Leakage monitoring system for hydrogen production electrolyzer based on optical fiber probe

Abstract

The utility model provides a drip monitoring system for a hydrogen production electrolyzer based on an optical fiber probe, the drip monitoring system includes a drip liquid collection device and a monitoring device, the drip liquid collection device includes a drip receiver and a drip storage device placed below the hydrogen production electrolyzer, the drip receiver is funnel-shaped, and its open surface completely covers the hydrogen production electrolyzer, and is used to receive the dripping liquid of the hydrogen production electrolyzer; the liquid inlet of the drip storage is connected to the liquid outlet of the drip receiver; the monitoring device includes an optical fiber demodulation system and multiple optical fiber probes installed in the drip storage, the pigtail end of each optical fiber probe extends out of the drip storage, and is connected to the optical fiber demodulation system signal through an optical fiber cable. The utility model realizes the collection and alarm functions of dripping of the hydrogen production electrolyzer, with high measurement accuracy and strong environmental adaptability.

Description

Technical Field

[0001] The utility model relates to the field of environmental parameter monitoring, in particular to a hydrogen production electrolyzer leakage monitoring system based on an optical fiber probe. Background Art

[0002] The fiber optic probe is a sensor used to measure the flow state of gas-liquid two-phase. The sensor can be divided into a conduction area and a detection area. When in use, the sensor is connected to any channel of a dedicated probe demodulator. The light generated by the light source is transmitted to the probe head through the optical fiber. The light source is absorbed into the air or liquid through the probe head. The light is reflected and transmitted back to the fiber optic probe. The intensity of the returning optical fiber can be used to determine whether the probe head is in the liquid or in the air. The basic optical fiber of the sensor is a glass solid fiber drawn from silica as the basic material. It has the advantages of anti-electrical interference, high sensitivity, high precision, small size, light weight and easy reuse, which makes the fiber optic probe sensor applicable to various fields.

[0003] The process of hydrogen production by electrolysis of water is simple, the gas purity is high, and it is easy to separate from impurities. It is a completely clean way to produce hydrogen. It is regarded as the best way to the hydrogen economy and has a good application prospect. Therefore, it is very necessary and meaningful to carry out corresponding monitoring design and development in the process of hydrogen production by electrolyzer. The monitoring system for hydrogen production by electrolysis of water adopts PLC control, which has the advantages of high precision and strong anti-interference ability. However, from the perspective of cost structure, the electrolyzer accounts for about 50% of the total cost of the hydrogen production system, and the greater the hydrogen production of the equipment per unit time, the higher the proportion of the electrolyzer in the manufacturing cost of the entire equipment. Therefore, the cost of the electrolyzer is the core of the production cost of the hydrogen production system by electrolysis of water. Nowadays, the cost of the monitoring system for hydrogen production by electrolysis of water is high, which greatly increases the cost of the original electrolyzer and cannot be used on a large scale commercially. Then the use of fiber optic sensing technology for corresponding detection can supplement the current market shortcomings.

[0004] Therefore, combined with the low cost advantage of fiber optic probes, using fiber optic probes for leak monitoring in hydrogen electrolyzers can greatly reduce the cost of hydrogen production by electrolysis of water. Summary of the invention

[0005] In response to the current application demand for high cost monitoring of hydrogen production by electrolysis of water, the utility model proposes a hydrogen production electrolyzer leakage monitoring system based on optical fiber probes. The monitoring system uses low-cost optical fiber probes to monitor the dripping of hydrogen production electrolyzers, which can reduce the monitoring cost. In addition, by setting a dripping liquid collection device, it can avoid dripping directly on the end face of the optical fiber probe to cause erroneous signal output, thereby increasing the accuracy of monitoring.

[0006] In order to achieve the above technical objectives, the utility model provides a drip monitoring system for a hydrogen production electrolyzer based on an optical fiber probe, wherein the drip monitoring system comprises a drip liquid collecting device and a monitoring device, wherein the drip liquid collecting device comprises a drip receiver and a drip storage device placed under the hydrogen production electrolyzer, wherein the drip receiver is funnel-shaped, and its open surface completely covers the hydrogen production electrolyzer, and is used to receive the dripping liquid of the hydrogen production electrolyzer; the liquid inlet of the drip storage device is connected to the liquid outlet of the drip receiver; the monitoring device comprises an optical fiber demodulation system and a plurality of optical fiber probes installed in the drip storage device, wherein the pigtail end of each optical fiber probe extends out of the drip storage device, and is connected to the optical fiber demodulation system signal through an optical fiber cable.

[0007] The better technical solution of the utility model is as follows: the optical fiber probe comprises a measuring optical fiber, a metal protective cover and an output interface; the metal protective cover comprises an inner protective cover, a middle protective cover and an outer protective cover which are sequentially sleeved on the measuring optical fiber from the inside to the outside; the measuring optical fiber and the inner protective cover, as well as the inner protective cover and the middle protective cover are fixed with glue; the outer protective cover and the middle protective cover are independent of each other; the tail fiber of the measuring optical fiber extends out of the metal protective cover and is connected to the output interface, and is connected to the optical fiber demodulation system signal through the output interface.

[0008] The preferred technical solution of the utility model is as follows: a dustproof net is arranged at the liquid outlet of the drip receiver; and a drainage outlet with a sealing cover is arranged at the bottom of the drip receiver.

[0009] A better technical solution of the utility model is as follows: a drainage tube is provided below the drip receiver, the drainage tube is vertically inserted into the drip storage device and is higher than the uppermost optical fiber probe.

[0010] The better technical solution of the utility model: the fiber optic demodulation system is a multi-channel demodulation system, each fiber optic probe is connected to one of the channel signals, and the fiber optic demodulation system enables multiple fiber optic probes to output a low potential of 0 in gas and a high potential of 1 in liquid; the fiber optic demodulation system is provided with an alarm system, and when the fiber optic probe detects electrolyte leakage, the signal is transmitted back to the fiber optic demodulation system for signal demodulation and finally output signal and alarm.

[0011] A better technical solution of the utility model is that the drip receiver is funnel-shaped and the size of the funnel matches the size of the hydrogen production electrolyzer.

[0012] A better technical solution of the utility model: the monitoring device also includes an optical fiber probe for eliminating the influence of light source jitter, the optical fiber probe is not installed in the drip receiver, and is connected to the optical fiber demodulation system.

[0013] A better technical solution of the utility model: the drip storage container is cylindrical.

[0014] A better technical solution of the utility model: a plurality of optical fiber probes are equidistantly distributed on the drip reservoir from top to bottom, and a probe mounting hole is correspondingly opened on the side of the drip reservoir. The measuring optical fiber of the optical fiber probe extends into the drip reservoir, and the outermost protective cover of the optical fiber probe is fixed to the drip reservoir by a sealing component. The pigtail of the optical fiber probe extends out of the probe mounting hole and is connected to the output interface.

[0015] The rate V of electrolyte dripping in the utility model is 泄露率 It can be obtained by the following formula:

[0016]

[0017] Wherein, h is the vertical distance between two adjacent optical fiber probes, r is the inner diameter of the cylindrical drop reservoir, and t is the time difference between the two adjacent optical fiber probes outputting high potential respectively.

[0018] The number of fiber optic probes of the utility model can be fixed inside the drip storage according to the needs, and the distance distribution between the probes can also be adjusted according to the actual needs. The fiber optic demodulation system converts the optical signal returned by the probe into an electrical signal, compares the electrical signal with a certain threshold and finally outputs a low potential of 0 or a high potential of 1. However, the light source may have unstable intensity or wavelength drift, resulting in wrong judgment and output of wrong signal. Therefore, an additional fiber optic probe is connected to the fiber optic demodulation system based on the required number of optical fibers, and it is used as a reference probe to eliminate the influence of light source jitter.

[0019] Technical effects of the utility model:

[0020] (1) The monitoring system of the utility model uses optical fiber probes for leak monitoring of hydrogen production electrolyzers. The optical fiber probes are simple to manufacture, have good consistency, and are relatively accurate in distinguishing between gas-liquid two-phase media, thereby solving the problem of high cost of monitoring hydrogen production electrolyzers and providing relatively accurate monitoring results. When a leak occurs in the hydrogen production electrolyzer, the monitoring system can receive the leaked electrolyte and issue an alarm when the leakage reaches a certain level, thereby reducing the risk level and keeping costs low.

[0021] (2) The utility model is provided with a dripping liquid collecting device, which includes a funnel-shaped dripping receiver and a dripping storage device, and an optical fiber probe is installed in the dripping storage device. The drainage tube below the funnel-shaped dripping collector is tightly attached to and fixed to the inner wall of the other side of the dripping storage device where the probe is located, so as to prevent the liquid from touching the optical fiber probe when the dripping liquid directly flows into the dripping storage device, causing the output of an erroneous signal and an erroneous alarm, thereby increasing the monitoring accuracy. In addition, a drainage outlet is provided at the bottom of the dripping storage device for draining and cleaning the dripping storage device.

[0022] (3) The outermost protective cover of the optical fiber probe in the present invention is independent of the rest of the probe. When installing the probe, the outermost protective cover is fixed to the wall of the drip reservoir and can protect the measuring optical fiber at the head of the optical fiber probe from being damaged during the installation process. When the installation is completed, the probe can be pulled out to expose the measuring optical fiber. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the application structure diagram of the utility model;

[0024] Figure 2 This is a diagram showing the internal structure of the drip storage device of the utility model;

[0025] Figure 3 This is a schematic diagram of the structure of the optical fiber probe of the utility model;

[0026] Figure 4 It is the work flow chart of the utility model;

[0027] In the figure: 1 - hydrogen production electrolyzer, 2 - drip receiver, 200 - drainage tube, 3 - drip storage, 301 - sealing assembly, 4 - optical fiber probe, 401 - measuring optical fiber, 402 - inner metal protective sleeve, 403 - middle metal protective sleeve, 404 - outer metal protective sleeve, 5 - optical fiber demodulation system, 6 - dustproof net, 7 - drainage outlet. DETAILED DESCRIPTION

[0028] The utility model is further described below in conjunction with the accompanying drawings and embodiments. Figures 1 to 4 The drawings are all examples of embodiments, which are drawn in a simplified manner and are only used to clearly and briefly illustrate the embodiments of the utility model. The technical solutions shown in the following drawings are specific solutions of the embodiments of the utility model and are not intended to limit the scope of the utility model to be protected. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] In the description of the present invention, it should be understood that the terms "upper", "lower", "inside", "outside", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the product of the invention is usually placed when in use, or are directions or positional relationships commonly understood by those skilled in the art. These directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0030] The embodiment provides a hydrogen production electrolyzer leakage monitoring system based on an optical fiber probe, such as Figure 1 and Figure 2 As shown, the drip monitoring system includes a drip liquid collecting device and a monitoring device, the drip liquid collecting device includes a drip receiver 2 and a drip storage 3 placed below the hydrogen production electrolyzer 1, the drip receiver 2 is funnel-shaped, used to receive the dripping liquid of the hydrogen production electrolyzer 1, the size of the funnel matches the size of the hydrogen production electrolyzer 1, and its open surface completely covers the hydrogen production electrolyzer 1 to completely receive the electrolyte leaked from the electrolyzer 1; the drip storage 3 is cylindrical, but not limited to a cylindrical shape, and its liquid inlet is connected to the liquid outlet of the drip receiver 2, and a drainage tube is provided below the drip receiver 2, the drainage tube extends vertically into the drip storage 3, and is higher than the uppermost optical fiber probe 4, so as to minimize the risk of the leaked electrolyte accidentally contacting the optical fiber probe 4 when entering the drip storage to cause a false alarm. A row of drainage ports 7 with sealing covers are provided at the bottom of the drip receiver 2 ; a dustproof net 6 is placed at the entrance of the drainage pipe 200 of the drip receiver 2 to prevent dust and other impurities from entering the drip storage 3 below the drip receiver 2 .

[0031] The embodiment provides a hydrogen production electrolyzer leakage monitoring system based on an optical fiber probe, such as Figure 1 and Figure 2 As shown, the monitoring device includes an optical fiber demodulation system 5 and three optical fiber probes 4 installed in the drip reservoir 3. The three optical fiber probes 4 are fixedly installed on the right side of the drip reservoir 3 at equal distances from top to bottom. Two adjacent probes are evenly distributed with a distance of 30 mm. Each optical fiber probe 4 is fixed to the drip reservoir and the probe head is placed inside the drip reservoir. Its pigtail end extends out of the drip reservoir 3 and is connected to the optical fiber demodulation system 5 by optical fiber cable. A probe installation hole is correspondingly opened on the side of the drip reservoir 3. The measuring optical fiber 401 of the optical fiber probe 4 extends into the drip reservoir 3. The outermost protective cover 404 of the optical fiber probe 4 is fixed to the drip reservoir 3 with a sealing component 301, and the pigtail of the optical fiber probe 4 extends out of the probe installation hole. The monitoring device also includes an optical fiber probe for eliminating the influence of light source jitter. The optical fiber probe is not installed in the drip receiver 2 and is connected to the optical fiber demodulation system 5. The optical fiber demodulation system 5 is a multi-channel demodulation system, each optical fiber probe 4 is connected to one of the channel signals, and the optical fiber demodulation system 5 enables multiple optical fiber probes 4 to output a low potential of 0 in gas and a high potential of 1 in liquid; Figure 4 As shown, the optical fiber demodulation system 5 is provided with an alarm system, and when the optical fiber probe 4 detects electrolyte leakage, the signal is transmitted back to the optical fiber demodulation system 5 for signal demodulation and finally outputs a signal and issues an alarm.

[0032] The embodiment provides a hydrogen production electrolyzer leakage monitoring system based on an optical fiber probe, such as Figure 3As shown, the optical fiber probe 4 includes a measuring optical fiber 401, a metal protective sleeve and an output interface 405. The metal protective sleeve includes an inner protective sleeve 402, an intermediate protective sleeve 403 and an outer protective sleeve 404 which are sequentially sleeved on the measuring optical fiber 401 from the inside to the outside. The measuring optical fiber 401 and the inner protective sleeve 402, and the inner protective sleeve 402 and the intermediate protective sleeve 403 are fixed with glue. The outer protective sleeve 404 is independent of the above-mentioned probe part and can protect the head of the optical fiber probe 4 when the probe is installed. After the installation is completed, the optical fiber probe can be pulled to expose the probe head. The pigtail of the measuring optical fiber 401 extends out of the metal protective sleeve and is connected to the output interface 405, and is connected to the optical fiber demodulation system 5 signal through the output interface. The output interface is connected to the optical fiber demodulation system to output the demodulated signal. In order to prevent the influence of the light source jitter on the output signal, an additional optical fiber probe is connected to the demodulator as a reference probe. If the output demodulation signal is 0000, it means that the electrolyte has not leaked or the leakage has not reached the lower probe; if the output demodulation signal is 0100, it means that the leakage has reached the lower probe and has not reached the middle probe; if the output demodulation signal is 0110, it means that the leakage has reached the middle probe and has not reached the upper probe; if the output demodulation signal is 0111, it means that the leakage has reached the upper probe, and the monitoring system will alarm. If the optical fiber demodulation system outputs an error signal, it means that there is a problem with the monitoring system, and its various parts need to be checked to determine the cause of the error and repair it.

[0033] In the embodiment, the electrolyte leaked from the hydrogen production electrolyzer 1 drips into the funnel-shaped drip receiver 2 and enters the drip storage 3 after being filtered by the dustproof net 6. The head of the optical fiber probe 4 placed inside the drip storage transmits the optical signal to the optical fiber demodulation system 5 for signal demodulation and outputs the demodulated signal. As the electrolyte capacity gradually increases, the three optical fiber probes 5 will successively output high potentials. When the top optical fiber probe outputs a high potential, the monitoring system will alarm, indicating that the drip storage 3 is full, and the electrolyte can be discharged and the drip storage 3 can be cleaned by using the drain port 7. The time difference t between the output of high potential between two adjacent probes is 8000ms, the bottom inner diameter r of the cylindrical drip storage is 50mm, and the distance between two adjacent probes is 30mm. The calculated leakage rate of the hydrogen production electrolyzer is 29.44 mm 3 / ms.

[0034] The above is only an embodiment of the utility model, and its description is relatively specific and detailed, but it cannot be understood as a limitation of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the attached claims.

Claims

1. A hydrogen production electrolyzer leakage monitoring system based on optical fiber probe, characterized in that: The drip monitoring system comprises a drip liquid collection device and a monitoring device, wherein the drip liquid collection device comprises a drip receiver (2) and a drip storage (3) placed below the hydrogen production electrolyzer (1), wherein the drip receiver (2) is funnel-shaped, and its open surface completely covers the hydrogen production electrolyzer (1) and is used to receive the drip liquid of the hydrogen production electrolyzer (1); the liquid inlet of the drip storage (3) is connected to the liquid outlet of the drip receiver (2); and the monitoring device comprises an optical fiber demodulation system (5) and a plurality of optical fiber probes (4) installed in the drip storage (3), wherein the pigtail end of each optical fiber probe (4) extends out of the drip storage (3) and is connected to the optical fiber demodulation system (5) signal through an optical fiber cable.

2. The hydrogen production electrolyzer leakage monitoring system based on optical fiber probe according to claim 1 is characterized in that: The optical fiber probe (4) comprises a measuring optical fiber (401), a metal protective cover and an output interface (405); the metal protective cover comprises an inner protective cover (402), an intermediate protective cover (403) and an outer protective cover (404) which are sequentially sleeved on the measuring optical fiber (401) from the inside to the outside; the measuring optical fiber (401) and the inner protective cover (402), and the inner protective cover (402) and the intermediate protective cover (403) are fixed by glue; the outer protective cover (404) and the intermediate protective cover (403) are independent of each other; the pigtail of the measuring optical fiber (401) extends out of the metal protective cover and is connected to the output interface (405), and is signal-connected to an optical fiber demodulation system (5) via the output interface.

3. A hydrogen production electrolyzer leakage monitoring system based on an optical fiber probe according to claim 1 or 2, characterized in that: A dustproof net (6) is provided at the liquid outlet of the drip receiver (2); and a drainage outlet (7) with a sealing cover is provided at the bottom of the drip receiver (2).

4. A hydrogen production electrolyzer leakage monitoring system based on an optical fiber probe according to claim 1 or 2, characterized in that: A drainage tube (200) is provided below the drip receiver (2), and the drainage tube (200) is vertically inserted into the drip storage (3) and is higher than the uppermost optical fiber probe (4).

5. A hydrogen production electrolyzer leakage monitoring system based on an optical fiber probe according to claim 1 or 2, characterized in that: The optical fiber demodulation system (5) is a multi-channel demodulation system. Each optical fiber probe (4) is connected to one of the channel signals. The optical fiber demodulation system (5) enables the multiple optical fiber probes (4) to output a low potential, i.e., 0, in gas and a high potential, i.e., 1 in liquid. The optical fiber demodulation system (5) is provided with an alarm system. When the optical fiber probe (4) detects electrolyte leakage, the signal is transmitted back to the optical fiber demodulation system (5) for signal demodulation and finally outputs a signal and generates an alarm.

6. A hydrogen production electrolyzer leakage monitoring system based on optical fiber probe according to claim 1 or 2, characterized in that: The drip receiver (2) is funnel-shaped, and the size of the funnel matches the size of the hydrogen production electrolyzer (1).

7. A hydrogen production electrolyzer leakage monitoring system based on optical fiber probe according to claim 1 or 2, characterized in that: The monitoring device also includes an optical fiber probe for eliminating the influence of light source jitter; the optical fiber probe is not installed in the drip receiver (2) and is connected to the optical fiber demodulation system (5).

8. A hydrogen production electrolyzer leakage monitoring system based on an optical fiber probe according to claim 1 or 2, characterized in that: The drip storage container (3) is cylindrical.

9. The hydrogen production electrolyzer leakage monitoring system based on optical fiber probe according to claim 2, characterized in that: A plurality of optical fiber probes (4) are equidistantly distributed on a drip reservoir (3) from top to bottom, and a probe mounting hole is correspondingly opened on the side of the drip reservoir (3). A measuring optical fiber (401) of the optical fiber probe (4) extends into the drip reservoir (3), an outermost protective cover (404) of the optical fiber probe (4) is fixed to the drip reservoir (3) by a sealing component (301), and a pigtail of the optical fiber probe (4) extends out of the probe mounting hole and is connected to an output interface (405).

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