CN214620294U - Device for producing industrial grade and food grade carbon dioxide by adopting double-tower rectification - Google Patents
Device for producing industrial grade and food grade carbon dioxide by adopting double-tower rectification Download PDFInfo
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- CN214620294U CN214620294U CN202122327477.9U CN202122327477U CN214620294U CN 214620294 U CN214620294 U CN 214620294U CN 202122327477 U CN202122327477 U CN 202122327477U CN 214620294 U CN214620294 U CN 214620294U
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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
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/08—Separating gaseous impurities from gases or gaseous mixtures or from liquefied gases or liquefied gaseous mixtures
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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
- F25J2200/00—Processes or apparatus using separation by rectification
- F25J2200/04—Processes or apparatus using separation by rectification in a dual pressure main column system
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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
- F25J2200/00—Processes or apparatus using separation by rectification
- F25J2200/74—Refluxing the column with at least a part of the partially condensed overhead gas
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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
- F25J2200/00—Processes or apparatus using separation by rectification
- F25J2200/78—Refluxing the column with a liquid stream originating from an upstream or downstream fractionator column
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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
- F25J2200/00—Processes or apparatus using separation by rectification
- F25J2200/90—Details relating to column internals, e.g. structured packing, gas or liquid distribution
- F25J2200/94—Details relating to the withdrawal point
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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
- F25J2215/00—Processes characterised by the type or other details of the product stream
- F25J2215/80—Carbon dioxide
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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
- F25J2220/00—Processes or apparatus involving steps for the removal of impurities
- F25J2220/80—Separating impurities from carbon dioxide, e.g. H2O or water-soluble contaminants
- F25J2220/82—Separating low boiling, i.e. more volatile components, e.g. He, H2, CO, Air gases, CH4
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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
- F25J2220/00—Processes or apparatus involving steps for the removal of impurities
- F25J2220/80—Separating impurities from carbon dioxide, e.g. H2O or water-soluble contaminants
- F25J2220/84—Separating high boiling, i.e. less volatile components, e.g. NOx, SOx, H2S
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
The utility model belongs to a device for producing industrial grade and food grade carbon dioxide by adopting double-tower rectification; the device comprises a raw material gas pipeline, wherein the raw material gas pipeline is connected with the inside of a first rectifying tower for primary rectification through a gas inlet of the first rectifying tower, a middle liquid-phase outlet of the first rectifying tower is connected with an industrial-grade carbon dioxide storage tank, a gas-phase outlet at the top of the first rectifying tower is connected with a first cooling and separating unit, a gas-phase outlet of the first cooling and separating unit is connected with a second cooling and separating unit, a liquid-phase outlet of the second cooling and separating unit is connected with the inside of a second rectifying tower for secondary rectification through an upper liquid-phase inlet of the second rectifying tower, and a liquid-phase outlet at the bottom of the second rectifying tower is connected with a food-grade carbon dioxide storage tank; the device has the advantages of simple structure, reasonable flow design, simple and convenient operation, low cost investment cost and operation cost, small occupied area and capability of simultaneously producing industrial-grade and food-grade carbon dioxide.
Description
Technical Field
The utility model belongs to the technical field of carbon dioxide production, specifically be an adopt two tower rectification to produce device of industrial grade and food level carbon dioxide.
Background
Carbon dioxide is a carbon oxide with a chemical formula of CO2, and is colorless and odorless at normal temperature and normal pressure, and the aqueous solution of the carbon dioxide is slightly sour; the application is wide, the polyethylene polymer can be used in the electronic industry, the polyethylene polymer can be used as a regulator in the reaction, and the solid carbon dioxide photoreaction is used for refrigerated dairy products, meat, frozen foods and other perishable foods in transportation; the gaseous carbon dioxide is used for carbonizing soft drinks, chemical processing, food preservation, inert protection in chemical and food processing processes, welding gas, plant growth stimulator; taking welding gas as an example, the most common welding modes of hoisting equipment are mixed gas shielded welding and submerged arc automatic welding, wherein the common shielding gas for mixed gas shielded welding is carbon dioxide. The carbon dioxide gas shielded welding has the greatest characteristic that oxygen in the air can be prevented from contacting with the metal melted at the welding point at high temperature, and the metal in the welding process can be protected from oxidation, so that the carbon dioxide gas shielded welding is one of the most important welding methods for ferrous metal materials. Compared with a common welding mode, the advantages of carbon dioxide gas shielded welding are also obvious, and can be embodied in the following aspects: 1. the welding cost is low. The cost is only 40-50% of that of submerged arc welding and shielded metal arc welding. 2. The production efficiency is high. The productivity is 1-4 times of the welding rod arc welding. 3. The crack resistance of the welding seam is high. The weld is low in hydrogen and low in nitrogen content. 4. The deformation after welding is small. The angular deformation is five thousandths, and the unevenness is only three thousandths; 5. the welding spatter is small. When an ultra-low carbon alloy welding wire or a flux-cored welding wire is adopted, or Ar is added into CO2, welding spatter can be reduced. 6. The carbon dioxide gas raw material is easy to extract and refine, the preparation difficulty in the welding process is reduced to a great extent, the application range is wider, the operation is simple and convenient, open arc welding can be carried out, all-position welding can be carried out, downward welding can be carried out, the thickness of a workpiece is not limited, and the welding device is friendly to operators.
At present, chemical production enterprises mainly adopt the following methods to produce food-grade carbon dioxide: industrial carbon dioxide is produced firstly by a rectification method, and then the industrial carbon dioxide is taken as a raw material, and food-grade carbon dioxide is prepared by adsorption and catalytic oxidation on the basis; the method has the defects of complex process flow, large equipment quantity, large occupied area, high energy consumption, oxygen consumption, periodic replacement of the adsorbent and high operation cost.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the defect among the prior art, and provide a simple structure, flow reasonable in design, control simple and convenient, roll over this investment cost and running cost low, area is little and can realize the device of the two tower rectification production industry level of adoption and food level carbon dioxide of output industry level and food level carbon dioxide simultaneously.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
the utility model provides an adopt device of two tower rectification production industrial grade and food level carbon dioxide, the device includes the feed gas pipeline, the feed gas pipeline links to each other with the first rectifying column inside that is used for once rectifying through the air inlet of first rectifying column, the middle part liquid phase export of first rectifying column links to each other with the industrial grade carbon dioxide storage tank that is used for collecting industrial grade carbon dioxide, the gaseous phase export at first rectifying column top links to each other with first cooling and separation unit, the gaseous phase export of first cooling and separation unit links to each other with second cooling and separation unit, the liquid phase export of second cooling and separation unit links to each other with the second rectifying column inside that is used for the secondary rectification through the upper portion liquid phase import of second rectifying column, the liquid phase export of second rectifying column bottom links to each other with the food level carbon dioxide storage tank that is used for collecting food level carbon dioxide.
Preferably, a tee joint is arranged between the gas phase outlet at the top of the first rectifying tower and the first cooling and separating unit, and the third end of the tee joint is connected with the gas phase outlet at the top of the second rectifying tower.
Preferably, the first cooling and separating unit comprises a first heat exchanger and a first gas-liquid separator; the inlet end of the first heat exchanger is connected with the tee joint, and the outlet end of the first heat exchanger is connected with the inlet of the first gas-liquid separator.
Preferably, the liquid phase outlet of the first gas-liquid separator is connected with a reflux opening at the upper part of the first rectifying tower.
Preferably, the second cooling and separating unit comprises a second heat exchanger and a second gas-liquid separator; the inlet end of the second heat exchanger is connected with the gas-phase outlet of the first gas-liquid separator, the outlet end of the second heat exchanger is connected with the inlet of the second gas-liquid separator, and the liquid-phase outlet of the second gas-liquid separator is connected with the upper liquid-phase inlet of the second rectifying tower; and a gas phase outlet of the second gas-liquid separator is connected with a tail gas treatment device.
Preferably, the liquid phase outlet at the bottom of the first rectifying tower is connected with a tail gas treatment device.
Preferably, the middle liquid phase outlet of the first rectifying tower is connected with an industrial-grade carbon dioxide storage tank through a first channel of the subcooler; and a liquid phase outlet at the bottom of the second rectifying tower is connected with a food-grade carbon dioxide storage tank through a second channel of the subcooler.
Preferably, the subcooler is a plate-fin heat exchanger.
Preferably, the system also comprises a cold box, wherein a first rectifying tower, a second rectifying tower, a first heat exchanger, a first gas-liquid separator, a second heat exchanger, a second gas-liquid separator and a subcooler are arranged in the cold box.
The utility model has the advantages of simple structure, flow reasonable in design, control portably, roll over this investment cost and running cost low, area is little and can realize output industrial grade and food level carbon dioxide simultaneously.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic view of the external structure of the middle belt cooling box of the present invention.
In the upper diagram:
1. a feed gas pipeline; 2. a first rectification column; 3. a second rectification column; 4. an industrial-grade carbon dioxide storage tank; 5. a food-grade carbon dioxide storage tank; 6. a first heat exchanger; 7. a first gas-liquid separator; 8. a second heat exchanger; 9. a second gas-liquid separator; 10. a tail gas treatment device; 11. a subcooler; 12. and (5) cooling the box.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to FIGS. 1-2: the utility model relates to an adopt device of two tower rectification production industrial grade and food level carbon dioxide, the device includes feed gas pipeline 1, feed gas pipeline 1 links to each other with 2 inside first rectifying column that are used for once rectifying through the air inlet of first rectifying column 2, the middle part liquid phase export of first rectifying column 2 links to each other with industrial grade carbon dioxide storage tank 4 that is used for collecting industrial grade carbon dioxide, the gaseous phase export at 2 tops of first rectifying column links to each other with first cooling and separation unit, the gaseous phase export of first cooling and separation unit links to each other with second cooling and separation unit, the liquid phase export of second cooling and separation unit is imported and is used for the inside linking to each other of second rectifying column 3 of secondary rectification through the upper portion liquid phase of second rectifying column 3, the liquid phase export of 3 bottoms of second rectifying column links to each other with 5 carbon dioxide storage tanks that are used for collecting food level carbon dioxide. The utility model discloses with the purpose of preparing industrial carbon dioxide and food level carbon dioxide simultaneously in the form of two rectifying towers establishing ties, its difference with conventional many towers rectification lies in that the middle part of first rectifying tower 2 is equipped with the liquid mouth of getting of industrial carbon dioxide, not only can reach the purpose of collecting industrial carbon dioxide, can also reduce the load for cooling separation element and second rectifying tower 3 to and for the backward flow of first rectifying tower 2 and the preparation of food level carbon dioxide has created the condition; the utility model discloses a two-stage cooling separation unit cools off the separation to the gaseous phase, and first cooling separation unit provides the reflux for first rectifying column 2, and second cooling separation unit provides raw materials liquid for second rectifying column 3 so that prepare food level carbon dioxide.
Furthermore, a tee joint is arranged between a gas phase outlet at the top of the first rectifying tower 2 and the first cooling and separating unit, and the third end of the tee joint is connected with a gas phase outlet at the top of the second rectifying tower 3. Through the arrangement, the gas phase of the first rectifying tower 2 and the gas phase of the second rectifying tower 3 can be uniformly treated, so that equipment investment can be saved, and the gas phase after rectification can be effectively recycled, so that the aims of saving cost, maximizing resource utilization and ensuring stable operation of the device are fulfilled.
Further, the first cooling and separating unit comprises a first heat exchanger 6 and a first gas-liquid separator 7; the inlet end of the first heat exchanger 6 is connected with the tee joint, and the outlet end of the first heat exchanger 6 is connected with the inlet of the first gas-liquid separator 7. The utility model discloses the gaseous phase to producing in first rectifying column 2 and the second rectifying column 3 adopts cascaded cooling and the mode that the segmentation utilized, and this mode has not only guaranteed the steady operation of system, and can make first cooling separation unit carry out the precooling and preseparation to the gaseous phase, establishes the basis for the degree of depth cooling and the degree of depth separation in later stage.
Further, a liquid phase outlet of the first gas-liquid separator 7 is connected with a reflux inlet at the upper part of the first rectifying tower 2.
Further, the second cooling and separating unit comprises a second heat exchanger 8 and a second gas-liquid separator 9; the inlet end of the second heat exchanger 8 is connected with the gas-phase outlet of the first gas-liquid separator 7, the outlet end of the second heat exchanger 8 is connected with the inlet of the second gas-liquid separator 9, and the liquid-phase outlet of the second gas-liquid separator 9 is connected with the upper liquid-phase inlet of the second rectifying tower 3; the gas phase outlet of the second gas-liquid separator 9 is connected with a tail gas treatment device 10. The liquid phase deeply cooled and deeply separated by the second cooling and separating unit is used as the raw material liquid of the second rectifying tower 3 for preparing the food grade carbon dioxide, and the gas phase which is non-condensable gas can be conveyed to the tail gas treatment device 10 for subsequent treatment.
Further, a liquid phase outlet at the bottom of the first rectifying tower 2 is connected with a tail gas treatment device 10.
Further, a middle liquid phase outlet of the first rectifying tower 2 is connected with the industrial-grade carbon dioxide storage tank 4 through a first channel of the subcooler 11; and a liquid phase outlet at the bottom of the second rectifying tower 3 is connected with the food-grade carbon dioxide storage tank 5 through a second channel of the subcooler 11. The utility model discloses a subcooler 11 makes industrial carbon dioxide of output in the first rectifying column 2 and the food level carbon dioxide of output and the inside refrigerant heat transfer of plate-fin heat exchanger in the second rectifying column 3 to reach the super-cooled rate that improves the product, can reduce product storage loss after getting into industrial carbon dioxide storage tank 4 and food level carbon dioxide storage tank 5 respectively.
Further, the subcooler 11 is a plate-fin heat exchanger.
Further, the system also comprises a cold box 12, wherein a first rectifying tower 2, a second rectifying tower 3, a first heat exchanger 6, a first gas-liquid separator 7, a second heat exchanger 8, a second gas-liquid separator 9 and a subcooler 11 are arranged in the cold box 12. The utility model discloses a place each equipment of above-mentioned in cold box 12 can effectively practice thrift the space, reduce the area of relevant equipment, and can reach the purpose of the control of being convenient for.
A method for preparing industrial-grade and food-grade carbon dioxide by a device for producing the industrial-grade and food-grade carbon dioxide by double-tower rectification comprises the following steps: step 1: the raw material gas in the raw material gas pipeline 1 enters the first rectifying tower 2 through the gas inlet of the first rectifying tower 2 for rectification; the purity of the feed gas CO2 is more than or equal to 95%, the water content is less than or equal to 400ppm, other components are oxygen, nitrogen, methane and the like, the pressure is 25-27 barA, and the temperature is normal temperature; step 2: the feed gas enters the middle-lower part of the first rectifying tower 2 and is subjected to mass transfer and heat transfer with liquid from a reflux port at the upper part of the first rectifying tower 2, heavy components in the feed gas are liquefied and continuously accumulated at the bottom of the tower, and light components are discharged from the top of the first rectifying tower 2; and step 3: gas phase discharged from a gas phase outlet at the top of the first rectifying tower 2 enters a first heat exchanger 6 to be cooled to minus 14 ℃ to minus 18 ℃, a large amount of carbon dioxide is liquefied after cooling, the gas phase is changed into a gas-liquid mixed state and enters a first gas-liquid separator 7 to be subjected to gas-liquid separation, and liquid phase flows back into the first rectifying tower 2 through a reflux opening at the upper part of the first rectifying tower 2; and 4, step 4: the gas phase in the first gas-liquid separator 7 enters a second heat exchanger 8 for deep cooling, is cooled to-23 to-28 ℃, and a small amount of carbon dioxide is liquefied, so that the gas phase is changed into a gas-liquid mixed state again and enters a second gas-liquid separator 9 for gas-liquid separation; and 5: the carbon dioxide liquid with higher concentration obtained after gas-liquid separation by the second gas-liquid separator 9 enters the second rectifying tower 3 to be rectified again to obtain food-grade carbon dioxide, and the rectified gas phase is sent to the third end of the tee joint to be mixed with the gas phase in the first rectifying tower 2 for repeated cooling and separation; step 6: gas-liquid separation is carried out through a second gas-liquid separator 9 to obtain a gas phase which is non-condensable gas, and the gas phase is sent to a tail gas treatment device 10; and 7: the liquid phase at the bottom of the first rectifying tower 2 is sent to a tail gas treatment device 10 for treatment; and 8: industrial-grade carbon dioxide products are extracted from the middle part of the first rectifying tower 2, enter a first channel of the subcooler 11, are cooled to minus 23 to minus 26 ℃, and are sent into the industrial-grade carbon dioxide storage tank 4; and step 9: liquid-phase food-grade carbon dioxide discharged from the bottom of the second rectifying tower 3 enters a second channel of the subcooler 11 for heat exchange, and the temperature of the food-grade carbon dioxide after heat exchange is as follows: and (3) feeding the carbon dioxide into a food-grade carbon dioxide storage tank 5 at the temperature of-23 to-26 ℃, wherein the purity of the food-grade carbon dioxide product is more than 99.995%.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (9)
1. An apparatus for producing technical and food grade carbon dioxide using double column rectification, the apparatus comprising a feed gas pipeline (1), characterized in that: the raw material gas pipeline (1) is connected with the inside of a first rectifying tower (2) for primary rectification through a gas inlet of the first rectifying tower (2),
the middle liquid phase outlet of the first rectifying tower (2) is connected with an industrial carbon dioxide storage tank (4) for collecting industrial carbon dioxide,
a gas phase outlet at the top of the first rectifying tower (2) is connected with the first cooling separation unit, a gas phase outlet of the first cooling separation unit is connected with the second cooling separation unit, a liquid phase outlet of the second cooling separation unit is connected with the inside of the second rectifying tower (3) for secondary rectification through an upper liquid phase inlet of the second rectifying tower (3),
a liquid phase outlet at the bottom of the second rectifying tower (3) is connected with a food grade carbon dioxide storage tank (5) for collecting food grade carbon dioxide.
2. The plant for producing carbon dioxide of technical grade and food grade by means of double column rectification according to claim 1, characterized in that: a tee joint is arranged between a gas-phase outlet at the top of the first rectifying tower (2) and the first cooling and separating unit, and the third end of the tee joint is connected with a gas-phase outlet at the top of the second rectifying tower (3).
3. The plant for the production of carbon dioxide of technical grade and food grade by means of double column rectification according to claim 1 or 2, characterized in that: the first cold separation unit comprises a first heat exchanger (6) and a first gas-liquid separator (7);
the inlet end of the first heat exchanger (6) is connected with the tee joint, and the outlet end of the first heat exchanger (6) is connected with the inlet of the first gas-liquid separator (7).
4. The plant for the production of carbon dioxide of technical grade and food grade by means of double column rectification according to claim 3, characterized in that: and a liquid phase outlet of the first gas-liquid separator (7) is connected with a reflux opening at the upper part of the first rectifying tower (2).
5. The plant for the production of carbon dioxide of technical grade and food grade by means of double column rectification according to claim 3, characterized in that: the second cooling and separating unit comprises a second heat exchanger (8) and a second gas-liquid separator (9); the inlet end of the second heat exchanger (8) is connected with the gas-phase outlet of the first gas-liquid separator (7), the outlet end of the second heat exchanger (8) is connected with the inlet of the second gas-liquid separator (9), and the liquid-phase outlet of the second gas-liquid separator (9) is connected with the upper liquid-phase inlet of the second rectifying tower (3);
the gas phase outlet of the second gas-liquid separator (9) is connected with a tail gas treatment device (10).
6. The plant for producing carbon dioxide of technical grade and food grade by means of double column rectification according to claim 1, characterized in that: and a liquid phase outlet at the bottom of the first rectifying tower (2) is connected with a tail gas treatment device (10).
7. The plant for the production of carbon dioxide of technical grade and food grade by means of double column rectification according to claim 1 or 2 or 4 or 5 or 6, characterized in that: the middle liquid phase outlet of the first rectifying tower (2) is connected with the industrial-grade carbon dioxide storage tank (4) through a first channel of the subcooler (11);
and a liquid phase outlet at the bottom of the second rectifying tower (3) is connected with the food-grade carbon dioxide storage tank (5) through a second channel of the subcooler (11).
8. The plant for producing carbon dioxide of technical grade and food grade by means of double column rectification according to claim 7, characterized in that: the subcooler (11) is a plate-fin heat exchanger.
9. The plant for producing carbon dioxide of technical grade and food grade by means of double column rectification according to claim 1, characterized in that: the gas-liquid separator is characterized by further comprising a cold box (12), wherein a first rectifying tower (2), a second rectifying tower (3), a first heat exchanger (6), a first gas-liquid separator (7), a second heat exchanger (8), a second gas-liquid separator (9) and a subcooler (11) are arranged inside the cold box (12).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122327477.9U CN214620294U (en) | 2021-09-26 | 2021-09-26 | Device for producing industrial grade and food grade carbon dioxide by adopting double-tower rectification |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122327477.9U CN214620294U (en) | 2021-09-26 | 2021-09-26 | Device for producing industrial grade and food grade carbon dioxide by adopting double-tower rectification |
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| CN214620294U true CN214620294U (en) | 2021-11-05 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114017994A (en) * | 2021-11-08 | 2022-02-08 | 重庆瑞信气体有限公司 | Process for purifying carbon dioxide from alcohol tail gas |
| CN115072722A (en) * | 2022-07-05 | 2022-09-20 | 重庆朗福环保科技有限公司 | Edible carbon dioxide liquefaction preparation method and device |
| EP4368929A1 (en) * | 2022-11-10 | 2024-05-15 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Method and apparatus for distillation of carbon dioxide |
-
2021
- 2021-09-26 CN CN202122327477.9U patent/CN214620294U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114017994A (en) * | 2021-11-08 | 2022-02-08 | 重庆瑞信气体有限公司 | Process for purifying carbon dioxide from alcohol tail gas |
| CN114017994B (en) * | 2021-11-08 | 2023-03-10 | 重庆瑞信气体有限公司 | Process for purifying carbon dioxide from alcohol tail gas |
| CN115072722A (en) * | 2022-07-05 | 2022-09-20 | 重庆朗福环保科技有限公司 | Edible carbon dioxide liquefaction preparation method and device |
| EP4368929A1 (en) * | 2022-11-10 | 2024-05-15 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Method and apparatus for distillation of carbon dioxide |
| FR3141996A1 (en) * | 2022-11-10 | 2024-05-17 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Carbon dioxide distillation process and apparatus |
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