Multi-working-condition ortho-parahydrogen conversion test device

Abstract

The utility model provides a multi-working-condition ortho-parahydrogen conversion test device, which relates to the technical field of ultra-low temperature and comprises an ultra-low-temperature vacuum cold box with a reversible sealing function, and a pre-cooling heat exchanger and an ortho-parahydrogen conversion heat exchanger which are arranged in the ultra-low-temperature vacuum cold box, the pre-cooling heat exchanger is provided with a pre-cooling cold source channel and a pre-cooling channel; the pre-cooling cold source channel is used for providing a cold source for the pre-cooling heat exchanger; the pre-cooling channel is used for cooling raw material hydrogen to a first temperature zone; a conversion channel and a conversion cold source channel are arranged in the ortho-parahydrogen conversion heat exchanger; the conversion channel is filled with a catalyst for promoting conversion of ortho-hydrogen into parahydrogen, and the pre-cooling channel and the conversion channel are sequentially connected; the conversion cold source channel is used for providing a cold source for the ortho-parahydrogen conversion heat exchanger and cooling the raw material hydrogen to a second temperature zone. The ortho-parahydrogen conversion heat exchanger integrates ortho-parahydrogen conversion and heat exchange functions, can promote conversion of ortho-hydrogen into parahydrogen in the raw material hydrogen, and takes away conversion heat in the conversion process, so that a continuous catalytic conversion test can be carried out.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of ultralow temperature technology, especially to a multi-working-condition normal and para hydrogen conversion test device. BACKGROUND

[0002] Hydrogen can be produced from fossil energy, industrial by-product gas, water and other hydrogen-containing substances, and is an important industrial raw material and energy carrier. Hydrogen energy refers to the energy released by hydrogen in the process of physical and chemical changes, which can be used in industry, power generation, energy storage, transportation fuel, and other fields such as natural gas for industrial and domestic fuel.

[0003] Hydrogen mainly exists in the form of a compound, and the usual elemental form is hydrogen gas (H2). Liquid hydrogen is a deep-cooled hydrogen storage method. After compression, hydrogen gas is cooled to below 21 K to become liquid hydrogen, which is then stored in specially designed adiabatic vacuum containers. The density of liquid hydrogen at normal temperature and pressure is 845 times that of gaseous hydrogen, and the volumetric energy density of liquid hydrogen is also several times higher than that of compressed storage, greatly increasing the hydrogen storage capacity of the same volume of hydrogen storage container, and is expected to become the main form of large-scale transportation.

[0004] Normal and para hydrogen conversion is one of the key steps of hydrogen liquefaction. The hydrogen molecule H2, composed of two atoms, has two states due to the different spin directions of the two hydrogen nuclei. The spin direction of normal hydrogen (o-H2) is the same, and the spin direction of para hydrogen (p-H2) is opposite. The equilibrium composition of normal and para states is related to temperature. At room temperature, the equilibrium hydrogen is a mixture containing 75% normal hydrogen and 25% para hydrogen, which is called normal hydrogen (or standard hydrogen), represented by the symbol n-H2. Above room temperature, the equilibrium composition of normal and para states remains unchanged. Below room temperature, the equilibrium composition of normal and para states will change, that is, with the decrease of temperature, the percentage of para hydrogen increases. At standard atmospheric pressure and hydrogen saturation temperature 20.4 K, the para hydrogen concentration of equilibrium hydrogen is 99.8%.

[0005] During the process of hydrogen gradually cooling and liquefying, normal hydrogen will spontaneously convert to para hydrogen and release a large amount of conversion heat, which will cause the vaporization of liquid hydrogen and increase the additional liquefaction energy consumption. This conversion process is not conducive to the long-term storage of liquid hydrogen, and the evaporation loss caused by the conversion heat of normal and para hydrogen can even reach more than 20% of the total storage amount within a day, so a catalyst needs to be added during the liquefaction process to promote the conversion process of normal and para hydrogen. Generally, the para hydrogen content in the liquid hydrogen product is required to be more than 95% to reduce the evaporation loss caused by the conversion of normal and para hydrogen.

[0006] Continuous conversion of normal and para hydrogen is an important step to realize large-scale hydrogen liquefaction. Continuous conversion is to remove the conversion heat of normal and para hydrogen through the cold fluid in the heat exchanger in time, so that the hydrogen gas always maintains the concentration close to the equilibrium hydrogen at the corresponding temperature during the conversion process, and the comprehensive energy consumption of the hydrogen liquefaction system is low.

[0007] From the above, to build a multi-temperature zone variable working condition primary and secondary hydrogen continuous catalytic conversion characteristics test system which can simulate the actual industrial production, to test the continuous catalytic conversion performance of hydrogen in the ultra-low temperature environment of liquid hydrogen temperature zone, catalyst performance and other data, can provide important reference for the design, use and maintenance of primary and secondary hydrogen conversion heat exchanger, so as to promote the development of large-scale hydrogen liquefaction device in gas industry.

[0008] The multi-temperature zone variable working condition primary and secondary hydrogen continuous catalytic conversion characteristics test system should include a multi-working condition primary and secondary hydrogen conversion test device for primary and secondary hydrogen conversion, and the design of the multi-working condition primary and secondary hydrogen conversion test device is a key link, and the purpose of the present application is to provide a multi-working condition primary and secondary hydrogen conversion test device.

[0009] The information disclosed in the background section is only intended to deepen the understanding of the overall background of the present application, and should not be regarded as acknowledging or implying in any form that the information constitutes the prior art known to those skilled in the art. Content of the present application

[0010] In view of the above, the present application provides a multi-working condition primary and secondary hydrogen conversion test device, which integrates primary and secondary hydrogen conversion and heat exchange functions in the primary and secondary hydrogen conversion heat exchanger 13 of the multi-working condition primary and secondary hydrogen conversion test device, so as to promote the conversion of primary hydrogen in raw hydrogen to secondary hydrogen, and at the same time, take away the conversion heat in the above conversion process, so as to carry out continuous catalytic conversion test.

[0011] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0012] The present application provides a multi-working condition primary and secondary hydrogen conversion test device, which comprises: an ultra-low temperature vacuum cold box with reversible sealing function, and a pre-cooling heat exchanger and a primary and secondary hydrogen conversion heat exchanger arranged in the ultra-low temperature vacuum cold box.

[0013] The pre-cooling heat exchanger has a pre-cooling cold source channel and a pre-cooling channel.

[0014] The pre-cooling cold source channel is used for providing a cold source for the pre-cooling heat exchanger.

[0015] The pre-cooling channel is used for cooling raw hydrogen to a first temperature zone.

[0016] The primary and secondary hydrogen conversion heat exchanger has a conversion channel and a conversion cold source channel inside.

[0017] The conversion channel is filled with a catalyst for promoting the conversion of primary hydrogen to secondary hydrogen, and the pre-cooling channel and the conversion channel are sequentially connected.

[0018] The conversion cold source channel is used for providing a cold source for the primary and secondary hydrogen conversion heat exchanger, and cooling raw hydrogen to a second temperature zone, which is lower than the first temperature zone.

[0019] In some embodiments of the utility model, the conversion cold source channel and the precooling cold source channel are connected in sequence.

[0020] In some embodiments of the utility model, the ultralow-temperature vacuum cold box is a cylindrical structure, and the top thereof is connected with a matched inlet and outlet pipeline through a forced sealing flange.

[0021] In some embodiments of the utility model, the primary and secondary hydrogen conversion heat exchanger is a plate-fin heat exchanger.

[0022] In some embodiments of the utility model, the precooling heat exchanger is a plate-fin heat exchanger.

[0023] In some embodiments of the utility model, the precooling heat exchanger further has a precooling and reheating channel, and the conversion channel and the precooling and reheating channel are connected in sequence.

[0024] In some embodiments of the utility model, temperature measuring points are arranged at the inlet and outlet of the conversion channel.

[0025] In some embodiments of the utility model, temperature measuring points are arranged at the inlet and outlet of the conversion channel.

[0026] In some embodiments of the utility model, resistance measuring points are arranged at the inlet and outlet of the conversion channel.

[0027] In some embodiments of the utility model, the precooling heat exchanger and the primary and secondary hydrogen conversion heat exchanger are detachably arranged in the ultralow-temperature vacuum cold box.

[0028] The utility model embodiment has at least the following advantages or beneficial effects:

[0029] 1. The primary and secondary hydrogen conversion heat exchanger has a conversion channel and a conversion cold source channel inside, the conversion channel is filled with a catalyst for promoting the conversion of primary hydrogen into secondary hydrogen, and the conversion cold source channel is connected with a precooling cold source channel, that is, the primary and secondary hydrogen conversion heat exchanger integrates the functions of primary and secondary hydrogen conversion and heat exchange, can promote the conversion of primary hydrogen in raw hydrogen into secondary hydrogen, and at the same time, take away the conversion heat in the above conversion process, so as to carry out continuous catalytic conversion test.

[0030] 2. Through the arrangement of the ultralow-temperature vacuum cold box, the multi-working-condition primary and secondary hydrogen conversion test device can be used in a high-vacuum and low-radiation environment, the primary and secondary hydrogen conversion heat exchanger device is precooled by a cold source (liquid hydrogen), and an ultralow-temperature test environment is created for the primary and secondary hydrogen conversion heat exchanger.

[0031] 3. Through the arrangement of the ultralow-temperature vacuum cold box, a dynamic high-vacuum environment can be established for the multi-working-condition primary and secondary hydrogen conversion test device (the internal cavity of the ultralow-temperature vacuum cold box), so as to ensure that the multi-temperature zone condition of liquid hydrogen is realized, and thus the required multi-temperature zone environment for test is provided.

[0032] Other features and advantages of the present application will be set forth in the following description of the application, and in part will become apparent to those skilled in the art upon examination of the following or can be learned by practice of the application. The application will be described with reference to the drawings in which: BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiment description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0034] Figure 1 It is a structure schematic view of a multi-temperature-zone variable-condition primary and secondary hydrogen continuous catalytic conversion characteristic test system.

[0035] Icon:

[0036] 1-multi-condition primary and secondary hydrogen conversion test device, 11-ultra-low temperature vacuum cold box, 12-precooling heat exchanger, 121-precooling cold source channel, 122-precooling channel, 123-precooling reheat channel, 13-primary and secondary hydrogen conversion heat exchanger, 131-conversion channel, 132-conversion cold source channel,

[0037] 2-control analysis device, 21-liquid hydrogen pipeline, 22-low-pressure liquid hydrogen vaporizer, 23-feed hydrogen pipeline, 24-analysis interface, 25-nitrogen pipeline, 26-nitrogen heater, 27-emptying main pipe,

[0038] 3-assistant device, 31-molecular pump group. DETAILED DESCRIPTION

[0039] In the following, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the embodiments of the present application.

[0040] In the embodiments of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, or detachable connection, or integrated; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0041] The embodiments of the present application will be described in detail below with reference to the drawings.

[0042] ReferenceFigure 1 The embodiment provides a multi-temperature-zone variable working condition primary and secondary hydrogen continuous catalytic conversion characteristic test system, which comprises a multi-working condition primary and secondary hydrogen conversion test device 1, a control analysis device 2 and an auxiliary device 3.

[0043] The multi-working condition primary and secondary hydrogen conversion test device 1 is used for cooling raw hydrogen gas to a first temperature zone (for example, a 35 K temperature zone) first, and then promoting the conversion of primary hydrogen in the raw hydrogen gas into secondary hydrogen through a primary and secondary hydrogen conversion heat exchanger 13 and cooling the raw hydrogen gas to a second temperature zone (for example, a 28 K temperature zone). The multi-working condition primary and secondary hydrogen conversion test device 1 comprises an ultralow-temperature vacuum cold box 11 with a reversible sealing function (openable and closable), and a precooling heat exchanger 12 and the primary and secondary hydrogen conversion heat exchanger 13 which are detachably arranged in the ultralow-temperature vacuum cold box 11.

[0044] The inside of the ultralow-temperature vacuum cold box 11 can form a dynamic vacuum environment. The ultralow-temperature vacuum cold box 11 is in a cylindrical structure, and the top thereof is connected with a matched inlet and outlet pipeline through a forced sealing flange, so that the multi-working condition primary and secondary hydrogen conversion test device 1 can be integrally disassembled and replaced under the premise of ensuring extremely low leakage.

[0045] The precooling heat exchanger 12 is used for cooling raw hydrogen gas in a raw hydrogen gas pipeline 23 to the first temperature zone. In a specific implementation scenario, the precooling heat exchanger 12 is a plate-fin heat exchanger, and can realize multi-channel heat exchange and has good heat exchange effect. The precooling heat exchanger 12 has a precooling cold source channel 121, a precooling channel 122 and a precooling reheat channel 123.

[0046] The precooling cold source channel 121 is used for conveying liquid hydrogen; the precooling heat exchanger 12 uses liquid hydrogen as a cold source.

[0047] The precooling channel 122 is used for cooling raw hydrogen gas in the raw hydrogen gas pipeline 23 to the first temperature zone.

[0048] The precooling reheat channel 123 is used for reheat the gas discharged after conversion of the primary and secondary hydrogen conversion heat exchanger 13; the conversion channel 131 and the precooling reheat channel 123 are sequentially connected.

[0049] The primary and secondary hydrogen conversion heat exchanger 13 is used for promoting the conversion of primary hydrogen in raw hydrogen gas into secondary hydrogen, and cooling the raw hydrogen gas to the second temperature zone by taking away the conversion heat in the conversion process; the second temperature zone is lower than the first temperature zone. In a specific implementation scenario, the primary and secondary hydrogen conversion heat exchanger 13 is a plate-fin heat exchanger, and can realize multi-channel heat exchange and has good heat exchange effect; the primary and secondary hydrogen conversion heat exchanger 13 is detachably arranged in the ultralow-temperature vacuum cold box 11. The primary and secondary hydrogen conversion heat exchanger 13 has a conversion channel 131 and a conversion cold source channel 132 inside.

[0050] The conversion passage 131 is filled with a catalyst for promoting the conversion of ortho-hydrogen into para-hydrogen, and the pre-cooling passage 122 is connected in sequence with the conversion passage 131. The catalyst is not limited in the way of filling. Temperature measuring points are arranged at the inlet and outlet of the conversion passage 131. Resistance measuring points are arranged at the inlet and outlet of the conversion passage 131.

[0051] The conversion cold source passage 132 is connected in sequence with the pre-cooling cold source passage 121. The para-ortho hydrogen conversion heat exchanger 13 uses liquid hydrogen as a cold source. In this embodiment, preferably, the para-ortho hydrogen conversion heat exchanger 13 and the pre-cooling heat exchanger 12 use the same cold source in sequence. Temperature measuring points are arranged at the inlet and outlet of the conversion cold source passage 132.

[0052] All hydrogen outlets of the multi-condition para-ortho hydrogen conversion test device 1 are connected with the venting main pipe 27, and the exhaust gas discharged from the multi-condition para-ortho hydrogen conversion test device 1 is vented. It can be understood that, in order to realize safe venting, the exhaust gas can be reheated by a corresponding heat exchange device before venting.

[0053] The working principle of the multi-condition para-ortho hydrogen conversion test device 1 is as follows: the raw hydrogen gas passes through the raw hydrogen gas pipeline 23 and the pre-cooling passage 122, enters the conversion passage 131, and is converted into para-hydrogen under the action of the catalyst, and then is reheated by the pre-cooling and reheating passage 123, and is finally vented through the venting main pipe 27. In the above process, the conversion heat generated is taken away by the liquid hydrogen, so as to realize continuous catalytic conversion. By continuously detecting the para-hydrogen content in the gas before and after the conversion of the para-ortho hydrogen conversion heat exchanger 13, and combining the test operation parameters, the catalytic reaction rate and space velocity of the para-ortho hydrogen conversion heat exchanger 13 can be calculated. In addition, the resistance characteristics of the conversion passage 131 of the para-ortho hydrogen conversion heat exchanger 13 after being filled with the catalyst can be analyzed through the resistance measuring points at the inlet and outlet of the conversion passage 131. The heat exchange performance of the para-ortho hydrogen conversion heat exchanger 13 can be comprehensively analyzed through the temperature measuring points arranged at each inlet and outlet of the para-ortho hydrogen conversion heat exchanger 13.

[0054] The control and analysis device 2 is used to provide raw hydrogen gas with a specified para-ortho hydrogen ratio to the multi-condition para-ortho hydrogen conversion test device 1, provide a cold source to the multi-condition para-ortho hydrogen conversion test device 1, provide a multi-temperature zone environment for the test, and detect and analyze the para-hydrogen content in the gas before and after the conversion of the para-ortho hydrogen conversion heat exchanger 13. The control and analysis device can adjust the para-ortho hydrogen ratio in the raw hydrogen gas and the temperature zone in which the raw hydrogen gas is converted into para-hydrogen. The control and analysis device 2 comprises a liquid hydrogen pipeline 21, a low-pressure liquid hydrogen vaporizer 22, a raw hydrogen gas pipeline 23, an analysis interface 24, a nitrogen pipeline 25, a nitrogen heater 26, and a venting main pipe 27.

[0055] The liquid hydrogen pipeline 21, the conversion cold source passage 132, the pre-cooling cold source passage 121, and the venting main pipe 27 are connected in sequence. In a specific implementation scenario, the outlet of the conversion cold source passage 132 can also be directly connected with the venting main pipe 27.

[0056] The liquid phase inlet of the low-pressure liquid hydrogen vaporizer 22 is connected with the liquid hydrogen pipeline 21, and the low-pressure liquid hydrogen vaporizer 22 vaporizes the liquid hydrogen to obtain liquid hydrogen vapor; the gas phase outlet of the low-pressure liquid hydrogen vaporizer 22 is directly or indirectly connected with the raw hydrogen pipeline 23 and the conversion cold source channel 132.

[0057] The raw hydrogen pipeline 23, the pre-cooling channel 122, the conversion channel 131, the pre-cooling and reheating channel 123 and the venting main pipeline 27 are sequentially connected.

[0058] The analysis interface 24 is used to connect an analysis device, which is used to detect the content of para-hydrogen in the gas before and after the conversion of the para-para hydrogen conversion heat exchanger 13, and detect the water content in the system pipeline; the purpose of testing the water content is to check and confirm the purging effect of the pipeline of the entire system. In a specific implementation scenario, the analysis device includes a para-para hydrogen content chromatographic analyzer and a dew point instrument; the para-para hydrogen content chromatographic analyzer is used to continuously detect the content of para-hydrogen in the gas before and after the conversion of the para-para hydrogen conversion heat exchanger 13; the dew point instrument is used to continuously detect the water content in the system pipeline.

[0059] The nitrogen pipeline 25 is used to provide nitrogen for purging the specified pipeline and activating the catalyst in the conversion channel 131, wherein the purpose of purging the specified pipeline is to discharge water vapor and prevent freezing. In a specific implementation scenario, the raw hydrogen pipeline 23, the liquid hydrogen pipeline 21, the conversion channel 131 and the venting main pipeline 27 are all connected with the nitrogen pipeline 25 to discharge water vapor in the entire system and prevent freezing.

[0060] The nitrogen heater 26 is connected with the nitrogen pipeline 25 and the conversion channel 131 to activate the catalyst in the conversion channel 131 by using heated nitrogen. In a specific implementation scenario, the nitrogen heater 26 is an electric heater.

[0061] The working principle of the control analysis device 2 is as follows: the catalyst in the conversion channel 131 is activated by using heated nitrogen. The specified pipeline is purged by using the nitrogen pipeline 25 to discharge water vapor in the entire system and prevent freezing. By providing the low-pressure liquid hydrogen vaporizer 22 and the matching pipeline, the mixing ratio of the liquid hydrogen vapor in the raw hydrogen can be adjusted, so that the content of para-hydrogen in the raw hydrogen is adjusted, multiple working conditions are provided for the test, the temperature zone for the para-para hydrogen conversion can be adjusted by adjusting the liquid hydrogen flow, multiple temperature zones are provided for the test, and the continuous catalytic conversion performance of the catalyst under multiple working conditions and multiple temperature zones is explored, and the catalytic performance and heat exchange performance of the para-para hydrogen conversion heat exchanger 13 are explored.

[0062] The auxiliary device 3 is used to establish a dynamic high vacuum environment in the internal cavity of the ultra-low temperature vacuum cold box 11, so as to ensure that the multi-temperature zone condition of liquid hydrogen is realized, thereby providing a multi-temperature zone environment for the test. In a specific implementation scenario, the auxiliary device 3 includes a molecular pump group 31 connected with the ultra-low temperature vacuum cold box 11.

[0063] The above devices and components are connected through process pipelines and valves, wherein the low-temperature pipelines and valves are covered with a thermal insulation layer to reduce the cold loss of the entire system.

[0064] In combination with the above, the working principle of the multi-temperature zone variable working condition primary and secondary hydrogen continuous catalytic conversion characteristic test system is as follows:

[0065] The raw hydrogen gas containing a specified primary and secondary hydrogen ratio passes through the raw hydrogen gas pipeline 23 and the pre-cooling channel 122, enters the conversion channel 131, and is converted into secondary hydrogen under the action of the catalyst. After being reheated through the pre-cooling and reheating channel 123, the raw hydrogen gas is discharged through the discharge main pipe 27. In the above process, the conversion heat generated is taken away by the liquid hydrogen, so as to realize continuous catalytic conversion. Before being discharged through the discharge main pipe 27, the secondary hydrogen content in the gas before and after the conversion of the primary and secondary hydrogen conversion heat exchanger 13 is continuously detected through the analysis interface 24, and the catalytic reaction rate and space velocity of the primary and secondary hydrogen conversion heat exchanger 13 can be calculated in combination with the test operation parameters. In addition, the resistance characteristics of the primary and secondary hydrogen conversion heat exchanger 13 after the conversion channel 131 is filled with the catalyst can be analyzed through the resistance measuring points of the inlet and outlet of the conversion channel 131, and the heat exchange performance of the primary and secondary hydrogen conversion heat exchanger 13 can be comprehensively analyzed through the temperature measuring points arranged at the inlet and outlet of the primary and secondary hydrogen conversion heat exchanger 13. The above system can provide a multi-temperature zone and multi-working condition for the test, and obtain the continuous catalytic conversion performance, catalyst performance and heat exchange performance of the raw hydrogen gas in the ultra-low temperature environment of the liquid hydrogen temperature zone, thereby providing an important reference for the design, use and maintenance of the primary and secondary hydrogen conversion heat exchanger 13.

[0066] In combination with the above, the present embodiment has at least the following beneficial effects:

[0067] I. The primary and secondary hydrogen conversion heat exchanger 13 has a conversion channel 131 and a conversion cold source channel 132 inside, the conversion channel 131 is filled with a catalyst for promoting the conversion of primary hydrogen into secondary hydrogen, and the conversion cold source channel 132 is connected with the pre-cooling cold source channel 121. That is, the primary and secondary hydrogen conversion heat exchanger 13 integrates the functions of primary and secondary hydrogen conversion and heat exchange, can promote the conversion of primary hydrogen in the raw hydrogen gas into secondary hydrogen, and take away the conversion heat in the above conversion process, so as to perform a continuous catalytic conversion test.

[0068] II. By the setting of the ultra-low temperature vacuum cold box 11, the multi-working condition normal-parahydrogen conversion test device 1 can be in a high vacuum and low radiation environment, and the normal-parahydrogen conversion heat exchanger 13 device is pre-cooled by a cold source (liquid hydrogen), so as to create an ultra-low temperature test environment for the normal-parahydrogen conversion heat exchanger 13.

[0069] III. By the setting of the ultra-low temperature vacuum cold box 11, the multi-working condition normal-parahydrogen conversion test device 1 (the internal cavity of the ultra-low temperature vacuum cold box 11) can be established by the auxiliary device 3 to establish a dynamic high vacuum environment, so as to ensure that the multi-temperature zone condition of liquid hydrogen is realized, thereby providing the required multi-temperature zone environment for the test.

[0070] It should be noted that in the present embodiment, the first temperature zone is a 35 K temperature zone, and the second temperature zone is a 28 K temperature zone. In other embodiments, the first temperature zone and the second temperature zone can include a specified temperature zone in the 80 K ~ 28 K temperature range. As can be seen from the foregoing, the adjustment of the temperature zone can be realized by adjusting the liquid hydrogen flow.

[0071] IV. As can be seen from the foregoing, the normal-parahydrogen conversion heat exchanger 13 has different catalyst filling modes, and the normal-parahydrogen conversion heat exchanger 13 can be replaced. By replacing the normal-parahydrogen conversion heat exchanger 13 with different catalyst filling modes, the continuous catalytic conversion performance of the catalyst under different catalyst filling modes can be tested, and the catalytic performance and heat exchange performance of the normal-parahydrogen conversion heat exchanger 13 under the liquid hydrogen temperature zone can be tested.

[0072] V. The resistance characteristics of the conversion channel 131 of the normal-parahydrogen conversion heat exchanger 13 after being filled with catalyst can be analyzed through the resistance measuring points of the inlet and outlet of the conversion channel 131. The heat exchange performance of the normal-parahydrogen conversion heat exchanger 13 can be analyzed through the temperature measuring points arranged at each inlet and outlet of the normal-parahydrogen conversion heat exchanger 13, thereby providing important reference for the design, use and maintenance of the normal-parahydrogen conversion heat exchanger 13. The present application builds a test platform (referring to the above system) for the characteristics of gas in a liquid hydrogen multi-temperature zone ultra-low temperature environment, which has the advantages of wide working condition range, multiple working condition types, simple operation, reliable data, etc.

[0073] VI. The control and analysis device (low-pressure liquid hydrogen vaporizer 22 and matching pipeline) can adjust the mixing ratio of liquid hydrogen vaporization gas in the raw material hydrogen, thereby adjusting the normal-parahydrogen content in the raw material hydrogen, providing multiple working condition conditions for the test, and adjusting the temperature zone (by adjusting the liquid hydrogen flow) of the raw material hydrogen for normal-parahydrogen conversion, providing multiple temperature zone conditions for the test, thereby exploring the continuous catalytic conversion performance of the catalyst in the normal-parahydrogen conversion heat exchanger 13 and the heat exchange performance of the normal-parahydrogen conversion heat exchanger 13 under multiple working condition and multiple temperature zone conditions.

[0074] Finally, it should be noted that: the above is only the preferred embodiment of the utility model, and is not used to limit the utility model, for the skilled person in the art, the utility model can have various changes and changes, in the case of no conflict, the embodiments of the application and the features in the embodiments can be combined with each other arbitrarily. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A multi-condition anodizing experimental apparatus for the conversion of n-parahydrogen, characterized in that, include: An ultra-low temperature vacuum cold box with reversible sealing function, and a pre-cooling heat exchanger and a secondary hydrogen conversion heat exchanger installed inside the ultra-low temperature vacuum cold box; The precooling heat exchanger has a precooling cold source channel and a precooling channel; The precooling cold source channel is used to provide a cold source for the precooling heat exchanger; The precooling channel is used to cool the raw material hydrogen to the first temperature zone; The positive and negative hydrogen conversion heat exchanger has a conversion channel and a conversion cold source channel inside; The conversion channel is filled with a catalyst to promote the conversion of positive hydrogen to secondary hydrogen, and the precooling channel is connected to the conversion channel in sequence. The conversion cold source channel is used to provide a cold source for the positive and negative hydrogen conversion heat exchanger and cool the raw material hydrogen to a second temperature zone, which is lower than the first temperature zone.

2. The multi-condition positive-negative hydrogen conversion test apparatus according to claim 1, characterized in that, The conversion cold source channel is connected to the pre-cooling cold source channel in sequence.

3. The multi-condition ortho-parahydrogen conversion test apparatus according to claim 1, characterized in that, The ultra-low temperature vacuum cold box has a cylindrical structure, and its top is connected to the matching inlet and outlet pipelines through a forced-seal flange.

4. The multi-condition anthocyanin conversion test apparatus according to claim 1, characterized in that, The intermediate hydrogen conversion heat exchanger is a plate-fin heat exchanger.

5. The multi-condition anthocyanin conversion test apparatus according to claim 1, characterized in that, The precooling heat exchanger is a plate-fin heat exchanger.

6. The multi-condition ortho-parahydrogen conversion test apparatus according to claim 1, characterized in that, The precooling heat exchanger also has a precooling and reheating channel, and the conversion channel and the precooling and reheating channel are connected in sequence.

7. The multi-condition anthocyanin conversion test apparatus according to claim 1, characterized in that, Temperature measuring points are installed at both the inlet and outlet of the conversion channel.

8. The multi-condition positive-negative hydrogen conversion test apparatus according to claim 1, characterized in that, Temperature measuring points are installed at both the inlet and outlet of the conversion cold source channel.

9. The multi-condition ortho-parahydrogen conversion test apparatus according to claim 1, characterized in that, Resistance measuring points are installed at both the inlet and outlet of the conversion channel.

10. The multi-condition ortho-parahydrogen conversion test apparatus according to any one of claims 1 to 9, characterized in that, The precooling heat exchanger and the secondary hydrogen conversion heat exchanger can be detachably installed inside the ultra-low temperature vacuum cold box.

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