CN111470472A - But parahydrogen conversion equipment of self-checking - Google Patents
But parahydrogen conversion equipment of self-checking Download PDFInfo
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- CN111470472A CN111470472A CN201910068121.2A CN201910068121A CN111470472A CN 111470472 A CN111470472 A CN 111470472A CN 201910068121 A CN201910068121 A CN 201910068121A CN 111470472 A CN111470472 A CN 111470472A
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 31
- 239000007789 gas Substances 0.000 claims abstract description 63
- 239000001257 hydrogen Substances 0.000 claims abstract description 43
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 43
- 239000003054 catalyst Substances 0.000 claims abstract description 26
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000007788 liquid Substances 0.000 claims abstract description 20
- 238000007689 inspection Methods 0.000 claims abstract description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 9
- 238000013094 purity test Methods 0.000 claims abstract description 4
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 8
- 230000003197 catalytic effect Effects 0.000 abstract description 6
- 125000004435 hydrogen atom Chemical group [H]* 0.000 abstract description 5
- 238000002360 preparation method Methods 0.000 description 4
- 238000001069 Raman spectroscopy Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 238000009903 catalytic hydrogenation reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000004868 gas analysis Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000004071 biological effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000543 intermediate Substances 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000003380 propellant Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
- 230000009967 tasteless effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/14—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature
- G01N27/18—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature caused by changes in the thermal conductivity of a surrounding material to be tested
- G01N27/185—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature caused by changes in the thermal conductivity of a surrounding material to be tested using a catharometer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/32—Hydrogen storage
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- Analytical Chemistry (AREA)
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Abstract
The invention relates to a complete mechanical device for converting common hydrogen at normal temperature into secondary hydrogen and being provided with a detection system, which comprises a vacuum gas path system, a catalytic conversion device, a purity detection device and a gas storage cylinder; the vacuum gas circuit system consists of a mechanical pump, a gas circuit and a plurality of valves, and hydrogen enters the vacuum gas circuit to be prevented from being polluted by air in the vacuum gas circuit by controlling the valves; the catalytic conversion device consists of a cold pump and a catalyst, common hydrogen generates secondary hydrogen through the low-temperature catalyst, and the flow rate is controlled through a flowmeter so as to ensure the catalytic efficiency; the purity testing device measures the gas purity by adding liquid nitrogen and using a thermal conductivity method; the prepared pure parahydrogen gas is stored in an aluminum gas cylinder to prolong the service life of the gas. The invention can quantitatively convert common hydrogen into parahydrogen, and is a set of normal parahydrogen conversion device integrating conversion and purity inspection.
Description
Technical Field
The invention relates to a positive and secondary hydrogen conversion device capable of self-checking.
Background
Hydrogen is a very combustible, colorless, transparent, odorless and tasteless gas. Hydrogen has important applications in hydrogen biological effects, industry, medicine, fuel applications, and other industries. The hydrogen has solid-liquid-gas three states, wherein the liquid hydrogen has the advantages of convenient storage and large gasification expansion rate, and is one of the important modes for storing the hydrogen energy. Liquid hydrogen is generally used as a carrier rocket propellant, and in recent years, the liquid hydrogen is also applied to a superconducting magnetic energy storage technology.
Hydrogen molecules have two forms, orthohydrogen and parahydrogen, in which two hydrogen atoms having the same spin direction are called orthohydrogen, and two hydrogen atoms having opposite spin directions are called parahydrogen. Para-hydrogen induced polarization (PHIP) technology, in which para-hydrogen is generated due to its unique polarization characteristics, has been applied to various fields of chemistry, medicine, and biology. For example, para-hydrogen can be used as a diagnostic tool for catalytic hydrogenation reactions, and can detect a very small amount of catalytic intermediates in the catalytic hydrogenation reaction. Para-hydrogen is also a medium for laser Raman conversion, and the stimulated rotating Raman scattering generated by taking para-hydrogen as the medium can generate tunable laser with a wave band of 16um, and has important application in laser chemistry and spectrum science. Para-hydrogen is also an important link in the liquid hydrogen preparation process, and the raw material for preparing the liquid hydrogen requires that the content of the para-hydrogen is more than 95 percent.
Under natural conditions, hydrogen molecules are composed of two parts, para-hydrogen molecules and ortho-hydrogen molecules, and the ratio of the para-hydrogen molecules to the ortho-hydrogen molecules is 1: 3. Para-hydrogen has an anti-symmetric nuclear spin structure and only corresponds to energy levels with even number of rotation quantum numbers; positive hydrogen has a symmetric nuclear spin structure and corresponds to energy levels with an odd number of rotational quanta. According to the selection rule, the transition between orthohydrogen and parahydrogen is forbidden. However, due to the weak interaction between nuclear spins and electrons, intermolecular collisions can lead to a transition between para-hydrogen and ortho-hydrogen, but this process often takes several months and the transition occurs at a sustained low temperature.
There are three ways of catalytic conversion of para-hydrogen: single stage liquid phase conversion, multi-stage conversion, and continuous conversion. Reactors for performing orthonormal hydrogen conversion generally have three types, namely, adiabatic type, isothermal type and continuous type. The adiabatic reactor needs no external cold source for cooling, and has simple process and high heat transfer rate. Isothermal reactors have the habit of containing a catalyst and ensure the reaction process by liquid nitrogen or liquid hydrogen. The continuous reactor, also called a constant-driving-force reactor, is actually a heat exchanger filled with a catalyst. The feedstock is cooled by heat exchange with a cold gas stream. The traditional para-hydrogen conversion technology needs expensive liquid nitrogen or liquid helium as a cooling substance, and the conversion process cannot detect the purity at any time. The detection of hydrogen is also generally performed by a chromatographic analyzer or by a raman laser as a detection tool, which requires complicated equipment and cost. Thermal conductivity methods are effective methods for gas analysis, but conventional gas analysis instruments have difficulty measuring molecules of para-hydrogen that are sensitive to thermal conductivity at 175K temperatures.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a positive-secondary conversion device for hydrogen.
An orthohydrogen conversion device capable of self-checking comprises a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve, a fifth valve, a sixth valve,
the catalyst is arranged in a metal tube with an opening at one end and the other end, and the outer wall surface of the metal tube is attached to the cold head of the cold pump;
the metal pipe and the cold head of the cold pump are both positioned in a closed cavity, two open ends of the metal pipe respectively penetrate through the wall surface of the cavity and extend out of the cavity, one open end of the metal pipe is sequentially connected with a common hydrogen gas source through a second valve and a first valve through a pipeline, and the other open end of the metal pipe is sequentially connected with a gas cylinder through a third valve and a sixth valve through a pipeline;
the wall surface of the closed cavity is provided with an air exhaust through hole, and the air exhaust through hole is connected with an air inlet of the mechanical pump through a twelfth valve and a pipeline; an air inlet of the mechanical pump is communicated with a connecting pipeline between the second valve and the first valve through a ninth valve and a tenth valve in sequence;
an air inlet of the mechanical pump is connected with a sample gas inlet of the purity testing device through a fourth valve, a fifth valve, an eighth valve and an eleventh valve in sequence through a pipeline;
a connecting pipeline between the ninth valve and the tenth valve and a connecting pipeline between the fifth valve and the eighth valve are respectively connected with a pressure gauge;
and a connecting pipeline between the third valve and the sixth valve is communicated with a connecting pipeline between the fourth valve and the fifth valve.
Vacuumizing a gas circuit system, a cold pump and a storage gas cylinder by using a mechanical pump, reducing the temperature of a catalyst by using a cold head of the cold pump, allowing a target gas to pass through the catalyst at a certain flow rate by using a valve system and a flowmeter, and storing converted para-hydrogen into a gas cylinder; and the separated common hydrogen and the prepared parahydrogen enter a purity inspection device by using a valve system to realize purity measurement.
The granular catalyst is arranged in the copper pipe with the opening at the first end and the second end, and the copper pipe is wound on the outer wall surface of the columnar cold head of the cold pump, so that the cold pump can directly cool the catalyst.
The cold head and the catalyst pipeline are both in a vacuum environment, and the temperature is monitored to be reduced to below 21K by using the temperature.
The purity inspection device consists of an external voltage-stabilizing direct-current power supply, a liquid nitrogen cooling barrel and a closed gas storage vacuum barrel arranged in the liquid nitrogen cooling barrel; a filament is arranged in the gas storage vacuum barrel, and two ends of the filament are respectively connected with the positive electrode and the negative electrode of the direct current power supply through leads; the gas storage vacuum barrel is provided with a sample gas inlet which is respectively connected with a gas source to be measured and a vacuum pump through a conduit, and the purity of parahydrogen is measured by using a thermal conductivity method.
And a connecting pipeline between the ninth valve and the tenth valve and a connecting pipeline between the fifth valve and the eighth valve are respectively connected with the pressure gauge through a seventh valve.
The cold head of the cold pump is provided with a temperature monitoring element, such as a temperature thermocouple.
And a flow meter is arranged on a connecting pipeline between the third valve and the sixth valve.
The gas cylinder is a storage aluminum gas cylinder.
The preparation principle of the device is similar to that of an isothermal reactor, and the device can realize the conversion of the para-hydrogen and the para-hydrogen only by using electric energy without consuming liquid nitrogen and liquid helium by using a cold pump (also called a cryopump, a cryopump and a condensate pump) for cooling. Meanwhile, the device can continuously prepare the parahydrogen molecules with the purity as high as 97 percent, the parahydrogen gas can be continuously prepared by replacing the storage gas cylinder through a simple switch regulating valve under the condition that the background pressure is prepared for one time under the storage gas cylinder of 200psi, and the purity of the prepared parahydrogen can be maintained almost unchanged for more than two weeks. Meanwhile, the design of the vacuum gas circuit is adopted to realize the preparation process, the gas purity can be checked at any time, the gas purity is guaranteed, the device is a convenient and rapid detection means, and the device is a set of continuous conversion device for the parahydrogen, which can realize self-checking.
The invention has the following advantages and beneficial effects:
1. has the capability of continuously and rapidly preparing parahydrogen.
2. Through flow control, automatic gas preparation can be realized.
3. Possesses the inspection purity function, can realize the purity at any time and detect convenient operation.
In the drawings:
the device comprises a first valve 1, a second valve 2, a third valve 3, a fourth valve 4, a fifth valve 5, a sixth valve 6, a seventh valve 7, an eighth valve 8, a ninth valve 9, a tenth valve 10, an eleventh valve 11, a twelfth valve 12, a cold pump 13, a catalyst 14, a temperature monitoring element 15, a flow meter 16, a mechanical pump 17, a pressure gauge 18, a gas testing device 19, a gas cylinder 20, a common hydrogen gas 21, a secondary hydrogen gas 22, a direct-current stabilized power supply 23, a filament 24 and liquid nitrogen 25.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a diagram showing the structure of the cold pump catalyst according to the present invention.
Fig. 3 is a structural view of the gas inspection apparatus of the present invention.
Figure 4 shows a para-hydrogen thermal conductivity curve for a filament of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
The detailed structure of the cold pump catalyst is shown in fig. 2, a copper pipe filled with the catalyst is wound on a cold head of the cold pump, and the cold head is in contact with the cold head in work to realize the low-temperature working environment of the catalyst. The catalyst needs to be below 25K to effectively realize the catalytic function, wherein the cold head and the pipeline are positioned in the vacuum environment of the cold pump. The catalyst in the line is in a separate vacuum line environment. Wherein the cold pump is Austin Scientific model M600, and the catalyst is Fe3O4The powder has a size of about 1 mm.
The design of the hydrogen inspection device is shown in FIG. 3, and the temperature measurement principle is that the thermal conductivity of para-H2 and normal-H2 is remarkably changed at low temperature (100-200K). The system is specifically shown in the figure, a steel impermeable tank is vacuumized and immersed in liquid nitrogen, a heatable tungsten wire is arranged in the tank, and gas to be measured with the temperature of about 80Torr is filled into the tank cooled by the liquid nitrogen during measurement. Then the tungsten filament is heated by a direct current stabilized voltage power supply, and the temperature of the filament is determined by the voltage application and the environmental heat dissipation capacity. When the same voltage is applied to the filament, the temperature of the filament will be determined entirely by the heat dissipation capacity of the environment around the filament, i.e., the thermal conductivity of the gas filled, and since the temperature of the filament is linearly related to the resistance of the filament, the purity of the gas filled can be measured by measuring the change in resistance of the filament.
Ortho-para hydrogen conversion operating method:
the mechanical pump 17 is turned on, all the first to twelfth valves (1-12) are simultaneously opened, and the pumping line and the cold pump 13 are evacuated to 10-2After Torr, close all other valves, open the twelfth valve 12, open the cold pump 13, until the cold pump temperature is reduced to 20-21K. And then opening the first valve (1) and the second valve (2), putting hydrogen into the catalyst, heating the cold pump at the moment, opening the third valve (3) and the sixth valve (6) after the temperature is reduced to 20-21K, and adjusting the flow meter to control the flow rate so that parahydrogen slowly enters the gas storage bottle. Increasing the back pressure and carefully controlling the flow rate to maintain an indication of the temperature monitoring element 15Keeping below 25K, the common hydrogen can be continuously converted into parahydrogen to enter the storage cylinder. At this time, the gas checking operation can be performed at any time.
The gas inspection operation method comprises the following steps:
pouring liquid nitrogen into the gas inspection device, closing the first, second, third, sixth and twelfth valves (1,2,3,6,12), opening the seventh, eighth and eleventh valves (7,8,11), slowly opening the fifth valve (5), putting 80Torr para-hydrogen into the gas inspection device, and measuring the resistance R of the gas inspection device by using a multimeterDetection of. The fifth valve 5 is closed, the ninth valve 9 is opened, the purity testing device 19 (in the gas storage vacuum tank) is vacuumized by using the mechanical pump 17, and the ninth valve 9 is closed. Slowly opening the tenth valve 10, filling the gas detection device with 80Torr ordinary hydrogen, and measuring the resistance RGeneral purpose. The resistance difference is RD ═ RDetection of-RGeneral purposeAnd by using the calibrated thermal conductivity formula shown in fig. 4, the purity of the gas to be measured P-H2 (%) -11.25 × RD +28.05, and thus the purity of parahydrogen is obtained.
The positive and secondary conversion of hydrogen can be continued by closing all the first to twelfth valves (1-12) and opening the first, second, third, sixth and twelfth valves (1,2,3,6, 12).
A device closing step:
after sufficient gas is prepared, the cold pump is turned off and the power supply is checked for purity. The first, sixth and twelfth valves (1, 6,12) are closed, all other valves are opened, the pipe is evacuated using the mechanical pump 17, and all of the first to twelfth valves (1-12) are closed. After the cold pump is heated, the twelfth valve 12 is opened, the cold pump is vacuumized, and the twelfth valve 12 is closed. The mechanical pump is turned off. The device shutdown ends.
Claims (9)
1. An orthosteric hydrogen conversion device capable of self-checking comprises first to twelfth valves (1-12), a cold pump (13), a catalyst (14), a mechanical pump (17), a pressure gauge, a purity checking device (19) and a gas cylinder, and is characterized in that:
the catalyst is arranged in a metal tube with an opening at one end and the other end, and the outer wall surface of the metal tube is attached to the cold head of the cold pump;
the metal pipe and the cold head of the cold pump are both positioned in a closed cavity, two open ends of the metal pipe respectively penetrate through the wall surface of the cavity and extend out of the cavity, one open end of the metal pipe is connected with a common hydrogen gas source through a second valve (2) and a first valve (1) in sequence through a pipeline, and the other open end of the metal pipe is connected with a gas cylinder (20) through a third valve (3) and a sixth valve (6) in sequence through a pipeline;
the wall surface of the closed chamber is provided with an air exhaust through hole, and the air exhaust through hole is connected with an air inlet of the mechanical pump (17) through a twelfth valve (12) by a pipeline; an air inlet of the mechanical pump (17) is communicated with a connecting pipeline between the second valve (2) and the first valve (1) through a ninth valve (9) and a tenth valve (10) in sequence;
an air inlet of the mechanical pump (17) is connected with a sample gas inlet of the purity testing device (19) through a fourth valve (4), a fifth valve (5), an eighth valve (8) and an eleventh valve (11) in sequence through a pipeline;
a connecting pipeline between the ninth valve (9) and the tenth valve (10) and a connecting pipeline between the fifth valve (5) and the eighth valve (8) are respectively connected with a pressure gauge;
the connecting pipeline between the third valve (3) and the sixth valve (6) is communicated with the connecting pipeline between the fourth valve (4) and the fifth valve (5).
2. An orthopara-hydrogen conversion device according to claim 1, wherein: vacuumizing a gas circuit system, a cold pump and a storage gas cylinder by using a mechanical pump, reducing the temperature of a catalyst by using a cold head of the cold pump, allowing a target gas to pass through the catalyst at a certain flow rate by using a valve system and a flowmeter, and storing converted para-hydrogen into a gas cylinder; and the separated common hydrogen and the prepared parahydrogen enter a purity inspection device by using a valve system to realize purity measurement.
3. An orthopara-hydrogen conversion device according to claim 1, wherein: the granular catalyst is arranged in the copper pipe with the opening at the first end and the second end, and the copper pipe is wound on the outer wall surface of the columnar cold head of the cold pump, so that the cold pump can directly cool the catalyst.
4. An orthopara-hydrogen conversion device according to claim 1 or 3, wherein: the cold head and the catalyst pipeline are both in a vacuum environment, and the temperature is monitored to be reduced to below 21K by using the temperature.
5. An orthopara-hydrogen conversion device according to claim 1, wherein: the purity inspection device consists of an external voltage-stabilizing direct-current power supply, a liquid nitrogen cooling barrel and a closed gas storage vacuum barrel arranged in the liquid nitrogen cooling barrel; a filament is arranged in the gas storage vacuum barrel, and two ends of the filament are respectively connected with the positive electrode and the negative electrode of the direct current power supply through leads; the gas storage vacuum barrel is provided with a sample gas inlet which is respectively connected with a gas source to be measured and a vacuum pump through a conduit, and the purity of parahydrogen is measured by using a thermal conductivity method.
6. An orthopara-hydrogen conversion device according to claim 1, wherein: and a connecting pipeline between the ninth valve (9) and the tenth valve (10) and a connecting pipeline between the fifth valve (5) and the eighth valve (8) are respectively connected with a pressure gauge (18) through a seventh valve (7).
7. An orthopara-hydrogen conversion device according to claim 1, wherein: a temperature monitoring element (15) such as a temperature thermocouple is arranged at the cold head of the cold pump.
8. An orthopara-hydrogen conversion device according to claim 1, wherein:
a flow meter (16) is arranged on a connecting pipeline between the third valve (3) and the sixth valve (6).
9. An orthopara-hydrogen conversion device according to claim 1, wherein: the gas cylinder is a storage aluminum gas cylinder (20).
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| CN201910068121.2A CN111470472A (en) | 2019-01-24 | 2019-01-24 | But parahydrogen conversion equipment of self-checking |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112044457A (en) * | 2020-08-14 | 2020-12-08 | 北京航天试验技术研究所 | Supported orthohydrogen conversion catalyst and preparation method thereof |
| CN112557577A (en) * | 2020-10-22 | 2021-03-26 | 合肥综合性国家科学中心能源研究院(安徽省能源实验室) | System for testing dynamic performance of catalytic conversion of para-hydrogen |
| CN112610891A (en) * | 2020-12-18 | 2021-04-06 | 北京航天试验技术研究所 | Device and method for catalytic conversion of para-hydrogen with activation function |
| CN112808176A (en) * | 2020-12-30 | 2021-05-18 | 同济大学 | Device and method for converting orthoparahydrogen |
| CN113607769A (en) * | 2021-08-24 | 2021-11-05 | 中国科学院精密测量科学与技术创新研究院 | Parahydrogen content detection device and method by utilizing nuclear magnetic resonance |
| CN113984937A (en) * | 2021-12-23 | 2022-01-28 | 北京大臻科技有限公司 | Device and method for testing catalytic performance of catalyst for para-hydrogen reaction |
| CN114113472A (en) * | 2021-11-11 | 2022-03-01 | 国网安徽省电力有限公司电力科学研究院 | Method for realizing performance test of catalytic conversion reaction of multiple para-hydrogen |
| CN115325774A (en) * | 2022-06-23 | 2022-11-11 | 北京航天试验技术研究所 | Small-sized hydrogen liquefying device and method for segmented conversion of orthohydrogen and parahydrogen by adopting low-temperature cooler |
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