Supercritical carbon dioxide compression regenerative system

Abstract

The present application relates to supercritical carbon dioxide power system technical field, provide a kind of supercritical carbon dioxide compression regenerative system, including supercritical carbon dioxide compressor, regenerator, regenerator import regulating valve, compressor drive motor, multiple densitometers, multiple pressure sensors, data processing unit.Each densitometer and pressure sensor are inserted in regenerator working medium passage, and there is measuring end directly contacted with supercritical carbon dioxide fluid.Data processing unit receives the signal transmitted by multiple densitometers and pressure sensors through cable, accurately predicts the flow and heat transfer performance of regenerator according to the preset supercritical carbon dioxide property table, and sends speed control signal to compressor drive motor according to the prediction result, and sends opening control signal to regenerator import regulating valve, significantly improves the system stability and thermal cycle efficiency of supercritical carbon dioxide compression regenerative system.

Description

Technical Field

[0001] The invention relates to the field of supercritical carbon dioxide power system technology, and in particular to a supercritical carbon dioxide compression regenerative system. Background Technology

[0002] Supercritical carbon dioxide, due to its high density-to-viscosity ratio, is very suitable as a heat exchange medium for compact heat exchangers. However, because the thermophysical properties of supercritical carbon dioxide change rapidly under different thermophysical parameters, disturbances caused by abrupt structural changes within the heat exchanger can lead to unstable regenerator performance. Therefore, accurately understanding the thermophysical properties of the working medium within the regenerator and developing a stable and efficient control strategy for a supercritical carbon dioxide compression regenerator system is of great significance. Summary of the Invention

[0003] (a) Technical problems to be solved

[0004] This invention proposes a supercritical carbon dioxide compression regenerative system to solve the problem that the rapid changes in the thermophysical properties of supercritical carbon dioxide under different thermophysical parameter conditions and the disturbances caused by abrupt structural changes in the regenerator can lead to unstable regenerator performance. The goal is to improve the stability and thermodynamic cycle efficiency of the supercritical carbon dioxide compression regenerative system.

[0005] (II) Technical Solution

[0006] A supercritical carbon dioxide compression regenerative system includes: a supercritical carbon dioxide compressor, a regenerator, a regenerator inlet regulating valve, a compressor drive motor, a flow meter, a density meter, a pressure sensor, and a data processing unit.

[0007] The regenerator is equipped with a heat source channel and a working fluid channel;

[0008] The flow meter is installed between the supercritical carbon dioxide compressor and the inlet regulating valve of the regenerator. It is connected to the outlet of the supercritical carbon dioxide compressor and the inlet of the regenerator through pipelines, and is equipped with a cable end to output measurement data.

[0009] The compressor shaft of the supercritical carbon dioxide compressor is connected to the motor shaft of the compressor drive motor via a coupling, and the speed of the supercritical carbon dioxide compressor is the same as the speed of the compressor drive motor.

[0010] The number of densitometers and pressure sensors is greater than or equal to 2. Each densitometer and pressure sensor is inserted into the working fluid channel of the regenerator. Each densitometer and each pressure sensor is equipped with a measuring end and a cable end.

[0011] The data processing unit is pre-set with a supercritical carbon dioxide thermophysical property table, a supercritical carbon dioxide flow heat transfer calculation program, a supercritical carbon dioxide compressor characteristic table, and a regenerator inlet regulating valve characteristic table. After receiving supercritical carbon dioxide density data transmitted by the densitometer and supercritical carbon dioxide pressure data transmitted by the pressure sensor, it calculates the thermophysical parameters of the regenerator working fluid channel outlet, sends an opening control signal to the regenerator inlet regulating valve, and sends a speed control signal to the compressor drive motor.

[0012] The data processing unit is equipped with a data acquisition terminal that is connected to the cable end of the densitometer and the cable end of the pressure sensor via cables, and a signal output terminal that is connected to the wiring terminals of the regenerator inlet regulating valve and the compressor drive motor via cables.

[0013] The medium flowing in the heat source channel of the regenerator is a hot fluid, and the medium flowing in the working medium channel is supercritical carbon dioxide. The inlet of the working medium channel is connected to the outlet of the flow meter through a pipeline.

[0014] The measuring ends of the densitometer and pressure sensor are in direct contact with the medium flowing in the working fluid channel, and the cable ends of the densitometer and pressure sensor are connected to the data processing unit via cables.

[0015] The thermophysical parameters of supercritical carbon dioxide at the outlet of the working fluid channel of the regenerator vary with the opening degree of the regulating valve at the inlet of the regenerator.

[0016] The data processing unit's preset supercritical carbon dioxide thermophysical property table describes the relationship between parameters such as density, pressure, temperature, specific heat, specific enthalpy, dynamic viscosity, and thermal conductivity of supercritical carbon dioxide fluid. Based on the values ​​of any two of these parameters, the values ​​of all parameters such as density, pressure, temperature, specific heat, specific enthalpy, dynamic viscosity, and thermal conductivity can be obtained.

[0017] The data processing unit's preset supercritical carbon dioxide flow heat transfer calculation program calculates the values ​​of parameters such as velocity, density, pressure, temperature, specific heat, specific enthalpy, dynamic viscosity, and thermal conductivity of the supercritical carbon dioxide fluid at the inlet of the working medium channel based on the thermophysical parameters of the hot fluid.

[0018] The data processing unit's preset characteristic table of the regenerator inlet regulating valve describes the relationship between the opening degree of the regenerator inlet regulating valve and the thermophysical parameters such as the flow rate, density, pressure, temperature, specific heat, specific enthalpy, dynamic viscosity, and thermal conductivity of supercritical carbon dioxide at the outlet of the supercritical carbon dioxide compressor and the inlet of the working fluid channel. Based on the thermophysical parameters of supercritical carbon dioxide at the inlet of the working fluid channel and the opening degree of the regenerator inlet regulating valve, the thermophysical parameters of supercritical carbon dioxide at the outlet of the supercritical carbon dioxide compressor can be obtained. When the thermophysical parameters of supercritical carbon dioxide at the outlet of the supercritical carbon dioxide compressor and the thermophysical parameters of supercritical carbon dioxide at the inlet of the working fluid channel are constant, the opening degree of the regenerator inlet regulating valve corresponding to the optimal efficiency of the supercritical carbon dioxide compressor can be calculated based on the characteristic table of the regenerator inlet regulating valve.

[0019] The data processing unit's preset supercritical carbon dioxide compressor characteristic table describes the relationship between the supercritical carbon dioxide compressor's speed, efficiency, and thermophysical parameters such as supercritical carbon dioxide flow rate, density, pressure, temperature, specific heat, specific enthalpy, dynamic viscosity, and thermal conductivity at the compressor outlet. Based on the thermophysical parameters of the supercritical carbon dioxide at the compressor outlet and the compressor's speed, the supercritical carbon dioxide compressor's efficiency can be obtained. When the thermophysical parameters of the supercritical carbon dioxide at the compressor outlet are constant, the compressor speed corresponding to the optimal efficiency can be calculated based on the supercritical carbon dioxide compressor characteristic table. When the compressor speed is constant, the thermophysical parameters of the supercritical carbon dioxide at the compressor outlet corresponding to the optimal efficiency can be calculated based on the supercritical carbon dioxide compressor characteristic table.

[0020] The opening control signal output from the signal output terminal of the data processing unit is used to control the opening of the regenerator inlet regulating valve, and the speed control signal output from the signal output terminal of the data processing unit is used to control the speed of the compressor drive motor.

[0021] (III) Technical Effects

[0022] The data processing unit receives signals transmitted via cables from multiple densitometers and pressure sensors. Based on a preset table of supercritical carbon dioxide thermophysical properties, the supercritical carbon dioxide flow heat transfer calculation program accurately predicts the flow and heat transfer performance of the regenerator. According to the prediction results, it sends speed control signals to the compressor drive motor and opening control signals to the regenerator inlet regulating valve, so that the supercritical carbon dioxide compressor operates at the optimal efficiency point, thereby improving the system stability and thermodynamic cycle efficiency of the supercritical carbon dioxide compression regenerator system. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of a supercritical carbon dioxide compression regenerative system provided in an embodiment of the present invention;

[0025] In the diagram: 1-Supercritical carbon dioxide compressor, 2-Regenerator, 3-Regenerator inlet regulating valve, 4-Compressor drive motor, 5-Flow meter, 61-First density meter, 62-Second density meter, 71-First pressure sensor, 72-Second pressure sensor, 8-Data processing unit, 9-Coupling, 101-Compressor shaft, 201-Heat source channel, 202-Working fluid channel, 31-Regenerator inlet regulating valve terminal block, 41-Motor shaft, 42-Compressor drive motor terminal block, 51-Flow meter Cable end, 611-First density meter measuring end, 612-First density meter cable end, 621-Second density meter measuring end, 622-Second density meter cable end, 711-First pressure sensor measuring end, 712-First pressure sensor cable end, 721-Second pressure sensor measuring end, 722-Second pressure sensor cable end, 811-First data acquisition end, 812-Second data acquisition end, 813-Third data acquisition end, 814-Fourth data acquisition end, 815-Fifth data acquisition end.

[0026] Figure 2 This is a schematic diagram of the workflow of a data processing unit provided in an embodiment of the present invention. Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "thermophysical properties," "pipeline," and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] The following is combined Figure 1 The supercritical carbon dioxide compression regenerative system provided in the embodiments of the present invention includes: a supercritical carbon dioxide compressor 1, a regenerator 2, a regenerator inlet regulating valve 3, a compressor drive motor 4, a flow meter 5, a first density meter 61, a second density meter 62, a first pressure sensor 71, a second pressure sensor 72, and a data processing unit 8.

[0030] The compressor shaft 101 of the supercritical carbon dioxide compressor 1 is connected to the motor shaft 41 of the compressor drive motor 4 via a coupling 9. The compressor shaft 101 of the supercritical carbon dioxide compressor 1 and the motor shaft 41 of the compressor drive motor 4 rotate at the same speed.

[0031] The regenerator 2 is provided with a heat source channel 201 and a working fluid channel 202;

[0032] The flow meter 5 is installed between the outlet of the supercritical carbon dioxide compressor 1 and the inlet regulating valve 3 of the regenerator. The flow meter 5 is connected to the outlet of the supercritical carbon dioxide compressor 1 and the inlet of the regenerator regulating valve 3 through a pipeline.

[0033] The first densitometer 61, the second densitometer 62, the first pressure sensor 71, and the second pressure sensor 72 are all inserted into the working fluid channel 202 of the regenerator 2. The first densitometer 61 is provided with a first densitometer measuring end 611 and a first densitometer cable end 612. The second densitometer 62 is provided with a second densitometer measuring end 621 and a second densitometer cable end 622. The first pressure sensor 71 is provided with a first pressure sensor measuring end 711 and a first pressure sensor cable end 712. The second pressure sensor 72 is provided with a second pressure sensor measuring end 721 and a second pressure sensor cable end 722.

[0034] The first data acquisition terminal 811 of the data processing unit 8 is connected to the cable terminal 612 of the densitometer 61 via a cable; the second data acquisition terminal 812 is connected to the cable terminal 622 of the densitometer 62 via a cable; the third data acquisition terminal 813 is connected to the cable terminal 712 of the pressure sensor 71 via a cable; the fourth data acquisition terminal 814 is connected to the cable terminal 722 of the pressure sensor 72 via a cable; and the fifth data acquisition terminal 815 is connected to the cable terminal 51 of the flow meter via a cable.

[0035] The first signal output terminal 821 of the data processing unit 8 is connected to the terminal 31 of the regenerator inlet regulating valve via a cable, and outputs an opening control signal to the regenerator inlet regulating valve 3 to control the opening of the regenerator inlet regulating valve 3. The second signal output terminal 822 is connected to the terminal 42 of the compressor drive motor via a cable, and outputs a speed control signal to the compressor drive motor 4 to control the speed of the compressor drive motor 4.

[0036] The data processing unit 8 is pre-set with a supercritical carbon dioxide thermophysical property table, a supercritical carbon dioxide flow heat transfer calculation program, and a supercritical carbon dioxide compressor characteristic table. After receiving supercritical carbon dioxide density data transmitted by the first density meter 61 and the second density meter 62 and supercritical carbon dioxide pressure data transmitted by the first pressure sensor 71 and the second pressure sensor 72, it calculates the thermophysical parameters of the working fluid channel 202 outlet of the regenerator 2, sends an opening control signal to the regenerator inlet regulating valve 3, and sends a speed control signal to the compressor drive motor.

[0037] The heat source channel 201 of the regenerator 2 contains a hot fluid, and the working medium 202 contains supercritical carbon dioxide. The inlet of the working medium channel 202 is connected to the outlet of the regenerator inlet regulating valve 3 through a pipeline.

[0038] The first density meter measuring end 611, the second density meter measuring end 621, the first pressure sensor measuring end 711, and the second pressure sensor measuring end 721 are all in direct contact with the supercritical carbon dioxide flowing medium in the working medium channel 202.

[0039] The thermophysical parameters of supercritical carbon dioxide at the inlet of working fluid channel 202 vary with the opening degree of the regenerator inlet regulating valve 3. Different opening degrees of the regenerator inlet regulating valve 3 result in different thermophysical parameters of supercritical carbon dioxide at the inlet of working fluid channel 202. The specific relationship between the opening degree and the thermophysical parameters is determined by the characteristic table of the regenerator inlet regulating valve 3.

[0040] Combination Figure 2 The workflow of data processing unit 8 is described, including the following steps:

[0041] Step S1: Receive the supercritical carbon dioxide density and pressure measured by densitometers 61 and 62 and pressure sensors 71 and 72.

[0042] Specifically, the data processing unit 8 has a preset table of supercritical carbon dioxide thermophysical properties that describes the relationship between parameters such as density, pressure, temperature, specific heat, specific enthalpy, dynamic viscosity and thermal conductivity of supercritical carbon dioxide fluid. Based on the values ​​of any two of the parameters, the values ​​of all parameters such as density, pressure, temperature, specific heat, specific enthalpy, dynamic viscosity and thermal conductivity can be obtained.

[0043] Step S2: Substitute the received density and pressure measurements into the preset supercritical carbon dioxide thermophysical property table to obtain the supercritical carbon dioxide thermophysical parameters in the working fluid channel 202.

[0044] Step S3: The preset supercritical carbon dioxide flow heat transfer calculation program reads the supercritical carbon dioxide thermophysical parameters in the working fluid channel and calculates the supercritical carbon dioxide thermophysical parameters at the inlet of the working fluid channel 202.

[0045] Specifically, the supercritical carbon dioxide flow heat transfer calculation program preset by the data processing unit 8 calculates the values ​​of parameters such as velocity, density, pressure, temperature, specific heat, specific enthalpy, dynamic viscosity and thermal conductivity of the supercritical carbon dioxide fluid at the inlet of the working fluid channel 202 based on the thermophysical parameters of the hot fluid.

[0046] Step S4: Substitute the supercritical carbon dioxide thermophysical parameters at the inlet of the working fluid channel 202 into the preset characteristic table of the regenerator inlet regulating valve to obtain the opening degree of the regenerator inlet regulating valve 3 and the supercritical carbon dioxide thermophysical parameters at the inlet of the regenerator inlet regulating valve 3.

[0047] Step S5: Send an opening control signal to the inlet regulating valve 3 of the regenerator.

[0048] Specifically, the data processing unit 8 pre-sets a characteristic table for the regenerator inlet regulating valve, which describes the relationship between the opening degree of the regenerator inlet regulating valve 3 and the supercritical carbon dioxide flow rate, density, pressure, temperature, specific heat, specific enthalpy, dynamic viscosity, and thermal conductivity at the inlet of the regenerator inlet regulating valve 3 and the working fluid channel 202. Based on the thermophysical parameters of the supercritical carbon dioxide at the inlet of the working fluid channel 202, the opening degree of the regenerator inlet regulating valve 3 and the thermophysical parameters of the supercritical carbon dioxide at the outlet of the regenerator inlet regulating valve 3 can be obtained. When the thermophysical parameters of the supercritical carbon dioxide at the inlet of the working fluid channel 202 are constant, the opening degree of the regenerator inlet regulating valve 3 corresponding to the optimal efficiency of the supercritical carbon dioxide compressor 1 can be calculated based on the characteristic table of the regenerator inlet regulating valve.

[0049] Step S6: Substitute the supercritical carbon dioxide thermophysical parameters at the outlet of the regenerator inlet regulating valve 3 into the preset supercritical carbon dioxide compressor characteristic table to obtain the speed corresponding to the optimal efficiency operating point of the supercritical carbon dioxide compressor 1.

[0050] Step S7: Send a speed control signal to the compressor drive motor 4.

[0051] Specifically, the supercritical carbon dioxide compressor characteristic table preset by the data processing unit 8 describes the relationship between the supercritical carbon dioxide compressor 1's rotational speed, supercritical carbon dioxide flow rate, density, pressure, temperature, specific heat, specific enthalpy, dynamic viscosity, and thermal conductivity, etc. Based on the supercritical carbon dioxide's thermophysical parameters and the supercritical carbon dioxide compressor 2's rotational speed, the efficiency of the supercritical carbon dioxide compressor 1 can be obtained. When the supercritical carbon dioxide compressor 1's rotational speed is constant, the thermophysical parameters of the supercritical carbon dioxide at the outlet of the supercritical carbon dioxide compressor 1 corresponding to the optimal efficiency can be calculated based on the supercritical carbon dioxide compressor 1's characteristic table.

[0052] For example, data processing unit 8 receives signals transmitted via cables from two densitometers and two pressure sensors. Based on a preset table of supercritical carbon dioxide thermophysical properties, the supercritical carbon dioxide flow heat transfer calculation program calculates the thermophysical parameters of the supercritical carbon dioxide at the inlet of the working fluid channel as follows: temperature 438.67℃, density 132.17 kg / m³. 3 The specific heat is 1.22 kJ / kg·℃, the specific enthalpy is 900.12 kJ / kg, the dynamic viscosity is 3.39E-05 Pa·s, the thermal conductivity is 0.05 W / m·℃, and the flow velocity is 12 m / s. The signal output terminal 82 sends a control signal to the inlet regulating valve 3 of the regenerator to control the opening degree at 40° and a control signal to the compressor drive motor 4 to control the speed at 26000 rpm. At this time, the supercritical carbon dioxide compressor 1 operates stably at the optimal efficiency operating point, and the operating efficiency reaches 85%.

[0053] The supercritical carbon dioxide compression regenerative system provided by this invention receives measurement signals transmitted via cables from multiple densitometers and pressure sensors through a data processing unit. Based on a preset supercritical carbon dioxide thermophysical property table, the supercritical carbon dioxide flow heat transfer calculation program accurately predicts the flow and heat transfer performance of the regenerator. According to the prediction results, it sends speed control signals to the compressor drive motor and opening control signals to the regenerator inlet regulating valve, so that the supercritical carbon dioxide compressor operates at the optimal efficiency operating point, thereby improving the system stability and thermodynamic cycle efficiency of the supercritical carbon dioxide compression regenerative system.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A supercritical carbon dioxide compression regenerative system, comprising: The supercritical carbon dioxide compressor, the regenerator, the regenerator inlet regulating valve, the compressor driving motor, the flow meter, the density meter, the pressure sensor, and the data processing unit are characterized in that the regenerator is provided with a heat source channel and a working medium channel. The flow meter is installed between the supercritical carbon dioxide compressor and the regenerator inlet regulating valve, and is connected to the outlet of the supercritical carbon dioxide compressor and the inlet of the regenerator through pipelines respectively, and is provided with a cable end to output measurement data. The compressor shaft of the supercritical carbon dioxide compressor is connected to the motor shaft of the compressor driving motor through a coupling, and the rotating speed of the supercritical carbon dioxide compressor is the same as that of the compressor driving motor. The number of the density meters and the pressure sensors is greater than or equal to 2, each density meter and pressure sensor is inserted into the working medium channel of the regenerator, and each density meter and pressure sensor is provided with a measurement end and a cable end. The data processing unit is provided with a supercritical carbon dioxide thermophysical property table, a supercritical carbon dioxide flow heat exchange calculation program, a supercritical carbon dioxide compressor characteristic table, and a regenerator inlet regulating valve characteristic table, and after receiving the supercritical carbon dioxide density data transmitted by the density meter and the supercritical carbon dioxide pressure data transmitted by the pressure sensor, the data processing unit calculates the thermophysical parameters at the outlet of the working medium channel of the regenerator, sends an opening control signal to the regenerator inlet regulating valve, and sends a rotating speed control signal to the compressor driving motor. The data processing unit is provided with a data acquisition end connected to the cable ends of the density meters and the pressure sensors through cables, and is provided with a signal output end connected to the terminal of the regenerator inlet regulating valve and the terminal of the compressor driving motor through cables. The preset regenerator inlet regulating valve characteristic table describes the relationship between the opening of the regenerator inlet regulating valve and the thermophysical parameters of the supercritical carbon dioxide at the outlet of the supercritical carbon dioxide compressor and the inlet of the working medium channel, including the flow, density, pressure, temperature, specific heat, specific enthalpy, dynamic viscosity, and thermal conductivity, and the thermophysical parameters of the supercritical carbon dioxide at the outlet of the supercritical carbon dioxide compressor can be obtained according to the thermophysical parameters of the supercritical carbon dioxide at the inlet of the working medium channel and the opening of the regenerator inlet regulating valve, and when the thermophysical parameters of the supercritical carbon dioxide at the outlet of the supercritical carbon dioxide compressor and the thermophysical parameters of the supercritical carbon dioxide at the inlet of the working medium channel are constant, the opening of the regenerator inlet regulating valve corresponding to the optimal efficiency of the supercritical carbon dioxide compressor can be calculated according to the regenerator inlet regulating valve characteristic table. The preset supercritical carbon dioxide compressor characteristic table describes the relationship between the rotating speed of the supercritical carbon dioxide compressor, the efficiency of the supercritical carbon dioxide compressor and the thermophysical parameters of supercritical carbon dioxide at the outlet of the supercritical carbon dioxide compressor, including the flow rate, the density, the pressure, the temperature, the specific heat, the specific enthalpy, the dynamic viscosity and the thermal conductivity. The efficiency of the supercritical carbon dioxide compressor can be obtained according to the thermophysical parameters of supercritical carbon dioxide at the outlet of the supercritical carbon dioxide compressor and the rotating speed of the supercritical carbon dioxide compressor. When the thermophysical parameters of supercritical carbon dioxide at the outlet of the supercritical carbon dioxide compressor are constant, the rotating speed of the supercritical carbon dioxide compressor corresponding to the optimal efficiency can be calculated according to the supercritical carbon dioxide compressor characteristic table. When the rotating speed of the supercritical carbon dioxide compressor is constant, the thermophysical parameters of supercritical carbon dioxide at the outlet of the supercritical carbon dioxide compressor corresponding to the optimal efficiency can be calculated according to the supercritical carbon dioxide compressor characteristic table.

2. The supercritical carbon dioxide compression regenerative system of claim 1, wherein, The medium flowing in the heat source channel is a thermal fluid, and the medium flowing in the working medium channel is supercritical carbon dioxide. The inlet of the working medium channel is connected to the outlet of the flow meter through a pipeline.

3. The supercritical carbon dioxide compression regenerative system of claim 1, wherein, The measuring end is directly in contact with the medium flowing in the working medium channel, and the cable end is connected to the data processing unit through a cable.

4. The supercritical carbon dioxide compression and heat recovery system according to claim 1, wherein the thermophysical parameters of supercritical carbon dioxide at the outlet of the working medium channel change with the opening degree of the inlet regulating valve of the heat recovery device.

5. The supercritical carbon dioxide compression regenerative system of claim 1, wherein, The preset supercritical carbon dioxide thermophysical property table describes the relationship between the parameters of supercritical carbon dioxide, including the density, the pressure, the temperature, the specific heat, the specific enthalpy, the dynamic viscosity and the thermal conductivity. The values of the remaining parameters can be obtained according to the values of any two parameters.

6. The supercritical carbon dioxide compression regenerative system of claim 1 or 5, wherein, The preset supercritical carbon dioxide flow heat exchange calculation program calculates the values of the parameters of supercritical carbon dioxide at the inlet of the working medium channel, including the flow rate, the density, the pressure, the temperature, the specific heat, the specific enthalpy, the dynamic viscosity and the thermal conductivity, according to the thermophysical parameters of supercritical carbon dioxide in the working medium channel.

7. The supercritical carbon dioxide compression regenerative system of claim 1 or 5, wherein, The opening degree of the inlet regulating valve of the heat recovery device is controlled by the opening degree control signal output by the signal output end, and the rotating speed of the compressor driving motor is controlled by the rotating speed control signal output by the signal output end.

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