Supercritical carbon dioxide low-energy-consumption multiple recycling system

Abstract

The utility model relates to a supercritical carbon dioxide low-energy-consumption multiple recycling system which comprises an anti-corrosion guide pipe, the inlet end of the anti-corrosion guide pipe is connected to a supercritical carbon dioxide gas blowout opening, and the outlet end of the anti-corrosion guide pipe is connected to a storage tank; a compressor assembly and a pressure pump are sequentially arranged between the inlet end of the anti-corrosion guide pipe and the outlet end of the anti-corrosion guide pipe. The compressor assembly comprises a flow divider and a flow converging device and further comprises a main pressure kettle and a secondary pressure kettle which are arranged between the flow divider and the flow converging device in parallel. The main pressure kettle comprises a front main pressure kettle and a rear main pressure kettle which are sequentially connected in series, and the secondary pressure kettle comprises a front secondary pressure kettle and a rear secondary pressure kettle which are sequentially connected in series; the front main pressure kettle, the rear main pressure kettle, the front secondary pressure kettle and the rear secondary pressure kettle are respectively connected with a compressor; according to the utility model, multi-phase coexistence and corrosion risks caused by phase state change of carbon dioxide gas in the compression process can be avoided, so that the aim of lossless recycling is fulfilled.

Description

Technical Field

[0001] The utility model relates to the technical field of petroleum on-site construction ground, in particular to a supercritical carbon dioxide low-energy consumption multiple recovery and recycling system. Background Art

[0002] Hydraulic fracturing has been widely used in the process of oil and gas production to effectively increase oil well production. However, due to the controversy over water consumption and environmental impact, hydraulic fracturing construction methods are facing more and more restrictions. Due to the requirements of the "dual carbon" goal and the popularization of the concept of water conservation, research on waterless fracturing methods has gradually deepened. At present, the use of supercritical carbon dioxide (SC-CO 2 ) as a fracturing fluid has gradually become an alternative to hydraulic fracturing. Compared with water-based fracturing fluids, the unique properties of SC-CO2 fluids help crack expansion, form complex fracture networks, and eliminate flow blockages in rock matrix and pores. 2 Fracturing technology can effectively improve oil and gas recovery

[0003] However, SC-CO 2 It is a phase change product of CO2 gas under controlled temperature and pressure conditions. That is, when the pressure is higher than the critical pressure (7.38MPa) and the temperature is higher than the critical temperature (31.4℃), CO 2 It is in the supercritical state between the gas phase and the liquid phase, showing the characteristics of high density and fast diffusion rate; but under high pressure and low temperature conditions, CO 2 It is compressed into a liquid state and is highly corrosive. When the pressure drops too quickly, the carbon dioxide changes phase, expands in volume and absorbs heat, causing CO 2 The temperature dropped sharply, forming dry ice and blocking the transport pipeline.

[0004] During the construction process on site, SC-CO is stored 2 When a tank truck transports fluid through a pipeline connected to the wellhead, the pressure difference between the tank pressure and the pipeline pressure causes SC-CO 2 The fluid undergoes phase change, and multi-state CO is formed in the pipeline 2 , which affects the fracturing operation; the conventional process uses the method of blowing into the well to release the CO 2 The gas is artificially discharged into the atmosphere, which not only poses a challenge to construction site safety, but also causes huge waste and pollution.

[0005] Therefore, there is an urgent need to develop a low-energy consumption multiple recovery and recycling system for supercritical carbon dioxide to solve the safety barriers and energy waste problems of surface emissions of supercritical carbon dioxide, and to ensure energy-saving, low-consumption and safe development of fracturing construction. Summary of the invention

[0006] The utility model aims to solve the above-mentioned problems and provides a supercritical carbon dioxide low-energy consumption multiple recovery and recycling system, which solves the problems of safety barriers and energy waste in the ground discharge of supercritical carbon dioxide. By utilizing the waste gas and phase change energy in the supercritical carbon dioxide fracturing construction process, the construction risk and cost are reduced, providing a good guarantee for the safe, efficient and low-carbon oil and natural gas engineering development.

[0007] The technical solution of the utility model is:

[0008] A supercritical carbon dioxide low-energy consumption multiple recycling and utilization system comprises an anti-corrosion conduit, the inlet end of the anti-corrosion conduit is connected to a supercritical carbon dioxide gas discharge port, and the outlet end of the anti-corrosion conduit is connected to a storage tank;

[0009] A compressor assembly and a pressure pump are arranged in sequence between the inlet end of the anti-corrosion conduit and the outlet end of the anti-corrosion conduit; the compressor assembly includes a flow divider and a flow combiner, and also includes a main pressure kettle and a secondary pressure kettle arranged in parallel between the flow divider and the flow combiner; the main pressure kettle includes a front main pressure kettle and a rear main pressure kettle connected in series in sequence, and the secondary pressure kettle includes a front secondary pressure kettle and a rear secondary pressure kettle connected in series in sequence; the front main pressure kettle, the rear main pressure kettle, the front secondary pressure kettle and the rear secondary pressure kettle are respectively connected to a compressor;

[0010] The diverter realizes the diversion function, and the concentrator realizes the converging function.

[0011] Among them, a heat exchange sleeve is also sleeved on the outside of the contact end of the anti-corrosion conduit and the supercritical carbon dioxide gas discharge port, and a hot fluid, such as low-temperature ethanol fluid, is replaced in the heat exchange sleeve; the upper and lower ends of the heat exchange sleeve are sealed by sealing flanges.

[0012] Wherein, it also includes a heat exchange unit; the heat exchange unit includes a first heat exchange tube, the inlet end of the first heat exchange tube is connected to the heat exchange sleeve, and the outlet end is respectively connected to the front main autoclave, the rear main autoclave, the front secondary autoclave and the rear secondary autoclave; it also includes a second heat exchange tube, the inlet end of the first heat exchange tube is respectively connected to the front main autoclave, the rear main autoclave, the front secondary autoclave and the rear secondary autoclave, and the outlet end is sequentially connected to a physical heat exchanger; one end of the outlet of the physical heat exchanger is connected to the cold storage transmission equipment, and the other end is connected to the heat exchange sleeve through a third heat exchange tube;

[0013] The function of the physical heat exchanger is to physically exchange heat on the low-temperature ethanol fluid. After the heat exchange, part of it enters the cold storage transmission equipment for subsequent conventional low-temperature utilization, such as room temperature adjustment; part of it passes through the physical heat exchanger for temperature compensation, and after being heated to a certain temperature, it continues to flow into the heat exchange sleeve through the third heat exchange tube, forming a cyclic heat exchange cycle.

[0014] Among them, it also includes power equipment; the power equipment includes a power turbine located in the anti-corrosion conduit, a mechanical generator and a power storage device located outside the anti-corrosion conduit and connected in sequence; the power turbine passes through the anti-corrosion conduit to be connected to the mechanical generator; the power storage device is connected to external power supply equipment.

[0015] A kinetic energy buffer is provided between the anti-corrosion conduit and the diverter, which can effectively reduce the gas flow rate and prevent excessive kinetic energy from breaking through subsequent components; a pressure pump is also provided between the confluence device and the storage tank.

[0016] Among them, it also includes an automatic control unit, which includes a master control integration and a temperature control integration and a pressure control integration respectively connected to the master control integration;

[0017] The contact end between the anti-corrosion conduit and the supercritical carbon dioxide gas discharge port is provided with a first temperature sensor and an electromagnetic pressure relief device;

[0018] A second temperature sensor is provided at the connection between the heat exchange sleeve and the first heat exchange tube and the third heat exchange tube;

[0019] Fluid check valves are provided between the flow divider and the front main autoclave / front secondary autoclave, between the front main autoclave and the rear main autoclave, and between the front secondary autoclave and the rear secondary autoclave;

[0020] The flow divider and the flow combiner both have built-in gate valves;

[0021] The front main autoclave, the rear main autoclave, the front secondary autoclave and the rear secondary autoclave are respectively provided with a pressure sensor and a pressure control device; the pressure sensor and the pressure control device are both connected to the pressure control integration;

[0022] The front main autoclave, the rear main autoclave, the front secondary autoclave and the rear secondary autoclave are respectively provided with a third temperature sensor and a temperature control device; the temperature sensor and the temperature control device are both connected to the temperature control integration;

[0023] The electromagnetic pressure relief device, the first temperature sensor, the second temperature sensor, the third temperature sensor, the pressure sensor, the fluid check valve and the gate valve are all connected to the master control integration.

[0024] The technical effects of the utility model are:

[0025] 1. The compression operation is carried out by using a split-flow cascade compression method for carbon dioxide gas. On the one hand, it can make full use of the time difference between compression and filling to prevent gas accumulation in the anti-corrosion pipe and affect subsequent blowdown operations. On the other hand, it can avoid the risk of multi-phase coexistence and corrosion caused by phase changes in carbon dioxide gas during the compression process, thereby achieving the goal of lossless recovery and reuse;

[0026] 2. The utility model is based on the multiple utilization of heat convection temperature, and uses ethanol as the heat exchange fluid to carry out convection heat exchange with the carbon dioxide after spraying. The advantages are as follows: First, after the carbon dioxide is sprayed out, it will absorb a large amount of heat in the surrounding space due to phase change, which is very easy to cause dry ice blockage due to temperature change. By increasing the initial ambient temperature of the spraying, the carbon dioxide phase change ice blockage can be effectively suppressed; second, the freezing point temperature of ethanol is -114°C, and there is a large difference between the reduction range of the carbon dioxide phase change temperature and the freezing point temperature of ethanol, which can ensure that ethanol can keep flowing in the low temperature state after the heat transfer is completed; third, low The warm ethanol fluid flows through the first heat exchange tube to the front main autoclave / rear main autoclave / front secondary autoclave / rear secondary autoclave for heat exchange. The second temperature sensor transmits the temperature information to the master control integration and controls the corresponding temperature control device to ensure the compression temperature. Fourth, the ethanol fluid after the heat exchange is completed enters the physical heat exchanger through the second heat exchange tube for heat exchange again, and transmits the low temperature to the cold storage transmission equipment to supply indoor air conditioning and other equipment. The heated ethanol fluid continues to pass through the physical heat exchanger for heating and then is injected into the heat exchange sleeve through the third heat exchange tube for circulation, thereby achieving the working purpose of low energy consumption.

[0027] 3. The utility model provides a remote-controlled electromagnetic pressure relief device for spraying operations, which can effectively avoid the danger of manual pressure operation, make full use of the kinetic energy and pressure drop of high-pressure carbon dioxide gas sprayed, drive the power turbine to achieve mechanical power generation, and can greatly alleviate the energy waste and power supply problems on the construction site. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a system connection diagram of the supercritical carbon dioxide low-energy consumption multiple recovery and recycling system of the utility model.

[0029] Figure numerals: 1. master control integration; 2. temperature control integration; 3. pressure control integration; 4. electromagnetic pressure relief device; 5. anti-corrosion duct; 6. heat exchange sleeve; 7. sealing flange; 8. power turbine; 9. first heat exchange tube; 10. kinetic energy buffer; 11. diverter; 12. front autoclave; 13. front main autoclave; 14. rear main autoclave; 15. rear autoclave; 16. concentrator; 17. booster pump; 18. storage tank; 19. mechanical generator; 20. electricity storage device; 21. physical heat exchanger; 22. cold storage transmission equipment; 23. second heat exchange tube; 24. third heat exchange tube. DETAILED DESCRIPTION

[0030] Example 1

[0031] A supercritical carbon dioxide low-energy consumption multiple recovery and recycling system comprises an anti-corrosion conduit 5, the inlet end of the anti-corrosion conduit 5 is connected to a supercritical carbon dioxide gas discharge port, and the outlet end of the anti-corrosion conduit 5 is connected to a storage tank 18; a compressor assembly and a booster pump 17 are arranged in sequence between the inlet end of the anti-corrosion conduit 5 and the outlet end of the anti-corrosion conduit 5; the compressor assembly comprises a diverter 11 and a flow combiner 16, and also comprises a main autoclave and a secondary autoclave arranged in parallel between the diverter 11 and the flow combiner 16; the main autoclave comprises a front main autoclave 13 and a rear main autoclave 14 connected in series in sequence, and the secondary autoclave comprises a front secondary autoclave 12 and a rear secondary autoclave 15 connected in series in sequence; the front main autoclave 13, the rear main autoclave 14, the front secondary autoclave 12 and the rear secondary autoclave 15 are respectively connected to a compressor; the diverter 11 realizes a diverting effect, and the flow combiner 16 realizes a converging effect.

[0032] The specific implementation process of this embodiment is as follows:

[0033] The carbon dioxide gas passes through the diverter 11 and enters the front main autoclave 13. When the gas pressure of the front main autoclave 13 reaches the set value, the carbon dioxide gas is stopped from being continuously introduced into the front main autoclave 13, and the front main autoclave 13 performs compression operation; at the same time, the carbon dioxide gas is started to be injected into the front secondary autoclave 12; when the temperature and pressure of the front main autoclave 13 reach the liquid phase condition of the carbon dioxide gas and the liquid phase is generated, the liquid phase carbon dioxide enters the rear main autoclave 14 for secondary compression, and at the same time, the carbon dioxide gas is stopped from being continuously introduced into the front secondary autoclave 12, forming a cascaded flow operation of the front main autoclave 13, the rear main autoclave 14, the front secondary autoclave 12 and the rear secondary autoclave 15; the supercritical carbon dioxide formed by the secondary compression flows into the manifold 16 through the anti-corrosion conduit 5, and the supercritical carbon dioxide enters the storage tank 18 for storage through the pressurization action of the pressure pump 17.

[0034] Example 2

[0035] On the basis of Example 1, it also includes:

[0036] A heat exchange sleeve 6 is also sleeved on the outside of the contact end of the anti-corrosion conduit 5 and the supercritical carbon dioxide gas discharge port. The heat exchange sleeve replaces hot fluid, such as low-temperature ethanol fluid; the upper and lower ends of the heat exchange sleeve are sealed by sealing flanges 7.

[0037] The specific implementation process of this embodiment is as follows:

[0038] High-pressure carbon dioxide gas is ejected. Due to the rapid decompression of carbon dioxide gas, it is very easy to produce carbon dioxide phase change to form dry ice to block the pipeline. Therefore, it is necessary to ensure the stability of carbon dioxide phase by adjusting the temperature.

[0039] The utility model adopts a convection heat exchange method, and uses the heat exchange sleeve 6 filled with ethanol as the heat exchange fluid to heat the carbon dioxide in the anti-corrosion pipe 5. The specific process is: the flow direction of ethanol is from the lower part of the heat exchange sleeve 6 to the upper part, that is, high-temperature ethanol (50-70°C) flows into the bottom of the heat exchange sleeve 6. The freezing point of ethanol is -114°C, which is lower than the temperature of dry ice, and can ensure fluidity while performing convection heat exchange.

[0040] Example 3

[0041] On the basis of Example 2, the invention further includes:

[0042] A heat exchange unit; the heat exchange unit comprises a first heat exchange tube 9, the inlet end of the first heat exchange tube 9 is connected to the heat exchange sleeve 6, and the outlet end is respectively connected to the front main autoclave 13, the rear main autoclave 14, the front secondary autoclave 12 and the rear secondary autoclave 15; and further comprises a second heat exchange tube 23, the inlet end of the first heat exchange tube 9 is respectively connected to the front main autoclave 13, the rear main autoclave 14, the front secondary autoclave 12 and the rear secondary autoclave 15, and the outlet end is sequentially connected to a physical heat exchanger 21; one end outlet of the physical heat exchanger 21 is connected to a cold storage transmission device 22, and the other end is connected to the heat exchange sleeve 6 through a third heat exchange tube 24;

[0043] The specific implementation process of this embodiment is as follows:

[0044] When the heat exchange sleeve 6 filled with ethanol has finished heat exchange (about 25-30°C), it flows to the compressor assembly;

[0045] The first heat exchange tube 9 controls the temperature of the front main autoclave 13, the rear main autoclave 14, the front secondary autoclave 12 and the rear secondary autoclave 15 respectively; the fluid after heat exchange flows out through the second heat exchange tube 23 and enters the physical heat exchanger 21;

[0046] The function of the physical heat exchanger 21 is to physically exchange heat on the low-temperature ethanol fluid. After the heat exchange, a part of it enters the cold storage transmission equipment 22 for subsequent conventional low-temperature utilization, such as room temperature adjustment, etc.; a part of it passes through the physical heat exchanger 21 for temperature compensation, and after being heated to a certain temperature, it continues to flow into the heat exchange sleeve 6 through the third heat exchange tube 24, forming a cyclic heat exchange cycle.

[0047] Example 4

[0048] On the basis of Example 3, the invention further includes:

[0049] It also includes power equipment; the power equipment includes a power turbine 8 located in the anti-corrosion conduit 5, a mechanical generator 19 and a power storage device 20 located outside the anti-corrosion conduit 5 and connected in sequence; the power turbine 8 passes through the anti-corrosion conduit 5 and is connected to the mechanical generator 19; the power storage device 20 is connected to external power supply equipment.

[0050] Example 5

[0051] On the basis of Example 4, it also includes:

[0052] A kinetic energy buffer 10 is also provided between the anti-corrosion conduit 5 and the diverter 11 , and the kinetic energy buffer 10 can effectively reduce the gas flow rate and prevent excessive kinetic energy from breaking through subsequent components; a pressure pump 17 is also provided between the confluence 16 and the storage tank 18 .

[0053] Example 6

[0054] On the basis of Example 5, the invention further comprises:

[0055] It also includes an automatic control unit, which includes a master control integration 1 and a temperature control integration 2 and a pressure control integration 3 respectively connected to the master control integration 1;

[0056] The contact end between the anti-corrosion conduit 5 and the supercritical carbon dioxide gas discharge port is provided with a first temperature sensor and an electromagnetic pressure relief device 4;

[0057] A second temperature sensor is provided at the connection between the heat exchange sleeve 6 and the first heat exchange tube 9 and the third heat exchange tube 24;

[0058] Fluid check valves are provided between the flow divider 11 and the front main autoclave 13 / front secondary autoclave 12, between the front main autoclave 13 and the rear main autoclave 14, and between the front secondary autoclave 12 and the rear secondary autoclave 15;

[0059] The flow divider 11 and the flow combiner 16 both have built-in gate valves;

[0060] The front main autoclave 13, the rear main autoclave 14, the front secondary autoclave 12 and the rear secondary autoclave 15 are respectively provided with a pressure sensor and a pressure control device; the pressure sensor and the pressure control device are connected to the pressure control integration 3;

[0061] The front main autoclave 13, the rear main autoclave 14, the front secondary autoclave 12 and the rear secondary autoclave 15 are respectively provided with a third temperature sensor and a temperature control device; the temperature sensor and the temperature control device are connected to the temperature control integration 2;

[0062] The electromagnetic pressure relief device 4 , the first temperature sensor, the second temperature sensor, the third temperature sensor, the pressure sensor, the fluid check valve and the gate valve are all connected to the master control integration 1 .

[0063] The specific implementation process of this embodiment is as follows:

[0064] When the supercritical carbon dioxide pipeline needs to be discharged, the master control integrated circuit 1 transmits a signal to the electromagnetic pressure relief device 4, and the electromagnetic pressure relief device 4 opens. The first temperature sensor installed at the discharge port transmits a signal to the master control integrated circuit 1, and the master control integrated circuit 1 adjusts the opening of the electromagnetic pressure relief device 4 according to the temperature condition, thereby adjusting the discharge volume of the carbon dioxide gas;

[0065] The temperature of carbon dioxide gas decreases after being ejected due to expansion and heat absorption. To avoid the formation of dry ice due to excessively low temperature, a heat exchange sleeve 6 filled with high-temperature ethanol fluid is installed on the outside of the anti-corrosion conduit 5 to heat the carbon dioxide to ensure its fluidity; the carbon dioxide impacts the power turbine 8 installed inside the anti-corrosion conduit 5 along the anti-corrosion conduit 5, and the power turbine 8 rotates to drive the mechanical generator 19 to generate electrical energy, which is stored and utilized by the power storage device 20;

[0066] After the carbon dioxide gas impacts the power turbine 8 to do work, it still has a large impact speed, and then flows into the kinetic energy buffer 10 to reduce the damage caused by the high kinetic energy of carbon dioxide impacting the equipment. The carbon dioxide enters the diverter 11 through the anti-corrosion conduit 5, and the gate valve inside the diverter 11 is controlled by the master control integration 1 to stop injecting gas into the front secondary autoclave 12, and at the same time, the fluid check valve between the diverter 11 and the front main autoclave 13 is opened, and the fluid check valve between the front main autoclave 13 and the rear main autoclave 14 is closed, and the carbon dioxide immediately enters the front main autoclave 13; when the gas pressure of the front main autoclave 13 reaches the set value, the master control integration 1 controls the closing of the fluid check valve between the diverter 11 and the front main autoclave 13;

[0067] The master control integrated circuit 1 controls the gate valve inside the flow divider 11 to start injecting gas into the front secondary autoclave 12, and opens the fluid check valve between the flow divider 11 and the front secondary autoclave 12. At the same time, the front main autoclave 13 and the front secondary autoclave 12 perform compression operations simultaneously;

[0068] When the temperature and pressure of the current main pressure vessel 13 reach the liquid phase conditions of the carbon dioxide gas and the liquid phase is generated, the master control integrated 1 controls to open the fluid check valve between the front main pressure vessel 13 and the rear main pressure vessel 14, and the liquid carbon dioxide enters the rear main pressure vessel 14 for secondary compression; then the master control integrated 1 controls the gate valve inside the diverter 11 to stop injecting gas into the front secondary pressure vessel 12, and then injects gas into the front main pressure vessel 13, forming a cascaded streamlined operation system with four compression vessels.

[0069] The supercritical carbon dioxide formed after compression flows into the manifold 16 through the anti-corrosion conduit 5. The manifold 16 is equipped with a gate valve for one-way flow. The supercritical carbon dioxide enters the storage tank 18 for storage through the pressurization of the pressure pump 17.

[0070] Furthermore, the high-temperature ethanol as the carbon dioxide heat exchange fluid flows upward from the bottom of the heat exchange sleeve 6, that is, flows into the high-temperature ethanol from the bottom of the heat exchange sleeve 6. When the heat exchange of the heat exchange sleeve 6 filled with high-temperature ethanol is completed, it flows through the first heat exchange tube 9 to the front main autoclave 13, the rear main autoclave 14, the front secondary autoclave 12 and the rear secondary autoclave 15. The second temperature sensor monitors the temperature thereof respectively and transmits it to the master control integration 1. The master control integration 1 controls the temperature changes of the front main autoclave 13, the rear main autoclave 14, the front secondary autoclave 12 and the rear secondary autoclave 15 in turn through the temperature control integration 2 and the temperature control device to achieve temperature adjustment and utilization;

[0071] After heat exchange, the low-temperature ethanol fluid flows out through the second heat exchange tube 23 and enters the physical heat exchanger 21. The function of the physical heat exchanger 21 is to physically heat exchange the low-temperature ethanol fluid and then enter the cold storage transmission equipment 22 for subsequent conventional low-temperature utilization, such as room temperature adjustment; the low-temperature ethanol fluid passes through the physical heat exchanger 21 for temperature compensation, and after being heated to a certain temperature, it continues to flow into the bottom of the heat exchange sleeve 6 through the third heat exchange tube 24, forming a cyclic heat exchange cycle.

[0072] Furthermore, the front main autoclave 13, the rear main autoclave 14, the front secondary autoclave 12 and the rear secondary autoclave 15 are respectively equipped with pressure sensors and pressure control devices and are connected to the master control integrated 1. When carbon dioxide enters the front main autoclave 13 / the rear main autoclave 14 / the front secondary autoclave 12 / the rear secondary autoclave 15 in different phases, the pressure control device is triggered according to a preset pressure value and the master control integrated 1 controls the operation of the pressure control device.

Claims

1. A supercritical carbon dioxide low energy consumption multiple recycling and utilization system, comprising an anti-corrosion conduit (5), the inlet end of the anti-corrosion conduit (5) is connected to a supercritical carbon dioxide gas discharge port, and the outlet end of the anti-corrosion conduit (5) is connected to a storage tank (18); characterized in that: A compressor assembly and a pressure pump (17) are arranged in sequence between the inlet end of the anti-corrosion conduit (5) and the outlet end of the anti-corrosion conduit (5); the compressor assembly comprises a flow divider (11) and a flow combiner (16), and also comprises a main pressure vessel and a secondary pressure vessel which are arranged in parallel between the flow divider (11) and the flow combiner (16); the main pressure vessel comprises a front main pressure vessel (13) and a rear main pressure vessel (14) which are connected in series in sequence, and the secondary pressure vessel comprises a front secondary pressure vessel (12) and a rear secondary pressure vessel (15) which are connected in series in sequence; the front main pressure vessel (13), the rear main pressure vessel (14), the front secondary pressure vessel (12) and the rear secondary pressure vessel (15) are respectively connected to a compressor.

2. The supercritical carbon dioxide low energy consumption multiple recycling and utilization system according to claim 1 is characterized in that: A heat exchange sleeve (6) is also sleeved on the outside of the contact end of the anti-corrosion conduit (5) and the supercritical carbon dioxide gas discharge port. The heat exchange sleeve replaces the heat fluid, and the upper and lower ends of the heat exchange sleeve are sealed by sealing flanges (7).

3. The supercritical carbon dioxide low energy consumption multiple recycling and utilization system according to claim 2 is characterized in that: The invention also comprises a heat exchange unit; the heat exchange unit comprises a first heat exchange tube (9), the inlet end of the first heat exchange tube (9) is connected to the heat exchange sleeve (6), and the outlet end is respectively connected to the front main autoclave (13), the rear main autoclave (14), the front secondary autoclave (12) and the rear secondary autoclave (15); the invention also comprises a second heat exchange tube (23), the inlet end of the second heat exchange tube (23) is respectively connected to the front main autoclave (13), the rear main autoclave (14), the front secondary autoclave (12) and the rear secondary autoclave (15), and the outlet end is connected to a physical heat exchanger (21); one end of the outlet of the physical heat exchanger (21) is connected to the cold storage transmission equipment (22), and the other end is connected to the heat exchange sleeve (6) through a third heat exchange tube (24).

4. The supercritical carbon dioxide low energy consumption multiple recycling and utilization system according to claim 3 is characterized in that: It also includes a power device; the power device includes a power turbine (8) located in the anti-corrosion conduit (5), a mechanical generator (19) and an electricity storage device (20) located outside the anti-corrosion conduit (5) and connected in sequence; the power turbine (8) passes through the anti-corrosion conduit (5) and is connected to the mechanical generator (19); the electricity storage device (20) is connected to an external device that requires power supply.

5. The supercritical carbon dioxide low energy consumption multiple recycling and utilization system according to claim 4 is characterized in that: A kinetic energy buffer (10) is also provided between the anti-corrosion conduit (5) and the flow divider (11), and a pressure pump (17) is also provided between the flow combiner (16) and the storage tank (18).

6. The supercritical carbon dioxide low energy consumption multiple recycling and utilization system according to claim 5, characterized in that: It also includes an automatic control unit, which includes a master control integration (1) and a temperature control integration (2) and a pressure control integration (3) respectively connected to the master control integration (1); The contact end between the anti-corrosion conduit (5) and the supercritical carbon dioxide gas discharge port is provided with a first temperature sensor and an electromagnetic pressure relief device (4); the connection between the heat exchange sleeve (6) and the first heat exchange tube (9) and the third heat exchange tube (24) is provided with a second temperature sensor; fluid check valves are provided between the flow divider (11) and the front main autoclave (13) / the front secondary autoclave (12), between the front main autoclave (13) and the rear main autoclave (14), and between the front secondary autoclave (12) and the rear secondary autoclave (15); the flow divider (11) and the flow combiner (16) are both equipped with built-in gate valves; The front main autoclave (13), the rear main autoclave (14), the front secondary autoclave (12) and the rear secondary autoclave (15) are respectively provided with a pressure sensor and a pressure control device; the pressure sensor and the pressure control device are both connected to the pressure control integration (3); The front main autoclave (13), the rear main autoclave (14), the front secondary autoclave (12) and the rear secondary autoclave (15) are respectively provided with a third temperature sensor and a temperature control device; the temperature sensor and the temperature control device are both connected to the temperature control integration (2); The electromagnetic pressure relief device (4), the first temperature sensor, the second temperature sensor, the third temperature sensor, the pressure sensor, the fluid check valve and the gate valve are all connected to the master control assembly (1).

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