CN111322829A - Novel carbon dioxide liquefaction device and preparation method - Google Patents
Novel carbon dioxide liquefaction device and preparation method Download PDFInfo
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- CN111322829A CN111322829A CN202010148160.6A CN202010148160A CN111322829A CN 111322829 A CN111322829 A CN 111322829A CN 202010148160 A CN202010148160 A CN 202010148160A CN 111322829 A CN111322829 A CN 111322829A
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- Prior art keywords
- ammonia
- liquid
- carbon dioxide
- pipeline
- liquid separator
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 148
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 74
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 74
- 238000002360 preparation method Methods 0.000 title claims abstract description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 175
- 239000007788 liquid Substances 0.000 claims abstract description 88
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 49
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 16
- 238000005057 refrigeration Methods 0.000 claims abstract description 10
- 230000001105 regulatory effect Effects 0.000 claims abstract description 9
- 238000002309 gasification Methods 0.000 claims abstract description 7
- 230000005484 gravity Effects 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims 2
- 238000013021 overheating Methods 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 238000009835 boiling Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 7
- 238000009833 condensation Methods 0.000 description 4
- 230000005494 condensation Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
- F25J1/0027—Oxides of carbon, e.g. CO2
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0203—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle
- F25J1/0204—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle as a single flow SCR cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
- F25J1/0257—Construction and layout of liquefaction equipments, e.g. valves, machines
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation By Low-Temperature Treatments (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
The invention discloses a novel carbon dioxide liquefaction device and a preparation method thereof, wherein the device comprises a liquid ammonia tank, an ammonia liquid separator and a carbon dioxide condenser, wherein liquid ammonia in the liquid ammonia tank is conveyed to the bottom of the ammonia liquid separator through a first pipeline and a regulating valve, and the bottom of the ammonia liquid separator conveys the liquid ammonia to the bottom of the carbon dioxide condenser through a second pipeline; liquid ammonia subjected to heat exchange and temperature rise gasification in the carbon dioxide condenser is conveyed to a middle inlet valve of the ammonia liquid separator through a third pipeline; ammonia gas at the upper part of the chamber of the ammonia-liquid separator is conveyed to an inlet of a refrigeration compressor through a fourth pipeline and circularly flows back to a liquid ammonia tank through an evaporative condenser in sequence; and an aluminum finned plate type heat exchanger is arranged in the carbon dioxide condenser, and gaseous carbon dioxide enters the aluminum finned plate type heat exchanger from an upper pipeline and is condensed and then comes out from a lower pipeline. The integrated equipment occupies small space, has high cold energy conversion rate, can ensure stable liquid level and prevent overheating boiling.
Description
Technical Field
This scheme belongs to refrigeration technology field, concretely relates to carbon dioxide liquefaction device.
Background
The volume of the existing carbon dioxide liquefying device is huge, the space utilization rate is reduced, the installation modes are planar arrangement, the space is not fully saved, and the cold quantity conversion rate is not high. Present carbon dioxide liquefaction flow passes through the shell side that pipeline and governing valve got into the carbon dioxide liquefier for liquid ammonia, and governing valve control liquid level, liquid ammonia are gasified at carbon dioxide liquefier shell side decompression, and wherein gas can occupy most heat transfer area, leads to this equipment can be very big, and the liquid ammonia that has just come in simultaneously can become overheated state with gas ammonia, influences heat transfer effect. The shell side of the traditional carbon dioxide liquefier has unstable liquid level, large liquid level fluctuation, overheating of liquid and frequent violent boiling.
Disclosure of Invention
The invention provides a novel carbon dioxide liquefying device and a preparation method thereof, integrated equipment occupies small space, has high cold energy conversion rate, can ensure stable liquid level, and prevents overheating boiling.
The invention provides a novel method for preparing carbon dioxide by liquefaction, which comprises the following steps:
(1) liquid ammonia in the liquid ammonia tank is conveyed to the bottom of an ammonia liquid separator through a first pipeline and a regulating valve, the bottom of the ammonia liquid separator conveys the liquid ammonia to the bottom of a carbon dioxide condenser through a second pipeline, and the liquid ammonia is kept at the same horizontal height in the ammonia liquid separator and the carbon dioxide condenser;
(2) liquid ammonia subjected to heat exchange and temperature rise gasification in the carbon dioxide condenser is conveyed to a middle inlet valve of the ammonia liquid separator through a third pipeline with an elbow opening facing downwards; ammonia gas at the upper part of the chamber of the ammonia-liquid separator is conveyed to an inlet of a refrigeration compressor through a fourth pipeline with an upward opening of an elbow, and circularly flows back to a liquid ammonia tank through an evaporative condenser in sequence;
(3) and an aluminum finned plate heat exchanger is arranged in the carbon dioxide condenser, and gaseous carbon dioxide enters the aluminum finned plate heat exchanger from an upper pipeline and is condensed and then discharged from a lower pipeline to prepare a product.
Further, in the step 1, the liquid ammonia in the liquid ammonia tank automatically flows to the bottom of the ammonia liquid separator through gravity, and the slow flow is controlled through the regulating valve, so that the liquid ammonia is prevented from being overheated.
Furthermore, in the step 2, a wave reduction buffer layer is arranged on the inner wall of the chamber of the ammonia liquid separator, so that the liquid level in the ammonia liquid separator is controlled to be stable.
The invention also provides a novel carbon dioxide liquefaction device, which comprises a liquid ammonia tank, an ammonia liquid separator and a carbon dioxide condenser, wherein liquid ammonia in the liquid ammonia tank is conveyed to the bottom of the ammonia liquid separator through a first pipeline and a regulating valve, and the bottom of the ammonia liquid separator conveys the liquid ammonia to the bottom of the carbon dioxide condenser through a second pipeline; liquid ammonia subjected to heat exchange and temperature rise gasification in the carbon dioxide condenser is conveyed to a middle inlet valve of the ammonia liquid separator through a third pipeline with an elbow opening facing downwards; ammonia gas at the upper part of the chamber of the ammonia-liquid separator is conveyed to an inlet of a refrigeration compressor through a fourth pipeline with an upward opening of an elbow, and circularly flows back to a liquid ammonia tank through an evaporative condenser in sequence; and an aluminum finned plate type heat exchanger is arranged in the carbon dioxide condenser, and gaseous carbon dioxide enters the aluminum finned plate type heat exchanger from an upper pipeline and is condensed and then comes out from a lower pipeline.
Further, a control valve and a gas pressure sensor are arranged at the top of the ammonia-liquid separator and at the inlet of the fourth pipeline. The amount of ammonia entering the refrigeration compressor can be accurately controlled, and the optimal condensation effect is achieved.
Further, the second pipe is a horizontal pipe, so that the liquid ammonia is located at the same level in the ammonia liquid separator and the carbon dioxide condenser.
Further, liquid ammonia in the liquid ammonia tank automatically flows to the bottom of the ammonia liquid separator through gravity, and is controlled to slowly flow through the adjusting valve, so that overheating of the liquid ammonia is prevented. And a wave reduction buffer layer is arranged on the inner wall of the chamber of the ammonia-liquid separator, so that the stability of the liquid level in the ammonia-liquid separator is controlled.
Compared with the prior art, the invention has the beneficial effects that:
(1) integrated installation has set up liquid ammonia jar, ammonia-liquid separator and carbon dioxide condenser, and ammonia-liquid separator stores liquid ammonia, can accurate control get into compressor's ammonia volume, reaches the best condensation effect, and independent safety control liquid ammonia is stored.
(2) The carbon dioxide liquefier adopts the aluminium system fin formula plate heat exchanger, has improved cold volume conversion rate greatly, and the volume is less than traditional carbon dioxide liquefier, and area is little, and equipment investment is little with low costs.
(3) Liquid ammonia in the ammonia-liquid separator is supplied to the carbon dioxide liquefier through gravity, a suction device is not needed, liquid overheating does not exist, and gas does not enter the heat exchanger to influence the heat exchange effect. And a wave reduction buffer layer is arranged on the inner wall of the chamber of the ammonia-liquid separator, so that the liquid level in the ammonia-liquid separator is controlled not to fluctuate. The liquid level in the ammonia liquid separator is stable relative to the liquid level of the shell side of the traditional carbon dioxide liquefier, and does not boil violently.
Drawings
Fig. 1 is a schematic structural diagram of a novel carbon dioxide liquefaction device of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments,
referring to fig. 1, the invention further provides a novel carbon dioxide liquefaction device, which comprises a liquid ammonia tank 1, an ammonia liquid separator 2 and a carbon dioxide condenser 3, wherein liquid ammonia in the liquid ammonia tank is conveyed to the bottom of the ammonia liquid separator through a first pipeline 11 and a regulating valve 4, and the bottom of the ammonia liquid separator is conveyed to the bottom of the carbon dioxide condenser through a second pipeline 22; liquid ammonia subjected to heat exchange and temperature rise gasification in the carbon dioxide condenser is conveyed to a middle inlet valve of the ammonia liquid separator through a third pipeline 33 with an elbow opening facing downwards; the ammonia gas at the upper part of the chamber of the ammonia liquid separator is conveyed to the inlet of the refrigeration compressor 5 through a fourth pipeline 44 with an upward opening of an elbow, and circularly flows back to the liquid ammonia tank 1 through the evaporative condenser 6 in sequence; an aluminum finned plate type heat exchanger 7 is arranged in the carbon dioxide condenser, gaseous carbon dioxide enters the aluminum finned plate type heat exchanger from an upper pipeline 55, and condensed liquid carbon dioxide comes out from a lower pipeline 66.
Further, a control valve 8 and a gas pressure sensor 9 are provided at the top of the ammonia liquid separator at the inlet of the fourth pipe 44. The amount of ammonia entering the refrigeration compressor can be accurately controlled, and the optimal condensation effect is achieved.
The second pipeline is a horizontal pipeline, so that the liquid ammonia is positioned at the same level in the ammonia liquid separator and the carbon dioxide condenser. Liquid ammonia in the liquid ammonia tank flows to the ammonia liquid separator bottom through gravity is automatic, through governing valve control slow flow prevents that liquid ammonia is overheated. And a wave reduction buffer layer is arranged on the inner wall of the chamber of the ammonia-liquid separator, so that the stability of the liquid level in the ammonia-liquid separator is controlled.
The invention also provides a novel carbon dioxide liquefaction preparation method, which comprises the steps of
(1) Liquid ammonia in the liquid ammonia tank is conveyed to the bottom of an ammonia liquid separator through a first pipeline and a regulating valve, the bottom of the ammonia liquid separator conveys the liquid ammonia to the bottom of a carbon dioxide condenser through a second pipeline, and the liquid ammonia is kept at the same horizontal height in the ammonia liquid separator and the carbon dioxide condenser;
(2) liquid ammonia subjected to heat exchange and temperature rise gasification in the carbon dioxide condenser is conveyed to a middle inlet valve of the ammonia liquid separator through a third pipeline with an elbow opening facing downwards; ammonia gas at the upper part of the chamber of the ammonia-liquid separator is conveyed to an inlet of a refrigeration compressor through a fourth pipeline with an upward opening of an elbow, and circularly flows back to a liquid ammonia tank through an evaporative condenser in sequence;
(3) and an aluminum finned plate heat exchanger is arranged in the carbon dioxide condenser, and gaseous carbon dioxide enters the aluminum finned plate heat exchanger from an upper pipeline and is condensed and then discharged from a lower pipeline to prepare a product.
The utility model provides a novel integrated installation of carbon dioxide liquefaction device has set up liquid ammonia jar, ammonia-liquid separator and carbon dioxide condenser, and ammonia-liquid separator stores liquid ammonia, can accurate control get into compressor's ammonia volume, reaches the best condensation effect, and independent safety control liquid ammonia is stored. The carbon dioxide liquefier adopts an aluminum finned plate heat exchanger, so that the cold energy conversion rate is greatly improved, and the volume of the carbon dioxide liquefier is smaller than that of the traditional carbon dioxide liquefier. Liquid ammonia in the ammonia-liquid separator is supplied to the carbon dioxide liquefier through gravity, a suction device is not needed, liquid overheating does not exist, and gas does not enter the heat exchanger to influence the heat exchange effect. And a wave reduction buffer layer is arranged on the inner wall of the chamber of the ammonia-liquid separator, so that the liquid level in the ammonia-liquid separator is controlled not to fluctuate. The liquid level in the ammonia liquid separator is stable relative to the liquid level of the shell side of the traditional carbon dioxide liquefier, and does not boil violently.
Claims (8)
1. A novel carbon dioxide liquefaction preparation method comprises the following steps:
(1) liquid ammonia in the liquid ammonia tank is conveyed to the bottom of an ammonia liquid separator through a first pipeline and a regulating valve, the bottom of the ammonia liquid separator conveys the liquid ammonia to the bottom of a carbon dioxide condenser through a second pipeline, and the liquid ammonia is kept at the same horizontal height in the ammonia liquid separator and the carbon dioxide condenser;
(2) liquid ammonia subjected to heat exchange and temperature rise gasification in the carbon dioxide condenser is conveyed to a middle inlet valve of the ammonia liquid separator through a third pipeline with an elbow opening facing downwards; ammonia gas at the upper part of the chamber of the ammonia-liquid separator is conveyed to an inlet of a refrigeration compressor through a fourth pipeline with an upward opening of an elbow, and circularly flows back to a liquid ammonia tank through an evaporative condenser in sequence;
(3) and an aluminum finned plate heat exchanger is arranged in the carbon dioxide condenser, and gaseous carbon dioxide enters the aluminum finned plate heat exchanger from an upper pipeline and is condensed and then discharged from a lower pipeline to prepare a product.
2. The novel method for liquefied production of carbon dioxide according to claim 1, wherein: in the step 1, liquid ammonia in the liquid ammonia tank automatically flows to the bottom of the ammonia liquid separator through gravity, and the slow flow is controlled through the regulating valve, so that the liquid ammonia is prevented from being overheated.
3. The novel method for liquefied production of carbon dioxide according to claim 1, wherein: in the step 2, the inner wall of the chamber of the ammonia liquid separator is provided with a wave reduction buffer layer to control the liquid level in the ammonia liquid separator to be stable.
4. A novel carbon dioxide liquefaction device which characterized in that: the system comprises a liquid ammonia tank, an ammonia liquid separator and a carbon dioxide condenser, wherein liquid ammonia in the liquid ammonia tank is conveyed to the bottom of the ammonia liquid separator through a first pipeline and a regulating valve, and the bottom of the ammonia liquid separator conveys the liquid ammonia to the bottom of the carbon dioxide condenser through a second pipeline; liquid ammonia subjected to heat exchange and temperature rise gasification in the carbon dioxide condenser is conveyed to a middle inlet valve of the ammonia liquid separator through a third pipeline with an elbow opening facing downwards; ammonia gas at the upper part of the chamber of the ammonia-liquid separator is conveyed to an inlet of a refrigeration compressor through a fourth pipeline with an upward opening of an elbow, and circularly flows back to a liquid ammonia tank through an evaporative condenser in sequence; and an aluminum finned plate type heat exchanger is arranged in the carbon dioxide condenser, and gaseous carbon dioxide enters the aluminum finned plate type heat exchanger from an upper pipeline and is condensed and then comes out from a lower pipeline.
5. The novel carbon dioxide liquefaction device of claim 4, characterized in that: and a control valve and a gas pressure sensor are arranged at the inlet of the fourth pipeline at the top of the ammonia-liquid separator.
6. The novel carbon dioxide liquefaction device of claim 4, characterized in that: the second pipeline is a horizontal pipeline, so that the liquid ammonia is positioned at the same level in the ammonia liquid separator and the carbon dioxide condenser.
7. The novel carbon dioxide liquefaction device of claim 4, characterized in that: liquid ammonia in the liquid ammonia tank flows to the ammonia liquid separator bottom through gravity is automatic, through governing valve control slow flow prevents that liquid ammonia is overheated.
8. The novel carbon dioxide liquefaction device of claim 4, characterized in that: and a wave reduction buffer layer is arranged on the inner wall of the chamber of the ammonia-liquid separator, so that the stability of the liquid level in the ammonia-liquid separator is controlled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010148160.6A CN111322829B (en) | 2020-03-05 | 2020-03-05 | Novel carbon dioxide liquefaction device and preparation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010148160.6A CN111322829B (en) | 2020-03-05 | 2020-03-05 | Novel carbon dioxide liquefaction device and preparation method |
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| CN111322829A true CN111322829A (en) | 2020-06-23 |
| CN111322829B CN111322829B (en) | 2021-07-20 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0699013A (en) * | 1992-09-21 | 1994-04-12 | Chubu Electric Power Co Inc | Recovery method for separating carbon dioxide from waste combustion gas |
| CN201607093U (en) * | 2009-11-27 | 2010-10-13 | 北京高新利华催化材料制造有限公司 | Device for recovering liquefied carbon dioxide in petrochemical tail gas |
| CN202281456U (en) * | 2011-10-26 | 2012-06-20 | 唐加彬 | Liquefier for collecting carbon dioxide |
| CN208170858U (en) * | 2018-04-09 | 2018-11-30 | 福建省石油化学工业设计院 | Co 2 liquefaction recyclable device |
| CN208804957U (en) * | 2018-10-10 | 2019-04-30 | 惠州市华达通石化有限公司 | The heat recycling system of liquid CO 2 purification |
| CN209341680U (en) * | 2019-01-23 | 2019-09-03 | 重庆同辉气体有限公司 | The cold liquefier of co 2 liquefaction ammonia |
-
2020
- 2020-03-05 CN CN202010148160.6A patent/CN111322829B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0699013A (en) * | 1992-09-21 | 1994-04-12 | Chubu Electric Power Co Inc | Recovery method for separating carbon dioxide from waste combustion gas |
| CN201607093U (en) * | 2009-11-27 | 2010-10-13 | 北京高新利华催化材料制造有限公司 | Device for recovering liquefied carbon dioxide in petrochemical tail gas |
| CN202281456U (en) * | 2011-10-26 | 2012-06-20 | 唐加彬 | Liquefier for collecting carbon dioxide |
| CN208170858U (en) * | 2018-04-09 | 2018-11-30 | 福建省石油化学工业设计院 | Co 2 liquefaction recyclable device |
| CN208804957U (en) * | 2018-10-10 | 2019-04-30 | 惠州市华达通石化有限公司 | The heat recycling system of liquid CO 2 purification |
| CN209341680U (en) * | 2019-01-23 | 2019-09-03 | 重庆同辉气体有限公司 | The cold liquefier of co 2 liquefaction ammonia |
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| CN111322829B (en) | 2021-07-20 |
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Address after: No.1, Aotou Youcheng West Road, Dayawan, Huizhou, Guangdong 516000 Applicant after: Huizhou huadatong Gas Manufacturing Co.,Ltd. Address before: 510726 room 1715, building 1, poly Zhongyu Plaza, 319 Dashadi East, Huangpu District, Guangzhou City, Guangdong Province Applicant before: HUIZHOU HUADATONG PETROCHEMICAL Co.,Ltd. |
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Inventor after: Shi Wei Inventor after: Zeng Yangwen Inventor after: Liu Feng Inventor before: Shi Wei Inventor before: Zeng Yangwen Inventor before: Liu Feng |