Low-temperature liquid vaporization sampling analysis system

Abstract

The utility model provides a low-temperature liquid vaporization sampling analysis system which comprises a vaporization input unit, an automatic analysis unit, a manual sampling unit, an automatic sampling unit, an analyzer and a sampling bottle, wherein the automatic analysis unit, the manual sampling unit and the automatic sampling unit are connected in parallel with the output end of the vaporization input unit; the input end of the vaporization input unit is connected with a low-temperature liquid medium, vaporizes low-temperature liquid and controls pressure to be output to the automatic analysis unit, the manual sampling unit and the automatic sampling unit; the automatic analysis unit monitors the pressure and temperature of the input medium and transmits the medium subjected to thermal compensation and pressure correction to the analyzer for analysis; the manual sampling unit manually controls pressure and deposits an input medium in a sampling bottle; the automatic sampling unit is used for automatically sampling a medium according to preset sampling parameters, so that high-purity and pressure-adjustable automatic sampling is realized. The device solves the problems of low efficiency, poor precision and insufficient safety of the existing low-temperature liquid analysis and sampling means.

Description

Technical Field

[0001] This invention belongs to the field of cryogenic liquid sampling and analysis technology, and in particular relates to a cryogenic liquid vaporization sampling and analysis system. Background Technology

[0002] The purity and quality analysis of cryogenic liquids (such as LNG, liquid nitrogen, liquid ammonia, and liquid helium) is crucial in industrial gas production and trade, directly affecting product quality and trade trust. Existing cryogenic liquid analysis methods mainly rely on manual sampling and offline laboratory testing, which have limitations such as low sampling efficiency, insufficient sample representativeness, and long testing cycles. At the same time, traditional vaporization devices are difficult to adapt to the instantaneous vaporization requirements at extremely low temperatures (such as -200℃) and lack automated control and real-time monitoring functions, making it difficult to guarantee analytical accuracy and safety.

[0003] Practical content

[0004] In view of this, the present invention aims to propose a cryogenic liquid vaporization sampling and analysis system to solve the problems of low efficiency, poor accuracy and insufficient safety of existing cryogenic liquid analysis and sampling methods.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A low-temperature liquid vaporization sampling and analysis system.

[0007] Furthermore, it includes a vaporization input unit, an automatic analysis unit, a manual sampling unit, an automatic sampling unit, an analyzer, and a sampling bottle. The automatic analysis unit, the manual sampling unit, and the automatic sampling unit are connected to the output of the vaporization input unit.

[0008] The input terminal of the vaporization input unit is connected to the cryogenic liquid medium, vaporizes the cryogenic liquid and controls the pressure output to the automatic analysis unit, manual sampling unit and automatic sampling unit;

[0009] The automatic analysis unit monitors the pressure and temperature of the input medium and transmits the thermally compensated and pressure-corrected medium to the analyzer for analysis.

[0010] The manual sampling unit controls the pressure manually and stores the input medium in a sampling bottle;

[0011] The automatic sampling unit automatically samples the medium according to preset sampling parameters. After purging the sampling bottle, it fills the sample and monitors the input medium pressure to achieve high-purity, pressure-adjustable automated sampling.

[0012] Furthermore, the vaporization input unit includes a vaporizer, a pneumatic valve S1, a pressure regulating valve PV01, and an automatic pressure regulating valve PCV01. The vaporizer, pneumatic valve S1, pressure regulating valve PV01, and automatic pressure regulating valve PCV01 are connected in series in a fluid connection. The pneumatic valve S1 is used to control the inflow of the medium. After the cryogenic liquid is vaporized by the vaporizer, it passes through the pressure regulating valve PV01 for coarse pressure adjustment and the automatic pressure regulating valve PCV01 for fine pressure adjustment before outputting the medium to be sampled and analyzed.

[0013] Furthermore, the automatic analysis unit includes a pressure regulating valve PV02, a pressure sensor PT, a temperature sensor TT, a thermally compensated electronic pressure regulating valve H-PVC01, and a flow meter FL01. The pressure regulating valve PV02, the thermally compensated electronic pressure regulating valve H-PVC01, and the flow meter FL01 are connected in series in a fluid connection. The pressure sensor PT and the temperature sensor TT are connected in series between the pressure regulating valve PV02 and the thermally compensated electronic pressure regulating valve H-PVC01 to provide feedback on the medium pressure and temperature information.

[0014] The input terminal of the pressure regulating valve PV01 is connected to the vaporization input unit to receive the medium, and the output terminal of the flow meter FL01 is fluidly connected to the analyzer to realize the automatic output of a quantitative medium with adjustable pressure and temperature for analysis.

[0015] Furthermore, the manual sampling unit includes ball valve BV01, ball valve A-BV01, and ball valve B-BV01. Ball valve BV01, ball valve A-BV01, the sampling bottle, and ball valve B-BV01 are connected in series in a fluid connection. The input end of ball valve BV01 is connected to the vaporization input unit to receive the medium, and the output end of ball valve B-BV01 is connected in parallel with the third port of the thermally compensated electronic pressure regulating valve H-PVC01 to the ANS to discharge waste gas.

[0016] Furthermore, the automatic sampling unit includes a pressure regulating valve PV03, a flow controller FL, a gas storage tank, an FS tank, a pressure regulating valve PV06, a pressure regulating valve PV07, a pressure regulating valve PV04, a pressure sensor PT01, a pressure sensor PT02, a pressure regulating valve G-PV01, a pressure regulating valve N-PV01, and a pressure regulating valve PV05.

[0017] Pressure regulating valve PV03, flow controller FL, lower chamber of gas storage tank, and pressure regulating valve PV04 are connected in series in a fluid connection. The input end of pressure regulating valve PV03 is connected to the vaporization input unit to receive the medium. The input ends of pressure regulating valve G-PV01 and pressure regulating valve PV05 are connected in parallel in a fluid connection to the output end of pressure regulating valve PV04. Pressure sensor PT01 is located at the output end of pressure regulating valve PV04.

[0018] The pressure regulating valve G-PV01, the sampling bottle, and the pressure regulating valve N-PV01 are connected in series in a fluid connection, and the pressure sensor PT02 is located at the output end of the pressure regulating valve N-PV01;

[0019] The output terminals of pressure regulating valve N-PV01 and pressure regulating valve PV05 are connected in parallel to ANS to discharge exhaust gas.

[0020] The FS tank is fluidly connected to the gas storage tank to monitor the displacement of the mold inside the gas storage tank. The input terminals of the pressure regulating valve PV06 and the pressure regulating valve PV07 are respectively connected to the protective gas. Their output terminals are connected in parallel to the upper chamber of the gas storage tank to achieve pressure control of the lower chamber of the gas storage tank.

[0021] Furthermore, the cryogenic liquid vaporization sampling and analysis method, based on the aforementioned cryogenic liquid vaporization sampling and analysis system, includes automatic analysis, automatic sampling, manual sampling, and automatic alarm functions. The automatic analysis function utilizes the vaporization input unit and the automatic analysis unit to automatically monitor the medium pressure and temperature and output a quantitative sample of the medium to be analyzed. The automatic sampling function utilizes the vaporization input unit and the automatic sampling unit to achieve precise sampling of the medium through a process of gas storage, purging, filling, and venting, ensuring that the sampling time and pressure meet the set requirements. The manual sampling function utilizes the vaporization input unit and the manual sampling unit to manually control the flow of the medium to replace the sampling bottle and complete the medium sampling. The automatic alarm function monitors the operating status of the cryogenic liquid vaporization sampling and analysis system and the operation of the automatic analysis, automatic sampling, and manual sampling functions in real time, and responds to abnormal conditions by automatically alarming and shutting off some valves in the system.

[0022] Furthermore, the vaporization process of the vaporization input unit includes:

[0023] S1. The vaporizer preheats the cryogenic liquid to a set temperature;

[0024] S2, the pneumatic valve S1 and the pressure regulating valve PV01 are opened, and the cryogenic liquid is vaporized through the vaporizer;

[0025] S3. The vaporized medium flows through the automatic pressure regulating valve PCV01 to regulate the medium pressure and is delivered to the automatic analysis unit or the manual sampling unit or the automatic sampling unit.

[0026] Furthermore, the automatic analysis function's analysis process includes:

[0027] T1, The pressure regulating valve PV02 opens to receive the input medium;

[0028] T2, the pressure sensor PT and the temperature sensor TT monitor the pressure and temperature of the medium in real time, and use the thermal compensation electronic pressure regulating valve H-PVC01 to perform thermal compensation and pressure correction on the input medium;

[0029] The medium after T3, thermal compensation, and pressure correction is quantitatively and at a constant speed delivered to the analyzer for analysis through the flow meter FL01.

[0030] Furthermore, the automatic sampling function includes the following automatic sampling process:

[0031] A1. When the pressure regulating valve PV03 is opened to receive the input medium, the gas storage tank begins to store gas, and the FS tank monitors the displacement of the diaphragm inside the gas storage tank and the pressures V1 and V2 of the upper and lower chambers in real time.

[0032] A2. When the gas storage tank is fully charged, the pressure regulating valve PV03 is closed, and the pressure regulating valves PV04, G-PV01, N-PV01, and PV07 are opened. Protective gas passes through the pressure regulating valve PV07 to press the diaphragm inside the gas storage tank to purge the sampling bottle.

[0033] A3. After purging, the pressure regulating valve N-PV01 is closed to flush the sampling bottle. When the pressure of the pressure sensor PT01 reaches the set standard, the pressure regulating valve G-PV01 is closed to complete the sampling of the medium.

[0034] A4. The pressure regulating valve PV05 is opened to vent the residual gas in the gas storage tank and pipeline until the pressure of the FS tank and V2 is 0. Then, the pressure regulating valves PV04, PV05, and PV06 are opened to vent the upper chamber of the gas storage tank until the gas pressure in the upper chamber of the gas storage tank is 0. Then, the pressure regulating valve PV06 is closed to complete the automatic sampling.

[0035] Furthermore, when the automatic alarm function is triggered, it shuts off the pneumatic valve S1 and the pressure regulating valve PV01. The triggering conditions include:

[0036] When the pneumatic valve S1 and the pressure regulating valve PV01 are open, an alarm is triggered if the outlet pressure of the automatic pressure regulating valve PCV01 is 0.

[0037] When the pressure regulating valve PV03 is open, an alarm is triggered if the flow controller FL does not change its value.

[0038] An alarm will be triggered if the air pressure in the FS tank, the upper chamber of the gas storage tank, or the lower chamber of the gas storage tank is abnormal during the gas storage process.

[0039] When the pressure regulating valve G-PV01 and the pressure regulating valve N-PV01 are open, if the pressure values ​​detected by the pressure sensor PT01 and the pressure sensor PT02 are not equal, an alarm will be triggered.

[0040] When the pressure regulating valve PV02 is opened, the pressure sensor PT is 0 and there is no change, which triggers an alarm.

[0041] If the outlet pressure or flow rate of the flow controller FL or the automatic pressure regulating valve PCV01 exceeds the set fluctuation range, an alarm will be triggered and the pressure regulating valve PV03 will be shut off.

[0042] Compared with existing technologies, the cryogenic liquid vaporization sampling and analysis system described in this utility model has the following advantages:

[0043] (1) The low-temperature liquid vaporization sampling and analysis system described in this utility model is applied to industrial gas production and trade to ensure its purity and quality. In particular, it can be used as an important means and method for quality control in the trade and transfer of LNG, liquid nitrogen, liquid ammonia, liquid helium, etc.

[0044] (2) The automatic analysis function described in this utility model accurately controls the pressure, temperature and flow rate through the automatic pressure regulating valve PCV01, the thermal compensation electronic pressure regulating valve H-PVC01 and the flow controller FL, so as to realize the rapid vaporization and accurate analysis of low temperature liquids and improve the detection efficiency.

[0045] (3) The automatic sampling function described in this utility model, after the system is preheated, automatically controls the sampling process through valves S1, PV01, PV03 and pressure sensors PT, PT01. The gas storage tank ensures the sampling accuracy through diaphragm displacement detection tank FS and pressure monitoring V1, V2. The sampling bottle completes the sampling through the process of purging, filling and emptying, realizing fully automated sampling, reducing human intervention and improving sampling efficiency and consistency;

[0046] (4) The manual sampling function described in this utility model controls the medium delivery and sampling bottle replacement through manual ball valves BV01, A-BV01, and B-BV01, supports manual sampling during automatic system maintenance or abnormality, provides a backup sampling method, and ensures sampling continuity.

[0047] (5) The automatic alarm function described in this utility model integrates multiple sensors (such as pressure sensor PT, temperature sensor TT, flow meter FL01) and alarm logic, monitors the system status in real time, supports system self-test, and automatically triggers alarm and shuts off valves when an abnormality is detected. It covers multiple alarm scenarios such as abnormal valve start-up, abnormal gas tank, and abnormal analysis function, and avoids quality problems or safety accidents caused by system failure. Attached Figure Description

[0048] 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 thereof. In the drawings:

[0049] Figure 1 This is a schematic diagram of the low-temperature liquid vaporization sampling and analysis system described in this practical embodiment;

[0050] Figure 2 This is a schematic diagram of the low-temperature liquid vaporization sampling and analysis method described in this practical embodiment;

[0051] Figure 3 This is a schematic diagram of the hydraulic principle of the cryogenic liquid vaporization sampling and analysis system described in this utility model embodiment;

[0052] Figure 4 This is a schematic diagram illustrating the principle of the automatic alarm function described in this utility model embodiment.

[0053] Explanation of reference numerals in the attached figures:

[0054] 1-Cryogenic liquid medium; 2-Analyzer; 3-Sampling bottle; 4-Vaporization input unit; 401-Vaporizer; 402-Cryogenic shut-off valve; S1-Pneumatic valve; PV01-Pressure regulating valve; PCV01-Automatic pressure regulating valve; 5-Automatic analysis unit; PV02-Pressure regulating valve; PT-Pressure sensor; TT-Temperature sensor; H-PVC01-Thermal compensated electronic pressure regulating valve; FL01-Flow meter; 6-Manual sampling unit; BV01-Ball valve A-BV01 Ball Valve; B-BV01 Ball Valve; 7 Automatic Sampling Unit; 701 Gas Storage Tank; 702 FS Tank; PV03 Pressure Regulating Valve; FL Flow Controller; PV04 Pressure Regulating Valve; PV06 Pressure Regulating Valve; PV07 Pressure Regulating Valve; PT01 Pressure Sensor; PT02 Pressure Sensor; G-PV01 Pressure Regulating Valve; N-PV01 Pressure Regulating Valve; PV05 Pressure Regulating Valve; 8 ANS; 9 Hoses. Detailed Implementation

[0055] It should be noted that, unless otherwise specified, the embodiments and features described in this utility model can be combined with each other.

[0056] 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 used 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, a feature 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.

[0057] 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 fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art will be able to understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0058] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0059] Example 1: Cryogenic Liquid Vaporization Sampling and Analysis System

[0060] like Figure 1 The system includes a vaporization input unit 4, an automatic analysis unit 5, a manual sampling unit 6, an automatic sampling unit 7, an analyzer 2, and a sampling bottle 3. The automatic analysis unit 5, manual sampling unit 6, and automatic sampling unit 7 are connected to the output of the vaporization input unit 4. The input of the vaporization input unit 4 is connected to a cryogenic liquid medium 1 (including cryogenic liquids such as LNG, liquid nitrogen, liquid ammonia, and liquid helium). The vaporization of the cryogenic liquid and the pressure control output are sent to the automatic analysis unit 5, manual sampling unit 6, and automatic sampling unit 7. The automatic analysis unit 5 monitors the pressure and temperature of the input medium and transmits the thermally compensated and pressure-corrected medium to the analyzer 2 for analysis. The manual sampling unit 6 manually controls the pressure and stores the input medium in the sampling bottle 3. The automatic sampling unit 7 automatically samples the medium according to preset sampling parameters. After purging the sampling bottle 3, it refills the sample and monitors the input medium pressure, achieving high-purity, pressure-adjustable automated sampling.

[0061] Specific examples Figure 3 As shown, the vaporization input unit 4 includes a vaporizer 401, a pneumatic valve S1S1, a pressure regulating valve PV01, and an automatic pressure regulating valve PCV01. The vaporizer 401, pneumatic valve S1S1, pressure regulating valve PV01, and automatic pressure regulating valve PCV01 are connected in series via fluid connection. The pneumatic valve S1S1 controls the inflow of the medium. The cryogenic liquid is vaporized by the vaporizer 401 and then sequentially passes through the pressure regulating valve PV01 for coarse pressure adjustment and the automatic pressure regulating valve PCV01 for fine pressure adjustment before being output as the medium to be sampled and analyzed. Optionally, the vaporization input unit 4 also includes a cryogenic shut-off valve 402, a pressure sensor Px1, and a curing chamber. The cryogenic shut-off valve 402 is located at the sample inlet probe of the vaporizer 401 to prevent backflow of the vaporized gas medium. The pressure sensor Px1 is located at the outlet of the automatic pressure regulating valve PCV01 to monitor the medium pressure. The curing chamber is located on the pipeline connecting the pneumatic valve S1S1 and the pressure regulating valve PV01.

[0062] As shown in Figure 2, the automatic analysis unit 5 includes a pressure regulating valve PV02, a pressure sensor PT, a temperature sensor TT, a thermally compensated electronic pressure regulating valve H-PVC01, and a flow meter FL01. The pressure regulating valve PV02, the thermally compensated electronic pressure regulating valve H-PVC01, and the flow meter FL01 are connected in series. The pressure sensor PT and the temperature sensor TT are connected in series between the pressure regulating valve PV02 and the thermally compensated electronic pressure regulating valve H-PVC01 to provide feedback on the medium's pressure and temperature. The input end of the pressure regulating valve PV01 is connected to a vaporization input valve 4 to receive the medium, and the output end of the flow meter FL01 is fluidly connected to the analyzer 2, enabling the automated output of a quantitative medium with adjustable pressure and temperature for analysis. Optionally, a pressure gauge PG and a temperature gauge TG are also provided on the pipeline connecting the pressure regulating valve PV02 and the thermally compensated electronic pressure regulating valve H-PVC01 to display the real-time pressure and temperature of the medium. The analyzer 2 can be connected to precision analytical instruments such as a chromatograph, a calorific value analyzer, a dew point meter, and a total sulfur analyzer.

[0063] Specific examples Figure 3 As shown, the manual sampling unit 6 includes ball valves BV01, A-BV01, and B-BV01. Ball valves BV01, A-BV01, sampling bottle 3, and ball valve B-BV01 are connected in series via fluid connection. The input end of ball valve BV01 is connected to a vaporization input valve 4 to receive the medium. The output end of ball valve B-BV01 is connected in parallel with the third port of the thermally compensated electronic pressure regulating valve H-PVC01 to ANS8 to discharge exhaust gas. Optionally, sampling bottle 3 is fluidly connected to ball valve B-BV01 via hose 9; if the sampling object is LNG, ANS8 can be replaced with BOG.

[0064] Specific examples Figure 3As shown, the automatic sampling unit 7 includes a pressure regulating valve PV03, a flow controller FL, a gas storage tank 701, an FS tank 702, pressure regulating valves PV06, PV07, and PV04, pressure sensors PT01 and PT02, pressure regulating valves G-PV01, N-PV01, and PV05. Pressure regulating valves PV03, FL, the lower chamber of gas storage tank 701, and PV04 are connected in series via fluid connection. The input terminal of pressure regulating valve PV03 is connected to a vaporization input valve 4 to receive the medium. The input terminals of pressure regulating valves G-PV01 and PV05 are connected in parallel via fluid connection to the output terminal of pressure regulating valve PV04. Pressure sensor PT01 is located at the output of pressure regulating valve PV04; pressure regulating valve G-PV01, sampling bottle 3, and pressure regulating valve N-PV01 are connected in series via fluid connection, and pressure sensor PT02 is located at the output of pressure regulating valve N-PV01; the outputs of pressure regulating valve N-PV01 and pressure regulating valve PV05 are connected in parallel to ANS8 to discharge waste gas; FS tank 702 is fluidly connected to gas storage tank 701 to monitor the displacement of the mold inside gas storage tank 701; the inputs of pressure regulating valve PV06 and pressure regulating valve PV07 are respectively connected to protective gas, and their outputs are connected in parallel to the upper chamber of gas storage tank 701 via fluid connection to achieve pressure control of the lower chamber of gas storage tank 701. Optionally, pressure sensor PTV1 is installed in the upper chamber of gas storage tank 701 to monitor the pressure in the upper chamber.

[0065] Optionally, a shut-off valve CV01 is installed at the junction of the ball valve B-BV01 output end and the third port of the thermally compensated electronic pressure regulating valve H-PVC01; a shut-off valve CV03 is installed at the output end of the pressure regulating valve PV05; and a shut-off valve CV02 is installed at the outlet of the pressure sensor PT02. The sampling bottle 3 is preferably a 500ml sulfur passivated steel cylinder. The vaporizer 401 has a rated voltage of 24V and a power of 500W. Its vaporization power is suitable for media with a minimum temperature of -200℃ to achieve instantaneous vaporization. The heating power of the vaporization device can be adjusted according to different media to maintain a certain temperature for delivery.

[0066] Example 2: Cryogenic liquid vaporization sampling and analysis method based on Example 1:

[0067] like Figure 2As shown, the sampling and analysis method includes automatic analysis, automatic sampling, manual sampling, and automatic alarm functions. The automatic analysis function uses vaporization input sheet 4 and automatic analysis unit 5 to automatically monitor the medium pressure and temperature and output a quantitative sample of the medium to be analyzed. The automatic sampling function uses vaporization input sheet 4 and automatic sampling unit 7 to achieve accurate sampling of the medium through a process of gas storage, purging, filling, and venting, ensuring that the sampling time and pressure meet the set requirements. The manual sampling function uses vaporization input sheet 4 and manual sampling unit 6 to manually control the flow of the medium to replace the sampling bottle 3 and complete the sampling. The automatic alarm function monitors the operating status of the cryogenic liquid vaporization sampling and analysis system and the operation of the automatic analysis, automatic sampling, and manual sampling functions in real time, and responds to abnormal conditions by automatically alarming and shutting off some valves in the system. Automatic analysis function: preheating → vaporization → pressure regulation and monitoring → analysis preparation → analysis; Automatic sampling function: gas storage → purging → sampling → venting → exhaust; Manual sampling function: replacement → sampling → venting; Automatic alarm function includes valve abnormality alarm, automatic sampling function abnormality alarm, automatic analysis function abnormality alarm, and system self-test alarm.

[0068] Example 3: An application based on Example 2:

[0069] Vaporization Input Sheet 4: The vaporization process includes:

[0070] S1. Vaporizer 401 preheats the cryogenic liquid to the set temperature;

[0071] S2, pneumatic valve S1, and pressure regulating valve PV01 are opened, and the cryogenic liquid is vaporized through vaporizer 401.

[0072] S3. The vaporized medium flows through the automatic pressure regulating valve PCV01 to regulate the medium pressure and is delivered to the automatic analysis unit 5, the manual sampling unit 6, or the automatic sampling unit 7.

[0073] Example 4: An application based on Example 2:

[0074] The automated analysis process includes:

[0075] T1, Pressure regulating valve PV02 is opened to receive the input medium;

[0076] T2, pressure sensor PT, and temperature sensor TT monitor the pressure and temperature of the medium in real time, and use the thermal compensation electronic pressure regulating valve H-PVC01 to perform thermal compensation and pressure correction on the input medium;

[0077] The medium after T3, thermal compensation, and pressure correction is quantitatively and at a constant speed delivered to the analyzer 2 via the flow meter FL01 for analysis.

[0078] Example 5: An application based on Example 2:

[0079] The automatic sampling function includes the following automatic sampling process:

[0080] A1. Pressure regulating valve PV03 opens to receive input medium, gas storage tank 701 starts storing gas, and FS tank 702 monitors the displacement of the diaphragm inside gas storage tank 701 and the pressure V1 and V2 of the upper and lower chambers in real time.

[0081] A2. When the gas storage tank 701 is fully stored, the pressure regulating valve PV03 is closed, and the pressure regulating valves PV04, G-PV01, N-PV01, and PV07 are opened. The protective gas passes through the pressure regulating valve PV07 to squeeze the inner diaphragm of the gas storage tank 701 to purge the sampling bottle 3.

[0082] A3. After purging, the pressure regulating valve N-PV01 is closed to flush the sampling bottle 3. When the pressure of the pressure sensor PT01 reaches the set standard, the pressure regulating valve G-PV01 is closed to complete the sampling of the medium.

[0083] A4. Open pressure regulating valve PV05 to vent residual gas from gas storage tank 701 and pipeline until the pressure of FS tank 702 and V2 is 0. Then open pressure regulating valves PV04, PV05 and PV06 to vent gas from the upper chamber of gas storage tank 701 until the gas pressure in the upper chamber of gas storage tank 701 is 0. Then close pressure regulating valve PV06 to complete automatic sampling.

[0084] Example 6: An application based on Example 2:

[0085] like Figure 4 As shown, when the automatic alarm function is triggered, it shuts off pneumatic valve S1S1 and pressure regulating valve PV01. The triggering conditions include:

[0086] Valve Abnormal Alarm: When pneumatic valve S1S1 and pressure regulating valve PV01 are open, an alarm is triggered if the outlet pressure (Px1) of automatic pressure regulating valve PCV01 is 0, and all valves can be closed; when pressure regulating valve PV03 is open, an alarm is triggered if the flow controller FL does not change; when pressure regulating valves G-PV01 and N-PV01 are open, an alarm is triggered if the pressure values ​​detected by pressure sensors PT01 and PT02 are not equal; when pressure regulating valve PV02 is open, an alarm is triggered if pressure sensor PT is 0 and does not change; when pressure regulating valve PV03 is open, an alarm is triggered if pressure sensor PT01 is 0 and does not change.

[0087] Automatic sampling function malfunction alarm: When the gas storage tank 701 is storing gas, if the gas pressure in the FS tank 702, the upper chamber of the gas storage tank 701, or the lower chamber of the gas storage tank 701 is abnormal, an alarm will be triggered.

[0088] Automatic analysis function malfunction alarm: When the outlet pressure or flow rate of the flow controller FL or automatic pressure regulating valve PCV01 exceeds the set fluctuation range, an alarm will be triggered and the pressure regulating valve PV03 will be shut off.

[0089] System self-check alarm: Regularly and automatically check the status of all valves, and trigger an alarm if any abnormality is found.

[0090] The information transmission, signal processing, valve control method, and control logic involved in the technical solution described in this application can all be implemented using existing technologies.

[0091] The above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A cryogenic liquid vaporization sampling and analysis system characterized by: It includes a vaporization input unit (4), an automatic analysis unit (5), a manual sampling unit (6), an automatic sampling unit (7), an analyzer (2), and a sampling bottle (3). The automatic analysis unit (5), the manual sampling unit (6), and the automatic sampling unit (7) are connected to the output of the vaporization input unit (4). The input terminal of the vaporization input unit (4) is connected to the cryogenic liquid medium (1), vaporizes the cryogenic liquid and controls the pressure output to the automatic analysis unit (5), the manual sampling unit (6), and the automatic sampling unit (7); The automatic analysis unit (5) monitors the pressure and temperature of the input medium and transmits the thermally compensated and pressure-corrected medium to the analyzer (2) for analysis. The manual sampling unit (6) manually controls the pressure and stores the input medium in the sampling bottle (3); The automatic sampling unit (7) automatically samples the medium according to the preset sampling parameters. After the sampling bottle (3) is purged, the sample is filled and the input medium pressure is monitored to achieve high-purity, pressure-adjustable automatic sampling.

2. The cryogenic liquid vaporization sampling analysis system of claim 1, wherein: The vaporization input unit (4) includes a vaporizer (401), a pneumatic valve (S1), a pressure regulating valve (PV01), and an automatic pressure regulating valve (PCV01). The vaporizer (401), pneumatic valve (S1), pressure regulating valve (PV01), and automatic pressure regulating valve (PCV01) are connected in series in a fluid connection. The pneumatic valve (S1) is used to control the inflow of the medium. The low-temperature liquid is vaporized by the vaporizer (401) and then passes through the pressure regulating valve (PV01) for coarse pressure adjustment and the automatic pressure regulating valve (PCV01) for fine pressure adjustment before outputting the medium to be sampled and analyzed.

3. The cryogenic liquid vaporization sampling analysis system of claim 1, wherein: The automatic analysis unit (5) includes a pressure regulating valve (PV02), a pressure sensor (PT), a temperature sensor (TT), a thermally compensated electronic pressure regulating valve (H-PVC01), and a flow meter (FL01). The pressure regulating valve (PV02), the thermally compensated electronic pressure regulating valve (H-PVC01), and the flow meter (FL01) are connected in series in a fluid connection. The pressure sensor (PT) and the temperature sensor (TT) are connected in series between the pressure regulating valve (PV02) and the thermally compensated electronic pressure regulating valve (H-PVC01) to provide feedback on the medium pressure and temperature information. The pressure regulating valve (PV01) is connected to the vaporization input unit (4) to receive the medium, and the flow meter (FL01) is fluidly connected to the analyzer (2) to realize the automatic output of a quantitative medium with adjustable pressure and temperature for analysis.

4. The cryogenic liquid vaporization sampling analysis system of claim 3, wherein: The manual sampling unit (6) includes ball valve (BV01), ball valve (A-BV01), and ball valve (B-BV01). Ball valve (BV01), ball valve (A-BV01), the sampling bottle (3), and ball valve (B-BV01) are connected in series in a fluid connection. The input end of ball valve (BV01) is connected to the vaporization input unit (4) to receive the medium. The output end of ball valve (B-BV01) is connected in parallel with the third port of the thermal compensation electronic pressure regulating valve (H-PVC01) to the ANS (8) to discharge waste gas.

5. The cryogenic liquid vaporization sampling analysis system of claim 1, wherein: The automatic sampling unit (7) includes a pressure regulating valve (PV03), a flow controller (FL), a gas storage tank (701), an FS tank (702), a pressure regulating valve (PV06), a pressure regulating valve (PV07), a pressure regulating valve (PV04), a pressure sensor (PT01), a pressure sensor (PT02), a pressure regulating valve (G-PV01), a pressure regulating valve (N-PV01), and a pressure regulating valve (PV05); The pressure regulating valve (PV03), flow controller (FL), lower chamber of gas storage tank (701), and pressure regulating valve (PV04) are connected in series in a fluid connection. The input end of the pressure regulating valve (PV03) is connected to the vaporization input unit (4) to receive the medium. The input ends of the pressure regulating valve (G-PV01) and the input ends of the pressure regulating valve (PV05) are connected in parallel in a fluid connection to the output end of the pressure regulating valve (PV04). The pressure sensor (PT01) is located at the output end of the pressure regulating valve (PV04). The pressure regulating valve (G-PV01), the sampling bottle (3), and the pressure regulating valve (N-PV01) are connected in series in a fluid connection, and the pressure sensor (PT02) is located at the output end of the pressure regulating valve (N-PV01); The output terminals of the pressure regulating valve (N-PV01) and the pressure regulating valve (PV05) are connected in parallel to the flow rate of the ANS (8) to discharge the exhaust gas; The FS tank (702) is fluidly connected to the gas storage tank (701) to monitor the displacement of the mold inside the gas storage tank (701). The input terminals of the pressure regulating valve (PV06) and the pressure regulating valve (PV07) are respectively connected to the protective gas. The output terminals of the two are connected in parallel to the upper chamber of the gas storage tank (701) to achieve pressure control of the lower chamber of the gas storage tank (701).

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