Hydrogen station with compressed hydrogen in a prizing

Abstract

The present application provides a pry-mounted compressed hydrogen hydrogenation station, which is provided with a bidirectional single-way valve at a key position, and a combination of one bidirectional single-way valve and one two-way safety valve is used to replace the combination of two two-way safety valves in the prior art solution between the gas discharge pipeline, the first purge pipeline and the second purge pipeline, one bidirectional single-way valve replaces one two-way safety valve, reduces the maintenance, fault diagnosis and the problem that the leakage point is not easy to detect, and improves the safety and easy maintenance of the hydrogenation station.

Description

Technical Field

[0001] This invention relates to the field of hydrogen refueling station technology, and in particular to a skid-mounted compressed hydrogen refueling station. Background Technology

[0002] Currently, hydrogen refueling stations are equipped with many safety valves. These safety valves can release gas at critical moments to protect the pipelines and equipment in the hydrogen refueling station. However, the maintenance, fault diagnosis, and leak detection of safety valves are relatively inconvenient. Moreover, since safety valves are in a closed state for a long time, leaks in safety valves cannot be detected. In addition, due to the internal structure limitations of two-way safety valves, they are prone to cross-flow between the two ends. Summary of the Invention

[0003] In view of the above problems, the present invention is proposed to provide a skid-mounted compressed hydrogen refueling station that overcomes or at least partially solves the above problems, and can solve the problem that it is not easy to detect when the safety valve leaks, thereby improving the safety of the hydrogen refueling station.

[0004] Specifically, the present invention provides a skid-mounted compressed hydrogen refueling station, comprising:

[0005] The unloading pipeline connects the unloading column module and the compressor module;

[0006] The first purging line is connected between the nitrogen purging module and the compressor module;

[0007] The second purging line is connected between the nitrogen purging module and the hydrogen refueling module;

[0008] The two-way single-port valve has two inlets connected to the first purge line and the second purge line, respectively, and its outlet connected to the first inlet of the two-way safety valve. The second inlet of the two-way safety valve is connected to the unloading line.

[0009] Optionally, the unloading pipeline starts from one end connected to the unloading column module and sequentially passes through the first pressure sensor, the second inlet of the two-way safety valve, and the first valve to connect to the compressor module.

[0010] Optionally, the unloading pipeline is connected to the second inlet of the two-way safety valve after passing through a one-way valve. The one-way valve is used to prevent gas backflow between the second inlet of the two-way safety valve and the one-way valve.

[0011] Optionally, the first purging pipeline starts from the end connected to the nitrogen purging module and sequentially passes through the second pressure sensor, the fourth valve, the first inlet of the bidirectional single-way valve, and the second valve to connect to the compressor module.

[0012] Optionally, the second purging line starts from the end connected to the nitrogen purging module and sequentially passes through the third pressure sensor, the fifth valve, the second inlet of the bidirectional single-way valve, the bypass manifold connected to the third valve, and the sixth valve to connect to the hydrogen refueling module.

[0013] Optionally, the valve core of the bidirectional single-way valve is a steel ball that reciprocates within the valve body. A working coil is sleeved on the valve body of the bidirectional single-way valve. The working coil is connected to a Hall sensor, and the Hall sensor detects the vibration information of the steel ball through the working coil.

[0014] Optionally, the skid-mounted compressed hydrogen refueling station also includes:

[0015] Pressure sensors are used to monitor pipeline pressure and transmit pressure information;

[0016] A central controller is used to receive information transmitted by the pressure sensor and the Hall sensor, and process and generate corresponding information; the central controller generates a pressure timing diagram of the corresponding pipeline from the received information from the pressure sensor; the central controller processes the received information from the Hall sensor into a timing diagram of the vibration information of the steel ball.

[0017] Optionally, the central controller is configured to perform the following control method:

[0018] Close the outlet of the first purge pipeline and the outlet of the second purge pipeline, open the inlet of the first purge pipeline and the inlet of the second purge pipeline, and open the gas discharge column module to deliver gas to the gas discharge pipeline.

[0019] The first and second purge lines are alternately inflated, and it is determined whether the change in the vibration information of the steel ball lags behind the change in the alternating inflation.

[0020] If so, it is determined that the two-way safety valve has a leakage problem;

[0021] If not, then it is determined that the two-way safety valve does not have a gas leakage problem.

[0022] Optionally, the central controller is configured to perform the following control method:

[0023] Close the outlet of the first purge pipeline and the outlet of the second purge pipeline, open the inlet of the first purge pipeline and the inlet of the second purge pipeline, and open the gas discharge column module to deliver gas to the gas discharge pipeline.

[0024] The first and second purge lines are alternately inflated, and it is determined whether the sum of the pressure in the venting line and the pressure in the first purge line, or the sum of the pressure in the venting line and the pressure in the second purge line, exceeds the threshold of the two-way safety valve and increases in stages.

[0025] If so, it is determined that the two-way safety valve has an air leakage problem;

[0026] If not, then it is determined that the two-way safety valve does not have an air leakage problem.

[0027] Optionally, the central controller is configured to perform the following control method:

[0028] Close the outlet of the first purging pipeline and the outlet of the second purging pipeline, alternately open the inlet of the first purging pipeline and the inlet of the second purging pipeline, close the nitrogen purging module, and open the unloading column module to supply gas to the unloading pipeline.

[0029] Determine whether the first purge line and the second purge line are intermittently increased, or whether one of them is intermittently increased. If so, it is determined that the two-way safety valve has a cross-flow problem; if not, it is determined that the two-way safety valve does not have a cross-flow problem.

[0030] This invention provides a skid-mounted compressed hydrogen refueling station, which features a bidirectional single-way valve at a critical location. The combination of a bidirectional single-way valve and a two-way safety valve replaces the existing combination of two two-way safety valves between the unloading pipeline, the first purging pipeline, and the second purging pipeline. This reduces the number of two-way safety valves, improves the maintenance and fault diagnosis of safety valves in the refueling station, and addresses the difficulty in detecting leaks, thereby enhancing the safety and maintainability of the refueling station.

[0031] The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0032] The following sections will describe some specific embodiments of the invention in detail by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or portions. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0033] Figure 1 This is a schematic process diagram of a skid-mounted compressed hydrogen refueling station according to an embodiment of the present invention;

[0034] Figure 2This is a schematic structural diagram of a bidirectional single-way valve according to an embodiment of the present invention;

[0035] Figure 3 This is a flowchart for determining whether a two-way safety valve is leaking gas according to an embodiment of the present invention;

[0036] Figure 4 This is a flowchart for determining whether a two-way safety valve is leaking according to an embodiment of the present invention;

[0037] Figure 5 This is a flowchart for determining whether a two-way safety valve is leaking gas, according to an embodiment of the present invention. Detailed Implementation

[0038] The following reference Figures 1 to 2 This invention describes a skid-mounted compressed hydrogen refueling station according to an embodiment of the present invention. In this description, it should be understood that 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. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature, that is, include one or more of that feature. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. When a feature "includes or contains" one or more of the features it encompasses, unless otherwise specifically described, this indicates that other features are not excluded and may be further included.

[0039] Unless otherwise expressly specified and limited, the terms "set up," "install," "connect," "link," "fix," and "couple" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art should be able to understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0040] Furthermore, in the description of this embodiment, "above" or "below" the second feature can include direct contact between the first and second features, or it can include contact between the first and second features through another feature between them. That is, in the description of this embodiment, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "below" of the second feature can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] In the description of this embodiment, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0042] Figure 1 This is a schematic process diagram of a skid-mounted compressed hydrogen refueling station according to an embodiment of the present invention, such as... Figure 1 As shown, and refer to Figure 2 This invention provides a skid-mounted compressed hydrogen refueling station. A first purge pipeline and a second purge pipeline are connected via a pipeline connected to a bidirectional single-way valve 45. The two inlets of the bidirectional single-way valve 45 are respectively connected to the first purge pipeline and the second purge pipeline. The outlet of the bidirectional single-way valve 45 is connected to one inlet of a two-way safety valve 49. The other inlet of the two-way safety valve 49 is connected to the unloading pipeline, ensuring that these pipelines can be depressurized through the two-way safety valve 49 in critical moments to ensure the safety of the hydrogen refueling station.

[0043] The existing technical solution involves venting gas by using a combination of two two-way safety valves between the unloading pipeline, the first purging pipeline, and the second purging pipeline. The first inlet of the first two-way safety valve and the second two-way safety valve are connected to the unloading pipeline via a pipeline, the second inlet of the first two-way safety valve is connected to the first purging pipeline via a pipeline, and the second inlet of the second two-way safety valve is connected to the second purging pipeline via a pipeline. The two two-way safety valves are used to protect the safety of the hydrogen refueling station.

[0044] Compared with existing technical solutions, the technical solution of the present invention replaces the combination of two two-way safety valves with a combination of a two-way safety valve 49 and a two-way single-way valve 45, reducing the number of two-way safety valves, lowering the difficulty of maintenance and fault diagnosis of two-way safety valves, reducing the problem of not being able to detect leaks, and improving the safety and maintainability of hydrogen refueling stations.

[0045] In some embodiments of the present invention, a skid-mounted compressed hydrogen refueling station includes:

[0046] The gas discharge pipeline is connected between the gas discharge column module 41 and the compressor module 43;

[0047] The first purging line is connected between the nitrogen purging module 42 and the compressor module 43;

[0048] The second purging line is connected between the nitrogen purging module 42 and the hydrogen refueling module 54;

[0049] The bidirectional single-way valve 45 has two inlets connected to the first purge line and the second purge line, respectively, and its outlet connected to the first inlet of the two-way safety valve 49. The second inlet of the two-way safety valve 49 is connected to the unloading line.

[0050] The unloading pipeline connects the unloading column module 41 and the compressor module 43. A pressure sensor consisting of a pressure gauge 47 and a pressure transmitter 46, and a first valve 61 are connected to the unloading pipeline. The first purging pipeline connects the nitrogen purging module and the compressor module. A pressure sensor consisting of a pressure gauge 7 and a pressure transmitter 8, and a fourth valve 11b are connected to the inlet of the first purging pipeline. A second valve 13b is connected to the outlet of the first purging pipeline. The second purging pipeline connects the nitrogen purging module 42 and the hydrogen refueling module 54. A pressure gauge 91 and a pressure transmitter are connected to the inlet of the second purging pipeline. The system includes a pressure sensor composed of device 9 and a fifth valve 11a. The outlet of the second purge line is connected to a sixth valve 13c and a third valve 13a connected to the bypass manifold. The two inlets of the bidirectional single-way valve 45 are respectively connected to the first purge line and the second purge line. The outlet of the bidirectional single-way valve 45 is connected to the first inlet of the two-way safety valve 49. The second inlet of the two-way safety valve 49 is connected to the unloading line. The combination of a two-way safety valve 49 and a bidirectional single-way valve 45 is used to depressurize the unloading line, the first purge line and the second purge line to ensure the safety of the hydrogen refueling station.

[0051] This invention replaces the combination of two two-way safety valves in the existing solution with a combination of a two-way safety valve 49 and a two-way single-way valve 45. Replacing a two-way safety valve with a two-way single-way valve 45 reduces the problems of air leakage and cross-flow of the two-way safety valve. The leakage problem of the two-way single-way valve is less than that of the two-way safety valve. Moreover, the two-way safety valve is a normally closed valve, so it is not easy to detect when a leak occurs.

[0052] In some embodiments of the present invention, the unloading pipeline starts from one end connected to the unloading column module 41 and sequentially passes through the first pressure sensor, the second inlet of the two-way safety valve 49, and the first valve 61 to connect to the compressor module 43.

[0053] The gas discharge pipeline starts from one end connected to the gas discharge column module 41 and sequentially passes through the first pressure sensor, the second inlet of the two-way safety valve 49, and the first valve 61 to connect to the compressor module 43. The second inlet of the two-way safety valve 49 is connected between the first pressure sensor and the first valve 61. The first pressure sensor includes a pressure gauge 47 and a pressure transmitter 46.

[0054] In some embodiments of the present invention, the gas discharge pipeline is connected to the second inlet of the two-way safety valve 49 via a one-way valve 48, and the one-way valve 48 is used to prevent gas backflow between the second inlet of the two-way safety valve 49 and the one-way valve 48.

[0055] A one-way valve 48 is installed on the pipeline connecting the unloading pipeline to the second inlet of the two-way safety valve 49. The direction of the one-way valve 48 is from the unloading pipeline to the second inlet of the two-way safety valve 49. This prevents the gas in the first and second purge pipelines from flowing into the unloading pipeline when the two-way safety valve 49 leaks gas. At the same time, it prevents the gas flowing through the one-way valve 48 in the unloading pipeline from re-entering the unloading pipeline, thus avoiding the mixing of hydrogen with the gas in the purge pipeline.

[0056] In some embodiments of the present invention, the first purging pipeline starts from one end connected to the nitrogen purging module 42 and sequentially passes through the second pressure sensor, the fourth valve 11b, the first inlet of the bidirectional one-way valve 45, and the second valve 13b to connect to the compressor module 43.

[0057] The first purging line starts from one end connected to the nitrogen purging module 42 and sequentially passes through the second pressure sensor, the fourth valve 11b, the first inlet of the bidirectional single-way valve 45, and the second valve 13b to connect to the compressor module 43. The second pressure sensor includes a pressure gauge 7 and a pressure transmitter 8. The first inlet of the bidirectional single-way valve 45 is connected between the fourth valve 11b and the second valve 13b. The bidirectional single-way valve can be controlled by opening or closing the fourth valve 11b and the second valve 13b.

[0058] In some embodiments of the present invention, the second purging pipeline starts from one end connected to the nitrogen purging module 42 and sequentially passes through the third pressure sensor, the fifth valve 11a, the second inlet of the bidirectional single-way valve 45, the bypass manifold connected to the third valve 13a, and the sixth valve 13c and connects to the hydrogen refueling module 54.

[0059] The second purging line starts from the end connected to the nitrogen purging module 42 and passes sequentially through the third pressure sensor, the fifth valve 11a, the second inlet of the bidirectional single-way valve 45, the bypass manifold connected to the third valve 13a, and the sixth valve 13c, which connects to the hydrogen refueling module 54. The third pressure sensor includes a pressure gauge 91 and a pressure transmitter 9. The second inlet of the bidirectional single-way valve 45 is connected between the fifth valve 11a and the third valve 13a, and also between the fifth valve 11a and the sixth valve 13c. The second inlet of the bidirectional single-way valve 45 can be regulated by controlling these valves.

[0060] In some embodiments of the present invention, the valve core of the bidirectional single-way valve 45 is a steel ball 52 that reciprocates within the valve body 51. A working coil is sleeved on the valve body 51 of the bidirectional single-way valve 45. The working coil is connected to a Hall sensor, and the Hall sensor detects the vibration information of the steel ball 52 through the working coil.

[0061] A reciprocating steel ball 52 is placed inside the valve body 51 of the bidirectional single-way valve 45. A working coil is sleeved on the valve body 51 of the bidirectional single-way valve 45. The working coil is connected to a Hall sensor. The Hall sensor detects the vibration information of the steel ball 52 through the vibration of the working coil, and then transmits the vibration information of the steel ball 52 to the central controller to generate a timing diagram of the vibration information of the steel ball 52, so as to make a judgment on the timing diagram of the vibration information of the steel ball 52 later.

[0062] In some embodiments of the present invention, a skid-mounted compressed hydrogen refueling station further includes:

[0063] Pressure sensors are used to monitor pipeline pressure and transmit pressure information;

[0064] A central controller is used to receive information transmitted by the pressure sensor and the Hall sensor, and process and generate corresponding information; the central controller generates a pressure timing diagram of the corresponding pipeline from the received information from the pressure sensor; the central controller processes the received information from the Hall sensor into a timing diagram of steel ball vibration information.

[0065] The pressure sensor includes a pressure gauge for real-time pressure monitoring and a pressure transmitter for transmitting pressure information. After the Hall sensor detects the vibration information of the steel ball 52, it transmits the vibration information of the steel ball 52 to the central controller in real time. The central processor processes the vibration information of the steel ball 52 into a time sequence diagram of the vibration information of the steel ball 52. The information transmission and processing speed is very fast, and the transmission and processing time can be ignored when comparing the time sequence diagram.

[0066] The pressure information of the unloading pipeline is monitored by pressure sensors on the unloading pipeline, the pressure information of the pipeline is monitored by pressure sensors on the first purging pipeline, and the pressure information of the pipeline is monitored by pressure sensors on the second purging pipeline. This monitored pressure information is transmitted to the central controller in real time, and a time-series graph of the pressure value of each pipeline equipped with pressure sensors can be displayed in real time for monitoring personnel to observe. When an abnormality occurs, on-site personnel can be notified in a timely manner for investigation, thereby improving the safety of the hydrogen refueling station.

[0067] In some embodiments of the present invention, the central controller is configured to perform the following control method:

[0068] S101: Close the outlet of the first purge pipeline and the outlet of the second purge pipeline, open the inlet of the first purge pipeline and the inlet of the second purge pipeline, and open the gas discharge column module 41 to deliver gas to the gas discharge pipeline.

[0069] S102: Alternately purge the first purge line and the second purge line with air.

[0070] S103: And determine whether the change in the vibration information of the steel ball 52 lags behind the change in the alternating inflation.

[0071] S104: If so, it is determined that the two-way safety valve 49 has a leakage problem;

[0072] S105: If not, then it is determined that the two-way safety valve 49 does not have a gas leakage problem.

[0073] This embodiment relates to a diagnostic method for whether a two-way safety valve has a gas leakage problem. First, the second valve 13b at the outlet of the first purge line, the sixth valve 13c at the outlet of the second purge line, and the third valve 13a on the bypass manifold connecting to the second purge line need to be closed. The fourth valve 11b at the inlet of the first purge line and the fifth valve 11a at the inlet of the second purge line are opened. The gas discharge column module 41 is opened to supply gas to the gas discharge line. The gas in the gas discharge line flows through the one-way valve 48 to the second inlet of the two-way safety valve 49. Then, the first and second purge lines are alternately purged with gas, with the nitrogen purge module 42 alternately purging these two lines. The method then determines whether the gas leakage is present. If the change in the vibration information of the broken steel ball 52 lags behind the change in alternating inflation, then it is determined that there is a cross-flow problem in the two-way safety valve 49; otherwise, it is determined that there is no cross-flow problem in the two-way safety valve 49. The central controller processes the vibration information of the steel ball 52 into a timing diagram of the vibration information of the steel ball 52, and at the same time obtains the timing diagram of the pipeline pressure when the first purge pipeline and the second purge pipeline are alternately inflated. Based on these timing diagrams, if the change in the vibration information of the steel ball 52 lags behind the change in alternating inflation, then it is determined that there is a cross-flow problem in the two-way safety valve 49. When the two-way safety valve 49 is working normally, the timing diagram of the vibration information of the steel ball and the timing diagram of alternating inflation change synchronously.

[0074] In some embodiments of the present invention, the central controller is configured to perform the following control method:

[0075] S201: Close the outlet of the first purge pipeline and the outlet of the second purge pipeline, open the inlet of the first purge pipeline and the inlet of the second purge pipeline, and open the gas discharge column module 41 to deliver gas to the gas discharge pipeline.

[0076] S202: Alternately purge the first purge line and the second purge line with air.

[0077] S203: Determine whether the sum of the pressure in the unloading pipeline and the pressure in the first purging pipeline, or the sum of the pressure in the unloading pipeline and the pressure in the second purging pipeline, exceeds the threshold of the two-way safety valve 49 and increases in stages.

[0078] S204: If so, it is determined that the two-way safety valve 49 has a leakage problem;

[0079] S205: If not, then it is determined that the two-way safety valve 49 does not have a leakage problem.

[0080] This embodiment relates to a diagnostic method for whether a two-way safety valve is leaking. First, the second valve 13b at the outlet of the first purge line, the sixth valve 13c at the outlet of the second purge line, and the third valve 13a on the bypass manifold connecting to the second purge line are closed. Then, the fourth valve 11b at the inlet of the first purge line and the fifth valve 11a at the inlet of the second purge line are opened. The gas discharge module 42 is then opened to supply gas to the gas discharge line. The gas in the gas discharge line flows through the one-way valve 48 to the second inlet of the two-way safety valve 49. Next, the first and second purge lines are alternately purged with gas. The nitrogen purge module 42 alternately purges these two lines, and the process is controlled by the central controller. The pressure time sequence diagrams of the unloading pipeline and the first purging pipeline are summed and analyzed, as are the pressure time sequence diagrams of the unloading pipeline and the second purging pipeline. This analysis determines whether the sum of pressures at corresponding stages exceeds the threshold of the two-way safety valve 49 and whether it increases in stages. If the sum of pressures exceeds the threshold of the two-way safety valve 49 and increases in stages, it can be determined that the two-way safety valve 49 has a leakage problem. If the sum of pressures exceeds the threshold of the two-way safety valve 49 but does not increase in stages, it can be determined that the two-way safety valve 49 does not have a cross-flow problem. If the sum of pressures does not exceed the threshold of the two-way safety valve 49, the time sequence diagrams at these locations are not used as reference data.

[0081] When the two-way safety valve 49 is functioning normally, its threshold value is fixed. When the sum of the pressures at both ends of the two-way safety valve 49 exceeds its threshold value, the two-way safety valve 49 opens to release air. When detecting air leakage in the two-way safety valve 49, the sum of the pressure information from the venting pipeline and the pressure information from the first purging pipeline is the actual threshold value, or the sum of the pressure information from the venting pipeline and the pressure information from the second purging pipeline is the actual threshold value. Because the first and second purging pipelines are alternately filled with air, only one of the two actual threshold values ​​exists at any given time, and it represents the current threshold value of the two-way safety valve 49. If this actual threshold value increases in stages, it indicates that the two-way safety valve 49 has a leakage problem.

[0082] In some embodiments of the present invention, the central controller is configured to perform the following control method:

[0083] S301: Close the outlet of the first purging pipeline and the outlet of the second purging pipeline, alternately open the inlet of the first purging pipeline and the inlet of the second purging pipeline, close the nitrogen purging module 42, and open the unloading column module 41 to deliver gas to the unloading pipeline.

[0084] S302: Determine whether the first purge line and the second purge line are intermittently increased, or whether one of them is intermittently increased.

[0085] S303: If so, it is determined that the two-way safety valve 49 has a gas leakage problem;

[0086] S304: If not, then it is determined that the two-way safety valve 49 does not have a gas leakage problem.

[0087] This embodiment relates to a diagnostic method for whether a two-way safety valve 49 has a cross-flow problem. The method allows for direct visual observation of pipeline changes to determine if the two-way safety valve 49 has a cross-flow problem. First, the second valve 13b at the outlet of the first purge pipeline, the sixth valve 13c at the outlet of the second purge pipeline, and the third valve 13a on the bypass manifold connecting to the second purge pipeline are closed. Then, the fourth valve 11b at the inlet of the first purge pipeline and the fifth valve 11a at the inlet of the second purge pipeline are alternately opened. The nitrogen purge module 42 is closed, and the gas discharge column module 41 is opened to supply gas to the gas discharge pipeline. It is then determined whether the first and second purge pipelines intermittently increase in pressure, or if one of them intermittently increases in pressure. If the pipeline increases in pressure, the two-way safety valve 49 has a cross-flow problem; if the pipeline does not increase in pressure, the two-way safety valve 49 does not have a cross-flow problem. This method allows for direct visual observation of pipeline changes without the need for instrumental data detection, making it more intuitive. However, this method cannot quickly detect minor leaks or cross-flow problems in the two-way safety valve 49.

[0088] The existing unloading pipeline, first purging pipeline, and second purging pipeline all use two two-way safety valves. While these valves can effectively combine the unloading pipeline with a nitrogen purging pipeline for safe venting control, they are less convenient for maintenance, fault diagnosis, and leak detection. Furthermore, two-way safety valves have more potential leaks than single-way safety valves, and as normally closed valves, leaks are often difficult to detect.

[0089] In addition, due to the limitations of the internal structure of the two-way safety valve, cross-contamination is prone to occur. For example, high-pressure hydrogen can enter the nitrogen pipeline from the unloading pipeline through the two-way safety valve, or high-pressure nitrogen can enter the hydrogen pipeline from the first or second purging pipeline through the two-way safety valve, which will reduce the purity of the gas.

[0090] Replacing the combination of two two-way safety valves with a combination of one two-way safety valve and one two-way single-way valve eliminates the need for one two-way safety valve, thus reducing the difficulty of inspection and maintenance and reducing the number of potential leaks.

[0091] Pressure control and detection methods are added to the unloading pipeline, and the pressure data of the unloading pipeline, the first purging pipeline, and the second purging pipeline are transmitted to the central controller to automatically determine whether the two-way safety valve 49 has a leak. The specific technical means are:

[0092] The bidirectional single-way valve 45 contains a reciprocating steel ball 52. A working coil is installed on the valve body 51 of the bidirectional single-way valve 45 and connected to a Hall sensor. If the steel ball 52 oscillates back and forth within the valve body 51 of the bidirectional single-way valve 45, the Hall sensor will detect the oscillation information and transmit it to the central controller.

[0093] The first purging line is a line connecting the nitrogen purging module 42 and the compressor module 43, and the second purging line is a line connecting the nitrogen purging module 42 and the hydrogen refueling module 54.

[0094] When the gas discharge column module 41 delivers gas to the gas discharge pipeline, the third valve 13a, the fourth valve 13b, and the sixth valve 13c are closed, and the fifth valve 11a and the fourth valve 11b are opened, alternately charging the first purge pipeline and the second purge pipeline. If the change in the oscillation information of the steel ball 52 in the bidirectional single-way valve 45 lags behind the change in the alternating charging, it is determined that there is a gas leakage problem in the two-way safety valve 49; if the threshold of the two-way safety valve 49 increases in stages, it is determined that there is a gas leakage problem in the two-way safety valve 49.

[0095] When the gas discharge column module 41 delivers gas to the gas discharge pipeline, the third valve 13a, the fourth valve 13b, and the sixth valve 13c are closed, the fifth valve 11a and the fourth valve 11b are opened alternately, and the nitrogen purging module 42 is closed. If the intermittent between the first purging pipeline and the second purging pipeline or between the two is increased, then the two-way safety valve 49 has a gas leakage problem.

[0096] Therefore, those skilled in the art should recognize that although numerous exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Thus, the scope of the present invention should be understood and construed as covering all such other variations or modifications.

Claims

1. A skid-mounted compressed hydrogen refueling station, characterized in that, include: The unloading pipeline connects the unloading column module and the compressor module; The first purging line is connected between the nitrogen purging module and the compressor module; The second purging line is connected between the nitrogen purging module and the hydrogen refueling module; A bidirectional single-way valve has two inlets connected to the first purge line and the second purge line, respectively, and its outlet connected to the first inlet of a two-way safety valve. The second inlet of the two-way safety valve is connected to the venting line. The valve core of the bidirectional single-way valve is a steel ball that reciprocates within the valve body. A working coil is sleeved on the valve body of the bidirectional single-way valve. The working coil is connected to a Hall sensor, and the Hall sensor detects the vibration information of the steel ball through the working coil. Pressure sensors are used to monitor pipeline pressure and transmit pressure information; The central controller is configured to execute the following control methods: Based on whether the change in the vibration information of the steel ball lags behind the change in the airflow alternately filled into the first purge pipe and the second purge pipe, it can be determined whether there is a cross-flow problem in the two-way safety valve; Alternatively, when alternately filling the first purge line and the second purge line, determine whether the two-way safety valve has a leakage problem based on whether the sum of the pressure of the unloading line and the pressure of the first purge line, or the sum of the pressure of the unloading line and the pressure of the second purge line, exceeds the threshold of the two-way safety valve and increases in stages. Alternatively, determine whether the first purge line and the second purge line intermittently increase in pressure, or whether one of them intermittently increases in pressure, to determine whether the two-way safety valve has a cross-flow problem; The central controller is used to receive information transmitted by the pressure sensor and the Hall sensor, and process and generate corresponding information; the central controller generates a pressure timing diagram of the corresponding pipeline from the information received from the pressure sensor; the central controller processes the information received from the Hall sensor into a timing diagram of the vibration information of the steel ball.

2. The hydrogen refueling station according to claim 1, characterized in that, The unloading pipeline starts from one end connected to the unloading column module and sequentially passes through the first pressure sensor, the second inlet of the two-way safety valve, and the first valve to connect to the compressor module.

3. The hydrogen refueling station according to claim 1, characterized in that, The gas discharge pipeline is connected to the second inlet of the two-way safety valve after passing through a one-way valve. The one-way valve is used to prevent gas backflow between the second inlet of the two-way safety valve and the one-way valve.

4. The hydrogen refueling station according to claim 1, characterized in that, The first purging pipeline starts from the end connected to the nitrogen purging module and sequentially passes through the second pressure sensor, the fourth valve, the first inlet of the bidirectional single-way valve, and the second valve to connect to the compressor module.

5. The hydrogen refueling station according to claim 1, characterized in that, The second purging line starts from the end connected to the nitrogen purging module and sequentially passes through the third pressure sensor, the fifth valve, the second inlet of the bidirectional single-way valve, the bypass manifold connected to the third valve, and the sixth valve, connecting to the hydrogen refueling module.

6. The hydrogen refueling station according to claim 1, characterized in that, Based on whether the change in the vibration information of the steel ball lags behind the change in the airflow alternately filling the first and second purge lines, it is determined whether there is a cross-flow problem in the two-way safety valve, including: The central controller performs the following control method: Close the outlet of the first purge pipeline and the outlet of the second purge pipeline, open the inlet of the first purge pipeline and the inlet of the second purge pipeline, and open the gas discharge column module to deliver gas to the gas discharge pipeline. The first and second purge lines are alternately inflated, and the condition of the steel ball is determined. Does the change in vibration information lag behind the change in alternating inflation? If so, it is determined that the two-way safety valve has a leakage problem; If not, then it is determined that the two-way safety valve does not have a gas leakage problem.

7. The hydrogen refueling station according to claim 1, characterized in that, When alternately filling the first purge line and the second purge line, the system determines whether the two-way safety valve has a leakage problem based on whether the sum of the pressure of the unloading line and the pressure of the first purge line, or the sum of the pressure of the unloading line and the pressure of the second purge line, exceeds the threshold of the two-way safety valve and increases in stages. This includes: The central controller performs the following control method: Close the outlet of the first purge pipeline and the outlet of the second purge pipeline, open the inlet of the first purge pipeline and the inlet of the second purge pipeline, and open the gas discharge column module to deliver gas to the gas discharge pipeline. Alternately purge the first and second purge lines with air, and determine the sum of the pressure in the venting line and the pressure in the first purge line, or... The sum of the pressure in the unloading pipeline and the pressure in the second purging pipeline Whether the threshold of the two-way safety valve is exceeded and increases in stages, If so, it is determined that the two-way safety valve has an air leakage problem; If not, then it is determined that the two-way safety valve does not have an air leakage problem.

8. The hydrogen refueling station according to claim 1, characterized in that, Determining whether the first purge line and the second purge line intermittently increase in pressure, or whether one of them intermittently increases in pressure, to determine if the two-way safety valve has a leakage problem includes: The central controller performs the following control method: Close the outlet of the first purging pipeline and the outlet of the second purging pipeline, alternately open the inlet of the first purging pipeline and the inlet of the second purging pipeline, close the nitrogen purging module, and open the unloading column module to supply gas to the unloading pipeline. Determine whether the first purge line and the second purge line are intermittently increased, or whether one of them is intermittently increased. If so, it is determined that the two-way safety valve has a leakage problem; If not, then it is determined that the two-way safety valve does not have a gas leakage problem.

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