Hydrogen purification device for hydrogen production from natural gas

Abstract

The invention provides a hydrogen purification device for hydrogen production from natural gas and a control method of the hydrogen purification device. The device comprises a PSA device, a regeneration system, an exhaust system, a product hydrogen buffer tank, an impurity detection module, an impurity treatment module and a hydrogen conveying pipeline. The impurity detection module adopts a TDLAS (tunable diode laser absorption spectroscopy) sensor, a CO absorption signal is enhanced through a metal organic framework (MOFs) material, and ppm-level CO concentration detection is realized. And the impurity treatment module utilizes a platinum-based or palladium-based catalyst to convert CO into CO2 under the conditions of optimized catalytic temperature and air inflow. According to the scheme, through a closed-loop control strategy, catalytic conditions are adjusted in real time, effective conversion of CO is ensured, the hydrogen purification efficiency and purity are improved, energy consumption and operation cost are reduced, and the method is suitable for production and industrial application of high-purity hydrogen.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen production from natural gas, and in particular to a hydrogen purification device for hydrogen production from natural gas. Background Art

[0002] In the process of producing hydrogen from natural gas, hydrogen purification is one of the key steps. Traditional purification methods, such as pressure swing adsorption (PSA) technology, can effectively separate hydrogen, but often cannot completely remove trace impurities, especially carbon monoxide (CO). The presence of CO will seriously affect the quality of hydrogen, especially in applications such as fuel cells that require extremely high hydrogen purity. Therefore, the development of a purification device that can effectively detect and remove CO is of great significance for improving hydrogen purity and ensuring the safety of hydrogen energy applications. This program aims to achieve high-precision detection and efficient conversion of CO by combining advanced sensor technology and catalytic conversion technology, thereby improving the overall efficiency and effect of hydrogen purification.

[0003] Tunable diode laser absorption spectroscopy (TDLAS) technology has been proposed as a solution for detecting and measuring CO concentration due to its high sensitivity and fast response time. However, the existing TDLAS technology has some shortcomings in practical industrial applications, such as sensitivity to environmental changes, limitation of spectral resolution, equipment complexity and cost, maintenance and stability issues, and light source stability. These shortcomings may lead to a decrease in measurement accuracy and affect the accuracy and reliability of gas detection.

[0004] In view of the limitations of the existing TDLAS technology, this scheme proposes an improved hydrogen purification device, which uses a TDLAS sensor and coats the inner wall of a long optical path reflection tube with metal organic framework (MOFs) material to enhance the absorption signal of CO, thereby improving the selectivity and sensitivity of detection. The introduction of MOFs material not only enhances the adsorption capacity of CO, but also improves the specific detection of CO by the sensor. In addition, by integrating advanced control algorithms and catalytic conversion technologies, this scheme realizes efficient treatment of CO impurities and ensures that the purity of hydrogen meets the requirements of specific applications. Through these innovations, this scheme aims to provide an efficient, low-cost and stable hydrogen purification solution to meet the needs of industrial-scale hydrogen production. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a hydrogen purification device for producing hydrogen from natural gas, comprising a PSA device, a regeneration system, an exhaust system, a product hydrogen buffer tank, an impurity detection module, an impurity treatment module and a hydrogen delivery pipeline;

[0006] The PSA device is connected to the regeneration system, and the regeneration system is connected to the exhaust system;

[0007] The PSA device is connected to the product hydrogen buffer tank, the product hydrogen buffer tank is connected to the impurity detection module and the impurity treatment module, and the impurity treatment module is connected to the hydrogen delivery pipeline;

[0008] The PSA device is used to separate and purify hydrogen by utilizing the difference in adsorption capacity of the adsorbent for different gas components through periodic pressure changes;

[0009] The regeneration system is used to desorb the adsorbed impurity gas after the adsorbent has been saturated with the impurity gas, by reducing the pressure, increasing the temperature or introducing the regeneration gas, so as to regenerate the adsorbent;

[0010] The exhaust system is used to safely discharge the desorbed impurity gases into the atmosphere or transport them to subsequent treatment facilities;

[0011] The product hydrogen buffer tank is used to store and stabilize the hydrogen produced by the PSA unit;

[0012] The impurity detection module is used to analyze the CO impurity content in hydrogen;

[0013] The impurity processing module is used to further process the detected CO impurities;

[0014] Hydrogen transmission pipelines are used to transport processed high-purity hydrogen to the final point of use or storage facilities.

[0015] The impurity detection module includes a precision sensor, which detects trace amounts of CO in the product hydrogen to obtain the content and concentration of CO;

[0016] The impurity detection module sends the acquired CO content and concentration to the impurity processing module, and the impurity processing module controls the catalytic temperature and intake air volume of the impurity processing module according to the CO content and concentration to convert CO into CO2.

[0017] The impurity detection module includes a heater, an oxygen inlet and a mesh ultra-thin sheet catalyst. The mesh ultra-thin sheet catalyst selects a platinum-based catalyst or a palladium-based catalyst, and the heater is used to control the temperature of the catalyst.

[0018] The precision sensor is a TDLAS sensor, including:

[0019] a. Laser transmitter: used to emit laser light of a specific wavelength, which corresponds to the absorption spectrum of carbon monoxide;

[0020] b. Long optical path reflection tube: The long optical path reflection tube is used to provide a long optical path so that the laser can be reflected multiple times in the tube, thereby increasing the interaction time with the gas sample and improving the detection sensitivity; a layer of metal organic framework MOFs material is coated on the inner wall of the reflection tube, and the MOFs material has a specific adsorption capacity for CO;

[0021] c. Detector: used to receive the laser reflected from the gas sample and detect the absorption spectrum;

[0022] d. Signal processing unit: receives the spectral signal detected by the detector and converts it into CO concentration and content information;

[0023] e. Control unit: controls the operation of the entire TDLAS sensor, including wavelength tuning of the laser transmitter, data acquisition of the detector, and communication with the impurity processing module, based on the data provided by the signal processing unit;

[0024] The detection limit of the TDLAS sensor reaches the ppm level.

[0025] MOFs materials are formed by self-assembly of zinc ions and 2,5-pyrazine dicarboxylic acid ligands, and have a one-dimensional hexagonal pore structure; unsaturated metal sites can interact strongly with CO molecules to produce specific adsorption of CO. At the same time, the MOFs have good reflective properties after coating, and the reflectivity reaches more than 95%;

[0026] The material has good chemical stability in a wide temperature range and can be used for a long time under the operating conditions of the impurity detection module without deactivation; the MOFs material can be regenerated by simple temperature adjustment or gas purge after adsorption saturation;

[0027] The MOFs material is uniformly coated on the inner wall of the long optical path reflection tube through the sol-gel method to form a continuous and dense coating. The coating thickness is precisely controlled between 100 nanometers and 500 nanometers to optimize the absorption signal intensity of CO.

[0028] A method for controlling the purification of hydrogen for producing hydrogen from natural gas, using the hydrogen purification device for producing hydrogen from natural gas, comprises the following steps:

[0029] a. Initialization step: start the device and preheat it to ensure that all modules reach a stable operating temperature;

[0030] b.PSA operation steps: Start the PSA device and start the hydrogen separation and purification process through periodic pressure changes;

[0031] c. Regeneration and exhaust step: When the adsorbent reaches adsorption saturation, start the regeneration system to desorb the impurity gas by reducing the pressure, increasing the temperature or introducing regeneration gas, and then safely discharge the desorbed impurity gas through the exhaust system;

[0032] d. Buffering and detection steps: The hydrogen produced by the PSA device is transported to the product hydrogen buffer tank for storage and pressure stabilization, and a portion of the hydrogen is sent to the impurity detection module for detection of CO content and concentration;

[0033] e. Data processing and feedback step: According to the CO content and concentration data output by the impurity detection module, the catalytic temperature and intake air volume of the impurity treatment module are adjusted through the control algorithm to optimize the conversion efficiency of CO to CO2;

[0034] f. Impurity treatment step: In the impurity treatment module, CO is converted into CO2 using a platinum-based or palladium-based catalyst under controlled temperature and intake air volume conditions;

[0035] g. Hydrogen transportation step: transporting the treated high-purity hydrogen to the final use point or storage facility through a hydrogen transportation pipeline;

[0036] h. Monitoring and adjustment steps: Monitor the operating status of the device in real time, including parameters such as pressure, temperature, flow rate, etc., and make adjustments as needed to ensure the stability of the purification process and the purity of hydrogen.

[0037] The specific steps of the impurity detection module to detect CO content and concentration are as follows:

[0038] The TDLAS sensor in the impurity detection module is used to collect CO absorption spectrum data in the product hydrogen;

[0039] Compare the collected absorption spectrum data with the known CO absorption spectrum to determine the characteristic absorption peak of the CO molecule;

[0040] Perform baseline correction on the absorption spectrum to remove baseline drift caused by instrument or environmental factors;

[0041] Determine the peak position of the CO characteristic absorption peak in the corrected spectrum;

[0042] Calculate the area of ​​the CO characteristic absorption peak, which is proportional to the concentration of CO;

[0043] Establish a standard curve between CO concentration and peak area, which is obtained by measuring CO samples with known concentrations in advance;

[0044] According to the peak area and standard curve, the actual concentration of CO in the product hydrogen is calculated;

[0045] The calculated CO concentration is output in the form of a digital signal for subsequent processing by the impurity processing module;

[0046] The CO concentration data is sent to the impurity processing module so that the catalytic temperature and intake air volume can be adjusted according to the CO concentration to ensure that CO is effectively converted into CO2.

[0047] According to the CO content and concentration data output by the impurity detection module, the catalytic temperature and intake air volume of the impurity treatment module are adjusted through the control algorithm as follows:

[0048] The impurity processing module receives the CO concentration data from the impurity detection module;

[0049] Analyze the received CO concentration data using a preset control algorithm to determine the required catalyst temperature and intake air volume adjustment range;

[0050] According to the results of algorithm analysis, the heater output is adjusted to control the catalyst to reach the optimal catalytic temperature and promote the oxidation reaction of CO;

[0051] According to the results of the algorithm analysis, the flow rate of the oxygen inlet is adjusted to provide an appropriate amount of oxygen to react with CO to generate CO2;

[0052] During the adjustment process, the catalyst temperature and intake air volume are monitored in real time to ensure that they are within the set control range;

[0053] The effects of the adjusted catalyst temperature and intake air volume are fed back to the control algorithm to form a closed-loop control to achieve precise control of the CO conversion rate;

[0054] Real-time monitoring data and feedback information are used to continuously optimize the catalyst temperature and intake air volume until the CO conversion rate reaches the predetermined target.

[0055] The beneficial effects of the present invention are:

[0056] First, by using TDLAS technology combined with specific MOFs materials, high sensitivity and high selectivity detection of CO impurities in hydrogen are achieved, significantly improving the detection accuracy; secondly, the improved TDLAS sensor design reduces the impact of environmental factors on the measurement results and enhances the stability and reliability of the system; thirdly, through closed-loop control strategies and precise catalytic conversion modules, effective removal of CO impurities is achieved, ensuring high purity of hydrogen; in addition, the design of the device reduces energy consumption and operating costs, and improves the overall efficiency of hydrogen purification; finally, the solution has a high degree of automation, reduces manual intervention and maintenance requirements, and improves the convenience and safety of operation. In summary, this solution provides an efficient, economical and reliable solution for hydrogen purification in the process of natural gas hydrogen production.

[0057] This solution achieves accurate detection and efficient conversion of CO impurities in hydrogen by integrating a PSA device, a TDLAS sensor, and a platinum-based or palladium-based catalyst. The high sensitivity and selectivity of the TDLAS sensor ensure accurate measurement of CO, while the use of platinum-based or palladium-based catalysts ensures efficient conversion of CO to CO2. In addition, the closed-loop control strategy of this solution further improves the stability and reliability of the purification process. By real-time monitoring and automatic adjustment of the catalytic temperature and intake volume, this solution can ensure that the hydrogen purity meets the strict requirements of industrial applications, while reducing energy consumption and operating costs and improving the overall efficiency of hydrogen purification. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0059] Attached Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0060] Attached Figure 2 This is a schematic diagram of the sensor structure of the present invention. DETAILED DESCRIPTION

[0061] Embodiment 1:

[0062] The detection principle of the present invention is based on the unique combination of TDLAS technology and MOFs materials, which utilizes the specific adsorption characteristics of MOFs to CO and the effect of such adsorption on spectral absorption. In the TDLAS sensor, the laser emitted by the laser transmitter passes through a gas sample containing hydrogen and CO impurities, part of which is absorbed by the MOFs material and the other part is reflected back. The MOFs material is coated on the inner wall of the long optical path reflection tube, forming a surface with high adsorption capacity for CO.

[0063] When CO molecules are adsorbed by MOFs materials, the optical properties of MOFs change, resulting in a decrease in their reflectivity. This change in reflectivity is proportional to the concentration of CO, so it can be used as an indicator for detecting CO concentration. At the same time, due to the adsorption of CO molecules on the surface of MOFs materials, lasers are absorbed by CO molecules when passing through MOFs materials, and this absorption causes the intensity of lasers at specific wavelengths to weaken. By measuring this absorption spectrum, the concentration of CO can be accurately determined.

[0064] The high porosity and large specific surface area of ​​MOFs materials provide a large number of adsorption sites for CO molecules, enhancing the adsorption capacity of CO. In addition, the optical properties of MOFs materials enable them to effectively change the reflection and absorption of lasers after adsorbing CO, thereby improving the sensitivity of the detection system. This detection method combining TDLAS technology and MOFs materials can not only realize real-time monitoring of CO impurities, but also accurately detect them within a low concentration range of ppm level, meeting the strict requirements for CO impurity control in high-purity hydrogen production. Through this high-precision detection and control, the present invention ensures the high efficiency of the hydrogen purification process and the quality of the final product, which is of great significance for promoting the development of hydrogen energy technology.

[0065] See also Figure 1 to Figure 2 , the present invention provides a hydrogen purification device for producing hydrogen from natural gas, including a PSA device, a regeneration system, an exhaust system, a product hydrogen buffer tank, an impurity detection module, an impurity processing module and a hydrogen delivery pipeline;

[0066] The PSA device is connected to the regeneration system, and the regeneration system is connected to the exhaust system;

[0067] The PSA device is connected to the product hydrogen buffer tank, the product hydrogen buffer tank is connected to the impurity detection module and the impurity treatment module, and the impurity treatment module is connected to the hydrogen delivery pipeline;

[0068] The PSA device is used to separate and purify hydrogen by utilizing the difference in adsorption capacity of the adsorbent for different gas components through periodic pressure changes;

[0069] The regeneration system is used to desorb the adsorbed impurity gas after the adsorbent has been saturated with the impurity gas, by reducing the pressure, increasing the temperature or introducing the regeneration gas, so as to regenerate the adsorbent;

[0070] The exhaust system is used to safely discharge the desorbed impurity gases into the atmosphere or transport them to subsequent treatment facilities;

[0071] The product hydrogen buffer tank is used to store and stabilize the hydrogen produced by the PSA unit;

[0072] The impurity detection module is used to analyze the CO impurity content in hydrogen;

[0073] The impurity processing module is used to further process the detected CO impurities;

[0074] Hydrogen transmission pipelines are used to transport processed high-purity hydrogen to the final point of use or storage facilities.

[0075] The impurity detection module includes a precision sensor, which detects trace amounts of CO in the product hydrogen to obtain the content and concentration of CO;

[0076] The impurity detection module sends the acquired CO content and concentration to the impurity processing module, and the impurity processing module controls the catalytic temperature and intake air volume of the impurity processing module according to the CO content and concentration to convert CO into CO2.

[0077] The impurity detection module includes a heater, an oxygen inlet and a mesh ultra-thin sheet catalyst. The mesh ultra-thin sheet catalyst selects a platinum-based catalyst or a palladium-based catalyst, and the heater is used to control the temperature of the catalyst.

[0078] The precision sensor is a TDLAS sensor, including:

[0079] a. Laser transmitter: used to emit laser light of a specific wavelength, which corresponds to the absorption spectrum of carbon monoxide;

[0080] b. Long optical path reflection tube: The long optical path reflection tube is used to provide a long optical path so that the laser can be reflected multiple times in the tube, thereby increasing the interaction time with the gas sample and improving the detection sensitivity; a layer of metal organic framework MOFs material is coated on the inner wall of the reflection tube, and the MOFs material has a specific adsorption capacity for CO;

[0081] c. Detector: used to receive the laser reflected from the gas sample and detect the absorption spectrum;

[0082] d. Signal processing unit: receives the spectral signal detected by the detector and converts it into CO concentration and content information;

[0083] e. Control unit: controls the operation of the entire TDLAS sensor, including wavelength tuning of the laser transmitter, data acquisition of the detector, and communication with the impurity processing module, based on the data provided by the signal processing unit;

[0084] The detection limit of the TDLAS sensor reaches the ppm level.

[0085] MOFs materials are formed by self-assembly of zinc ions and 2,5-pyrazine dicarboxylic acid ligands, and have a one-dimensional hexagonal pore structure; unsaturated metal sites can interact strongly with CO molecules to produce specific adsorption of CO. At the same time, the MOFs have good reflective properties after coating, and the reflectivity reaches more than 95%;

[0086] The material has good chemical stability in a wide temperature range and can be used for a long time under the operating conditions of the impurity detection module without deactivation; the MOFs material can be regenerated by simple temperature adjustment or gas purge after adsorption saturation;

[0087] The MOFs material is uniformly coated on the inner wall of the long optical path reflection tube through the sol-gel method to form a continuous and dense coating. The coating thickness is precisely controlled between 100 nanometers and 500 nanometers to optimize the absorption signal intensity of CO.

[0088] Embodiment 2:

[0089] A method for controlling the purification of hydrogen for producing hydrogen from natural gas, using the hydrogen purification device for producing hydrogen from natural gas, comprises the following steps:

[0090] a. Initialization step: start the device and preheat it to ensure that all modules reach a stable operating temperature;

[0091] b.PSA operation steps: Start the PSA device and start the hydrogen separation and purification process through periodic pressure changes;

[0092] c. Regeneration and exhaust step: When the adsorbent reaches adsorption saturation, start the regeneration system to desorb the impurity gas by reducing the pressure, increasing the temperature or introducing regeneration gas, and then safely discharge the desorbed impurity gas through the exhaust system;

[0093] d. Buffering and detection steps: The hydrogen produced by the PSA device is transported to the product hydrogen buffer tank for storage and pressure stabilization, and a portion of the hydrogen is sent to the impurity detection module for detection of CO content and concentration;

[0094] e. Data processing and feedback step: According to the CO content and concentration data output by the impurity detection module, the catalytic temperature and intake air volume of the impurity treatment module are adjusted through the control algorithm to optimize the conversion efficiency of CO to CO2;

[0095] f. Impurity treatment step: In the impurity treatment module, CO is converted into CO2 using a platinum-based or palladium-based catalyst under controlled temperature and intake air volume conditions;

[0096] g. Hydrogen transportation step: transporting the treated high-purity hydrogen to the final use point or storage facility through a hydrogen transportation pipeline;

[0097] h. Monitoring and adjustment steps: Monitor the operating status of the device in real time, including parameters such as pressure, temperature, flow rate, etc., and make adjustments as needed to ensure the stability of the purification process and the purity of hydrogen.

[0098] The specific steps of the impurity detection module to detect CO content and concentration are as follows:

[0099] The TDLAS sensor in the impurity detection module is used to collect CO absorption spectrum data in the product hydrogen;

[0100] Compare the collected absorption spectrum data with the known CO absorption spectrum to determine the characteristic absorption peak of the CO molecule;

[0101] Perform baseline correction on the absorption spectrum to remove baseline drift caused by instrument or environmental factors;

[0102] Determine the peak position of the CO characteristic absorption peak in the corrected spectrum;

[0103] Calculate the area of ​​the CO characteristic absorption peak, which is proportional to the concentration of CO;

[0104] Establish a standard curve between CO concentration and peak area, which is obtained by measuring CO samples with known concentrations in advance;

[0105] According to the peak area and standard curve, the actual concentration of CO in the product hydrogen is calculated;

[0106] The calculated CO concentration is output in the form of a digital signal for subsequent processing by the impurity processing module;

[0107] The CO concentration data is sent to the impurity processing module so that the catalytic temperature and intake air volume can be adjusted according to the CO concentration to ensure that CO is effectively converted into CO2.

[0108] According to the CO content and concentration data output by the impurity detection module, the catalytic temperature and intake air volume of the impurity treatment module are adjusted through the control algorithm as follows:

[0109] The impurity processing module receives the CO concentration data from the impurity detection module;

[0110] Analyze the received CO concentration data using a preset control algorithm to determine the required catalyst temperature and intake air volume adjustment range;

[0111] According to the results of algorithm analysis, the heater output is adjusted to control the catalyst to reach the optimal catalytic temperature and promote the oxidation reaction of CO;

[0112] According to the results of the algorithm analysis, the flow rate of the oxygen inlet is adjusted to provide an appropriate amount of oxygen to react with CO to generate CO2;

[0113] During the adjustment process, the catalyst temperature and intake air volume are monitored in real time to ensure that they are within the set control range;

[0114] The effects of the adjusted catalyst temperature and intake air volume are fed back to the control algorithm to form a closed-loop control to achieve precise control of the CO conversion rate;

[0115] Real-time monitoring data and feedback information are used to continuously optimize the catalyst temperature and intake air volume until the CO conversion rate reaches the predetermined target.

[0116] The specific CO concentration calculation process includes the following steps:

[0117] a. Spectral data processing steps: Remove noise and outliers from the raw spectral data obtained by the TDLAS sensor.

[0118] b. Baseline correction step: Use appropriate mathematical methods, such as least squares method or polynomial fitting, to perform baseline correction on the spectral data.

[0119] c. Characteristic peak identification step: Identify the characteristic absorption peak of CO in the corrected spectrum.

[0120] d. Peak area calculation steps: By integrating the area under the CO characteristic absorption peak, calculate the peak area proportional to the CO concentration.

[0121] e. Standard curve establishment steps: Use a CO standard gas sample with a known concentration to establish a standard curve between peak area and CO concentration.

[0122] f. Concentration conversion step: Compare the calculated peak area with the standard curve and convert it to obtain the actual CO concentration value.

[0123] g. Data output step: Convert the calculated CO concentration value into a digital signal and output it to the control system.

[0124] h. Control algorithm adjustment steps: The control system adjusts the catalyst temperature and intake air volume through the control algorithm according to the output CO concentration value.

[0125] i. Feedback control step: Feedback the adjusted catalyst temperature and intake air volume to the TDLAS sensor for the next round of CO concentration detection and control adjustment.

[0126] j. Safety threshold setting step: Set the safety threshold of CO concentration. Once the detected CO concentration exceeds the threshold, the safety alarm is triggered and the emergency treatment procedure is started.

[0127] Thus far, the description of the above-described embodiments is provided for the purpose of illustration and description. It is not intended to be exhaustive or to limit the present disclosure. The individual elements or features of a specific embodiment are generally not subject to the limitations of the specific embodiment, but when applicable, they can be interchanged and used for selected embodiments even if not specifically shown or described. In many respects, the same element or feature also can be changed. This variation is not considered to be a departure from the present disclosure, and all such modifications are intended to be included in the scope of the present disclosure.

[0128] Example embodiments are provided so that the present disclosure will be thorough and the scope will be fully conveyed to those skilled in the art. In order to thoroughly understand the embodiments of the present disclosure, numerous details are set forth, such as examples of specific parts, devices, and methods. Obviously, for those skilled in the art, it is not necessary to use specific details, the example embodiments can be implemented in many different forms, and neither should be construed as limiting the scope of the present disclosure. In certain example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.

[0129] Here, specialized vocabulary is used only for the purpose of describing specific example embodiments, and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "a" and "the" used herein may be intended to include plural forms as well. The terms "including" and "having" are inclusive, and therefore specify the presence of the claimed features, wholes, steps, operations, elements and / or components, but do not exclude the presence or additional presence of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof. Unless the order of execution is clearly indicated, the method steps, processing and operations described herein are not interpreted as necessarily needing to be performed in the specific order discussed and shown. It should also be understood that additional or optional steps may be adopted.

Claims

1. A hydrogen purification device for hydrogen production from natural gas, comprising a PSA device, a regeneration system, an exhaust system, a product hydrogen buffer tank, an impurity detection module, an impurity treatment module and a hydrogen delivery pipeline; characterized in that: The PSA device is connected to the regeneration system, and the regeneration system is connected to the exhaust system; The PSA device is connected to the product hydrogen buffer tank, the product hydrogen buffer tank is connected to the impurity detection module and the impurity treatment module, and the impurity treatment module is connected to the hydrogen transmission pipeline; The PSA device is used to separate and purify hydrogen by utilizing the difference in adsorption capacity of the adsorbent for different gas components through periodic pressure changes; The regeneration system is used to desorb the adsorbed impurity gas after the adsorbent has been saturated with the impurity gas by reducing the pressure, increasing the temperature or introducing the regeneration gas, so that the adsorbent can be regenerated; the exhaust system is used to safely discharge the desorbed impurity gas into the atmosphere or transport it to subsequent treatment facilities; The product hydrogen buffer tank is used to store and stabilize the hydrogen produced by the PSA unit; The impurity detection module is used to analyze the CO impurity content in hydrogen; The impurity processing module is used to further process the detected CO impurities; Hydrogen transmission pipelines are used to transport processed high-purity hydrogen to the final point of use or storage facilities.

2. A hydrogen purification device for producing hydrogen from natural gas according to claim 1, characterized in that: The impurity detection module includes a precision sensor, which detects trace amounts of CO in the product hydrogen to obtain the content and concentration of CO; The impurity detection module sends the acquired CO content and concentration to the impurity processing module, and the impurity processing module controls the catalytic temperature and intake air volume of the impurity processing module according to the CO content and concentration to convert CO into CO2.

3. A hydrogen purification device for producing hydrogen from natural gas according to claim 2, characterized in that: The impurity detection module includes a heater, an oxygen inlet and a mesh ultra-thin sheet catalyst. The mesh ultra-thin sheet catalyst selects a platinum-based catalyst or a palladium-based catalyst, and the heater is used to control the temperature of the catalyst.

4. A hydrogen purification device for producing hydrogen from natural gas according to claim 2, characterized in that: The precision sensor is a TDLAS sensor, including: a. Laser transmitter: used to emit laser light of a specific wavelength, which corresponds to the absorption spectrum of carbon monoxide; b. Long optical path reflection tube: The long optical path reflection tube is used to provide a long optical path so that the laser can be reflected multiple times in the tube, thereby increasing the interaction time with the gas sample and improving the detection sensitivity; a layer of metal organic framework MOFs material is coated on the inner wall of the reflection tube, and the MOFs material has a specific adsorption capacity for CO; c. Detector: used to receive the laser reflected from the gas sample and detect the absorption spectrum; d. Signal processing unit: receives the spectral signal detected by the detector and converts it into CO concentration and content information; e. Control unit: controls the operation of the entire TDLAS sensor, including wavelength tuning of the laser transmitter, data acquisition of the detector, and communication with the impurity processing module, based on the data provided by the signal processing unit; The detection limit of the TDLAS sensor reaches the ppm level.

5. A hydrogen purification device for producing hydrogen from natural gas according to claim 4, characterized in that: MOFs materials are formed by self-assembly of zinc ions and 2,5-pyrazine dicarboxylic acid ligands, and have a one-dimensional hexagonal pore structure; unsaturated metal sites can interact strongly with CO molecules to produce specific adsorption of CO. At the same time, the MOFs have good reflective properties after coating, and the reflectivity reaches more than 95%; The material has good chemical stability in a wide temperature range and can be used for a long time under the operating conditions of the impurity detection module without deactivation; the MOFs material can be regenerated by simple temperature adjustment or gas purge after adsorption saturation; The MOFs material is uniformly coated on the inner wall of the long optical path reflection tube through the sol-gel method to form a continuous and dense coating. The coating thickness is precisely controlled between 100 nanometers and 500 nanometers to optimize the absorption signal intensity of CO.

6. A method for controlling the purification of hydrogen for hydrogen production from natural gas, using a hydrogen purification device for hydrogen production from natural gas according to any one of claims 1 to 5, characterized in that The steps include: a. Initialization step: start the device and preheat it to ensure that all modules reach a stable operating temperature; b.PSA operation steps: Start the PSA device and start the hydrogen separation and purification process through periodic pressure changes; c. Regeneration and exhaust step: When the adsorbent reaches adsorption saturation, start the regeneration system to desorb the impurity gas by reducing the pressure, increasing the temperature or introducing regeneration gas, and then safely discharge the desorbed impurity gas through the exhaust system; d. Buffering and detection steps: The hydrogen produced by the PSA device is transported to the product hydrogen buffer tank for storage and pressure stabilization, and a portion of the hydrogen is sent to the impurity detection module for detection of CO content and concentration; e. Data processing and feedback step: According to the CO content and concentration data output by the impurity detection module, the catalytic temperature and intake air volume of the impurity treatment module are adjusted through the control algorithm to optimize the conversion efficiency of CO to CO2; f. Impurity treatment step: In the impurity treatment module, CO is converted into CO2 using a platinum-based or palladium-based catalyst under controlled temperature and intake air volume conditions; g. Hydrogen transportation step: transporting the treated high-purity hydrogen to the final use point or storage facility through a hydrogen transportation pipeline; h. Monitoring and adjustment steps: Monitor the operating status of the device in real time, including parameters such as pressure, temperature, flow rate, etc., and make adjustments as needed to ensure the stability of the purification process and the purity of hydrogen.

7. The method for controlling the purification of hydrogen for producing hydrogen from natural gas according to claim 6, characterized in that: The specific steps of the impurity detection module to detect CO content and concentration are as follows: The TDLAS sensor in the impurity detection module is used to collect the CO absorption spectrum data in the product hydrogen; the collected absorption spectrum data is compared with the known CO absorption spectrum to determine the characteristic absorption peak of the CO molecule; Perform baseline correction on the absorption spectrum to remove baseline drift caused by instrument or environmental factors; Determine the peak position of the CO characteristic absorption peak in the corrected spectrum; Calculate the area of ​​the CO characteristic absorption peak, which is proportional to the concentration of CO; Establish a standard curve between CO concentration and peak area, which is obtained by measuring CO samples with known concentrations in advance; According to the peak area and standard curve, the actual concentration of CO in the product hydrogen is calculated; The calculated CO concentration is output in the form of a digital signal for subsequent processing by the impurity processing module; The CO concentration data is sent to the impurity processing module so that the catalytic temperature and intake air volume can be adjusted according to the CO concentration to ensure that CO is effectively converted into CO2.

8. The hydrogen purification control method for producing hydrogen from natural gas according to claim 6, characterized in that: According to the CO content and concentration data output by the impurity detection module, the catalytic temperature and intake air volume of the impurity treatment module are adjusted through the control algorithm as follows: The impurity processing module receives the CO concentration data from the impurity detection module; Analyze the received CO concentration data using a preset control algorithm to determine the required catalyst temperature and intake air volume adjustment range; According to the results of algorithm analysis, the heater output is adjusted to control the catalyst to reach the optimal catalytic temperature and promote the oxidation reaction of CO; According to the results of the algorithm analysis, the flow rate of the oxygen inlet is adjusted to provide an appropriate amount of oxygen to react with CO to generate CO2; During the adjustment process, the catalyst temperature and intake air volume are monitored in real time to ensure that they are within the set control range; the effects of the adjusted catalyst temperature and intake air volume are fed back to the control algorithm to form a closed-loop control to achieve precise control of the CO conversion rate; Real-time monitoring data and feedback information are used to continuously optimize the catalyst temperature and intake air volume until the CO conversion rate reaches the predetermined target.

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