A marine hydrogen fuel double-wall delivery control system

Abstract

The application discloses a marine hydrogen fuel double-wall conveying control system and relates to the technical field of hydrogen fuel ship safety conveying. The marine hydrogen fuel double-wall conveying control system comprises a double-wall pipe pipeline, a purging unit, a sensing and detecting unit and a control unit. The control unit calculates the interlayer ice blocking critical time according to the real-time collected dew point, flow and pressure of the purging gas, and can selectively introduce a pre-calibrated condensation adhesion coefficient to correct the icing rate, so as to reduce false alarms. When the predicted time is lower than the safety threshold at each level, the dryers are switched, the purging flow is increased or the fuel supply is urgently cut off. The application fully considers the characteristics of the interlayer support device preferentially icing, changes the ice blocking risk from post-discovery to accurate prediction in advance, and provides reliable guarantee for the safe operation of the marine hydrogen fuel double-wall pipe.

Description

Technical Field

[0001] This application relates to the field of safe transport technology for hydrogen fuel ships, and more specifically, to a double-walled transport control system for marine hydrogen fuel. Background Technology

[0002] In hydrogen-fueled ships, a double-walled tube structure is commonly used to safely transport cryogenic liquid hydrogen. The inner tube is used to transport hydrogen fuel, and an annular sealed interlayer is formed between the outer and inner tubes. To prevent the inner and outer tubes from sticking together or becoming eccentric, support devices are usually installed at intervals along the length of the tubes in the interlayer to maintain a fixed distance between the inner and outer tubes, thus forming a stable and continuous annular interlayer cavity. At the same time, to prevent hydrogen from accumulating in the interlayer after leakage and reaching the explosion limit, inert gases such as nitrogen are continuously purged into the interlayer. This serves two purposes: diluting and discharging any leaked hydrogen, and providing insulation for the cryogenic pipeline.

[0003] When transporting liquid hydrogen, the temperature of the outer wall of the inner tube can drop as low as -253°C. If the dryness of the nitrogen used for purging is insufficient, i.e., the dew point temperature is too high, the trace amounts of water vapor contained in the nitrogen will instantly sublimate upon contact with the extremely cold outer wall of the inner tube and the support device within the interlayer. The gaseous state will directly transform into solid ice crystals, which will then adhere to the surface. Because the support device extends deep into the interlayer flow channel, its surface becomes a cold surface where water vapor preferentially condenses. Furthermore, its complex geometry and numerous edges and corners make it easier for ice crystals to adhere and grow rapidly at this location. Over time, the ice layer... The simultaneous thickening of the surface of the support device and the outer wall of the inner tube may first form a local blockage at the support device, increasing the flow resistance of the interlayer, and then gradually developing into a complete ice blockage of the entire annular cross section. Once the ice blockage is formed, the interlayer ventilation will fail. If hydrogen leakage occurs at this time, the combustible gas will not be diluted and discharged, and will accumulate in the interlayer to form an explosive mixture, seriously threatening the safety of the ship. At the same time, the large amount of ice attached to the support device may also cause local stress concentration, affecting the structural integrity of the support device itself and the positioning accuracy of the inner and outer tubes.

[0004] Therefore, it is necessary for the inventors to design a new marine hydrogen fuel double-wall delivery control system to overcome the above problems. Summary of the Invention

[0005] The main objective of this application is to provide a marine hydrogen fuel double-wall delivery control system that can calculate the estimated time of ice blockage formation, thereby avoiding risks and issuing timely warnings to prevent complete ice blockage at the support device and the resulting safety hazards.

[0006] To achieve the above objectives, this application provides a marine hydrogen fuel double-wall delivery control system, including... A double-walled pipe system, comprising an inner pipe and an outer pipe, wherein an annular interlayer is formed between the inner pipe and the outer pipe, and a support device for maintaining the distance between the inner pipe and the outer pipe is provided within the annular interlayer; A purging unit is used to supply purging inert gas into the annular interlayer; A sensing and detection unit is used to collect the dew point temperature, flow rate, and pressure of the purging inert gas in real time. The control unit is configured to calculate the water vapor mass concentration in the purging inert gas based on the dew point temperature, and to calculate the critical ice blockage time required for the annular interlayer to be completely blocked by ice based on the water vapor mass concentration, the flow rate, and the geometric parameters of the annular interlayer. The control unit is set with a preset safety threshold, and when the critical ice blockage time is lower than the preset safety threshold, it triggers an early warning or interlock protection action.

[0007] Preferably, the formula for the control unit to calculate the critical time t of ice blockage is: ; Wherein: ρ is the ice density, A is the annular cross-sectional area of ​​the annular interlayer, L is the length of the preset blockage characteristic pipe section, Q is the volumetric flow rate of the purging inert gas, and C is the water vapor mass concentration.

[0008] Preferably, the control unit also stores the condensation adhesion coefficient η obtained through previous experimental calibration, and modifies the formula for calculating the critical time of ice blockage as follows: ; Wherein, η is the condensation adhesion coefficient, and 0<η≤1, which represents the proportion of water vapor contained in the purging inert gas that actually participates in the adhesion and icing on the extremely cold wall surface inside the annular interlayer and the support device. This coefficient comprehensively corrects the reduction in icing caused by water vapor supersaturation escape and ice crystals being carried out of the annular interlayer by the airflow.

[0009] Preferably, the coagulation adhesion coefficient η ranges from 0.55 to 0.75, and the control unit uses the lower limit of this range according to the conservative principle.

[0010] Preferably, the control unit is further configured to calculate the maximum permissible water vapor mass concentration based on the formula for the ice blockage critical time according to the preset minimum permissible safe operating time, and to convert the concentration into the maximum permissible dew point temperature, which is set as the absolute control red line. When the dew point temperature measured by the sensing unit exceeds the red line, the control unit forcibly executes an intervention action, which includes at least issuing an alarm or automatically switching the dryer.

[0011] Preferably, the preset security threshold includes at least a first-level time threshold and a second-level time threshold, and the first-level time threshold is greater than the second-level time threshold; When the critical time for ice blockage is lower than the first-level time threshold, the control unit triggers a prompt signal for dryer regeneration or switching. When the ice blockage critical time is lower than the second-level time threshold, the control unit triggers an emergency cut-off command for the hydrogen fuel supply.

[0012] Preferably, the sensing and detection unit includes a dew point sensor, a mass flow meter, and a pressure transmitter, all of which are installed on the main gas supply pipe for the purging inert gas. The sensing and detection unit also includes at least one temperature sensor, which is attached to the surface of the support device to obtain the local wall temperature of the preferential freezing area.

[0013] Preferably, the system further includes an execution unit electrically connected to the control unit, the execution unit comprising a dryer switching valve group, a purge flow regulating valve, and a hydrogen fuel supply emergency shut-off valve.

[0014] Preferably, the support device includes a plurality of support parts arranged in a ring array, the cross-sectional shape of the support parts is serpentine, and the inward ends of all the support parts are fixedly connected to each other and sleeved on the outer wall of the inner tube.

[0015] The present invention provides a marine hydrogen fuel double-wall delivery control system, which, compared with the prior art, has the following advantages: By conservatively covering the area where the support device is located within the preset blockage characteristic pipe segment length L, the complex geometry of the support device in the interlayer and its preferential icing characteristics are fully considered. This allows the prediction model to cover the risk of local premature blockage and avoid premature failure of interlayer ventilation due to ice blockage at the support device. By introducing a pre-calibrated condensation adhesion coefficient η, the ideal assumption that all water vapor condenses and adheres in situ is corrected, making the prediction result of the ice blockage critical time closer to physical reality. This effectively reduces the problem of frequent false alarms caused by the short prediction of the ideal model. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application.

[0017] In the attached diagram: Figure 1 This is a schematic diagram of the double-walled pipe system in this invention; Figure 2 This is a schematic diagram of the support device in this invention; Figure 3 This is a schematic diagram of the entire invention.

[0018] in: 1. Double-walled pipe system; 11. Inner pipe; 12. Outer pipe; 13. Annular interlayer; 2. Purge unit; 21. Nitrogen cylinder; 22. Dryer assembly; 23. Main gas supply pipe; 24. Exhaust port; 3. Sensing and detection unit; 31. Dew point sensor; 32. Mass flow meter; 33. Pressure transmitter; 34. Temperature sensor; 4. Control unit; 5. Actuation unit; 51. Dryer switching valve group; 52. Purge flow regulating valve; 53. Hydrogen fuel supply emergency shut-off valve; 6. Support device; 61. Support part; 62. Connecting part; 63. Connecting ring. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0020] It should be noted that the terms "first," "second," etc., used in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be used interchangeably where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0021] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0022] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0023] In addition, the term "multiple" should mean two or more.

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] Example 1, as Figure 1 and Figure 3 As shown in the figure, this embodiment provides a marine hydrogen fuel double-wall delivery control system, including a double-wall pipeline 1, an inert gas purging unit 2, a sensing and detection unit 3, a control unit 4, and an execution unit 5.

[0026] The double-walled pipe 1 consists of an inner pipe 11 and an outer pipe 12. The inner pipe 11 is used to transport liquid hydrogen at -253°C and is usually made of low-temperature resistant stainless steel or aluminum alloy. The outer pipe 12 is fitted outside the inner pipe 11, forming an annular sandwich 13 between them. Multiple support devices 6 are spaced apart along the length of the pipe in the annular sandwich 13. The support devices 6 are fixedly installed between the outer wall of the inner pipe 11 and the inner wall of the outer pipe 12 to maintain the concentric distance between the inner pipe 11 and the outer pipe 12 and to prevent the inner pipe 11 from shifting due to gravity, vibration or thermal expansion and contraction. The corners and geometrically irregular parts of the support devices 6 are prone to becoming preferred attachment sites for water vapor to sublimate into ice. To monitor the icing state in this area, a temperature sensor 34 can be attached to the surface of at least one support device 6 to obtain the representative temperature of the local cold surface.

[0027] like Figure 2As shown, the support device 6 specifically includes several support parts 61 arranged in a ring array. The cross-sectional shape of the support parts 61 is a reciprocating serpentine shape, with gaps at each bend. Both the bends and gaps are arc-shaped and coaxially arranged with the inner tube 11. Each end of the support part 61 is provided with a connecting part 62. A connecting ring 63 is fitted on the outer wall of the inner tube 11. All the connecting parts 62 of the support parts 61 facing the inner tube 11 are fixedly connected to the connecting ring 63. The connecting parts 62 of the support parts 61 facing the outer tube 12 are all connected to... On the inner wall of the outer tube 12, this design is intended to extend the path of heat conduction from the inner tube 11 to the outer tube 12 as much as possible, while ensuring the support effect on the inner tube 11. In addition, the contact area between the purging inert gas supplied by the purging unit 2 and the support part 61 is also large, which can exchange heat with the support part 61, thereby reducing the heat conduction from the inner tube 11 to the outer tube 12 through the support part 61. However, this design also makes it easier for ice to adhere to the gaps in the support part 61, or even be blocked by ice, affecting normal use.

[0028] like Figure 3 As shown, the purging unit 2 includes a nitrogen cylinder 21, a dryer assembly 22, a main gas supply pipe 23, and an exhaust port 24. The dryer assembly 22 adopts a dual-tower regenerable dryer, which is filled with adsorbent materials such as molecular sieves or activated alumina. The two towers are used in one and standby in the other. Online regeneration can be achieved by switching the towers through valves without shutting down the system. After the nitrogen in the nitrogen cylinder 21 is deeply dried by the dryer assembly 22, the dew point temperature is usually controlled below -60°C to -70°C. Then, the nitrogen is sent into the annular jacket 13 through the main gas supply pipe 23. It flows along the annular jacket 13 and carries any hydrogen or water vapor that may leak. Finally, it is discharged outside the ship from the exhaust port 24, forming a continuous purging airflow.

[0029] The sensing and detection unit 3 includes a dew point sensor 31, a mass flow meter 32, a pressure transmitter 33, and a temperature sensor 34. The dew point sensor 31 is a high-precision online dew point meter of capacitive or cold mirror type, the mass flow meter 32 is a Coriolis or thermal mass flow meter, and the pressure transmitter 33 is an absolute pressure transmitter. All three are installed on the gas supply main pipe 23 and are located after the dryer group 22 and before the inlet of the annular jacket 13. They are used to measure the dew point temperature, volumetric flow rate, and absolute pressure of the purging inert gas before entering the jacket in real time. The temperature sensor 34 is installed at a representative position on the outer wall of the inner pipe 11. Preferably, it can be attached to the surface of the support device 6 to monitor the temperature of the cold wall surface most prone to preferential icing. The signals from all sensors are transmitted to the control unit 4 in real time via hardwire or bus.

[0030] The control unit 4 is a marine PLC safety controller or a dedicated safety instrument system controller, equipped with digital and analog input / output interfaces and sufficient computing power. Its internal memory contains the anti-icing prediction algorithm and control logic. The control unit 4 receives various signals from the sensing and detection unit 3 and outputs control commands to the execution unit 5.

[0031] The execution unit 5 includes a dryer switching valve group 51, a purge flow regulating valve 52, and a hydrogen fuel supply emergency shut-off valve 53. The dryer switching valve group 51 consists of multiple pneumatic or electric shut-off valves, which can realize the disturbance-free online switching between the main tower and the backup tower in the dryer group 22. The purge flow regulating valve 52 is a pneumatic or electric regulating valve, which is installed on the gas supply main pipe 23 and can continuously adjust the opening degree within the range of 60% to 150% of the design flow according to the instructions of the control unit 4. The hydrogen fuel supply emergency shut-off valve 53 is a pneumatic or electromagnetic emergency shut-off valve, which is installed at the inlet end of the inner pipe 11 and receives the emergency shut-off signal from the control unit 4.

[0032] In this embodiment, the relevant geometric parameters of the double-walled pipe 1 are as follows: the inner diameter D of the outer pipe 12 inner =80mm, outer diameter d of inner tube 11 outer =50mm, the cross-sectional area A of the annular interlayer 13 is A=π / 4×(0.08) 2 -0.05 2 )=0.00306m 2 Considering the preferential icing effect caused by the support device 6, the preset length L of the blockage characteristic pipe section is conservatively taken as the length occupied by one set of support devices 6 in the double-walled pipe 1. In this embodiment, L=1 meter, and the ice density is taken as the density value of dense ice, 917 kg / m³. 3 .

[0033] Control unit 4 can use two algorithms to calculate the ice blockage critical time. The first is the basic algorithm, suitable for rapid deployment or situations where sensor configuration is limited. It assumes that water vapor condenses completely in situ, and the formula is: ; The second method is the optimization algorithm, which requires obtaining calibration parameters through preliminary experiments. The formula introduces the coagulation adhesion coefficient η: ; This embodiment uses the preferred algorithm as the default configuration. The condensation adhesion coefficient η was obtained through ground calibration tests conducted on a land-based test rig. The test rig was constructed with a double-walled pipe test section that matched the geometry of the actual ship. Nitrogen gas with known dew point and flow rate was introduced, and liquid nitrogen was introduced into the inner pipe to simulate wall temperature conditions from -196°C to -253°C. The pressure difference between the inlet and outlet of the annular interlayer 13 was continuously monitored, and the moment when the pressure difference suddenly increased was recorded as the actual blockage time t. exp And compared with the prediction time t under the basic algorithmbasic By comparison, the ratio η = t is obtained. basic / t exp Covering the commonly used purging flow rate range of actual ships (3~8m) 3 In multiple tests of the dew point range (-70℃~-30℃) and the dew point range (-70℃~-30℃), η was measured to be between 0.55 and 0.75. In order to retain an appropriate safety margin, the control unit 4 adopted the lower limit value η=0.55 according to the conservative principle. This calibration coefficient can be checked and updated according to the actual operating data during system maintenance.

[0034] like Figure 3 As shown, control unit 4 executes the following anti-icing control process: Step S1: Collect the dew point temperature T online at a sampling period of 1 to 5 seconds. dp , purge volume flow rate Q, absolute pressure P total Temperature T at 6 points on the wall of the support device wall ; Step S2, using Magnus's saturated vapor pressure formula, from T dp Calculate the saturated water vapor partial pressure P sat : ; Step S3, calculate the theoretical water vapor mass concentration C in the inert gas: ; Where ρN2 is the density of nitrogen gas at the current operating temperature and absolute pressure, which can be obtained from the ideal gas law ρN2=P total / (R N2 ×T gas ), R N2 =296.8 J / (kg·K), T gas The absolute temperature of nitrogen in the main gas supply pipe 23; Step S4: Retrieve the preset condensation adhesion coefficient η=0.55 and pipeline geometric parameters A and L, and calculate the critical ice blockage time t under the current operating conditions according to the optimized formula: ; Step S5: Compare the calculated t with the preset level three security threshold and trigger the corresponding action: If t ≥ 720 hours, the system is considered to be in a safe state, and only the current time, sensor values, and calculation results are recorded for trend analysis and post-event traceability. If 72 hours ≤ t < 720 hours, a Level 1 warning is triggered. Control unit 4 issues a yellow warning signal through the human-machine interface, displays the message "It is recommended to switch or regenerate the dryer", and simultaneously sends an alarm to the ship's monitoring and alarm system. Operators can then arrange planned maintenance according to the prompt. If 4 hours ≤ t < 72 hours, a level 2 alarm is triggered, and control unit 4 issues an orange alarm signal. At the same time, the following intervention actions are automatically executed: First, the gas supply source is switched from the in-use drying tower to the standby drying tower through the dryer switching valve group 51. The switching process adopts the first-open-then-closed timing logic to ensure the continuity of gas supply. Second, the opening degree of the purge flow regulating valve 52 is increased from the current value to 120% of the design flow rate to increase the airflow shear force in the interlayer, slow down the ice layer adhesion rate and accelerate the removal of loose ice crystals. To speed up the response, open-loop feedforward control can be used to directly move the purge flow regulating valve 52 to the preset opening degree in one step. If t < 4 hours, a three-level interlock is triggered. Control unit 4 issues a red alarm signal and immediately closes the emergency shut-off valve 53 for hydrogen fuel supply, stopping fuel delivery and automatically initiating the pipeline heating and purging procedure. The heating and purging process uses an electric heater or hot nitrogen bypass on the main gas supply pipe 23 to raise the temperature of the purging gas to approximately 40-60°C above the ambient temperature. This gas is continuously introduced into the annular jacket 13 to melt the frost that has formed and discharge it through the exhaust port 24. This process continues until the pressure drop in the annular jacket 13 returns to normal and the humidity sensor confirms that there is no residual moisture in the jacket. Only then can the system be manually reset and restarted.

[0035] In addition, control unit 4 executes a safety redline self-tuning program after each system startup or after the operating conditions stabilize. The operator can input the preset minimum safe operating time t through the human-machine interface. safe In this embodiment, the factory default setting is 720 hours, which can be adjusted according to the voyage plan and maintenance capabilities. The controller uses an optimized formula to calculate the maximum allowable effective water vapor concentration C within this safe period. max : ; Then by C max By inversely calculating the corresponding saturated water vapor partial pressure, and then using the inverse Magnus function, the maximum allowable dew point temperature T can be determined. dpmax Control unit 4 will also directly trigger a "high dew point" warning, forcibly prompting operators to check the working status of nitrogen cylinder 21 and dryer group 22. This mechanism controls the process from the source to ensure that the dryness of the purging gas always meets the basic requirements for safe operation.

[0036] When the system disables the correction function of the condensation adhesion coefficient η for the purpose of simplifying configuration, the controller will automatically set η to 1, degenerating into the basic algorithm. At this time, the prediction time is shorter than the actual situation, the safety margin is larger, but the frequency of false alarms will increase. Operators can switch the algorithm mode in the system maintenance interface according to the actual situation.

[0037] Through the above technical solution, the marine hydrogen fuel double-wall delivery control system in this embodiment can accurately predict the ice blockage trend in laboratory simulation and actual ship test. In particular, it provides sufficient early warning for the priority ice blockage at the support device 6, effectively avoiding the blockage accident of the annular interlayer 13 caused by insufficient dryness of the purging gas. Compared with the ideal model without the introduction of the condensation adhesion coefficient, it significantly reduces the false alarm rate and improves the availability and operational safety of the system.

[0038] The above description is merely a preferred embodiment of this application and is not intended to limit this application. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A marine hydrogen fuel double-wall delivery control system, characterized in that, include A double-walled pipe (1) is provided, comprising an inner pipe (11) and an outer pipe (12), wherein an annular sandwich (13) is formed between the inner pipe (11) and the outer pipe (12), and a support device (6) for maintaining the distance between the inner pipe (11) and the outer pipe (12) is provided in the annular sandwich (13); A purging unit (2) is used to supply purging inert gas into the annular interlayer (13); The sensing and detection unit (3) is used to collect the dew point temperature, flow rate and pressure of the purging inert gas in real time. The control unit (4) is configured to calculate the water vapor mass concentration in the purge inert gas based on the dew point temperature, and to calculate the critical time required for the annular interlayer (13) to be completely blocked by ice based on the water vapor mass concentration, the flow rate and the geometric parameters of the annular interlayer (13). The control unit (4) is set with a preset safety threshold. When the critical time for ice blockage is lower than the preset safety threshold, an early warning or interlocking protection action is triggered.

2. The marine hydrogen fuel double-wall delivery control system according to claim 1, characterized in that: The formula used by the control unit (4) to calculate the critical time t of ice blockage is as follows: ； Wherein: ρ is the ice density, A is the annular cross-sectional area of ​​the annular interlayer (13), L is the length of the preset blockage characteristic pipe section, Q is the volumetric flow rate of the purging inert gas, and C is the water vapor mass concentration.

3. The marine hydrogen fuel double-wall delivery control system according to claim 2, characterized in that: The control unit (4) also stores the condensation adhesion coefficient η obtained through previous experimental calibration, and modifies the formula for calculating the critical time of ice blockage as follows: ； Wherein, η is the condensation adhesion coefficient, and 0<η≤1, which represents the proportion of water vapor contained in the purging inert gas that actually participates in the adhesion and icing on the extremely cold wall surface of the annular interlayer (13) and the support device (6). This coefficient comprehensively corrects the reduction in icing caused by water vapor supersaturation escape and ice crystals being carried out of the annular interlayer (13) by the airflow.

4. The marine hydrogen fuel double-wall delivery control system according to claim 3, characterized in that: The coagulation adhesion coefficient η ranges from 0.55 to 0.75, and the control unit (4) uses the lower limit of this range according to the conservative principle.

5. The marine hydrogen fuel double-wall delivery control system according to claim 1, characterized in that: The control unit (4) is also configured to calculate the maximum allowable water vapor mass concentration based on the formula of the ice blockage critical time according to the preset minimum allowable safe operating time, and to convert the maximum allowable dew point temperature from the concentration, and set it as the absolute control red line. When the dew point temperature measured by the sensing unit (3) exceeds the red line, the control unit (4) will forcibly execute an intervention action, which includes at least issuing an alarm or automatically switching the dryer.

6. The marine hydrogen fuel double-wall delivery control system according to claim 1, characterized in that: The preset safety threshold includes at least a first-level time threshold and a second-level time threshold, and the first-level time threshold is greater than the second-level time threshold; When the critical time for ice blockage is lower than the first-level time threshold, the control unit (4) triggers a prompt signal for dryer regeneration or switching; When the ice blockage critical time is lower than the second-level time threshold, the control unit (4) triggers an emergency cut-off command for the hydrogen fuel supply.

7. The marine hydrogen fuel double-wall delivery control system according to claim 1, characterized in that: The sensing and detection unit (3) includes a dew point sensor (31), a mass flow meter (32), and a pressure transmitter (33), all of which are installed on the main gas supply pipe (23) for purging inert gas. The sensing and detection unit (3) also includes at least one temperature sensor (34), which is attached to the surface of the support device (6) to obtain the local wall temperature of the preferential freezing area.

8. The marine hydrogen fuel double-wall delivery control system according to claim 1, characterized in that: It also includes an execution unit (5) electrically connected to the control unit (4), the execution unit (5) including a dryer switching valve group (51), a purge flow regulating valve (52) and a hydrogen fuel supply emergency shut-off valve (53).

9. The marine hydrogen fuel double-wall delivery control system according to any one of claims 1 to 8, characterized in that: The support device (6) includes a number of support parts (61) arranged in a ring array. The cross-sectional shape of the support parts (61) is serpentine, and the inward ends of all the support parts (61) are fixedly connected to each other and sleeved on the outer wall of the inner tube (11).

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