CN214456842U - System for LNG hydrogen production and liquid carbon dioxide - Google Patents
System for LNG hydrogen production and liquid carbon dioxide Download PDFInfo
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- CN214456842U CN214456842U CN202120500252.6U CN202120500252U CN214456842U CN 214456842 U CN214456842 U CN 214456842U CN 202120500252 U CN202120500252 U CN 202120500252U CN 214456842 U CN214456842 U CN 214456842U
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Abstract
The utility model discloses a system for LNG hydrogen manufacturing and liquid carbon dioxide. The LNG hydrogen production and liquid carbon dioxide system comprises an LNG storage tank, a natural gas steam reforming hydrogen production device, a pressure swing adsorption device and a carbon dioxide liquefaction device; the LNG storage tank is connected with the carbon dioxide liquefaction device, and an LNG low-pressure pump is arranged between the LNG storage tank and the carbon dioxide liquefaction device; the gas outlet of the carbon dioxide liquefying device is connected with the natural gas steam reforming hydrogen production device; the gas outlet of the natural gas steam reforming hydrogen production device is connected with the pressure swing adsorption device; the product gas outlet of the pressure swing adsorption device is connected with the hydrogen collecting device, the purge gas outlet is connected with the carbon dioxide liquefying device, and the liquid outlet of the carbon dioxide liquefying device is connected with the liquid carbon dioxide collecting device. The utility model provides a carbon dioxide emission problem of natural gas hydrogen manufacturing to the carbon dioxide that the reaction generated has solved carbon dioxide source problem for the raw materials, will turn waste into wealth, has realized that process system material utilization and energy utilization promote in step.
Description
Technical Field
The utility model relates to a system for LNG hydrogen manufacturing and liquid carbon dioxide belongs to natural gas hydrogen manufacturing technical field.
Background
Among all the energy sources known at present, hydrogen energy is the cleanest energy source, and the product in the use process of hydrogen is water, so that zero emission can be really realized, no pollution is caused, the hydrogen energy is regarded as one of the energy sources with the most application prospect, and the hydrogen energy is also regarded as the ultimate form of energy source use by some people.
The green, low-carbon and low-cost hydrogen production technology is the key for the development of the hydrogen energy industry. At present, the technology for producing hydrogen by using fossil energy of natural gas SMR (SMR) and coal gasification is mature, large in scale and low in cost, is a main source of hydrogen fuel at the initial development stage of the hydrogen energy and hydrogen fuel cell vehicle industry, and is beneficial to promoting the industrial development. The hydrogen production by natural gas is the main source of hydrogen at home and abroad at present, and particularly, the hydrogen production by natural gas is mainly developed as the main source of hydrogen energy in countries with abundant natural gas resources such as the United states. Then, the emission of carbon dioxide generated by the hydrogen production with natural gas is large, and a solution for carbon dioxide emission is urgently needed to find out when the hydrogen production with natural gas is developed on a large scale.
Liquid carbon dioxide and dry ice have a wide range of uses in the industrial and food and beverage industries. In the metal welding and casting industry, the quality of the workpiece can be obviously improved; in the beverage and food industry, the taste and flavor of the beverage can be greatly improved. It can also be used in tobacco industry for tobacco shred puffing, food fresh keeping and freezing, food adding, pharmacy, sugar industry, printing and dyeing, wine making, agriculture, forestry and gardening, supercritical extraction, scientific research, etc. Liquefied Natural Gas (LNG) contains valuable cold energy resources, and LNG gives off huge cold energy during the process of being gasified into gaseous natural gas. Therefore, there is a need for a system and method for simultaneously producing hydrogen and liquid carbon dioxide using LNG.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a LNG hydrogen manufacturing and liquid carbon dioxide system utilizes the LNG cold energy liquefied carbon dioxide when utilizing LNG to prepare hydrogen, specifically is, adopts LNG to obtain hydrogen and carbon dioxide through the natural gas reforming reaction after as the raw material gas gasification, then utilizes LNG's cold energy to liquefy carbon dioxide, and final continuous production obtains hydrogen and liquid carbon dioxide.
The LNG hydrogen production and liquid carbon dioxide system provided by the utility model comprises an LNG storage tank, a natural gas steam reforming hydrogen production device, a pressure swing adsorption device and a carbon dioxide liquefaction device;
the LNG storage tank is connected with a carbon dioxide liquefaction device, and an LNG low-pressure pump is arranged between the LNG storage tank and the carbon dioxide liquefaction device;
the gas outlet of the carbon dioxide liquefying device is connected with the natural gas steam reforming hydrogen production device;
the gas outlet of the natural gas steam reforming hydrogen production device is connected with the pressure swing adsorption device;
and a product gas outlet of the pressure swing adsorption device is connected with a hydrogen collecting device, a purge gas outlet is connected with the carbon dioxide liquefying device, and a liquid outlet of the carbon dioxide liquefying device is connected with a liquid carbon dioxide collecting device.
In the system, the natural gas steam reforming hydrogen production device comprises a natural gas preheater, a natural gas heater and a natural gas conversion hydrogen production device which are connected in sequence;
a water vapor inlet of the natural gas conversion hydrogen production device is connected with a steam generator;
a reformed gas outlet of the natural gas conversion hydrogen production device is connected with a carbon monoxide conversion device;
and a gas outlet of the carbon monoxide conversion device is connected with the pressure swing adsorption device.
In the system, a desulfurization device is arranged between the natural gas preheater and the natural gas heater;
and the inlet of the steam generator is sequentially connected with the desalted water heater and the oxygen removal device.
In the system, a reformed gas outlet of the natural gas conversion hydrogen production device is sequentially connected with the steam generator, the natural gas heater and the carbon monoxide conversion device;
and a gas outlet of the carbon monoxide conversion device is sequentially connected with the desalted water heater, the natural gas preheater, the cooling heat exchange device, the gas-liquid separation device I and the pressure swing adsorption device.
In the system, a drying device is arranged between the pressure swing adsorption device and the carbon dioxide liquefaction device to remove moisture in the pressure swing adsorption device.
In the system, a gas-liquid separator II is arranged between the drying device and the carbon dioxide liquefying device so as to further remove water in the drying device.
Utilize the utility model discloses when hydrogen and liquid carbon dioxide are prepared to the system, can go on according to following step:
s1, introducing LNG in the LNG storage tank into the carbon dioxide liquefying device for heat exchange to obtain gaseous natural gas;
s2, introducing the natural gas into the natural gas steam reforming hydrogen production device, and obtaining hydrogen and carbon dioxide through natural gas steam reforming and carbon monoxide conversion;
and S3, introducing the hydrogen and the carbon dioxide obtained in the step S2 into the pressure swing adsorption device, purifying and separating to obtain hydrogen, collecting the hydrogen by the hydrogen collecting device, introducing the generated purge gas into the carbon dioxide liquefying device, liquefying by using cold energy generated by LNG gasification in the step S1 to obtain liquid carbon dioxide, and collecting the liquid carbon dioxide by the liquid carbon dioxide collecting device.
In the above method, in step S1, the LNG is pressurized to 0.5MPa to 5.0MPa and then introduced into the carbon dioxide liquefaction apparatus;
after heat exchange, the temperature of the natural gas is-10 ℃ to 25 ℃.
In the method, in step S2, the natural gas is preheated to 200 to 250 ℃, desulfurized and heated to 380 to 480 ℃, and then the natural gas is steam reformed to obtain reformed gas;
and heating the reformed gas to 250-320 ℃, and then carrying out carbon monoxide conversion to obtain the hydrogen and the carbon dioxide.
The utility model discloses provide the system of utilizing cold energy liquefaction carbon dioxide when LNG hydrogen manufacturing for the first time, have following beneficial effect:
(1) the system of the utility model prepares hydrogen by taking LNG as raw material, simultaneously recovers carbon dioxide generated by reaction by LNG cold energy, continuously produces hydrogen and liquid carbon dioxide, and simultaneously solves the problem of carbon emission;
(2) the utility model is provided with the carbon dioxide liquefying device, and the LNG gasification cold energy is fully utilized to liquefy the carbon dioxide, thereby reducing the heat source required by the LNG gasification by the LNG gasifying device on one hand, and solving the cold source required by the carbon dioxide liquefaction on the other hand;
(3) the utility model discloses the carbon dioxide emission problem of natural gas hydrogen manufacturing has been solved to the system to the carbon dioxide that the reaction generated has solved carbon dioxide source problem for the raw materials, will turn waste into wealth, has realized that process system material utilization and energy utilization promote in step.
Drawings
Fig. 1 is a schematic structural diagram of the LNG hydrogen production and liquid carbon dioxide system of the present invention.
The respective symbols in the figure are as follows:
the system comprises an LNG storage tank 1, an LNG low-pressure pump 2, a carbon dioxide liquefaction device 3, a pressure swing adsorption device 4, a natural gas preheater 5, a desulfurization device 6, a natural gas heater 7, a natural gas reforming hydrogen production device 8, a steam generator 9, a carbon monoxide conversion device 10, a desalted water heater 11, a deoxygenation device 12, a cooling heat exchange device 13, a gas-liquid separation device I14, a drying device 15 and a gas-liquid separation device II 16.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to the following embodiments.
The utility model discloses LNG hydrogen manufacturing and liquid carbon dioxide system utilizes the LNG cold energy liquefied carbon dioxide when utilizing LNG to prepare hydrogen, specifically is, adopts LNG to obtain hydrogen and carbon dioxide through the natural gas reforming reaction after as the feed gas gasification, then utilizes the cold energy of LNG to liquefy carbon dioxide, and final continuous production obtains hydrogen and liquid carbon dioxide.
Based on the utility model discloses, can LNG be raw materials preparation hydrogen, utilize LNG's cold energy recovery reaction to produce carbon dioxide simultaneously, realize carbon dioxide emission reduction's purpose.
As shown in fig. 1, for the utility model provides a LNG hydrogen manufacturing and liquid carbon dioxide system's schematic structure diagram, including LNG storage tank 1, LNG low-pressure pump 2, carbon dioxide liquefaction device 3, natural gas steam reforming hydrogen manufacturing installation and pressure swing adsorption device 4. Wherein, LNG storage tank 1 and carbon dioxide liquefaction device 3 are connected respectively to the entry and the export of LNG low-pressure pump 2 to carry out the heat transfer with LNG pressure boost and input to carbon dioxide liquefaction device 3 and obtain gaseous natural gas. The natural gas steam reforming hydrogen production device comprises a natural gas preheater 5, a desulphurization device 6, a natural gas heater 7 and a natural gas conversion hydrogen production device 8 which are sequentially connected, a steam inlet of the natural gas conversion hydrogen production device 8 is connected with a steam generator 9, a reformed gas outlet of the natural gas conversion hydrogen production device 8 is sequentially connected with the steam generator 9 and a carbon monoxide conversion device 10, and an inlet of the steam generator 9 is sequentially connected with a desalted water heater 11 and a deoxidizing device 12. The gas outlet of the carbon monoxide conversion device 10 is sequentially connected with a desalted water heater 11, a natural gas preheater 5, a cooling heat exchange device 13, a gas-liquid separation device I14 and a pressure swing adsorption device 4. The product gas outlet of the pressure swing adsorption device 4 obtains purified and separated hydrogen, the purge gas outlet is sequentially connected with the drying device 15, the gas-liquid separation device II 16 and the carbon dioxide liquefaction device 3, and in the carbon dioxide liquefaction device 3, the purge gas is converted into liquid carbon dioxide by utilizing the pressurized LNG cold energy.
The working process of the LNG hydrogen production and liquid carbon dioxide system is as follows:
firstly, 100kgLNG is taken out from an LNG storage tank 1 by an LNG low-pressure pump 2 and pressurized to 1.2MPa, and the pressurized LNG exchanges heat with a carbon dioxide liquefying device 3 to obtain 139.7Nm gaseous natural gas3The temperature is 22-25 ℃, the gaseous natural gas is heated to 240-250 ℃ through a natural gas preheater 5, then is desulfurized through a desulfurizing device 6 until the sulfur content is less than 10ppb, is heated to 420-450 ℃ through a natural gas heater 7 and is mixed with a certain proportion of steam to enter a natural gas conversion hydrogen production device 8 for conversion reaction to obtain reformed gas at 750-800 ℃, the reformed gas sequentially passes through a steam generator 9 and the natural gas heater 7, the temperature reaches 300-310 ℃, enters a carbon monoxide conversion device 10 for conversion reaction, the reacted gas sequentially passes through a desalted water heater 11, the natural gas preheater 5 and a cooling heat exchange device 13 and then enters a gas-liquid separator I14 for gas-liquid separation, the separated gas enters a pressure swing adsorption device 4 for hydrogen purification and separation, and the purified hydrogen is 450.8Nm3And (3) outputting the purge gas out of the process boundary area, passing the purge gas left after purification and separation through a drying device 15 and a gas-liquid separator II 16 in sequence, deeply removing water in the purge gas, and enabling the dried purge gas to enter a carbon dioxide liquefying device 3 to be converted into 198.8kg of liquid carbon dioxide by utilizing the cold energy of the pressurized LNG.
Claims (6)
1. An LNG hydrogen production and liquid carbon dioxide system comprises an LNG storage tank, a natural gas steam reforming hydrogen production device, a pressure swing adsorption device and a carbon dioxide liquefaction device;
the LNG storage tank is connected with a carbon dioxide liquefaction device, and an LNG low-pressure pump is arranged between the LNG storage tank and the carbon dioxide liquefaction device;
the gas outlet of the carbon dioxide liquefying device is connected with the natural gas steam reforming hydrogen production device;
the gas outlet of the natural gas steam reforming hydrogen production device is connected with the pressure swing adsorption device;
and a product gas outlet of the pressure swing adsorption device is connected with a hydrogen collecting device, a purge gas outlet is connected with the carbon dioxide liquefying device, and a liquid outlet of the carbon dioxide liquefying device is connected with a liquid carbon dioxide collecting device.
2. The system of claim 1, wherein: the natural gas steam reforming hydrogen production device comprises a natural gas preheater, a natural gas heater and a natural gas conversion hydrogen production device which are connected in sequence;
a water vapor inlet of the natural gas conversion hydrogen production device is connected with a steam generator;
a reformed gas outlet of the natural gas conversion hydrogen production device is connected with a carbon monoxide conversion device;
and a gas outlet of the carbon monoxide conversion device is connected with the pressure swing adsorption device.
3. The system of claim 2, wherein: a desulfurization device is arranged between the natural gas preheater and the natural gas heater;
and the inlet of the steam generator is sequentially connected with the desalted water heater and the oxygen removal device.
4. The system of claim 3, wherein: a reformed gas outlet of the natural gas conversion hydrogen production device is sequentially connected with the steam generator, the natural gas heater and the carbon monoxide conversion device;
and a gas outlet of the carbon monoxide conversion device is sequentially connected with the desalted water heater, the natural gas preheater, the cooling heat exchange device, the gas-liquid separation device I and the pressure swing adsorption device.
5. The system according to any one of claims 1-4, wherein: and a drying device is arranged between the pressure swing adsorption device and the carbon dioxide liquefying device.
6. The system of claim 5, wherein: and a gas-liquid separator II is arranged between the drying device and the carbon dioxide liquefying device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120500252.6U CN214456842U (en) | 2021-03-03 | 2021-03-03 | System for LNG hydrogen production and liquid carbon dioxide |
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| CN202120500252.6U CN214456842U (en) | 2021-03-03 | 2021-03-03 | System for LNG hydrogen production and liquid carbon dioxide |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112875644A (en) * | 2021-03-03 | 2021-06-01 | 中海石油气电集团有限责任公司 | System and method for hydrogen production and liquid carbon dioxide production by LNG |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112875644A (en) * | 2021-03-03 | 2021-06-01 | 中海石油气电集团有限责任公司 | System and method for hydrogen production and liquid carbon dioxide production by LNG |
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