Positive pressure explosion-proof hydrogen generation system and method

Abstract

The invention discloses a positive-pressure explosion-proof hydrogen generation system and method. The system comprises a cavity and a positive-pressure purging device, the cavity comprises a positive pressure anti-explosion area and a non-anti-explosion area; the positive pressure explosion-proof area is provided with a hydrogen generator and an oxygen alarm device; the non-explosion-proof area is provided with a water tank used in cooperation with the hydrogen generator. The oxygen alarm device is used for detecting the oxygen concentration so as to monitor whether the hydrogen generator leaks or not; and the positive pressure purging device is used for controlling the clean inert protective gas to enter the cavity, so that the pressure in the cavity is higher than the pressure outside the cavity, a pressure environment meeting safe operation is formed, and pressure relief in the cavity is realized when the pressure in the cavity is higher than a set threshold value. According to the invention, full-process automatic management of hydrogen production, hydrogen supply and a safety state can be realized, and the operation safety and reliability in a dangerous environment are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of explosion-proof hydrogen production, specifically to a positive pressure explosion-proof hydrogen generation system and method. Background Technology

[0002] Hydrogen, as a clean and efficient energy source and an important industrial raw material, has been widely used in petrochemical, analytical, and testing fields. Especially in the petrochemical industry, hydrogen is often used as a carrier gas in instruments such as chromatographs. However, the safe direct use of hydrogen in flammable and explosive environments still faces significant challenges, particularly in situations requiring continuous, high-flow-rate supply, where the limitations of traditional technologies become even more pronounced.

[0003] In existing technologies, the most common method of hydrogen supply is to transport hydrogen through high-pressure steel cylinders. However, this method has several drawbacks: First, high-pressure steel cylinders themselves pose a significant risk of hydrogen storage, and leaks or even explosions can easily occur during use, handling, and replacement. Second, when the gas consumption is large, frequent cylinder replacements are required, which not only increases the workload of equipment maintenance personnel but also increases manpower consumption. In addition, traditional steel cylinder hydrogen supply modes are mostly based on manual monitoring and management, with low levels of automation and intelligence, making it difficult to detect leaks or operational anomalies in a timely manner and to quickly cut off the source of risk, thus posing significant safety hazards.

[0004] Some patented technologies have attempted to address the safety issues of hydrogen use in flammable and explosive environments. For example, patent CN108023451B discloses a positive-pressure explosion-proof generator, which improves the safety of the equipment in hazardous environments by setting a cavity outside the generator body. However, the core of this solution still lies in the explosion-proof design of electrical equipment, and its structure and function are mainly aimed at motor-type power generation equipment, without involving the intelligent safety management of the hydrogen generation and supply system itself. Another example is patent CN211015846U, which discloses the interlocking structure of a hydrogen alarm in a positive-pressure explosion-proof cabinet. The focus is on accident prevention through hydrogen concentration detection and alarm interlocking circuits. Although this solution can interlock and cut off power when an excessive concentration is detected, it is still a passive, reactive protection measure and lacks intelligent management and status recognition of the hydrogen generation device itself.

[0005] Therefore, current technologies lack a hydrogen generation solution specifically designed for hazardous environments such as petrochemical plants that require continuous and stable hydrogen supply, and which integrates positive pressure explosion-proof technology with intelligent control to achieve active monitoring, automatic dilution, status management, and safety interlocks. Thus, a new positive pressure explosion-proof hydrogen generation system and method are needed to achieve fully automated management of hydrogen production, supply, and safety status, significantly improving operational safety and reliability in hazardous environments. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to overcome the defects in the prior art and provide a positive pressure explosion-proof hydrogen generation system and method, which can realize the full-process automated management of hydrogen production, supply and safety status, and greatly improve the operational safety and reliability in hazardous environments.

[0007] The positive pressure explosion-proof hydrogen generation system of the present invention includes a cavity and a positive pressure purging device; the cavity includes a positive pressure explosion-proof area and a non-explosion-proof area; the positive pressure explosion-proof area is equipped with a hydrogen generator and an oxygen alarm device; the non-explosion-proof area is equipped with a water tank used in conjunction with the hydrogen generator; the oxygen alarm device is used to detect the oxygen concentration, thereby monitoring whether the hydrogen generator is leaking.

[0008] The positive pressure purging device is used to control the entry of clean inert protective gas into the cavity, so that the pressure inside the cavity is higher than the pressure outside the cavity, forming a pressure environment that meets the requirements for safe operation, and to release the pressure inside the cavity when the pressure inside the cavity exceeds a set threshold.

[0009] Furthermore, it also includes a heating device installed inside the cavity; the heating device is used to ensure that the hydrogen generator and water tank will not be affected by freezing in cold application environments.

[0010] Furthermore, it also includes a cooling device installed inside the cavity; the cooling device is used to ensure the normal operation of the hydrogen generator in hot application environments.

[0011] Furthermore, clean compressed air is used as the gas to purge the inert protective gas from the outer shell of the cavity before opening the cavity; wherein, the clean compressed air is connected to the cavity through a pressure reducing valve.

[0012] Furthermore, the flow rate of the inert protective gas entering the cavity is adjustable.

[0013] Furthermore, it also includes a canopy located above the outer side of the cavity.

[0014] Furthermore, it also includes an explosion-proof lighting facility located on the outside of the cavity; the explosion-proof lighting facility is used to provide sufficient lighting at night or when there is insufficient light.

[0015] A method for generating explosion-proof hydrogen using a positive-pressure explosion-proof hydrogen generation system includes the following steps:

[0016] S1. Perform a pre-start check on the external air source, electrical control equipment, external power supply, and the pressure retention of the cavity;

[0017] S2. Input an external air source into the cavity. If the air exchange flow rate and positive pressure value are reached, start timing and proceed to the next step; otherwise, return to step S1 to perform a pre-start check.

[0018] S3. When the external power supply is turned on, if the inert protective gas replacement time has been reached and the positive pressure in the cavity is greater than xpa, proceed to the next step; otherwise, return to step S1 to perform the pre-start check.

[0019] S4. Manually reset the oxygen alarm. The system will automatically power on and perform the following continuous checks:

[0020] If the positive pressure inside the cavity is less than xpa, the system will shut down and trigger an alarm.

[0021] If the oxygen content in the cavity is greater than or equal to n%, the system will shut down and trigger an alarm.

[0022] If the hydrogen generator malfunctions, the system will shut down and trigger an alarm.

[0023] Furthermore, two operating modes are set for the system: running mode and bypass mode;

[0024] During normal operation on site, the operating mode is used. The operating mode is restricted by the alarm. If an alarm is present when the power switch is turned on, the hydrogen generator will not be powered. At the same time, if an alarm occurs during system operation, the power supply to the hydrogen generator will also be cut off.

[0025] In bypass mode, when the power switch is turned on, the system can be directly powered on and start working without being restricted by alarms. In this mode, the bypass mode status will be output externally, and the bypass mode indicator light on the distribution box will light up yellow. If an alarm is present in this mode, the power will not be cut off, and the alarm status will be output externally, while the fault indicator light on the distribution box will light up red.

[0026] Furthermore, in operation mode, when an alarm occurs, a corresponding alarm signal will be output to the outside world, and the fault indicator light will illuminate at the same time; among them, the alarm types include incomplete ventilation alarm, high oxygen content alarm, and hydrogen generator alarm.

[0027] The alarm occurrence scenarios and clearing methods are set as follows:

[0028] For alarms caused by incomplete ventilation due to disruption of the positive pressure environment inside the chamber or incomplete ventilation, the system will cut off the power to the hydrogen generator when such an alarm occurs. Once the positive pressure environment inside the chamber is restored, the system will automatically clear the alarm after the chamber has completed ventilation according to the set purging time and a ventilation completion signal has been issued again.

[0029] When the oxygen content in the chamber exceeds n%, a high oxygen content alarm will be generated. When this alarm occurs, the system will cut off the power supply to the hydrogen generator. It will not recover automatically, and the alarm will not disappear automatically. The alarm needs to be manually cleared by alarm reset.

[0030] When a hydrogen generator alarm occurs, the system will cut off the power to the hydrogen generator. The power will not automatically recover, and the alarm will not disappear automatically. The alarm must be manually cleared by resetting the alarm.

[0031] The beneficial effects of this invention are as follows: The positive pressure explosion-proof hydrogen generation system and method disclosed in this invention integrate a hydrogen generator, an oxygen alarm device, and a heating and cooling device within the cavity, and are combined with a positive pressure purging and intelligent control system to achieve fully automated management of hydrogen production, supply, and safety status. It has good explosion-proof performance, is simple to operate and maintain, easy to install and wire, and has good airtightness. It fully considers the needs of hydrogen generator liquid replenishment, pressure relief, venting, and high and low temperature outdoor environments, which can reduce manpower consumption and greatly improve the operational safety and reliability in hazardous environments. Attached Figure Description

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0033] Figure 1 This is a schematic diagram of the hydrogen generation system of the present invention;

[0034] Figure 2 This is a schematic diagram of the hydrogen generation method based on the generation system of the present invention. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings, as shown in the figures:

[0036] This embodiment discloses a positive pressure explosion-proof hydrogen generation system, including a cavity and a positive pressure purging device;

[0037] The cavity includes a positive pressure explosion-proof area and a non-explosion-proof area. The positive pressure explosion-proof area is equipped with a hydrogen generator and an oxygen alarm device. The non-explosion-proof area is equipped with a water tank used in conjunction with the hydrogen generator, located below the hydrogen generator. The oxygen alarm device is used to detect the oxygen concentration, thereby monitoring whether the hydrogen generator is leaking. The cavity can be a positive pressure explosion-proof cabinet or a positive pressure explosion-proof box. The cavity is equipped with a door (one or more doors) and a viewing window or screen. The oxygen alarm device is an oxygen alarm or oxygen detector. The hydrogen generator electrolyzes water to produce hydrogen and oxygen in proportion. If there is a leak in the electrolysis cell, both hydrogen and oxygen will leak. By detecting the oxygen leak, it can be known that the hydrogen generator is leaking.

[0038] The positive pressure purging device controls the entry of clean inert protective gas into the cavity, ensuring that the pressure inside the cavity is higher than the pressure outside, creating a pressure environment that meets safety requirements. This prevents flammable gases from entering the cavity, guaranteeing the safe operation of the internal hydrogen generator and electronic control components. Simultaneously, the dilution effect of the inert protective gas ensures that the hydrogen concentration is diluted to a safe range in the event of a hydrogen generator leak. Furthermore, it releases pressure within the cavity when the pressure exceeds a set threshold. The positive pressure purging device includes a positive pressure controller and its associated components (such as a pressure relief valve / safety valve); these will not be elaborated further. The inert protective gas can be nitrogen; clean nitrogen is used as the positive pressure purging protective gas and is connected to the positive pressure purging device via a positive pressure purging pipeline.

[0039] Hydrogen generators are a common type of hydrogen production equipment. However, general hydrogen generators are only suitable for conventional, safe locations and cannot be used in environments with flammable or explosive hazards, such as chemical plants, natural gas transmission stations, and oil refineries. To use a hydrogen generator in these scenarios, explosion-proof measures are necessary. Explosion-proof principles are generally categorized as flameproof, increased safety, positive pressure, and non-sparking. The positive pressure explosion-proof hydrogen generation system of this invention prevents external explosive substances from entering its housing by creating a sufficiently large positive pressure within the cavity.

[0040] This invention significantly improves operational safety in hazardous environments by integrating a hydrogen generator and an oxygen alarm device within a cavity, and coordinating with a positive pressure purging device to achieve intelligent adjustment and control. The positive pressure purging device continuously supplies clean inert gas into the cavity, creating a slightly positive pressure environment that effectively prevents the entry of external flammable gases. Simultaneously, it automatically depressurizes when the pressure inside the cavity exceeds a set threshold, preventing overpressure risks. Through real-time detection of oxygen concentration, the system can intelligently monitor hydrogen generator leaks, enabling proactive early warning and safety interlocks, thus enhancing the overall automation and intelligence level of the system.

[0041] In this embodiment, the hydrogen generation system of the present invention further includes a heating device disposed within the cavity; the heating device is used to ensure that the hydrogen generator and water tank are not affected by freezing in cold application environments. The heating device can be an explosion-proof electric heater or a steam heater, or it can be an insulation layer.

[0042] By installing a heating device inside the cavity, the hydrogen generator and its water tank can be heated and kept warm in low-temperature or cold environments, preventing a decrease in hydrogen production efficiency or equipment failure due to icing. This effectively improves the system's environmental adaptability and reliability, ensures the continuity and stability of hydrogen supply, and further enhances the system's safety and intelligent operation level under extreme climatic conditions.

[0043] In this embodiment, the hydrogen generation system of the present invention further includes a cooling device disposed within the cavity; the cooling device is used to ensure the normal operation of the hydrogen generator body in hot application environments. The cooling device can be a vortex tube cooler or an explosion-proof electric cooler.

[0044] By adding a cooling device inside the chamber, the hydrogen generator can be effectively cooled in high-temperature or hot environments, preventing performance degradation or malfunction due to excessive temperature. This enhances the system's reliability and continuous hydrogen supply capacity in high-temperature environments, avoids safety hazards caused by overheating, and improves the overall environmental adaptability and intelligent operation level of the system.

[0045] In this embodiment, clean compressed air is used as the gas to purge the inert protective gas from the outer shell of the cavity before opening the cavity; wherein, the clean compressed air is connected to the cavity through a pressure reducing valve.

[0046] By purging the outer shell of the chamber with clean compressed air before opening it, adhering inert protective gases can be effectively removed, preventing them from diffusing into the working environment. This reduces the potential safety risks posed by leaking gases, improves safety during equipment inspection and maintenance, and ensures a balance between purging effectiveness and gas consumption by regulating the airflow through a pressure reducing valve.

[0047] In this embodiment, the flow rate of the inert protective gas entering the cavity is adjustable. Even under extreme conditions, such as a detached hydrogen pipeline, malfunction of the hydrogen generator, or a malfunction of the oxygen alarm device, sufficient purging volume can still ensure that the hydrogen is diluted to a safe level.

[0048] By adjusting the flow rate of inert protective gas entering the cavity, the system can save gas resources under normal operating conditions. In extreme cases, such as when there is a large hydrogen leak and the monitoring fails, the purging volume can be increased to quickly dilute the hydrogen concentration to a safe range, thereby enhancing the system's fault tolerance and intrinsic safety, and further improving the level of intelligent protection and operational reliability.

[0049] This embodiment also includes a rain canopy disposed above the outer side of the cavity. By providing a rain canopy above the outer side of the cavity, rainwater and snowmelt can be effectively prevented from directly wetting the equipment, reducing the risk of electrical short circuits, corrosion, and mechanical damage, and improving the system's applicability and durability in outdoor or complex climatic conditions. At the same time, it helps extend the equipment's service life and ensures the safe and stable operation of the hydrogen generation system in variable environments.

[0050] This embodiment also includes an explosion-proof lighting facility located on the outside of the cavity; the explosion-proof lighting facility provides sufficient illumination at night or in low-light conditions. By adding an explosion-proof lighting facility on the outside of the cavity, stable lighting can be provided for inspection, operation, and maintenance at night or in low-light environments, facilitating observation of system status and indicator light information. The explosion-proof lighting structure design ensures safe use even in potentially flammable and explosive locations, effectively improving the system's operational convenience and safety, and further enhancing its overall intelligence and applicability.

[0051] The present invention also relates to a positive pressure explosion-proof hydrogen generation method using the positive pressure explosion-proof hydrogen generation system of the above embodiments, comprising the following steps:

[0052] S1. Perform a pre-start check on the external air source, electrical control equipment, external power supply, and the pressure retention of the cavity;

[0053] S2. Input an external air source into the cavity. If the ventilation flow rate and positive pressure value are reached, start timing and proceed to the next step; otherwise, return to step S1 for pre-start checks. Existing flow meters and pressure gauges can be used to monitor the ventilation flow rate and positive pressure value in real time.

[0054] S3. When the external power supply is turned on, if the inert protective gas replacement time has been reached and the positive pressure in the cavity is greater than 300pa, proceed to the next step; otherwise, return to step S1 to perform the pre-start check. The replacement time can be set according to the actual working conditions, which will not be elaborated here. The 300pa judgment index is based on the actual positive pressure controller parameters.

[0055] S4. Manually reset the oxygen alarm. The system will automatically power on and perform the following continuous checks:

[0056] If the positive pressure inside the cavity is less than 300 Pa, the system will shut down and trigger an alarm.

[0057] If the oxygen content in the chamber is greater than or equal to 2%, the system will shut down and trigger an alarm. The oxygen content is set at 2% because the explosive limits of hydrogen in air are 4.0% to 75.6% (volume concentration). The hydrogen generator produces oxygen at a ratio of 2 parts hydrogen to 1 part oxygen, so the hydrogen generator produces 4% hydrogen for every 2% oxygen produced.

[0058] If the hydrogen generator malfunctions, the system will shut down and trigger an alarm.

[0059] The above method enables multi-level intelligent detection and interlocking control of the gas source, power supply, cavity sealing, and oxygen concentration. It can automatically cut off the power and trigger an alarm in abnormal situations, significantly improving the inherent safety and reliability of the system. Simultaneously, this method combines flow and pressure monitoring in real time, achieving fully automated management of the entire process, effectively reducing the need for human intervention and ensuring the stable and safe hydrogen generation process.

[0060] It should be noted that the hydrogen generation system of the present invention also includes a safety device; the safety device can be an explosion-proof distribution box, which is equipped with components such as an AC contactor, a power switch, a mode selection knob, status indicator lights, an alarm reset button, a 24V power supply, a safety barrier, and relays to realize the logical function of the safety device. The safety device circuit can be constructed using relay groups to reduce costs, or it can be implemented using other forms such as a PLC (Programmable Logic Controller). The system can be installed indoors or outdoors, either directly on the ground or wall-mounted according to usage requirements.

[0061] The steps of the methods or algorithms disclosed in this invention can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0062] In this embodiment, two working modes are set for the system: running mode and bypass mode;

[0063] During normal operation on site, the operating mode is used. The operating mode is restricted by the alarm. If an alarm is present when the power switch is turned on, the hydrogen generator will not be powered. At the same time, if an alarm occurs during system operation, the power supply to the hydrogen generator will also be cut off.

[0064] In bypass mode (also known as Bypass mode), the system can be powered directly and start working without being restricted by alarms when the power switch is turned on. In this mode, the bypass mode status will be output externally, and the bypass mode indicator light on the distribution box will light up yellow. If an alarm exists in this mode, the power will not be cut off, and the alarm status will be output externally, while the fault indicator light on the distribution box will light up red.

[0065] By setting up operating mode and bypass mode, a more flexible control strategy is achieved: in operating mode, the power supply can be automatically cut off to ensure safety in case of abnormality; in bypass mode, the need for continuous operation under special circumstances is met, and the operation will not be interrupted even if an alarm is present, and alarm status and indicator light prompts will be output simultaneously; thereby effectively improving the intelligent management and adaptability of the system, and enhancing the flexibility and controllability of on-site operation and maintenance while ensuring safety.

[0066] In this embodiment, during operation, when an alarm occurs, a corresponding alarm signal will be output to the outside, and the fault indicator light will illuminate. The alarm types include incomplete ventilation alarm, high oxygen content alarm, and hydrogen generator alarm.

[0067] The alarm occurrence scenarios and clearing methods are set as follows:

[0068] For alarms caused by incomplete ventilation due to disruption of the positive pressure environment inside the chamber or incomplete ventilation, the system will cut off the power to the hydrogen generator when such an alarm occurs. Once the positive pressure environment inside the chamber is restored, the system will automatically clear the alarm after the chamber has completed ventilation according to the set purging time and a ventilation completion signal has been issued again.

[0069] When the oxygen content in the chamber exceeds 2%, a high oxygen content alarm will be generated. When this alarm occurs, the system will cut off the power supply to the hydrogen generator. It will not automatically recover, and the alarm will not disappear automatically. You need to manually reset and clear the alarm by pressing the alarm reset button on the distribution box.

[0070] When the hydrogen generator alarm occurs, the system will cut off the power supply to the hydrogen generator. The power will not be automatically restored, and the alarm will not disappear automatically. You need to manually reset and clear the alarm by pressing the alarm reset button on the distribution box.

[0071] By refining various alarm types under different operating modes and combining them with automatic or manual alarm cancellation methods, the system achieves hierarchical intelligent management of chamber positive pressure, oxygen content, and hydrogen generator status. When a risk occurs, the system can immediately cut off the power supply and output an alarm signal, while simultaneously alerting maintenance personnel through fault indicator lights. This ensures operational safety, improves the visibility and controllability of fault handling, and enhances the system's safety and intelligence level.

[0072] This invention employs a positive pressure explosion-proof design combined with intelligent control to prevent explosions of hydrogen generators in hazardous environments. It enhances safety, automation, intelligence, convenience, and reliability while reducing manpower. The system is intelligent, allowing for remote transmission of data and alarm status, and enabling monitoring of system operation. Hazard assessment is based on the hydrogen generator's operating status and the oxygen concentration within the monitoring chamber, providing enhanced safety. The purging volume of this system is adjustable; even in extreme situations, such as hydrogen pipeline detachment, simultaneous malfunction of the hydrogen generator and oxygen alarm, sufficient purging volume can still dilute the hydrogen to a safe level.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A positive pressure explosion-proof hydrogen generation system, characterized in that: It includes a cavity and a positive pressure purging device; the cavity includes a positive pressure explosion-proof area and a non-explosion-proof area; the positive pressure explosion-proof area is equipped with a hydrogen generator and an oxygen alarm device; the non-explosion-proof area is equipped with a water tank used in conjunction with the hydrogen generator; the oxygen alarm device is used to detect the oxygen concentration, thereby monitoring whether the hydrogen generator is leaking. The positive pressure purging device is used to control the entry of clean inert protective gas into the cavity, so that the pressure inside the cavity is higher than the pressure outside the cavity, forming a pressure environment that meets the requirements for safe operation, and to release the pressure inside the cavity when the pressure inside the cavity exceeds a set threshold.

2. The positive pressure explosion-proof hydrogen generation system according to claim 1, characterized in that: It also includes a heating device installed inside the cavity; the heating device is used to ensure that the hydrogen generator and water tank will not be affected by freezing in cold application environments.

3. The positive pressure explosion-proof hydrogen generation system according to claim 1, characterized in that: It also includes a cooling device installed inside the cavity; the cooling device is used to ensure that the hydrogen generator can be used normally in hot application environments.

4. The positive pressure explosion-proof hydrogen generation system according to claim 1, characterized in that: Clean compressed air is used to purge the outer shell of the chamber before opening it to remove the inert protective gas; the clean compressed air is connected to the chamber through a pressure reducing valve.

5. The positive pressure explosion-proof hydrogen generation system according to claim 1, characterized in that: The flow rate of the inert protective gas entering the cavity is adjustable.

6. The positive pressure explosion-proof hydrogen generation system according to claim 1, characterized in that: It also includes a canopy located above the outer side of the cavity.

7. The positive pressure explosion-proof hydrogen generation system according to claim 1, characterized in that: It also includes explosion-proof lighting facilities installed on the outside of the cavity; the explosion-proof lighting facilities are used to provide sufficient lighting at night or when there is insufficient light.

8. A method for generating positive pressure explosion-proof hydrogen using the positive pressure explosion-proof hydrogen generation system according to any one of claims 1-7, characterized in that: Includes the following steps: S1. Perform a pre-start check on the external air source, electrical control equipment, external power supply, and the pressure retention of the cavity; S2. Input an external air source into the cavity. If the air exchange flow rate and positive pressure value are reached, start timing and proceed to the next step; otherwise, return to step S1 to perform a pre-start check. S3. When the external power supply is turned on, if the inert protective gas replacement time has been reached and the positive pressure in the cavity is greater than xpa, proceed to the next step; otherwise, return to step S1 to perform the pre-start check. S4. Manually reset the oxygen alarm. The system will automatically power on and perform the following continuous checks: If the positive pressure inside the cavity is less than xpa, the system will shut down and trigger an alarm. If the oxygen content in the cavity is greater than or equal to n%, the system will shut down and trigger an alarm. If the hydrogen generator malfunctions, the system will shut down and trigger an alarm.

9. The positive pressure explosion-proof hydrogen generation method according to claim 8, characterized in that: Set two operating modes for the system: run mode and bypass mode; During normal operation on site, the operating mode is used. The operating mode is restricted by the alarm. If an alarm is present when the power switch is turned on, the hydrogen generator will not be powered. At the same time, if an alarm occurs during system operation, the power supply to the hydrogen generator will also be cut off. In bypass mode, when the power switch is turned on, the system can be directly powered on and start working without being restricted by alarms. In this mode, the bypass mode status will be output externally, and the bypass mode indicator light on the distribution box will light up yellow. If an alarm is present in this mode, the power will not be cut off, and the alarm status will be output externally, while the fault indicator light on the distribution box will light up red.

10. The positive pressure explosion-proof hydrogen generation method according to claim 9, characterized in that: In operation mode, when an alarm occurs, a corresponding alarm signal will be output to the outside world, and the fault indicator light will illuminate. The alarm types include incomplete ventilation alarm, high oxygen content alarm, and hydrogen generator alarm. The alarm occurrence scenarios and clearing methods are set as follows: For alarms caused by incomplete ventilation due to disruption of the positive pressure environment inside the chamber or incomplete ventilation, the system will cut off the power to the hydrogen generator when such an alarm occurs. Once the positive pressure environment inside the chamber is restored, the system will automatically clear the alarm after the chamber has completed ventilation according to the set purging time and a ventilation completion signal has been issued again. When the oxygen content in the chamber exceeds n%, a high oxygen content alarm will be generated. When this alarm occurs, the system will cut off the power supply to the hydrogen generator. It will not recover automatically, and the alarm will not disappear automatically. The alarm needs to be manually cleared by alarm reset. When a hydrogen generator alarm occurs, the system will cut off the power to the hydrogen generator. The power will not automatically recover, and the alarm will not disappear automatically. The alarm must be manually cleared by resetting the alarm.

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