valve, and the valve vacuum sleeve is connected to the vacuum sleeve tube.

[0009] Furthermore, the vacuum sheath tube and the valve vacuum sheath are respectively provided with vacuum chambers, and the outlet end of the vacuum chamber is equipped with a sealing plug.

[0010] Furthermore, the sheathed hose is a corrugated pipe.

[0011] Furthermore, a cryogenic check component is provided between the cryogenic liquid transfer component and the liquid vaporization component, and one end of the cryogenic check component is connected to the cryogenic liquid transfer component through a first flange, and the other end of the cryogenic check component is connected to the liquid vaporization component through a connecting flange. A temperature and pressure sensor is provided at the inlet end of the cryogenic check component, and the cryogenic check component is located inside the protective enclosure.

[0012] Furthermore, the liquid homeostatic vaporization assembly includes a first vaporization device and a second vaporization device. The first vaporization device and the second vaporization device each include a vaporization pipe. An electric heater and a first temperature sensor are respectively installed around the vaporization pipe. The vaporization pipe is arranged in a labyrinthine pattern. A support body with a honeycomb structure is installed around the vaporization pipe. The two ends of the vaporization pipe of the first vaporization device are respectively connected to one end of the vaporization pipe of the low-temperature liquid transfer assembly and the second vaporization device. A vaporization expansion tank is installed at the other end of the vaporization pipe of the second vaporization device. An outlet pipe is installed at the outlet end of the vaporization expansion tank. A pressure switch, a second temperature sensor, and a pressure sensor are respectively installed on the outlet pipe along the medium flow direction.

[0013] Furthermore, the first vaporization device and the second vaporization device are respectively installed inside the explosion-proof enclosure, and the outer periphery of the gas outlet pipe is connected to the explosion-proof enclosure through an explosion-proof through-plate assembly.

[0014] Furthermore, the liquid homeostatic vaporization component also includes a control box and a gas leak sensor, which are respectively installed inside the protective enclosure and located outside the explosion-proof housing. A power data interface component is provided on the protective enclosure, and the explosion-proof cable inside the explosion-proof housing is connected in series to the external signal line through the power data interface component.

[0015] Compared with the prior art, the sample vaporization probe for cryogenic liquids described in this utility model has the following beneficial effects: the inlet end of the probe is provided with a bidirectional liquid inlet channel, the two liquid inlet channels of the bidirectional liquid inlet channel are not connected to each other, the liquid inlet end of the probe has two liquid inlet directions: forward medium flow direction a and reverse medium flow direction b, which is suitable for unidirectional liquid inlet of liquid main pipeline liquid probe, the outlet end of the probe is equipped with a probe injection tube, and the inlet end of the probe injection tube is equipped with a directional lever, which is used to select to open or close one inlet of the bidirectional liquid inlet channel. The directional lever can control the liquid to enter the subsequent pipeline of the probe only through the corresponding direction, and prevent the liquid from flowing back. Attached Figure Description

[0016] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0017] Figure 1 This is a schematic diagram of the structure of the sample vaporization probe for cryogenic liquids described in an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of the protective box containing the liquid homeostatic vaporization component as described in this embodiment of the utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the probe and cryogenic liquid transport assembly as described in an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1-Probe; 11-Bidirectional liquid inlet channel; 12-Probe sample inlet tube; 13-Directional lever; 2-Cryogenic liquid transfer assembly; 21-Process hose; 22-Cryogenic pneumatic valve; 23-Sheathed hose; 24-Vacuum sheath tube; 25-Valve vacuum sheath tube; 26-Vacuum chamber; 27-Sealing plug; 3-Liquid vaporization assembly; 31-Cryogenic check valve assembly; 32-Vaporization pipeline; 33-Support body; 34-Electric heater; 35-Vaporization expansion tank; 36-Outlet pipe; 37-Pressure switch; 38-Explosion-proof through-plate assembly; 39-Explosion-proof housing; 310-Control box; 311-Gas leak sensor; 312-Explosion-proof cable; 4-Protective enclosure; 41-Power and data interface assembly; 5-First flange; 6-KF flange; 7-Transfer pipeline. Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0023] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] like Figures 1-3As shown, a sample vaporization probe for cryogenic liquids includes a probe 1, a cryogenic liquid transfer assembly 2, and a liquid homeostatic vaporization assembly 3. The probe 1 is connected to the liquid homeostatic vaporization assembly 3 via the liquid transfer assembly. The liquid homeostatic vaporization assembly 3 is installed inside a protective enclosure 4. One end of the cryogenic liquid transfer assembly is connected to the inlet of the liquid homeostatic vaporization assembly 3 via a first flange 5, and the other end is connected to the outlet of the probe 1 assembly via a KF flange 6. The inlet of the probe 1 is inserted into a delivery pipe 7, with the inlet inserted to one-third to one-half of the length of the pipe. A bidirectional liquid inlet channel 11 is provided at the inlet of the probe 1. The two liquid inlet channels of probe 1 are not connected to each other. The liquid inlet end of probe 1 has two liquid inlet directions: forward medium flow direction a and reverse medium flow direction b. It is suitable for unidirectional liquid inlet of liquid probe 1 in the main liquid pipeline. The probe inlet tube 12 is installed at the outlet end of probe 1, and one end of the probe inlet tube 12 is connected to the cryogenic liquid transfer assembly 2. The inlet end of the probe inlet tube 12 is equipped with a directional lever 13. The liquid medium in the delivery pipeline 7 can flow into the two liquid inlet channels. The directional lever 13 is used to select one of the two liquid inlet channels of the bidirectional liquid inlet channel 11 to ensure the unidirectionality of liquid flow into the probe flow path. The directional lever 13 can control the liquid to enter the subsequent pipeline of the probe only through the corresponding direction to prevent liquid backflow.

[0027] The cryogenic liquid transfer assembly 2 includes a process hose 21, and a cryogenic pneumatic valve 22 is provided on the process hose 21. The process hose 21 is covered with a sheathed hose 23 and a vacuum sheathed tube 24. The sheathed hose 23 is installed at one end of the vacuum sheathed tube 24 and is connected to one end of the probe 1. The first flange 5 is installed at the other end of the vacuum sheathed tube 24.

[0028] The low-temperature pneumatic valve 22 is surrounded by a valve vacuum sleeve, which is connected to a vacuum sleeve tube 24. Vacuum chambers 26 are provided on both the vacuum sleeve tube 24 and the valve vacuum sleeve. A sealing plug 27 is installed at the outlet end of the vacuum chamber 26. The sleeve hose 23 is a corrugated pipe. During use, the vacuum chamber 26 is evacuated to provide vacuum insulation and ensure the normal and stable operation of the low-temperature shut-off valve.

[0029] A cryogenic check valve 31 is provided between the cryogenic liquid transfer assembly 2 and the liquid vaporization assembly 3. One end of the cryogenic check valve 31 is connected to the cryogenic liquid transfer assembly 2 through the first flange 5, and the other end of the cryogenic check valve 31 is connected to the liquid vaporization assembly 3 through the connecting flange. A temperature and pressure sensor is provided at the inlet end of the cryogenic check valve 31, and the cryogenic check valve 31 is located inside the protective enclosure 4.

[0030] The liquid vaporization assembly 3 includes a first vaporization device and a second vaporization device. Each device includes a vaporization pipe 32. An electric heater 34 and a first temperature sensor are respectively installed around the vaporization pipe 32. The vaporization pipe 32 guides the flow of the medium. The electric heater 34 does not contact the medium to be vaporized, eliminating the risk of combustion or explosion during the heating process. The vaporization pipe 32 is arranged in a labyrinthine pattern. A support body 33 with a honeycomb structure is installed around the vaporization pipe 32. Both ends of the vaporization pipe 32 of the first vaporization device are connected to one end of the low-temperature liquid transfer assembly 2 and the vaporization pipe 32 of the second vaporization device, respectively. A vaporization expansion tank 35 is installed at the other end of the vaporization pipe 32 of the second vaporization device. An outlet pipe 36 is installed at the outlet end, and a pressure switch 37, a second temperature sensor, and a pressure sensor are respectively installed on the outlet pipe 36 along the medium flow direction. The first vaporization device is for instantaneous vaporization of the liquid in the early stage of flow, which is not complete vaporization and has the phenomenon of separation of light and heavy components. When the liquid flows into the second vaporization device again, instantaneous complete vaporization can be completed. The power of the first vaporization device is 500W (1000W, the specific heating power depends on the temperature and boiling point of the medium in the liquid state). The power of the second vaporization device is the same as that of the first vaporization device, but it has an instantaneous complete vaporization expansion volume box, which can stably buffer the gas pressure of instantaneous vaporization. The rear end of the vaporization expansion volume box is designed with a pressure switch 37, and a complete vaporization critical pressure switch 37 is designed, which can be used to determine the standard of complete vaporization of the liquid medium.

[0031] The first and second vaporization devices are cylindrical in shape with a diameter of 70mm and a height of 200mm. The first vaporization device has temperature and pressure sensors at its front end to detect and upload the temperature and pressure parameters of the liquid medium to the control system. The second vaporization device has a temperature sensor to monitor the temperature changes of the liquid medium during the instantaneous vaporization process in real time. The first vaporization device has a pressure switch 37 downstream of its pressure switch 37, which in turn has temperature and pressure sensors to collect temperature and pressure data for the fully vaporized gas medium. The vaporization expansion tank uses a 25.12mm diameter channel with a 200mm distance between the two ends of the diameter change, converting the 25.12mm diameter to 6.35mm. Alternatively, the diameter can be changed to the actual pipe diameter used by the medium. Figure 2 As shown, the first vaporization device and the second vaporization device are respectively installed inside the explosion-proof enclosure 39, and the outer periphery of the gas outlet pipe 36 is connected to the explosion-proof enclosure 39 through the explosion-proof through-plate assembly 38.

[0032] The liquid vaporization assembly 3 also includes a control box 310 and a gas leak sensor 311. The control box 310 and the gas leak sensor 311 are respectively installed inside the protective enclosure 4 and located outside the explosion-proof housing 39. A power data interface assembly 41 is provided on the protective enclosure 4. The explosion-proof cable 312 inside the explosion-proof housing 39 is connected in series to the external signal line through the power data interface assembly 41.

[0033] In this embodiment, the temperature sensor, pressure sensor, electric heating assembly, valves, and other electrical components are all existing technologies. The temperature sensor has a temperature measurement range of -200 to 100°C, a design range of -200 to 100°C, and an accuracy of ±1°C. The pressure sensor has a pressure monitoring range of 0 to 8 MPa, a design range of 0 to 10 MPa, and an accuracy of 1%. The electric heater 34 has a heating temperature range of 0 to 300°C, and a temperature control range of 0 to 300°C, selectable within this range. It has a power of 500W and a power supply of 24VDC. The preheating time at 80°C is 15 minutes. The support body 33 is made of polyurethane.

[0034] like Figure 3 As shown, the liquid flow direction is as follows: the liquid is introduced through the probe 1 inlet a / b (only one can be used, depending on the actual liquid flow direction of the main pipeline). The liquid medium enters the probe inlet tube 12 through the liquid directional deflector 13, and the liquid is introduced through the probe process hose 21, the low temperature resistant pneumatic valve 22, the temperature and pressure sensor, and the low temperature resistant high pressure check structure into the vaporization pipeline 32 and then into the vaporization expansion tank. Finally, it is delivered to the gas outlet through the pressure switch 37.

[0035] The probe is constructed entirely of 416L SS stainless steel. The first and second vaporization devices are encased in a metal shell, which is made of aluminum / copper. Aluminum has a thermal conductivity of approximately 217 W / mK, while copper has a thermal conductivity of 398 W / mK. The choice of material depends on the actual liquid temperature and boiling point of the medium. For example, aluminum shells are sufficient for heat conduction in LNG and liquid nitrogen, while copper shells are more suitable for heat conduction in liquid hydrogen and liquid ammonia. In this embodiment, the liquid medium is LNG, with a pre-vaporization temperature of -176℃ and a post-vaporization temperature of 15–50℃.

[0036] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A sample introduction vaporization probe for cryogenic liquids characterized by: The device includes a probe (1), a cryogenic liquid transfer assembly (2), and a liquid homeostatic vaporization assembly (3). The probe (1) is connected to the liquid homeostatic vaporization assembly (3) through the liquid transfer assembly. The liquid homeostatic vaporization assembly (3) is installed in a protective enclosure (4). One end of the cryogenic liquid transfer assembly is connected to the inlet end of the liquid homeostatic vaporization assembly (3) through a first flange (5). The other end of the cryogenic liquid transfer assembly is connected to the outlet end of the probe (1) assembly through a KF flange (6). The inlet end of the probe (1) is inserted into a delivery pipe (7). The inlet end of the probe (1) is provided with a bidirectional liquid inlet channel (11). The two liquid inlet channels of the bidirectional liquid inlet channel (11) are not connected to each other.

2. The sample introduction vaporization probe for cryogenic liquids of claim 1, wherein: The probe (1) is equipped with a probe inlet tube (12) at the outlet end, and one end of the probe inlet tube (12) is connected to the cryogenic liquid transfer assembly (2). The probe inlet tube (12) is equipped with a directional lever (13) at the inlet end, and the liquid medium in the delivery pipe (7) can flow into two liquid inlet channels. The directional lever (13) is used to select one of the two liquid inlet channels of the bidirectional liquid inlet channel (11).

3. The sample introduction vaporization probe for cryogenic liquids of claim 1, wherein: The cryogenic liquid transfer assembly (2) includes a process hose (21) and a cryogenic pneumatic valve (22) is provided on the process hose (21). The process hose (21) is covered with a sheathed hose (23) and a vacuum sheathed tube (24). The sheathed hose (23) is installed at one end of the vacuum sheathed tube (24). The sheathed hose (23) is connected to one end of the probe (1). The first flange (5) is installed at the other end of the vacuum sheathed tube (24).

4. The sample introduction vaporization probe for cryogenic liquids of claim 3, wherein: A valve vacuum sleeve is provided around the low-temperature resistant pneumatic valve (22), and the valve vacuum sleeve is connected to the vacuum sleeve tube (24).

5. The sample introduction vaporization probe for cryogenic liquids of claim 4, wherein: Vacuum chambers (26) are provided on the vacuum sleeve tube (24) and the valve vacuum sleeve respectively, and a sealing plug (27) is installed at the outlet end of the vacuum chamber (26).

6. The sample introduction vaporization probe for cryogenic liquids of claim 3, wherein: The sheathed hose (23) is a corrugated pipe.

7. The sample introduction vaporization probe for cryogenic liquids of claim 1, wherein: A cryogenic check assembly (31) is provided between the cryogenic liquid transfer assembly (2) and the liquid vaporization assembly (3). One end of the cryogenic check assembly (31) is connected to the cryogenic liquid transfer assembly (2) through the first flange (5), and the other end of the cryogenic check assembly (31) is connected to the liquid vaporization assembly (3) through the connecting flange. A temperature and pressure sensor is provided at the inlet end of the cryogenic check assembly (31), and the cryogenic check assembly (31) is located inside the protective enclosure (4).

8. The sample introduction vaporization probe for cryogenic liquids of claim 7, wherein: The liquid vaporization assembly (3) includes a first vaporization device and a second vaporization device. The first vaporization device and the second vaporization device each include a vaporization pipe (32). An electric heater (34) and a first temperature sensor are respectively installed around the vaporization pipe (32). The vaporization pipe (32) is arranged in a labyrinthine manner. A support body (33) is installed around the vaporization pipe (32). The support body (33) has a honeycomb structure. The two ends of the vaporization pipe (32) of the first vaporization device are respectively connected to one end of the low-temperature liquid transfer assembly (2) and the vaporization pipe (32) of the second vaporization device. A vaporization expansion tank (35) is installed at the other end of the vaporization pipe (32) of the second vaporization device. An outlet pipe (36) is installed at the outlet end of the vaporization expansion tank (35). A pressure switch (37), a second temperature sensor and a pressure sensor are respectively installed on the outlet pipe (36) along the medium flow direction.

9. The sample vaporization probe for cryogenic liquids according to claim 8, characterized in that: The first vaporization device and the second vaporization device are respectively installed inside the explosion-proof enclosure (39), and the outer periphery of the gas outlet pipe (36) is connected to the explosion-proof enclosure (39) through the explosion-proof through-plate assembly (38).

10. The sample introduction vaporization probe for cryogenic liquids of claim 8, wherein: The liquid vaporization assembly (3) also includes a control box (310) and a gas leak sensor (311), and the control box (310) and the gas leak sensor (311) are respectively installed in the protective enclosure (4) and located outside the explosion-proof housing (39). A power data interface assembly (41) is provided on the protective enclosure (4), and the explosion-proof cable (312) inside the explosion-proof housing (39) is connected in series to the external signal line through the power data interface assembly (41).

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