CN220393320U - Waste heat recovery natural gas hydrogen production steam conversion system - Google Patents
Waste heat recovery natural gas hydrogen production steam conversion system Download PDFInfo
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- CN220393320U CN220393320U CN202321895861.1U CN202321895861U CN220393320U CN 220393320 U CN220393320 U CN 220393320U CN 202321895861 U CN202321895861 U CN 202321895861U CN 220393320 U CN220393320 U CN 220393320U
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- steam
- natural gas
- conversion
- heat recovery
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 134
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 92
- 239000003345 natural gas Substances 0.000 title claims abstract description 66
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 61
- 239000001257 hydrogen Substances 0.000 title claims abstract description 61
- 238000011084 recovery Methods 0.000 title claims abstract description 41
- 239000002918 waste heat Substances 0.000 title claims abstract description 40
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 239000007789 gas Substances 0.000 claims abstract description 58
- 238000001179 sorption measurement Methods 0.000 claims abstract description 27
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 23
- 230000023556 desulfurization Effects 0.000 claims abstract description 23
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 27
- 239000003546 flue gas Substances 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000002485 combustion reaction Methods 0.000 claims description 7
- 230000005855 radiation Effects 0.000 claims description 7
- 230000009466 transformation Effects 0.000 claims description 7
- 238000003795 desorption Methods 0.000 claims description 6
- 238000000629 steam reforming Methods 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 2
- 238000002407 reforming Methods 0.000 claims 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 10
- 239000003054 catalyst Substances 0.000 description 8
- 230000000087 stabilizing effect Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 description 5
- 239000001569 carbon dioxide Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 229910002091 carbon monoxide Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 230000003009 desulfurizing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- WHDPTDWLEKQKKX-UHFFFAOYSA-N cobalt molybdenum Chemical compound [Co].[Co].[Mo] WHDPTDWLEKQKKX-UHFFFAOYSA-N 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 125000001741 organic sulfur group Chemical group 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Classifications
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Landscapes
- Separation Of Gases By Adsorption (AREA)
Abstract
The utility model discloses a waste heat recovery natural gas hydrogen production steam conversion system, belongs to the technical field of natural gas hydrogen production, and solves the technical problems that in the prior art, the fluctuation of a gas source is large, and the waste heat recovery system is lacked, so that the conversion efficiency and the conversion cost are influenced. The device comprises a natural gas supply unit, a desulfurization unit connected with the natural gas supply unit, a conversion unit connected with the desulfurization unit, a waste heat recovery unit and a gas conversion unit which are respectively connected with the conversion unit, and a common hydrogen adsorption unit connected with the gas conversion unit, wherein a steam generation unit is further arranged between the conversion unit and the desulfurization unit. The waste heat recovery natural gas hydrogen production steam conversion system can be better used for natural gas hydrogen production work, is convenient to maintain and has controllable cost.
Description
Technical Field
The utility model relates to the technical field of natural gas hydrogen production, in particular to a waste heat recovery natural gas hydrogen production steam conversion system.
Background
The principle of natural gas hydrogen production is that natural gas is pretreated, methane and steam are converted into carbon monoxide, hydrogen and the like in a conversion device under the condition of a catalyst, and then carbon monoxide is converted into carbon dioxide and hydrogen in the conversion device, and finally hydrogen is obtained.
Patent publication number CN206646080U discloses a natural gas reformer, including burning furnace, rotary-cut section of thick bamboo, first heat accumulation stove, vapor nozzle, reformer, catalyst bed and adjusting screw, the guide rail is all fixed to be inlayed on the inner wall of reformer, and the guide rail is located the sliding tray inboard, upper and lower regulating plate fixed connection is in one side of catalyst bed, catalyst mouth and gas outlet all establish in the lower extreme outside of reformer, motor fixed mounting is in the bottom of reformer, catalyst strip hole is established in one side of catalyst bed. The conversion from natural gas to hydrogen is realized by the principle, but in the conversion process, the conversion efficiency and the conversion cost are affected due to the lack of a waste heat recovery and gas source stabilizing system, so that a natural gas hydrogen production steam conversion system capable of keeping the pressure of a gas source stable and realizing the recovery of waste heat of flue gas is needed.
Disclosure of Invention
The utility model aims to provide a waste heat recovery natural gas hydrogen production steam conversion system, which aims to solve the technical problems that in the prior art, the fluctuation of a gas source is large, and the waste heat recovery system is lacked, so that the conversion efficiency and the conversion cost are influenced.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
the utility model provides a waste heat recovery natural gas hydrogen production steam conversion system, which comprises a natural gas supply unit, a desulfurization unit connected with the natural gas supply unit, a conversion unit connected with the desulfurization unit, a waste heat recovery unit and a gas conversion unit which are respectively connected with the conversion unit, and a common hydrogen adsorption unit connected with the gas conversion unit, wherein a steam generation unit is arranged between the conversion unit and the desulfurization unit;
the waste heat recovery unit comprises a flue gas pipeline communicated with the conversion unit, a heat exchange pipe is arranged in the flue gas pipeline, a steam cavity is formed between the flue gas pipeline and the heat exchange pipe, and the steam cavity is respectively connected with a water tank and a steam treatment unit.
The technical effect of adopting the technical scheme is as follows: the natural gas hydrogen production conversion process is realized by arranging a desulfurization unit, a steam generation unit, a conversion unit, a gas conversion unit and a common hydrogen adsorption unit; specifically, natural gas is subjected to desulfurization treatment by a desulfurization unit to obtain desulfurized gas; providing steam through a steam generating unit; the conversion unit is used for converting the desulfurization gas and the steam to obtain converted gas; the conversion gas is converted through a gas conversion unit to obtain converted gas; purifying the shift gas by a common hydrogen adsorption unit to obtain common hydrogen; the waste heat recovery unit is used for realizing the recovery work of waste heat in the conversion system, so that the waste of resources is avoided.
Alternatively or preferably, the conversion unit comprises a convection chamber, a radiation chamber and a waste heat recovery chamber which are communicated with each other; a mixed gas preheating coil is arranged in the convection chamber, and a conversion pipe and a heating combustion device are arranged in the radiation chamber;
the input end of the mixed gas preheating coil is communicated with the desulfurization unit and the steam generation unit, the output end of the mixed gas preheating coil is communicated with the input end of the conversion tube, and the output end of the conversion tube is communicated with the gas conversion unit.
Optionally or preferably, the output end of the common hydrogen adsorption unit is respectively communicated with a desorption gas buffer tank and a common hydrogen buffer tank, and the output end of the desorption gas buffer tank is connected with the heating combustion device.
Alternatively or preferably, the steam treatment unit comprises a steam buffer tank, a steam surge tank connected with the steam buffer tank and a steam turbine connected with the steam surge tank;
the output end of the steam turbine is connected with a transformation device, and the transformation device is connected with a useful electric appliance and a storage battery.
Alternatively or preferably, the heat exchange tube is connected with a flue gas treatment unit.
Optionally or preferably, the input end of the water tank is provided with a water inlet regulating valve; a steam control valve is arranged between the steam pressure stabilizing tank and the steam turbine, and a pressure relief valve is arranged on the steam turbine.
Alternatively or preferably, the common hydrogen adsorption unit comprises a plurality of pressure swing adsorption towers connected in parallel, and the output ends of the pressure swing adsorption towers are respectively communicated with the desorption gas buffer tank and the common hydrogen buffer tank.
The technical effect of adopting the technical scheme is as follows: the adsorption operation state can be optimized through the plurality of adsorption towers provided with the multistage natural gas buffer tanks and the common hydrogen adsorption units, so that the natural gas conversion process is uniform and continuous, the fluctuation of a gas source can be reduced, and the influence on the natural gas conversion efficiency is reduced.
Alternatively or preferably, the natural gas supply unit is connected with a first natural gas buffer tank and a second natural gas buffer tank respectively, and the first natural gas buffer tank and the second natural gas buffer tank are connected in series.
Based on the technical scheme, the utility model at least has the following technical effects:
according to the waste heat recovery natural gas hydrogen production steam conversion system provided by the utility model, the waste heat recovery unit and the steam treatment unit which are connected with the conversion unit are arranged, so that the residual flue gas with waste heat energy in the conversion unit can be utilized, and the resource waste is avoided;
the adsorption operation state can be optimized through the plurality of adsorption towers provided with the multistage natural gas buffer tanks and the common hydrogen adsorption units, so that the natural gas conversion process is uniform and continuous, the fluctuation of a gas source can be reduced, and the influence on the natural gas conversion efficiency is reduced.
Drawings
FIG. 1 is a schematic diagram of the composition of a heat recovery natural gas hydrogen production steam reforming system of the present utility model;
fig. 2 is a schematic structural diagram of a converting unit in the waste heat recovery natural gas hydrogen production steam converting system of the present utility model.
In the figure: 1. a first natural gas buffer tank; 2. a natural gas buffer tank II; 3. a conversion unit; 31. a mixed gas preheating coil; 32. a conversion tube; 33. a convection chamber; 34. a radiation chamber; 35. a waste heat recovery chamber; 4. analyzing the gas buffer tank; 5. a hydrogen buffer tank; 6. a hydrogen adsorption unit; 7. a heat exchange tube; 8. a desulfurization unit; 9. a steam generation unit; 10. a gas conversion unit; 11. a water tank; 12. a steam buffer tank; 13. a steam pressure stabilizing tank; 14. a steam turbine; 15. a voltage transformation device; 16. an electric appliance; 17. a flue gas duct; 18. and a flue gas treatment unit.
Detailed Description
The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model; it is apparent that the described embodiments are only some embodiments of the present utility model, not all of them, and all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present utility model without making any inventive effort are within the scope of the present utility model.
[ example ]
Referring to fig. 1, a hydrogen production steam conversion system by using waste heat recovery natural gas includes a natural gas supply unit, a desulfurization unit 8, a steam generation unit 9, a conversion unit 3, a waste heat recovery unit, a gas conversion unit 10, and a hydrogen absorption unit 6.
As can be appreciated by those skilled in the art, the above units are communicated through pipelines, and valve bodies with corresponding functions are arranged on each pipeline, and each unit has a corresponding input end and output end.
Specifically, the output end of the natural gas supply unit is communicated with the input end of a first natural gas buffer tank 1, the output end of the first natural gas buffer tank 1 is communicated with the input end of a second natural gas buffer tank 2, and the output end of the second natural gas buffer tank 2 is communicated with a desulfurization unit 8; the desulfurization unit 8 is mainly used for desulfurizing the natural gas from the natural gas supply unit to obtain desulfurized gas, and in actual work, organic sulfur in the natural gas is generally converted into inorganic sulfur by adopting cobalt-molybdenum hydrogenation serial zinc oxide of the natural gas as a desulfurizing agent and then removed.
The output end of the desulfurization unit 8 is connected with the conversion unit 3, a steam generation unit 9 is arranged between the desulfurization unit 8 and the conversion unit 3, the output end of the steam generation unit 9 is also connected with the conversion unit 3, and steam generated by the steam generation unit 9 is used for carrying out conversion treatment on the desulfurization gas in the conversion unit 3 and generating conversion gas.
Referring to fig. 2, in the present embodiment, the conversion unit 3 includes a convection chamber 33, a radiation chamber 34, and a waste heat recovery chamber 45 that are communicated with each other; wherein, a mixed gas preheating coil 31 is arranged in the convection chamber, and the input end of the mixed gas preheating coil 31 is communicated with the desulfurization unit 8 and the steam generation unit 9; a conversion pipe 32 and a heating combustion device are arranged in the radiation chamber 34, the output end of the mixed gas preheating coil 31 is communicated with the input end of the conversion pipe 32, and the output end of the conversion pipe 32 is communicated with the gas conversion unit 10; the waste heat recovery chamber 45 is in communication with the waste heat recovery unit via the flue gas duct 17.
With continued reference to fig. 1, the input end of the gas conversion unit 10 is connected to the output end of the conversion tube 32, and the gas conversion unit 10 is configured to convert the converted gas to obtain converted gas, and in actual operation, the reaction in the gas conversion unit 10 mainly converts carbon monoxide in the converted gas into carbon dioxide and hydrogen under the action of a catalyst, specifically, carbon monoxide and water react under the condition of 300-400 ℃ and under the condition of a ferric oxide catalyst to generate carbon dioxide and hydrogen.
The output end of the gas conversion unit 10 is communicated with a common hydrogen adsorption unit 6, in this embodiment, the common hydrogen adsorption unit 6 may be a plurality of pressure swing adsorption towers connected in parallel, the common hydrogen adsorption unit 6 is used for adsorbing impurities such as carbon dioxide in the conversion gas, the obtained common hydrogen enters into a common hydrogen buffer tank 5, the remaining tail gas enters into an analysis gas buffer tank 4, and the output end of the analysis gas buffer tank 4 is connected with a heating combustion device in the conversion unit 3, so that the heating combustion device can be used for heating in the conversion unit 3.
After the common hydrogen enters the common hydrogen buffer tank 5, the common hydrogen can be further purified or enter a collecting unit.
The waste heat recovery unit comprises a flue gas pipeline 17 communicated with the conversion unit 3, a heat exchange pipe 7 is arranged in the flue gas pipeline 17, the flue gas pipeline 17 is communicated with the heat exchange pipe 7, a flue gas treatment unit 18 is communicated with the lower part of the heat exchange pipe 7, and the flue gas subjected to heat exchange is discharged to the flue gas treatment unit 18; a steam cavity is formed between the flue gas pipeline 17 and the heat exchange tube 7, the upper part of the steam cavity is connected with the water tank 11, and the lower part of the steam cavity is connected with the steam treatment unit.
In this embodiment, the steam processing unit includes a steam buffer tank, a steam pressure stabilizing tank connected to the steam buffer tank, and a steam turbine connected to the steam pressure stabilizing tank; the output end of the steam turbine is connected with a transformation device, and the transformation device is connected with a useful electric appliance and a storage battery. The input end of the water tank is provided with a water inlet regulating valve; a steam control valve is arranged between the steam pressure stabilizing tank and the steam turbine, and a pressure relief valve is arranged on the steam turbine.
In actual operation, high-temperature flue gas (mainly comprising carbon dioxide and water) enters the heat exchange tube 7 through the flue gas pipeline 17, exchanges heat with water in the steam cavity, forms steam after the temperature of the water body rises and enters the steam buffer tank 12 and the steam pressure stabilizing tank 13, the steam in the steam pressure stabilizing tank 13 drives the steam turbine 14 to rotate, the steam turbine 14 can be connected with a rotor generator to generate electricity, and the electricity can be supplied to the electric appliance 16 or the storage battery after being processed by the pressure changing device 15.
According to the waste heat recovery natural gas hydrogen production steam conversion system provided by the utility model, the waste heat recovery unit and the steam treatment unit which are connected with the conversion unit are arranged, so that the residual flue gas with waste heat energy in the conversion unit can be utilized; the adsorption operation state can be optimized through the plurality of adsorption towers provided with the multistage natural gas buffer tanks and the common hydrogen adsorption units, so that the natural gas conversion process is uniform and continuous, and the fluctuation of a gas source can be reduced; in general, the method has the characteristics of simple flow, capability of realizing automatic control and high purity of the converted hydrogen.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The hydrogen production steam conversion system by using the natural gas through waste heat recovery is characterized by comprising a natural gas supply unit, a desulfurization unit (8) connected with the natural gas supply unit, a conversion unit (3) connected with the desulfurization unit (8), a waste heat recovery unit and a gas conversion unit (10) respectively connected with the conversion unit (3), and a common hydrogen adsorption unit (6) connected with the gas conversion unit (10), wherein a steam generation unit (9) is further arranged between the conversion unit (3) and the desulfurization unit (8);
the waste heat recovery unit comprises a flue gas pipeline (17) communicated with the conversion unit (3), a heat exchange pipe (7) is arranged in the flue gas pipeline (17), a steam cavity is formed between the flue gas pipeline (17) and the heat exchange pipe (7), and the steam cavity is respectively connected with a water tank (11) and a steam treatment unit.
2. The heat recovery natural gas hydrogen production steam reforming system according to claim 1, wherein the reforming unit (3) comprises a convection chamber (33), a radiation chamber (34) and a heat recovery chamber (35) in communication with each other; a mixed gas preheating coil pipe (31) is arranged in the convection chamber (33), and a conversion pipe (32) and a heating combustion device are arranged in the radiation chamber (34);
the input end of the mixed gas preheating coil pipe (31) is communicated with the desulfurization unit (8) and the steam generation unit (9), the output end of the mixed gas preheating coil pipe (31) is communicated with the input end of the conversion pipe (32), and the output end of the conversion pipe (32) is communicated with the gas conversion unit (10).
3. The waste heat recovery natural gas hydrogen production steam conversion system according to claim 2, wherein the output end of the common hydrogen adsorption unit (6) is respectively communicated with a desorption gas buffer tank (4) and a common hydrogen buffer tank (5), and the output end of the desorption gas buffer tank (4) is connected with the heating combustion device.
4. The waste heat recovery natural gas hydrogen production steam reforming system according to claim 1, wherein the steam treatment unit comprises a steam buffer tank (12), a steam surge tank (13) connected to the steam buffer tank (12), and a steam turbine (14) connected to the steam surge tank (13);
the output end of the steam turbine (14) is connected with a transformation device (15), and the transformation device (15) is connected with a power appliance (16) and a storage battery.
5. The waste heat recovery natural gas hydrogen production steam reforming system according to claim 4, wherein the heat exchange tube (7) is connected with a flue gas treatment unit (18).
6. The waste heat recovery natural gas hydrogen production steam reforming system according to claim 5, wherein the input end of the water tank (11) is provided with a water inlet regulating valve; a steam control valve is arranged between the steam surge tank (13) and the steam turbine (14), and a pressure relief valve is arranged on the steam turbine (14).
7. A waste heat recovery natural gas hydrogen production steam reforming system as defined in claim 3, wherein the hydrogen-producing adsorption unit (6) comprises a plurality of pressure swing adsorption towers connected in parallel, and the output ends of the pressure swing adsorption towers are respectively communicated with the desorption gas buffer tank (4) and the hydrogen-producing buffer tank (5).
8. The waste heat recovery natural gas hydrogen production steam conversion system according to claim 1, wherein the natural gas supply unit is respectively connected with a first natural gas buffer tank (1) and a second natural gas buffer tank (2), and the first natural gas buffer tank (1) and the second natural gas buffer tank (2) are connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321895861.1U CN220393320U (en) | 2023-07-18 | 2023-07-18 | Waste heat recovery natural gas hydrogen production steam conversion system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321895861.1U CN220393320U (en) | 2023-07-18 | 2023-07-18 | Waste heat recovery natural gas hydrogen production steam conversion system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220393320U true CN220393320U (en) | 2024-01-26 |
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ID=89613986
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321895861.1U Active CN220393320U (en) | 2023-07-18 | 2023-07-18 | Waste heat recovery natural gas hydrogen production steam conversion system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220393320U (en) |
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2023
- 2023-07-18 CN CN202321895861.1U patent/CN220393320U/en active Active
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