A closed loop system for fuel hydrogen quality shift detection and methods of use thereof

Abstract

The application provides a closed loop system for fuel hydrogen quality movement detection and a use method thereof, which comprises a gas source receiving port module, a sample reservation module, a hydrogen storage and accommodation module, a hydrogen gas accommodation module, a chromatographic detection module and a water / oxygen detection module, the front side of the gas source receiving port module is connected with a gas source, the rear side of the gas source receiving port module is connected with the sample reservation module, the hydrogen storage and accommodation module, the chromatographic detection module and the water / oxygen detection module respectively, the rear side of the sample reservation module is connected with the hydrogen storage and accommodation module, the rear side of the hydrogen storage and accommodation module is connected with the hydrogen gas accommodation module and the water / oxygen detection module, and the rear side of the water / oxygen detection module is connected with the hydrogen gas accommodation module. The water / oxygen detection equipment is in a gas protection atmosphere, which effectively prevents water and oxygen in the environment from penetrating into the equipment, effectively guarantees that the detection result is not disturbed by the environment, effectively reduces the demand amount of the hydrogen sample and the detection time, effectively utilizes the hydrogen exhaust, and realizes the complete closed loop of the fuel hydrogen quality detection.

Description

Technical Field

[0001] This invention relates to the field of hydrogen trace impurity detection technology, and in particular to a closed-loop system for detecting the mass movement of fuel hydrogen and its usage method. Background Technology

[0002] Ensuring hydrogen quality is fundamental to the healthy development and large-scale application of the hydrogen energy and fuel cell vehicle industry. Currently, the types and concentrations of impurities in hydrogen are determined by a combination of factors, including raw materials, processing methods, purification technologies, transportation methods, refueling equipment and processes, and operational standardization. To ensure the long-term efficient operation of proton exchange membrane fuel cell vehicles, the impurity content of hydrogen is generally required to be below 10%. -6 Grade, sulfides and halides are required to be within 10. -9 These impurities are numerous and present in low concentrations, requiring sophisticated testing equipment and methods.

[0003] Sample collection is the primary step before trace sample detection. Currently, hydrogen sample collection mainly relies on the sampling equipment prepared based on the hydrogen sampling site, resulting in a lack of universality in the sampling devices. Therefore, it is necessary to combine the existing characteristics of hydrogen refueling guns to make the sampling equipment adaptable to sampling under multiple conditions. In addition, each batch of hydrogen sample collection involves multiple hydrogen replacements, making hydrogen emission a key focus of safety management. Since hydrogen is a hazardous chemical, arbitrary emission is prohibited. Generally, the exhaust gas is collected and centrally burned, leading to reduced hydrogen utilization and a higher risk factor. For the determination of trace impurities such as water and oxygen in hydrogen, dew point meters and micro-oxygen meters are recommended. However, these instruments allow water and oxygen from the air to enter the device after each use and before the next sample measurement. This requires a large amount of hydrogen sample to replace the trace amounts of water and oxygen in the instrument, resulting in a large amount of hydrogen sample required for each water and oxygen measurement and a long detection time. Therefore, it is necessary to provide a closed-loop system for the mobile detection of fuel hydrogen mass. Summary of the Invention

[0004] The purpose of this invention is to provide a closed-loop system and its method for detecting the mass of fuel hydrogen, which effectively ensures that the detection results are not affected by the environment and achieves a complete closed loop for the entire fuel hydrogen mass detection.

[0005] According to one objective of the present invention, a closed-loop system for mobile detection of fuel hydrogen quality is provided, comprising a gas source receiving port module, a sample retention module, a hydrogen storage and consumption module, a hydrogen consumption module, a chromatographic detection module, and a water / oxygen detection module. The front side of the gas source receiving port module is connected to a gas source, and the rear side of the gas source receiving port module is connected to the sample retention module, the hydrogen storage and consumption module, the chromatographic detection module, and the water / oxygen detection module, respectively. The rear side of the sample retention module is connected to the hydrogen storage and consumption module, the rear side of the hydrogen storage and consumption module is connected to the hydrogen consumption module and the water / oxygen detection module, and the rear side of the water / oxygen detection module is connected to the hydrogen consumption module.

[0006] Furthermore, a gas source pressure gauge, a pressure regulator, an output pressure gauge, and a main control valve are sequentially provided between the gas source receiving port module and the sample retention module. The gas source receiving port module includes three receiving ports connected in parallel, and each of the three receiving ports is equipped with a control valve.

[0007] Furthermore, the sample retention module includes sample retention bottle one and sample retention bottle two. Sample retention bottle one and sample retention bottle two are connected to the gas source receiving port module via quick-connect couplings. Sample retention bottle one and sample retention bottle two are respectively connected to the quick-connect couplings via sample retention inlet valve one and sample retention inlet valve two. Sample retention bottle one and sample retention bottle two are respectively connected to the rear side of sample retention bottle one and sample retention bottle two. Sample retention bottle outlet valve one and sample retention bottle outlet valve two are respectively connected to the sample retention bottle external outlet. The sample retention bottle external outlet is connected to the hydrogen storage and consumption module.

[0008] Furthermore, a hydrogen storage and consumption pipeline valve is provided between the hydrogen storage and consumption module and the gas source receiving port module, and a total hydrogen storage and consumption outlet valve is provided between the hydrogen storage and consumption module and the hydrogen consumption module.

[0009] Furthermore, the hydrogen storage and disposal module includes a hydrogen storage and disposal bottle one and a hydrogen storage and disposal bottle two. The hydrogen storage and disposal bottle one and the hydrogen storage and disposal bottle two are respectively connected to the external outlet of the sample retention bottle. The front side of the hydrogen storage and disposal bottle one and the hydrogen storage and disposal inlet valve two are respectively provided, and the rear side of the hydrogen storage and disposal bottle one and the hydrogen storage and disposal outlet valve two are respectively provided.

[0010] Furthermore, the hydrogen consumption module includes a small fuel cell stack, which is connected to the hydrogen storage and consumption module. The bottom of the small fuel cell stack is provided with a drain pipe, the bottom of the small fuel cell stack is provided with a fan, and the top of the bottom of the small fuel cell stack is provided with a battery connection terminal.

[0011] Furthermore, the bottom of the chromatographic detection module is connected to the gas source receiving port module via a sample injection valve. The chromatographic detection module is equipped with a chromatographic working module, which is connected to a venting component. The chromatographic detection module is equipped with a high-purity nitrogen connection, a high-purity helium connection, a compressed air connection, and a high-purity hydrogen connection.

[0012] Furthermore, the water / oxygen detection module is connected to the gas source receiving port module through a second pressure reducing valve, and the water / oxygen detection module is connected to the hydrogen storage and consumption module through a first pressure reducing valve. A purification device is provided between the hydrogen storage and consumption module and the first pressure reducing valve.

[0013] Furthermore, the water / oxygen detection module includes a micro-oxygen meter and a dew point meter. The front ends of the micro-oxygen meter and the dew point meter are respectively provided with a control valve one and a control valve two, and the rear ends of the micro-oxygen meter and the dew point meter are respectively provided with a first one-way control valve and a second one-way control valve.

[0014] According to another objective of the present invention, the present invention provides a method of using the above-described closed-loop system for detecting the mass movement of fuel hydrogen, comprising the following steps:

[0015] S1, System Purge

[0016] The gas in the sample retention module is replaced, the gas source receiving port module and the sample retention module are connected, the sample retention module and the hydrogen storage and consumption module are connected, the connection between the hydrogen storage and consumption module and the hydrogen consumption module is closed, the chromatographic detection module and the water / oxygen detection module are in the closed state, the gas source receiving port module is opened and purging and replacement begin, and the hydrogen storage and consumption module collects the replacement gas;

[0017] S2, Sample filling

[0018] After the purging and replacement are completed, the outlet end of the sample retention module and the hydrogen storage and consumption module are closed, and the opening end of the sample retention module is opened for filling.

[0019] S3, Sample Testing

[0020] After filling is complete, the sample retention module is turned off, and on-site sample testing is performed. The pressure is adjusted to the pressure required by the chromatographic detection module, and the chromatographic detection module starts impurity detection.

[0021] S4, Gas replacement in the water / oxygen detection module pipeline.

[0022] The hydrogen storage and consumption module is activated to replace the gas in the pipeline of the water / oxygen detection module. The water / oxygen detection module is opened to purify the gas. The water / oxygen detection module performs gas replacement and at the same time opens the hydrogen consumption module to directly consume the small amount of hydrogen that is discharged. The hydrogen consumption module stores the current generated.

[0023] S5, begin water / oxygen testing.

[0024] After the chromatographic detection module completes the sample detection, it shuts down the chromatographic detection module and the water / oxygen detection module, and starts water / oxygen detection. The pressure regulator adjusts the pressure at the gas receiving port to the pressure required by the water / oxygen detection module. The gas source receiving port module is connected to the water / oxygen detection module, and the water / oxygen detection module performs water / oxygen measurement. The hydrogen digestion module continues to work.

[0025] S6, the gas in the water / oxygen detection module pipeline is replaced again.

[0026] After completing the water / oxygen detection, shut down the gas source receiving port module, repeat S4 to perform gas replacement in the pipeline of the water / oxygen detection module again, and shut down the water / oxygen detection module when water / oxygen detection is no longer performed in the short term. Finally, shut down the hydrogen storage and consumption module.

[0027] This invention's technical solution meets the detection requirements for trace impurities. The water / oxygen detection equipment operates within a protected gas atmosphere, effectively preventing the infiltration of water and oxygen from the environment, ensuring that the detection results are not interfered with by the environment, while also effectively reducing the amount of hydrogen sample required and the detection time. It also achieves efficient utilization of the emitted hydrogen, realizing a complete closed loop for the entire fuel hydrogen quality detection process. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention.

[0030] In the diagram: 100 - Gas source receiving port module, 101 - TN1 hydrogen refueling gun receiving port, 102 - TN5 hydrogen refueling gun receiving port, 103 - 3 / 8” pipeline receiving port; 104 - First control valve, 105 - Second control valve, 106 - Third control valve, 107 - Gas source pressure gauge, 108 - Pressure regulator, 109 - Output pressure gauge, 110 - Main control valve;

[0031] 200-Sample retention module, 201-Quick connector, 202-Sample retention inlet valve one, 203-Sample retention inlet valve two, 204-Sample retention bottle two, 205-Sample retention outlet valve two, 206-Sample retention bottle one, 207-Sample retention bottle outlet valve one, 208-Sample retention bottle external outlet 208;

[0032] 300 - Hydrogen storage and consumption module, 301 - Hydrogen storage and consumption inlet valve 1, 302 - Hydrogen storage and consumption bottle 1, 303 - Hydrogen storage and consumption outlet valve 1, 304 - Hydrogen storage and consumption inlet valve 2, 305 - Hydrogen storage and consumption bottle 2, 306 - Hydrogen storage and consumption outlet valve 2, 307 - Hydrogen storage and consumption main outlet valve, 308 - Hydrogen storage and consumption pipeline valve;

[0033] 400-Hydrogen consumption module, 401-Small fuel cell stack, 402-Drain pipe, 403-Fan, 404-Battery connection terminal;

[0034] 500-Chromatographic detection module, 501-High-purity nitrogen connection, 501-High-purity helium connection, 504-Compressed air connection, 505-High-purity hydrogen connection, 505-Chromatographic working module, 506-Sample injection valve, 507-Vent assembly;

[0035] 600-Water / Oxygen Detection Module, 601-Control Valve 1, 602-Micro Oxygen Analyzer, 603-First One-Way Control Valve, 604-Control Valve 2, 605-Dew Point Analyzer, 606-Second One-Way Control Valve, 607-Purification Equipment, 608-First Pressure Reducing Valve, 609-Second Pressure Reducing Valve. Detailed Implementation

[0036] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention 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. Therefore, they should not be construed as limiting this invention.

[0038] Furthermore, the terms "first" and "second" 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 as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] Example 1

[0040] like Figure 1 As shown,

[0041] A closed-loop system for mobile detection of fuel hydrogen quality comprises six modules: a gas source receiving port module 100, a sample retention module 200, a hydrogen storage and consumption module 300, a hydrogen consumption module 400, a chromatographic detection module 500, and a water / oxygen detection module 600.

[0042] The front gas receiving port of the gas source receiving port module 100 is connected to the gas source. The rear side of the gas source receiving port module 100 is connected to the sample retention module 200, the hydrogen storage and consumption module 300, the chromatographic detection module 500, and the water / oxygen detection module 600, respectively. The rear side of the sample retention module 200 is connected to the hydrogen storage and consumption module 300. The rear side of the hydrogen storage and consumption module 300 is connected to the hydrogen consumption module 400 and the water / oxygen detection module 600. The rear side of the water / oxygen detection module 600 is connected to the hydrogen consumption module 400.

[0043] The gas source receiving port module 100 is module one, which consists of TN1 hydrogen refueling gun sampling receiving port 101, TN5 hydrogen refueling gun sampling receiving port 102, 3 / 8” pipeline receiving port 103, first control valve 104, second control valve 105, third control valve 106, gas source pressure gauge 107, pressure regulator 108, output pressure gauge 109 and main control valve 110.

[0044] The gas source receiving port module 100 includes three gas receiving ports arranged in parallel: TN1 hydrogen refueling gun sampling receiving port 101, TN5 hydrogen refueling gun sampling receiving port 102, and 3 / 8” pipeline receiving port 103. The three gas receiving ports TN1 hydrogen refueling gun sampling receiving port 101, TN5 hydrogen refueling gun sampling receiving port 102, and 3 / 8” pipeline receiving port 103 are respectively connected to the main pipeline through the corresponding first control valve 104, second control valve 105, and third control valve 106. The main pipeline is equipped with a gas source pressure gauge 107, a pressure regulator 108, an output pressure gauge 109, and a main control valve 110. The main pipeline downstream of the main control valve 110 is connected to the sample retention module 200.

[0045] In this embodiment, the sampling port 101 of the TN1 hydrogen refueling gun is the corresponding port of the hydrogen refueling gun TK 17, which meets the requirements for low flow rate sampling at 35MPa and 70MPa; the sampling port 102 of the TN5 hydrogen refueling gun is the corresponding port of the hydrogen refueling gun TK 25, which meets the requirements for high flow rate sampling at 35MPa; and the 3 / 8” pipeline port 103 is the corresponding sampling port of the hydrogen production plant.

[0046] The sample retention module 200 is module two, which consists of quick-connect connector 201, sample inlet valve one 202, sample inlet valve two 203, sample bottle two 204, sample outlet valve two 205, sample bottle one 206, sample bottle outlet valve one 207, and sample bottle external outlet 208.

[0047] The quick-connector 201 of the sample retention module 200 is connected to the main control valve 110 of the gas source receiving port module 100 via a pipeline. The quick-connector 201 is connected to the second sample bottle 204 and the first sample bottle 206 respectively. The first sample bottle 206 and the second sample bottle 204 are respectively connected to the quick-connector 201 via the first sample inlet valve 202 and the second sample inlet valve 203. The rear side of the first sample bottle 206 and the second sample bottle 204 is respectively connected to the first sample bottle outlet valve 207 and the second sample outlet valve 205. The first sample bottle outlet valve 207 and the second sample outlet valve 205 are respectively connected to the sample bottle outlet 208. The sample bottle outlet 208 is connected to the hydrogen storage and consumption module 300.

[0048] In this embodiment, sample bottle 206 and sample bottle 204 must be passivated to prevent physical adsorption and chemical reaction between the gas cylinder and the sample. This allows for simultaneous sample preservation during on-site measurement and facilitates re-inspection in case of error.

[0049] The hydrogen storage and consumption module 300 is module three, consisting of hydrogen storage and consumption inlet valve 1 301, hydrogen storage and consumption bottle 1 302, hydrogen storage and consumption outlet valve 1 303, hydrogen storage and consumption inlet valve 2 304, hydrogen storage and consumption bottle 2 305, hydrogen storage and consumption outlet valve 2 306, hydrogen storage and consumption main outlet valve 307, and hydrogen storage and consumption pipeline valve 308.

[0050] The hydrogen storage and consumption module 300's hydrogen storage and consumption bottle one 302 and hydrogen storage and consumption bottle two 305 are respectively connected to the sample retention bottle outlet 208 of the sample retention module 200; simultaneously, the hydrogen storage and consumption bottle one 302 and hydrogen storage and consumption bottle two 305 of the hydrogen storage and consumption module 300 are also connected to the pipeline between the output pressure gauge 109 of the gas source receiving port module 100 and the main control valve 110, and are equipped with hydrogen storage and consumption pipeline valves 308. Hydrogen storage and consumption inlet valve one 301 and hydrogen storage and consumption inlet valve two 304 are respectively provided on the front side of hydrogen storage and consumption bottle one 302 and hydrogen storage and consumption bottle two 305. Hydrogen storage and consumption outlet valve one 303 and hydrogen storage and consumption outlet valve two 306 are respectively provided on the rear side of hydrogen storage and consumption bottle one 302 and hydrogen storage and consumption bottle two 305. Hydrogen storage and consumption outlet valve 1 303 and hydrogen storage and consumption outlet valve 2 306 are respectively connected to hydrogen consumption module 400 and water / oxygen detection module 600; and a total hydrogen storage and consumption outlet valve 307 is provided between hydrogen storage and consumption outlet valve 1 303 and hydrogen storage and consumption outlet valve 2 306 and hydrogen consumption module 400.

[0051] In this embodiment, the hydrogen storage and disposal module 300 collects the sample gas cylinder and the bypass gas entering the detection end for reuse.

[0052] The hydrogen storage module 400 is module four, consisting of a small fuel cell stack 401, a drain pipe 402, a fan 403, and a battery connection terminal 404. The small fuel cell stack 401 is connected to the hydrogen storage and storage main outlet valve 307 of the hydrogen storage and storage module 300 via a pipeline. The drain pipe 402 is located at the bottom of the end of the small fuel cell stack 401, the fan 403 is located at the end of the small fuel cell stack 401, and the battery connection terminal 404 is located at the top of the end of the small fuel cell stack 401.

[0053] In this embodiment, the small fuel cell stack 401 is mainly used to consume hydrogen gas, and the current generated is fed into the battery connected to the battery terminal 404 for storage. The fan 403 mainly blows air into the small fuel cell stack 401 to cause a reaction. The battery connected to the battery terminal 404 is generally a lithium battery, alkaline battery or nickel-metal hydride battery or other batteries that meet the requirements.

[0054] The chromatography detection module 500 is module five, consisting of a high-purity nitrogen connection 501, a high-purity helium connection 502, a compressed air connection 503, a high-purity hydrogen connection 504, a chromatography working module 505, a sample injection valve 506, and a venting assembly 507.

[0055] The chromatography detection module 500 is equipped with a high-purity nitrogen connection 501, a high-purity helium connection 502, a compressed air connection 503, and a high-purity hydrogen connection 504. The chromatography detection module 500 has a chromatography working module 505 inside, which is connected to a venting component 507. The bottom of the chromatography detection module 500 is connected to the output pressure gauge 109 of the gas source receiving port module 100 and the main control valve 110 through a pipeline via a sample injection valve 506.

[0056] In this embodiment, the chromatographic detection module 500 mainly uses gas chromatography as its working module to detect non-water, non-oxygen, and non-particulate matter.

[0057] The water / oxygen detection module 600 is module six, which consists of control valve one 601, micro oxygen meter 602, first one-way control valve 603, control valve two 604, dew point meter 605, second one-way control valve 606, purification equipment 607, first pressure reducing valve 608 and second pressure reducing valve 609.

[0058] The water / oxygen detection module 600 includes a micro-oxygen meter 602 and a dew point meter 605. Control valve 601 and control valve 604 are respectively installed at the front ends of the micro-oxygen meter 602 and the dew point meter 605. A first one-way control valve 603 and a second one-way control valve 606 are respectively installed at the rear ends of the micro-oxygen meter 602 and the dew point meter 605. The rear ends of the first one-way control valve 603 and the second one-way control valve 606 are connected to the hydrogen digestion module 400.

[0059] The water / oxygen detection module 600 is connected to the output pressure gauge 109 of the gas source receiving port module 100 and the main control valve 110 via a pipeline through the second pressure reducing valve 609. The water / oxygen detection module 600 is connected to the hydrogen storage and consumption outlet valve 303 and the hydrogen storage and consumption outlet valve 306 of the hydrogen storage and consumption module 300 via the first pressure reducing valve 608, and a purification device 607 is provided between the hydrogen storage and consumption outlet valve 303 and the hydrogen storage and consumption outlet valve 306 and the first pressure reducing valve 608.

[0060] When determining the water / oxygen content in the sample, the hydrogen supplied by the hydrogen storage and absorption module 300 is purified by the purification device 607 and used by the water / oxygen detection module 600 as a protective gas for the instrument during non-detection periods. Utilizing the hydrogen in the hydrogen storage and absorption module 300 ensures the detection equipment is isolated from air, effectively reducing the replacement time required for each batch of samples due to air entering the detection equipment.

[0061] When using this invention:

[0062] The required sample hydrogen is obtained from the gas source receiving port module 100. The gas source receiving port module 100 selects the corresponding receiving port according to the sampling location and determines the receiving port to participate in the sampling, while the other receiving ports remain closed. The obtained gas source is mainly used for filling sample bottle 1 206 and sample bottle 2 204, and another part is connected to the chromatography detection module 500 and the water / oxygen detection module 600 for impurity detection.

[0063] For sample retention vials 1 (206) and 2 (204), the existing gas in the vials must first be displaced. The displacement time should be no less than 120 seconds. The displaced gas is then discharged into hydrogen storage and disposal bottles 1 (302) and 2 (305) to complete the sample retention.

[0064] Sample testing is performed by passing the sample into the testing module. After the water / oxygen testing module 600 completes the sample testing, the gas from hydrogen storage and disposal bottle 1 302 and hydrogen storage and disposal bottle 2 305 is fed into the purification equipment 607, and then into the dew point meter 602 and micro-oxygen meter 605.

[0065] To fulfill the above requirements, the hydrogen discharged from the hydrogen storage and consumption module 300, as well as the hydrogen discharged from the dew point meter 602 and the micro-oxygen meter 605, are connected to the small stack 401 in the hydrogen consumption module 400. The generated current is then connected to the battery connected to the battery terminal 404 and stored.

[0066] Example 2

[0067] Specifically, this paper describes the entire working system for detecting impurities in hydrogen samples from a hydrogen production plant. Before connecting each module, it is ensured that the internal connections of each module are intact. All six modules are then connected and securely fastened.

[0068] Before conducting sample retention testing, due to the presence of gases from other batches in the gas cylinders during installation and the cylinders themselves, the entire system is first purged. The purging process primarily involves replacing the gas inside the sample bottles (sample bottle 1 206 and sample bottle 2 204). First, ensure that the sample inlet valves 1 202, 2 203, 2 205, 2 207, and 2 208 of the sample bottles (sample bottle 1 206 and sample bottle 2 204) are in the ON (open) state. Also, ensure that the hydrogen storage inlet valves 1 301 and 2 304 of the hydrogen storage and disposal cylinders (hydrogen storage and disposal cylinder 1 302 and hydrogen storage and disposal cylinder 2 305) are in the ON (open) state. In this state, the hydrogen storage outlet valves 303 and 306 of the hydrogen storage and disposal bottles (hydrogen storage bottle 1 302 and hydrogen storage bottle 2 305) are in the OFF state; the sample injection valve 506 and the second pressure reducing valve 609 of the chromatographic detection module 500 and the water / oxygen detection module 600 are in the OFF state; all other valves not mentioned are in the OFF state. The pressure regulator 108 is turned on to start the purging and replacement, and the hydrogen storage and disposal bottles (hydrogen storage bottle 1 302 and hydrogen storage bottle 2 305) will collect the replacement gas.

[0069] After purging and replacement, turn off the previously opened sample outlet valve 205, sample bottle outlet valve 1 207, sample bottle vent 208, hydrogen storage and disposal inlet valve 1 301, and hydrogen storage and disposal inlet valve 2 304. Only keep sample inlet valve 1 202 and sample inlet valve 2 203 in the ON position. Keep pressure regulator 108 open, with the pressure expected to be adjusted to 6 MPa. Fill both sample bottles (sample bottle 1 206 and sample bottle 2 204) simultaneously. The sample collection time is expected to be completed within 3 minutes.

[0070] After filling is complete, set the sample inlet valve 202 and sample inlet valve 203, as well as the pressure regulator 108, to the OFF position. Perform on-site sample testing. The pressure regulator 108 should adjust the pressure to the level required by the detection equipment in the chromatography module 500, generally not exceeding 0.4 MPa. Open the sample injection valve 506 and start the chromatography module 505 to begin relevant impurity detection. Since the chromatography module 500 operates discontinuously, the gas is in a fluctuating state. The water / oxygen detection module 600 is temporarily not performing detection. The hydrogen storage and disposal module 300 is activated to perform gas replacement within the pipeline of the water / oxygen detection module 600. With the hydrogen storage and absorption outlet valve 2 306, the first pressure reducing valve 608, the first control valve 601, the second control valve 604, the first one-way control valve 603, and the second one-way control valve 606 in the ON (open) state, the purification equipment 607 is turned on to purify the gas and perform gas replacement of the entire water / oxygen detection module 600. At the same time, the hydrogen absorption module 400 is turned on to directly absorb the small amount of hydrogen that is discharged. The generated current is connected to the battery connected to the battery terminal 404 and stored.

[0071] After the chromatographic detection module 500 completes sample detection, the sample injection valve 506 is closed. The replacement of the water / oxygen detection module 600 is paused. First, the purification equipment 607 is shut down, and then the hydrogen storage and disposal outlet valve 306, the first pressure reducing valve 608, the first control valve 601, the second control valve 604, the first one-way control valve 603, and the second one-way control valve 606 are placed in the OFF state. Water / oxygen detection begins by opening the second pressure reducing valve 609, the first control valve 601, the second control valve 604, the first one-way control valve 603, and the second one-way control valve 606 to perform water / oxygen determination. The hydrogen disposal module 400 continues to operate.

[0072] After completing the water / oxygen detection, first close the pressure regulator 108, then close the second pressure reducing valve 609. Restart the water / oxygen detection equipment replacement process, open the hydrogen storage and disposal outlet valve 306 and the first pressure reducing valve 608, and turn on the purification equipment 607 to continue the entire gas circulation. If water / oxygen detection is not performed for a short period, disconnect the water / oxygen equipment replacement process, close the hydrogen storage and disposal outlet valve 306, the first pressure reducing valve 608, control valve 601, control valve 604, the first one-way control valve 603, and the second one-way control valve 606, and finally stop the small fuel cell stack 401 from operating.

[0073] This invention provides a closed-loop system for mobile detection of fuel hydrogen quality. On one hand, it meets the detection requirements for trace impurities; on the other hand, it keeps the water / oxygen detection equipment within a protected gas atmosphere, effectively preventing the infiltration of water and oxygen from the environment, ensuring that the detection results are not interfered with by the environment, and simultaneously reducing the amount of hydrogen sample required and the detection time. It also achieves efficient utilization of the hydrogen exhaust, realizing a complete closed-loop system for fuel hydrogen quality detection.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A closed-loop system for detecting the mass movement of fuel hydrogen, characterized in that, The system includes a gas source receiving port module, a sample retention module, a hydrogen storage and consumption module, a hydrogen consumption module, a chromatographic detection module, and a water / oxygen detection module. The front of the gas source receiving port module is connected to a gas source. The rear of the gas source receiving port module is connected to the sample retention module, the hydrogen storage and consumption module, the chromatographic detection module, and the water / oxygen detection module, respectively. The rear of the sample retention module is connected to the hydrogen storage and consumption module. The rear of the hydrogen storage and consumption module is connected to the hydrogen consumption module and the water / oxygen detection module. The rear of the water / oxygen detection module is connected to the hydrogen consumption module. A gas source pressure gauge, a pressure regulator, an output pressure gauge, and a main control valve are sequentially provided between the gas source receiving port module and the sample retention module. The gas source receiving port module includes three receiving ports connected in parallel, and each of the three receiving ports is equipped with a control valve. The bottom of the chromatographic detection module is connected to the gas source receiving port module via a sample injection valve. The chromatographic detection module is equipped with a chromatographic working module, which is connected to a venting component. The chromatographic detection module is equipped with a high-purity nitrogen connection, a high-purity helium connection, a compressed air connection, and a high-purity hydrogen connection. The water / oxygen detection module is connected to the gas source receiving port module through the second pressure reducing valve, and the water / oxygen detection module is connected to the hydrogen storage and consumption module through the first pressure reducing valve. A purification device is provided between the hydrogen storage and consumption module and the first pressure reducing valve. The sample retention module includes sample retention bottle one and sample retention bottle two. Sample retention bottle one and sample retention bottle two are connected to the gas source receiving port module via quick-connect couplings. Sample retention bottle one and sample retention bottle two are respectively connected to the quick-connect couplings via sample retention inlet valve one and sample retention inlet valve two. Sample retention bottle one and sample retention bottle two are respectively connected to the rear side of sample retention bottle one and sample retention bottle two. Sample retention bottle outlet valve one and sample retention bottle outlet valve two are respectively connected to the sample retention bottle external outlet. The sample retention bottle external outlet is connected to the hydrogen storage and consumption module.

2. The closed-loop system for detecting the mass movement of fuel hydrogen according to claim 1, characterized in that, A hydrogen storage and consumption pipeline valve is provided between the hydrogen storage and consumption module and the gas source receiving port module, and a total hydrogen storage and consumption outlet valve is provided between the hydrogen storage and consumption module and the hydrogen consumption module.

3. The closed-loop system for detecting fuel hydrogen mass movement according to claim 2, characterized in that, The hydrogen storage and disposal module includes a hydrogen storage and disposal bottle one and a hydrogen storage and disposal bottle two. The hydrogen storage and disposal bottle one and the hydrogen storage and disposal bottle two are respectively connected to the external outlet of the sample retention bottle. The front side of the hydrogen storage and disposal bottle one and the hydrogen storage and disposal inlet valve two are respectively provided, and the rear side of the hydrogen storage and disposal bottle one and the hydrogen storage and disposal outlet valve two are respectively provided.

4. The closed-loop system for detecting fuel hydrogen mass movement according to claim 3, characterized in that, The hydrogen consumption module includes a small fuel cell stack, which is connected to the hydrogen storage and consumption module. The bottom of the small fuel cell stack is equipped with a drain pipe, a fan, and a battery connection terminal.

5. The closed-loop system for detecting the mass movement of fuel hydrogen according to claim 1, characterized in that, The water / oxygen detection module includes a micro-oxygen meter and a dew point meter. The front ends of the micro-oxygen meter and the dew point meter are respectively provided with a control valve one and a control valve two, and the rear ends of the micro-oxygen meter and the dew point meter are respectively provided with a first one-way control valve and a second one-way control valve.

6. The method of using the closed-loop system for detecting the mass movement of fuel hydrogen according to claim 1, characterized in that, Includes the following steps: S1, System Purge The gas in the sample retention module is replaced, the gas source receiving port module and the sample retention module are connected, the sample retention module and the hydrogen storage and disposal module are connected, the connection between the hydrogen storage and disposal module and the hydrogen disposal module is closed, the chromatographic detection module and the water / oxygen detection module are in the closed state, the gas source receiving port module is opened and purging and replacement begins, and the hydrogen storage and disposal module collects the replacement gas; S2, Sample filling After purging and replacement are completed, the outlet end of the sample retention module and the hydrogen storage and consumption module are closed, and the opening end of the sample retention module is opened for filling. S3, Sample Testing After filling is complete, close the sample retention module, open the sample injection valve for on-site sample testing, adjust the pressure to the pressure required by the chromatographic detection module, and the chromatographic detection module starts impurity detection. S4, Gas replacement in the pipeline of the water / oxygen detection module The hydrogen storage and consumption module is activated to replace the gas in the pipeline of the water / oxygen detection module. The purification equipment is turned on to purify the gas and replace the gas in the entire water / oxygen detection module. At the same time, the hydrogen consumption module is turned on to directly consume the small amount of hydrogen that is discharged. The hydrogen consumption module stores the current generated. S5, begin water / oxygen testing. After the chromatographic detection module completes the sample detection, it is turned off and water / oxygen detection begins. The pressure at the gas receiving port is adjusted to the pressure required by the water / oxygen detection module. The gas source receiving port module is connected to the water / oxygen detection module. The water / oxygen detection module performs water / oxygen measurement, and the hydrogen digestion module continues to work. S6, the gas in the water / oxygen detection module pipeline is replaced again. After completing the water / oxygen detection, shut down the gas source receiving port module, repeat S4 to perform gas replacement in the pipeline of the water / oxygen detection module again, and shut down the water / oxygen detection module when water / oxygen detection is no longer required in the short term. Finally, shut down the hydrogen storage and consumption module.

Images