Hydrogen leakage testing device for marine fuel cell system

Abstract

The utility model provides a marine fuel cell system hydrogen leakage testing device, which comprises a base, a hydrogen leakage collecting cover and a hydrogen concentration sensor, and is characterized in that the base is used for placing a tested marine fuel cell system on the base; the hydrogen leakage collecting cover is arranged above the base and used for collecting leaked hydrogen, the hydrogen concentration sensor is used for detecting the hydrogen concentration, the hydrogen leakage collecting cover comprises a lower peripheral wall, an upper top wall, a circulating pipe and a sensor mounting seat, the upper top wall extends upwards from the lower peripheral wall to the circulating pipe in an inclined mode towards the center, and the sensor mounting seat is arranged on the lower peripheral wall. The circulating pipe is provided with a circulating channel, the sensor mounting seat is arranged in the circulating channel of the circulating pipe, and the hydrogen concentration sensor is fixedly mounted on the sensor mounting seat.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen leakage testing of a marine fuel cell system, in particular to a hydrogen leakage testing device for a marine fuel cell system. Background Art

[0002] A fuel cell is a power generation device that converts the chemical energy in fuel (such as hydrogen) and oxidant (such as oxygen) into electrical energy through an electrochemical reaction. Since it is not limited by the Carnot cycle, it has been gradually and widely used in automotive, stationary power generation, aviation, rail transit, marine and other fields. It has the advantages of zero emissions, high efficiency, high energy density, and strong environmental adaptability.

[0003] Since the use scenarios of ships are different from those of vehicles or fixed power generation, escape and rescue are difficult after a safety accident occurs, and the safety requirements are high. Hydrogen is a flammable gas that is extremely easy to leak and spread. For ship use scenarios, hydrogen leakage testing must be added in the formulation of corresponding standards.

[0004] However, at present, there is a complete lack of standardized hydrogen leakage test equipment and hydrogen leakage test methods for marine fuel cell systems. When formulating corresponding standards, the standardized technical solutions that can be referred to only include the hydrogen leakage test in "GB / T33978-2017 Proton Exchange Membrane Fuel Cell Module for Road Vehicles" and the fuel cell engine air tightness test in "GB / T 24554-2022 Fuel Cell Engine Performance Test Method". In GB / T 24554-2022, its usage scenario is the automotive scenario. The usage environment of automotive and marine applications is different. The fuel cell system on the vehicle is generally installed on the vehicle beam (such as a truck) or has a dedicated engine compartment (such as a car or bus). The installation environment itself is in an open ventilation state, and hydrogen leakage will spread immediately. The power system of the ship is generally installed in the cabin. The cabin is a relatively closed environment compared to the engine compartment of the vehicle. Even if there is a ventilation system, the diffusion of hydrogen leakage is not as fast as that of the vehicle, and hydrogen is prone to accumulation in the cabin. The airtightness test standard for vehicles is not suitable for marine use; moreover, the test gas used is a helium-nitrogen mixed gas, which is inconsistent with the actual working gas, and the fuel cell system is in a non-working state during the test, and cannot directly feedback the system safety. It is essentially an airtightness test, not a hydrogen leakage test. In the hydrogen leakage test of the hydrogen leakage test of GB / T33978-2017, for the encapsulated module, a hydrogen concentration leak detector is used to detect the hydrogen concentration in the module outlet pipe, and the hydrogen concentration is tested at 20 mm above all the screws on the upper surface of the module and 20 mm above the four corners. For the module without encapsulation, a hydrogen concentration leak detector is used to detect the hydrogen concentration at 20 mm around the module. The purpose is to set up multiple detection points to fully reflect the leakage situation, but it is actually impossible to completely cover all areas where leakage may occur. Moreover, since the size and structure of the products (fuel cell modules) of each manufacturer are different, the diffusion state of hydrogen after leakage varies greatly, which leads to large differences in the final detection results.

[0005] Therefore, it is necessary to design a reliable and standardized hydrogen leakage test device and hydrogen leakage test method for marine fuel cell systems according to the design characteristics of the ship and the use characteristics of the fuel cell, so as to ensure the safety of the fuel cell system when used on ships. Utility Model Content

[0006] The main advantage of the utility model is to provide a hydrogen leakage test device for a marine fuel cell system, which is suitable for standardization, and based on the hydrogen leakage test device for a marine fuel cell system, a hydrogen leakage test method for a marine fuel cell system suitable for standardization can be performed.

[0007] Another advantage of the utility model is that it provides a hydrogen leakage test device for a marine fuel cell system, which has strong reliability and versatility, and can ensure that marine fuel cell systems of various manufacturers can obtain relatively fair and accurate test results when hydrogen leakage tests are performed through the marine fuel cell system hydrogen leakage test device.

[0008] Another advantage of the utility model is that it provides a hydrogen leakage test device for a marine fuel cell system, which has a simple structure, low manufacturing difficulty, is easy to use, and has strong reliability and versatility, so that the hydrogen leakage test device for a marine fuel cell system is suitable for standardization.

[0009] Accordingly, according to an embodiment of the present invention, a hydrogen leakage test device for a marine fuel cell system having at least one of the aforementioned advantages comprises:

[0010] A base, used for placing the marine fuel cell system to be tested on the base;

[0011] A hydrogen leakage collection cover, disposed above the base, for collecting leaked hydrogen; and

[0012] A hydrogen concentration sensor, used to detect hydrogen concentration;

[0013] Wherein, the hydrogen leakage collection cover includes a lower circumferential wall, an upper top wall, a flow pipe and a sensor mounting seat, the upper top wall extends upward and obliquely toward the center from the lower circumferential wall to the flow pipe, the flow pipe has a flow channel, the sensor mounting seat is arranged in the flow channel of the flow pipe, and the hydrogen concentration sensor is fixedly mounted on the sensor mounting seat.

[0014] In some embodiments, the hydrogen concentration sensor is located at a height higher than the highest point of the upper top wall.

[0015] In some embodiments, the hydrogen concentration sensor is located at a height higher than the lowest point of the flow tube.

[0016] In some embodiments, the hydrogen concentration sensor is located at a height higher than a height at a junction of the flow tube and the upper top wall.

[0017] In some embodiments, the hydrogen concentration sensor is disposed at a centerline of the flow tube.

[0018] In some embodiments, the hydrogen leak collection cover completely covers the projection area of ​​the tested marine fuel cell system.

[0019] In some embodiments, the lower edge of the lower circumferential wall of the hydrogen leak collection cover is located at a height lower than the top surface or the highest point of the tested marine fuel cell system, so that at least a portion of the lower circumferential wall can surround the tested marine fuel cell system.

[0020] In some embodiments, the lower edge of the lower peripheral wall of the hydrogen leakage collection cover is located 15 cm lower than the top surface or the highest point of the tested marine fuel cell system.

[0021] In some embodiments, the hydrogen concentration sensor is located at a height 100 mm higher than the highest point of the upper top wall.

[0022] In some embodiments, the flow tube has a diameter of 200 mm.

[0023] The above and other advantages of the present invention will be fully reflected in combination with the following description and the accompanying drawings.

[0024] The above and other advantages and features of the present invention are fully reflected in the following detailed description of the present invention and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of a hydrogen leakage test device for a marine fuel cell system according to an embodiment of the utility model.

[0026] Figure 2 It is a top view of a hydrogen leakage testing device for a marine fuel cell system according to an embodiment of the utility model. DETAILED DESCRIPTION

[0027] The following description is provided to enable those skilled in the art to implement the present invention. Other obvious replacements, modifications and variations may occur to those skilled in the art. Therefore, the scope of protection of the present invention should not be limited to the exemplary embodiments described herein.

[0028] Those skilled in the art should understand that, unless otherwise specified herein, the terms "one" and "an" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple.

[0029] Those skilled in the art should understand that, unless otherwise specified herein, the directions or positions referred to by the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the directions or positions shown in the drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the devices or elements involved must have a specific direction or position. Therefore, the above terms should not be understood as limiting the present invention.

[0030] Refer to the attached drawings of this utility model specification Figure 1 and Figure 2 , a hydrogen leakage test device for a marine fuel cell system according to an embodiment of the utility model is explained. The marine fuel cell system hydrogen leakage test device comprises a base 1, a hydrogen leakage collection cover 2 and a hydrogen concentration sensor 3, wherein the base 1 is used to place the marine fuel cell system to be tested on the base 1; the hydrogen leakage collection cover 2 is arranged above the base 1 to collect leaked hydrogen; the hydrogen concentration sensor 3 is used to detect the hydrogen concentration; wherein the hydrogen leakage collection cover 2 comprises a lower peripheral wall 21, an upper top wall 22, a flow pipe 23 and a sensor mounting seat 24, the upper top wall 22 extends upward and tilted toward the center from the lower peripheral wall 21 to the flow pipe 23, the flow pipe 23 has a flow channel 230, the sensor mounting seat 24 is arranged in the flow channel 230 of the flow pipe 23, and the hydrogen concentration sensor 3 is fixedly mounted on the sensor mounting seat 24.

[0031] It can be understood that, since the upper top wall 22 of the hydrogen leakage collection cover 2 extends upward and obliquely toward the center from the lower peripheral wall 21 to the circulation pipe 23, the upper top wall 22 can form a shape extending upward obliquely from the surrounding to the middle, which is conducive to guiding the leaked hydrogen collected by the hydrogen leakage collection cover 2, relying on the low density and rapid diffusion of hydrogen, the leaked hydrogen is guided and converged to the circulation channel 230 of the circulation pipe 23, so as to detect the hydrogen concentration through the hydrogen concentration sensor 3. At the same time, the upper top wall 22 can prevent the leaked hydrogen from being trapped in certain special areas and causing aggregation, such as corners, so as to make the detection result more accurate.

[0032] When the tested marine fuel cell system is placed as a whole on the base 1, the hydrogen leakage collection cover 2 completely covers the projection area of ​​the tested marine fuel cell system, wherein the projection area refers to the projection area formed by projecting a group of mutually parallel projection lines from directly above the tested marine fuel cell system. Moreover, the position height of the lower edge 211 of the lower peripheral wall 21 of the hydrogen leakage collection cover 2 is lower than the position height of the top surface or the highest point of the tested marine fuel cell system, so that at least a part of the lower peripheral wall 21 can surround the tested marine fuel cell system. Therefore, the hydrogen leakage collection cover 2 can cover the hydrogen leakage point as much as possible, thereby collecting the leaked hydrogen of the tested marine fuel cell system as much as possible. In view of this, the marine fuel cell system hydrogen leakage test device has strong reliability and versatility, and can ensure that the marine fuel cell systems of various manufacturers can obtain relatively fair and accurate test results when the hydrogen leakage test is performed by the marine fuel cell system hydrogen leakage test device.

[0033] It is worth mentioning that when the leaked hydrogen is about to converge into the flow channel 230 of the flow pipe 23 from all directions along the upper top wall 22, that is, at the junction of the flow pipe 23 and the upper top wall 22, the leaked hydrogen from all directions has not been evenly mixed, and the hydrogen concentration at the junction has a large volatility. If the hydrogen concentration sensor 3 is set at the junction of the flow pipe 23 and the upper top wall 22, the detection result is inaccurate. Preferably, the position height of the hydrogen concentration sensor 3 is higher than the position height of the highest point of the upper top wall 22, or the position height of the hydrogen concentration sensor 3 is higher than the position height of the lowest point of the flow pipe 23, or the position height of the hydrogen concentration sensor 3 is higher than the position height of the junction of the flow pipe 23 and the upper top wall 22, so as to improve the accuracy of the detection result.

[0034] In order to further improve the accuracy of the detection result, preferably, the hydrogen concentration sensor 3 is arranged at the center line of the circulation pipe 23. It can be understood that after being guided by the upper top wall 22, the leaked hydrogen has a tendency to converge and mix toward the center, so that the concentration detection at the center line of the circulation pipe 23 is more accurate.

[0035] It can be understood that in some embodiments of the present invention, the position height of the hydrogen concentration sensor is higher than the position height of the highest point of the upper top wall; in some embodiments of the present invention, the position height of the hydrogen concentration sensor is higher than the position height of the lowest point of the flow pipe; in some embodiments of the present invention, the position height of the hydrogen concentration sensor is higher than the position height of the junction of the flow pipe and the upper top wall; in some embodiments of the present invention, the hydrogen concentration sensor is arranged at the center line of the flow pipe; in some embodiments of the present invention, the hydrogen leakage collection cover completely covers the projection area of ​​the tested marine fuel cell system; in one embodiment of the present invention In some embodiments, the position height of the lower edge of the lower circumferential wall of the hydrogen leakage collection cover is lower than the position height of the top surface or the highest point of the tested marine fuel cell system, so that at least a portion of the lower circumferential wall can surround the tested marine fuel cell system; in some embodiments of the utility model, the position height of the lower edge of the lower circumferential wall of the hydrogen leakage collection cover is 15 cm lower than the position height of the top surface or the highest point of the tested marine fuel cell system; in some embodiments of the utility model, the position height of the hydrogen concentration sensor is 100 mm higher than the position height of the highest point of the upper top wall; in some embodiments of the utility model, the diameter of the circulation pipe is 200 mm.

[0036] In summary, the marine fuel cell system hydrogen leakage test device has a simple structure, low manufacturing difficulty, is easy to use, and has strong reliability and versatility, so that the marine fuel cell system hydrogen leakage test device is suitable for standardization, and based on the marine fuel cell system hydrogen leakage test device, a marine fuel cell system hydrogen leakage test method suitable for standardization can be performed.

[0037] Specifically, the hydrogen leakage test method for a marine fuel cell system suitable for standardization based on the marine fuel cell system hydrogen leakage test device does not deviate from the following criteria or steps:

[0038] (1) The tested marine fuel cell system is placed as a whole on a base, wherein the height of the base is preferably in the range of 100-120 mm;

[0039] (2) providing a hydrogen leakage collection cover, which completely covers the projected area of ​​the marine fuel cell system being tested, wherein the size of the hydrogen leakage collection cover exceeds the size of the projected area of ​​the marine fuel cell system being tested;

[0040] (3) The lower edge of the lower peripheral wall of the hydrogen leakage collection cover is lower than the top surface or the highest point of the tested marine fuel cell system, so that at least a portion of the lower peripheral wall of the hydrogen leakage collection cover surrounds the tested marine fuel cell system, wherein, preferably, the lower edge of the lower peripheral wall of the hydrogen leakage collection cover is 15 cm lower than the top surface or the highest point of the tested marine fuel cell system;

[0041] (4) The upper top wall of the hydrogen leakage collection cover extends upward from the lower peripheral wall and tilts toward the center to the flow pipe;

[0042] (5) The flow tube is a hollow tubular structure, forming a flow channel, and the diameter of the flow tube is preferably 200 mm;

[0043] (6) A sensor mounting seat is provided in the flow channel of the flow pipe for fixing and mounting the hydrogen concentration sensor;

[0044] (7) The hydrogen concentration sensor is arranged at the center line of the flow pipe and is a set distance higher than the highest point of the upper top wall of the hydrogen leakage collection cover, preferably 100 mm;

[0045] (8) During the startup or operation of the tested marine fuel cell system, the hydrogen concentration sensor should always be in working condition, and the concentration detection range of the hydrogen concentration sensor is preferably 0-40000ppm, and the alarm value of the hydrogen concentration sensor is preferably 10000ppm. When the hydrogen concentration sensor detects that the concentration exceeds 20000ppm, the hydrogen supply of the tested marine fuel cell system should be immediately shut down;

[0046] (9) The entire test process should be carried out in a windless indoor environment to prevent the leaked hydrogen from evaporating.

[0047] Those skilled in the art should understand that the above description and the embodiments shown in the drawings are only for illustrative explanation of the present invention, rather than for limiting the present invention. All equivalent implementations, modifications and improvements within the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydrogen leakage test device for a marine fuel cell system, characterized in that: include: A base, used for placing the marine fuel cell system to be tested on the base; A hydrogen leakage collection cover is arranged above the base and is used to collect leaked hydrogen; and A hydrogen concentration sensor, used to detect hydrogen concentration; Wherein, the hydrogen leakage collection cover includes a lower circumferential wall, an upper top wall, a flow pipe and a sensor mounting seat, the upper top wall extends upward and obliquely toward the center from the lower circumferential wall to the flow pipe, the flow pipe has a flow channel, the sensor mounting seat is arranged in the flow channel of the flow pipe, and the hydrogen concentration sensor is fixedly mounted on the sensor mounting seat.

2. The marine fuel cell system hydrogen leakage test device according to claim 1, characterized in that: The hydrogen concentration sensor is disposed at a center line of the flow pipe.

3. The marine fuel cell system hydrogen leakage test device according to claim 1, characterized in that: The hydrogen leakage collection cover completely covers the projection area of ​​the tested marine fuel cell system.

4. The hydrogen leakage test device for a marine fuel cell system according to claim 1, characterized in that: The lower edge of the lower peripheral wall of the hydrogen leakage collection cover is located at a height lower than the top surface or the highest point of the tested marine fuel cell system, so that at least a portion of the lower peripheral wall can surround the tested marine fuel cell system.

5. The marine fuel cell system hydrogen leakage test device according to claim 1, characterized in that: The position height of the hydrogen concentration sensor is higher than the position height of the highest point of the upper top wall.

6. The marine fuel cell system hydrogen leakage test device according to claim 1, characterized in that: The hydrogen concentration sensor is located at a height higher than the lowest point of the flow pipe.

7. The hydrogen leakage test device for a marine fuel cell system according to claim 1, characterized in that: The position height of the hydrogen concentration sensor is higher than the position height of the junction between the flow tube and the upper top wall.

8. The hydrogen leakage test device for a marine fuel cell system according to claim 4, characterized in that: The position height of the lower edge of the lower peripheral wall of the hydrogen leakage collection cover is 15 cm lower than the position height of the top surface or the highest point of the tested marine fuel cell system.

9. The hydrogen leakage test device for a marine fuel cell system according to claim 5, characterized in that: The position height of the hydrogen concentration sensor is 100 mm higher than the position height of the highest point of the upper top wall.

10. The hydrogen leakage test device for a marine fuel cell system according to any one of claims 1 to 9, characterized in that: The diameter of the flow tube is 200 mm.

Images