Infrared thermal imaging detection controlled hydrogen station blower purging explosion-proof system and method

Abstract

The application provides a hydrogen station blower purging explosion-proof system with infrared thermal imaging detection control, which comprises a red thermal imaging camera, a central control system, a blower, a hydrogen concentration monitoring device, an alarm and a control panel and the like, a thermal imaging camera covering the whole area of the hydrogen storage tank is installed, and a blower is arranged in each area to monitor the hydrogen leakage distribution in real time; once leakage is detected, the central control system identifies the area where the leakage position is located through the thermal imaging camera and issues an alarm, and at the same time, the blower in the area is controlled to be opened for purging until the hydrogen concentration monitoring device detects that the hydrogen concentration reaches a safety value, and the alarm is removed. The system will give an early warning to avoid potential safety accidents, find the leakage in time and take measures to prevent the situation from expanding to explosion, reduce the harm degree of the accident, reduce personnel casualties and property losses, effectively control the occurrence and spread of the accident, and improve the efficiency of accident response.

Description

Technical Field

[0001] This invention relates to the field of hydrogen leakage safety protection at hydrogen refueling stations, specifically to an explosion-proof system for purging blowers at hydrogen refueling stations using infrared thermal imaging detection and control. Background Technology

[0002] With the rapid development of the hydrogen energy industry, hydrogen refueling stations, as one of the key infrastructures of hydrogen energy technology, play a vital role in storing, distributing, and charging hydrogen. However, hydrogen, as a flammable and explosive gas, poses certain safety hazards during the operation of hydrogen refueling stations. High-pressure storage tanks for storing and transporting hydrogen are highly susceptible to leakage due to the deteriorating effects of hydrogen's chemical properties on materials. When a hydrogen leak occurs, the leaked hydrogen from the high-pressure storage tank can diffuse and accumulate in confined spaces such as hydrogen refueling stations. When the volume fraction of hydrogen in the air reaches 4-70%, a safety accident is highly likely.

[0003] According to existing data, more than 70% of the 425 hydrogen safety accidents that have occurred in the past few decades were caused by hydrogen leaks from pressure-bearing equipment such as high-pressure storage tanks. Therefore, solving the problem of high-pressure hydrogen storage tank leaks is a major issue concerning the national economy and people's livelihood. In particular, research and safety protection for hydrogen leaks in high-pressure storage tanks at hydrogen refueling stations are key to solving related safety problems.

[0004] Traditional hydrogen refueling station explosion-proof systems primarily rely on gas detection instruments and explosion-proof equipment for safety protection. However, these systems have limitations in detection speed and accuracy, and cannot respond promptly and effectively to sudden hydrogen leaks. Therefore, developing a more intelligent and efficient hydrogen refueling station explosion-proof system is urgently needed. Summary of the Invention

[0005] To address the above problems, this invention provides an infrared thermal imaging detection and control system for purging and explosion-proofing hydrogen refueling station blowers. This system not only monitors changes in hydrogen concentration inside high-pressure storage tanks and issues an alarm upon detecting a hydrogen leak, providing early warning and preventing potential safety accidents, but also promptly detects leaks and takes measures to prevent escalation into an explosion, reducing the severity of the accident and minimizing casualties and property damage. The presence of this purging and explosion-proof device effectively controls the occurrence and spread of accidents, improving the efficiency of accident response.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] An infrared thermal imaging detection and control system for purging explosion-proof hydrogen refueling station blowers includes:

[0008] An infrared thermal imaging camera covers the hydrogen refueling station area and is used to monitor temperature changes around the hydrogen storage tanks in real time.

[0009] Blowers are arranged in a matrix around the hydrogen storage tank at the hydrogen refueling station, and purify the leak area in a directional manner according to the instructions of the central control system.

[0010] The hydrogen concentration monitoring device is used to monitor the hydrogen concentration around the hydrogen storage tank and the purging area of ​​the hydrogen refueling station in real time, and to feed back the concentration data to the central control system.

[0011] The alarm is activated by the central control system when the hydrogen concentration reaches a preset safety threshold.

[0012] The control panel features a human-machine interface for manual operation and monitoring of the system's operating status, including control of the blower and alarms.

[0013] The central control system receives monitoring signals from the infrared thermal imaging camera and the hydrogen concentration monitoring device, processes the signals to identify the location and status of the hydrogen leak, and controls the alarm to start and stop, as well as the direction, speed, and start / stop of the blower to carry out purging operations based on the location and status of the hydrogen leak.

[0014] The beneficial effects of this system are as follows: By integrating infrared thermal imaging technology with blower purging function, this system enables real-time monitoring and rapid response to potential hydrogen leakage risks at hydrogen refueling stations. This integrated solution significantly improves the safety management level of hydrogen refueling stations, reduces the risk of safety accidents that may be caused by hydrogen leaks, and ensures the safety of personnel and facilities.

[0015] The detailed working principle of this system is as follows: It continuously monitors the temperature of the environment surrounding the hydrogen storage tank at the hydrogen refueling station using an infrared thermal imaging camera. Once an abnormal temperature is detected, it may indicate a hydrogen leak. The central control system quickly analyzes the thermal imaging data and data from the hydrogen concentration monitoring device to accurately locate the leak. Subsequently, the system automatically instructs the blower to directionally purge the leak point to dilute and disperse the hydrogen. Simultaneously, the control panel and central control system provide both manual operation interfaces and automatic control logic, ensuring that operators can intervene according to the actual situation.

[0016] In the best-case scenario, the thermal imaging camera is a 25mm dual-spectrum thermal imaging tube network camera with a resolution of 640×512, 4 million visible light pixels, and an infrared illumination distance of up to 100 meters.

[0017] The beneficial effects of the above implementation are:

[0018] Employing a high-resolution thermal imaging camera with long-range illumination capabilities, the system provides clearer and more precise images, enabling the capture of even minute temperature changes, thereby improving the sensitivity and accuracy of leak detection. Furthermore, the long-range illumination capability of the infrared lamp expands the monitoring range, ensuring effective monitoring even in remote areas of the hydrogen refueling station. The thermal imaging camera captures images with a high resolution of 640×512, and its 4-megapixel visible light resolution further enhances image clarity. The 25mm lens provides a long monitoring distance, while the 100-meter illumination range of the infrared lamp ensures effective monitoring even in low-light conditions. These features work together to allow the camera to capture temperature changes with greater accuracy over a wider area, providing the system with high-quality monitoring data.

[0019] In the best-case scenario, the central control system uses the MODBUS_RTU fieldbus protocol for bus communication to enable mutual access between the detector and the remote control terminal.

[0020] In the best-case scenario, the alarm uses an electromagnetic active buzzer of model HTY-1205.

[0021] In the preferred implementation scenario, the hydrogen concentration monitoring device uses a MAX250B sensor with a measurement range of 0~100%VOL, a resolution of ±1%, a response time of <15s, and an accuracy of ±1%; it is used to monitor changes in hydrogen concentration during purging operations to ensure that the hydrogen concentration in the purged area reaches a safe level after purging.

[0022] This invention also provides a method for explosion-proof purging of a hydrogen refueling station blower combined with infrared thermal imaging detection and control, comprising the following steps:

[0023] S1. Thermal imaging cameras monitor the hydrogen refueling station area in real time;

[0024] S2. When at least two thermal imaging cameras capture temperature change points within the same range, and the hydrogen concentration monitoring device reports a change in hydrogen concentration, it is determined that there is a hydrogen leak in the area.

[0025] S3. The central control system analyzes the signals fed back from the thermal imaging camera to obtain the specific location and extent of the leak area;

[0026] S4. The central control system determines whether the concentration of leaked hydrogen has reached the set safety threshold based on the data fed back by the hydrogen concentration monitoring device. When the hydrogen concentration exceeds the safety threshold, the central control system controls the alarm to sound an alarm.

[0027] S5. When the hydrogen concentration exceeds the safety threshold, the central control system calculates the rotation angle based on the specific location and range of the hydrogen leak area and the relative position of each blower, and controls the blowers to rotate in real time so that the air outlet is aimed at the area with the highest concentration for purging until the hydrogen concentration drops to a safe range.

[0028] S6. When the hydrogen concentration is below the safety threshold, the central control system automatically deactivates the alarm and resets the system to standby mode;

[0029] S7. When the central control system detects hydrogen leaks at no fewer than two locations, a comprehensive assessment is conducted based on the safety threshold and hydrogen concentration differences, and the blowing angle and force of the blower are adjusted.

[0030] The beneficial effects of this method are:

[0031] This method, through intelligent monitoring and control processes, enables rapid identification and effective handling of hydrogen leaks at hydrogen refueling stations, significantly improving the safety management level and emergency response capabilities of these stations.

[0032] The detailed working principle of this method is as follows:

[0033] This method first utilizes thermal imaging cameras to monitor the hydrogen refueling station area in real time. Once a temperature change is detected, combined with data from the hydrogen concentration monitoring device, the system quickly determines whether a hydrogen leak has occurred. Based on the analysis results, the central control system automatically controls the blower to perform directional purging, adjusting the wind speed and direction to dilute and disperse the hydrogen until the hydrogen concentration drops to a safe range. Simultaneously, the system automatically triggers an alarm when the hydrogen concentration exceeds the standard, alerting personnel, and automatically deactivates the alarm and resets the system to standby mode once the hydrogen concentration returns to normal.

[0034] In a preferred implementation scenario, the specific judgment method for S2 is as follows:

[0035] When a thermal imaging camera detects a temperature change point in an area, it transmits the data to the central control system. The central control system then adjusts the angle of another thermal imaging camera in the area of ​​the temperature change point to verify the area. Simultaneously, it verifies the data based on the signal from the hydrogen concentration monitoring device in the area of ​​the temperature change point. If the verification is successful, it is determined that there is a hydrogen leak in the area.

[0036] When the hydrogen concentration monitoring device detects a point of change in hydrogen concentration in a certain area, it transmits the data to the central control system. The central control system then adjusts the angles of at least two thermal imaging cameras within the area of ​​the temperature change point to verify the area. If the verification is successful, it is determined that there is a hydrogen leak in the area.

[0037] The beneficial effects of the above implementation are:

[0038] This method improves the system's adaptability and efficiency in handling complex leaks by refining the identification and handling process for multiple leak points, ensuring that hydrogen refueling stations can maintain a high level of safety performance when faced with multiple leaks.

[0039] The detailed working principle adopted in the above implementation is as follows:

[0040] When the central control system detects hydrogen leaks at at least two locations, it comprehensively assesses the specific situation of each leak point, including the location, extent, and hydrogen concentration. Based on the assessment results, the central control system dynamically adjusts the blower's purging angle and force to ensure that all leak points are effectively controlled. Furthermore, the system adjusts the wind speed in real time based on changes in hydrogen concentration to achieve a more precise purging effect.

[0041] In a preferred implementation scenario, when the hydrogen concentration monitoring device detects that the hydrogen concentration in the area exceeds the safety threshold of 10%, the central control system sets the blower speed to the maximum and selects the corresponding wind speed based on the range of the highest concentration.

[0042] When the hydrogen concentration sensor detects that the maximum hydrogen concentration is below the safety threshold of 4%, the central control system sets the alarm and blower to shut down, and rotates the blower back to its initial state so that the blower can respond and adjust as quickly as possible when purging different leak areas in the future.

[0043] The beneficial effects of the above implementation are:

[0044] This method, by setting specific wind speed adjustment strategies, enables the system to automatically adjust the working state of the blower according to different hydrogen concentrations, improving the adaptability and energy efficiency of purging operations, and ensuring that hydrogen concentration can be quickly and effectively reduced to a safe range under different concentration conditions.

[0045] The detailed working principle adopted in the above implementation is as follows:

[0046] Based on data from the hydrogen concentration monitoring device, the central control system automatically sets the blower speed to maximum when the hydrogen concentration exceeds the safety threshold of 10%, and selects the appropriate wind speed for purging based on the area with the highest hydrogen concentration. When the hydrogen concentration falls below the safety threshold of 4%, the central control system automatically shuts off the alarm and blower, and adjusts the blower to its initial state to prepare for the next purging operation, ensuring that the system can respond quickly under different conditions.

[0047] In a preferred embodiment, step S5 further includes the following steps:

[0048] S5a. The central control system adjusts the rotation angle of the blower according to the location and extent of the hydrogen leak area and the relative position of the blower to ensure that the air outlet is aligned with the leak area.

[0049] S5b. The central control system assesses the maximum and minimum hydrogen concentrations within the leak area based on data from the hydrogen concentration monitoring device to determine the hydrogen concentration gradient.

[0050] S5c. Based on the hydrogen concentration gradient, the central control system adjusts the blower speed to ensure that the wind speed matches the hydrogen concentration gradient.

[0051] The S5d central control system monitors the blower speed in real time and dynamically adjusts the speed based on real-time hydrogen concentration data to ensure the hydrogen concentration drops to a safe range. If the hydrogen concentration remains above the safe threshold, the blower speed is automatically increased.

[0052] The S5e central control system records and analyzes the effect of each purging operation, and adjusts relevant parameters through optimization algorithms to achieve more efficient purging operations.

[0053] The beneficial effects of the above implementation are:

[0054] By refining the operation of step S5, the system can more precisely control the blowing direction and speed of the blower, ensuring that the hydrogen concentration can be quickly and effectively reduced to a safe range, thus improving the accuracy and efficiency of the purging operation.

[0055] The detailed working principle adopted in the above implementation is as follows:

[0056] The central control system adjusts the blower's rotation angle based on the location and extent of the hydrogen leak area and the relative position of the blower, ensuring the air outlet is aligned with the leak area. Simultaneously, it determines the concentration gradient based on the maximum and minimum hydrogen concentrations and adjusts the airflow accordingly. The system also monitors and dynamically adjusts the airflow in real time, records and analyzes the purging effect, and optimizes parameters through algorithms to achieve more efficient purging operations.

[0057] In a preferred implementation, in step S7, if the central control system detects hydrogen leaks at at least two locations, the following steps are further performed:

[0058] S7a. The central control system calculates and adjusts the rotation angle of the blowers based on the specific location and extent of the leak area and the relative position of each blower, so that the air outlet is aimed at the area with the highest concentration for purging.

[0059] S7b. The central control system determines the hydrogen concentration gradient based on the data fed back by the hydrogen concentration monitoring device, and adjusts the blower speed accordingly to ensure that the blower speed is proportional to the hydrogen concentration gradient.

[0060] S7c. If the hydrogen concentration at a leak point remains above the safety threshold, the central control system will automatically increase the wind speed of the blower at that point to quickly reduce the hydrogen concentration.

[0061] The S7d central control system records and analyzes the effect of each purging operation, and adjusts relevant parameters through optimization algorithms to achieve more efficient purging operations.

[0062] The beneficial effects of the above implementation are:

[0063] In the event of multiple leaks, the system can perform comprehensive assessments and adjustments, improving its ability to handle complex situations and ensuring the safe operation of hydrogen refueling stations. Even in emergency situations involving multiple leaks, it can quickly and effectively control hydrogen concentration and prevent accidents.

[0064] The detailed working principle adopted in the above implementation is as follows:

[0065] When the central control system detects multiple leaks, it conducts a comprehensive assessment based on the location, extent, and hydrogen concentration of each leak. The system calculates and adjusts the blower's rotation angle to target the area with the highest concentration for purging. Simultaneously, the system adjusts the airflow speed according to the concentration gradient, increasing it as needed to rapidly reduce the hydrogen concentration. The system also records and analyzes the effectiveness of each purging operation, optimizing algorithms to adjust parameters and achieve more efficient purging.

[0066] Compared with the prior art, the present invention has the following advantages:

[0067] Enhanced safety: The system can monitor the distribution of hydrogen leaks in real time through thermal imaging cameras, issue timely alarms, and control blowers to carry out purging operations, effectively reducing the probability of explosions caused by hydrogen leaks and improving the safety of hydrogen refueling stations.

[0068] Enhanced Response Capability: The central control system quickly receives signals from the thermal imaging camera to accurately identify the location of the leak and rapidly initiates purging operations, enabling the system to respond more quickly and take timely measures to reduce accident losses in the event of a hydrogen leak.

[0069] Reduced human intervention: Traditional explosion-proof systems often require manual intervention to start, while this system can achieve automated control without human intervention, reducing the impact of human factors on the system's response speed.

[0070] Improving production efficiency: The intelligence and automation of the explosion-proof system of hydrogen refueling stations can effectively reduce downtime and labor costs in the production process, thereby improving production efficiency and economic benefits.

[0071] Promoting the Development of the Hydrogen Energy Industry: Hydrogen refueling stations are a crucial component of the hydrogen energy industry chain, and safety issues directly impact the development of the entire industry. Therefore, developing an efficient and reliable explosion-proof system for hydrogen refueling stations is of great significance for promoting the healthy and sustainable development of the hydrogen energy industry.

[0072] In summary, the infrared thermal imaging detection and control system for purging and preventing explosions of hydrogen refueling station blowers is an innovative technology with significant background and importance. It will provide reliable protection for the safe operation of hydrogen refueling stations and promote the development of the hydrogen energy industry. This invention enables timely detection and rapid handling of hydrogen leaks at refueling stations, effectively improving the safety and stability of these stations and possessing broad application prospects. Attached Figure Description

[0073] Figure 1 An explosion-proof system for purging the blower of a hydrogen refueling station, controlled by infrared thermal imaging detection.

[0074] Figure 2 This refers to the control process of the central control system.

[0075] In the diagram: 1. Thermal imaging camera; 2. Central control system; 3. Control panel; 4. Alarm; 5. Hydrogen concentration monitoring device; 6. Blower; 7. High-pressure hydrogen storage tank. Detailed Implementation

[0076] To enable those skilled in the art to better understand the technical solution, the present invention will be described in detail below with reference to embodiments. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of the present invention in any way.

[0077] like Figure 1 As shown, the present invention provides an infrared thermal imaging detection and control system for purging explosion-proof hydrogen refueling station blowers, comprising: a thermal imaging camera 1; a central control system 2; a control panel 3; an alarm 4; a hydrogen concentration monitoring device 5; a blower 6; and a high-pressure hydrogen storage tank 7.

[0078] The thermal imaging camera 1 should detect hydrogen leakage by changing the heat around the hydrogen storage tank, and be used to monitor the distribution of hydrogen leakage in various areas of the hydrogen refueling station in real time. It will transmit the monitored signals to the central control system 2 and accurately locate the hydrogen leakage point, but it does not have the function of identifying the hydrogen leakage concentration value.

[0079] The central control system 2 bus communication should enable mutual access between the detector and the remote control terminal, be responsible for receiving signals from the thermal imaging camera 1, identify the leak location, control the alarm 4 to issue an alarm, and control the direction, wind speed and start / stop of the blower 6 to carry out purging operations.

[0080] The control panel 3 should have a WinCC flexible configuration human-machine interface, which can be used for manual operation and monitoring of the entire system's operating status, including the control of the blower 6 and other equipment, as well as visualization of hydrogen concentration and alarm status.

[0081] The alarm 4 should promptly respond to the signal from the central control system 2 and issue an alarm when the thermal imaging camera 1 detects hydrogen leakage or other sources of ignition, so as to remind relevant personnel to pay attention and take necessary safety measures.

[0082] The hydrogen concentration monitoring device 5 should monitor the changes in hydrogen concentration during the purging operation to ensure that the hydrogen concentration in the purging area reaches a safe value. It is also necessary to adjust the sensor output by exposing the sensor to a hydrogen environment of known concentration to match the actual concentration. The influence of temperature on sensor performance should be considered, and the sensor should be calibrated regularly with appropriate temperature compensation to prevent temperature changes from causing the sensor output to deviate and to ensure the accurate relationship between its output and the actual hydrogen concentration.

[0083] The blower 6 should have the capabilities of large air flow, high air pressure, high efficiency and multi-level wind speed, and should respond promptly to the instructions of the central control system 2 to rotate the angle and change the wind speed according to the range of hydrogen concentration in the area to quickly, efficiently and reasonably remove the leaked hydrogen and prevent the occurrence of explosion accidents.

[0084] The on / off control of the alarm 4 and blower 6 of the system should be controlled by the central control system 2. When the thermal imaging camera 1 and the hydrogen concentration monitoring device 5 detect that the environmental conditions have reached the set conditions, the on / off of the equipment will be automatically triggered.

[0085] The method for confirming the nearest blower 6 to the system leak point should be to divide the hydrogen storage tank placement area into 6 areas in advance. After the thermal imaging camera 1 transmits the leak point location information to the central control system 2, the central control system 2 sets the blowers 6 at the four corners of the leak area block to emergency status and controls the air outlet of the blowers 6 to rotate from the initial state perpendicular to the ground to the leak location by calculating the angle. When the hydrogen concentration monitoring device 5 detects that the hydrogen concentration in the environment reaches the threshold of 4%, the central control system 2 sets the four blowers 6 in emergency status to start status.

[0086] The system thermal imaging camera 1 should reflect the gas concentration differences in different areas, identify the location with the highest hydrogen concentration, and transmit the signal to the central control system 2. The central control system 2 calculates the angle between each blower 6 and the hydrogen leak point and controls the four blowers 6 to rotate in real time so that the air outlet is aligned with the area with the highest concentration. When the hydrogen concentration monitoring device 5 detects that the hydrogen concentration in the area exceeds 10%, the central control system 2 should set the blower 6 to the maximum wind speed and select the corresponding wind speed according to the range of the highest concentration.

[0087] When the hydrogen concentration sensor of the system detects that the highest hydrogen concentration is below 4%, the central control system 2 should set the alarm 4 and the blower 6 to be turned off and rotate the direction of the blower 6 back to the initial state so that the blower 6 can respond and adjust as quickly as possible when purging different leak areas in the future.

[0088] like Figure 1 System diagram and Figure 2 The control flowchart of the central control system is shown below. The specific implementation process of the hydrogen refueling station blower purging explosion-proof system with infrared thermal imaging detection and control proposed in this invention is as follows:

[0089] The first step is to assume that there are only 3 hydrogen refueling station storage tanks in this invention. The hydrogen refueling station storage tank area can be divided into six areas: A, B, C, D, E, and F. This invention does not require such division; the area division can be made reasonably according to the actual design.

[0090] The second step is to place the thermal imaging camera 1 outside the central control room, facing the area of ​​the high-pressure hydrogen storage tank 7. Before identifying and correcting the location of the hydrogen leak, the thermal imaging camera 1 first corrects the deviation of the sensor and the lens, then removes noise from the image and aligns the image to ensure that the position of each pixel remains consistent.

[0091] Third, when hydrogen leaks, the hydrogen will quickly diffuse into the surrounding environment and react with the air to generate heat or when other sources of ignition appear, the thermal imaging camera 1 will detect these tiny temperature changes and convert them into thermal images.

[0092] The fourth step involves the central control system 2 enhancing the contrast and clarity of the image after the thermal image is generated, improving the visualization effect, and finally detecting the edges and contours in the image, dividing the image into different regions, marking hot spots or regions, further analyzing the image, extracting key features and quantifying the heat distribution, and observing the temperature distribution and morphology in the thermal image.

[0093] Fifth step: If the central control system 2 identifies the heat image as showing an irregular or specific shape of heat distribution, the central control system 2 controls the alarm to issue an alarm to call staff to manually extinguish the fire.

[0094] Step 6: If the central control system 2 identifies a large and relatively regular hot spot in the thermal image, the central control system 2 displays the location and intensity of the hydrogen leak source, monitors the distribution of hydrogen leaks in various areas of the hydrogen refueling station in real time, and controls the alarm to issue a hydrogen leak alarm.

[0095] The seventh step is for the central control system 2 to perform time series analysis on the continuous thermal images generated by the thermal imaging camera 1 in order to capture the moving direction and speed of the detection hotspot and the diffusion of the hydrogen leak area, and to predict the heat change at the next moment through the current thermal images, providing a certain degree of prediction of the hydrogen leak direction.

[0096] Step 8, according to Figure 1 The corresponding blowers 6 are arranged in the area division, and the air outlet direction is perpendicular to the ground;

[0097] Step 9: After identifying the location of the hydrogen leak source, the central control system 2 sets the blowers 6 at the four corners of the leak area block to emergency status through the pre-set area division and controls the air outlets of the blowers 6 to rotate from the initial state perpendicular to the ground toward the leak location.

[0098] Step 10: Install a hydrogen concentration monitoring device 5 at the outer edge of each of the three areas B, D and F to monitor the changes in hydrogen concentration during the purging operation in real time and ensure that the hydrogen concentration in the area reaches a safe value after purging.

[0099] Step 11: When the hydrogen concentration monitoring device 5 detects that the hydrogen concentration in the environment reaches the threshold of 4% or more, the central control system 2 sets the four blowers 6 in the emergency state to start, and the blowers 6 are turned on to carry out purging operations.

[0100] In the twelfth step, the central control system 2 captures the area with the highest hydrogen concentration through the thermal image generated by the thermal imaging camera 1. Based on the relative position between the area with the highest hydrogen concentration and the position of the blower 6, and combined with the data provided by the predicted hydrogen direction, the central control system 2 calculates the angle at which the four blowers 6 should rotate so that they are directly facing the area with the highest concentration. When the hydrogen concentration monitoring device 5 detects that the hydrogen concentration in the area exceeds 10%, the central control system 2 sets the blower 6 to the maximum wind speed and selects the corresponding wind speed according to the range of the highest concentration.

[0101] Step 13: When the hydrogen concentration monitoring device 5 detects that the highest hydrogen concentration is below 4%, the central control system 2 sets the alarm 4 and the blower 6 to shut down and rotates the angle of the blower 6 back to its initial state so that the blower 6 can respond and adjust as quickly as possible when purging different leak areas in the future, and the system returns to normal operation.

[0102] The explosion-proof method for purging a hydrogen refueling station blower, which combines infrared thermal imaging detection and control, provided by this invention, includes the following steps:

[0103] S1. Thermal imaging camera 1 monitors the hydrogen refueling station area in real time;

[0104] S2. When at least two thermal imaging cameras 1 capture temperature change points within the same range, and the hydrogen concentration monitoring device 5 reports a change in hydrogen concentration, it is determined that there is a hydrogen leak in the area.

[0105] The specific judgment method is as follows:

[0106] When a thermal imaging camera 1 detects a temperature change point in an area, it transmits the data to the central control system 2. The central control system 2 then adjusts the angle of another thermal imaging camera 1 in the area of ​​the temperature change point to verify the area. At the same time, it also verifies the data based on the signal fed back by the hydrogen concentration monitoring device 5 in the area of ​​the temperature change point. When the verification is successful, it is determined that there is a hydrogen leak in the area.

[0107] When the hydrogen concentration monitoring device 5 detects a point of change in hydrogen concentration in a certain area, it transmits the data to the central control system 2. The central control system 2 adjusts the angle of at least two thermal imaging cameras 1 in the area of ​​the temperature change point to verify the area. When the verification is successful, it is determined that there is a hydrogen leak in the area.

[0108] S3. The central control system 2 analyzes the signal fed back by the thermal imaging camera 1 to obtain the specific location and extent of the leak area;

[0109] S4. The central control system 2 determines whether the concentration of leaked hydrogen has reached the set safety threshold based on the data fed back by the hydrogen concentration monitoring device 5. When the hydrogen concentration exceeds the safety threshold, the central control system 2 controls the alarm 4 to issue an alarm.

[0110] S5. When the hydrogen concentration exceeds the safety threshold, the central control system 2 calculates the rotation angle based on the specific location and range of the hydrogen leak area and the relative position of each blower 6, and controls the blower 6 to rotate in real time so that the air outlet is aimed at the area with the highest concentration for purging until the hydrogen concentration drops to a safe range.

[0111] S6. When the hydrogen concentration is lower than the safety threshold, the central control system 2 automatically deactivates the alarm and resets the system to standby mode;

[0112] S7. When the central control system 2 detects hydrogen leaks at no less than two locations, it conducts a comprehensive assessment based on the safety threshold and hydrogen concentration differences, and adjusts the blowing angle and force of the blower 6.

[0113] Specifically, when the hydrogen concentration monitoring device 5 detects that the hydrogen concentration in the area exceeds the safety threshold of 10%, the central control system 2 sets the blower 6 to the maximum speed and selects the corresponding wind speed according to the range of the highest concentration.

[0114] When the hydrogen concentration monitoring device 5 detects that the highest hydrogen concentration is below the safety threshold of 4%, the central control system 2 sets the alarm 4 and the blower 6 to shut down, and rotates the direction of the blower 6 back to its initial state, so that the blower 6 can respond and adjust as quickly as possible when purging different leak areas in the future.

[0115] As a preferred embodiment of the above, step S5 further includes the following steps:

[0116] S5a. The central control system 2 adjusts the rotation angle of the blower 6 according to the location and extent of the hydrogen leak area and the relative position of the blower 6 to ensure that the air outlet is aligned with the leak area.

[0117] S5b. The central control system 2 assesses the maximum and minimum values ​​of hydrogen concentration in the leak area based on the data fed back by the hydrogen concentration monitoring device 5, in order to determine the hydrogen concentration gradient.

[0118] S5c. Based on the hydrogen concentration gradient, the central control system 2 adjusts the wind speed of the blower 6 to ensure that the wind speed matches the hydrogen concentration gradient.

[0119] The S5d central control system 2 monitors the wind speed of the blower 6 in real time and dynamically adjusts the wind speed based on real-time hydrogen concentration data to ensure that the hydrogen concentration drops to a safe range. If the hydrogen concentration remains above the safe threshold, the wind speed is automatically increased.

[0120] The S5e. Central Control System 2 records and analyzes the effect of each purging operation, and adjusts relevant parameters through optimization algorithms to achieve more efficient purging operations.

[0121] Specifically, step S5 further includes the following steps:

[0122] S5a. Central control system 2, based on the specific location of the hydrogen leak area and range And the relative positions of each blower. Calculate the rotation angle of the blower. The formula is:

[0123]

[0124] in, Indicates the coordinates of the leak area. Represents the coordinates of the blower. This is the reference distance between the blower and the leak area.

[0125] S5b. The central control system 2 determines the hydrogen concentration gradient based on the data fed back by the hydrogen concentration monitoring device 5. The formula is:

[0126]

[0127] in, and These represent the maximum and minimum hydrogen concentrations within the leak area, respectively.

[0128] S5c. Based on the hydrogen concentration gradient The central control system 2 calculates the wind speed of the blower 6. The formula is:

[0129]

[0130] in, It is a proportionality constant. It is the power-law exponent between wind speed and concentration gradient.

[0131] S5d. Central control system 2 monitors the wind speed of blower 6 in real time. The wind speed is dynamically adjusted based on real-time hydrogen concentration data to ensure the hydrogen concentration drops to a safe level. If the hydrogen concentration remains above the safe threshold... The wind speed will automatically increase, as shown in the formula:

[0132]

[0133] in, It is the increase in wind speed, calculated based on the degree to which the hydrogen concentration exceeds the safety threshold.

[0134] S5e. Central Control System 2 records and analyzes the effect of each purging operation, and adjusts the algorithm accordingly. , and The value is adjusted to achieve more efficient purging operations.

[0135] Step S5 integrates advanced monitoring technology, intelligent control strategies, and precise mathematical calculations to achieve efficient and accurate handling of hydrogen leaks at hydrogen refueling stations. This technical solution aims to improve the intelligence level of hydrogen refueling station safety management, ensuring rapid and accurate safety assessments and response measures in complex and ever-changing leak situations through real-time monitoring and dynamic response mechanisms.

[0136] By capturing temperature changes in real time using infrared thermal imaging technology and combining this data with data from a hydrogen concentration monitoring device, rapid identification and precise location of the leak area were achieved. This step employed a mathematical formula to calculate a weighted average of the hydrogen concentration, considering not only the concentration values ​​at each leak point but also assigning weights to reflect the relative importance of each leak point, thus forming a comprehensive evaluation method.

[0137] This step uses the `arctan` function to calculate the blower's rotation angle, ensuring the accuracy of the purging direction. The dynamic safety threshold calculation formula enables real-time adjustment of safety standards, realizing a dynamic adjustment strategy. Furthermore, the wind speed calculation formula considers the hydrogen concentration gradient; by introducing a proportionality constant and a power-law exponent, the wind speed adjustment better reflects actual leakage conditions, improving purging efficiency.

[0138] As a preferred embodiment of the above, in step S7, when the central control system detects hydrogen leaks at at least two locations, the following steps are further performed:

[0139] S7a. The central control system calculates and adjusts the rotation angle of the blowers based on the specific location and extent of the leak area and the relative position of each blower, so that the air outlet is aimed at the area with the highest concentration for purging.

[0140] S7b. The central control system determines the hydrogen concentration gradient based on the data fed back by the hydrogen concentration monitoring device, and adjusts the blower speed accordingly to ensure that the blower speed is proportional to the hydrogen concentration gradient.

[0141] S7c. If the hydrogen concentration at a leak point remains above the safety threshold, the central control system will automatically increase the wind speed of the blower at that point to quickly reduce the hydrogen concentration.

[0142] The S7d central control system records and analyzes the effect of each purging operation, and adjusts relevant parameters through optimization algorithms to achieve more efficient purging operations.

[0143] Specifically, in step S7, when the central control system 2 detects hydrogen leaks at at least two locations, the following steps are further executed:

[0144] S7a. The central control system 2 calculates the weighted average hydrogen concentration at each leak point using the following formula:

[0145]

[0146] in, This represents the hydrogen concentration at the i-th leak point. The weights for the corresponding leak points are determined based on the relative importance or risk level of the leak points.

[0147] S7b. Based on weighted average concentration The central control system 2 determines a dynamic safety threshold. The formula is:

[0148]

[0149] in, The preset basic security threshold, The adjustment coefficient is determined based on the rate of change of hydrogen concentration.

[0150] S7c. Central Control System 2 according to and hydrogen concentration at each leak point The blowing angle and force of blower 6 are dynamically adjusted to ensure that the hydrogen concentration at all leak points is reduced to a minimum. The following applies if the hydrogen concentration at a certain leak point is... consistently higher Exceeding the preset time Then the wind speed of blower 6 at that point will automatically increase, according to the formula:

[0151]

[0152] in, The current wind speed, The adjusted wind speed. This is the wind speed adjustment coefficient.

[0153] S7d. The central control system 2 records the changes in hydrogen concentration at each leak point and the response of the blower 6 in real time, and continuously adjusts the system through optimization algorithms. and To achieve optimal purging effect and system response speed.

[0154] Step S7 comprehensively utilizes precise mathematical modeling, intelligent control strategies, and advanced monitoring technologies to achieve efficient management and control of hydrogen leaks at hydrogen refueling stations. First, infrared thermal imaging technology is used to monitor the temperature of the refueling station area in real time, quickly identifying potential hydrogen leak areas. Second, data collected by hydrogen concentration monitoring devices is used to accurately calculate the hydrogen concentration gradient and the required blower speed using advanced mathematical formulas. Specifically, the arctan function is used to determine the blower's rotation angle, ensuring precise alignment of the purging direction with the leak source. A proportionality constant and power law exponent are introduced to dynamically adjust the wind speed to adapt to leaks with different concentration gradients. A method for real-time monitoring and dynamic adjustment of wind speed based on real-time hydrogen concentration data is proposed, along with continuous adjustment of relevant parameters through optimization algorithms to achieve more efficient purging operations. This not only improves the system's response speed and processing capacity but also significantly enhances the safety management level of the hydrogen refueling station.

[0155] Example 1

[0156] Background setting:

[0157] The hydrogen refueling station has three hydrogen storage tanks, labeled A, B, and C. Each tank is responsible for two areas, for a total of six areas. Each area is equipped with several blowers and hydrogen concentration monitoring devices. Suppose that at a certain moment, a hydrogen leak is detected in area A of the storage tank.

[0158] Specific implementation steps:

[0159] 1. Hydrogen leak detection: The hydrogen concentration monitoring device shows that the hydrogen concentration in area A of the hydrogen storage tank is 6% VOL, which exceeds the preset safety threshold of 4% VOL.

[0160] 2. Blower rotation angle calculation: The central control system calculates the angle based on the leakage area. The coordinates (0,0) and the blower The coordinates (10,0) and the reference distance. Meters, calculate the required rotation angle of the blower. :

[0161]

[0162] Calculation -45° means that the blower needs to rotate 45° counterclockwise.

[0163] 3. Hydrogen concentration gradient calculation: The central control system calculates the hydrogen concentration gradient. :

[0164]

[0165] 4. Blower speed calculation: based on hydrogen concentration gradient Calculate the blower's wind speed Set the proportional constant Power Law Index :

[0166]

[0167] 5. Fan Speed ​​Adjustment: If the hydrogen concentration does not drop below the safety threshold, the central control system will adjust the fan speed according to the degree to which the hydrogen concentration exceeds the safety threshold. Setting the fan speed requires adding... :

[0168]

[0169] specific The value can be calculated and determined based on the actual situation.

[0170] Data recording and verification:

[0171] time Leakage area Concentration (%VOL) Wind speed (m / s) Adjust the angle (°) Concentration gradient (%VOL / m) Wind speed adjustment (ΔV) T0 Hydrogen storage tank A 6.0 0.04 -45 0.2 - T1 Hydrogen storage tank A 4.0 - - - Adjust as needed

[0172] By adjusting the angle and speed of the blower, the hydrogen concentration was reduced from 6% VOL to 4% VOL, proving that the system can effectively control hydrogen leakage.

[0173] Example 2

[0174] Background setting:

[0175] During the operation of the hydrogen refueling station, hydrogen leaks were detected simultaneously in hydrogen storage tanks B and C, requiring comprehensive assessment and handling by the central control system.

[0176] Specific implementation steps:

[0177] 1. Multiple leak point detection: The hydrogen concentration in area B of hydrogen storage tank is 5% VOL, and the hydrogen concentration in area C of hydrogen storage tank is 7% VOL.

[0178] 2. Weighted average concentration calculation: The central control system calculates the weighted average concentration. The weights of hydrogen storage tanks B and C are set to 1 and 2, respectively:

[0179]

[0180] 3. Dynamic safety threshold calculation: Calculate the dynamic safety threshold based on the weighted average concentration. Set basic security thresholds Adjustment coefficient :

[0181]

[0182] 4. Blower speed adjustment: If the hydrogen concentration at a leak point remains consistently higher than... The central control system will automatically increase the blower speed at that point. Set the wind speed adjustment coefficient. :

[0183]

[0184] specific and The value is determined based on the actual situation.

[0185] Data recording and verification:

[0186] time Leaking hydrogen storage tank Concentration (%VOL) Weight Weighted concentration (%VOL) Dynamic security threshold (%VOL) Wind speed adjustment factor (β) Adjusted wind speed (m / s) T0 Hydrogen storage tank B 5 1 5 4.4 - <![CDATA[Determine according to V old Determine]]> T0 Hydrogen storage tank C 7 2 14 T1 average - - 6 4.4 0.2 Calculate according to the formula

[0187] By adjusting the wind speed and direction, the hydrogen concentration in hydrogen storage tanks B and C both dropped below the dynamic safety threshold of 4.4% VOL, proving that the system is effective in handling multiple leak points.

[0188] It should be noted that, in this document, the terms "comprising," "including," and any other variations are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Specific examples have been used in this document to illustrate the principles and implementation methods of the present invention. These examples are merely for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be pointed out that, due to the limitations of written expression and the objective existence of infinite specific structures, those skilled in the art can make several improvements, modifications, or variations without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, variations, or combinations, or the direct application of the concept and technical solution of the present invention to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A method for explosion-proof purging of a hydrogen refueling station blower using infrared thermal imaging detection and control, characterized in that, The system used in the method includes: A thermal imaging camera (1) covers the area of ​​the hydrogen refueling station and is used to monitor the temperature changes around the hydrogen storage tank of the hydrogen refueling station in real time; Blowers (6) are distributed in a matrix around the hydrogen storage tank of the hydrogen refueling station, and directionally purge the leak area according to the instructions of the central control system (2); The hydrogen concentration monitoring device (5) is used to monitor the hydrogen concentration around the hydrogen storage tank and the purging area of ​​the hydrogen refueling station in real time, and to feed back the concentration data to the central control system (2). The alarm (4) is activated by the central control system (2) when the hydrogen concentration reaches the preset safety threshold. The control panel (3) has a human-machine interface for manual operation and monitoring of the system's operating status, including control of the blower (6) and the alarm (4); The central control system (2) receives the monitoring signal transmitted by the infrared thermal imaging camera (1) and the signal from the hydrogen concentration monitoring device (5), processes the signal to identify the location and status of the hydrogen leak, and controls the start and stop of the alarm (4) and the direction, wind speed and start and stop of the blower (6) to carry out purging operations according to the location and status of the hydrogen leak. The method includes the following steps: S1. Thermal imaging camera (1) monitors the hydrogen refueling station area in real time; S2. When at least two thermal imaging cameras (1) capture the same temperature change point and the hydrogen concentration monitoring device (5) reports a change in hydrogen concentration, it is determined that there is a hydrogen leak in the area. The specific judgment method for S2 is as follows: When a thermal imaging camera (1) detects a temperature change point in the area, it transmits the data to the central control system (2); the central control system (2) adjusts the angle of another thermal imaging camera (1) in the area of ​​the temperature change point to verify the area, and at the same time verifies the signal fed back by the hydrogen concentration monitoring device (5) in the area of ​​the temperature change point; when the verification is successful, it is determined that there is a hydrogen leak in the area. When the hydrogen concentration monitoring device (5) detects a point of change in hydrogen concentration in a certain area, it transmits the data to the central control system (2); the central control system (2) adjusts the angle of at least two thermal imaging cameras (1) in the area of ​​the temperature change point to verify the area; when the verification is successful, it is determined that there is a hydrogen leak in the area. S3. The central control system (2) analyzes the signal fed back by the thermal imaging camera (1) to obtain the specific location and range of the leak area; S4. The central control system (2) determines whether the concentration of leaked hydrogen has reached the set safety threshold based on the data fed back by the hydrogen concentration monitoring device (5). When the hydrogen concentration exceeds the safety threshold, the central control system (2) controls the alarm (4) to issue an alarm. S5. When the hydrogen concentration exceeds the safety threshold, the central control system (2) calculates the rotation angle based on the specific location and range of the hydrogen leak area and the relative position of each blower (6) to control the blower (6) to rotate in real time, so that the air outlet is aimed at the area with the highest concentration for purging until the hydrogen concentration drops to the safe range. S6. When the hydrogen concentration is lower than the safety threshold, the central control system (2) automatically deactivates the alarm and resets the system to standby mode; S7. When the central control system (2) finds hydrogen leaks in at least two locations, it makes a comprehensive assessment based on the safety threshold and hydrogen concentration differences, and adjusts the blowing angle and force of the blower (6).

2. The method according to claim 1, characterized in that, The thermal imaging camera (1) is a 25mm thermal imaging dual-spectrum tube-type network camera with a resolution of 640×512, 4 million visible light pixels, and an infrared light illumination distance of up to 100 meters.

3. The method according to claim 1, characterized in that, The bus communication of the central control system (2) adopts the MODBUS_RTU fieldbus protocol to realize mutual access between the detector and the remote control terminal.

4. The method according to claim 1, characterized in that, The alarm (4) uses an electromagnetic active buzzer of model HTY-1205.

5. The method according to claim 1, characterized in that, The hydrogen concentration monitoring device (5) uses a MAX250B sensor with a measurement range of 0~100%VOL, a resolution of ±1%, a response time of <15s, and an accuracy of ±1%; it is used to monitor the changes in hydrogen concentration during the purging operation to ensure that the hydrogen concentration in the purging area reaches a safe value.

6. The method according to claim 1, characterized in that, When the hydrogen concentration monitoring device (5) detects that the hydrogen concentration in the area exceeds the safety threshold of 10%, the central control system (2) sets the blower (6) to the maximum wind speed and selects the corresponding wind speed according to the range of the highest concentration. When the hydrogen concentration monitoring device (5) detects that the highest hydrogen concentration is lower than the safety threshold of 4%, the central control system (2) sets the alarm (4) and the blower (6) to shut down, and rotates the orientation of the blower (6) back to the initial state so that the blower (6) can respond and adjust as quickly as possible when purging different leak areas in the future.

7. The method according to claim 1, characterized in that, Step S5 further includes the following steps: S5a. The central control system (2) adjusts the rotation angle of the blower (6) according to the location and extent of the hydrogen leak area and the relative position of the blower (6) to ensure that the air outlet is aligned with the leak area; S5b. The central control system (2) evaluates the maximum and minimum values ​​of hydrogen concentration in the leak area based on the data fed back by the hydrogen concentration monitoring device (5) in order to determine the hydrogen concentration gradient; S5c. Based on the hydrogen concentration gradient, the central control system (2) adjusts the wind speed of the blower (6) to ensure that the wind speed matches the hydrogen concentration gradient; S5d. The central control system (2) monitors the wind speed of the blower (6) in real time and dynamically adjusts the wind speed according to the real-time data of hydrogen concentration to ensure that the hydrogen concentration drops to a safe range; if the hydrogen concentration continues to be higher than the safe threshold, the wind speed will be automatically increased. S5e. The central control system (2) records and analyzes the effect of each purging operation, and adjusts relevant parameters through optimization algorithms to achieve more efficient purging operations.

8. The method according to claim 1, characterized in that, In step S7, when the central control system (2) detects hydrogen leaks at at least two locations, the following steps are further performed: S7a. The central control system (2) calculates and adjusts the rotation angle of the blowers (6) according to the specific location and range of the leak area and the relative position of each blower (6) so that the air outlet is aimed at the area with the highest concentration for purging. S7b. The central control system (2) determines the hydrogen concentration gradient based on the data fed back by the hydrogen concentration monitoring device (5), and adjusts the wind speed of the blower (6) accordingly to ensure that the wind speed is proportional to the hydrogen concentration gradient. S7c. If the hydrogen concentration at a leak point continues to be higher than the safety threshold, the central control system (2) will automatically increase the wind speed of the blower (6) at that point to quickly reduce the hydrogen concentration; S7d. The central control system (2) records and analyzes the effect of each purging operation, and adjusts relevant parameters through optimization algorithms to achieve more efficient purging operations.

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