Alarm and interlocking protection system for hydrogen detection vehicle

Abstract

The invention relates to an alarm and chain protection system for a hydrogen detection vehicle, which comprises a combustible gas detection sensor, a combustible gas detector and a PLC (Programmable Logic Controller) monitoring and recording system which are connected in sequence, and an alarm system and a chain protection system which are respectively in communication connection with the PLC monitoring and recording system, the alarm system is respectively controlled by the PLC monitoring and recording system to start or stop working, and comprises an in-vehicle audible and visual alarm and a remote DCS (Distributed Control System) alarm system which are respectively in communication connection with the PLC monitoring and recording system; and the interlocking protection system comprises an automatic closing device, an emergency cut-off system, a ventilation system and a fire extinguishing system which are respectively in communication connection with the PLC monitoring and recording system. The sensor technology, the automatic control technology and the safety management concept are combined, and important guarantee is provided for on-site hydrogen quality detection of the hydrogen refueling station.

Description

Technical Field

[0001] The invention relates to an alarm and protection structure for a combustible gas detection vehicle, and in particular discloses an alarm and interlocking protection system for a hydrogen detection vehicle. Background Art

[0002] As a clean energy and industrial gas, hydrogen has been widely used in many industries such as chemical industry, metallurgy, electronics, food, energy, etc., and has broad application prospects, especially in the fields of hydrogen-powered vehicles and fuel cells. However, hydrogen is inherently highly flammable and explosive, with a low lower explosion limit (4%VOL) and a fast diffusion rate. Once leaked, it is very easy to form an explosive mixture, which poses a high safety risk.

[0003] Countries have strict safety regulations and standards for the transportation and storage of hazardous chemicals, such as the United States' NFPA2 Hydrogen Technical Specification and China's "Gas Cylinder Safety Technical Supervision Regulations", which require the standardization of safety measures during the use of hydrogen. Modern safety management systems also require companies to predict and prevent potential dangers, and put forward higher requirements for the monitoring and emergency response of hydrogen leaks.

[0004] As a clean energy source, the application of hydrogen helps reduce the emission of greenhouse gases such as carbon dioxide, which is in line with the global environmental protection trend, but safety issues are the premise of the widespread application of hydrogen energy. Hydrogen leaks and accidents will not only cause casualties, but also cause huge economic losses. In order to cope with the potential high danger of hydrogen and ensure safety during transportation and storage, hydrogen refueling stations have strict requirements on hydrogen quality, and the quality of external hydrogen must meet the requirements of GB / T 37244. Using a hydrogen detection vehicle to test hydrogen quality at the hydrogen refueling station is a quick and convenient detection method, but if hydrogen leaks and explodes in the hydrogen detection vehicle during the test, the consequences will be disastrous. Therefore, an effective alarm and protection system needs to be designed for the hydrogen detection vehicle to reduce the probability of accidents and further reduce the company's operating risks and economic losses.

[0005] At present, the technology of hydrogen detection vehicles on the market is still in its infancy, and only has leakage alarm protection measures, and there is no better explosion-proof means to avoid hydrogen explosion accidents. Summary of the invention

[0006] The purpose of the present invention is to solve the problems existing in the prior art and to design an alarm and interlocking protection system for a hydrogen detection vehicle, which combines sensor technology, automatic control technology and safety management concepts to ensure the safety of the hydrogen detection vehicle during hydrogen purging and testing, prevent explosion accidents caused by hydrogen leakage, and provide important guarantee for the safe use of hydrogen.

[0007] The present invention is implemented as follows: an alarm and interlocking protection system for a hydrogen detection vehicle, characterized in that the alarm and interlocking protection system includes a combustible gas detection sensor, a combustible gas detector and a PLC monitoring and recording system connected in sequence, and an alarm system and an interlocking protection system respectively connected to the PLC monitoring and recording system in communication, the combustible gas detection sensor is arranged in the positive pressure control cavity of the detection equipment in the hydrogen detection vehicle, and is connected to the combustible gas detector through a data transmission line, the combustible gas detector is connected to the PLC monitoring and recording system arranged in the positive pressure control cavity of the detection equipment through a communication cable, the interlocking protection system includes an automatic closing device, an emergency shut-off system, a ventilation system and a fire extinguishing system respectively connected to the PLC monitoring and recording system in communication, the automatic closing device, the emergency shut-off system, the ventilation system and the fire extinguishing system are respectively controlled to start or stop working by the PLC monitoring and recording system, the automatic closing device is arranged at the hydrogen sample inlet end of the detection equipment, the emergency shut-off system is used to control the power consumption of the detection equipment, and is arranged in the positive pressure control cavity of the detection equipment, and the fire extinguishing system is arranged on the top of the vehicle.

[0008] The combustible gas detector uploads the hydrogen concentration value measured in real time by the combustible gas detection sensor to the PLC monitoring and recording system. When the real-time measured hydrogen concentration value is greater than or equal to the alarm threshold set in the combustible gas detector, the detection result is judged to be that the hydrogen concentration exceeds the standard.

[0009] The PLC monitoring and recording system is provided with a real-time monitoring system and a data recording system, and the monitoring system records all data information of the entire alarm and interlocking protection system working process.

[0010] The alarm system includes an in-vehicle sound and light alarm and a remote DCS alarm system, which are respectively connected to the PLC monitoring and recording system, and are controlled to be activated by the PLC monitoring and recording system when hydrogen leakage occurs or the hydrogen concentration exceeds the standard. The activation of the in-vehicle sound and light alarm is used to remind the operator on the inspection vehicle, and the remote DCS alarm system is used to send the alarm signal to the remote monitoring center, which records the relevant information of the alarm signal for later remote reference.

[0011] The automatic closing device is used to close the valve of the hydrogen sampling gas source of the detection equipment when the hydrogen concentration exceeds the standard. The emergency shut-off system is used to cut off the power supply to the hydrogen detection circuit of the detection equipment when the hydrogen concentration exceeds the standard. The ventilation system is used to replace the air in the vehicle. When the ventilation system fails to control the hydrogen concentration in the vehicle below the alarm threshold within 5 minutes, the PLC monitoring and recording system triggers the fire extinguishing system to start the fire extinguishing work.

[0012] The beneficial effects of the present invention are as follows: during the on-site hydrogen quality test at the hydrogen refueling station, the present invention ensures the safety of the on-site test, avoids hydrogen leakage and explosion accidents in the detection vehicle, and can automatically start the interlocking protection system when dangerous situations such as hydrogen leakage occur, close the hydrogen valve, start the ventilation system, and cut off the power supply. When the ventilation system fails to control the hydrogen concentration in the vehicle below the alarm threshold within 5 minutes, the PLC monitoring and recording system triggers the fire extinguishing system, and the fire extinguishing system installed on the top of the vehicle is started, which effectively reduces the accident rate, improves the emergency response capability of the entire system, and ensures the safety of personnel and the environment during the detection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the connection structure of various components of the present invention.

[0014] In the figure: 1. Combustible gas detection sensor; 2. Combustible gas detector; 3. In-vehicle sound and light alarm; 4. Remote DCS alarm system; 5. Automatic shutdown device; 6. Emergency shut-off system; 7. Ventilation system; 8. PLC monitoring and recording system; 9. Fire extinguishing system. DETAILED DESCRIPTION

[0015] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0016] According to the attached Figure 1The present invention is an alarm and interlocking protection system for a hydrogen detection vehicle, comprising a combustible gas detection sensor 1, a combustible gas detector 2 and a PLC monitoring and recording system 8 connected in sequence, and an alarm system and an interlocking protection system respectively connected to the PLC monitoring and recording system 8 in communication. The combustible gas detection sensor 1 is arranged in the positive pressure control chamber of the detection equipment in the hydrogen detection vehicle, and is connected to the combustible gas detector 2 through a data transmission line. The combustible gas detector 2 is connected to the PLC monitoring and recording system 8 through a communication cable. The PLC monitoring and recording system 8 is provided with a real-time monitoring system and a data recording system. The monitoring system records all data information of the entire alarm and interlocking protection system working process for subsequent analysis and improvement. The alarm system comprises an in-vehicle sound and light alarm 3 and a remote DCS alarm system 4, and the interlocking protection system comprises an automatic closing device 5, an emergency cut-off system 6, a ventilation system 7 and a fire extinguishing system 9. The in-vehicle sound and light alarm 3, remote DCS alarm system 4, automatic closing device 5, emergency cut-off system 6, ventilation system 7 and fire extinguishing system 9 are respectively connected to the PLC monitoring and recording system 8 for communication, and are controlled to start or stop working by the PLC monitoring and recording system 8. The combustible gas detector 2 uploads the hydrogen concentration value measured in real time by the combustible gas detection sensor 1 to the PLC monitoring and recording system 8 located in the positive pressure control chamber of the detection equipment. When the real-time measured hydrogen concentration value is greater than or equal to the alarm threshold set in the combustible gas detector 2, the detection result is determined to be that the hydrogen concentration exceeds the standard, and the PLC monitoring and recording system 8 triggers an alarm signal. The automatic closing device 5 located at the hydrogen sample sampling inlet end of the detection equipment is started to cut off the hydrogen input source. The emergency cut-off system 6 located in the positive pressure control chamber of the detection equipment is synchronously triggered by the PLC monitoring and recording system 8 to cut off the power supply of the hydrogen detection circuit of the detection equipment, and only retain the emergency power supply function of the control circuit of the detection equipment. The PLC monitoring and recording system 8 also simultaneously triggers the ventilation system 7 located inside the detection vehicle to start emergency ventilation and purge and replace the combustible gas in the vehicle until the measured hydrogen concentration value is less than the alarm threshold. If the ventilation system 7 fails to control the hydrogen concentration in the vehicle to below the alarm threshold within 5 minutes after it is activated, the fire extinguishing system 9 installed on the top of the inspection vehicle is triggered via the PLC monitoring and recording system 8 to start the fire extinguishing work.

[0017] The working principle and process of the present invention are as follows: The combustible gas detection sensor 1 in the system of the present invention is used to detect the hydrogen concentration in the positive pressure control chamber of the detection equipment installed on the hydrogen detection vehicle in real time, and transmit the detection data to the combustible gas detector 2. The combustible gas detector 2 analyzes the detected hydrogen concentration data to detect whether there is hydrogen leakage during the hydrogen quality test process.

[0018] When a leak is detected, the detection data is transmitted to the PLC monitoring and recording system 8 for information storage, and an alarm signal is sent to the in-vehicle sound and light alarm 3 and the remote DCS alarm system 4 in real time. The in-vehicle sound and light alarm 3 sends an audible and visual alarm, and the remote DCS alarm system 4 simultaneously sends the alarm signal to the remote monitoring center, which records the relevant information of the alarm signal for later remote reference. At the same time, the PLC monitoring and recording system 8 controls the automatic closing device 5 to cut off the hydrogen sampling gas source of the detection equipment.

[0019] When the test result shows that the hydrogen concentration exceeds the standard, the PLC monitoring and recording system 8 immediately triggers the alarm system and the interlocking protection system. The activation of the in-vehicle sound and light alarm 3 in the alarm system is used to remind the operator on the detection vehicle, and the remote DCS alarm system 4 is used to send the alarm signal to the remote monitoring center. After the interlocking protection system is activated, the automatic closing device 5 closes the valve of the hydrogen sampling gas source of the detection equipment, and the emergency cut-off system 6 cuts off the power supply of the hydrogen detection line of the detection equipment, and the hydrogen quality detection equipment is powered off. The ventilation system 7 is synchronously controlled by the PLC monitoring and recording system 8 to start the work, replace the air in the car, so as to effectively reduce the hydrogen concentration in the car. If the ventilation system 7 fails to control the hydrogen concentration in the car below the alarm threshold within 5 minutes, the PLC monitoring and recording system 8 triggers the fire extinguishing system 9 to start the fire extinguishing work.

[0020] The present invention requires regular inspection and maintenance, and regular inspection and calibration of the combustible gas detection sensor and the combustible gas detector to ensure their sensitivity and accuracy.

[0021] The present invention is used to deal with the leakage of flammable and explosive gases. In order to further ensure the safety of the detection work, a detailed emergency plan should be formulated and regular drills should be conducted to ensure that personnel can respond quickly in emergency situations.

Claims

1. An alarm and interlocking protection system for a hydrogen detection vehicle, characterized in that: The alarm and interlocking protection system includes a combustible gas detection sensor, a combustible gas detector and a PLC monitoring and recording system connected in sequence, and an alarm system and an interlocking protection system respectively connected to the PLC monitoring and recording system in communication. The combustible gas detection sensor is arranged in the positive pressure control cavity of the hydrogen detection vehicle detection equipment, and is connected to the combustible gas detector through a data transmission line. The combustible gas detector is connected to the PLC monitoring and recording system arranged in the positive pressure control cavity of the detection equipment through a communication cable. The interlocking protection system includes an automatic closing device, an emergency shut-off system and a ventilation system respectively connected to the PLC monitoring and recording system in communication. The automatic closing device, the emergency shut-off system and the ventilation system are respectively controlled to start or stop working by the PLC monitoring and recording system. The automatic closing device is arranged at the hydrogen sample inlet end of the detection equipment. The emergency shut-off system is used to control the power consumption of the detection equipment and is arranged in the positive pressure control cavity of the detection equipment.

2. According to claim 1, the alarm and interlocking protection system for a hydrogen detection vehicle is characterized in that: The combustible gas detector uploads the hydrogen concentration value measured in real time by the combustible gas detection sensor to the PLC monitoring and recording system. When the real-time measured hydrogen concentration value is greater than or equal to the alarm threshold set in the combustible gas detector, the detection result is judged to be that the hydrogen concentration exceeds the standard.

3. The alarm and interlocking protection system for a hydrogen detection vehicle according to claim 1 is characterized in that: The interlocking protection system also includes a fire extinguishing system arranged on the top of the vehicle, which is connected to the PLC monitoring and recording system through a communication cable and is controlled to start or stop working by the PLC monitoring and recording system.

4. The alarm and interlocking protection system for a hydrogen detection vehicle according to claim 1 is characterized in that: The alarm system includes an in-vehicle sound and light alarm and a remote DCS alarm system, and is respectively connected to the PLC monitoring and recording system for communication. The PLC monitoring and recording system controls the activation when hydrogen leaks or the hydrogen concentration exceeds the standard.

5. The alarm and interlocking protection system for a hydrogen detection vehicle according to claim 4 is characterized in that: The activation of the in-vehicle sound and light alarm is used to remind the operator on the detection vehicle, and the remote DCS alarm system is used to send an alarm signal to a remote monitoring center.

6. An alarm and interlocking protection system for a hydrogen detection vehicle according to any one of claims 1 to 4, characterized in that: The PLC monitoring and recording system is provided with a real-time monitoring system and a data recording system, and the monitoring system records all data information of the entire alarm and interlocking protection system working process.

7. An alarm and interlocking protection system for a hydrogen detection vehicle according to claim 1 or 3, characterized in that: The automatic closing device in the interlocking protection system is used to close the valve of the hydrogen sampling gas source of the detection equipment when the hydrogen concentration exceeds the standard. The emergency shut-off system is used to cut off the power supply to the hydrogen detection circuit of the detection equipment when the hydrogen concentration exceeds the standard. The ventilation system is used to replace the air in the vehicle. When the ventilation system fails to control the hydrogen concentration in the vehicle below the alarm threshold within 5 minutes, the PLC monitoring and recording system triggers the fire extinguishing system to start the fire extinguishing work.

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