Carbon dioxide circulating system

Abstract

The utility model discloses a carbon dioxide circulation system which comprises an evaporator, a compressor, a rotary heat exchanger and a PLC frequency conversion control unit, an inlet of the rotary heat exchanger comprises a first inlet and a second inlet, and an outlet of the rotary heat exchanger comprises a first outlet and a second outlet; an inlet of the compressor is connected with an outlet of the evaporator; a first inlet of the rotary heat exchanger is connected with an outlet of the compressor, and a first outlet of the rotary heat exchanger is connected with an inlet of the evaporator; an outlet of the evaporator, an outlet of the compressor, a second inlet of the rotary heat exchanger and an outlet of the rotary heat exchanger are all provided with temperature sensors; and the PLC frequency conversion control unit is respectively connected with the temperature sensor, the compressor and the rotary heat exchanger. By means of the scheme, circulation of carbon dioxide can be achieved, the compressor and the rotary heat exchanger can be controlled in time based on the temperature signals, the heating requirement of the tail end is met, and energy waste is reduced.

Description

Technical Field

[0001] This utility model generally relates to the field of heat energy conversion and utilization technology. More specifically, this utility model relates to a carbon dioxide recycling system. Background Technology

[0002] In existing technologies, air source heat pumps are mainly used to drive a compressor with a small amount of electricity to absorb low-temperature heat from the air and then provide heating for the system terminals.

[0003] However, the water supply temperature required by end users is a setpoint for the heat pump system. When the ambient temperature changes in real time, and there are unstable heat load demands due to large day-night temperature differences and wide seasonal temperature variations, air source heat pumps suffer from several problems: poor performance in extremely cold conditions, an imbalance between the stable air source heat pump heating load and the real-time changing end-user heat load demand, lag in heating load, and the risk of equipment damage from high-load operation. Furthermore, most existing air source heat pumps use Freon refrigerant, which is environmentally harmful.

[0004] In view of this, there is an urgent need to provide a carbon dioxide cycle solution to achieve green, stable, high-performance, and high-efficiency heating, and to solve problems such as the imbalance between heating load and the real-time changing terminal heat load demand. Utility Model Content

[0005] In order to at least solve one or more of the technical problems mentioned above, this utility model proposes a carbon dioxide recycling scheme in several aspects.

[0006] This utility model provides a carbon dioxide circulation system, including: an evaporator, a compressor, a rotary heat exchanger, and a PLC frequency converter control unit. The rotary heat exchanger has an inlet including a first inlet and a second inlet, and an outlet including a first outlet and a second outlet. The compressor inlet is connected to the evaporator outlet. The first inlet of the rotary heat exchanger is connected to the compressor outlet, and the first outlet of the rotary heat exchanger is connected to the evaporator inlet. Temperature sensors are installed at the evaporator outlet, the compressor outlet, the second inlet of the rotary heat exchanger, and the rotary heat exchanger outlet. The PLC frequency converter control unit is connected to the temperature sensors, the compressor, and the rotary heat exchanger, respectively.

[0007] In some embodiments, the first inlet is a carbon dioxide inlet and the second inlet is a cooling water inlet.

[0008] In some embodiments, the first outlet is a carbon dioxide outlet, and the second outlet is a cooling water outlet.

[0009] In some embodiments, the rotary heat exchanger employs a spiral structure.

[0010] In some embodiments, the rotary heat exchanger includes an outer tube and an inner tube, the outer tube surrounding the inner tube and forming a gap, wherein the inner tube serves as a channel for the flow of carbon dioxide and the gap serves as a channel for the flow of cooling water.

[0011] In some embodiments, the PLC frequency conversion control unit includes a PLC controller, a disturbance signal receiver, a feedback signal controller, and a display, wherein the disturbance signal receiver, the feedback signal controller, and the display are all connected to the PLC controller.

[0012] In some embodiments, the disturbance signal receiver is connected to the temperature sensor.

[0013] In some embodiments, the feedback signal controller is connected to both the compressor and the rotary heat exchanger.

[0014] Through the carbon dioxide circulation system provided above, this embodiment of the invention achieves carbon dioxide circulation by interconnecting the evaporator, compressor, and rotary heat exchanger. By connecting the PLC frequency converter control unit to the temperature sensor, compressor, and rotary heat exchanger respectively, it can control the compressor and rotary heat exchanger in real time based on temperature signals, meeting the heating needs of the end-user and reducing energy waste. Furthermore, in some embodiments, by adopting a spiral structure for the rotary heat exchanger, compressor power consumption can be reduced, and an expansion valve is unnecessary, thereby mitigating the adverse effects of irreversible losses from the compressor and expansion valve on circulation efficiency. Attached Figure Description

[0015] The above and other objects, features, and advantages of the present invention will become readily understood by reading the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of the present invention are shown by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0016] Figure 1 An exemplary structural diagram of a carbon dioxide recycling system according to an embodiment of the present invention is shown;

[0017] Figure 2 An exemplary schematic diagram of the internal circulation system of the heat pump unit according to an embodiment of the present invention is shown;

[0018] Figure 3 A schematic diagram showing the flow direction of carbon dioxide in a rotary heat exchanger according to an embodiment of the present invention is shown;

[0019] Figure 4A partially enlarged view of a rotary heat exchanger according to an embodiment of the present invention is shown. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0021] It should be understood that the terms "comprising" and "including" used in the specification and claims of this utility model indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0022] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this specification and claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0023] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0024] In existing technologies, air-source heat pumps use outdoor air as the heat source. When ambient temperatures are high, the demand for heat load at the terminal increases, while the unit's heating capacity decreases. This leads to increased energy consumption and insufficient heating in extremely low environments such as -30°C. Furthermore, the stable heating load of the air-source heat pump and the constantly changing terminal heat load demand make it difficult to achieve a balance between supply and demand at both ends due to the lack of flexibility in adjustment. This fails to meet the heating comfort needs of end users and results in energy waste.

[0025] Furthermore, there is a certain lag between the real-time indoor heating temperature and the heating load of the air source heat pump. When the heat load of the air source heat pump increases, the heat gain at the terminal is often less than the heating capacity of the unit in a short period of time. This will result in the inability to meet the real-time demand of the terminal load when the ambient temperature suddenly drops. Currently, when the unit is trying to meet the heat load demand under harsh environmental conditions, the compressor outlet temperature may become too high, causing the unit to activate overheat protection control and the system to stop operating. At this time, the heating demand at the terminal will not be met, and prolonged start-stop cycles will accelerate equipment damage. Compressor overheating also poses a safety hazard. Most current air source heat pumps use Freon refrigerants, such as R134a and R410A. These refrigerants have a high global warming potential and are somewhat detrimental to the environment.

[0026] In view of this, the present invention provides a carbon dioxide circulation scheme, which realizes carbon dioxide circulation by interconnecting the evaporator, compressor and rotary heat exchanger. By connecting the PLC frequency converter control unit to the temperature sensor, compressor and rotary heat exchanger respectively, the compressor and rotary heat exchanger can be controlled in a timely manner based on the temperature signal to meet the heating needs of the terminal and reduce energy waste.

[0027] Figure 1 An exemplary structural diagram of a carbon dioxide recycling system according to an embodiment of the present invention is shown.

[0028] like Figure 1 As shown, the carbon dioxide circulation system includes: an evaporator 1, a compressor 2, a rotary heat exchanger 3, and a PLC frequency converter control unit 4. The rotary heat exchanger 3 has a first inlet and a second inlet, and an outlet including a first outlet and a second outlet. The inlet of the compressor 2 is connected to the outlet of the evaporator 1. The first inlet of the rotary heat exchanger 3 is connected to the outlet of the compressor 2, and the first outlet of the rotary heat exchanger 3 is connected to the inlet of the evaporator 1. Temperature sensors are installed at the outlet of the evaporator 1, the outlet of the compressor 2, the second inlet of the rotary heat exchanger 3, and the outlet of the rotary heat exchanger 3. The PLC frequency converter control unit 4 is connected to the temperature sensors, the compressor 2, and the rotary heat exchanger 3, respectively.

[0029] In the embodiments of this application, by setting up the above-mentioned carbon dioxide circulation system, carbon dioxide is exchanged with cooling water to achieve end-point heating. Compared with the use of Freon working fluid in the prior art, the use of carbon dioxide can achieve green, zero-carbon, and low-cost heating.

[0030] In the embodiments of this application, the aforementioned evaporator 1 is used to absorb heat energy from the air, heat the input carbon dioxide to a superheated state, obtain low-temperature, low-pressure superheated carbon dioxide, and send the low-temperature, low-pressure superheated carbon dioxide into the compressor 2.

[0031] In the embodiments of this application, the aforementioned compressor 2 is used to compress the low-temperature, low-pressure, superheated carbon dioxide gas delivered by the evaporator 1 into high-temperature, high-pressure carbon dioxide gas. Specifically, the aforementioned compressor 2 can be a single device or multiple devices connected in parallel; this application does not impose any limitations on this. The aforementioned compressor 2 can be a variable frequency compressor, and its rotational speed frequency can be adjusted by a PLC variable frequency control unit 4 to achieve the corresponding compression requirements.

[0032] In the embodiments of this application, the aforementioned rotary heat exchanger 3 is used to utilize the centrifugal force generated by its rotation and the cooling water input to it to act on the high-temperature, high-pressure carbon dioxide gas output from the compressor 2, forming a low-temperature, low-pressure carbon dioxide gas, and then delivering the formed low-temperature, low-pressure carbon dioxide gas to the aforementioned evaporator 1. Specifically, the heat exchange requirements of the rotary heat exchanger 3 can be met by adjusting the rotational speed frequency of the rotary heat exchanger 3 through the PLC frequency conversion control unit 4.

[0033] In the embodiments of this application, internal circulation of the heat pump unit can be achieved through the evaporator 1, compressor 2, and rotary heat exchanger 3. The following is in conjunction with... Figure 2 The working principle of the internal circulation system of the heat pump unit formed by evaporator 1, compressor 2, and rotary heat exchanger 3 is described.

[0034] Figure 2 An exemplary schematic diagram of the internal circulation system of the heat pump unit according to an embodiment of the present invention is shown.

[0035] like Figure 2 As shown, during the internal circulation process of the heat pump unit, when heating, the evaporator 1 absorbs heat energy from the air, heating the input carbon dioxide to a superheated state, obtaining low-temperature, low-pressure superheated carbon dioxide, which is then sent to the compressor 2 for compression. The compressor 2 compresses the low-temperature, low-pressure superheated carbon dioxide gas from the evaporator 1 into high-temperature, high-pressure carbon dioxide gas.

[0036] Next, the high-temperature, high-pressure carbon dioxide gas from compressor 2 enters rotary heat exchanger 3. Rotary heat exchanger 3 employs a spiral structure, which is symmetrical from left to right. The carbon dioxide gas diffuses and flows from the carbon dioxide inlet... Figure 2 Starting from point a in the middle and continuing to... Figure 2At point b, the rotary heat exchanger 3 is rotating throughout the process. The centrifugal force generated by the rotation of the rotary heat exchanger 3 exerts a gravitational compression effect on the carbon dioxide gas flowing inside it. During this process, the carbon dioxide gas undergoes a compression and heating process (a→b). Simultaneously, cooling water is used to cool the carbon dioxide gas. Therefore, the rotary heat exchanger 3 exhibits an approximately isothermal compression process during the compression and heating process (a→b).

[0037] Then, carbon dioxide gas from Figure 2 point b in Figure 2 When the gas flows at point c, the centrifugal force generated by the rotation of the rotating heat exchanger 3 promotes gravitational expansion, and the carbon dioxide gas undergoes a cooling and depressurization process from b to c. Simultaneously, the cooling water continuously absorbs heat from the carbon dioxide gas, thus cooling it.

[0038] Finally, carbon dioxide gas becomes a low-temperature, low-pressure working fluid and flows out from the carbon dioxide outlet to the evaporator 1 to absorb heat energy from the air, thus completing the cycle.

[0039] Specifically, in the above cycle, the flow direction of the cooling water is opposite to the flow direction of the carbon dioxide gas, that is, from the cooling water inlet to... Figure 2 Entering at point c, flowing towards Figure 2 Point b in the middle, and then flow to Figure 2 Point a in the diagram, and finally discharged from the cooling water outlet.

[0040] By employing a spiral structure in the rotary heat exchanger 3, the conversion of centrifugal potential energy into pressure energy can be achieved. Specifically, the rotary heat exchanger 3 can... Figure 2 From point a in Figure 2 Point b in the diagram performs a secondary compression of the compressed carbon dioxide gas. This allows for a reduction in the compressor's exhaust temperature and power consumption while maintaining a stable heating output. Consequently, it effectively reduces the overall system power consumption and improves system energy efficiency. Furthermore, the rotary heat exchanger 3 can... Figure 2 From point a in Figure 2 At point b, when the compressed carbon dioxide gas undergoes a secondary compression, the pressure of the carbon dioxide gas increases, but its temperature remains approximately constant due to the cooling water. Therefore, the high-temperature resistance of the equipment and pipelines does not need to be considered throughout the process. Furthermore, when the carbon dioxide gas... Figure 2 point b in Figure 2 When the flow occurs at point c, centrifugal force promotes expansion due to gravity, causing a decrease in carbon dioxide pressure, thus achieving an expansion and depressurization effect. This eliminates the need for an expansion valve in the overall system, simplifying the system and allowing for more compact connections between system components.

[0041] Since the rotary heat exchanger 3 adopts a spiral structure, the power consumption of the compressor can be reduced, and the expansion valve is not required, thereby reducing the adverse effects of irreversible losses of the compressor and expansion valve on the cycle efficiency.

[0042] Since the rotary heat exchanger 3 replaces part of the compressor's compression function, the compressor's horsepower can be reduced during the compressor 2 selection process, thereby reducing the space occupied by the compressor 2. Furthermore, when the outlet temperature of the compressor 2 is insufficient to heat the cooling water to the required heating level, the rotational speed of the rotary heat exchanger 3 can be adjusted. Through the conversion of centrifugal potential energy to pressure energy during rotation, isothermal compression is achieved in the rotary heat exchanger, thus heating the cooling water. This protects the equipment, meets the terminal load requirements, and ultimately allows the heat pump unit to operate stably even in ultra-low temperature conditions.

[0043] Furthermore, since carbon dioxide has small molecular volume properties, it can be used as a terminal heating source by exchanging heat with cooling water. This allows the rotary heat exchanger 3 to have a smaller pipe diameter during pipe processing, which can promote the miniaturization of the system.

[0044] In the embodiments of this application, since the rotary heat exchanger 3 adopts a left-right symmetrical spiral structure, the flow direction of carbon dioxide gas, in addition to the carbon dioxide inlet described above, is as follows: Figure 2 Point a in the middle, from Figure 2 From point a in Figure 2 Point b in the middle, from Figure 2 point b in Figure 2 Point c in the middle, and from Figure 2 In the diagram, point c extends beyond the carbon dioxide inlet, and also includes the points from the carbon dioxide inlet to those described above. Figure 2 Point a in the middle Figure 2 Point B in the middle Figure 2 The flow originates at points on the other side of the rotating heat exchanger 3, corresponding to points c. That is, the carbon dioxide gas, in addition to diffusing from the carbon dioxide inlet as described above, diffuses to both sides of the rotating heat exchanger 3, and after being transported on both sides of the rotating heat exchanger 3, is output from the carbon dioxide outlet. For details of this process, please refer to [link to relevant documentation]. Figure 3 .

[0045] In the embodiments of this application, the aforementioned rotary heat exchanger 3 includes an outer tube 31 and an inner tube 32, wherein the outer tube 31 surrounds the inner tube 32 and forms a gap, as detailed in the following reference. Figure 4 .

[0046] Specifically, the aforementioned inner tube 32 serves as a channel for the flow of carbon dioxide, and the aforementioned gap serves as a channel for the flow of cooling water.

[0047] Based on the aforementioned spiral structure of the rotary heat exchanger 3, when the rotary heat exchanger 3 includes an outer tube 31 and an inner tube 32, and the inner tube 32 serves as a channel for the flow of carbon dioxide and the gap serves as a channel for the flow of cooling water, the surface area for heat exchange between the cooling water and the carbon dioxide gas can be increased, the rate of heat exchange between the cooling water and the carbon dioxide gas can be improved, and the heating efficiency can be increased.

[0048] In the embodiments of this application, the aforementioned first inlet is a carbon dioxide inlet, the aforementioned second inlet is a cooling water inlet, the aforementioned first outlet is a carbon dioxide outlet, and the aforementioned second outlet is a cooling water outlet. Since the flow direction of the cooling water is opposite to the flow direction of the carbon dioxide gas, the carbon dioxide inlet corresponds to the cooling water outlet, and the cooling water inlet corresponds to the carbon dioxide outlet.

[0049] In the embodiments of this application, a first temperature sensor 51 is provided at the outlet of the evaporator 1, a second temperature sensor 52 is provided at the outlet of the compressor 2, a third temperature sensor 53 is provided at the first outlet of the rotary heat exchanger 3, a fourth temperature sensor 54 is provided at the second inlet of the rotary heat exchanger 3, and a fifth temperature sensor 55 is provided at the second outlet of the rotary heat exchanger 3.

[0050] Specifically, the aforementioned first temperature sensor 51, second temperature sensor 52, third temperature sensor 53, fourth temperature sensor 54 and fifth temperature sensor 55 may be semiconductor temperature sensors, thermistors, etc., and this application does not impose any restrictions here.

[0051] In the embodiments of this application, the first temperature sensor 51 is used to collect the temperature signal of carbon dioxide gas at the outlet position of the evaporator 1; the second temperature sensor 52 is used to collect the temperature signal of carbon dioxide gas at the outlet position of the compressor 2; the third temperature sensor 53 is used to collect the temperature signal of carbon dioxide gas at the first outlet position of the rotary heat exchanger 3; the fourth temperature sensor 54 is used to collect the cooling water temperature signal at the second inlet position of the rotary heat exchanger 3; and the fifth temperature sensor 55 is used to collect the cooling water temperature signal at the second outlet position of the rotary heat exchanger 3.

[0052] In the embodiments of this application, the PLC frequency conversion control unit 4 includes a PLC controller 41, a disturbance signal receiver 42, a feedback signal controller 43, and a display 44, wherein the disturbance signal receiver 42, the feedback signal controller 43, and the display 44 are all connected to the PLC controller 41.

[0053] In the embodiments of this application, the connection between the disturbance signal receiver 42, the feedback signal controller 43 and the display 44 and the aforementioned PLC controller 41 can be a virtual connection or an actual connection through a connection circuit. This application does not impose any restrictions on this connection.

[0054] In the embodiments of this application, the PLC controller 41, disturbance signal receiver 42, feedback signal controller 43 and display 44 can be independent or integrated into a single integrated circuit, and this application does not impose any restrictions on this.

[0055] Specifically, the aforementioned disturbance signal receiver 42 is connected to the first temperature sensor 51, the second temperature sensor 52, the third temperature sensor 53, the fourth temperature sensor 54 and the fifth temperature sensor 55 respectively, and the feedback signal controller 43 is connected to the aforementioned compressor 2 and rotary heat exchanger 3 respectively.

[0056] In the embodiments of this application, the connection between the disturbance signal receiver 42 and each temperature sensor can be a virtual connection or an actual connection through a connection circuit, and this application does not impose any restrictions here.

[0057] In the embodiments of this application, the connection between the feedback signal controller 43 and the aforementioned compressor 2 and rotary heat exchanger 3 can be a virtual connection or an actual connection through a connection circuit, and this application does not impose any restrictions here.

[0058] In some embodiments of this application, the disturbance signal receiver 42 is used to receive temperature signals collected by the first temperature sensor 51, the second temperature sensor 52, the third temperature sensor 53, the fourth temperature sensor 54 and the fifth temperature sensor 55 respectively, and to receive outdoor real-time temperature signals, indoor real-time temperature signals and weather forecast temperature signals, and send the received signals to the PLC controller 41.

[0059] In other embodiments of this application, the disturbance signal receiver 42 may also receive other signals besides those described above, which is not limited herein.

[0060] In the embodiments of this application, the PLC controller 41 receives the signal sent by the disturbance signal receiver 42 and calculates and predicts the outlet water temperature and terminal heat load of the heat pump unit based on the corresponding algorithm stored in its internal memory. It then outputs the compressor speed signal and the rotary heat exchanger speed signal to the feedback signal controller 43. The feedback signal controller 43 adjusts the rotational speed frequencies of the compressor 2 and the rotary heat exchanger 3 to ensure that the outlet water temperature and terminal heat load of the heat pump unit quickly reach the required levels.

[0061] By monitoring the corresponding signals in real time through the disturbance signal receiver 42, the PLC controller 41 can flexibly adjust the operating conditions based on the monitoring situation, and make precise control over the heat load demand in combination with the local weather conditions. Under the premise of reducing energy waste, it can achieve stable comfort in the indoor environment of the end users, thereby achieving a balance between the heating load and the real-time changing end heat load demand.

[0062] During the calculation of terminal heat load, the PLC controller 41 combines the local real-time indoor and outdoor temperatures with the temperature forecast from the weather station to adjust the operating frequency of the unit in advance, reducing the lag in changes in operating conditions and enabling real-time response of terminal heat load to weather changes.

[0063] Through the interaction of PLC controller 41, disturbance signal receiver 42 and feedback signal controller 43, data can be monitored in real time, thereby realizing the frequency conversion control of the heat pump unit, meeting the heating needs of the terminal and reducing energy waste.

[0064] In the embodiments of this application, the PLC controller 41 can control the display 44 to display the received temperature signal and the output compressor speed signal, rotary heat exchanger speed signal, etc.

[0065] In summary, through the carbon dioxide circulation system provided above, this embodiment of the invention achieves carbon dioxide circulation by interconnecting the evaporator, compressor, and rotary heat exchanger. By connecting the PLC frequency converter control unit to the temperature sensor, compressor, and rotary heat exchanger respectively, it can control the compressor and rotary heat exchanger in a timely manner based on temperature signals, meeting the heating needs of the terminal and reducing energy waste. Furthermore, in some embodiments, by adopting a spiral structure for the rotary heat exchanger, compressor power consumption can be reduced, and an expansion valve is unnecessary, thereby mitigating the adverse effects of irreversible losses from the compressor and expansion valve on circulation efficiency.

[0066] While various embodiments of the present invention have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and intent of the present invention. It should be understood that various alternatives to the embodiments of the present invention described herein may be employed in the practice of the present invention. The appended claims are intended to define the scope of protection of the present invention and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A carbon dioxide recycling system, characterized in that, include: Evaporator (1), compressor (2), rotary heat exchanger (3) and PLC frequency conversion control unit (4), wherein the inlet of the rotary heat exchanger (3) includes a first inlet and a second inlet, and the outlet of the rotary heat exchanger (3) includes a first outlet and a second outlet; The inlet of the compressor (2) is connected to the outlet of the evaporator (1); The first inlet of the rotary heat exchanger (3) is connected to the outlet of the compressor (2), and the first outlet of the rotary heat exchanger (3) is connected to the inlet of the evaporator (1); Temperature sensors are provided at the outlet of the evaporator (1), the outlet of the compressor (2), the second inlet of the rotary heat exchanger (3), and the outlet of the rotary heat exchanger (3). The PLC frequency conversion control unit (4) is connected to the temperature sensor, the compressor (2) and the rotary heat exchanger (3) respectively.

2. The carbon dioxide recycling system according to claim 1, characterized in that, The first inlet is a carbon dioxide inlet, and the second inlet is a cooling water inlet.

3. The carbon dioxide recycling system according to claim 1 or 2, characterized in that, The first outlet is a carbon dioxide outlet, and the second outlet is a cooling water outlet.

4. The carbon dioxide recycling system according to claim 1, characterized in that, The rotary heat exchanger (3) adopts a spiral structure.

5. The carbon dioxide recycling system according to claim 4, characterized in that, The rotary heat exchanger (3) includes an outer tube (31) and an inner tube (32), the outer tube (31) surrounding the inner tube (32) and forming a gap, wherein the inner tube (32) serves as a channel for the flow of carbon dioxide and the gap serves as a channel for the flow of cooling water.

6. The carbon dioxide recycling system according to claim 4, characterized in that, The PLC frequency conversion control unit (4) includes a PLC controller (41), a disturbance signal receiver (42), a feedback signal controller (43), and a display (44), wherein the disturbance signal receiver (42), the feedback signal controller (43), and the display (44) are all connected to the PLC controller (41).

7. The carbon dioxide recycling system according to claim 6, characterized in that, The disturbance signal receiver (42) is connected to the temperature sensor.

8. The carbon dioxide recycling system according to claim 6, characterized in that, The feedback signal controller (43) is connected to the compressor (2) and the rotary heat exchanger (3) respectively.

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