Equipment for improving supercritical CO2 extraction efficiency of plant solid powder

Abstract

The utility model discloses equipment for improving supercritical CO2 extraction efficiency of plant solid powder, which comprises a raw material screw conveyor, a vertical extraction kettle, an annular supercritical CO2 annular steam pocket and a raffinate screw conveyor, wherein the volume of the vertical extraction kettle can reach hundred cubic meters, and the withstanding pressure of the vertical extraction kettle is 20-45MPa. A material turning system capable of lifting materials upwards from the bottom is arranged in the extraction kettle, a supercritical CO2 annular steam pocket which is in a sleeved state relative to the extraction kettle is located on the lower side of the extraction kettle, and a plurality of supercritical CO2 steam inlet pipes which are communicated with the supercritical CO2 annular steam pocket and the extraction kettle extend into pipeline parts of an inner cavity of the extraction kettle to be opened downwards. The supercritical CO2 fluid entering the inner cavity of the extraction kettle downwards impacts the bottom of the inner cavity of the extraction kettle and then reversely flows upwards. The extraction kettle disclosed by the utility model is large in volume and can be elastically adjusted, the extraction efficiency is improved by 30%, the operation time is saved by about 1 / 4-1 / 3, and the production automation can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of supercritical CO2 extraction, in particular to a device for improving the efficiency of supercritical CO2 extraction of plant solid powder. Background Art

[0002] Existing supercritical CO2 extraction equipment for plant solid powder generally uses a basket-type extraction kettle. Due to the limitation of the overall structure, the volume of this extraction kettle is relatively small (a few liters to hundreds of liters). The largest basket-type extraction kettle currently is manufactured by Aerospace Wujiang, with a volume of 5m 3 The loading and unloading of the basket-type extraction kettle requires steps such as opening the cover, lifting the basket, and dumping. This has low production efficiency, easily generates dust in the production environment, and is difficult to achieve production automation, resulting in low production efficiency.

[0003] On the other hand, due to the structure of the basket-type extraction kettle, it is prone to channeling during extraction. The CO2 superfluid flows along the small resistance gap in the middle, and the material near the container wall and the CO2 superfluid cannot fully contact each other, resulting in uneven extraction of the material in the container and low extraction efficiency. This is also the reason why the basket-type extraction kettle cannot be manufactured into large-volume equipment and cannot achieve large-scale production. Utility Model Content

[0004] The purpose of the utility model is to provide a device for improving the efficiency of supercritical CO2 extraction of plant solid powder in response to the problems existing in the prior art.

[0005] The purpose of this utility model is solved by the following technical solutions:

[0006] A device for improving the efficiency of supercritical CO2 extraction of plant solid powder is characterized in that: the device includes a raw material screw conveyor, a vertical extraction kettle with a volume of up to 100 cubic meters and a pressure resistance of 20-45MPa, an annular supercritical CO2 annular steam drum, and a residue screw conveyor. The extraction kettle is provided with a turning system capable of lifting the material from the bottom upward. The supercritical CO2 annular steam drum is nested relative to the extraction kettle and is located on the lower side of the extraction kettle. Multiple supercritical CO2 steam inlet pipes connecting the supercritical CO2 annular steam drum and the extraction kettle extend into the inner cavity of the extraction kettle, and the openings of the pipelines are arranged downward, so that the supercritical CO2 fluid entering the inner cavity of the extraction kettle hits the bottom of the inner cavity of the extraction kettle downward and then flows upward in the opposite direction.

[0007] In order to ensure the safety of use and current manufacturing capacity, the recommended volume of the extraction kettle is 10-50m 3 .

[0008] The supercritical CO2 steam inlet pipes are evenly distributed along the circumference of the extraction kettle body, and the number of the supercritical CO2 steam inlet pipes is more than three. A supercritical CO2 mixing outlet is provided on the top of the extraction kettle body.

[0009] The bottom of the extraction kettle has a conical bottom, and the pipeline portion of the supercritical CO2 steam inlet pipe extending into the inner cavity of the extraction kettle is inclined downward along the inclined surface of the conical bottom, and the outlet of the supercritical CO2 steam inlet pipe is higher than the position of the supercritical CO2 annular steam drum.

[0010] The material turning system includes a motor reducer, a transmission shaft, a shaft bracket, a coupling, a spiral blade shaft, a spiral blade and a shaft lower bracket. The bottom of the spiral blade shaft with spiral blades is installed on the shaft lower bracket, and the top is connected to the bottom of the transmission shaft through a coupling. The transmission shaft installed on the shaft bracket passes through the top of the extraction kettle body upward and is connected to the output end of the motor reducer.

[0011] The transmission shaft is connected to the top of the extraction kettle body by adopting a dynamic seal.

[0012] A raw material high-pressure airtight cabin is arranged on the top head of the extraction kettle, and the raw material high-pressure airtight cabin is connected to the inner cavity of the extraction kettle through a pipeline with a feed high-pressure valve. The raw material high-pressure airtight cabin is also connected to the raw material temporary storage bin through a pipeline with a feed high-pressure valve. The inlet of the raw material temporary storage bin is located at the bottom of the outlet of the closed raw material screw conveyor.

[0013] The raw material high-pressure airtight cabin is connected to the supercritical CO2 annular steam drum through a supercritical CO2 steam supply pipe with a cabin high-pressure air inlet valve; the raw material high-pressure airtight cabin is provided with a cabin decompression and exhaust valve, so that the CO2 gas recovery compressor is used to decompress and exhaust the raw material high-pressure airtight cabin.

[0014] A raffinate high-pressure airtight cabin is arranged at the bottom of the extraction kettle. The raffinate high-pressure airtight cabin is connected to the inner cavity of the extraction kettle through a pipeline with a raffinate cabin high-pressure valve, and the raffinate high-pressure airtight cabin is connected to a star-shaped discharger through a pipeline with a discharge high-pressure valve. The outlet of the star-shaped discharger is located above the inlet of the closed raw material screw conveyor.

[0015] The extract high-pressure airtight cabin is connected to the supercritical CO2 annular steam drum through a supercritical CO2 steam supply pipe with an extract cabin high-pressure air inlet valve; the extract high-pressure airtight cabin is provided with an extract cabin decompression and exhaust valve, so that the extract high-pressure airtight cabin is decompressed and exhausted by using a CO2 gas recovery compressor.

[0016] The extraction kettle body is wrapped with a hot water jacket, and the hot water inlet and the hot water outlet of the hot water jacket are respectively located at the bottom and the upper part of the extraction kettle body.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] The recommended volume of the extraction kettle of this utility model is 10-50m 3 The multi-point air intake method of the supercritical CO2 annular drum can adjust the volume according to needs; the supercritical CO2 fluid input into the extraction kettle adopts a downward-then-up operation mode and adopts a high-pressure spiral turning method, which increases the extraction efficiency by 30% and saves about 1 / 4-1 / 3 of the operation time; the raw material feeding and the discharge of the residue under high pressure state improve the safety of production, realize automated production, and reduce the occurrence of work-related accidents; at the same time, less labor is used, saving about 1 / 2 of the wage cost.

[0019] The utility model is designed with a high-pressure airtight chamber for raw materials and a high-pressure airtight chamber for extract residue, which can feed raw materials into the extraction kettle and remove extract residue during extraction; and both raw materials and extract residue are transported by a closed conveying mechanism, without dust, and the production environment is clean and tidy, which can realize production automation and greatly improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Attachment Figure 1 This is a schematic diagram of the structure of the equipment provided by the utility model for improving the efficiency of supercritical CO2 extraction of plant solid powder;

[0021] Attachment Figure 2 For attachment Figure 1 Schematic diagram of the AA cross-section structure in.

[0022] Among them: 1—raw material screw conveyor; 2—raw material temporary storage bin; 3—feed high-pressure valve; 4—raw material high-pressure airtight cabin; 5—feed high-pressure valve; 6—supercritical CO2 steam supply pipe; 7—tank high-pressure air inlet valve; 8—supercritical CO2 annular steam drum; 9—raffinate screw conveyor; 10—star-shaped discharger; 11—discharge high-pressure valve; 12—raffinate high-pressure airtight cabin; 13—raffinate cabin high-pressure air inlet valve; 14—raffinate cabin pressure reduction and exhaust valve; 15—raffinate cabin high-pressure valve; 16—shaft lower bracket; 17—supercritical CO2 steam inlet pipe; 18—extraction kettle body; 19—hot water jacket; 20—spiral blade; 21—spiral blade shaft; 22—coupling; 23—shaft bracket; 24—drive shaft; 25—supercritical CO2 mixed gas outlet; 26—motor reducer; 27—tank pressure reduction and exhaust valve. DETAILED DESCRIPTION

[0023] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Like reference numerals in the figures represent like or similar structures, and thus their detailed description will be omitted.

[0024] The terms "a", "an", "the", and "said" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to express an open-ended inclusive meaning and mean that additional elements / components / etc. may be present in addition to the listed elements / components / etc.

[0025] like Figure 1-2 The figure shows an apparatus for improving the efficiency of supercritical CO2 extraction of plant solid powder. The apparatus comprises a raw material screw conveyor 1, a vertical extraction kettle with a volume of 100 cubic meters and a pressure resistance of 20-45 MPa, an annular supercritical CO2 annular steam drum 8, and a raffinate screw conveyor 9. The extraction kettle body 18 of the extraction kettle is wrapped with a hot water jacket 19, and the hot water inlet and hot water outlet of the hot water jacket 19 are respectively located at the bottom and the top of the extraction kettle body 18; a material turning system is arranged in the extraction kettle to lift the material from the bottom upward. The supercritical CO2 annular steam drum 8, which is in a nested state relative to the extraction kettle, is located on the lower side of the extraction kettle. Multiple supercritical CO2 steam inlet pipes 17 connecting the supercritical CO2 annular steam drum 8 and the extraction kettle extend into the inner cavity of the extraction kettle, and the openings of the pipes are arranged downward, so that the supercritical CO2 fluid entering the inner cavity of the extraction kettle hits the bottom of the inner cavity of the extraction kettle downward and then flows upward in the opposite direction. The supercritical CO2 fluid passes upward through the continuously turning raw materials, fully contacts with the raw materials, breaks the wall, and transfers mass to extract the essence, and finally overflows from the supercritical CO2 mixed gas outlet 25 to go to the separator for separation.

[0026] On the basis of the above structure, multiple supercritical CO2 steam inlet pipes 17 are evenly distributed along the circumference of the extraction kettle body 18, and the number of supercritical CO2 steam inlet pipes 17 is more than three. At the same time, a supercritical CO2 mixed gas outlet 25 is provided on the top head of the extraction kettle body 18; the bottom of the extraction kettle has a conical bottom (cone angle of 30°-45°), and the pipeline portion of the supercritical CO2 steam inlet pipe 17 extending into the inner cavity of the extraction kettle is inclined downward along the inclined surface of the conical bottom, and the outlet of the supercritical CO2 steam inlet pipe 17 is higher than the position of the supercritical CO2 annular steam drum 8.

[0027] On the basis of the above structure, the turning system includes a motor reducer 26, a transmission shaft 24, a shaft bracket 23, a coupling 22, a spiral blade shaft 21, a spiral blade 20 and a lower shaft bracket 16. The bottom of the spiral blade shaft 21 on which the spiral blade 20 is arranged is installed on the lower shaft bracket 16, and the top is connected to the bottom of the transmission shaft 24 through the coupling 22. The transmission shaft 24 installed on the shaft bracket 23 passes upward through the top of the extraction kettle body 18 and is connected to the output end of the motor reducer 26; the transmission shaft 24 and the top of the extraction kettle body 18 are connected by a dynamic seal.

[0028] On the basis of the above structure, a raw material high-pressure airtight cabin 4 is arranged on the top head of the extraction kettle. The raw material high-pressure airtight cabin 4 is connected to the inner cavity of the extraction kettle through a pipeline with a feed high-pressure valve 5, and the raw material high-pressure airtight cabin 4 is connected to the raw material temporary storage warehouse 2 through a pipeline with a feed high-pressure valve 3. The inlet of the raw material temporary storage warehouse 2 is located at the bottom of the outlet of the closed raw material screw conveyor 1; the raw material high-pressure airtight cabin 4 is connected to the supercritical CO2 annular steam drum 8 through a supercritical CO2 steam supply pipe 6 with a cabin high-pressure air inlet valve 7; the raw material high-pressure airtight cabin 4 is provided with a cabin decompression and exhaust valve 27, so that the CO2 gas recovery compressor is used to decompress and exhaust the raw material high-pressure airtight cabin 4.

[0029] On the basis of the above structure, a raffinate high-pressure airtight cabin 12 is arranged at the bottom of the extraction kettle. The raffinate high-pressure airtight cabin 12 is connected to the inner cavity of the extraction kettle through a pipeline with a raffinate high-pressure valve 15, and the raffinate high-pressure airtight cabin 12 is connected to the star-shaped discharger 10 through a pipeline with a discharge high-pressure valve 11. The outlet of the star-shaped discharger 10 is located above the inlet of the closed raw material screw conveyor 1; the raffinate high-pressure airtight cabin 12 is connected to the supercritical CO2 annular steam drum 8 through a supercritical CO2 steam supply pipe 6 with a raffinate high-pressure air inlet valve 13; the raffinate high-pressure airtight cabin 12 is provided with a raffinate decompression and exhaust valve 14, so that the raffinate high-pressure airtight cabin 12 is decompressed and exhausted by a CO2 gas recovery compressor.

[0030] The following is a further explanation of a device for improving the efficiency of supercritical CO2 extraction of plant solid powder provided by the utility model through specific embodiments.

[0031] The utility model provides a device for improving the efficiency of supercritical CO2 extraction of plant solid powder. Figure 1-2As shown, the equipment for improving the efficiency of supercritical CO2 extraction of plant solid powder includes an extraction kettle system, a supercritical CO2 fluid circulation system, a material turning system, an extraction kettle feeding system, and an extraction kettle residue removal system. Among them, the extraction kettle system is composed of the extraction kettle body 18 and the hot water jacket 19; the supercritical CO2 fluid circulation system is composed of the supercritical CO2 annular steam drum 8, the supercritical CO2 steam inlet pipe 17 and the supercritical CO2 mixed gas outlet 25; the turning system is composed of the motor reducer 26, the transmission shaft 24, the shaft bracket 23, the coupling 22, the spiral blade shaft 21, the spiral blade 20 and the lower shaft bracket 16; the extraction kettle feeding system is composed of the raw material screw conveyor 1, the raw material temporary storage bin 2, the feeding high-pressure valve 3, the raw material high-pressure airtight cabin 4, the feed high-pressure valve 5, the material cabin high-pressure air inlet valve 7 and the material cabin decompression and exhaust valve 27; the extraction kettle residue removal system is composed of the residue screw conveyor 9, the star-shaped discharger 10, the discharge high-pressure valve 11, the residue high-pressure airtight cabin 12, the residue cabin high-pressure air inlet valve 13, the residue cabin decompression and exhaust valve 14 and the residue cabin high-pressure valve 15.

[0032] The following describes in detail a device for improving the efficiency of supercritical CO2 extraction of plant solid powder provided by the utility model by further explaining the operating principles of each part.

[0033] The operating principle of the extraction kettle system is as follows: there is a hot water inlet at the bottom of the extraction kettle and a hot water outlet at the top. The process temperature of the extraction kettle is maintained at 33-55°C by circulating hot water and controlling the hot water flow. At the same time, the strength of the extraction kettle must ensure that it can withstand a pressure of 20-45MPa. In addition, the tapered bottom of the extraction kettle body 18 facilitates the removal of residual extract.

[0034] The operating principle of the supercritical CO2 fluid circulation system is as follows: the supercritical CO2 fluid coming out of the booster pump enters the supercritical CO2 annular steam drum 8, and then enters the inner cavity of the extraction kettle through the supercritical CO2 steam inlet pipe 17 arranged at multiple points (not limited to 3 points). The outlet of the supercritical CO2 steam inlet pipe 17 is inclined downward along the inclined surface of the conical bottom of the extraction kettle. The supercritical CO2 fluid hits the kettle floor to form a reverse uniform airflow that passes upward through the continuously turning raw materials. The supercritical CO2 fluid fully contacts the raw materials, breaks the wall, and transfers mass to produce the extraction essence. The extraction essence overflows from the supercritical CO2 mixed gas outlet 25 and goes to the separator for separation.

[0035] The operating principle of the material turning system is as follows: During the extraction process, the motor reducer 26 maintains a rotational speed of approximately 5-8 rpm, driving the drive shaft 24, coupling 22, and spiral blade shaft 21. Coupling 22 connects the drive shaft 24 and spiral blade shaft 21 using a double cross slider, effectively eliminating eccentricity between the drive shaft 24 and spiral blade shaft 21. The lower portion of the spiral blade shaft 21 is supported by the lower support 16. As the spiral blade shaft 21 rotates clockwise, the right-handed spiral blade 20 lifts the raw material powder from the bottom along the spiral blade 20 upward. Simultaneously, the raw material powder on the inner wall of the extraction kettle falls down to replenish the lifted raw material powder, forming a material turning cycle and avoiding the formation of channeling caused by the raw material powder remaining stationary in the basket-type extraction kettle.

[0036] The operating principle of the extraction kettle feeding system is as follows: before the start of each production stage, when the extraction kettle is pressure-free, the feed high-pressure valve 3 and the feed high-pressure valve 5 are opened, and the raw materials are fed into the extraction kettle by the raw material screw conveyor 1. At this time, the high-pressure air inlet valve 7 and the decompression and exhaust valve 27 of the material tank are closed. During the extraction process, when the extraction kettle is under high pressure, while the feed high-pressure valve 5, the high-pressure air inlet valve 7 and the decompression and exhaust valve 27 of the material tank are closed, the feed high-pressure valve 3 is opened to fill the raw material high-pressure airtight compartment 4 with raw materials. The feed high-pressure valve 3 is then closed, and the feed high-pressure valve 5 and the high-pressure air inlet valve 7 of the material tank are opened. After all the raw materials have entered the extraction kettle, the feed high-pressure valve 5 and the high-pressure air inlet valve 7 of the material tank are closed. The decompression and exhaust valve 27 of the material tank is then opened, and the CO2 gas recovery compressor recovers the CO2 in the high-pressure airtight compartment 4 of the raw materials to the CO2 intermediate storage tank. This completes one cycle, and the above steps are repeated in a cycle to achieve high-pressure continuous feeding of the extraction kettle.

[0037] The operating principle of the raffinate removal system is as follows: when a production stage is completed and the pressure of the extraction kettle is emptied, the raffinate high-pressure valve 15, the discharge high-pressure valve 11, and the star-shaped discharger 10 can be directly opened, and the raffinate screw conveyor 9 transports the raffinate to the warehouse; when the extraction kettle is in the extraction process and there is high pressure in the extraction kettle, the process is opposite to the feeding system. When the raffinate high-pressure valve 15, the discharge high-pressure valve 11, and the raffinate pressure relief valve 14 are closed, the raffinate high-pressure air inlet valve 13 is opened to ensure that the raffinate high-pressure airtight compartment 12 has pressure to prevent CO2 from mixing with high-pressure materials. The extract suddenly decompresses and freezes, causing blockage. Subsequently, the extract tank high-pressure valve 15 is opened. After the extract fills the extract high-pressure airtight compartment 12, the extract tank high-pressure valve 15 and the extract tank high-pressure air inlet valve 13 are closed. Then the discharge high-pressure valve 11 and the star-shaped discharger 10 are opened. The extract is transported to the warehouse by the extract screw conveyor 9. After the extract high-pressure airtight compartment 12 is emptied, the discharge high-pressure valve 11 and the star-shaped discharger 10 are closed. Then the extract tank decompression exhaust valve 14 is opened. The CO2 in the extract high-pressure airtight compartment 12 is recovered by the CO2 gas recovery compressor to the CO2 intermediate storage tank. This completes a cycle. By repeating the above steps, the extract can be continuously discharged at high pressure from the extraction kettle.

[0038] The related operations of the feeding system and the raffinate discharge system are kept consistent. Since the volumes of the raw material high-pressure airtight cabin 4 and the raffinate high-pressure airtight cabin 12 are equal, the feeding and discharge can be done simultaneously by controlling the valves.

[0039] The extraction kettle provided by the utility model adopts the structure of a vertical pressure vessel. The volume can reach 100 cubic meters according to the design and manufacturing capacity. However, in order to ensure the safety of use and the current manufacturing capacity, the recommended volume is 10-50m3. 3 , which solves the pain point of the small volume of the basket-type extraction kettle; the spiral blades 20 arranged in the extraction kettle can continuously lift the powder from the bottom along the spiral blades 20 to the highest position, and at the same time, the powder around the inner wall of the extraction kettle falls with gravity, gathers at the bottom and is lifted by the spiral blades 20 again, and continuously reciprocates, so that the extracted powder is evenly in contact with the supercritical CO2 fluid; and considering the increase in volume, the supercritical CO2 annular steam drum 8 is adopted in the form of air intake of the extraction kettle to supply supercritical CO2 fluid, and multiple air inlets (at least 3 points) are used to feed supercritical CO2 fluid. After the supercritical CO2 steam inlet pipe 17 is inserted into the extraction kettle, it goes downward along the cone bottom, so that the supercritical CO2 fluid recoils upward, disrupting the single flow direction of the supercritical CO2 fluid, which can effectively avoid channeling and make the extraction uniform.

[0040] In the embodiments of the present invention, the term "plurality" refers to two or more, unless otherwise specified. Terms such as "installed," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection. Those skilled in the art will understand the specific meanings of these terms in the embodiments of the present invention based on the specific circumstances.

[0041] In the description of the embodiments of the present invention, it is necessary to understand that the terms "upper" and "lower" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the embodiments of the present invention.

[0042] Throughout this specification, terms such as "one embodiment" and "a preferred embodiment" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0043] The above embodiments are only for illustrating the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the present invention; any technology not involved in the present invention can be realized by existing technology.

Claims

1. A device for improving the efficiency of supercritical CO2 extraction of plant solid powder, characterized by: The equipment comprises a raw material screw conveyor (1), a vertical extraction kettle with a volume of 100 cubic meters and a pressure resistance of 20-45 MPa, an annular supercritical CO2 annular steam drum (8), and an extract screw conveyor (9). The extraction kettle is provided with a material turning system capable of lifting the material from the bottom upwards. The supercritical CO2 annular steam drum (8) is arranged in a nested state relative to the extraction kettle and is located at the lower side of the extraction kettle. A plurality of supercritical CO2 steam inlet pipes (17) connecting the supercritical CO2 annular steam drum (8) and the extraction kettle extend into the inner cavity of the extraction kettle, and the openings of the pipes are arranged downwards, so that the supercritical CO2 fluid entering the inner cavity of the extraction kettle hits the bottom of the inner cavity of the extraction kettle downwards and then flows in the reverse direction upwards.

2. The device for improving the efficiency of supercritical CO2 extraction of plant solid powder according to claim 1, characterized in that: The supercritical CO2 steam inlet pipes (17) are evenly distributed along the circumference of the extraction kettle body (18), and the number of the supercritical CO2 steam inlet pipes (17) is more than three. A supercritical CO2 mixing outlet (25) is provided at the top of the extraction kettle body (18).

3. The device for improving the efficiency of supercritical CO2 extraction of plant solid powder according to claim 1, characterized in that: The bottom of the extraction kettle has a conical bottom, and the pipe portion of the supercritical CO2 steam inlet pipe (17) extending into the inner cavity of the extraction kettle is inclined downward along the inclined surface of the conical bottom, and the outlet of the supercritical CO2 steam inlet pipe (17) is higher than the position of the supercritical CO2 annular steam drum (8).

4. The device for improving the efficiency of supercritical CO2 extraction of plant solid powder according to claim 1, characterized in that: The material turning system comprises a motor reducer (26), a transmission shaft (24), a shaft bracket (23), a coupling (22), a spiral blade shaft (21), a spiral blade (20) and a shaft lower bracket (16). The bottom of the spiral blade shaft (21) on which the spiral blade (20) is arranged is mounted on the shaft lower bracket (16), and the top is connected to the bottom of the transmission shaft (24) through the coupling (22). The transmission shaft (24) mounted on the shaft bracket (23) passes upward through the top of the extraction kettle body (18) and is connected to the output end of the motor reducer (26).

5. The device for improving the efficiency of supercritical CO2 extraction of plant solid powder according to claim 4, characterized in that: The transmission shaft (24) is connected to the top of the extraction kettle body (18) by a dynamic seal.

6. The device for improving the efficiency of supercritical CO2 extraction of plant solid powder according to any one of claims 1 to 5, characterized in that: A raw material high-pressure airtight cabin (4) is arranged on the top cover of the extraction kettle. The raw material high-pressure airtight cabin (4) is connected to the inner cavity of the extraction kettle through a pipeline with a feed high-pressure valve (5). The raw material high-pressure airtight cabin (4) is also connected to the raw material temporary storage bin (2) through a pipeline with a feed high-pressure valve (3). The inlet of the raw material temporary storage bin (2) is located at the bottom of the outlet of the closed raw material screw conveyor (1).

7. The device for improving the efficiency of supercritical CO2 extraction of plant solid powder according to claim 6, characterized in that: The raw material high-pressure airtight cabin (4) is connected to the supercritical CO2 annular steam drum (8) through a supercritical CO2 steam supply pipe (6) with a cabin high-pressure air inlet valve (7); the raw material high-pressure airtight cabin (4) is provided with a cabin decompression and exhaust valve (27) for decompressing and exhausting the raw material high-pressure airtight cabin (4).

8. The device for improving the efficiency of supercritical CO2 extraction of plant solid powder according to any one of claims 1 to 5, characterized in that: A raffinate high-pressure airtight cabin (12) is arranged at the bottom of the extraction kettle. The raffinate high-pressure airtight cabin (12) is connected to the inner cavity of the extraction kettle through a pipeline with a raffinate high-pressure valve (15), and the raffinate high-pressure airtight cabin (12) is connected to a star-shaped discharger (10) through a pipeline with a discharge high-pressure valve (11). The outlet of the star-shaped discharger (10) is located above the inlet of the closed raw material screw conveyor (1).

9. The device for improving the efficiency of supercritical CO2 extraction of plant solid powder according to claim 8, characterized in that: The extract high-pressure airtight cabin (12) is connected to the supercritical CO2 annular steam drum (8) via a supercritical CO2 steam supply pipe (6) having an extract cabin high-pressure air inlet valve (13); the extract high-pressure airtight cabin (12) is provided with an extract cabin decompression and exhaust valve (14) for decompressing and exhausting the extract high-pressure airtight cabin (12).

10. The device for improving the efficiency of supercritical CO2 extraction of plant solid powder according to claim 2, characterized in that: The extraction kettle body (18) is wrapped with a hot water jacket (19), and the hot water inlet and the hot water outlet of the hot water jacket (19) are respectively located at the bottom and the top of the extraction kettle body (18).

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