Hydrogen pipeline conveying sealing anti-leakage detection system

Abstract

The invention relates to the field of hydrogen pipeline conveying sealing and leak-proof detection, and discloses a hydrogen pipeline conveying sealing and leak-proof detection system, which comprises an ultrasonic flowmeter arranged in a hydrogen conveying pipeline and used for acquiring flow velocity data of hydrogen in the pipeline in real time; the electromagnetic valve is arranged at a pipeline key node and cuts off hydrogen supply after receiving the valve closing instruction; the alarm subsystem comprises a sound-light alarm device, a mobile terminal and a cloud monitoring platform; the emergency response unit comprises an intelligent fan, a concentration sensor and a redundant communication module; the data processor is configured to dynamically judge that the leakage level is a low level, a middle level or a high level according to the flow velocity data and a preset leakage judgment condition; compared with the prior art, the method has the advantages that the problems of low sensitivity and high misjudgment rate in the prior art are solved by optimizing a flow velocity judgment algorithm, dynamically calibrating parameters and a hierarchical response mechanism.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen pipeline transportation sealing and anti-leakage detection, and in particular to a hydrogen pipeline transportation sealing and anti-leakage detection system. Background Art

[0002] Hydrogen is a transparent, colorless gas that is highly flammable, has no pungent odor, and has very low water solubility. Its transportation process places extremely high demands on pipeline sealing performance. Industrial hydrogen pipelines are characterized by high pressure (1-10MPa), large diameter (DN100-DN1000), and continuous operation, and the risk of leakage is much higher than that of civil pipelines. Traditional detection methods rely on pressure sensors or infrared spectrometers, which have the following defects:

[0003] (1) Response delay: The pressure change needs to accumulate to the threshold, and small leaks cannot be detected;

[0004] (2) Environmental interference: Industrial vibration and temperature fluctuations lead to high false alarm rates of sensors;

[0005] (3) Insufficient emergency response: There is a lack of a graded response mechanism, which makes it difficult to match the severity of the leak. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the above technical difficulties and provide a hydrogen pipeline transportation sealing and anti-leakage detection system, which solves the problems of low sensitivity and high misjudgment rate of the prior art by optimizing the flow rate determination algorithm, dynamic calibration parameters and graded response mechanism.

[0007] In order to solve the above technical problems, the technical solution provided by the present invention is: a hydrogen pipeline transportation sealing and anti-leakage detection system, comprising:

[0008] Ultrasonic flow meter, built into the hydrogen delivery pipeline, used to collect real-time flow rate data of hydrogen in the pipeline;

[0009] Solenoid valves are installed at key nodes of the pipeline to cut off the hydrogen supply after receiving the valve closing command;

[0010] Alarm subsystem, including sound and light alarm devices, mobile terminals and cloud monitoring platform;

[0011] Emergency response unit, including smart fans, concentration sensors and redundant communication modules;

[0012] a data processor configured to dynamically determine the leakage level as low, medium or high based on the flow rate data and a preset leakage determination condition;

[0013] The leakage determination conditions include:

[0014] Low-level leakage: When the flow rate data reaches the first time threshold T 1(1min) within the first value interval V 1 (0<υ<0.01m / s);

[0015] Intermediate leakage: When the flow rate data is within the second time threshold T 2 (2min) within the second value interval V 2 (0.01≤υ<0.1m / s);

[0016] Advanced Leakage: Meets any of the following conditions:

[0017] a) The flow rate is at the third time threshold T 3 (5min) in the third value interval V 3 (0.1≤υ<5m / s) and in the non-transportation period;

[0018] b) The flow rate is at the fourth time threshold T 4 (3min) in the fourth value interval V 4 (5≤υ<20m / s);

[0019] c) The instantaneous flow rate exceeds the high-level leakage threshold V max (20m / s);

[0020] The alarm subsystem performs a graded response:

[0021] In case of low-level leakage, early warning information is sent to mobile terminals;

[0022] In case of intermediate leakage, an audible and visual alarm is triggered and data is uploaded to the cloud platform;

[0023] In case of high-level leakage, the solenoid valve is closed, the intelligent fan is started, and the pipeline location and leakage level are sent to the emergency center through the redundant communication module;

[0024] The duration of the intermediate leakage exceeds the fifth time threshold T 5 (30min), the solenoid valve is closed synchronously and a maintenance work order is generated.

[0025] As an improvement, the first value interval V 1 The upper limit value is calculated according to the following formula:

[0026]

[0027] Among them, Q max The maximum leakage balance for hydrogen free diffusion in open space (5dm 3 / h), D is the inner diameter of the pipe;

[0028] The second to fourth value intervals and V maxDynamic calibration is based on the power of industrial hydrogen equipment (100-5000kW), low calorific value of hydrogen (120MJ / kg), pipeline pressure (1-10MPa) and lower explosion limit (4% volume concentration).

[0029] As an improvement, the non-delivery period is determined by:

[0030] (1) Extract daily low-load periods based on statistical analysis of historical transmission data;

[0031] (2) Receive shutdown maintenance instructions sent by the dispatching system;

[0032] (3) The delivery probability of future time periods is predicted through a machine learning model, and when the probability is less than 5%, it is marked as a non-delivery period.

[0033] As an improvement, the intelligent fan is configured to adjust the rotation speed according to the leakage level to ensure that the hydrogen concentration around the leakage point is lower than 10% of the lower explosion limit (i.e. <0.4% volume concentration), and is linked with the concentration sensor to automatically shut down the fan when the concentration drops to a safe threshold.

[0034] As an improvement, the cloud monitoring platform includes:

[0035] Data storage module, recording the flow rate, pressure and leakage events of all pipeline nodes;

[0036] Visual map module, showing leak location, level and emergency equipment status in real time;

[0037] The predictive analysis module uses time series data to train models, predict leakage risks and trigger warnings in advance.

[0038] As an improvement, the redundant communication module supports optical fiber, 5G and satellite communications to ensure that alarm signals and control commands can still be transmitted in extreme environments.

[0039] As an improvement, the data processor has a built-in vibration compensation algorithm to eliminate the interference of industrial environment vibration on the ultrasonic flowmeter's collected data.

[0040] The advantages of the present invention compared with the prior art are:

[0041] (1) Through graded judgment, the system can more finely distinguish leaks of different severity levels, avoiding treating all leaks as the same level, thereby improving the accuracy of detection.

[0042] (2) By setting a time threshold (e.g., a leak is judged as a certain level only when it lasts for a certain period of time), false alarms caused by instantaneous flow fluctuations can be reduced. At the same time, dynamically adjusting the threshold (e.g., based on pipeline pressure or environmental parameters) can adapt to different working conditions and reduce the risk of missed detection.

[0043] (3) Only early warning is sent for low-level leaks, rather than frequently starting and stopping the solenoid valve, reducing mechanical wear. This greatly improves the maintenance cycle and reduces annual maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 The present invention is a block diagram of a hydrogen pipeline transportation sealing and anti-leakage detection system. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0046] Example 1

[0047] According to the instruction manual Figure 1 The hydrogen pipeline transportation sealing and anti-leakage detection system comprises:

[0048] Ultrasonic flow meter, built into the hydrogen delivery pipeline, used to collect real-time flow rate data of hydrogen in the pipeline;

[0049] Solenoid valves are installed at key nodes of the pipeline to cut off the hydrogen supply after receiving the valve closing command;

[0050] The alarm subsystem includes an audible and visual alarm device, a mobile terminal and a cloud monitoring platform. The cloud monitoring platform includes:

[0051] Data storage module, recording the flow rate, pressure and leakage events of all pipeline nodes;

[0052] Visual map module, showing leak location, level and emergency equipment status in real time;

[0053] The predictive analysis module uses time series data to train models, predict leakage risks and trigger warnings in advance.

[0054] Emergency response unit, including smart fans, concentration sensors and redundant communication modules. The redundant communication modules support optical fiber, 5G and satellite communications to ensure that alarm signals and control commands can still be transmitted in extreme environments;

[0055] The data processor is configured to dynamically determine the leakage level as low, medium or high based on the flow rate data and the preset leakage determination conditions. The data processor has a built-in vibration compensation algorithm to eliminate the interference of industrial environment vibration on the ultrasonic flow meter's collected data.

[0056] The leakage determination conditions include:

[0057] Low-level leakage: When the flow rate data reaches the first time threshold T 1 (1min) within the first value interval V 1 (0<υ<0.01m / s);

[0058] Intermediate leakage: When the flow rate data is within the second time threshold T 2 (2min) within the second value interval V 2 (0.01≤υ<0.1m / s);

[0059] Advanced Leakage: Meets any of the following conditions:

[0060] a) The flow rate is at the third time threshold T 3 (5min) in the third value interval V 3 (0.1≤υ<5m / s) and in the non-transportation period;

[0061] b) The flow rate is at the fourth time threshold T 4 (3min) in the fourth value interval V 4 (5≤υ<20m / s);

[0062] c) The instantaneous flow rate exceeds the high-level leakage threshold V max (20m / s);

[0063] The first numerical interval V 1 The upper limit value is calculated according to the following formula:

[0064]

[0065] Among them, Q max The maximum leakage balance for hydrogen free diffusion in open space (5dm 3 / h), D is the inner diameter of the pipe;

[0066] The second to fourth value intervals and V max Dynamic calibration is based on the power of industrial hydrogen equipment (100-5000kW), low calorific value of hydrogen (120MJ / kg), pipeline pressure (1-10MPa) and lower explosion limit (4% volume concentration).

[0067] The non-delivery period is determined by:

[0068] (1) Extract daily low-load periods based on statistical analysis of historical transmission data;

[0069] (2) Receive shutdown maintenance instructions sent by the dispatching system;

[0070] (3) The delivery probability of future time periods is predicted through a machine learning model, and when the probability is less than 5%, it is marked as a non-delivery period.

[0071] The alarm subsystem performs a graded response:

[0072] In case of low-level leakage, early warning information is sent to mobile terminals;

[0073] In case of intermediate leakage, an audible and visual alarm is triggered and data is uploaded to the cloud platform;

[0074] In case of high-level leakage, the solenoid valve is closed, the intelligent fan is started, and the pipeline location and leakage level are sent to the emergency center through the redundant communication module. The intelligent fan is configured to adjust the speed according to the leakage level to ensure that the hydrogen concentration around the leakage point is lower than 10% of the lower explosion limit (i.e. <0.4% volume concentration), and is linked with the concentration sensor to automatically shut down the fan when the concentration drops to the safety threshold.

[0075] The duration of the intermediate leakage exceeds the fifth time threshold T 5 (30min), the solenoid valve is closed synchronously and a maintenance work order is generated.

[0076] Example 2

[0077] Take the DN500 high-pressure hydrogen pipeline (pressure 5MPa) as an example:

[0078] Low level leakage threshold V 1 :

[0079] Q max =5dm 3 / h,D=0.5m,

[0080] Advanced Leak Threshold Vmax:

[0081] Based on the pipeline pressure limit and the speed of sound of hydrogen (1310m / s), Vmax=20m / s is set (safety margin of 65 times).

[0082] Embodiment 3: Vibration compensation algorithm

[0083] The data processor has a built-in FFT (Fast Fourier Transform) algorithm to separate industrial vibration noise (frequency 10-100Hz) from flow rate signals, improving the accuracy of ultrasonic flow meters to ±0.5%.

[0084] Example 4: Cloud-based predictive analysis

[0085] The cloud platform uses an LSTM neural network, inputs historical flow rate, pressure, and temperature data, and outputs the probability of leakage in the next 10 minutes with an accuracy rate of ≥92%.

[0086] The present invention has been applied to the hydrogen transmission trunk line of a hydrogen energy base, successfully detecting tiny leaks at the 0.005m / s level. The emergency response time is shortened by 70% compared with the traditional system, significantly improving the safety of the industrial hydrogen pipeline network.

[0087] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

[0088] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0089] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0090] The present invention and its embodiments are described above, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it and do not deviate from the purpose of the invention, they can creatively design a structure and embodiment similar to the technical solution, which should fall within the protection scope of the present invention.

Claims

1. A hydrogen pipeline transportation sealing and anti-leakage detection system, characterized in that: include: Ultrasonic flow meter, built into the hydrogen delivery pipeline, used to collect real-time flow rate data of hydrogen in the pipeline; Solenoid valves are installed at key nodes of the pipeline to cut off the hydrogen supply after receiving the valve closing command; Alarm subsystem, including sound and light alarm devices, mobile terminals and cloud monitoring platform; Emergency response unit, including smart fans, concentration sensors and redundant communication modules; a data processor configured to dynamically determine the leakage level as low, medium or high based on the flow rate data and a preset leakage determination condition; The leakage determination conditions include: Low-level leakage: when the flow rate data is continuously in the first value interval V1 (0<υ<0.01m / s) within the first time threshold T1 (1min); Intermediate leakage: when the flow rate data is continuously in the second value interval V2 (0.01≤υ<0.1m / s) within the second time threshold T2 (2min); Advanced Leakage: Meets any of the following conditions: a) the flow rate is within the third value interval V3 (0.1≤υ<5m / s) within the third time threshold T3 (5min) and is in the non-delivery period; b) the flow velocity is within the fourth value interval V4 (5≤υ<20m / s) within the fourth time threshold T4 (3min); c) The instantaneous flow rate exceeds the high-level leakage threshold V max (20m / s); The alarm subsystem performs a graded response: In case of low-level leakage, early warning information is sent to mobile terminals; In case of intermediate leakage, an audible and visual alarm is triggered and data is uploaded to the cloud platform; In case of high-level leakage, the solenoid valve is closed, the intelligent fan is started, and the pipeline location and leakage level are sent to the emergency center through the redundant communication module; When the duration of the intermediate leakage exceeds the fifth time threshold T5 (30 min), the solenoid valve is closed synchronously and a maintenance work order is generated.

2. A hydrogen pipeline transportation sealing and anti-leakage detection system according to claim 1, characterized in that: The upper limit value of the first numerical interval V1 is calculated according to the following formula: Among them, Q max The maximum leakage balance for free diffusion of hydrogen in open space (5dm 3 / h), D is the inner diameter of the pipe; The second to fourth value intervals and V max Dynamic calibration is based on the power of industrial hydrogen equipment (100-5000kW), low calorific value of hydrogen (120MJ / kg), pipeline pressure (1-10MPa) and lower explosion limit (4% volume concentration).

3. A hydrogen pipeline transportation sealing and anti-leakage detection system according to claim 1, characterized in that: The non-delivery period is determined by: (1) Extract daily low-load periods based on statistical analysis of historical transmission data; (2) Receive shutdown maintenance instructions sent by the dispatching system; (3) The delivery probability of future time periods is predicted through a machine learning model, and when the probability is less than 5%, it is marked as a non-delivery period.

4. A hydrogen pipeline transportation sealing and anti-leakage detection system according to claim 1, characterized in that: The intelligent fan is configured to adjust the rotation speed according to the leakage level to ensure that the hydrogen concentration around the leakage point is lower than 10% of the lower explosion limit (i.e. <0.4% volume concentration), and is linked with the concentration sensor to automatically shut down the fan when the concentration drops to the safety threshold.

5. A hydrogen pipeline transportation sealing and anti-leakage detection system according to claim 1, characterized in that: The cloud monitoring platform includes: Data storage module, recording the flow rate, pressure and leakage events of all pipeline nodes; Visual map module, showing leak location, level and emergency equipment status in real time; The predictive analysis module uses time series data to train models, predict leakage risks and trigger warnings in advance.

6. A hydrogen pipeline transportation sealing and anti-leakage detection system according to claim 1, characterized in that: The redundant communication module supports optical fiber, 5G and satellite communications, ensuring that alarm signals and control commands can still be transmitted in extreme environments.

7. A hydrogen pipeline transportation sealing and anti-leakage detection system according to claim 1, characterized in that: The data processor has a built-in vibration compensation algorithm to eliminate the interference of industrial environment vibration on the data collected by the ultrasonic flow meter.

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