Production device of liquid carbon dioxide

Abstract

The utility model provides a production device of liquid carbon dioxide. The production device of the liquid carbon dioxide comprises desulfurization process equipment, dealkylation process equipment, purification process equipment, liquefaction purification equipment and compression process equipment, the compression process equipment comprises a first compression assembly, a second compression assembly, a third compression assembly and a fourth compression assembly; the desulfurization process equipment comprises a raw material gas inlet pipeline, a deep freezer and a desulfurization tower, the two ends of the first compression assembly are communicated with the raw material gas inlet pipeline and the deep freezer, and the desulfurization tower is communicated with the deep freezer; two ends of the second compression assembly are communicated with the desulfurization tower and dealkylation process equipment; two ends of the third compression assembly are communicated with the dealkylation process equipment and the purification process equipment; two ends of the fourth compression assembly are communicated with the purification process equipment and the liquefaction purification equipment. The compression procedure is matched with the working conditions of the desulfurization procedure, the dealkylation procedure, the purification procedure and the liquefaction and purification procedure, so that the impurity removal efficiency and the liquefaction efficiency of carbon dioxide production are improved.

Description

Technical Field

[0001] This disclosure relates to the technical field of carbon dioxide production, and in particular to an apparatus for producing liquid carbon dioxide. Background Technology

[0002] Liquid carbon dioxide is produced through desulfurization, dehydrocarbonization, purification, and liquefaction purification processes. The carbon dioxide feedstock entering the desulfurization process is at room temperature and pressure between 10 kPa and 100 kPa. In the liquid carbon dioxide production process, the feedstock gas is first compressed to a pressure of 0.9 MPa to 1.2 MPa, then sequentially passed through the desulfurization, dehydrocarbonization, and purification processes. The purified carbon dioxide gas is then compressed to a pressure of 2.8 MPa to 3.3 MPa before being sent to the liquefaction and distillation purification processes.

[0003] In the carbon dioxide desulfurization process, when the temperature and pressure of the carbon dioxide feed gas entering the desulfurization tower are too high, the adsorption capacity of the adsorbent in the desulfurization tower is less, which is not conducive to the adsorption of the desulfurization adsorbent. The pressure change will change the specific surface area and structure of the catalyst. The high pressure of the carbon dioxide feed gas entering the dehydrocarbonization process results in lower activity of the dehydrocarbonization catalyst, thus affecting the efficiency of carbon dioxide gas in the dehydrocarbonization process.

[0004] For example, the prior art document CN201210583434.X discloses a method for reducing carbon dioxide emissions in the production of food-grade liquid carbon dioxide, which includes the following steps: a denitrification process; a first compression process; a desulfurization process; a dehydrogenation process; a purification process; a second compression process; a liquefaction process; and a distillation purification process. This method can significantly reduce carbon dioxide emissions. However, after the compression process, the temperature and pressure of the carbon dioxide feed gas entering the desulfurization tower are too high, which is not conducive to the adsorption of the desulfurization adsorbent. The high pressure of the carbon dioxide feed gas entering the dehydrogenation process results in low catalyst activity, thus affecting the efficiency of liquid carbon dioxide production. Utility Model Content

[0005] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a liquid carbon dioxide production apparatus that improves the efficiency of impurity removal and liquefaction efficiency by matching the operating conditions through a four-stage compression process.

[0006] The purpose of this disclosure is achieved through the following technical solution:

[0007] A liquid carbon dioxide production apparatus includes desulfurization equipment, dehydrocarbonization equipment, purification equipment, liquefaction and purification equipment, and compression equipment.

[0008] The compression process equipment includes a first compression assembly, a second compression assembly, a third compression assembly, and a fourth compression assembly;

[0009] The desulfurization equipment includes a raw material inlet pipe, a cryostat, and a desulfurization tower. The raw material inlet pipe is connected to the inlet end of the first compression assembly, the inlet end of the cryostat is connected to the outlet end of the first compression assembly, and the desulfurization tower is connected to the outlet end of the cryostat.

[0010] The inlet of the second compression component is connected to the outlet of the desulfurization tower, and the inlet of the dehydrocarbonization process equipment is connected to the outlet of the second compression component; the inlet of the third compression component is connected to the outlet of the dehydrocarbonization process equipment, and the outlet of the third compression component is connected to the inlet of the purification process equipment, and the purification process equipment is connected to the outlet of the third compression component; the inlet of the fourth compression component is connected to the outlet of the purification process equipment, and the inlet of the liquefaction purification equipment is connected to the purification process equipment, and the outlet of the liquefaction purification equipment is used to connect to a storage tank.

[0011] In one embodiment, the desulfurization process equipment further includes a first ambient temperature cooler, one end of which is connected to the outlet end of the first compression assembly, and the other end of which is connected to the inlet end of the cryogenic unit.

[0012] In one embodiment, the dehydrogenation process equipment includes a dehydrogenation heat exchanger, a dehydrogenation heater, and a dehydrogenation reactor. The inlet end of the dehydrogenation heat exchanger is connected to the outlet end of the second compression assembly. The dehydrogenation heat exchanger, the dehydrogenation heater, and the dehydrogenation reactor are connected in sequence. The outlet end of the dehydrogenation reactor is also connected to the inlet end of the third compression assembly.

[0013] In one embodiment, the dehydrogenation process equipment further includes a second ambient temperature cooler, one end of which is connected to the outlet end of the second compression assembly, and the other end of which is connected to the inlet end of the dehydrogenation heat exchanger.

[0014] In one embodiment, the dehydrogenation process equipment further includes a dehydrogenation cooler and a water separator, wherein the inlet of the dehydrogenation cooler is connected to the outlet of the dehydrogenation reactor, the inlet of the water separator is connected to the outlet of the dehydrogenation cooler, and the outlet of the water separator is connected to the inlet of the third compression assembly.

[0015] In one embodiment, the purification process equipment includes a purification tower, a regeneration preheater, and a purification heat exchanger. The air inlet of the purification tower is connected to the air outlet of the third compression assembly. The regeneration preheater is connected to the purification tower and is used for backflushing and regenerating the purification tower. The purification heat exchanger is connected to the regeneration preheater. The air outlet of the purification tower is connected to the air inlet of the fourth compression assembly.

[0016] In one embodiment, the purification process equipment further includes a third ambient temperature cooler, one end of which is connected to the outlet of the third compression assembly, and the other end of which is connected to the inlet of the purification tower.

[0017] In one embodiment, the liquefaction purification equipment includes a liquid nitrogen cryotube, an evaporator-condenser, and a purification tower. The liquid nitrogen cryotube is connected to a cooling channel opened in the evaporator-condenser. The evaporator-condenser is connected to the outlet of the fourth compression assembly. The liquid inlet of the purification tower is connected to the outlet of the evaporator-condenser. The liquid outlet of the purification tower is used to connect to a storage tank.

[0018] In one embodiment, the liquefaction purification equipment further includes a fourth ambient temperature cooler, one end of which is connected to the outlet of the fourth compression assembly, and the other end of which is connected to the inlet of the evaporator condenser.

[0019] In one embodiment, the liquefaction purification equipment further includes a subcooler, which has a subcooling channel connected to the liquid nitrogen freezing pipe. The air inlet of the subcooler is connected to the liquid outlet of the purification tower, and the air outlet of the subcooler is connected to a storage tank.

[0020] Compared with the prior art, this disclosure has at least the following advantages:

[0021] In the aforementioned liquid carbon dioxide production apparatus, the carbon dioxide feedstock gas is cooled by a cryocooler, lowering its temperature before entering the desulfurization tower and increasing the adsorption capacity of the adsorbent. The desulfurized carbon dioxide gas enters the dehydrocarbonization process equipment at a lower pressure, resulting in higher catalyst activity and improved efficiency in removing hydrocarbon impurities. After being pressurized, the dehydrocarbonized carbon dioxide gas enters the purification process equipment, further enhancing its adsorption efficiency for moisture and oxygen-containing organic impurities. The purified carbon dioxide gas is then pressurized again before entering the liquefaction and purification equipment, increasing its liquefaction efficiency. The first, second, third, and fourth compression components in the compression process are adapted to the operating conditions of the desulfurization, dehydrocarbonization, purification, and liquefaction and purification processes, improving the efficiency of impurity removal and carbon dioxide liquefaction in the production of liquefied carbon dioxide gas, thereby enhancing both the efficiency and quality of liquefied carbon dioxide production. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of a liquid carbon dioxide production apparatus according to an embodiment;

[0024] Figure 2 for Figure 1 The diagram shows the structure of the desulfurization equipment.

[0025] Figure 3 for Figure 1 The diagram shows the structure of the dehydrocarbonization process equipment.

[0026] Figure 4 for Figure 1 The diagram shows the structure of the purification process equipment.

[0027] Figure 5 for Figure 1 The diagram shows the structure of the liquefaction and purification equipment. Detailed Implementation

[0028] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.

[0029] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments:

[0032] like Figures 1 to 5 As shown, the liquid carbon dioxide production apparatus 10 of this disclosure includes a desulfurization process equipment 100, a dehydrocarbonization process equipment 200, a purification process equipment 300, a liquefaction and purification equipment 400, and a compression process equipment 500.

[0033] The compression process equipment 500 includes a first compression component 510, a second compression component 520, a third compression component 530, and a fourth compression component 540;

[0034] The desulfurization process equipment 100 includes a raw material inlet pipe 110, a cryostat 120, and a desulfurization tower 130. The raw material inlet pipe 110 is connected to the inlet end of the first compression assembly 510, the inlet end of the cryostat 120 is connected to the outlet end of the first compression assembly 510, and the desulfurization tower 130 is connected to the outlet end of the cryostat 120. The inlet end of the second compression assembly 520 is connected to the outlet end of the desulfurization tower 130, and the inlet end of the dehydrocarbon removal process equipment 200 is connected to the outlet end of the second compression assembly 520. The third compression assembly 530 has its inlet end connected to the outlet end of the dehydrocarbonization process equipment 200, and its outlet end connected to the inlet end of the purification process equipment 300. The purification process equipment 300 is connected to the outlet end of the third compression assembly 530. The fourth compression assembly 540 has its inlet end connected to the outlet end of the purification process equipment 300, and its inlet end connected to the liquefaction purification equipment 400. The outlet end of the liquefaction purification equipment 400 is used to connect to a storage tank.

[0035] In this embodiment, the carbon dioxide feedstock gas first enters the first compression assembly 510 through the feedstock inlet pipe 110 for compression and pressurization. After the first pressurization, the pressure of the carbon dioxide feedstock gas is approximately 0.4 MPa. The pressurized carbon dioxide feedstock gas then enters the cryogenic cooler 120 for cooling. Chilled water is circulated inside the cryogenic cooler 120, and the temperature of the carbon dioxide feedstock gas rapidly decreases to below 10°C after passing through the cryogenic cooler. The pressurized, low-temperature carbon dioxide feedstock gas then enters the desulfurization tower 130 for desulfurization. The desulfurized carbon dioxide gas then enters the second compression assembly 520 for a second pressurization. After the second pressurization, the pressure is approximately 0.8 MPa. The pressurized, desulfurized carbon dioxide gas then enters the desulfurization tower 130 for desulfurization. In the hydrocarbon equipment, the desulfurized carbon dioxide gas reacts with oxygen in the catalyst of the dehydrogenation process equipment 200 to carry out the dehydrogenation process. The dehydrogenated carbon dioxide gas enters the third compression component 530 for a third pressurization. The pressure after the third pressurization is about 1.5 MPa. After pressurization, the dehydrogenated carbon dioxide gas enters the purification equipment for purification to remove moisture and oxygen-containing organic matter from the raw gas. The purified carbon dioxide gas enters the fourth compression component 540 for pressurization. The pressure after the fourth pressurization is about 2.4 MPa. The pressurized and purified carbon dioxide gas enters the liquefaction purification equipment 400 for liquefaction. The liquefied carbon dioxide liquid is sent to the storage tank.

[0036] In the aforementioned liquid carbon dioxide production apparatus 10, the carbon dioxide feed gas is cooled by a cryocooler 120, lowering its temperature before entering the desulfurization tower 130 and thus increasing the adsorption capacity of the adsorbent in the desulfurization tower 130. The desulfurized carbon dioxide gas enters the dehydrocarbonization process equipment 200 at a lower pressure, resulting in higher catalyst activity and improved efficiency in removing hydrocarbon impurities from the carbon dioxide gas. After being pressurized, the dehydrocarbonized carbon dioxide gas enters the purification process equipment 300, thus improving the purification process equipment 300's efficiency. The efficiency of adsorbing moisture and oxygen-containing organic impurities is improved; after the purified carbon dioxide gas is repressurized, it enters the liquefaction purification equipment 400, which improves the liquefaction efficiency of the liquefaction purification equipment 400; the first compression component 510, the second compression component 520, the third compression component 530 and the fourth compression component 540 of the compression process are adapted to the working conditions of the desulfurization process, the dehydrocarbonization process, the purification process and the liquefaction purification process, which improves the efficiency of removing impurities in the production of liquefied carbon dioxide gas and improves the efficiency of carbon dioxide liquefaction, thereby improving the efficiency and quality of liquefied carbon dioxide gas production.

[0037] like Figure 2 As shown, in one embodiment, the desulfurization process equipment 100 further includes a first ambient temperature cooler 140. One end of the first ambient temperature cooler 140 is connected to the outlet end of the first compression assembly 510, and the other end of the first ambient temperature cooler 140 is connected to the inlet end of the cryogenic cooler 120. In this embodiment, the carbon dioxide feed gas has a high temperature. When the carbon dioxide feed gas passes through the first ambient temperature cooler 140, the temperature of the carbon dioxide feed gas is reduced through heat exchange, which reduces the cooling difficulty of the cryogenic cooler 120 for the carbon dioxide feed gas and improves the cooling efficiency of the cryogenic cooler 120 for the carbon dioxide feed gas.

[0038] like Figure 3 As shown, in one embodiment, the dehydrogenation process equipment 200 includes a dehydrogenation heat exchanger 210, a dehydrogenation heater 220, and a dehydrogenation reactor 230. The inlet of the dehydrogenation heat exchanger 210 is connected to the outlet of the second compression assembly 520. The dehydrogenation heat exchanger 210, the dehydrogenation heater 220, and the dehydrogenation reactor 230 are sequentially connected. The outlet of the dehydrogenation reactor 230 is also connected to the inlet of the third compression assembly 530. In this embodiment, the dehydrogenation heat exchanger 210 condenses and removes low-boiling-point hydrocarbon compounds in the carbon dioxide gas. The dehydrogenation heater 220 increases the temperature of the carbon dioxide gas before it enters the dehydrogenation reactor 230. This facilitates the reaction of oxygen-containing organic impurities in the heated carbon dioxide gas with the catalyst to produce water and carbon dioxide.

[0039] like Figure 3 As shown, in one embodiment, the dehydrogenation process equipment 200 further includes a second ambient temperature cooler 240. One end of the second ambient temperature cooler 240 is connected to the outlet end of the second compression assembly 520, and the other end of the second ambient temperature cooler 240 is connected to the inlet end of the dehydrogenation heat exchanger 210. In this embodiment, after desulfurization, the carbon dioxide pressure increases after passing through the second compression assembly 520, and the temperature of the carbon dioxide gas increases. Heat exchange occurs through the second ambient temperature cooler 240, causing the temperature of the carbon dioxide gas to decrease. The cooled carbon dioxide gas then flows into the dehydrogenation heat exchanger 210, which facilitates heat exchange and condensation within the dehydrogenation heat exchanger 210 to remove low-boiling-point hydrocarbon compounds.

[0040] like Figure 3 As shown, in one embodiment, the dehydrogenation process equipment 200 further includes a dehydrogenation cooler 250 and a water separator 260. The inlet of the dehydrogenation cooler 250 is connected to the outlet of the dehydrogenation reactor 230, the inlet of the water separator 260 is connected to the outlet of the dehydrogenation cooler 250, and the outlet of the water separator 260 is connected to the inlet of the third compression assembly 530. In this embodiment, the dehydrogenation cooler 250 is used to cool the moisture in the dehydrogenated carbon dioxide gas, and then the water separator 260 separates the moisture, thereby reducing the moisture content of the dehydrogenated carbon dioxide gas passing through the dehydrogenation cooler 250 and the water separator 260.

[0041] like Figure 4 As shown, in one embodiment, the purification process equipment 300 includes a purification tower 310, a regeneration preheater 320, and a purification heat exchanger 330. The air inlet of the purification tower 310 is connected to the air outlet of the third compression assembly 530. The purification tower 310 and the regeneration preheater 320 are connected to the purification tower 310. The regeneration preheater 320 is used for backflushing and regenerating the purification tower 310. The purification heat exchanger 330 is connected to the regeneration preheater 320. The air outlet of the purification tower 310 is connected to the air inlet of the fourth compression assembly 540. In this embodiment, the purification tower 310 uses pressure swing adsorption with an adsorbent to remove moisture and trace amounts of oxygen-containing organic matter remaining from the dehydrocarbonization process in the carbon dioxide gas. When the adsorbent in the purification tower 310 is saturated, high-temperature gas can be introduced through the regeneration preheater 320 to regenerate the adsorbent in the purification tower 310 by hot blowing. The purification heat exchanger 330 is used to exchange heat with the gas released from the flash steam of the evaporator condenser 420, and then it is introduced into the regeneration preheater 320 for utilization.

[0042] like Figure 4As shown, in one embodiment, the purification process equipment 300 further includes a third ambient temperature cooler 340. One end of the third ambient temperature cooler 340 is connected to the outlet end of the third compression assembly 530, and the other end of the third ambient temperature cooler 340 is connected to the inlet end of the purification tower 310. In this embodiment, after the dehydrocarbonized carbon dioxide gas passes through the third compression assembly 530, the temperature of the pressurized dehydrocarbonized carbon dioxide gas increases. The third ambient temperature cooler 340 lowers the temperature of the purified carbon dioxide gas, allowing the ambient temperature dehydrocarbonized carbon dioxide gas to enter the purification process equipment 300 for purification. The low temperature is beneficial to the adsorption of the adsorbent in the purification process equipment 300, thereby improving the purification effect of the purification process equipment 300 on the dehydrocarbonized carbon dioxide gas.

[0043] like Figure 5 As shown, in one embodiment, the liquefaction purification equipment 400 includes a liquid nitrogen freezing pipe 410, an evaporator condenser 420, and a purification tower 430. The liquid nitrogen freezing pipe 410 is connected to a cooling channel opened in the evaporator condenser. The evaporator condenser 420 is connected to the gas outlet of the fourth compression assembly 540. The liquid inlet of the purification tower 430 is connected to the gas outlet of the evaporator condenser 420. The liquid outlet of the purification tower 430 is used to connect to a storage tank. In this embodiment, the pressure of the purified carbon dioxide gas is increased after compression by the fourth compression component 540. The purified carbon dioxide gas with higher pressure flows into the evaporator condenser 420. Liquid nitrogen is introduced into the liquid nitrogen freezing pipe 410 and connected to the cooling channel of the evaporator condenser 420, so that the carbon dioxide gas in the evaporator condenser 420 is liquefied. Both cooling and pressurization will cause the carbon dioxide gas to liquefy. The liquefied carbon dioxide and the uncondensed carbon dioxide gas are sent to the purification tower 430. The purification tower 430 purifies the gas by distillation, so that other gaseous impurities that were not adsorbed and removed and the uncondensed gas are released by distillation. Purified liquid carbon dioxide is obtained at the bottom of the purification tower 430.

[0044] like Figure 5 As shown, in one embodiment, the liquefaction purification equipment 400 further includes a fourth ambient temperature cooler 440. One end of the fourth ambient temperature cooler 440 is connected to the outlet end of the fourth compression assembly 540, and the other end of the fourth ambient temperature cooler 440 is connected to the inlet end of the evaporator-condenser 420. In this embodiment, the temperature of the purified carbon dioxide increases after passing through the fourth compression assembly 540, and the temperature of the carbon dioxide gas decreases after passing through the fourth ambient temperature cooler 440 before flowing into the liquefaction purification equipment 400. This reduces the heat absorbed by the carbon dioxide gas during liquefaction, thereby improving the carbon dioxide liquefaction efficiency.

[0045] like Figure 5As shown, in one embodiment, the liquefaction purification equipment 400 further includes a subcooler 450. The subcooler 450 has a subcooling channel connected to the liquid nitrogen freezing pipe 410. The inlet of the subcooler 450 is connected to the liquid outlet of the purification tower 430, and the outlet of the subcooler 450 is connected to a storage tank. In this embodiment, the subcooler 450 is connected to the subcooling channel of the liquid nitrogen freezing pipe 410. After passing through the subcooler 450, the temperature of the liquid carbon dioxide is further reduced to a subcooled state, maintaining the stability of the liquid carbon dioxide and thus ensuring the quality of the liquid carbon dioxide flowing into the storage tank.

[0046] Compared with the prior art, this disclosure has at least the following advantages:

[0047] In the aforementioned liquid carbon dioxide production apparatus 10, the carbon dioxide feed gas is cooled by a cryocooler 120, lowering its temperature before entering the desulfurization tower 130 and thus increasing the adsorption capacity of the adsorbent in the desulfurization tower 130. The desulfurized carbon dioxide gas enters the dehydrocarbonization process equipment 200 at a lower pressure, resulting in higher catalyst activity and improved efficiency in removing hydrocarbon impurities from the carbon dioxide gas. After being pressurized, the dehydrocarbonized carbon dioxide gas enters the purification process equipment 300, thus improving the purification process equipment 300's efficiency. The efficiency of adsorbing moisture and oxygen-containing organic impurities is improved; after the purified carbon dioxide gas is repressurized, it enters the liquefaction purification equipment 400, which improves the liquefaction efficiency of the liquefaction purification equipment 400; the first compression component 510, the second compression component 520, the third compression component 530 and the fourth compression component 540 of the compression process are adapted to the working conditions of the desulfurization process, the dehydrocarbonization process, the purification process and the liquefaction purification process, which improves the efficiency of removing impurities in the production of liquefied carbon dioxide gas and improves the efficiency of carbon dioxide liquefaction, thereby improving the efficiency and quality of liquefied carbon dioxide gas production.

[0048] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A liquid carbon dioxide production apparatus, characterized in that, This includes equipment for desulfurization, dehydrocarbon removal, purification, liquefaction and purification, and compression processes. The compression process equipment includes a first compression assembly, a second compression assembly, a third compression assembly, and a fourth compression assembly; The desulfurization equipment includes a raw material inlet pipe, a cryostat, and a desulfurization tower. The raw material inlet pipe is connected to the inlet end of the first compression assembly, the inlet end of the cryostat is connected to the outlet end of the first compression assembly, and the desulfurization tower is connected to the outlet end of the cryostat. The inlet of the second compression component is connected to the outlet of the desulfurization tower, and the inlet of the dehydrocarbonization process equipment is connected to the outlet of the second compression component; the inlet of the third compression component is connected to the outlet of the dehydrocarbonization process equipment, and the outlet of the third compression component is connected to the inlet of the purification process equipment, and the purification process equipment is connected to the outlet of the third compression component; the inlet of the fourth compression component is connected to the outlet of the purification process equipment, and the inlet of the liquefaction purification equipment is connected to the purification process equipment, and the outlet of the liquefaction purification equipment is used to connect to a storage tank.

2. The apparatus for producing liquid carbon dioxide according to claim 1, wherein The desulfurization process equipment also includes a first ambient temperature cooler, one end of which is connected to the outlet end of the first compression assembly, and the other end of which is connected to the inlet end of the cryogenic unit.

3. The apparatus for producing liquid carbon dioxide according to claim 1, wherein The dehydrogenation process equipment includes a dehydrogenation heat exchanger, a dehydrogenation heater, and a dehydrogenation reactor. The inlet end of the dehydrogenation heat exchanger is connected to the outlet end of the second compression assembly. The dehydrogenation heat exchanger, the dehydrogenation heater, and the dehydrogenation reactor are connected in sequence. The outlet end of the dehydrogenation reactor is also connected to the inlet end of the third compression assembly.

4. The apparatus for producing liquid carbon dioxide according to claim 3, wherein The dehydrogenation process equipment also includes a second ambient temperature cooler, one end of which is connected to the outlet end of the second compression assembly, and the other end of which is connected to the inlet end of the dehydrogenation heat exchanger.

5. The apparatus for producing liquid carbon dioxide according to claim 3, wherein The dehydrogenation process equipment also includes a dehydrogenation cooler and a water separator. The inlet of the dehydrogenation cooler is connected to the outlet of the dehydrogenation reactor, the inlet of the water separator is connected to the outlet of the dehydrogenation cooler, and the outlet of the water separator is connected to the inlet of the third compression assembly.

6. The apparatus for producing liquid carbon dioxide according to claim 1, wherein The purification process equipment includes a purification tower, a regeneration preheater, and a purification heat exchanger. The air inlet of the purification tower is connected to the air outlet of the third compression component. The regeneration preheater is connected to the purification tower and is used for backflushing and regenerating the purification tower. The purification heat exchanger is connected to the regeneration preheater. The air outlet of the purification tower is connected to the air inlet of the fourth compression component.

7. The apparatus for producing liquid carbon dioxide according to claim 6, wherein The purification process equipment also includes a third ambient temperature cooler, one end of which is connected to the outlet of the third compression assembly, and the other end of which is connected to the inlet of the purification tower.

8. The apparatus for producing liquid carbon dioxide according to claim 1, wherein The liquefaction and purification equipment includes a liquid nitrogen freezing pipe, an evaporator-condenser, and a purification tower. The liquid nitrogen freezing pipe is connected to a cooling channel opened in the evaporator-condenser. The evaporator-condenser is connected to the outlet of the fourth compression component. The liquid inlet of the purification tower is connected to the outlet of the evaporator-condenser. The liquid outlet of the purification tower is used to connect to a storage tank.

9. The liquid carbon dioxide production apparatus according to claim 8, characterized in that, The liquefaction and purification equipment also includes a fourth ambient temperature cooler, one end of which is connected to the outlet of the fourth compression assembly, and the other end of which is connected to the inlet of the evaporator condenser.

10. The apparatus for producing liquid carbon dioxide according to claim 8, wherein The liquefaction and purification equipment also includes a subcooler, which has a subcooling channel connected to the liquid nitrogen freezing pipe. The air inlet of the subcooler is connected to the liquid outlet of the purification tower, and the air outlet of the subcooler is connected to a storage tank.

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