Liquid helium filling process and filling system

Abstract

The invention relates to the technical field of gas storage and management, in particular to a liquid helium filling process and a filling system.The liquid helium filling process comprises the following steps that firstly, a salt cavern helium extraction pump is started, the pressure and speed of the extraction pump are adjusted, extracted helium is obtained, then the pressure and temperature data of the extracted helium are measured, and whether the pressure and temperature data meet the primary treatment standard or not is verified; and obtaining preliminary measurement data. According to the invention, by adjusting the pressure and speed of the extraction pump, the initial extraction process of helium is optimized, so that the helium can better adapt to the quality fluctuation of original gas. And continuous monitoring and secondary detection steps are added in the purification stage, so that the purity of helium is improved, and the impurity content is reduced. In the liquefying and filling process, temperature and pressure parameters are set, the accuracy of the filling amount is ensured through measurement, and the stability and safety of products are guaranteed. In conclusion, the operation flexibility is enhanced, the overall performance of the product is improved, and wider commercial and scientific research requirements are met.

Description

Technical Field

[0001] This invention relates to the field of gas storage and management technology, and in particular to a liquid helium filling process and filling system. Background Technology

[0002] Marine engineering is a comprehensive engineering and technical field involving marine resource development, marine environmental protection, and the construction and operation of offshore facilities. It encompasses multiple aspects such as offshore platforms, subsea pipelines, deep-sea exploration, shipbuilding, and marine energy development (such as oil and gas, wind power, and natural gas hydrates).

[0003] In marine engineering, common problems in gas storage and management include the impact of raw gas quality fluctuations on the quality of the final product, and insufficient temperature and pressure control during liquefaction. These technical limitations often make it difficult to guarantee product purity and stability, especially in applications requiring high precision. The lack of effective real-time data monitoring and adjustment mechanisms makes existing systems ill-equipped to cope with changes in raw materials and deviations in the process. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and to propose a liquid helium filling process and filling system.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a liquid helium filling process, comprising the following steps:

[0006] First, turn on the salt cavern helium extraction pump, adjust the pressure and speed of the extraction pump to obtain extracted helium, and then measure the extracted helium pressure and temperature data to verify whether it meets the preliminary processing standards and obtain preliminary measurement data.

[0007] The extraction pump was adjusted using the preliminary measurement data, and the extracted helium was purified, including the removal of nitrogen and oxygen. During the purification process, the chemical composition and purity of the helium were continuously monitored, and a second test was performed to verify the purification effect and obtain purification confirmation data.

[0008] Based on the purification confirmation data, set the temperature and pressure parameters of the liquefaction machine, start the liquefaction process, and convert helium gas into liquid helium through condensation and compression to generate liquid helium;

[0009] To fill a stainless steel pressure vessel with liquid helium, the following steps are taken: First, the amount of liquid helium in the stainless steel pressure vessel is measured and adjusted using a weighbridge and a level gauge. Then, the purity and temperature of the liquid helium inside the stainless steel pressure vessel are tested, and a filling quality report is generated.

[0010] Preferably, the steps for obtaining the preliminary measurement data are as follows:

[0011] Turn on the salt cavern helium extraction pump and adjust the pressure and speed of the extraction pump to obtain the preliminary operating conditions for helium extraction;

[0012] Based on the preliminary operating conditions of the helium gas, the operating influence factor is determined, and the calculation formula is as follows:

[0013]

[0014] in, The pressure of the helium extraction pump, The speed of the helium extraction pump, The ambient temperature during extraction. Here, Q is the adjustment coefficient, and Q is the operational impact factor.

[0015] Based on the aforementioned operational influence factors, the helium data were verified to meet the preliminary processing standards, and preliminary measurement data were obtained.

[0016] Preferably, the step of obtaining the purification confirmation data is as follows:

[0017] The extraction pump was adjusted using the preliminary measurement data, and the extracted helium was purified to remove nitrogen and oxygen.

[0018] The chemical composition and purity of helium are monitored, and secondary testing is performed to calculate the performance indicators of the purification process. The calculation formula is as follows:

[0019]

[0020] in, This is the chemical composition index of helium. This refers to the number of repeated tests during the purification process. The coefficient of difference for detection. Indicators representing performance metrics of the purification process;

[0021] The purification effect is determined based on the performance indicators of the purification process. If the effect is achieved, purification confirmation data is obtained.

[0022] Preferably, the step of obtaining liquid helium is as follows:

[0023] Based on the purification confirmation data, the settings of the liquefaction machine were adjusted to obtain the adjusted operating parameters of the liquefaction machine;

[0024] Based on the adjusted liquefaction machine operating parameters, the liquefaction process is started, the compressor is started, the helium is compressed to the pressure level under liquefaction conditions, and then the high-pressure helium is cooled down by the condenser, its physical state is changed, and liquid helium is obtained.

[0025] Continue monitoring the temperature and pressure of the liquid helium until all the helium has been converted into liquid, then shut down the liquefaction unit.

[0026] Preferably, the steps for measuring and adjusting the liquid helium filling volume of the stainless steel pressure vessel using a weighbridge and level gauge are as follows:

[0027] Liquid helium is introduced into a stainless steel pressure vessel through a connecting pipe. The weighbridge and level gauge are then activated to measure the initial amount of liquid helium and obtain the initial liquid helium filling data.

[0028] Based on the initial liquid helium filling data, the helium input rate and time in the stainless steel pressure vessel are adjusted to control the amount of liquid helium added to match the capacity of the vessel.

[0029] Continue monitoring the weighbridge and level gauge until the liquid helium reaches the container's capacity, completing the liquid helium filling process.

[0030] Preferably, the step of obtaining the filling quality report is as follows:

[0031] The purity of liquid helium in a stainless steel pressure vessel was determined, and the temperature was monitored using a temperature sensor to obtain preliminary purity and temperature data of the liquid helium.

[0032] Based on the preliminary purity and temperature data of the liquid helium, the liquid helium is evaluated to determine whether it meets the preset quality standards, and quality analysis data is obtained.

[0033] Preferably, the step of obtaining the filling quality report further includes: compiling a filling quality report based on the quality analysis data, including the purity and temperature of the liquid helium, and generating a filling quality report.

[0034] This invention provides a liquid helium filling system, comprising:

[0035] In the gas extraction module, the salt cavern helium extraction pump is turned on, the pressure and flow rate of the extraction pump are adjusted, the pressure and temperature of the helium are recorded, preliminary data verification is performed, and preliminary measurement data are obtained.

[0036] The gas purification module is used to readjust the parameters of the extraction pump based on the preliminary measurement data, start the helium purification process, remove nitrogen and oxygen, continuously monitor the chemical composition and purity of helium, perform secondary detection, verify the purification effect, and obtain purification confirmation data.

[0037] The liquid helium preparation module is used to set the temperature and pressure parameters of the liquefaction machine based on the purification confirmation data, start the liquefaction process, and convert helium gas into liquid helium through condensation and compression technology to generate liquid helium;

[0038] The filling and adjustment module fills the stainless steel pressure vessel with liquid helium. The filling amount of liquid helium is adjusted by weighbridge and level gauge, and the purity and temperature of the liquid helium in the vessel are detected to complete the filling adjustment.

[0039] The quality inspection module is used to inspect the quality of liquid helium after filling and adjustment, and to measure the purity and temperature of the liquid helium.

[0040] Compared with the prior art, the advantages and positive effects of the present invention are as follows:

[0041] This invention optimizes the initial helium extraction process by adjusting the pressure and speed of the extraction pump, making it more adaptable to fluctuations in the quality of the original gas. Continuous monitoring and secondary detection steps added during the purification stage improve helium purity and reduce impurity content. During liquefaction and filling processes, temperature and pressure parameters are set, and measurements ensure accurate filling volumes, guaranteeing product stability and safety. In summary, this invention not only enhances operational flexibility but also improves overall product performance, meeting a wider range of commercial and research needs. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the steps of the present invention. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0044] Please see Figure 1 This invention provides a technical solution, a liquid helium filling process, comprising the following steps:

[0045] First, turn on the salt cavern helium extraction pump, adjust the pressure and speed of the extraction pump to obtain extracted helium, and then measure the extracted helium pressure and temperature data to verify whether it meets the preliminary processing standards and obtain preliminary measurement data.

[0046] The extraction pump was adjusted using the preliminary measurement data, and the extracted helium was purified, including the removal of nitrogen and oxygen. During the purification process, the chemical composition and purity of the helium were continuously monitored, and a second test was performed to verify the purification effect and obtain purification confirmation data.

[0047] Based on the purification confirmation data, set the temperature and pressure parameters of the liquefaction machine, start the liquefaction process, and convert helium gas into liquid helium through condensation and compression to generate liquid helium;

[0048] To fill a stainless steel pressure vessel with liquid helium, the following steps are taken: First, the amount of liquid helium in the stainless steel pressure vessel is measured and adjusted using a weighbridge and a level gauge. Then, the purity and temperature of the liquid helium inside the stainless steel pressure vessel are tested, and a filling quality report is generated.

[0049] The steps for obtaining preliminary measurement data are as follows:

[0050] Turn on the salt cavern helium extraction pump and adjust the pressure and speed of the extraction pump to obtain the preliminary operating conditions for helium extraction;

[0051] Based on the initial operating conditions of helium, the operating influence factor was determined, and the calculation formula is as follows:

[0052]

[0053] in, The pressure of the helium extraction pump, The speed of the helium extraction pump, The ambient temperature during extraction. Here, Q is the adjustment coefficient, and Q is the operational impact factor.

[0054] Based on the operational impact factor, we verified whether the helium data met the preliminary processing standards and obtained preliminary measurement data.

[0055] Specifically, referring to the basic parameter information and start-up conditions of the salt cavern helium extraction pump listed in the equipment operation manual, the operation steps are recorded and data is correlated item by item. First, the rated pressure range, speed adjustment range, and corresponding electrical control command list of the salt cavern helium extraction pump are obtained from the equipment manual. This data is entered into the operation database in list form. Then, before starting, the status of the inlet and outlet valves on the pump body is checked, the initial parameter data of the motor speed control module is read, and the inlet and outlet pressure values ​​are monitored using digital meters. These values ​​are compared with the basic pressure reference values ​​given in the equipment manual, and the result of the comparison determines whether to adjust the parameters of the motor speed control module. If the pressure value is off... If the deviation exceeds the average deviation obtained from previous experiments (this deviation is obtained by statistically analyzing the pressure deviation distribution in 30 historical start-up operations), the motor speed parameters are reset. The fine-tuning amount of the motor speed parameters is given by the incremental step array recorded in the operation database. The specific value is based on the discrete data comparison table of the relationship between speed and pressure changes in the early stage. Once the speed is adjusted, the pressure is read and compared again. If it still does not meet the reference range, the above adjustment steps are repeated until the pressure is stable within the numerical range of the reference range. At the same time, the current final determined speed value and pressure reading are stored in the data recording file to provide basic data records for the preliminary operating conditions of subsequent helium extraction.

[0056] The advantage of the formula lies in its ability to simultaneously consider pressure. With speed The relative influence, combined with ambient temperature With adjustment coefficient The role of this is to calculate the operational impact factor. This allows for more precise quantitative analysis of the helium extraction process in subsequent data verification and evaluation steps.

[0057] The steps for obtaining the parameters are as follows: After the extraction pump starts, the pump outlet pressure is continuously monitored using a pressure sensor. A pressure data sequence is recorded over a period of time. These data are then filtered to remove obvious outliers, resulting in a stable pressure value. This stable pressure value is obtained through repeated measurements. ;

[0058] The steps for obtaining the parameters are as follows: The rotor speed of the extraction pump is read; multiple sets of speed data are obtained by continuously scanning a certain time series; and the most stable speed value is selected as the value for this test through statistical analysis. The data comes from the cumulative count of the speed monitoring module and the speed is calculated through time intervals;

[0059] The steps for obtaining the parameters are as follows: Measure the ambient temperature using a thermometer; after collecting data from multiple points, average the data; and this average value is... The data comes from multiple temperature measuring instruments installed at the extraction site, and the final temperature is obtained by averaging the multiple measurements.

[0060] The steps for obtaining the parameters are as follows: The adjustment coefficient is obtained by fitting data from multiple previous experiments. This coefficient is obtained by extracting historical working conditions. The values ​​were derived through regression analysis of the curves. Referring to industry standards and data records, 10 sets of data with relatively stable operational effects were selected from previous experiments. Numerical values ​​were substituted, and the least squares method was used for fitting to obtain the results. ;

[0061] Calculation process:

[0062] Substitute the parameter values ​​obtained above into the formula:

[0063]

[0064] First, calculate the molecular part:

[0065]

[0066]

[0067] The molecule is:

[0068]

[0069] The denominator is:

[0070]

[0071] The fractional part is:

[0072]

[0073] Plus :

[0074]

[0075] Calculate the square root of 25.53:

[0076]

[0077] The results indicate that the current operational impact factor is approximately 5.052, which is correlated with the results information corresponding to the operational steps. This can be used to determine whether the helium extraction conditions meet the preliminary processing standards. A higher value indicates a larger overall impact from the operating parameters, requiring further precise control of pressure or speed. When the value is close to or lower than the previously defined baseline value (e.g., the preliminary processing standard threshold obtained through historical data statistics is 5.0), it indicates that the current operating conditions have stabilized and can meet the requirements of the preliminary processing standard.

[0078] The steps for obtaining purification confirmation data are as follows:

[0079] The extraction pump was adjusted using the preliminary measurement data, and the extracted helium was purified to remove nitrogen and oxygen.

[0080] The chemical composition and purity of helium are monitored, and secondary testing is performed to calculate the performance indicators of the purification process. The calculation formula is as follows:

[0081]

[0082] in, This is the chemical composition index of helium. This refers to the number of repeated tests during the purification process. The coefficient of difference for detection. Indicators representing performance metrics of the purification process;

[0083] The purification effect is judged based on the performance indicators of the purification process to determine whether the purification effect has reached the predetermined standard. If the standard is met, purification confirmation data is obtained.

[0084] Specifically, using the current pressure and speed values ​​of the extraction pump recorded in the preliminary measurement data, the speed adjustment amount is entered to update the extraction pump speed parameters, and then the updated pressure reading is recorded again.

[0085] The advantage of the formula lies in its ability to comprehensively consider the chemical composition index of helium. Number of repeated tests and detection difference coefficient The interaction between them makes the obtained performance indicators It can quantitatively present the impact of detection fluctuations during the purification process on the final quality assessment.

[0086] The steps for obtaining the parameters are as follows: The helium gas, after being treated with nitrogen and oxygen, is analyzed five times consecutively using a gas analyzer. The helium purity is recorded as 0.99990, 0.99991, 0.99989, 0.99992, and 0.99990, respectively. The mean and deviation of these five values ​​are then calculated, and the helium chemical composition index is obtained through statistical analysis. This value falls within the common purity range of high-purity helium (the purity of industrial high-purity helium is generally around 99.999%).

[0087] The steps to obtain the parameters are as follows: count the number of consecutive detections mentioned above, i.e., the number of repeated detections. ;

[0088] The steps for obtaining the parameters are as follows: Calculate the standard deviation of the above 5 sets of purity data, use the result as the detection difference coefficient, subtract the mean of 0.99990 from each set of purity data, take the square of the difference, average it, and then take the square root to obtain the standard deviation. This is obtained through actual statistical analysis. .

[0089] Calculation process:

[0090] Substitute the parameters into the formula:

[0091]

[0092] First calculate :

[0093]

[0094] The fractional part is:

[0095]

[0096] Calculation of the index:

[0097]

[0098]

[0099] final:

[0100]

[0101] The results indicate that the current purification process performance index is approximately 0.4471. When this value is close to the previously defined reference threshold (e.g., the threshold determined by statistical analysis of a large amount of purification process data is 0.45), it means that the purification data is consistent with the reference level. If it is greater than 0.45, it indicates that the degree of parameter synergy in the purification process has slightly increased. If it is less than 0.40, it indicates that there are large differences between repeated tests in the purification process, and further optimization of the detection process and purification methods is needed.

[0102] According to predetermined standards, the calculated performance index values ​​are matched and compared. If the values ​​do not meet the standards, an inspection is carried out. The predetermined standards are as follows: retrieve purification operation results data from the previous 90 days, select at least 100 sets of data that have been fully tested and recorded, calculate the purification performance index for each set of data, archive all performance index results in the form of numerical sequences, sort and group the sequences, compare the values ​​of each set of data and calculate the mean and standard deviation, and select the performance index values ​​near the median as the preset standard. The preset standard is set to 0.45.

[0103] The steps for obtaining liquid helium are as follows:

[0104] Based on the purification confirmation data, the settings of the liquefaction machine were adjusted to obtain the adjusted operating parameters of the liquefaction machine;

[0105] Based on the adjusted operating parameters of the liquefaction machine, the liquefaction process is started, the compressor is started, the helium is compressed to the pressure level under liquefaction conditions, and then the high-pressure helium is cooled down by the condenser, its physical state is changed, and liquid helium is obtained.

[0106] Continue monitoring the temperature and pressure of the liquid helium until all the helium has been converted into liquid, then shut down the liquefaction unit.

[0107] Specifically, adjust the temperature control knob and pressure regulating valve of the liquefier to ensure that the temperature is set within the range of -269℃ to -261℃ and the pressure is set between 200 and 250 bar. After adjusting to the preset value, lock the setting.

[0108] After starting the liquefaction process, directly operate the compressor start switch to compress the helium to the specified 250 bar, monitor the pressure indication on the liquefaction machine interface, and monitor the temperature drop of the condenser to ensure that the gas temperature can quickly drop to the set -269℃ before reaching the liquefaction point.

[0109] After helium is completely converted into liquid, the temperature and pressure of the liquid helium are continuously monitored, keeping the temperature below -269°C and the pressure below 260 bar. This is to ensure the stable storage of liquid helium and prevent safety accidents caused by excessive pressure.

[0110] The steps for measuring and adjusting the liquid helium filling volume of a stainless steel pressure vessel using a weighbridge and level gauge are as follows:

[0111] Liquid helium is introduced into a stainless steel pressure vessel through a connecting pipe. The weighbridge and level gauge are then activated to measure the initial amount of liquid helium and obtain the initial liquid helium filling data.

[0112] Based on the initial liquid helium filling data, the helium input rate and time in the stainless steel pressure vessel were adjusted to control the amount of liquid helium added to match the vessel's capacity.

[0113] Continue monitoring the weighbridge and level gauge until the liquid helium reaches the container's capacity, completing the liquid helium filling process.

[0114] Specifically, in the initial stage of liquid helium filling, liquid helium is introduced into a stainless steel pressure vessel through connecting pipes. Then, a weighbridge and a level gauge are activated to measure the volume and weight of the liquid helium. During this process, monitoring equipment such as the weighbridge measures the current weight of the container, while the level gauge records the horizontal height of the liquid helium in the container. This data directly reflects the initial filling amount of liquid helium.

[0115] Based on the initial data on liquid helium filling volume, the helium input rate and duration were adjusted. This adjustment was made based on the volume expansion characteristics of liquid helium and the capacity of the pressure vessel. Real-time feedback from the weighbridge and level gauge was monitored to control the liquid helium injection rate, preventing pressure surges caused by rapid filling while avoiding a decrease in economic benefits due to excessively slow filling speed. This adjustment process was carried out during the adjustment process.

[0116] Continuously monitor the weighbridge and level gauge to ensure that the liquid helium filling level does not exceed the container's design limit. During this phase, deviations must be identified and adjusted immediately until the liquid helium filling level reaches the container's maximum capacity, determined based on the container's physical design and a safety pressure assessment, to avoid any safety risks.

[0117] The steps to obtain a filling quality report are as follows:

[0118] The purity of liquid helium in a stainless steel pressure vessel was determined, and the temperature was monitored using a temperature sensor to obtain preliminary purity and temperature data of the liquid helium.

[0119] Based on preliminary purity and temperature data of liquid helium, assess whether the liquid helium meets the preset quality standards and obtain quality analysis data;

[0120] Based on the quality analysis data, a filling quality report is prepared, including the purity and temperature of the liquid helium.

[0121] Specifically, when determining the purity and temperature of liquid helium in a stainless steel pressure vessel, the operator first ensures that all connections and sensors are correctly installed and calibrated. Then, the spectral lines of impurities in the liquid helium are determined by spectral analysis, and the purity percentage of helium is calculated by comparing it with a standard spectrum. At the same time, the data collected by the temperature sensor is checked to ensure that the temperature of the liquid helium is maintained within a safe range throughout the filling process.

[0122] After obtaining preliminary purity and temperature data of liquid helium, a comprehensive analysis of the data is conducted. The collected purity and temperature data are statistically analyzed, and the deviations between these data and the preset quality standards are compared. Any data points that exceed the normal fluctuation range are analyzed to confirm whether these deviations will affect the final use of helium.

[0123] Based on comprehensive quality analysis data, a filling quality report is prepared. The report details the purity and temperature measurement results of liquid helium, as well as the comparison with standard specifications. During the preparation of the report, the data analysis results are presented intuitively through charts and graphs so that non-professionals can easily understand them.

[0124] This invention provides a liquid helium filling system, comprising:

[0125] In the gas extraction module, the salt cavern helium extraction pump is turned on, the pressure and flow rate of the extraction pump are adjusted, the pressure and temperature of the helium are recorded, preliminary data verification is performed, and preliminary measurement data are obtained.

[0126] The gas purification module is used to readjust the parameters of the extraction pump based on the preliminary measurement data, start the helium purification process, remove nitrogen and oxygen, continuously monitor the chemical composition and purity of helium, perform secondary detection, verify the purification effect, and obtain purification confirmation data.

[0127] The liquid helium preparation module is used to set the temperature and pressure parameters of the liquefaction machine based on the purification confirmation data, start the liquefaction process, and convert helium gas into liquid helium through condensation and compression technology to generate liquid helium;

[0128] The filling and adjustment module fills the stainless steel pressure vessel with liquid helium. The filling amount of liquid helium is adjusted by weighbridge and level gauge, and the purity and temperature of the liquid helium in the vessel are detected to complete the filling adjustment.

[0129] The quality inspection module is used to inspect the quality of liquid helium after filling and adjustment, and to measure the purity and temperature of the liquid helium.

[0130] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments that can be applied to other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A liquid helium filling process, characterized in that, Includes the following steps: First, turn on the salt cavern helium extraction pump, adjust the pressure and speed of the extraction pump to obtain extracted helium, and then measure the extracted helium pressure and temperature data to verify whether it meets the preliminary processing standards and obtain preliminary measurement data. The extraction pump was adjusted using the preliminary measurement data, and the extracted helium was purified, including the removal of nitrogen and oxygen. During the purification process, the chemical composition and purity of the helium were continuously monitored, and a second test was performed to verify the purification effect and obtain purification confirmation data. Based on the purification confirmation data, set the temperature and pressure parameters of the liquefaction machine, start the liquefaction process, and convert helium gas into liquid helium through condensation and compression to generate liquid helium; To fill a stainless steel pressure vessel with liquid helium, the following steps are taken: First, the amount of liquid helium in the stainless steel pressure vessel is measured and adjusted using a weighbridge and a level gauge. Then, the purity and temperature of the liquid helium inside the stainless steel pressure vessel are tested, and a filling quality report is generated.

2. The liquid helium filling process according to claim 1, characterized in that, The steps for obtaining the preliminary measurement data are as follows: Turn on the salt cavern helium extraction pump and adjust the pressure and speed of the extraction pump to obtain the preliminary operating conditions for helium extraction; Based on the preliminary operating conditions of the helium gas, the operating influence factor is determined, and the calculation formula is as follows: in, The pressure of the helium extraction pump, The speed of the helium extraction pump, The ambient temperature during extraction. Here, Q is the adjustment coefficient, and Q is the operational impact factor. Based on the aforementioned operational influence factors, the helium data was verified to meet the preliminary processing standards, and preliminary measurement data were obtained.

3. The liquid helium filling process according to claim 1, characterized in that, The steps for obtaining the purification confirmation data are as follows: The extraction pump was adjusted using the preliminary measurement data, and the extracted helium was purified to remove nitrogen and oxygen. The chemical composition and purity of helium are monitored, and secondary testing is performed to calculate the performance indicators of the purification process. The calculation formula is as follows: in, This is the chemical composition index of helium. This refers to the number of repeated tests during the purification process. The coefficient of difference for detection. Indicates the performance indicators of the purification process; The purification effect is determined based on the performance indicators of the purification process. If the effect is achieved, purification confirmation data is obtained.

4. The liquid helium filling process according to claim 1, characterized in that, The steps for obtaining the liquid helium are as follows: Based on the purification confirmation data, the settings of the liquefaction machine were adjusted to obtain the adjusted operating parameters of the liquefaction machine; Based on the adjusted liquefaction machine operating parameters, the liquefaction process is started, the compressor is started, the helium is compressed to the pressure level under liquefaction conditions, and then the high-pressure helium is cooled down by the condenser, its physical state is changed, and liquid helium is obtained. Continue monitoring the temperature and pressure of the liquid helium until all the helium has been converted into liquid, then shut down the liquefaction unit.

5. The liquid helium filling process according to claim 1, characterized in that, The steps for measuring and adjusting the liquid helium filling volume of a stainless steel pressure vessel using a weighbridge and level gauge are as follows: Liquid helium is introduced into a stainless steel pressure vessel through a connecting pipe. The weighbridge and level gauge are then activated to measure the initial amount of liquid helium and obtain the initial liquid helium filling data. Based on the initial liquid helium filling data, the helium input rate and time in the stainless steel pressure vessel are adjusted to control the amount of liquid helium added to match the capacity of the vessel. Continue monitoring the weighbridge and level gauge until the liquid helium reaches the container's capacity, completing the liquid helium filling process.

6. The liquid helium filling process according to claim 1, characterized in that, The steps for obtaining the filling quality report are as follows: The purity of liquid helium in a stainless steel pressure vessel was determined, and the temperature was monitored using a temperature sensor to obtain preliminary purity and temperature data of the liquid helium. Based on the preliminary purity and temperature data of the liquid helium, the liquid helium is evaluated to determine whether it meets the preset quality standards, and quality analysis data is obtained.

7. The liquid helium filling process according to claim 6, characterized in that, The steps for obtaining the filling quality report further include: compiling a filling quality report based on the quality analysis data, including the purity and temperature of the liquid helium, and generating the filling quality report.

8. A liquid helium filling system according to any one of claims 1-7, characterized in that, include: In the gas extraction module, the salt cavern helium extraction pump is turned on, the pressure and flow rate of the extraction pump are adjusted, the pressure and temperature of the helium are recorded, preliminary data verification is performed, and preliminary measurement data are obtained. The gas purification module is used to readjust the parameters of the extraction pump based on the preliminary measurement data, start the helium purification process, remove nitrogen and oxygen, continuously monitor the chemical composition and purity of helium, perform secondary detection, verify the purification effect, and obtain purification confirmation data. The liquid helium preparation module is used to set the temperature and pressure parameters of the liquefaction machine based on the purification confirmation data, start the liquefaction process, and convert helium gas into liquid helium through condensation and compression technology to generate liquid helium; The filling and adjustment module fills the stainless steel pressure vessel with liquid helium. The filling amount of liquid helium is adjusted by weighbridge and level gauge, and the purity and temperature of the liquid helium in the vessel are detected to complete the filling adjustment. The quality inspection module is used to inspect the quality of liquid helium after filling and adjustment, and to measure the purity and temperature of the liquid helium.

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