Refrigerating system

Abstract

The utility model relates to a refrigerating system, which belongs to the technical field of refrigerating systems and comprises two screw-type refrigerant compressors, a refrigerating mechanism and a pipeline component, and the refrigerating mechanism is communicated with the two screw-type refrigerant compressors through the pipeline component. The refrigerating mechanism comprises a front-section condenser, a liquid reservoir, a rear-section condenser, a water separation tank, a gas-liquid separator, a food-grade liquefier, a dry ice tail gas liquefier, a rectifying tower, a dry ice tail gas total condenser and a dry ice tail gas subcooler; the front-section condenser is communicated with the two screw type refrigerant compressors, the liquid reservoir is communicated with the front-section condenser, the rear-section condenser is communicated with the water separation tank, the rear-section condenser is communicated with the gas-liquid separator, and the food-grade liquefier is communicated with the gas-liquid separator. According to the refrigerating system, the use of most circulating water can be omitted, the effective refrigerating effect is achieved through the refrigerating process of the system, and the energy consumption of the whole unit can be reduced.

Description

Technical Field

[0001] This application relates to the field of refrigeration system technology, specifically a refrigeration system. Background Technology

[0002] Carbon dioxide is a new type of natural working fluid. As a refrigerant, carbon dioxide has many unique advantages. In terms of its environmental impact, apart from water and air, carbon dioxide is the most environmentally friendly refrigerant. Carbon dioxide has good safety and chemical stability. It is safe and non-toxic and does not produce harmful gases even at high temperatures. It has thermophysical properties that are compatible with refrigeration cycles and equipment, making it well-suited for use in refrigeration systems.

[0003] According to the carbon dioxide refrigeration system disclosed in Chinese Patent Publication No. CN216557741U, this patent reduces the water and energy consumption of data centers by utilizing adiabatic phase change cycles and achieves indoor cooling through the conversion of CO2 state. Moreover, CO2 is a natural substance and will not have an impact on the environment. In particular, it solves the problems of high energy consumption and large water consumption of refrigeration systems that use water as a refrigerant for data centers.

[0004] However, this patent still has some shortcomings in actual use. Because the patent requires controlling the spray wet film to humidify outdoor air with a temperature higher than the preset wet-bulb temperature, although the waste of water resources can be reduced by controlling the opening and closing, it still requires the introduction of external water for system use. Its energy-saving performance can be improved. In this regard, this application provides a refrigeration system to solve the above problems. Utility Model Content

[0005] To address the shortcomings of existing technologies, this application provides a refrigeration system that has the advantages of eliminating the use of most circulating water, achieving effective cooling through the system's own refrigeration process, and reducing the overall energy consumption of the unit. This solves the problem that existing carbon dioxide refrigeration systems require the introduction of external water resources during actual use, which leaves room for improvement in actual energy efficiency.

[0006] To achieve the above objectives, this application provides the following technical solution: a refrigeration system, comprising two screw refrigerant compressors, a refrigeration mechanism, and a piping assembly, wherein the refrigeration mechanism and the two screw refrigerant compressors are connected through the piping assembly;

[0007] The refrigeration mechanism includes a front-end condenser, a liquid receiver, a rear-end condenser, a water separator, a gas-liquid separator, a food-grade liquefier, a dry ice tail gas liquefier, a distillation column, a dry ice tail gas total condenser, and a dry ice tail gas subcooler. The front-end condenser is connected to two screw refrigerant compressors, the liquid receiver is connected to the front-end condenser, the rear-end condenser is connected to the water separator, the rear-end condenser is connected to the gas-liquid separator, the food-grade liquefier is connected to the gas-liquid separator, the dry ice tail gas liquefier is connected to the gas-liquid separator and the distillation column, and the distillation column is connected to the gas-liquid separator.

[0008] By adopting the above technical solution, most of the circulating water usage can be eliminated, and the system's own cooling process can achieve an effective cooling effect.

[0009] Furthermore, the piping assembly includes a main gas pipe, a first one-way valve, a branch gas pipe, an exhaust pipe, a fixed pipe, a connecting pipe, a second one-way valve, a main pipeline, a first pipeline, a second pipeline, a third pipeline, a fourth pipeline, a fifth pipeline, a sixth pipeline, a seventh pipeline, an eighth pipeline, a ninth pipeline, a regulating valve, a manifold, a central pipe, a return pipe, a first connecting pipe, a second connecting pipe, a third connecting pipe, a fourth connecting pipe, and a fifth connecting pipe.

[0010] By adopting the above technical solution, the refrigeration mechanism can be connected.

[0011] Furthermore, the first one-way valve is fixedly installed on the main gas pipe, and there are two gas distribution pipes, which are respectively fixedly connected to the input ends of two screw refrigerant compressors. The main gas pipe and the two gas distribution pipes are connected.

[0012] By adopting the above technical solution, gaseous refrigerant can be delivered to the interior of two screw refrigerant compressors through the main gas pipe and two branch gas pipes for compression.

[0013] Furthermore, there are two discharge pipes, which are respectively fixedly installed at the output ends of two screw refrigerant compressors. The fixed pipe is fixedly installed at the input end of the front condenser and connected to the ends of the two discharge pipes. The connecting pipe is fixedly installed between the output end of the front condenser and the input end of the liquid receiver. A second one-way valve is fixed on both the connecting pipe and the fixed pipe.

[0014] By adopting the above technical solution, the compressed gas inside the screw refrigerant compressor can enter the interior of the fixed pipe through the discharge pipe and then enter the front condenser for condensation.

[0015] Furthermore, the main pipeline is fixed to the output end of the liquid reservoir, and the first, second, third, fourth, fifth, sixth, seventh, eighth and ninth pipelines are all fixed to the outside of the main pipeline. Regulating valves are installed on the first, second, third, fourth, fifth, sixth and seventh pipelines.

[0016] By adopting the above technical solution, the liquid refrigerant in the main pipeline can flow into pipelines one, two, three, four, five, six, seven, eight, and nine respectively.

[0017] Furthermore, the output end of the pipeline is fixedly connected to the input end of the downstream condenser, a central pipe is fixed between the output end of the downstream condenser and the input end of the gas-liquid separator, a manifold is fixed between the output end of the internal condenser tube of the downstream condenser and the input end of the water distribution tank, and the return pipe is fixedly installed between the output end of the gas-liquid separator and the outside of the main gas pipe.

[0018] By adopting the above technical solution, the refrigerant in the downstream condenser can enter the gas-liquid separator and be transported back to the main gas pipe for circulation through the return pipe.

[0019] Furthermore, the output end of the second pipeline is fixedly connected to the input end of the food-grade liquefier, the output end of the food-grade liquefier is fixedly connected to the input end of the distillation column through the second connecting pipe, the refrigerant output end of the food-grade liquefier is fixedly connected to the outside of the central pipe through the first connecting pipe, the output end of the third pipeline is fixedly connected to the input end of the dry ice tail gas liquefier, the output end of the dry ice tail gas liquefier is fixedly connected to the input end of the distillation column through the fourth connecting pipe, and the refrigerant output end of the dry ice tail gas liquefier is fixedly connected to the outside of the first connecting pipe through the third connecting pipe.

[0020] By adopting the above technical solutions, the food-grade liquefier and the dry ice tail gas liquefier can receive liquid refrigerant from the second and third pipelines respectively, and can also allow carbon dioxide and refrigerant to be transported normally to downstream equipment.

[0021] Furthermore, the output ends of the four pipelines are fixedly connected to the total condenser at the top of the distillation column, the fifth connecting pipe is fixedly installed between the outside of the total condenser at the top of the distillation column and the central pipe, the output end of the five pipelines is fixedly connected to the input end of the dry ice tail gas total condenser, the output end of the six pipelines is fixedly connected to the bottom of the distillation column, the output end of the seven pipelines is fixedly connected to the input end of the dry ice tail gas subcooler, and the output ends of the eight and nine pipelines are both fixedly connected to the interior of the distillation column and provide it with a heat source.

[0022] By adopting the above technical solution, liquid refrigerant can be transported normally.

[0023] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0024] This refrigeration system, through the coordinated use of two screw refrigerant compressors and refrigeration components and piping, can eliminate the need for most of the circulating water, achieving effective cooling through the system's own refrigeration process. This reduces the overall energy consumption of the unit and enables effective internal refrigerant circulation, further reducing refrigerant consumption and thus further lowering the overall energy consumption of the refrigeration unit, effectively improving the practicality of the refrigeration system. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of this application;

[0026] Figure 2 For the structure of this application Figure 1 A three-dimensional schematic diagram of the connection structure of the main pipeline;

[0027] Figure 3 For the structure of this application Figure 1 Schematic diagram of the connection structure between the main air pipe and the return pipe.

[0028] In the diagram: 1. Screw refrigerant compressor; 201. Front condenser; 202. Liquid receiver; 203. Back condenser; 204. Water separator; 205. Gas-liquid separator; 206. Food-grade liquefier; 207. Dry ice tail gas liquefier; 208. Distillation column; 209. Dry ice tail gas total condenser; 210. Dry ice tail gas subcooler; 301. Main gas pipe; 302. First one-way valve; 303. Distribution pipe; 304. Discharge pipe; 305. Fixed pipe; 306. Connecting pipe; 307. Second one-way valve. 308. Directional valve; 309. Main pipeline; 310. First pipeline; 311. Second pipeline; 312. Third pipeline; 313. Fifth pipeline; 314. Sixth pipeline; 315. Seventh pipeline; 316. Eighth pipeline; 317. Ninth pipeline; 318. Regulating valve; 319. Manifold; 320. Centralized pipe; 321. Return pipe; 322. First connecting pipe; 323. Second connecting pipe; 324. Third connecting pipe; 325. Fourth connecting pipe; 326. Fifth connecting pipe. Detailed Implementation

[0029] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0030] Please see Figures 1 to 3 This application provides a technical solution: a refrigeration system including two screw refrigerant compressors 1, a refrigeration mechanism, and a piping assembly. The refrigeration mechanism and the two screw refrigerant compressors 1 are connected through the piping assembly. By cooperating with the two screw refrigerant compressors 1, the refrigeration mechanism, and the piping assembly, most of the circulating water usage can be eliminated, and the system's own refrigeration process can achieve an effective refrigeration effect. The overall energy consumption of the unit can be reduced, and the effective circulation of internal refrigerant can be achieved, reducing refrigerant consumption and further reducing the overall energy consumption of the refrigeration unit, thus effectively improving the practicality of the refrigeration system.

[0031] In this embodiment, the refrigeration mechanism uses liquid carbon dioxide for cooling.

[0032] like Figure 1 and Figure 3 As shown, the refrigeration mechanism includes a front condenser 201, a liquid receiver 202, a rear condenser 203, a water separator 204, a gas-liquid separator 205, a food-grade liquefier 206, a dry ice tail gas liquefier 207, a distillation column 208, a dry ice tail gas total condenser 209, and a dry ice tail gas subcooler 210. The front condenser 201 is connected to two screw refrigerant compressors 1, the liquid receiver 202 is connected to the front condenser 201, the rear condenser 203 is connected to the water separator 204, the rear condenser 203 is connected to the gas-liquid separator 205, the food-grade liquefier 206 is connected to the gas-liquid separator 205, the dry ice tail gas liquefier 207 is connected to the gas-liquid separator 205 and the distillation column 208, and the distillation column 208 is connected to the gas-liquid separator 205.

[0033] It should be noted that this allows the gaseous refrigerant to circulate normally within the refrigeration system.

[0034] In this embodiment, the piping assembly is a structure used to connect the refrigeration mechanism.

[0035] like Figure 1 , Figure 2 and Figure 3As shown, the piping assembly includes a main gas pipe 301, a first one-way valve 302, a branch gas pipe 303, an exhaust pipe 304, a fixed pipe 305, a connecting pipe 306, a second one-way valve 307, a main pipeline 308, a first pipeline 309, a second pipeline 310, a third pipeline 311, a fourth pipeline 312, a fifth pipeline 313, a sixth pipeline 314, a seventh pipeline 315, an eighth pipeline 316, a ninth pipeline 317, a regulating valve 318, a manifold 319, a central pipe 320, a return pipe 321, a first connecting pipe 322, a second connecting pipe 323, a third connecting pipe 324, a fourth connecting pipe 325, and a fifth connecting pipe 326.

[0036] It should be noted that the first one-way valve 302 is fixedly installed on the main gas pipe 301, and there are two gas distribution pipes 303, which are respectively fixedly connected to the input ends of the two screw refrigerant compressors 1. The main gas pipe 301 and the two gas distribution pipes 303 are connected, so that the gaseous refrigerant can be delivered to the inside of the two screw refrigerant compressors 1 for compression through the main gas pipe 301 and the two gas distribution pipes 303 respectively.

[0037] In addition, there are two discharge pipes 304, which are fixedly installed at the output ends of the two screw refrigerant compressors 1 respectively. The fixed pipe 305 is fixedly installed at the input end of the front condenser 201 and connected to the ends of the two discharge pipes 304. The connecting pipe 306 is fixedly installed between the output end of the front condenser 201 and the input end of the liquid receiver 202. A second one-way valve 307 is fixed on both the connecting pipe 306 and the fixed pipe 305, so that the compressed gas inside the screw refrigerant compressor 1 can enter the interior of the fixed pipe 305 through the discharge pipe 304 and then enter the front condenser 201 for condensation.

[0038] Meanwhile, the main pipe 308 is fixed to the output end of the liquid receiver 202. Pipes 309, 310, 311, 312, 313, 314, 315, 316, and 317 are all fixed to the outside of the main pipe 308. Regulating valves 318 are installed on pipes 309, 310, 311, 312, 313, 314, and 315, so that the liquid refrigerant in the main pipe 308 can flow into pipes 309, 310, 311, 312, 313, 314, 315, 316, and 317 respectively.

[0039] In addition, the output end of one pipeline 309 is fixedly connected to the input end of the downstream condenser 203, a central pipe 320 is fixed between the output end of the downstream condenser 203 and the input end of the gas-liquid separator 205, a manifold 319 is fixed between the output end of the condenser tube inside the downstream condenser 203 and the input end of the water distribution tank 204, and a return pipe 321 is fixedly installed between the output end of the gas-liquid separator 205 and the outside of the main gas pipe 301, so that the refrigerant in the downstream condenser 203 can enter the gas-liquid separator 205 and be transported back to the main gas pipe 301 for circulation through the return pipe 321.

[0040] Furthermore, the output end of the second pipeline 310 is fixedly connected to the input end of the food-grade liquefier 206. The output end of the food-grade liquefier 206 is fixedly connected to the input end of the distillation column 208 through the second connecting pipe 323. The refrigerant output end of the food-grade liquefier 206 is fixedly connected to the outside of the central pipe 320 through the first connecting pipe 322. The output end of the third pipeline 311 is fixedly connected to the input end of the dry ice tail gas liquefier 207. The output end of the dry ice tail gas liquefier 207 is fixedly connected to the input end of the distillation column 208 through the fourth connecting pipe 325. The refrigerant output end of the dry ice tail gas liquefier 207 is fixedly connected to the outside of the first connecting pipe 322 through the third connecting pipe 324. This allows the food-grade liquefier 206 and the dry ice tail gas liquefier 207 to receive the liquid refrigerant in the second pipeline 310 and the third pipeline 311 respectively, and also allows carbon dioxide and refrigerant to be normally transported to downstream equipment.

[0041] It should also be noted that the output end of the fourth pipe 312 is fixedly connected to the total condenser at the top of the distillation column 208, allowing the liquid refrigerant to be delivered normally. The fifth connecting pipe 326 is fixedly installed between the total condenser at the top of the distillation column 208 and the outside of the central pipe 320, allowing the refrigerant to enter the central pipe 320. The output end of the fifth pipe 313 is fixedly connected to the input end of the dry ice tail gas total condenser 209, allowing the liquid refrigerant to enter normally. The output end of the sixth pipe 314 is fixedly connected to the bottom of the distillation column 208. The output end of the seventh pipe 315 is connected to the dry ice tail gas... The input end of the cooler 210 is fixedly connected, enabling normal delivery of liquid refrigerant. The output ends of the eight-way pipeline 316 and the nine-way pipeline 317 are both fixedly connected to the interior of the distillation column 208 and provide it with a heat source. In the refrigeration unit system, after being compressed by the refrigeration unit, the gaseous refrigerant, which is not liquefied by the condenser, is supplied to the refrigeration unit and sent to the reboiler at the bottom of column #2 and the dry ice tail gas reboiler, where it transfers heat to the bottom liquid of the column. This causes some of the liquid carbon dioxide, along with the mixed light components, to evaporate and return to the distillation column 208. The gaseous refrigerant itself is liquefied and returned to the refrigerant circulation system.

[0042] The working principle of the above embodiments is as follows:

[0043] (1) During operation, the gaseous refrigerant enters the interior of the two branch pipes 303 through the main gas pipe 301, and flows into the interior of the corresponding screw refrigerant compressor 1 for compression. The compressed gas flows into the front condenser 201 through the discharge pipe 304 and the fixed pipe 305 for condensation, so that the gaseous refrigerant is condensed into liquid refrigerant and transported to the interior of the liquid receiver 202 through the connecting pipe 306 for storage. Then, it is distributed through the main pipe 308 to the interior of pipe 309, pipe 310, pipe 311, pipe 312, pipe 313, pipe 314, pipe 315, pipe 316 and pipe 317. The liquid refrigerant in pipe 309 enters the rear condenser 203 after being depressurized by the regulating valve 318, which cools the raw material gas in the pipe to about 10°C. Under these conditions, the gas... Most of the water in the liquid is liquefied and transported to the water separator 204 through the manifold 319 for separation. The liquid refrigerant is vaporized and transported to the gas-liquid separator 205 through the central pipe 320 for gas-liquid separation. The liquid refrigerant in the second and third pipes 310 is throttled and cooled by the regulating valve 318 and then introduced into the food-grade liquefier 206 and the dry ice tail gas liquefier 207, respectively, to cool and liquefy the carbon dioxide gas in the pipes. The light component gas is then transported to the distillation column 208 through the fourth connecting pipe 325 and the second connecting pipe 323. The liquid refrigerant between the liquefier pipes is vaporized and transported to the gas-liquid separator 205 through the third connecting pipe 324 and the first connecting pipe 322 for gas-liquid separation. The gaseous refrigerant separated in the gas-liquid separator 205 is transported back to the main gas pipe 301 through the return pipe 321 for recycling.

[0044] (2) The liquid refrigerant in the fourth pipeline 312 and the fifth pipeline 313 is cooled by the regulating valve 318 and then introduced into the shell of the total condenser at the top of the distillation column 208 and the dry ice tail gas total condenser 209 to condense the top fraction in the tubes. The liquid refrigerant in the shell is vaporized and transported to the gas-liquid separator 205 through the fifth connecting pipe 326 for gas-liquid separation. The refrigerant in the sixth pipeline 314 and the seventh pipeline 315 is cooled by the regulating valve 318 and then introduced into the bottom of the distillation column 208. In the subcooler for exported products and the dry ice tail gas subcooler 210, the finished carbon dioxide in the condenser tube continues to cool down to a subcooled state. The liquid refrigerant in the shell is vaporized and enters the gas-liquid separator 205 for separation. The eight-way pipeline 316 and the nine-way pipeline 317 provide the heat source for the distillation column 208, transferring heat to the bottom liquid, so that some of the liquid carbon dioxide, along with the mixed light components, evaporates and returns to the distillation column 208. The gas refrigerator returns to the refrigerant circulation system.

[0045] Compared with existing technologies, this refrigeration system, through the coordinated use of two screw refrigerant compressors 1 and the refrigeration mechanism and piping components, can eliminate the use of most circulating water, achieve effective cooling by utilizing the system's own refrigeration process, and reduce the overall energy consumption of the unit. It can also achieve effective internal refrigerant circulation, reducing refrigerant consumption and further reducing the overall energy consumption of the refrigeration unit. This effectively improves the practicality of the refrigeration system and solves the problem that existing carbon dioxide refrigeration systems require the introduction of external water resources during actual use, leaving room for improvement in actual energy saving.

[0046] All electrical components mentioned in this article are electrically connected to the main controller and power supply. The provision of power supply is common knowledge in the field. The main controller can be a conventional known device such as a computer that can be controlled. It can be implemented by a person skilled in the art through simple programming. All of these are existing public power connection technologies, which will not be described in detail in this article.

Claims

1. A refrigeration system comprising two screw refrigerant compressors (1), a refrigeration mechanism, and a piping assembly, characterized in that: The refrigeration mechanism and the two screw refrigerant compressors (1) are connected by a piping assembly; The refrigeration mechanism includes a front-end condenser (201), a liquid receiver (202), a rear-end condenser (203), a water separator (204), a gas-liquid separator (205), a food-grade liquefier (206), a dry ice tail gas liquefier (207), a distillation column (208), a dry ice tail gas total condenser (209), and a dry ice tail gas subcooler (210); the front-end condenser (201) is connected to two screw refrigerant compressors (1), and the liquid receiver (202)... The dry ice tail gas liquefaction unit (207) is connected to the front condenser (201), the rear condenser (203) is connected to the water separator (204), the rear condenser (203) is connected to the gas-liquid separator (205), the food-grade liquefaction unit (206) is connected to the gas-liquid separator (205), the dry ice tail gas liquefaction unit (207) is connected to the gas-liquid separator (205), and the distillation column (208) is connected to the distillation column (208).

2. The refrigeration system according to claim 1, characterized in that: The piping assembly includes a main gas pipe (301), a first one-way valve (302), a branch gas pipe (303), an exhaust pipe (304), a fixed pipe (305), a connecting pipe (306), a second one-way valve (307), a main pipeline (308), a first pipeline (309), a second pipeline (310), a third pipeline (311), a fourth pipeline (312), a fifth pipeline (313), a sixth pipeline (314), a seventh pipeline (315), an eighth pipeline (316), a ninth pipeline (317), a regulating valve (318), a manifold (319), a central pipe (320), a return pipe (321), a first connecting pipe (322), a second connecting pipe (323), a third connecting pipe (324), a fourth connecting pipe (325), and a fifth connecting pipe (326).

3. A refrigeration system according to claim 2, characterized in that: The first one-way valve (302) is fixedly installed on the main gas pipe (301). There are two gas distribution pipes (303), which are fixedly connected to the input ends of two screw refrigerant compressors (1) respectively. The main gas pipe (301) and the two gas distribution pipes (303) are connected.

4. A refrigeration system according to claim 2, characterized in that: There are two discharge pipes (304), which are fixedly installed at the output ends of two screw refrigerant compressors (1). The fixed pipe (305) is fixedly installed at the input end of the front condenser (201) and connected to the ends of the two discharge pipes (304). The connecting pipe (306) is fixedly installed between the output end of the front condenser (201) and the input end of the liquid receiver (202). A second one-way valve (307) is fixed on both the connecting pipe (306) and the fixed pipe (305).

5. A refrigeration system according to claim 2, characterized in that: The main pipe (308) is fixed to the output end of the reservoir (202). The first pipe (309), the second pipe (310), the third pipe (311), the fourth pipe (312), the fifth pipe (313), the sixth pipe (314), the seventh pipe (315), the eighth pipe (316), and the ninth pipe (317) are all fixed to the outside of the main pipe (308). The first pipe (309), the second pipe (310), the third pipe (311), the fourth pipe (312), the fifth pipe (313), the sixth pipe (314), and the seventh pipe (315) are all equipped with regulating valves (318).

6. A refrigeration system according to claim 2, characterized in that: The output end of the pipeline (309) is fixedly connected to the input end of the downstream condenser (203). A central pipe (320) is fixed between the output end of the downstream condenser (203) and the input end of the gas-liquid separator (205). A manifold (319) is fixed between the output end of the condenser tube inside the downstream condenser (203) and the input end of the water distribution tank (204). The return pipe (321) is fixedly installed between the output end of the gas-liquid separator (205) and the outside of the main gas pipe (301).

7. A refrigeration system according to claim 2, characterized in that: The output end of the second pipeline (310) is fixedly connected to the input end of the food-grade liquefier (206). The output end of the food-grade liquefier (206) is fixedly connected to the input end of the distillation column (208) through the second connecting pipe (323). The refrigerant output end of the food-grade liquefier (206) is fixedly connected to the outside of the central pipe (320) through the first connecting pipe (322). The output end of the third pipeline (311) is fixedly connected to the input end of the dry ice tail gas liquefier (207). The output end of the dry ice tail gas liquefier (207) is fixedly connected to the input end of the distillation column (208) through the fourth connecting pipe (325). The refrigerant output end of the dry ice tail gas liquefier (207) is fixedly connected to the outside of the first connecting pipe (322) through the third connecting pipe (324).

8. A refrigeration system according to claim 2, characterized in that: The output end of the four-way pipe (312) is fixedly connected to the total condenser at the top of the distillation column (208). The fifth connecting pipe (326) is fixedly installed between the total condenser at the top of the distillation column (208) and the outside of the central pipe (320). The output end of the five-way pipe (313) is fixedly connected to the input end of the dry ice tail gas total condenser (209). The output end of the six-way pipe (314) is fixedly connected to the bottom of the distillation column (208). The output end of the seven-way pipe (315) is fixedly connected to the input end of the dry ice tail gas subcooler (210). The output ends of the eight-way pipe (316) and the nine-way pipe (317) are both fixedly connected to the interior of the distillation column (208) and provide it with a heat source.

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