CN217230245U - Ammonia decomposition hydrogen production system - Google Patents
Ammonia decomposition hydrogen production system Download PDFInfo
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- CN217230245U CN217230245U CN202220577931.8U CN202220577931U CN217230245U CN 217230245 U CN217230245 U CN 217230245U CN 202220577931 U CN202220577931 U CN 202220577931U CN 217230245 U CN217230245 U CN 217230245U
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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
- 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
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
Abstract
The utility model discloses an ammonia decomposition hydrogen production system, which comprises an ammonia decomposition device, a heat exchange device, an ammonia gas absorption device, a hydrogen purification device and a hydrogen storage device; the ammonia decomposition device comprises a decomposition cavity, an ammonia decomposition reaction catalyst is filled in the decomposition cavity, a catalytic combustion pipeline is also arranged in the decomposition cavity, and the decomposition cavity is connected with a liquid ammonia conveying pipeline; the heat exchange device comprises a first heat exchanger and a second heat exchanger, and tube passes of the first heat exchanger and the second heat exchanger are connected in series on the liquid ammonia conveying pipeline; the outlet of the decomposition cavity is connected with an ammonia absorption device through a decomposed gas conveying pipeline, and the shell pass of the first heat exchanger is connected in series on the decomposed gas conveying pipeline; the outlet of the catalytic combustion pipeline is connected with a combustion gas discharge pipeline, and the shell pass of the second heat exchanger is connected in series on the combustion gas discharge pipeline. The utility model discloses the heat exchanger is in order to preheat the liquid ammonia raw materials step by step for the whole energy utilization rate that has of system is high, simple advantage such as high-efficient.
Description
Technical Field
The utility model relates to a hydrogen manufacturing technical field, specifically speaking relate to an ammonia decomposition hydrogen manufacturing system.
Background
Ammonia is one of the most productive inorganic compounds in the world and has wide application. Ammonia is an important raw material for manufacturing nitric acid, fertilizers and explosives, is very important for organisms on earth, is an important component of a plurality of foods and fertilizers, and is also a direct or indirect component of all medicines. In addition, the liquid ammonia is an excellent hydrogen storage carrier, is easy to transport, and the raw material ammonia is easy to obtain and low in price. The chemical equation for ammonia decomposition is as follows: 2NH 3 ＝3H 2 +N 2 Under standard conditions, 1 mole of ammonia decomposes completely absorbing 11040 kcal of heat. Due to the large heat absorption capacity of the liquid ammonia cracking reaction, the liquid ammonia needs to be heated to 800-850 ℃ in an ammonia decomposition furnace, and is catalytically decomposed under the action of a nickel-based catalyst, so that the process requirement is high. In the prior art, an independent combustion module is generally arranged to provide heat or an electric heating device is matched to provide heat, so that the energy consumption is high, the cost is high, and the problems of insufficient energy utilization, heat loss, low conversion rate and the like of many conventional ammonia decomposition hydrogen production systems exist.
SUMMERY OF THE UTILITY MODEL
Based on the technical problem, the utility model provides an ammonia decomposition hydrogen manufacturing system, this system have energy utilization rate height, simple advantage such as high-efficient.
The utility model discloses the technical solution who adopts is:
a system for preparing hydrogen by decomposing ammonia comprises an ammonia decomposing device, a heat exchange device, an ammonia gas absorption device, a hydrogen purification device and a hydrogen storage device;
the ammonia decomposition device comprises a decomposition cavity, an ammonia decomposition reaction catalyst is filled in the decomposition cavity, a catalytic combustion pipeline is also arranged in the decomposition cavity, and a hydrogen combustion reaction catalyst is coated on the inner wall of the catalytic combustion pipeline;
an inlet of the decomposition cavity is connected with a liquid ammonia conveying pipeline, the heat exchange device comprises a first heat exchanger and a second heat exchanger, tube passes of the first heat exchanger and the second heat exchanger are connected in series on the liquid ammonia conveying pipeline, and the second heat exchanger is arranged between the first heat exchanger and the ammonia decomposition device; the inlet of the catalytic combustion pipeline is connected with a combustion gas conveying pipeline;
the outlet of the decomposition cavity is connected with an ammonia absorption device through a decomposed gas conveying pipeline, and the shell pass of the first heat exchanger is connected in series on the decomposed gas conveying pipeline; the outlet of the catalytic combustion pipeline is connected with a combustion gas discharge pipeline, and the shell pass of the second heat exchanger is connected in series on the combustion gas discharge pipeline;
the gas outlet of the ammonia gas absorption device is connected with the hydrogen purification device through a gas discharge pipeline, and the hydrogen outlet of the hydrogen purification device is connected with the hydrogen storage device through a hydrogen output pipeline; the liquid outlet of the ammonia gas absorption device is connected with a liquid discharge pipeline.
Preferably, the decomposition cavity of the ammonia decomposition device is coated with a heat insulation layer, and the heat insulation layer is made of silicate fiber materials.
Preferably, the catalytic combustion conduit is helical.
Preferably, the catalytic combustion pipeline is vertically arranged in the decomposition cavity, the bottom end of the catalytic combustion pipeline is an inlet, and the top end of the catalytic combustion pipeline is an outlet; the catalytic combustion pipeline is provided with a plurality of catalytic combustion pipelines which are arranged at intervals in the decomposition cavity.
Preferably, a buffer tank is arranged on the decomposed gas conveying pipeline, and the buffer tank is arranged between the first heat exchanger and the ammonia decomposition device.
Preferably, the hydrogen purification device is internally provided with a membrane separator which only allows hydrogen to pass through in a single direction, one side of the membrane separator is a hydrogen chamber, the other side of the membrane separator is a nitrogen chamber, and the nitrogen chamber is connected with a nitrogen storage device.
Preferably, the combustion gas conveying pipeline is connected with a gas mixer, an inlet at one end of the gas mixer is connected with an air input pipeline, a fan is arranged on the air input pipeline, and an inlet at the other end of the gas mixer is connected with a hydrogen input pipeline.
Preferably, the hydrogen input pipeline is connected with a hydrogen output pipeline or a hydrogen storage device.
Preferably, the air input pipeline is further provided with a gas collection chamber, the gas collection chamber is located between the fan and the gas mixer, and the gas collection chamber is further connected with the combustor discharge pipeline.
The utility model has the beneficial technical effects that:
(1) the utility model discloses decompose the high-temperature gas that produces and catalytic combustion pipeline exhaust combustion gas through first heat exchanger and second heat exchanger respectively in order preheating the liquid ammonia raw materials step by step to can be to the heat rational utilization that the system produced, make the whole energy utilization rate that has of system high, simple advantage such as high-efficient.
(2) The utility model discloses a purification hydrogen that hydrogen purification device obtained, one of them part is as catalytic oxidation combustion reaction's raw material gas in the catalytic combustion pipeline, and catalytic oxidation combustion reaction is exothermic provides the heat for ammonia decomposition reaction, has simplified system technology, reduce cost.
(3) The utility model discloses catalytic combustion pipeline entry in ammonia decomposition device sets up in the bottom, and the export sets up in the top, and the pipeline is the heliciform, and the inside coating has the catalyst, can make hydrogen fully react, improves oxidation combustion reaction efficiency, and then improves the heat supply effect, promotes the ammonia decomposition.
(4) The utility model discloses ammonia decomposition device's decomposition cavity sets up the heat preservation outward, and the heat preservation material adopts the silicic acid fibre of low coefficient of heat transfer, can reduce the heat dissipation, reduces energy loss.
Drawings
The present invention will be further explained with reference to the following detailed description and accompanying drawings:
fig. 1 is a schematic view of the structural principle of the present invention.
Detailed Description
With the attached drawing, the system for preparing hydrogen by decomposing ammonia comprises an ammonia decomposing device 1, a heat exchange device, an ammonia gas absorbing device 2, a hydrogen purifying device 3 and a hydrogen storage device 4. The ammonia decomposition device 1 comprises a decomposition cavity 101, an ammonia decomposition reaction catalyst is filled in the decomposition cavity 101, a catalytic combustion pipeline 102 is further arranged in the decomposition cavity, and a hydrogen combustion reaction catalyst is coated on the inner wall of the catalytic combustion pipeline 102. An inlet of the decomposition cavity 101 is connected with a liquid ammonia delivery pipeline 5, and the liquid ammonia delivery pipeline 5 is connected with a liquid ammonia storage tank 21. The heat exchange device comprises a first heat exchanger 6 and a second heat exchanger 7, and the first heat exchanger 6 and the second heat exchanger 7 can adopt a double-pipe structure. The tube passes of the first heat exchanger 6 and the second heat exchanger 7 are connected in series on the liquid ammonia conveying pipeline 5, and the second heat exchanger 7 is arranged between the first heat exchanger 6 and the ammonia decomposition device 1. The inlet of the catalytic combustion conduit 102 is connected to the combustion gas delivery conduit 8. The outlet of the decomposition cavity is connected with the ammonia absorption device 2 through a decomposed gas conveying pipeline 9, and the shell pass of the first heat exchanger 6 is connected in series on the decomposed gas conveying pipeline 9. The outlet of the catalytic combustion pipe 102 is connected to the combustion gas exhaust pipe 10, and the shell side of the second heat exchanger 7 is connected in series to the combustion gas exhaust pipe 10. The gas outlet of the ammonia gas absorption device 2 is connected with the hydrogen purification device 3 through a gas discharge pipeline 12, and the hydrogen outlet of the hydrogen purification device 3 is connected with the hydrogen storage device 4 through a hydrogen output pipeline 20. The liquid outlet of the ammonia gas absorption device 2 is connected with a liquid discharge pipeline 11.
The outlet of the decomposition cavity of the ammonia decomposition device is connected with the first heat exchanger and can perform primary heat exchange with liquid ammonia; the outlet of the catalytic combustion pipeline of the ammonia decomposition device is connected with the second heat exchanger, and the temperature of the residual air or oxygen after combustion reaction is higher, so that the liquid ammonia raw material can be further preheated.
A buffer tank 13 is further provided on the decomposed gas transporting pipe 9, and the buffer tank 13 is provided between the first heat exchanger 6 and the ammonia decomposition device 1. The buffer tank 13 contains mixed gas H 2 、N 2 And a small amount of NH 3 。
The ammonia gas absorption device can adopt a conventional structure form such as a spray absorption tower and the like so as to change a small amount of ammonia gas flowing out of the buffer tank into ammonia water, the obtained ammonia water is discharged through the liquid discharge pipeline 11, and mixed gas except the ammonia gas is sent to the hydrogen purification device 3 through the gas discharge pipeline 12.
The hydrogen purification device 3 is internally provided with a membrane separator which only allows hydrogen to pass through in one direction so as to separate hydrogen and nitrogen, one side of the membrane separator is a hydrogen chamber, the other side of the membrane separator is a nitrogen chamber, and the nitrogen chamber is connected with a nitrogen storage device 14. Most of the nitrogen in the nitrogen chamber may be sent along with a small amount of hydrogen to the nitrogen storage device 14 for storage and further use.
The combustion gas conveying pipeline 8 is connected with a gas mixer 15, an inlet at one end of the gas mixer 15 is connected with an air input pipeline 16, a fan 17 is arranged on the air input pipeline, and an inlet at the other end of the gas mixer 15 is connected with a hydrogen input pipeline 18. The hydrogen input pipeline 18 is connected with a hydrogen output pipeline or a hydrogen storage device. The air input pipeline is also provided with a gas collection cavity 19, the gas collection cavity 19 is positioned between the fan 17 and the gas mixer 15, and the gas collection cavity is also connected with the combustor discharge pipeline 10. The air required by the catalytic combustion reaction can be preheated by the residual heat of the combustion gas discharged from the catalytic combustion pipeline after heat exchange through the gas collection chamber 19.
As right the utility model discloses a further design, the decomposition cavity 101 outside cladding at ammonia decomposition device has heat preservation 103, and heat preservation 103 adopts silicate fiber material processing to make, and its coefficient of heat transfer is low, reducible energy loss.
Further, the catalytic combustion conduit 102 is helical. The catalytic combustion conduit 102 is vertically arranged in the decomposition chamber, with the bottom end of the catalytic combustion conduit being an inlet and the top end being an outlet. The catalytic combustion pipes 102 are disposed in a plurality and arranged at intervals in the decomposition chamber. The oxidation combustion reaction of hydrogen and air takes place in ammonia decomposition device's the catalytic combustion pipeline, and the heat of reaction preheats for ammonia decomposition device's cavity, and the catalytic combustion pipeline is the heliciform, and the inner wall coating has hydrogen combustion reaction catalyst, can improve and preheat efficiency. And, ammonia decomposition device's catalytic combustion pipeline export is located the top, and the entry is located the bottom, and the air current from the bottom up spiral rises, and gaseous full combustion improves the heat supply effect, promotes the ammonia decomposition.
The decomposition chamber 101 may be made of high temperature heat-resistant alloy material, so as to ensure a long service life in high temperature and strong corrosive environment.
The ammonia decomposition reaction catalyst may be one selected from bimetallic catalysts such as Fe-Ni and Fe-Mo, carbide catalysts such as FeCx and MoCx, and nitride catalysts such as FeNx and MoNx. The hydrogen combustion reaction catalyst can be MgAl 2 O 4 、Pd-Fe-Ni/γ-Al 2 O 3 Cordierite, Pt/gamma-Al 2 O 3 Cordierite, etc.
The working process of the utility model roughly comprises the following steps:
(1) liquid ammonia is transported through liquid ammonia pipeline 5, and after the heat transfer of first heat exchanger 6, second heat exchanger 7 heaies up, carries to ammonia decomposition device 1. The ammonia decomposition reaction takes place in the ammonia decomposition device 1 to generate H 2 、N 2 And a small amount of unreacted ammonia. A spiral hydrogen catalytic combustion pipeline is arranged in the ammonia decomposition device 1, and hydrogen oxidation combustion reaction is carried out in the catalytic combustion pipeline to provide heat for the ammonia decomposition reaction.
(2) Gas generated by the ammonia decomposition device 1 firstly enters a buffer tank, then passes through a first heat exchanger 6 to preheat liquid ammonia, then enters an ammonia gas absorption device 2 to capture ammonia gas, and then is divided into two transportation branches, liquid is discharged through a liquid discharge pipeline 11, and the gas is conveyed to a hydrogen purification device 3. Part of the purified hydrogen enters the hydrogen storage device 4, and the other part of the purified hydrogen enters the gas mixer 15 to be used as raw material gas for catalytic combustion reaction.
(3) Unreacted gas in the catalytic combustion pipe 102 flows out from the top outlet, enters the second heat exchanger 7 to further preheat liquid ammonia, and then enters the gas collection chamber 19 to continue heat exchange with the outside air.
(4) Air and a part of purified hydrogen in the gas collecting chamber 19 are respectively sent into the gas mixer 15 through pipelines, and are mixed and then enter the pipelines from the inlet at the bottom of the catalytic combustion pipeline to generate oxidation combustion reaction, so that the self-sufficiency of heat is realized.
Parts not described in the above modes can be realized by adopting or referring to the prior art.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. An ammonia decomposition hydrogen production system is characterized in that: comprises an ammonia decomposition device, a heat exchange device, an ammonia gas absorption device, a hydrogen purification device and a hydrogen storage device;
the ammonia decomposition device comprises a decomposition cavity, an ammonia decomposition reaction catalyst is filled in the decomposition cavity, a catalytic combustion pipeline is also arranged in the decomposition cavity, and a hydrogen combustion reaction catalyst is coated on the inner wall of the catalytic combustion pipeline;
an inlet of the decomposition cavity is connected with a liquid ammonia conveying pipeline, the heat exchange device comprises a first heat exchanger and a second heat exchanger, tube passes of the first heat exchanger and the second heat exchanger are connected on the liquid ammonia conveying pipeline in series, and the second heat exchanger is arranged between the first heat exchanger and the ammonia decomposition device; the inlet of the catalytic combustion pipeline is connected with a combustion gas conveying pipeline;
the outlet of the decomposition cavity is connected with an ammonia absorption device through a decomposed gas conveying pipeline, and the shell pass of the first heat exchanger is connected in series on the decomposed gas conveying pipeline; the outlet of the catalytic combustion pipeline is connected with a combustion gas discharge pipeline, and the shell pass of the second heat exchanger is connected in series on the combustion gas discharge pipeline;
the gas outlet of the ammonia gas absorption device is connected with the hydrogen purification device through a gas discharge pipeline, and the hydrogen outlet of the hydrogen purification device is connected with the hydrogen storage device through a hydrogen output pipeline; the liquid outlet of the ammonia gas absorption device is connected with a liquid discharge pipeline.
2. The system for producing hydrogen by decomposing ammonia according to claim 1, characterized in that: the outside of the decomposition cavity of the ammonia decomposition device is coated with a heat-insulating layer which is made of silicate fiber materials.
3. The system for producing hydrogen by decomposing ammonia according to claim 1, characterized in that: the catalytic combustion conduit is helical.
4. The system for producing hydrogen by decomposing ammonia according to claim 1, characterized in that: the catalytic combustion pipeline is vertically arranged in the decomposition cavity, the bottom end of the catalytic combustion pipeline is an inlet, and the top end of the catalytic combustion pipeline is an outlet; the catalytic combustion pipeline is provided with a plurality of catalytic combustion pipelines which are arranged at intervals in the decomposition cavity.
5. The system for producing hydrogen by decomposing ammonia according to claim 1, characterized in that: the decomposed gas conveying pipeline is provided with a buffer tank, and the buffer tank is arranged between the first heat exchanger and the ammonia decomposition device.
6. The system for producing hydrogen by decomposing ammonia according to claim 1, characterized in that: the hydrogen purification device is characterized in that a membrane separator allowing hydrogen to pass through in one direction is arranged in the hydrogen purification device, a hydrogen chamber is arranged on one side of the membrane separator, a nitrogen chamber is arranged on the other side of the membrane separator, and the nitrogen chamber is connected with a nitrogen storage device.
7. The system for producing hydrogen by decomposing ammonia according to claim 1, characterized in that: the combustion gas conveying pipeline is connected with the gas mixer, an inlet at one end of the gas mixer is connected with the air input pipeline, the air input pipeline is provided with a fan, and an inlet at the other end of the gas mixer is connected with the hydrogen input pipeline.
8. The system for producing hydrogen by decomposing ammonia according to claim 7, characterized in that: the hydrogen input pipeline is connected with a hydrogen output pipeline or a hydrogen storage device.
9. The system for producing hydrogen by decomposing ammonia according to claim 7, characterized in that: the air input pipeline is also provided with a gas collection cavity, the gas collection cavity is positioned between the fan and the gas mixer, and the gas collection cavity is also connected with the discharge pipeline of the combustor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220577931.8U CN217230245U (en) | 2022-03-16 | 2022-03-16 | Ammonia decomposition hydrogen production system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220577931.8U CN217230245U (en) | 2022-03-16 | 2022-03-16 | Ammonia decomposition hydrogen production system |
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| CN217230245U true CN217230245U (en) | 2022-08-19 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116443813A (en) * | 2023-02-27 | 2023-07-18 | 福州大学 | Ammonia decomposition reaction device and system |
| CN117383511A (en) * | 2023-12-08 | 2024-01-12 | 上海亿维工业科技股份有限公司 | Compact ammonia decomposition reaction device and ammonia decomposition hydrogen production system |
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2022
- 2022-03-16 CN CN202220577931.8U patent/CN217230245U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116443813A (en) * | 2023-02-27 | 2023-07-18 | 福州大学 | Ammonia decomposition reaction device and system |
| CN117383511A (en) * | 2023-12-08 | 2024-01-12 | 上海亿维工业科技股份有限公司 | Compact ammonia decomposition reaction device and ammonia decomposition hydrogen production system |
| CN117383511B (en) * | 2023-12-08 | 2024-02-27 | 上海亿维工业科技股份有限公司 | Compact ammonia decomposition reaction device and ammonia decomposition hydrogen production system |
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