Cold hydrogen explosion parameter testing system and method

Abstract

The invention provides a cold hydrogen explosion parameter testing system and method. The testing system comprises a vacuum heat insulation container, an explosion container, a first gas supply device and a second gas supply device. The vacuum heat-insulating container is used for providing a heat-insulating environment; the explosion container is arranged in the heat insulation environment and is used for carrying out a cold hydrogen explosion parameter test to be tested; the first gas supply device is connected with the explosion container and is used for supplying low-temperature hydrogen-oxygen mixed gas into the explosion container, so that the concentration of hydrogen in the explosion container reaches a preset value; the second gas supply device is connected with the explosion container and is used for supplying supercooled hydrogen into the explosion container, and the supercooled hydrogen is diffused in the low-temperature hydrogen-oxygen mixed gas to form the cold hydrogen to be detected. According to the invention, the gas is introduced by a two-step method to form the cold hydrogen to be tested, so that the uniformity of the cold hydrogen to be tested is effectively improved, the unsteady state simulation of ultralow-temperature hydrogen and even liquid hydrogen at the initial leakage stage in a low-temperature environment can be realized, and the test data has more realistic guidance.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydrogen energy utilization equipment, and specifically relates to a cold hydrogen explosion parameter testing system and method. Background Art

[0002] The development of the hydrogen energy industry faces two main bottlenecks: hydrogen production cost and hydrogen energy safety. For the general public, the more concerned issue is hydrogen energy safety. As a clean energy carrier, cold hydrogen has broad application prospects in fields such as aerospace and energy.

[0003] Compared with conventional energy sources, hydrogen has many characteristics that are not conducive to safety. For example, hydrogen has a wide combustion range in air (volume fraction 4.1% - 74.1%), an extremely low minimum ignition energy (only 0.02 mJ), and hydrogen also has properties such as hydrogen embrittlement, easy leakage, and easy diffusion. Therefore, there are significant fire and explosion risks in all aspects of hydrogen energy utilization.

[0004] Over the years, hydrogen accidents have occurred frequently at home and abroad, even causing significant casualties and property losses and having an adverse impact on the public psychology, making some people "turn pale at the mention of hydrogen". The safety issue has already become one of the important bottlenecks in the popularization of hydrogen energy and is a major challenge that countries around the world, including China, urgently need to solve.

[0005] The explosion characteristics of cold hydrogen are significantly different from those of traditional fuels, and its explosion parameters (such as explosion limit, minimum ignition energy, explosion pressure, etc.) are greatly affected by factors such as temperature, pressure, and concentration. Therefore, developing a testing system that can accurately measure the explosion parameters of cold hydrogen is of great significance for the safe storage, transportation, and use of cold hydrogen.

[0006] In view of this, the present invention is specifically proposed. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to at least overcome some deficiencies of the prior art and provide a cold hydrogen explosion parameter testing system. The aim is to supply a low-temperature hydrogen-oxygen mixed gas to an explosion container by using a first gas supply device, so that after the hydrogen concentration in the explosion container reaches a preset value, then supply supercooled hydrogen into the explosion container by using a second gas supply device. After the supercooled hydrogen diffuses in the low-temperature hydrogen-oxygen mixed gas, the cold hydrogen to be measured is formed, effectively improving the uniformity of the cold hydrogen to be measured, and enabling the non-steady state simulation of the initial stage of leakage of ultra-low temperature hydrogen or even liquid hydrogen in a low-temperature environment, making the test data more realistically guiding.

[0008] To solve the above technical problem, the basic concept of the technical solution adopted by the present invention is:

[0009] A cold hydrogen explosion parameter testing system, comprising:

[0010] A vacuum-insulated container for providing an adiabatic environment;

[0011] An explosion container disposed in the adiabatic environment for conducting tests on the explosion parameters of cold hydrogen to be measured;

[0012] A first gas supply device connected to the explosion container for supplying a cryogenic hydrogen-oxygen mixed gas into the explosion container to make the hydrogen concentration in the explosion container reach a preset value; and

[0013] A second gas supply device connected to the explosion container for supplying subcooled hydrogen into the explosion container, and the subcooled hydrogen diffuses in the cryogenic hydrogen-oxygen mixed gas to form the cold hydrogen to be measured.

[0014] In some embodiments, the second gas supply device includes:

[0015] A second cold bath chamber for providing a subcooled environment; and

[0016] A second hydrogen supply pipeline, the outlet of the second hydrogen supply pipeline leads into the interior of the explosion container, and the inlet of the second hydrogen supply pipeline is connected to a hydrogen source, wherein a partial section of the second hydrogen supply pipeline is located in the second cold bath chamber to provide subcooling for the hydrogen.

[0017] In some embodiments, the outlet of the second hydrogen supply pipeline is located at the bottom of the explosion container and is provided with an ejector to inject subcooled hydrogen into the explosion container.

[0018] In some embodiments, the cooling medium in the second cold bath chamber is liquid neon.

[0019] In some embodiments, an igniter for igniting the cold hydrogen to be measured and an ultraviolet detector for detecting the spark of the igniter are provided inside the explosion container.

[0020] In some embodiments, the first gas supply device includes:

[0021] A first cold bath chamber for providing a precooling environment; and

[0022] A first hydrogen supply pipeline, the outlet of the first hydrogen supply pipeline leads into the interior of the explosion container, and the inlet of the first hydrogen supply pipeline is connected to a hydrogen-oxygen mixing container, wherein a partial section of the first hydrogen supply pipeline is located in the first cold bath chamber to provide precooling for the hydrogen.

[0023] In some embodiments, the cooling medium in the first cold bath chamber is dry ice-acetone.

[0024] The present invention also provides a method for testing cold hydrogen explosion parameters, applicable to the cold hydrogen explosion parameter testing system as described above, including:

[0025] Perform pre-cooling and vacuum pumping on the explosion container;

[0026] Supply a cryogenic hydrogen-oxygen mixed gas to the explosion container to make the hydrogen concentration in the explosion container reach a preset value; and

[0027] Supply supercooled hydrogen into the explosion container, and make the supercooled hydrogen diffuse in the cryogenic hydrogen-oxygen mixed gas to form the to-be-tested cold hydrogen.

[0028] In some embodiments, the preset value is the highest hydrogen concentration at which the cryogenic hydrogen-oxygen mixed gas does not explode in the explosion container.

[0029] In some embodiments, start continuous pulse ignition while supplying supercooled hydrogen into the explosion container, and use an ultraviolet detector to detect explosion sparks.

[0030] After adopting the above technical solutions, the present invention has the following beneficial effects compared with the prior art.

[0031] 1. The cold hydrogen explosion parameter testing system and method provided by the present invention supply a cryogenic hydrogen-oxygen mixed gas to the explosion container by using the first gas supply device, so that the hydrogen concentration in the explosion container reaches a preset value, and then supply supercooled hydrogen into the explosion container by using the second gas supply device. The supercooled hydrogen diffuses in the cryogenic hydrogen-oxygen mixed gas to form the to-be-tested cold hydrogen, effectively improving the uniformity of the to-be-tested cold hydrogen, and can realize the non-steady state simulation at the initial stage of leakage of ultra-low temperature hydrogen or even liquid hydrogen in a low temperature environment, making the test data more realistically instructive.

[0032] 2. The cold hydrogen explosion parameter testing system and method provided by the present invention start continuous pulse ignition while supplying supercooled hydrogen into the explosion container, and use an ultraviolet detector to detect explosion sparks as the primary judgment condition for whether combustion explosion occurs, so that the initial conditions at the time of the triggered combustion explosion can be obtained more accurately, providing a reliable test basis for the basic research on cold hydrogen safety.

[0033] The following further describes in detail the specific embodiments of the present invention with reference to the accompanying drawings. Description of the Drawings

[0034] The accompanying drawings, as a part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention, but do not constitute an improper limitation to the present invention. Obviously, the accompanying drawings in the following description are only some embodiments, and for those of ordinary skill in the art, other drawings can be obtained according to these drawings without creative efforts. In the drawings:

[0035] Figure 1It is a schematic structural diagram of a cold hydrogen explosion parameter test system provided according to an exemplary embodiment of the present invention.

[0036] In the figure: 100, test system;

[0037] 10, vacuum adiabatic container; 11, outer container; 12, inner container; 13, base;

[0038] 20, explosion container;

[0039] 30, first gas supply device; 31, first cold bath cabin; 32, first hydrogen supply pipeline; 33, hydrogen-oxygen mixing container; 331, mixer; 332, agitator;

[0040] 40, second gas supply device; 41, second cold bath cabin; 42, second hydrogen supply pipeline; 43, hydrogen source;

[0041] 50, ignition wire;

[0042] 60, test device; 61, hydrogen concentration sensor; 62, first temperature sensor; 63, second temperature sensor; 64, pressure sensor; 65, first flowmeter; 66, second flowmeter; 67, ultraviolet detector;

[0043] 70, vacuum pump;

[0044] 80, liquid nitrogen cold source.

[0045] It should be noted that these drawings and text descriptions are not intended to limit the scope of the concept of the present invention in any way, but to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Embodiments

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0047] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0048] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] As described above, developing a test system capable of accurately measuring cold hydrogen explosion parameters is of great significance for the safe storage, transportation, and use of cold hydrogen. However, the density of hydrogen is very different from that of air or oxygen. In a low-temperature environment, the two are not easily mixed evenly, which seriously affects the accuracy of cold hydrogen explosion parameter testing. Therefore, how to effectively control the uniformity of the mixed hydrogen is an urgent problem to be solved. Based on this, the present invention provides a cold hydrogen explosion parameter test system, including a vacuum adiabatic container, an explosion container, a first gas supply device, and a second gas supply device. The vacuum adiabatic container is used to provide an adiabatic environment; the explosion container is arranged in the adiabatic environment and is used to conduct an experiment on the cold hydrogen explosion parameters to be measured; the first gas supply device is connected to the explosion container and is used to supply a low-temperature hydrogen-oxygen mixed gas into the explosion container so that the hydrogen concentration in the explosion container reaches a preset value; the second gas supply device is connected to the explosion container and is used to supply supercooled hydrogen into the explosion container, and the supercooled hydrogen diffuses in the low-temperature hydrogen-oxygen mixed gas to form the cold hydrogen to be measured. In the above solution, by using the first gas supply device to supply a low-temperature hydrogen-oxygen mixed gas into the explosion container so that the hydrogen concentration in the explosion container reaches a preset value, and then using the second gas supply device to supply supercooled hydrogen into the explosion container, the supercooled hydrogen diffuses in the low-temperature hydrogen-oxygen mixed gas to form the cold hydrogen to be measured, effectively improving the uniformity of the cold hydrogen to be measured, and realizing the non-steady-state simulation of the initial stage of leakage of ultra-low temperature hydrogen or even liquid hydrogen in a low-temperature environment, making the test data more realistically guiding.

[0050] Figure 1 The structure of a cold hydrogen explosion parameter test system 100 according to an exemplary embodiment of the present invention is shown.

[0051] As Figure 1 shown, the test system 100 includes a vacuum adiabatic container 10, an explosion container 20, a first gas supply device 30, a second gas supply device 40, an ignition wire 50, and a test device 60.

[0052] The vacuum adiabatic container 10 is used to provide an adiabatic environment for the test of cold hydrogen explosion parameters to be measured. The explosion container 20 is arranged in the adiabatic environment and is used to conduct the test of cold hydrogen explosion parameters to be measured. The first gas supply device 30 is connected to the explosion container 20 and is used to supply a low-temperature hydrogen-oxygen mixed gas into the explosion container 20 so that the hydrogen concentration in the explosion container 20 reaches a preset value. The second gas supply device 40 is connected to the explosion container 20 and is used to supply supercooled hydrogen into the explosion container 20. The supercooled hydrogen diffuses in the low-temperature hydrogen-oxygen mixed gas to form the cold hydrogen to be measured. The test device 60 includes detection elements such as a hydrogen concentration sensor 61, a temperature sensor, a pressure sensor 64, a flowmeter, an ultraviolet detector 67, etc. for detecting the environmental parameters and state parameters of the test system 100, and a data processing unit for analyzing and processing the detected data.

[0053] When testing the cold hydrogen explosion parameters, the explosion container 20 is first pre-cooled and evacuated.

[0054] As an example, the vacuum adiabatic container 10 includes an outer container 11 and an inner container 12 arranged in the outer container 11. A vacuum adiabatic cavity is formed between the outer container 11 and the inner container 12 to keep the inner container 12 in an adiabatic state, reduce the heat exchange between the cold hydrogen to be measured and the external environment, and reduce the heat leakage. Optionally, the vacuum adiabatic container 10 adopts a double-wall structure made of stainless steel plates. The stainless steel plates adopt pearlitic steel to ensure that a vacuum adiabatic environment can be provided. The explosion container 20 is made of a high-strength low-temperature-resistant material and is internally provided with a first temperature sensor 62, a pressure sensor 64, etc. to simulate the cold hydrogen explosion environment under different temperature and pressure conditions. The explosion container 20 is vertically fixed on the base 13 and is arranged in the inner container 12. At a position at a certain distance from the bottom of the explosion container 20 in the explosion container 20, an ignition wire 50 is provided. For example, two copper wires with their tops ground into a flat surface are fixed at a certain interval as the ignition wire 50, and a neon lamp transformer with a secondary voltage of 15 kV is used to generate an alternating current discharge for ignition.

[0055] The inner container 12 and the explosion container 20 are connected to a liquid nitrogen cold source 80 through a first connecting pipeline. The liquid nitrogen in the liquid nitrogen cold source 80 is input into the inner container 12 and the explosion container 20 to pre-cool the inner container 12 and the explosion container 20 to a preset pre-cooling temperature. In addition, the inner container 12 and the explosion container 20 are connected to a vacuum pump 70 through a second connecting pipeline, and then the inner container 12 and the explosion container 20 are evacuated by the vacuum pump 70 to eliminate the influence of air on the test results.

[0056] Optionally, multiple liquid supply pipes with an outer diameter of approximately 10 mm are vertically inserted between the inner container 12 and the explosion container 20, and the liquid supply pipes are connected to the first connecting pipeline, and multiple fine holes with an aperture of approximately 2 mm are opened on the liquid supply pipes. Liquid nitrogen passes through the first connecting pipeline and is sprayed out from the fine holes of the liquid supply pipe to cool the inner container 12 and the explosion container 20. As an example, a first temperature sensor 62 is installed at the bottom and two positions approximately in the middle of the outer wall of the explosion container 20 to compare the temperature of these positions with the temperature of the gas in the explosion container 20 and adjust the spray amount of liquid nitrogen for cooling.

[0057] After the above preparations are completed, the first gas supply device 30 is used to supply low-temperature hydrogen-oxygen mixed gas to the explosion container 20, so that the hydrogen concentration in the explosion container 20 reaches a preset value. The preset value is the maximum hydrogen concentration of the low-temperature hydrogen-oxygen mixed gas in the explosion container 20 without explosion.

[0058] The above-mentioned preset value can be obtained through the following process: when only the first gas supply device 30 is turned on, the first manual controlled ignition attempt is started after the temperature and hydrogen concentration data in the explosion container 20 are stable. In this state, no combustion or explosion should occur, and the purpose is to obtain a steady-state safety parameter value close to the lower explosion limit. If the requirement for this data is very high, the hydrogen concentration in the mixed gas can be gradually increased in small amounts, and the hydrogen concentration can be reduced again until the combustion and explosion occur, and the hydrogen concentration is not reduced until the combustion and explosion do not occur. The hydrogen concentration at this time is the above-mentioned preset value.

[0059] When the hydrogen concentration in the explosion container 20 reaches a preset value and the temperature state in the explosion container 20 lasts for about 3 to 15 minutes, the second gas supply device 40 is used to supply supercooled hydrogen into the explosion container 20, so that the supercooled hydrogen diffuses in the low-temperature hydrogen-oxygen mixed gas to form the cold hydrogen to be tested. It should be pointed out here that the supercooled hydrogen supplied into the explosion container 20 by the second gas supply device 40 is hydrogen with very high purity, which can be understood as pure hydrogen.

[0060] Moreover, while supplying supercooled hydrogen into the explosion container 20, continuous pulse ignition is started, and when the hydrogen concentration in the explosion container 20 increases to the explosion limit value, an explosion occurs in the explosion container 20. It should be noted that while supplying supercooled hydrogen into the explosion container 20, continuous pulse ignition is started, stratification in the hydrogen and oxygen explosion container 20 can be prevented, which affects the uniformity of the mixed gas.

[0061] It can be understood that a gas duct is installed on the upper cover of the vacuum insulation container 10 and the explosion container 20 for installing the hydrogen concentration sensor 61. In addition, a protective cover of the first temperature sensor and a pressure sensor 64 are also installed on the upper cover of the vacuum insulation container 10 and the explosion container 20.

[0062] In this process, ignition is started at the same time as the supercooled hydrogen is injected, and continuous pulse ignition is used. The duration of the spark discharge is 0.1 to 0.2 seconds, and the interval between adjacent pulses is within 0.1 to 1 second. An ultraviolet detector 67 with a response time of less than 50ms is used to detect the spark position as the primary judgment condition for whether combustion and explosion occur. After triggering, the pressure increase is detected after a delay of 1s, and the temperature increase is detected within a delay of 2s as a post-verification condition. Once it is detected that the combustion and explosion have been triggered, the subsequent ignition pulses are terminated to ensure that the combustion and explosion occur only once, avoiding interference caused by multiple combustion and explosions in a short period of time.

[0063] When it is confirmed that the temperature or pressure in the container rises due to the ignition, it can be determined whether the flame has spread. The detection results of the first temperature sensor 62 at different positions can determine the combustion distance.

[0064] After triggering the explosion using the above-mentioned trial method, the actual precise time of triggering the explosion can be determined through data analysis, thereby obtaining more comprehensive cold hydrogen explosion input conditions, including parameters such as minimum limit hydrogen concentration, combustion distance, supercooled hydrogen dosage and injection time.

[0065] In order to obtain the explosion limit value, the hydrogen concentration is changed near the limit and repeated measurements are performed multiple times. When the difference in hydrogen concentration between ignition and non-ignition reaches less than 0.1%, the average value of the two is taken as the explosion limit value.

[0066] It is understandable that the time limit in the above test process is only for explaining the technical solution of the present invention, and does not constitute a limitation on the protection scope of the present invention. In actual application, it can be adaptively adjusted according to the test conditions.

[0067] In the above scheme, a two-step gas injection synthesis is used to form the cold hydrogen to be tested, which can not only improve the uniformity of the mixed gas, but also realize the non-steady-state simulation of the initial leakage of ultra-low temperature hydrogen or even liquid hydrogen in a low-temperature environment, making the test data more realistic and instructive.

[0068] In some embodiments, the first gas supply device 30 includes a first cold bath chamber 31 and a first hydrogen supply pipeline 32, the first cold bath chamber 31 is used to provide a pre-cooling environment, the outlet of the first hydrogen supply pipeline 32 is connected to the inside of the explosion container 20, and the inlet of the first hydrogen supply pipeline 32 is connected to the hydrogen-oxygen mixed container 33, wherein a portion of the first hydrogen supply pipeline 32 is located in the first cold bath chamber 31 to provide pre-cooling for hydrogen. Optionally, the cooling medium in the first cold bath chamber 31 is dry ice-acetone. The first hydrogen supply pipeline 32 is provided with a valve and a first flow meter 65 for detecting the flow rate of the hydrogen-oxygen mixed gas in the first hydrogen supply pipeline 32.

[0069] Specifically, the hydrogen-oxygen mixing container 33 includes a mixer 331 and a stirrer 332. The mixer 331 is made of a stainless-steel pressure-resistant container, and the container volume can be selected according to actual requirements, such as 3L to 5L. The stirrer 332 adopts an electromagnetic stirring vane type stirring structure. The mixer 331 is connected with a pressure gauge for detecting the internal pressure to prevent excessive pressure. The first hydrogen supply pipeline 32 between the mixer 331 and the explosion container 20 is made of copper pipe. Part of the pipe section is wound into a coiled pipe and placed in the dry ice-acetone in the first cold bath chamber 31 to preliminarily precool the hydrogen-oxygen mixed gas, and the temperature is evenly reduced to below -78°C. It should be noted that the hydrogen concentration in the hydrogen-oxygen mixed gas output from the mixer 331 should be as close as possible to the final test parameters, and the negative deviation of the absolute value of the percentage concentration does not exceed 0.5%. The final test parameters are associated with the test conditions and can be determined by changing the proportional partial pressure of the gas source in front of the mixer 331 and in the gas chromatography analysis step. Specifically, the sample hydrogen, oxygen or air is pressed into the mixer 331 at a predetermined proportional partial pressure, and after stirring, the concentration of hydrogen is analyzed by gas chromatography to more accurately measure the concentration of hydrogen in the pre-mixed hydrogen-oxygen mixed gas.

[0070] In some embodiments, the second gas supply device 40 includes a second cold bath chamber 41 and a second hydrogen supply pipeline 42. The second cold bath chamber 41 is used to provide a supercooled environment. The outlet of the second hydrogen supply pipeline 42 leads into the interior of the explosion container 20, and the inlet of the second hydrogen supply pipeline 42 is connected to a hydrogen source 43. Among them, part of the second hydrogen supply pipeline 42 is located in the second cold bath chamber 41 to provide supercooling for hydrogen. The second cold bath chamber 41 adopts a Dewar structure, and the cooling medium in the second cold bath chamber 41 is liquid neon. A valve, a second flowmeter 66 and a second temperature sensor 63 are provided on the second hydrogen supply pipeline 42. The second flowmeter 66 is used to detect the flow rate of supercooled hydrogen in the second hydrogen supply pipeline 42. The second temperature sensor 63 is located at the outlet of the second cold bath chamber 41. According to the data fed back by the second temperature sensor 63, it can be judged whether the supercooling degree of the supercooled hydrogen introduced into the interior of the explosion container 20 meets the preset conditions. If the preset conditions are not met, it is necessary to adjust the hydrogen flow rate in the second hydrogen supply pipeline 42 to extend the cooling time, or replace / cool the cooling medium in the second cold bath chamber 41.

[0071] Furthermore, the outlet of the second hydrogen supply pipeline 42 is located at the bottom of the explosion container 20 and is provided with an injector to inject supercooled hydrogen into the explosion container 20. In this way, the injector can be used to increase the kinetic energy of the supercooled hydrogen, which helps the supercooled hydrogen to diffuse in the hydrogen-oxygen mixed gas.

[0072] Specifically, the hydrogen flowing through the second hydrogen supply pipeline 42 undergoes subcooling bath in the second cold bath chamber 41 carrying liquid neon, and then enters the explosion container 20 from both side walls until it reaches the bottom of the explosion container 20. Liquid neon (boiling point -246 °C) is used as the cold source for subcooled hydrogen, and through the fine hole injection method, it is diffused again with the hydrogen-oxygen mixed gas already filled in the explosion container 20.

[0073] It should be noted that the parameters such as the initial pressure, temperature, and concentration during the explosion in the explosion container 20 can be adjusted according to the requirements of the test conditions, realizing the test of cold hydrogen explosion parameters under different conditions. For example, the initial pressure during the explosion can be adjusted by adjusting the hydrogen intake of the first gas supply device 30 and the second gas supply device 40 according to the data fed back by the pressure sensor 64. In addition, it can be understood that the initial pressure during the explosion is almost determined by the gas supply volume of the first gas supply device 30. The ambient temperature can be adjusted by changing the amount of liquid nitrogen and the spraying time. The temperature of the subcooled hydrogen can be adjusted by changing the flow rate of the second hydrogen supply pipeline 42, and the pre-cooling time is ensured by measuring the temperature at the outlet of the second cold bath chamber 41. Even if necessary, a heating wire can be wound around the surface of the pipeline of the second hydrogen supply pipeline 42 at the outlet of the second cold bath chamber 41 for temperature increase control. The main part affecting the concentration is determined by the first gas supply device 30. The proportional partial pressure of the gas source before the mixer 331 is changed, and it is determined in the gas chromatography analysis link. Specifically, the sample hydrogen, oxygen, or air is pressed into the mixing container at a predetermined proportional partial pressure, and after stirring, the concentration of hydrogen is analyzed by gas chromatography to more accurately measure the concentration of hydrogen in the pre-mixed gas. The secondary part can be determined by the volume correspondingly increased according to the hydrogen flow rate detected in the second gas supply device 40.

[0074] The above description is only a preferred embodiment of the present invention and does not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiment, it is not intended to limit the present invention. Any person familiar with the present invention can make some changes or modifications to equivalent embodiments by using the technical content prompted above within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the present invention's solution.

Claims

1. A cold hydrogen explosion parameter testing system, characterized in that: include: Vacuum insulated container, used to provide an insulating environment; An explosion container, arranged in the adiabatic environment, for conducting a test of cold hydrogen explosion parameters to be tested; A first gas supply device, connected to the explosion container, for supplying a low-temperature hydrogen-oxygen mixed gas into the explosion container so that the hydrogen concentration in the explosion container reaches a preset value; as well as The second gas supply device is connected to the explosion container and is used to supply supercooled hydrogen into the explosion container. The supercooled hydrogen diffuses in the low-temperature hydrogen-oxygen mixed gas to form the cold hydrogen to be tested.

2. The cold hydrogen explosion parameter testing system according to claim 1, characterized in that: The second air supply device comprises: A second cold bath chamber, for providing a supercooled environment; and A second hydrogen supply pipeline, the outlet of the second hydrogen supply pipeline leads to the interior of the explosion container, the inlet of the second hydrogen supply pipeline is connected to a hydrogen source, wherein a portion of the second hydrogen supply pipeline is located in the second cold bath chamber to provide supercooling for the hydrogen.

3. The cold hydrogen explosion parameter testing system according to claim 2, characterized in that: The outlet of the second hydrogen supply pipeline is located at the bottom of the explosion container and is provided with an injector to inject supercooled hydrogen into the explosion container.

4. The cold hydrogen explosion parameter testing system according to claim 2, characterized in that: The cooling medium in the second cold bath chamber is liquid neon.

5. The cold hydrogen explosion parameter testing system according to any one of claims 1 to 4, characterized in that: An igniter for igniting the cold hydrogen to be tested and an ultraviolet detector for detecting the spark of the igniter are arranged in the explosion container.

6. The cold hydrogen explosion parameter testing system according to any one of claims 1 to 4, characterized in that: The first air supply device comprises: A first cold bath chamber, used to provide a pre-cooling environment; and A first hydrogen supply pipeline, the outlet of the first hydrogen supply pipeline leads to the interior of the explosion container, the inlet of the first hydrogen supply pipeline is connected to the hydrogen-oxygen mixing container, wherein a portion of the first hydrogen supply pipeline is located in the first cold bath chamber to provide pre-cooling for the hydrogen.

7. The cold hydrogen explosion parameter testing system according to claim 6, characterized in that: The cooling medium in the first cold bath chamber is dry ice-acetone.

8. A cold hydrogen explosion parameter testing method, applicable to the cold hydrogen explosion parameter testing system as claimed in any one of claims 1 to 7, characterized in that: include: Precooling and vacuuming the explosion container; Supplying low-temperature hydrogen-oxygen mixed gas into the explosion container so that the hydrogen concentration in the explosion container reaches a preset value; as well as Supercooled hydrogen is supplied into the explosion container, so that the supercooled hydrogen diffuses in the low-temperature hydrogen-oxygen mixed gas to form cold hydrogen to be tested.

9. The cold hydrogen explosion parameter testing method according to claim 8, characterized in that: The preset value is the maximum hydrogen concentration of the low-temperature hydrogen-oxygen mixed gas in the explosion container without causing an explosion.

10. The cold hydrogen explosion parameter testing method according to claim 8, characterized in that: While supplying supercooled hydrogen into the explosion container, continuous pulse ignition is started, and an ultraviolet detector is used to detect explosion sparks.

Images