CN112557577A - System for testing dynamic performance of catalytic conversion of para-hydrogen - Google Patents
System for testing dynamic performance of catalytic conversion of para-hydrogen Download PDFInfo
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- CN112557577A CN112557577A CN202011142427.7A CN202011142427A CN112557577A CN 112557577 A CN112557577 A CN 112557577A CN 202011142427 A CN202011142427 A CN 202011142427A CN 112557577 A CN112557577 A CN 112557577A
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 138
- 230000003197 catalytic effect Effects 0.000 title claims abstract description 89
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 82
- 238000012360 testing method Methods 0.000 title claims abstract description 44
- 239000001257 hydrogen Substances 0.000 claims abstract description 91
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 91
- 238000000034 method Methods 0.000 claims abstract description 33
- 230000008569 process Effects 0.000 claims abstract description 31
- 238000005057 refrigeration Methods 0.000 claims abstract description 27
- 238000007906 compression Methods 0.000 claims abstract description 18
- 239000003054 catalyst Substances 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims description 20
- 239000007789 gas Substances 0.000 claims description 20
- 230000006835 compression Effects 0.000 claims description 16
- 238000005259 measurement Methods 0.000 claims description 16
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 12
- 238000011049 filling Methods 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 22
- 239000007788 liquid Substances 0.000 abstract description 16
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 11
- 239000001307 helium Substances 0.000 abstract 2
- 229910052734 helium Inorganic materials 0.000 abstract 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 abstract 2
- 230000001105 regulatory effect Effects 0.000 description 16
- 238000009529 body temperature measurement Methods 0.000 description 5
- 238000009530 blood pressure measurement Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 150000002431 hydrogen Chemical class 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/10—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using catalysis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
Abstract
The invention discloses a system for testing the dynamic performance of catalytic conversion of ortho-para-hydrogen, wherein a working medium compression process obtains a high-pressure normal-temperature working medium from a low-pressure normal-temperature working medium through a compressor and a cooler, a refrigeration cycle process obtains low-temperature working media in different temperature regions from the high-pressure normal-temperature working medium through liquid nitrogen precooling, expansion refrigeration and a working medium mixer, the catalytic conversion process of the ortho-para-hydrogen precools hydrogen to a required working condition and then carries out the conversion of the ortho-para-hydrogen through a catalyst, and the test analysis of the catalytic conversion performance of the ortho-para-hydrogen is realized through; the invention provides low-temperature working media under different working conditions by using normal-temperature helium of an inverted Brayton refrigerator, low-temperature helium in 80K, 30K and 20K isothermal zones and a mixer with a heater. The device and the method have the function of being suitable for testing the dynamic performance of the full working condition of the catalytic conversion of the para-hydrogen under different pressures, temperatures and flow rates in the large-scale hydrogen liquefaction process and the dynamic performance under the working condition conversion.
Description
Technical Field
The invention belongs to the technical field of hydrogen liquefaction, and particularly relates to a system for testing dynamic performance of catalytic conversion of para-hydrogen.
Background
The hydrogen can be used as an ideal carrier of multi-path energy sources and is an important bridge for the transition from fossil energy sources to renewable energy sources. The hydrogen is used as a secondary energy source, has the advantages of various sources, cleanness, low carbon, flexibility, high efficiency, rich application scenes and the like, and is an important direction for constructing a modern energy system.
The infrastructure of the hydrogen energy industry is a precondition for developing the hydrogen energy industry, and hydrogen storage and transportation are important links of the infrastructure of the hydrogen energy industry. The liquid hydrogen storage mode is adopted, and the device has the advantages of high hydrogen storage density, large hydrogen storage capacity, small hydrogen storage occupied area and the like. For long-distance and large-capacity occasions, the liquid hydrogen transportation has the economic advantages of low cost and the like.
At ambient conditions, hydrogen gas is present as a mixture of 75% ortho-hydrogen and 25% para-hydrogen, referred to as equilibrium hydrogen. In the process of liquefying hydrogen, liquid hydrogen obtained after normal-temperature hydrogen is directly liquefied is in a non-equilibrium state, and normal hydrogen can be spontaneously converted into parahydrogen. The heat released by the conversion of para-hydrogen is greater than the latent heat of vaporization of liquid hydrogen, resulting in the vaporization of stored liquid hydrogen. Within 24 hours, liquid hydrogen is lost to evaporation by about 18%. In order to extend liquid hydrogen shelf life without detriment, it is necessary to use a catalyst to accelerate the rate of conversion of para-hydrogen during liquefaction of the hydrogen gas.
In the process of hydrogen liquefaction, multi-stage continuous ortho-para hydrogen catalytic conversion is required to be carried out, and the requirement that the para-hydrogen content is more than 95 percent after the hydrogen is liquefied is met. The existing testing of the catalytic conversion performance of the parahydrogen adopts a mode of soaking a converter in a liquid nitrogen tank with a temperature range of 80K or a liquid hydrogen tank with a temperature range of 20K, only the catalytic conversion performance of the parahydrogen in a static process at a specific temperature can be tested, and the requirement of a continuous catalytic conversion performance test of the parahydrogen with a temperature gradient in a large-scale hydrogen liquefaction process cannot be met.
The catalytic converter for the para-hydrogen of the large-scale hydrogen liquefying device has the operation characteristics of large flow, high flow rate, variable working conditions and the like in the hydrogen liquefying process. The system for testing the dynamic performance of the catalytic conversion of the para-hydrogen, which meets the complex working conditions of the large-scale hydrogen liquefaction process, is designed, and plays an important role in the performance research of the para-hydrogen catalyst, the structural design of a converter, the operation analysis of the catalytic conversion and the like.
Disclosure of Invention
In view of this, the present invention provides a system for testing dynamic performance of catalytic conversion of orthohydrogen suitable for a large-scale hydrogen liquefaction apparatus, which solves the problem of testing efficiency and stability of continuous catalytic conversion of orthohydrogen in a hydrogen liquefaction process, and not only can realize dynamic performance testing of catalytic conversion of orthohydrogen under different conditions of temperature, pressure, flow rate, etc. in the hydrogen liquefaction process, but also can explore an operation mode of catalytic conversion of orthohydrogen in the hydrogen liquefaction process.
A system for testing the dynamic performance of catalytic conversion of para-hydrogen comprises a working medium compression system, a refrigeration cycle system, a hydrogen source to be tested, a catalytic conversion system of para-hydrogen and a measurement control system;
the working medium compression system is used for compressing a low-pressure working medium to a high-pressure working medium and obtaining a high-pressure normal-temperature working medium in a 300-temperature area through cooling;
the refrigeration cycle system is used for sequentially cooling the high-pressure working medium output by the working medium compression system to an 80K temperature zone, a 30K temperature zone and a 20K temperature zone; mixing working media in the 300K temperature region output from the working medium compression system in the 80K temperature region, the 30K temperature region and the 20K temperature region according to requirements to obtain low-temperature working media in required working conditions, and then sending the low-temperature working media into the para-hydrogen catalytic conversion system;
the system comprises a refrigeration cycle system, an orthoparahydrogen catalytic conversion system, a hydrogen source to be detected and an orthohydrogen catalytic conversion system, wherein the orthohydrogen catalytic conversion system is used for performing orthohydrogen catalytic conversion on hydrogen provided by the hydrogen source to be detected under the low-temperature working condition provided by the refrigeration cycle system;
the measurement control system is used for testing the conversion performance of the parahydrogen catalytic conversion system.
Preferably, the refrigeration cycle system comprises a precooling heat exchanger HX1, a preceding heat exchanger HX2, a working medium mixer MIX and a heater H thereof; the precooling heat exchanger HX1 is used for cooling the high-pressure working medium in the 300K temperature zone output by the working medium compression system to the working medium in the 80K temperature zone; the front-stage heat exchanger HX2 is used for cooling a working medium in an 80K temperature zone to a working medium in a 30K temperature zone; the expansion machine T is used for performing expansion refrigeration on the working medium in the 30K temperature zone to obtain the working medium in the 20K temperature zone; the working medium mixer MIX collects working media in an 80K temperature zone, a 30K temperature zone and a 20K temperature zone and a 300K temperature zone high-pressure working medium output by the working medium compression system, and obtains the working medium under the required working condition with the aid of a heater H.
Furthermore, the system also comprises an adsorber for removing impurity gas in the output working medium of the precooling heat exchanger HX 1.
Preferably, the para-hydrogen catalytic conversion system comprises a pre-cooling heat exchanger HX3 and an para-hydrogen catalytic converter O-P;
the precooling heat exchanger HX3 is used for cooling hydrogen provided by a hydrogen source to be tested to a test temperature;
the O-P receives the low-temperature working medium output by the refrigeration cycle system, and realizes the function of converting the para-hydrogen.
Preferably, the para-hydrogen catalytic converter O-P is provided with a hydrogen filtering layer, a catalyst filling port and an evacuation port.
Preferably, the measurement control system is configured to:
measuring the temperature, pressure and flow of the low-temperature working medium output by the refrigeration cycle system;
testing the temperature and pressure of the low-temperature working medium circulated back by the para-hydrogen catalytic conversion system;
testing the temperature, pressure, flow rate and composition of the hydrogen delivered to the para-hydrogen catalytic conversion system;
testing different positions in the conversion process of the para-hydrogen catalytic conversion system and the temperature and the components of the output converted gas;
and testing the pressure differential of the para-hydrogen catalytic conversion system.
The invention has the following beneficial effects:
the adopted reverse Brayton cycle refrigeration technology is mature, the designed system for testing the catalytic conversion performance of the orthohydrogen has comprehensive functions, the test requirements under various working conditions in the actual large-scale hydrogen liquefaction process are met, the system can be used for evaluating and analyzing the catalytic conversion effect of the orthohydrogen in the complicated large-scale hydrogen liquefaction process, and the system plays an important role in research, test and operation of the orthohydrogen catalytic converter used by a large-scale hydrogen liquefaction device. The device is convenient for replacing the parahydrogen catalytic converter to be tested, and has universality.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
V0-V9: regulating valve, FV 1-FV 4: flanged valves, HX 1-HX 3: heat exchanger, H: heaters, FL1 to FL 4: flange connection, 11 ~ 14, 21 ℃; E28. 31-36: working fluid line, N2in、N2out: nitrogen pipeline, 41-47: hydrogen gas circuit, F1, F2: flowmeter, P1-P3: pressure gauge, dP differential pressure gauge, T1-T7: thermometer, A3-a 7: an orthosteric hydrogen analyzer.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
A system for testing dynamic performance of catalytic conversion of parahydrogen is characterized in that: the system comprises a working medium compression system, a refrigeration cycle system, a hydrogen source to be measured, an orthohydrogen catalytic conversion system and a measurement control system;
the working medium compression system comprises:
the compression process of the working medium from a low-pressure state to a high-pressure state, the cooling process of the compressed high-pressure high-temperature working medium from high-pressure to high-pressure and normal-temperature, the pressure regulation process between high-pressure and low-pressure, the supply of the high-pressure normal-temperature working medium and the recovery process of the low-pressure normal-temperature working medium;
the refrigeration cycle system includes:
the method comprises the steps that cold energy of an 80K temperature region provided by liquid nitrogen, cold energy of a low-to-20K temperature region provided by an expansion machine and cold energy of a 30K temperature region realized by cooling of a heat exchanger are provided with low-temperature working media under different working conditions through a regulating valve and a mixer, and the processes of supplying high-pressure normal-temperature working media and recovering low-pressure normal-temperature working media are realized;
the hydrogen source to be tested comprises a high-purity hydrogen source, a hydrogen supply process and a hydrogen recovery process;
the para-hydrogen catalytic conversion system comprises:
the device comprises a cooling process realized by a heat exchanger, a conversion process realized by an ortho-para hydrogen catalytic converter, a hydrogen supply process and a hydrogen recovery process, wherein a low-temperature working medium of the ortho-para hydrogen catalytic converter and hydrogen can be connected by adopting a quick plug, and the ortho-para hydrogen catalytic converter comprises a filter layer, a filling port and a vacuumizing port.
The measurement control system includes:
measuring and controlling process parameters such as temperature and pressure in the process of compressing and cooling the normal-temperature working medium, measuring and controlling process parameters such as pressure, temperature and flow of an inlet and an outlet of the low-temperature working medium, measuring and controlling process parameters such as pressure/pressure difference, temperature and flow of an inlet and an outlet of hydrogen to be measured, and measuring and analyzing the temperature of different positions of the orthohydrogen catalytic converter and the orthohydrogen component of the orthohydrogen catalytic converter.
The working principle is as follows: and (3) adopting an inverse Brayton cycle refrigerator, precooling the high-pressure normal-temperature working medium obtained by the compressor and the cooler by liquid nitrogen, and performing expansion refrigeration to obtain a cold working medium with a temperature range as low as 20K. The working media in different temperature areas pass through the mixer to provide low-temperature working media with different temperatures, pressures, flows and other complex working conditions for testing the para-hydrogen catalytic converter. The high-purity hydrogen to be tested is precooled to the working condition to be tested through the heat exchanger, and the catalytic conversion performance of the para-hydrogen is tested and analyzed by adjusting the temperature, the pressure and the flow of the hydrogen to be tested.
The system for testing the dynamic performance of the catalytic conversion of parahydrogen provided by the invention is described in detail below.
As shown in fig. 1, a system for testing dynamic performance of orthohydrogen catalytic conversion specifically comprises: the device comprises a working medium compression system 1, a refrigeration cycle system 2, a hydrogen source to be measured 3, an orthohydrogen catalytic conversion system 4 and a measurement control system.
Specifically, a system for testing dynamic performance of an orthohydrogen catalytic conversion comprises the following embodiments:
the working medium compression system 1 is provided with a low-pressure gas return path 11, a compressor C, a high-pressure exhaust path 12, a cooler W, a high-pressure gas supply path 13, gas management and the like, wherein the low pressure is generally 0.1-0.2 MPa, and the high pressure is generally 1-1.5 MPa;
the air suction end and the air discharge end of the compressor C are respectively connected to the low-pressure air return circuit 11 and the high-pressure air discharge circuit 12, and the compressor C realizes the function of compressing low-pressure working media to high-pressure working media;
a heat flow inlet and a heat flow outlet of the cooler W are respectively connected with a high-pressure exhaust gas path 12 and a high-pressure gas supply path 13, and the cooler W realizes the function of cooling the compressed and heated high-pressure working medium to a normal temperature state of 300K;
the gas management performs the functions of low pressure PL and high pressure PH control by means of the compressor C and the bypass valve V0, and is connected to the high pressure supply path 21 and the low pressure return path 31 of the refrigeration cycle system 2 through the flanged supply valve FV1 and the return valve FV2, respectively.
The refrigeration cycle system 2 is provided with a precooling heat exchanger HX1, an adsorber A, a preceding heat exchanger HX2, an expander T, a working medium mixer MIX and a heater H thereof, working medium regulating valves of different temperature zones and the like;
the inlet and outlet of a working medium hot flow path of the precooling heat exchanger HX1 are respectively connected to the high-pressure gas supply path 21 and the 80K precooling path 22, and the inlet and outlet of a liquid nitrogen cold flow path of the precooling heat exchanger HX1 are respectively connected to the liquid nitrogen supply path N2inAnd nitrogen purge N2outAn inlet and an outlet of a working medium cold flow path of the precooling heat exchanger HX1 are respectively connected to the low-pressure gas return path 32 and the low-pressure gas return path 31, and the precooling heat exchanger HX1 realizes the function of precooling a high-pressure normal-temperature working medium to an 80K temperature zone through liquid nitrogen and working medium return gas;
the inlet and outlet of the adsorber A are respectively connected to an 80K precooling path 22 and an 80K temperature area path 23, and the adsorber A realizes the function of removing impure gases such as nitrogen, oxygen and the like by a low-temperature adsorption principle;
an inlet and an outlet of a working medium hot flow path of the front-stage heat exchanger HX2 are respectively connected to the 80K temperature zone path 23 and the 30K temperature zone path 24, an inlet and an outlet of a working medium cold flow path of the front-stage heat exchanger HX2 are respectively connected to the 30K temperature zone path 33 and the low-pressure gas return path 32, and the function of cooling the working medium in the 80K temperature zone to the working medium in the 30K temperature zone is realized by the front-stage heat exchanger HX2 through return;
the inlet and the outlet of the expansion machine T are respectively connected to a 30K temperature zone path 25 and a 20K temperature zone path 26, and the expansion machine T achieves the function of cooling the working medium in the 30K temperature zone to the working medium in the 20K temperature zone through expansion refrigeration;
the mixer MIX inlet is connected to a 300K temperature zone circuit 14, an 80K temperature zone circuit 27, a 30K temperature zone circuit 28 and a 20K temperature zone circuit 26, the mixer MIX outlet is connected to a low-temperature working medium circuit 36, a heater H is arranged in the mixer MIX, and the mixer MIX provides low-temperature working media under different working conditions through working media in different temperature zones and the heater H;
the working medium regulating valves of different temperature zones comprise a regulating valve V1 of the 300K temperature zone circuit 14, a regulating valve V2 of the 80K temperature zone circuit 27, a regulating valve V3 of the 30K temperature zone circuit 28, a regulating valve V4 of the 30K temperature zone circuit 25, a regulating valve V5 of the low-temperature working medium supply circuit 35 and a regulating valve V6 of the low-temperature working medium return circuit 34.
The hydrogen source 3 to be tested is provided with a high-purity hydrogen supply circuit 41 and a hydrogen return circuit 47, and is respectively connected to a normal-temperature hydrogen supply circuit 42 and a hydrogen return circuit 46 of the parahydrogen catalytic conversion system 4 through a flanged gas supply valve FV3 and a gas return valve FV 4.
The system 4 for catalytic conversion of the ortho-para hydrogen is provided with a precooling heat exchanger HX3, an ortho-para hydrogen catalytic converter O-P, and ortho-para hydrogen catalytic conversion working condition regulating valves V8 and V9;
an inlet and an outlet of a heat flow path of the precooling heat exchanger HX3 are respectively connected to the normal-temperature hydrogen supply path 42 and the low-temperature hydrogen path 43, an inlet and an outlet of a cold flow path of the precooling heat exchanger HX3 are respectively connected to the low-temperature hydrogen gas return path 45 and the hydrogen gas return path 46, and the precooling heat exchanger HX3 realizes the function of cooling the hydrogen to be tested to the test temperature;
the positive and secondary hydrogen catalytic converter O-P is respectively connected to a low-temperature working medium supply circuit 35 and a low-temperature working medium gas return circuit 34 through flanges FL1 and FL2, and is respectively connected to a low-temperature hydrogen gas circuit 44 and a low-temperature hydrogen gas return circuit 45 through flanges FL3 and FL4, the positive and secondary hydrogen catalytic converter O-P is provided with a hydrogen filtering layer, a catalyst filling port and an evacuation port, and the positive and secondary hydrogen catalytic converter O-P realizes a positive and secondary hydrogen conversion function;
the normal-secondary hydrogen catalytic conversion working condition regulating valve V8 is connected with the low-temperature hydrogen gas circuit 43 and the low-temperature hydrogen gas circuit 44, the normal-secondary hydrogen catalytic conversion working condition regulating valve V9 is connected with the low-temperature hydrogen gas circuit 44 and the hydrogen gas return circuit 45, and the normal-secondary hydrogen catalytic conversion working condition regulating valves V8 and V9 realize the regulating function of the pressure and the flow of the hydrogen to be measured.
The measurement control system is provided with a temperature measurement T1, a pressure measurement P1 and a flow measurement F1 of the low-temperature working medium supply circuit 35, and is provided with a temperature measurement T2 and a pressure measurement P2 of the low-temperature working medium gas return circuit 34;
the measurement control system is provided with a temperature measurement T3, a pressure measurement P3, a flow measurement F3 and a component measurement A3 of a low-temperature hydrogen gas circuit 44, temperature measurements T4-T6 and component measurements A4-A6 of different positions in the normal-secondary hydrogen converter, a temperature measurement T7 and a component measurement A7 of a hydrogen gas return circuit 45, and a differential pressure measurement dP of the normal-secondary hydrogen catalytic converter O-P;
the working process of the system is as follows:
after system preconditioning, compressor C is first started and high pressure PH and low pressure PL are controlled by compressor C and bypass valve V0. After the working medium compressor system 1 stably operates, valves FV2, V6, V5 and FV1 are slowly opened, and the temperature of the refrigeration cycle system 2 is reduced to a temperature range of 80K according to a set speed by adjusting a valve V2 and a liquid nitrogen valve V7. The testing condition of any temperature in the temperature range of 300K-80K can be provided at the stage by adjusting valves V1 and V2. To obtain a lower test temperature, the regulating valve V4 is gradually opened and the expansion machine T is started to realize the temperature reduction of the system to a 20K temperature zone. The test condition of any temperature in an 80K-20K temperature zone can be provided for the system at the stage by adjusting valves V2, V3 and V4. The valves FV4 and FV3 were opened slowly to initiate the positive secondary hydrogen catalytic conversion performance test, the pressure and flow rate of positive secondary hydrogen catalytic conversion were controlled by adjusting valves V8 and V9, and the temperature of positive secondary hydrogen catalytic conversion was controlled by adjusting valves V5 and V6. According to experimental requirements, the temperature, pressure and flow of the catalytic conversion of the para-hydrogen are adjusted, and dynamic performance tests of the catalytic conversion of the para-hydrogen under different working conditions and in the conversion process can be carried out.
In conclusion, the embodiment of the invention can flexibly adjust the temperature, the pressure and the flow of the low-temperature working medium and the hydrogen to be tested, can meet the requirement of the all-condition test of the catalytic conversion process of the para-hydrogen, and is suitable for testing and analyzing the dynamic performance of the catalytic conversion of the para-hydrogen in the large-scale hydrogen liquefaction process.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A system for testing the dynamic performance of catalytic conversion of para-hydrogen is characterized by comprising a working medium compression system, a refrigeration cycle system, a hydrogen source to be tested, an ortho-para-hydrogen catalytic conversion system and a measurement control system;
the working medium compression system is used for compressing a low-pressure working medium to a high-pressure working medium and obtaining a high-pressure normal-temperature working medium in a 300-temperature area through cooling;
the refrigeration cycle system is used for sequentially cooling the high-pressure working medium output by the working medium compression system to an 80K temperature zone, a 30K temperature zone and a 20K temperature zone; mixing working media in the 300K temperature region output from the working medium compression system in the 80K temperature region, the 30K temperature region and the 20K temperature region according to requirements to obtain low-temperature working media in required working conditions, and then sending the low-temperature working media into the para-hydrogen catalytic conversion system;
the system comprises a refrigeration cycle system, an orthoparahydrogen catalytic conversion system, a hydrogen source to be detected and an orthohydrogen catalytic conversion system, wherein the orthohydrogen catalytic conversion system is used for performing orthohydrogen catalytic conversion on hydrogen provided by the hydrogen source to be detected under the low-temperature working condition provided by the refrigeration cycle system;
the measurement control system is used for testing the conversion performance of the parahydrogen catalytic conversion system.
2. The system for testing dynamic performance of catalytic conversion of para-hydrogen according to claim 1, wherein said refrigeration cycle system comprises precooling heat exchanger HX1, pre-stage heat exchanger HX2, working medium mixer MIX and heater H thereof; the precooling heat exchanger HX1 is used for cooling the high-pressure working medium in the 300K temperature zone output by the working medium compression system to the working medium in the 80K temperature zone; the front-stage heat exchanger HX2 is used for cooling a working medium in an 80K temperature zone to a working medium in a 30K temperature zone; the expansion machine T is used for performing expansion refrigeration on the working medium in the 30K temperature zone to obtain the working medium in the 20K temperature zone; the working medium mixer MIX collects working media in an 80K temperature zone, a 30K temperature zone and a 20K temperature zone and a 300K temperature zone high-pressure working medium output by the working medium compression system, and obtains the working medium under the required working condition with the aid of a heater H.
3. The system for testing dynamic performance of catalytic conversion of para-hydrogen as claimed in claim 2, further comprising an adsorber for removing impurity gases from output working fluid of pre-cooling heat exchanger HX 1.
4. The system for testing dynamic performance of catalytic conversion of para-hydrogen as claimed in claim 1, wherein said system for catalytic conversion of para-hydrogen comprises precooling heat exchanger HX3 and catalytic converter O-P of para-hydrogen;
the precooling heat exchanger HX3 is used for cooling hydrogen provided by a hydrogen source to be tested to a test temperature;
the O-P receives the low-temperature working medium output by the refrigeration cycle system, and realizes the function of converting the para-hydrogen.
5. The system for testing dynamic performance of catalytic conversion of para-hydrogen as claimed in claim 4, wherein said catalytic converter O-P is provided with a hydrogen filter layer, a catalyst filling port and an evacuation port.
6. The system for testing dynamic performance of an ortho-para-hydrogen catalytic conversion as recited in claim 1, wherein said measurement control system is configured to:
measuring the temperature, pressure and flow of the low-temperature working medium output by the refrigeration cycle system;
testing the temperature and pressure of the low-temperature working medium circulated back by the para-hydrogen catalytic conversion system;
testing the temperature, pressure, flow rate and composition of the hydrogen delivered to the para-hydrogen catalytic conversion system;
testing different positions in the conversion process of the para-hydrogen catalytic conversion system and the temperature and the components of the output converted gas;
and testing the pressure differential of the para-hydrogen catalytic conversion system.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113606494A (en) * | 2021-07-29 | 2021-11-05 | 中国科学院合肥物质科学研究院 | Device for producing orthohydrogen and parahydrogen with different components |
| 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 |
| CN114087845A (en) * | 2021-11-19 | 2022-02-25 | 北京大臻科技有限公司 | Liquid hydrogen production device, system and method based on parahydrogen circulation |
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