CN217686022U - Dry ice generator and carbon dioxide capture system - Google Patents
Dry ice generator and carbon dioxide capture system Download PDFInfo
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- CN217686022U CN217686022U CN202221067882.XU CN202221067882U CN217686022U CN 217686022 U CN217686022 U CN 217686022U CN 202221067882 U CN202221067882 U CN 202221067882U CN 217686022 U CN217686022 U CN 217686022U
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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
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- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
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Abstract
The utility model discloses a dry ice generator and carbon dioxide entrapment system. The dry ice generator comprises a cavity, a feeding pipeline, a gas-phase carbon dioxide outlet and a dry ice outlet; the feeding pipeline horizontally penetrates through the wall surface of the cavity, one end of the feeding pipeline is a liquid-phase carbon dioxide inlet, a sprayer is arranged on the feeding pipeline positioned in the cavity, the sprayer is provided with a liquid outlet hole which is horizontally upward and used for spraying carbon dioxide liquid drops; the gas-phase carbon dioxide outlet is arranged at the top of the cavity; the dry ice outlet is arranged at the bottom of the cavity. The utility model can process carbon dioxide gas with different concentrations to prepare dry ice with higher density and purity, thus reducing the storage and transportation cost; the use of the dry ice generator and the carbon dioxide trapping system can avoid the use of expensive chemical absorbent, thereby reducing the trapping cost; the process of condensing into liquid and then spraying and granulating to form dry ice can realize continuous operation in engineering, and is beneficial to large-scale production.
Description
Technical Field
The utility model relates to a chemical industry, environmental protection field, concretely relates to dry ice generator and carbon dioxide entrapment system.
Background
Carbon dioxide capture, utilization and sequestration (CCUS) refers to a technical means for capturing and separating carbon dioxide from emission sources such as energy utilization and industrial processes or air, conveying the carbon dioxide to a proper place through a tank truck, a pipeline, a ship and the like for utilization or sequestration, and finally realizing carbon dioxide emission reduction.
At present, aiming at the industries, the main post-combustion capture technology at home and abroad is a chemical absorption method, but a chemical absorbent is expensive, so that the application of the carbon capture technology is restricted. Therefore, from the viewpoint of reducing the trapping cost, it is necessary to develop a process using a physical trapping method.
Carbon dioxide can be maintained in a solid state at 195K under 1 atm based on the phase diagram of carbon dioxide, but at least 68 atm is required to maintain carbon dioxide in a liquid state at normal temperature. Therefore, the carbon dioxide is captured in a solid state, and the storage and transportation of the carbon dioxide are more facilitated.
If the carbon dioxide is directly condensed into the dry ice in a pipeline heat exchange mode, the cooling temperature is required to be low, the dry ice is directly condensed into solid on the heat transfer surface to influence the heat transfer effect, the dry ice is difficult to remove from the heat transfer wall surface, large-scale continuous production is difficult to carry out in engineering, and the trapping scale is restricted.
Therefore, a carbon dioxide capturing device and a carbon dioxide capturing system which adopt a pure physical means, avoid the direct solidification of carbon dioxide on the heat transfer wall surface, have high purity of the prepared dry ice and are suitable for large-scale industrial continuous production are urgently needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that the defect that carbon dioxide industrial waste gas and dry ice can not be treated in the prior art, the dry ice is directly solidified on the heat transfer wall surface and is difficult to continuously produce the dry ice on a large scale is overcome, and a dry ice generator and a carbon dioxide trapping system are provided. The utility model can process carbon dioxide gas with different concentrations, produce dry ice with higher density and purity, and reduce the storage and transportation cost; in addition, the use of the dry ice generator and the carbon dioxide trapping system of the utility model can avoid the use of expensive chemical absorbent, thereby reducing the trapping cost; in addition, the process of condensing into liquid and then spraying and granulating to form dry ice can realize continuous operation in engineering, and is beneficial to large-scale production.
The utility model discloses a following technical scheme solves above-mentioned technical problem.
The utility model provides a dry ice generator, which comprises a cavity, a feeding pipeline, a gas phase carbon dioxide outlet and a dry ice outlet; wherein the content of the first and second substances,
the feeding pipeline horizontally penetrates through the wall surface of the cavity, one end of the feeding pipeline is a liquid-phase carbon dioxide inlet, a sprayer is arranged on the feeding pipeline positioned in the cavity, and is provided with a liquid outlet hole which is horizontally upward and used for spraying carbon dioxide liquid drops; the ratio of the distance from the feeding pipeline to the top of the cavity to the distance from the sprayer to the bottom of the cavity is 1: (2-30);
the gas-phase carbon dioxide outlet is arranged at the top of the cavity;
the dry ice outlet is arranged at the bottom of the cavity.
In the utility model discloses, the bottom of cavity is preferred to have wide structure narrow down. The bottom of the cavity can be used for rapidly collecting dry ice, so that carbon dioxide is prevented from continuously sublimating, and the energy consumption is reduced.
The utility model discloses in, the charge-in pipeline extremely the distance at the top of cavity with the spray thrower extremely the preferred 1 of ratio of the distance of the bottom of cavity: (2.6-24).
In the utility model, the distance from the feeding pipeline to the top of the cavity is preferably 0.5-1.5m.
In the utility model discloses in, the feed line extremely the distance of the bottom of cavity is preferably 4-12m for the carbon dioxide liquid drop has sufficient whereabouts space, turns into solid-state and gaseous state completely at the in-process of whereabouts.
The utility model discloses in, it is preferred, be located in the cavity charge-in pipeline be equipped with a plurality of with the crisscross vertically branch road of charge-in pipeline, each parallel and the equidistance of branch road set up in the same cross section of dry ice generator's cavity, be equipped with on the road the spray thrower. The arrangement mode aims to ensure that the spraying range of all the sprayers can completely cover the cross section of the whole cavity, fully utilizes the cross section area of the cavity and increases the spraying range.
Wherein, the distance between adjacent sprayers on the same branch is preferably 0.2-0.8m.
Wherein, the aperture of the liquid outlet hole is preferably 1-6mm.
The utility model discloses in, the quantity of sprayer can be based on branch road quantity on the cross section of cavity is decided.
The utility model provides a carbon dioxide capture system, which comprises a first heat exchanger, a drying tower, a first compressor, a second heat exchanger, a third heat exchanger, a buffer tank and the dry ice generator;
the first heat exchanger is provided with a heat medium channel inlet and a heat medium channel outlet which are connected with the raw material inlet;
the outlet of the heat medium channel of the first heat exchanger is sequentially connected with the drying tower and the first compressor;
the first compressor is connected with the inlet of the heat medium channel of the second heat exchanger;
the outlet of the heat medium channel of the second heat exchanger is connected with the inlet of the heat medium channel of the third heat exchanger;
the third heat exchanger is provided with two heat medium channel outlets, wherein one heat medium channel outlet is sequentially connected with the buffer tank and the dry ice generator, and the other heat medium channel outlet is sequentially connected with the cold medium channel of the second heat exchanger and the cold medium channel of the first heat exchanger.
The utility model discloses in, first heat exchanger with the drying tower is preferred all to be equipped with a condensate outlet.
In the utility model, a loop is preferably arranged between the buffer tank and the dry ice generator; wherein the loop is sequentially connected with the dry ice generator, the second compressor, the fourth heat exchanger and the buffer tank.
Preferably, the first heat exchanger, the second heat exchanger, the third heat exchanger and the fourth heat exchanger are all tube type heat exchangers. The tubular heat exchanger mainly comprises a shell, a tube plate, a heat exchange tube, a seal head, a baffle plate and the like, and the required materials can respectively adopt common carbon steel, red copper, or stainless steel, titanium and the like. When heat exchange is carried out, materials enter from the connecting pipe of the end socket and flow in the pipe, and flow out from the outlet pipe at the other end of the end socket, which is called a pipe pass; the other fluid enters from a connecting pipe of the shell and flows out from the other connecting pipe on the shell, and the other fluid is called shell side. During operation, hot streams enter from the shell side to reduce energy consumption.
The cold energy of the third heat exchanger and the cold energy of the fourth heat exchanger are both the cold energy which is conventional in the field, and the cold energy is provided by the outside.
Wherein, the first compressor and the second compressor are conventional compressors in the field, and can be selected according to the gas treatment capacity and the gas compression requirement.
On the basis of the common knowledge in the field, the above preferred conditions can be combined at will to obtain the preferred embodiments of the present invention.
The utility model discloses an actively advance the effect and lie in:
1. the dry ice generator of the present application may convert liquid carbon dioxide into dry ice. The dry ice only needs to be stored at low temperature and does not need to be stored in a high-pressure environment, so that the use of steel cylinders and the like is avoided, and the storage and transportation cost is greatly reduced. Meanwhile, compared with liquid carbon dioxide, the dry ice has richer use scenes, can be directly sublimated into gaseous carbon dioxide, and is convenient to use.
2. The carbon dioxide liquid drop with the diameter of 1-5mm can be obtained by the dry ice generator, so that granular dry ice is obtained, snowflake-shaped dry ice is prevented from being prepared, and the density of the dry ice is improved.
3. The carbon dioxide capture system can avoid using expensive chemical absorbent, and reduces capture cost. The carbon dioxide in the flue gas is liquefied and separated by pure physical methods such as temperature reduction, pressure increase, drying and the like, and is solidified into dry ice, the process does not involve any chemical reaction, and the use of a chemical absorbent is avoided.
4. The carbon dioxide trapping system avoids the direct condensation of carbon dioxide to the dry ice on the heat transfer surface, thereby influencing the heat transfer effect and increasing the cleaning difficulty, and the continuous operation can be realized in engineering through the process of condensing into liquid and then spraying and granulating to form the dry ice, and the large-scale production is facilitated.
5. The carbon dioxide capture system is designed for capturing industrial carbon instead of pure carbon dioxide for preparing dry ice, the feed gas can be carbon dioxide industrial waste gas which possibly contains complex components such as oxysulfide, nitric oxide, nitrogen, oxygen, water vapor and the like, and the carbon dioxide capture system can be operated near a carbon dioxide triple point (-57 ℃ and 0.52 MPa), so that the condition that other gases are condensed together to cause impure carbon dioxide products is avoided.
Drawings
Fig. 1 is a schematic structural view of a dry ice generator of embodiment 1.
Fig. 2 is a schematic cross-sectional view of the chamber of example 1.
FIG. 3 is a diagram of a carbon dioxide capture system of example 2.
Reference numerals:
1-a first shell and tube heat exchanger; 2-a drying tower; 3-a first compressor; 4-a second shell and tube heat exchanger; 5-a third row of tubular heat exchangers; 6-a buffer tank; 7-a dry ice generator; 8-a second compressor; 9-a fourth shell and tube heat exchanger; 700-a cavity; 701-a liquid phase carbon dioxide inlet; 702-a feed conduit; 703-a sprayer; 704 — a gas phase carbon dioxide outlet; 705-dry ice outlet; 706-branch.
Detailed Description
The principles and features of the present invention will be described with reference to the drawings, which are provided for illustration only and are not intended to limit the scope of the invention.
Example 1
Fig. 1 is a schematic structural view of the dry ice generator of this embodiment.
Fig. 2 is a schematic cross-sectional view of a cavity in the dry ice generator according to the present embodiment.
As shown in fig. 1, the dry ice generator 7 includes a cavity 700, a liquid phase carbon dioxide inlet 701, a feed conduit 702, a gaseous carbon dioxide outlet 704, and a dry ice outlet 705; a feed pipe 702 horizontally penetrates through the wall surface of the cavity 700, one end of the feed pipe 702 is provided with a liquid-phase carbon dioxide inlet 701, the feed pipe 702 positioned in the cavity 700 is provided with a plurality of branch circuits 706 which are perpendicular to the feed pipe 702 in a staggered manner, each branch circuit 706 is arranged on the same cross section of the cavity 700 of the dry ice generator in parallel and at equal intervals, a sprayer 703 is arranged on each branch circuit 706, and the sprayer 703 is provided with a liquid outlet hole which is horizontally upward and used for spraying carbon dioxide liquid drops; the distance from the feed conduit 702 to the top of the chamber 700 is 0.5-1.5m; the distance from the feed conduit 702 to the bottom of the chamber 700 is 4-12m; the distance between adjacent sprayers 703 on the same branch is 0.2-0.8m; the aperture of the liquid outlet hole is 1-6mm; a gas-phase carbon dioxide outlet 704 is arranged at the top of the cavity 700; a dry ice outlet 705 is arranged at the bottom of the cavity 700; the bottom of the cavity 700 has a structure that is wide at the top and narrow at the bottom.
Example 2
Fig. 3 is a diagram of a carbon dioxide capture system of example 2.
As shown in fig. 3, the carbon dioxide capturing system includes a first tubular heat exchanger 1, a drying tower 2, a first compressor 3, a second tubular heat exchanger 4, a third tubular heat exchanger 5, a buffer tank 6, and a dry ice generator 7; the first tubular heat exchanger 1 is provided with a heat medium channel inlet and a heat medium channel outlet which are connected with the raw material inlet; the outlet of a heat medium channel of the first tubular heat exchanger 1 is sequentially connected with the drying tower 2 and the first compressor 3; the first tubular heat exchanger 1 and the drying tower 2 are both provided with a condensate outlet; the first compressor 3 is connected with the inlet of the heat medium channel of the second shell and tube heat exchanger 4; the outlet of the heat medium channel of the second tubular heat exchanger 4 is connected with the inlet of the heat medium channel of the third tubular heat exchanger 5; the third tubular heat exchanger 5 is provided with two heat medium channel outlets, wherein one heat medium channel outlet is sequentially connected with the buffer tank 6 and the dry ice generator 7, and the other heat medium channel outlet is sequentially connected with the cold medium channel of the second tubular heat exchanger 4 and the cold medium channel of the first tubular heat exchanger 1; a loop is arranged between the buffer tank 6 and the dry ice generator 7, the second compressor 8, the fourth tubular heat exchanger 9 and the buffer tank 6 are sequentially connected; the cooling capacity of the third tubular heat exchanger 5 and the fourth tubular heat exchanger 9 is provided by the outside.
Example 3
Hot flue gas enters from the shell side of a first tubular heat exchanger 1, is cooled in the first tubular heat exchanger 1, water vapor in the flue gas is condensed into liquid and is discharged from a condensate outlet of the shell side, the dehumidified flue gas enters a drying tower 2 to completely remove residual moisture, then the flue gas enters a first compressor 3 for compression and pressurization, enters a second tubular heat exchanger 4 for precooling in the shell side, then enters the shell side of a third tubular heat exchanger 5 for cooling by the input cold energy, carbon dioxide in the flue gas is condensed, the condensed liquid carbon dioxide is discharged into a buffer tank 6, and the residual non-condensable nitrogen-rich tail gas enters a second tubular heat exchanger 4 and the first tubular heat exchanger 1 in sequence after being discharged from the third tubular heat exchanger 5, and is discharged out of the system after the cold energy in the tail gas is recovered. The liquid carbon dioxide discharged into the buffer tank 6 from the third tubular heat exchanger 5 enters the dry ice generator 7 from the liquid carbon dioxide inlet 701 in the state near the triple point, is sprayed into carbon dioxide liquid drops with the diameter of 1-5mm from bottom to top through the sprayer 703 in a decompression mode, part of the liquid carbon dioxide in the carbon dioxide liquid drops is rapidly gasified and absorbs heat due to pressure reduction in the motion process, the temperature of the rest liquid carbon dioxide drops and is solidified into granular dry ice, the granular dry ice falls to the bottom of the dry ice generator 7 and is discharged from the dry ice outlet 705, the gasified gaseous carbon dioxide is discharged from the gas carbon dioxide outlet 704 and enters the shell pass of the fourth tubular heat exchanger 9 through the second compressor 8, the input cold energy is liquefied into the liquid carbon dioxide again, and the liquid carbon dioxide enters the buffer tank 6 to be mixed with the liquid carbon dioxide and then enters the dry ice generator 7 again to form circulation.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A dry ice generator is characterized by comprising a cavity, a feeding pipeline, a gas-phase carbon dioxide outlet and a dry ice outlet; wherein the content of the first and second substances,
the feeding pipeline horizontally penetrates through the wall surface of the cavity, one end of the feeding pipeline is a liquid-phase carbon dioxide inlet, a sprayer is arranged on the feeding pipeline positioned in the cavity, the sprayer is provided with a liquid outlet hole which is horizontally upward and used for spraying liquid drops of carbon dioxide; the ratio of the distance from the feeding pipeline to the top of the cavity to the distance from the sprayer to the bottom of the cavity is 1: (2-30);
the gas-phase carbon dioxide outlet is arranged at the top of the cavity;
the dry ice outlet is arranged at the bottom of the cavity.
2. A dry ice generator as claimed in claim 1, wherein the bottom of the cavity has a configuration that is wide at the top and narrow at the bottom.
3. A dry ice generator as claimed in claim 1, wherein the ratio of the distance of the feed conduit to the top of the cavity to the distance of the sprayer to the bottom of the cavity is 1: (2.6-24).
4. A dry ice generator as claimed in claim 1, wherein the feed conduit is spaced from 0.5 to 1.5m from the top of the cavity;
the distance from the feeding pipeline to the bottom of the cavity is 4-12m.
5. A dry ice generator as claimed in claim 1, wherein the feed conduit within the cavity is provided with a plurality of branches perpendicular to the feed conduit in a staggered relationship, each branch being disposed parallel and equidistant to a same cross-section of the cavity of the dry ice generator, the branches being provided with the sprinklers.
6. A dry ice generator as claimed in claim 5, wherein the spacing between adjacent sprinklers on the same branch is 0.2-0.8m;
the aperture of the liquid outlet hole is 1-6mm.
7. A carbon dioxide capture system comprising a first heat exchanger, a drying tower, a first compressor, a second heat exchanger, a third heat exchanger, a surge tank, and a dry ice generator as claimed in any one of claims 1 to 6;
the first heat exchanger is provided with a heat medium channel inlet and a heat medium channel outlet which are connected with the raw material inlet;
the outlet of the heat medium channel of the first heat exchanger is sequentially connected with the drying tower and the first compressor;
the first compressor is connected with the inlet of the heat medium channel of the second heat exchanger;
the outlet of the heat medium channel of the second heat exchanger is connected with the inlet of the heat medium channel of the third heat exchanger;
the third heat exchanger is provided with two heat medium channel outlets, wherein one heat medium channel outlet is sequentially connected with the buffer tank and the dry ice generator, and the other heat medium channel outlet is sequentially connected with the cold medium channel of the second heat exchanger and the cold medium channel of the first heat exchanger.
8. The carbon dioxide capture system of claim 7, wherein the first heat exchanger and the drying column each have a condensate outlet.
9. The carbon dioxide capture system of claim 7, wherein a circuit is provided between the buffer tank and the dry ice generator;
wherein the loop is sequentially connected with the dry ice generator, the second compressor, the fourth heat exchanger and the buffer tank.
10. The carbon dioxide capture system of claim 9, wherein the first heat exchanger, the second heat exchanger, the third heat exchanger, and the fourth heat exchanger are all shell and tube heat exchangers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221067882.XU CN217686022U (en) | 2022-05-06 | 2022-05-06 | Dry ice generator and carbon dioxide capture system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221067882.XU CN217686022U (en) | 2022-05-06 | 2022-05-06 | Dry ice generator and carbon dioxide capture system |
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| Publication Number | Publication Date |
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| CN217686022U true CN217686022U (en) | 2022-10-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221067882.XU Active CN217686022U (en) | 2022-05-06 | 2022-05-06 | Dry ice generator and carbon dioxide capture system |
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| CN (1) | CN217686022U (en) |
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- 2022-05-06 CN CN202221067882.XU patent/CN217686022U/en active Active
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