Carbon dioxide liquefaction device based on LNG cold energy
By using LNG cold energy to exchange heat with carbon dioxide gas and propane as a medium, the high energy consumption problem in the carbon dioxide liquefaction process was solved, achieving low-temperature liquefaction and high-efficiency production, reducing energy consumption and water consumption, and improving the stability of the unit and gas quality.
Patent Information
- Application Number
- CN202520169806.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-24
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2035-01-24
AI Technical Summary
The existing carbon dioxide liquefaction process is energy-intensive, has a long cooling time, and consumes a large amount of electricity and water resources.
A carbon dioxide liquefaction device based on LNG cold energy is adopted. By setting up a first-stage and second-stage heat exchanger housing, an air compressor and carbon dioxide gas supply pipes, the device uses LNG cold energy to exchange heat with carbon dioxide gas, and combines propane as an intermediate cooling medium to achieve low-temperature liquefaction of carbon dioxide.
It significantly reduces the load on refrigeration equipment, lowers energy consumption, avoids water consumption, improves liquefaction efficiency, ensures stable operation of the unit, and improves gas quality through a carbon dioxide deoxygenation purifier.
Smart Images
Figure CN223726734U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to carbon dioxide liquefaction technical field, concretely is a kind of carbon dioxide liquefaction device based on LNG cold energy. BACKGROUND
[0002] Liquid carbon dioxide and dry ice (i.e. solid carbon dioxide) are often used for fire extinguishing, long-distance transportation and preservation. Liquid carbon dioxide is compressed by compressor and then cooled by cooler to achieve liquefaction. Dry ice (i.e. solid carbon dioxide) is forcedly cooled and rapidly depressurized to solidify into dry ice. It can be seen that both liquid carbon dioxide and dry ice need to be processed and handled by liquefying gaseous carbon dioxide.
[0003] At present, carbon dioxide is compressed to 2.5-3.0 MPaG and then cooled and liquefied by refrigeration equipment to obtain liquid carbon dioxide. The equipment used in the liquefaction process is carbon dioxide refrigerator, which cools high-temperature gas into liquid by cooling water. Although it can achieve refrigeration and liquefaction, the pressure of compressed carbon dioxide gas is high, which requires a large amount of cooling water and a long cooling time, increases the load of the refrigerator, consumes more electric energy and water resources, and leads to high energy consumption in the refrigeration process.
[0004] Therefore, it is necessary to provide a new carbon dioxide liquefaction device to solve the problem of high energy consumption in the refrigeration process. SUMMARY
[0005] The utility model aims at providing a carbon dioxide liquefaction device based on LNG cold energy to solve the problem of high energy consumption in the carbon dioxide refrigeration process.
[0006] The utility model sets first stage heat exchange machine shell, second stage heat exchange machine shell, air compressor and carbon dioxide gas supply pipe piece, carries out heat exchange between LNG cold energy and carbon dioxide gas, so as to provide the required low temperature for carbon dioxide liquefaction by LNG cold energy, and the load of refrigeration equipment is greatly reduced, and energy consumption is reduced.
[0007] To achieve the above object, the utility model provides the following technical scheme:
[0008] A carbon dioxide liquefaction device based on LNG cold energy, comprising a first stage heat exchange machine shell, a second stage heat exchange machine shell, an air compressor and a carbon dioxide gas supply pipe piece.
[0009] The inside of the first-stage heat exchange shell is provided with a heat exchange inner cavity, and a heat exchange pipe group is fixed in the heat exchange inner cavity; LNG introduction pipe fittings and LNG discharge pipe fittings in communication with the LNG introduction pipe fittings are respectively arranged on the heat exchange pipe group, and propane introduction pipe fittings and propane discharge pipe fittings are respectively arranged on the heat exchange inner cavity;
[0010] The inside of the second-stage heat exchange shell is fixed with outer corrugated heat exchange pipes, and inner heat exchange pipes are fixed in the outer corrugated heat exchange pipes; purified carbon dioxide introduction pipe fittings and liquefied carbon dioxide discharge pipe fittings are respectively arranged on the inner heat exchange pipes, and cooling propane supply pipe fittings and propane recovery pipe fittings are respectively arranged on the outer corrugated heat exchange pipes; the air compressor is in communication with the carbon dioxide gas supply pipe fittings, the purified carbon dioxide introduction pipe fittings and the liquefied carbon dioxide discharge pipe fittings in sequence; the propane introduction pipe fittings are in communication with the propane discharge pipe fittings, the cooling propane supply pipe fittings and the propane recovery pipe fittings in sequence.
[0011] It is further limited that the carbon dioxide liquefaction device based on LNG cold energy further comprises an LNG recovery tank and an LNG feeding tank; the LNG feeding tank is in communication with the LNG introduction pipe fittings; and the LNG recovery tank is in communication with the LNG discharge pipe fittings.
[0012] It is further limited that the carbon dioxide liquefaction device based on LNG cold energy further comprises a propane feeding tank and a propane recovery tank; the propane feeding tank is in communication with the propane introduction pipe fittings; and the propane recovery tank is in communication with the propane recovery pipe fittings.
[0013] It is further limited that the carbon dioxide liquefaction device based on LNG cold energy further comprises a liquefied carbon dioxide collection bottle in communication with the liquefied carbon dioxide discharge pipe fittings.
[0014] It is further limited that the carbon dioxide liquefaction device based on LNG cold energy further comprises a carbon dioxide deoxygenation purifier between the carbon dioxide gas supply pipe fittings and the air compressor.
[0015] It is further limited that an air pressure gauge is installed on the air compressor.
[0016] It is further limited that the carbon dioxide liquefaction device based on LNG cold energy further comprises a rack, and the propane feeding tank, the LNG recovery tank, the LNG feeding tank, the liquefied carbon dioxide collection bottle, the second-stage heat exchange shell, the propane recovery tank, the first-stage heat exchange shell, the air compressor and the carbon dioxide deoxygenation purifier are detachably installed on the rack.
[0017] It is further limited that rubber heat insulation layers are arranged on the outer side walls of the first-stage heat exchange shell and the second-stage heat exchange shell.
[0018] It is further limited that temperature and humidity sensors are arranged on the inner walls of the first-stage heat exchange shell and the second-stage heat exchange shell.
[0019] Compared with the prior art, the utility model has the advantages of:
[0020] 1、 the utility model discloses a first -level heat exchange casing, second -level heat exchange casing, air compressor and carbon dioxide gas supply pipe spare are set up, and the heat exchange is carried out to LNG cold energy and carbon dioxide gas, thereby utilize LNG cold energy to provide required low temperature for carbon dioxide liquefaction, and the load of refrigeration equipment is greatly reduced, and the consumption of electric energy and water resources is reduced, and energy consumption is greatly reduced.
[0021] 2、 in the utility model, the first -level heat exchange casing and second -level heat exchange casing are set up, in the first -level heat exchange casing, utilize LNG cold energy to cool propane, and the propane after temperature rise is recycled, and the propane after temperature reduction continues to enter the second -level heat exchange casing and carries out the heat exchange with carbon dioxide gas, realizes the liquefaction of carbon dioxide, adopts propane as intermediate cooling medium, can directly utilize the icing problem that LNG cold energy cooling brings, not only improves carbon dioxide liquefaction effect, and ensures the stable operation of device.
[0022] 3、 the utility model discloses setting up carbon dioxide deoxygenation purifier between carbon dioxide gas supply pipe spare and air compressor, carries out purification reaction to the carbon dioxide gas after liquefaction of compressed, thereby removes oxygen impurity in carbon dioxide gas, improves the quality of carbon dioxide gas after liquefaction, on one hand can avoid oxygen impurity into equipment interior and cause oxidation damage to equipment, on the other hand avoids oxygen impurity into liquid carbon dioxide and causes product pollution.
[0023] 4、 the utility model discloses integrating each equipment on rack, saves space, is convenient for the monitoring of equipment operation condition, reduces equipment maintenance cost, also is convenient for the connection and operation between equipment, improves production efficiency.
[0024] 5、 the utility model discloses the cooling liquefaction of carbon dioxide is realized to LNG cold energy, not only avoids the consumption of water resources, reduces cooling time, and can fully realize the recycling of LNG cold energy, and energy saving and consumption reduction. DETAILED DESCRIPTION
[0025] Figure 1 It is the front view structural schematic drawing of the utility model;
[0026] Figure 2 It is the side view structural schematic drawing of the utility model;
[0027] Figure 3 It is the first -level heat exchange casing split state front view partial section structural schematic drawing of the utility model;
[0028] Figure 4 It is the second -level heat exchange casing split state front view partial section structural schematic drawing of the utility model;
[0029] Figure 5 It is the front view structural schematic diagram of carbon dioxide deoxidation purifier of the utility model;
[0030] In the drawing,
[0031] 1, propane feeding tank; 2, LNG recovery tank; 3, LNG feeding tank; 4, rack; 5, liquefied carbon dioxide collection bottle; 6, second-stage heat exchange shell; 7, temperature and humidity sensor; 8, propane recovery tank; 9, first-stage heat exchange shell; 10, air compressor; 11, carbon dioxide deoxidation purifier; 12, PLC controller; 13, LNG discharge pipe fitting; 14, LNG introduction pipe fitting; 15, propane discharge pipe fitting; 16, heat exchange pipe group; 17, heat exchange inner cavity; 18, propane introduction pipe fitting; 19, flange plate; 20, inner heat exchange pipe; 21, cooling propane supply pipe fitting; 22, outer corrugated heat exchange pipe; 23, propane recovery pipe fitting; 24, liquefied carbon dioxide discharge pipe fitting; 25, purified carbon dioxide introduction pipe fitting; 26, air pressure gauge; 27, micro electric pump; 28, carbon dioxide gas supply pipe fitting. DETAILED DESCRIPTION
[0032] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.
[0033] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, they indicate the presence of a feature, step, work, device, component and / or their combination.
[0034] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.
[0035] EMBODIMENT
[0036] Referring to Figures 1-5The LNG cold energy based carbon dioxide liquefying device provided by the embodiment comprises a first-stage heat exchange shell 9, a second-stage heat exchange shell 6, an air compressor 10 and a carbon dioxide gas supply pipe 28.
[0037] In the embodiment, the first-stage heat exchange shell 9 is internally provided with a heat exchange cavity 17, and the heat exchange cavity 17 is internally fixed with a heat exchange pipe group 16; the heat exchange pipe group 16 is respectively provided with an LNG inlet pipe 14 and an LNG outlet pipe 13 communicated with the LNG inlet pipe 14, and the heat exchange cavity 17 is respectively provided with a propane outlet pipe 15 and a propane inlet pipe 18.
[0038] In the implementation, the LNG inlet pipe 14 is communicated with the LNG outlet pipe 13 in which LNG containing cold energy flows, and the propane inlet pipe 18 and the propane outlet pipe 15 in which propane flows; heat exchange between the LNG and the propane is realized in the flow, the cold energy of the LNG is replaced by the propane, the propane is cooled, and the LNG is warmed to become normal temperature natural gas. In order to improve the heat exchange effect, the flow direction of the LNG is opposite to that of the propane, that is, the LNG and the propane flow reversely. Preferably, the LNG inlet pipe 14 is located at the lower left, the LNG outlet pipe 13 is located at the upper left, the LNG flows from the lower left to the upper right, the propane inlet pipe 18 is located at the upper right, and the propane outlet pipe 15 is located at the lower left, that is, the propane flows from the upper right to the lower left, so that the cold energy of the LNG is greatly replaced by the propane, and the heat exchange efficiency and the cold energy utilization rate are improved.
[0039] Preferably, the heat exchange pipe group 16 is connected by a plurality of U-shaped heat exchange pipes, and the plurality of U-shaped heat exchange pipes are distributed in the heat exchange cavity 17 from top to bottom; one end of each U-shaped heat exchange pipe is communicated with the LNG inlet pipe 14, and the other end is communicated with the LNG outlet pipe 13. Threaded layers are arranged on the outer side wall and the inner side wall of the U-shaped heat exchange pipe, so as to facilitate the connection and installation between the U-shaped heat exchange pipes.
[0040] In the embodiment, the second-stage heat exchange shell 6 is internally fixed with an outer corrugated heat exchange pipe 22, the inner heat exchange pipe 20 is fixed in the inner corrugated heat exchange pipe 22, the inner heat exchange pipe 20 is respectively provided with a purified carbon dioxide inlet pipe 25 and a liquefied carbon dioxide outlet pipe 24, the outer corrugated heat exchange pipe 22 is respectively provided with a cooling propane supply pipe 21 and a propane recovery pipe 23; the air compressor 10 is communicated with the carbon dioxide gas supply pipe 28, the purified carbon dioxide inlet pipe 25 and the liquefied carbon dioxide outlet pipe 24 in sequence; the propane inlet pipe 18 is communicated with the propane outlet pipe 15, the cooling propane supply pipe 21 and the propane recovery pipe 23 in sequence.
[0041] In implementation, carbon dioxide flowing in the carbon dioxide purification inlet pipe 25 and the liquefied carbon dioxide outlet pipe 24, and the cooled propane flowing in the cooled propane supply pipe 21 and the propane recovery pipe 23, realize heat exchange between the carbon dioxide gas and the cooled propane in the flowing process, and the cold energy of the cooled propane is replaced to the carbon dioxide gas, realizing cooling and liquefaction of the carbon dioxide gas.
[0042] In the embodiment, the outer wall of the first-stage heat exchange shell 9 and the outer wall of the second-stage heat exchange shell 6 are both provided with rubber heat insulation layers, which play a role of heat insulation and heat preservation, and improve the heat exchange efficiency.
[0043] In the embodiment, the inner wall of the first-stage heat exchange shell 9 and the inner wall of the second-stage heat exchange shell 6 are both provided with the temperature and humidity sensor 7, which monitors the humidity and temperature of the materials in the first-stage heat exchange shell 9 and the second-stage heat exchange shell 6, and provides data support for the operation of the device.
[0044] The LNG recovery tank 2 and the LNG feeding tank 3 are further included in the LNG cold energy based carbon dioxide liquefaction device provided in the embodiment, the LNG feeding tank 3 is in communication with the LNG inlet pipe 14, and the LNG recovery tank 2 is in communication with the LNG outlet pipe 13.
[0045] The LNG cold energy based carbon dioxide liquefaction device provided in the embodiment further includes the propane feeding tank 1 and the propane recovery tank 8, the propane feeding tank 1 is in communication with the propane inlet pipe 18, and the propane recovery tank 8 is in communication with the propane recovery pipe 23.
[0046] The LNG cold energy based carbon dioxide liquefaction device provided in the embodiment further includes the liquefied carbon dioxide collection bottle 5 in communication with the liquefied carbon dioxide outlet pipe 24.
[0047] Preferably, a threaded connection is formed between the liquefied carbon dioxide collection bottle 5 and the liquefied carbon dioxide outlet pipe 24. The material of the liquefied carbon dioxide collection bottle 5 is tempered glass.
[0048] The LNG cold energy based carbon dioxide liquefaction device provided in the embodiment further includes the carbon dioxide deoxidization purifier 11 between the carbon dioxide gas supply pipe 28 and the air compressor 10.
[0049] In use, the carbon dioxide gas to be liquefied is introduced into the air compressor 10 for compression treatment, and then enters the carbon dioxide deoxidization purifier 11 for purification reaction, which improves the gas processing quality, avoids the oxygen impurities in the carbon dioxide gas from entering the processing equipment to cause pollution and oxidation damage, and improves the processing effect of the device.
[0050] In the embodiment, the air pressure gauge 26 is installed on the air compressor 10, which is used for monitoring the working pressure of the air compressor 10.
[0051] The LNG cold energy based carbon dioxide liquefaction device provided by the embodiment further comprises a rack 4, and the propane feeding tank 1, the LNG recovery tank 2, the LNG feeding tank 3, the liquefied carbon dioxide collecting bottle 5, the second-stage heat exchange shell 6, the propane recovery tank 8, the first-stage heat exchange shell 9, the air compressor 10 and the carbon dioxide deoxidization purifier 11 are detachably installed on the rack 4, so that the device has the advantages of split type and is convenient to disassemble and maintain.
[0052] Preferably, the detachable installation is a screw or bolt dismounting structure, which is convenient to dismount.
[0053] Preferably, in order to facilitate the connection of the pipelines, flanges 19 are arranged on the LNG discharge pipe fitting 13, the LNG guide-in pipe fitting 14, the propane guide-out pipe fitting 15, the propane guide-in pipe fitting 18, the cooling propane supply pipe fitting 21, the propane recovery pipe fitting 23, the liquefied carbon dioxide guide-out pipe fitting 24, the purified carbon dioxide guide-in pipe fitting 25 and the carbon dioxide gas supply pipe fitting 28, and the pipelines are connected through the flanges 19, which is practical and convenient.
[0054] Preferably, micro electric pumps 27 are installed on the propane feeding tank 1, the LNG recovery tank 2, the LNG feeding tank 3, the propane recovery tank 8, the propane guide-out pipe fitting 15, the liquefied carbon dioxide guide-out pipe fitting 24 and the carbon dioxide gas supply pipe fitting 28, that is, seven micro electric pumps 27 are installed. Specifically, the propane feeding tank 1 is connected with the propane guide-in pipe fitting 18 through the micro electric pump 27; the propane recovery tank 8 is connected with the propane recovery pipe fitting 23 through the micro electric pump 27; the LNG recovery tank 2 is connected with the LNG discharge pipe fitting 13 through the micro electric pump 27; the LNG feeding tank 3 is connected with the LNG guide-in pipe fitting 14 through the micro electric pump 27; the propane guide-out pipe fitting 15 is connected with the cooling propane supply pipe fitting 21 through the micro electric pump 27, the carbon dioxide gas supply pipe fitting 28 is connected with the purified carbon dioxide guide-in pipe fitting 25 through the micro electric pump 27; and the liquefied carbon dioxide guide-out pipe fitting 24 is connected with the liquefied carbon dioxide collecting bottle 5 through the micro electric pump 27. The seven micro electric pumps 27 are used to control the LNG, the propane and the carbon dioxide respectively.
[0055] Preferably, a PLC controller 12 is installed on the rack 4, and the PLC controller 12 is electrically connected with the seven micro electric pumps 27 to control the opening and closing of the seven micro electric pumps 27, that is, the conduction and closing of the pipelines.
[0056] Preferably, the PLC controller 12 is further connected with the air compressor 10 to control the start and stop of the air compressor 10.
[0057] The LNG cold energy based carbon dioxide liquefaction device provided by the embodiment is used as follows:
[0058] The carbon dioxide gas to be liquefied is introduced into the air compressor 10 for compression treatment, and then introduced into the carbon dioxide deoxidizing purifier 11 for purification reaction, so as to remove the oxygen impurities in the carbon dioxide gas, thereby improving the quality of the gas and avoiding the pollution and oxidation damage caused by the oxygen impurities in the carbon dioxide gas entering the processing equipment.
[0059] Further, the two-stage heat exchange mechanism, i.e., the first-stage heat exchange shell 9 and the second-stage heat exchange shell 6, is arranged. The first-stage heat exchange is performed in the first-stage heat exchange shell 9, mainly by the heat exchange between the LNG and the propane, and the propane absorbs the cold energy of the LNG to be cooled. The second-stage heat exchange is performed in the second-stage heat exchange shell 6, mainly by the heat exchange between the cooled propane after the first-stage heat exchange and the carbon dioxide gas, so as to realize the liquefaction of the carbon dioxide gas. Specifically, on one hand, the LNG feeding tank 3 will uniformly and actively introduce the LNG providing cold energy into the inside of the heat exchange pipe group 16 through the corresponding micro electric pump 27, which will realize the heat exchange treatment with the propane gas introduced into the heat exchange inner cavity 17 through the micro electric pump 27 on the propane feeding tank 1, so as to replace the cold energy of the LNG to the propane. On the other hand, the purified carbon dioxide gas will be actively and efficiently sent into the inner heat exchange pipe 20 in the second-stage heat exchange shell 6 through the micro electric pump 27 on the carbon dioxide gas supply pipe 28, at the same time, the intermediate medium propane, which replaces the cold energy of the LNG out of the first-stage heat exchange shell 9 through the heat exchange, will enter the inside of the outer corrugated heat exchange pipe 22 through the cooled propane supply pipe 21, and then can realize the heat exchange with the carbon dioxide through the contact heat exchange between the outer corrugated heat exchange pipe 22 and the inner heat exchange pipe 20, so as to realize the liquefaction and cooling of the carbon dioxide. The propane is used as the intermediate medium, and the two-stage heat exchange structure is adopted, so as to avoid the icing problem caused by the direct liquefaction of the carbon dioxide gas by using the cold energy of the LNG, optimize the carbon dioxide liquefaction treatment effect, and at the same time, the LNG product completing the cold energy replacement can be automatically recovered through the LNG discharge pipe 13, the micro electric pump 27 and the LNG recovery tank 2. The intermediate medium propane completing the twice heat exchange can be automatically recovered through the propane recovery pipe 23, the micro electric pump 27 and the propane recovery tank 8. The liquefied carbon dioxide collection bottle 5 connected with the bottom of the liquefied carbon dioxide discharge pipe 24 by screwing is used, so that the cold liquefied carbon dioxide will fall into the inside of the liquefied carbon dioxide collection bottle 5 under the action of gravity, and then the device realizes the function of grading and collecting the materials.
[0060] The preferred embodiments of the present application have been described above, but the present application is not limited to the above embodiments. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A carbon dioxide liquefying device based on LNG cold energy, characterized by, The first-stage heat exchange shell (9), the second-stage heat exchange shell (6), the air compressor (10) and the carbon dioxide gas supply pipe (28) are included. The first-stage heat exchange shell (9) is internally provided with a heat exchange cavity (17), and the heat exchange cavity (17) is internally fixed with a heat exchange pipe group (16); the heat exchange pipe group (16) is respectively provided with an LNG introduction pipe (14) and an LNG discharge pipe (13) communicated with the LNG introduction pipe (14); the heat exchange cavity (17) is respectively provided with a propane discharge pipe (15) and a propane introduction pipe (18); The second-stage heat exchange shell (6) is internally fixed with an outer corrugated heat exchange pipe (22), and the outer corrugated heat exchange pipe (22) is internally fixed with an inner heat exchange pipe (20); the inner heat exchange pipe (20) is respectively provided with a purified carbon dioxide introduction pipe (25) and a liquefied carbon dioxide discharge pipe (24); the outer corrugated heat exchange pipe (22) is respectively provided with a cooling propane supply pipe (21) and a propane recovery pipe (23); the air compressor (10) is communicated with the carbon dioxide gas supply pipe (28), the purified carbon dioxide introduction pipe (25) and the liquefied carbon dioxide discharge pipe (24) in sequence; the propane introduction pipe (18) is communicated with the propane discharge pipe (15), the cooling propane supply pipe (21) and the propane recovery pipe (23) in sequence.
2. The LNG cold- energy based carbon dioxide liquefier as claimed in claim 1, wherein, The LNG-based carbon dioxide liquefaction device further comprises an LNG recovery tank (2) and an LNG feeding tank (3); the LNG feeding tank (3) is communicated with the LNG introduction pipe (14); the LNG recovery tank (2) is communicated with the LNG discharge pipe (13).
3. The LNG cold- energy based carbon dioxide liquefier as claimed in claim 2, wherein, The LNG-based carbon dioxide liquefaction device further comprises a propane feeding tank (1) and a propane recovery tank (8); the propane feeding tank (1) is communicated with the propane introduction pipe (18); the propane recovery tank (8) is communicated with the propane recovery pipe (23).
4. The LNG cold- energy based carbon dioxide liquefier as claimed in claim 3, wherein, The LNG-based carbon dioxide liquefaction device further comprises a liquefied carbon dioxide collection bottle (5) communicated with the liquefied carbon dioxide discharge pipe (24).
5. The LNG cold- energy based carbon dioxide liquefier as claimed in claim 4, wherein, The LNG-based carbon dioxide liquefaction device further comprises a carbon dioxide deoxygenation purifier (11) disposed between the carbon dioxide gas supply pipe (28) and the air compressor (10).
6. The LNG cold energy based carbon dioxide liquefier according to claim 5, wherein, The air compressor (10) is installed with an air pressure gauge (26).
7. The LNG cold energy based carbon dioxide liquefier according to claim 5, wherein, The LNG-based carbon dioxide liquefaction device further comprises a rack (4), and the propane feeding tank (1), the LNG recovery tank (2), the LNG feeding tank (3), the liquefied carbon dioxide collection bottle (5), the second-stage heat exchange shell (6), the propane recovery tank (8), the first-stage heat exchange shell (9), the air compressor (10) and the carbon dioxide deoxygenation purifier (11) are detachably installed on the rack (4).
8. The LNG cold energy based carbon dioxide liquefier according to any one of claims 1-7, characterized in that, The outer side walls of the first-stage heat exchange shell (9) and the second-stage heat exchange shell (6) are both provided with rubber heat insulation layers.
9. The LNG cold energy based carbon dioxide liquefier according to claim 8, wherein, The inner walls of the first-stage heat exchange shell (9) and the second-stage heat exchange shell (6) are both provided with temperature and humidity sensors (7).