An ultrasonic-assisted hydrothermal liquefaction apparatus and method of use thereof

Abstract

The application discloses an ultrasonic wave assisted hydrothermal liquefaction device, which comprises a tank body and a digital display control panel, the tank body is in a cylindrical shape, the inside of the tank body is hollow and the upper side of the tank body is open, a tank cover is arranged at the upper side opening of the tank body, an ultrasonic wave assembly for realizing several ultrasonic wave vibration layers in the tank body and a scraping edge rod structure for stirring and scraping the inner wall of the liquid in the tank body are arranged in the tank body respectively, a motor for driving the rotation of the ultrasonic wave assembly and the scraping edge rod structure is fixedly arranged on the tank cover, a plurality of annular heaters are arranged on the inner side of the tank body along the axial direction and are uniformly distributed, the ultrasonic wave vibration layers formed by the annular heaters and the ultrasonic wave assembly are in a spaced and intersected distribution, and under the rotation of the ultrasonic wave assembly, the liquid near the annular heaters is rapidly flowed by the multilayer ultrasonic wave vibration, and the integrated pipeline assembly is matched with the pressurization of the inside of the tank body, so that the process of hydrothermal liquefaction is greatly accelerated.

Description

Technical Field

[0001] This invention relates to the field of hydrothermal liquefaction technology, specifically to an ultrasonic-assisted hydrothermal liquefaction device and its usage method. Background Technology

[0002] Hydrothermal liquefaction is a pyrolytic process used to convert wet biomass and other polymeric materials into crude oil-like substances under moderate temperature and pressure. Also known as hydration pyrolysis, this reaction typically involves homogeneous and / or heterogeneous catalysts to improve product quality and yield. The carbon and hydrogen of organic materials, such as biomass, peat, or low-grade coal, are thermochemically converted into hydrophobic compounds with low viscosity and high solubility. Various types of biomass have been tested, ranging from forestry and agricultural residues, sewage sludge, and food processing waste to emerging non-food biomass such as algae. The composition of cellulose, hemicellulose, protein, and lignin in the raw materials affects the yield and quality of the oil in this process, such as converting pig manure into oil by heating pig manure and water. However, current hydrothermal liquefaction processes suffer from low efficiency and difficulties in overall discharge and internal cleaning. Summary of the Invention

[0003] (a) Technical problems to be solved

[0004] The purpose of this invention is to provide an ultrasonic-assisted hydrothermal liquefaction device and its usage method in order to solve the above-mentioned problems.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This invention provides an ultrasonic-assisted hydrothermal liquefaction device, comprising a tank and a digital display control panel. The tank is cylindrical in shape, hollow inside and open at the top. A tank cover is provided at the top opening of the tank. An ultrasonic component for realizing several ultrasonic vibration layers inside the tank and a scraper structure for stirring the liquid inside the tank and scraping the inner wall are respectively provided inside the tank. A motor for driving the ultrasonic component and the scraper structure to rotate is fixed on the tank cover. Several annular heaters are evenly distributed along the axial direction inside the tank. The annular heaters and the ultrasonic vibration layers of the ultrasonic component are distributed alternately.

[0008] The bottom of the tank is provided with a discharge hole, and a discharge pipe is connected to the lower opening of the discharge hole. A valve is installed on the discharge pipe. When the motor drives the scraper rod structure to rotate, the scraper rod structure realizes spiral discharge of material into the discharge hole.

[0009] The tank cover is equipped with an integrated pipe assembly that enables the filling and pressurization of the tank, the flushing of the tank, and the feeding of materials into the tank.

[0010] Furthermore, the annular heater includes an annular heat-conducting shell, the cross-sectional shape of which is an isosceles trapezoid with one end wider than the other. The wider end of the annular heat-conducting shell is connected to the inner wall of the tank. An electric heater is installed inside the annular heat-conducting shell, and the output end of the digital display control panel is electrically connected to the input end of the electric heater.

[0011] Furthermore, an annular opening groove is provided on one side of the wide end of the annular heat-conducting shell. The support frame includes two semi-circular support plates arranged at the annular opening groove. The two ends of the two support plates are arranged opposite to each other and respectively fixedly connected to support rods. The corresponding two support rods are fixedly connected to each other by connecting bolts. A bottom plate is provided below the tank. U-shaped support seats are fixedly provided on both sides of the upper part of the bottom plate and fixedly connected to the bottom of the support rods. A bottom support rod for supporting the bottom of the tank is fixedly provided on the support rod.

[0012] Furthermore, the ultrasonic component includes a central shaft located at the central axis of the tank, with several disks evenly distributed along its axial direction fixed on the central shaft. The disks are circular in shape, wider in the middle and narrower at the edges. Several ultrasonic generators are provided on the upper side of each disk, and several dials are evenly distributed around the central axis on the lower side of each disk. The output end of the digital display control panel is electrically connected to the input end of the ultrasonic generator.

[0013] Furthermore, a mounting base for fixing the motor is fixedly provided on the top side of the can lid. One end of a rotating shaft is fixedly connected to the output shaft of the motor. The other end of the rotating shaft passes through the mounting base and the can lid in sequence and extends into the can body, where it is fixedly connected to the upper end of the central shaft. The rotating shaft is rotatably connected to the mounting base through a sealed bearing. A sealing gasket is fixedly provided on the outer side of the central shaft near the top of the can lid. The sealing gasket is in movable contact with the lower side of the can lid. The cross-sectional shape of the sealing gasket is wavy. The output end of the digital display control panel is electrically connected to the input end of the motor.

[0014] Furthermore, the scraping rod structure includes a sweeping rod, the outer contour of which is consistent with the inner cross-sectional contour of the tank body. A collar is fixedly provided on the top side of the sweeping rod, and the collar is sleeved and fixed on the outside of the central shaft. A scraping brush that abuts against the inner side of the tank body is fixedly provided on the outer edge of the sweeping rod. One end of a rotating shaft is fixedly connected to the bottom of the sweeping rod, and the other end of the rotating shaft extends into the discharge hole. A spiral rib is fixedly provided on the outside of the rotating shaft located in the discharge hole. A conical collection cavity is formed on the inner bottom surface of the tank body, and the discharge hole is opened at the lowest point of the tip of the conical collection cavity.

[0015] Furthermore, the tank is equipped with a pressure sensor for detecting the internal air pressure and a level sensor for detecting the internal liquid level. The output terminals of the pressure sensor and the level sensor are electrically connected to the input terminal of the digital display control panel.

[0016] Furthermore, the integrated pipeline assembly includes a feeding cylinder fixedly mounted on the upper side of the tank cover. A gas-liquid injection pipeline structure is provided on the side wall of the feeding cylinder. A sealing cover is provided at the upper opening of the feeding cylinder. An operating handle is provided on the upper side of the sealing cover. The feeding cylinder and the tank cover are integrally formed. The lower end of the discharge pipe is connected to a first discharge pipe and a second discharge pipe respectively. A first electromagnetic three-way valve is provided at the connection between the discharge pipe, the first discharge pipe, and the second discharge pipe. The output end of the digital display control panel is electrically connected to the input end of the first electromagnetic three-way valve.

[0017] Furthermore, the gas-liquid ejection pipeline structure includes an annular nozzle arranged in a ring shape, with an annular channel inside the annular nozzle. The cross-sectional shape of the annular nozzle is an isosceles triangle. A set of nozzle holes is opened on each side of the annular nozzle, each set including several nozzle holes evenly distributed along the circumference of the annular nozzle. The two sets of nozzle holes respectively achieve directional ejection towards the inner wall of the tank and the central axis of the tank. A channel is opened on the side wall of the feeding cylinder. The lower end of the channel is connected to the annular channel through a pipe joint. The upper end of the channel is connected to one end of a first pipe. The other end of the first pipe is connected to a second pipe for introducing liquid and a third pipe for introducing gas. A second electromagnetic three-way valve is provided at the connection between the first pipe, the second pipe and the third pipe. The output end of the digital display control panel is electrically connected to the input end of the second electromagnetic three-way valve.

[0018] A method of using an ultrasonic-assisted hydrothermal liquefaction device includes the following steps:

[0019] S1: Raw materials and water are added into the tank through the integrated pipeline assembly in sequence. The raw materials are added first and then the water, so that the raw materials falling on the ring heater and ultrasonic components are washed downward and flowed down. Then the integrated pipeline assembly introduces gas into the tank to pressurize it.

[0020] S2: The motor drives the ultrasonic component and the scraper bar structure to rotate inside the tank. The ultrasonic component and the scraper bar structure work together to stir the liquid inside the tank. The ultrasonic vibration layer formed by the ring heater and the ultrasonic component is distributed in an alternating pattern. Under the rotation of the ultrasonic component, multi-layer ultrasonic vibration is achieved to make the liquid near the ring heater flow rapidly, accelerating the hydrothermal liquefaction process.

[0021] S3: After the water is liquefied, open the discharge pipe at the bottom of the tank. The discharge pipe is connected to the external pipe. Under the action of the air pressure inside the tank, the liquid inside is quickly discharged. The integrated pipe assembly continues to fill the tank with water to flush the inside of the tank.

[0022] S4: In step S3, the motor drives the scraper bar structure to rotate. During the rotation of the scraper bar structure, the inner wall of the tank is scraped and washed. Combined with the water sprayed in by the integrated pipe assembly, the inner wall of the tank is thoroughly cleaned.

[0023] (III) Beneficial Effects

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] 1. The ultrasonic vibration layer formed by the annular heater and the ultrasonic component is distributed in an alternating pattern. Under the rotation of the ultrasonic component, the multi-layer ultrasonic vibration enables the liquid near the annular heater to flow rapidly. Combined with the pressurization of the tank body by the integrated pipeline assembly, the hydrothermal liquefaction process is greatly accelerated.

[0026] 2. The scraper bar structure has two functions. The first function is to work with the ultrasonic component to mix and stir the liquid inside the tank. The second function is to scrape and wash the inner wall of the tank. Combined with the water sprayed in by the integrated pipeline component, the inner wall of the tank is thoroughly cleaned. During the rotation of the scraper bar structure, the rotating shaft drives the spiral rib to rotate in the discharge hole, which can realize spiral discharge at the discharge hole and prevent blockage.

[0027] 3. The integrated piping assembly can realize the integration of gas filling and pressurization, flushing and feeding into the tank, avoiding leakage and sealing problems caused by multiple piping installations.

[0028] 4. After the water has liquefied, open the discharge pipe at the bottom of the tank. Under the pressure of the air inside the tank, the liquid inside can be quickly discharged.

[0029] 5. The upper and lower side walls of the annular heat-conducting shell and the plate are inclined, which allows the liquid to flow from top to bottom on the outer side wall, making it easy to clean without residue. Attached Figure Description

[0030] 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 only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0032] Figure 2 This is the present invention. Figure 1 A schematic diagram of the left-side view structure;

[0033] Figure 3 This is the present invention. Figure 2 A schematic diagram of the AA cross-sectional structure;

[0034] Figure 4 This is the present invention. Figure 2 A magnified schematic diagram of the structure at point B;

[0035] Figure 5 This is the present invention. Figure 2 A magnified schematic diagram of the structure at point C;

[0036] Figure 6 This is the present invention. Figure 2 A magnified schematic diagram of the structure at point D;

[0037] Figure 7 This is the present invention. Figure 2 A magnified schematic diagram of the structure at point E;

[0038] Figure 8 This is the present invention. Figure 1 A schematic diagram of the three-dimensional structure;

[0039] Figure 9 This is the present invention. Figure 8 A magnified schematic diagram of the structure at point F.

[0040] The reference numerals in the attached drawings are explained as follows: 1. Tank body; 101. Discharge pipe; 102. Valve; 103. Tank cover; 104. Annular opening groove; 105. Discharge hole; 106. Conical collection chamber; 107. First electromagnetic three-way valve; 108. First drain pipe; 109. Second drain pipe; 2. Support frame; 201. Support plate; 202. Support rod; 203. U-shaped support seat; 204. Base plate; 205. Connecting bolt; 206. Base support rod; 3. Motor; 301. Rotating shaft; 302. Sealed bearing; 303. Mounting base; 304. Sealing gasket; 4. Integrated pipe assembly; 401. Feeding cylinder; 402. Channel; 403. Pipe joint; 404. 405. Annular nozzle; 406. Annular channel; 407. Spray hole; 408. Feeding channel; 409. Sealed chamber cover; 410. Operating handle; 411. First pipe; 412. Second pipe; 413. Third pipe; 414. Second electromagnetic three-way valve; 5. Digital display control panel; 6. Annular heater; 601. Annular heat-conducting housing; 602. Electric heater; 7. Ultrasonic assembly; 701. Central shaft; 702. Disc; 703. Ultrasonic generator; 704. Paddle plate; 8. Edge scraping rod structure; 801. Edge sweeping rod; 802. Collar; 803. Rotating shaft; 804. Spiral rib; 805. Scraper; 9. Pressure sensor; 10. Liquid level sensor. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0042] See Figure 1-9As shown, the present invention provides an ultrasonic-assisted hydrothermal liquefaction device, including a tank 1 and a digital display control panel 5. The tank 1 is cylindrical in shape, hollow inside and open at the top. A tank cover 103 is provided at the top opening of the tank 1. An ultrasonic component 7 for realizing several ultrasonic vibration layers inside the tank 1 and a scraping rod structure 8 for stirring the liquid inside the tank 1 and scraping the inner wall are respectively provided inside the tank 1. A motor 3 for driving the ultrasonic component 7 and the scraping rod structure 8 to rotate is fixedly provided on the tank cover 103. The inner side of the tank 1 along its axis The tank body 1 is provided with several evenly distributed annular heaters 6, which are spaced and interspersed with the ultrasonic vibration layer of the ultrasonic component 7; a discharge hole 105 is provided at the bottom of the tank body 1, and a discharge pipe 101 is connected to the lower opening of the discharge hole 105. A valve 102 is provided on the discharge pipe 101. When the motor 3 drives the scraper rod structure 8 to rotate, the scraper rod structure 8 realizes spiral discharge of material into the discharge hole 105; an integrated pipe assembly 4 is provided on the tank cover 103 to realize the inflation and pressurization of the tank body 1, the flushing of the tank body 1, and the feeding of material into the tank body 1.

[0043] This embodiment presents a specific annular heater 6, see the attached instruction manual. Figure 3 and 6 As shown, the annular heater 6 includes an annular heat-conducting shell 601. The cross-sectional shape of the annular heat-conducting shell 601 is an isosceles trapezoid with one end wider than the other. The wider end of the annular heat-conducting shell 601 is connected to the inner wall of the tank 1. An electric heater 602 is installed inside the annular heat-conducting shell 601. The output end of the digital display control panel 5 is electrically connected to the input end of the electric heater 602. An annular opening groove 104 is provided on one side of the wider end of the annular heat-conducting shell 601. Two semi-circular support plates 201 are provided at the annular opening groove 104. The two ends of the two support plates 201 are arranged opposite each other and respectively fixedly connected to support rods 202. The corresponding two support rods 202 are fixedly connected to each other by connecting bolts 205. A bottom plate 204 is provided below the tank 1. U-shaped support seats 203 are fixedly provided on both sides of the upper part of the bottom plate 204 and fixedly connected to the bottom of the support rods 202. A bottom support rod 206 for supporting the bottom of the tank 1 is fixedly provided on the support rods 202. Through the above-mentioned specific structural design, the upper and lower side walls of the annular heat-conducting shell 601 are both inclined, which can realize the liquid flowing from top to bottom on the outer side wall of the annular heat-conducting shell 601, and can also increase the heating contact area between the annular heat-conducting shell 601 and the liquid inside the tank 1, greatly improving the heating efficiency of the liquid inside the tank 1.

[0044] It should be noted that, in order to cooperate with the aforementioned annular heater 6, see the attached instruction manual. Figure 3 , 5As shown in Figure 6, the ultrasonic component 7 includes a central shaft 701 located at the central axis of the tank 1. Several disks 702 are uniformly distributed along the axial direction of the central shaft 701. The disks 702 are circular in shape with a wider center and narrower edges. Several ultrasonic generators 703 are provided on the upper side of each disk 702. Several levers 704 are uniformly distributed around the central axis of each disk 702. The output end of the digital display control panel 5 is electrically connected to the input end of the ultrasonic generators 703.

[0045] See instruction manual attached Figure 5 As shown, a mounting base 303 for fixing the motor 3 is fixedly installed on the top side of the can lid 103. One end of the rotating shaft 301 is fixedly connected to the output shaft end of the motor 3. The other end of the rotating shaft 301 passes through the mounting base 303 and the can lid 103 in sequence and extends into the can body 1 and is fixedly connected to the upper end of the central shaft 701. The rotating shaft 301 is rotatably connected to the mounting base 303 through a sealed bearing 302. A sealing washer 304 is fixedly installed on the outer side of the central shaft 701 near the top of the can lid 103. The sealing washer 304 is in sealing contact with the lower side of the can lid 103. The cross-sectional shape of the sealing washer 304 is wavy. The output end of the digital display control panel 5 is electrically connected to the input end of the motor 3. Through the above-mentioned specific structural design, the sealing gasket 304 can fit more tightly with the lower side of the can cover 103 under the action of the air pressure inside the can body 1, so that the sealing bearing 302 can greatly improve the sealing performance at the connection between the central shaft 701 and the can cover 103.

[0046] See instruction manual attached Figure 6 and 7 As shown, the scraping rod structure 8 includes a sweeping rod 801. The outer contour of the sweeping rod 801 is consistent with the inner cross-sectional contour of the tank body 1. A collar 802 is fixedly provided on the top side of the sweeping rod 801. The collar 802 is sleeved and fixed on the outside of the central shaft 701. A scraper 805 that abuts against the inside of the tank body 1 is fixedly provided on the outer edge of the sweeping rod 801. One end of the rotating shaft 803 is fixedly connected to the bottom of the sweeping rod 801. The other end of the rotating shaft 803 extends into the discharge hole 105. A spiral rib 804 is fixedly provided on the outside of the rotating shaft 803 located in the discharge hole 105. A conical collection cavity 106 is formed on the inner bottom surface of the tank body 1. The discharge hole 105 is opened at the lowest point of the tip of the conical collection cavity 106. In practical applications, the scraper bar structure 8 has two functions. The first function is to work with the ultrasonic component 7 to mix and stir the liquid inside the tank 1. The second function is to scrape and wash the inner wall of the tank 1, so that the inner wall of the tank 1 is cleaned.

[0047] The integrated pipeline assembly 4 includes a feeding cylinder 401 fixedly mounted on the upper side of the tank cover 103. A gas-liquid ejection pipeline structure is provided on the side wall of the feeding cylinder 401. A sealing cover 408 is provided at the upper opening of the feeding cylinder 401. An operating handle 409 is provided on the upper side of the sealing cover 408. The feeding cylinder 401 and the tank cover 103 are integrally formed. The lower end of the discharge pipe 101 is connected to a first discharge pipe 108 and a second discharge pipe 109 respectively. A first electromagnetic three-way valve 107 is provided at the connection between the discharge pipe 101, the first discharge pipe 108 and the second discharge pipe 109. The output end of the digital display control panel 5 is electrically connected to the input end of the first electromagnetic three-way valve 107. The gas-liquid ejection pipeline structure includes an annular nozzle 404 arranged in a ring shape. An annular channel 405 is formed inside the annular nozzle 404. The cross-sectional shape of the annular nozzle 404 is an isosceles triangle. A set of nozzle holes 406 is formed on each side of the annular nozzle 404. Each set includes several nozzle holes 406 evenly distributed along the circumference of the annular nozzle 404. The two sets of nozzle holes 406 respectively achieve ejection towards the inner wall of the tank 1 and the central axis of the tank 1. A channel 402 is formed on the side wall of the feeding cylinder 401. The lower end of channel 402 is connected to an annular channel 405 via pipe joint 403. The upper end of channel 402 is connected to one end of the first pipe 410. The other end of the first pipe 410 is connected to a second pipe 411 for introducing liquid and a third pipe 412 for introducing gas. A second electromagnetic three-way valve 413 is provided at the connection between the first pipe 410, the second pipe 411 and the third pipe 412. The output end of the digital display control panel 5 is electrically connected to the input end of the second electromagnetic three-way valve 413. In practical applications, by controlling and adjusting the second electromagnetic three-way valve 413 through the digital display control panel 5, the connection between the first pipe 410 and the second pipe 411, as well as the connection between the first pipe 410 and the third pipe 412, can be realized, thereby achieving the conversion of the gas-liquid channel. The two sets of spray holes 406 provided on the annular nozzle 404 can increase the cleaning range inside the tank 1 when spraying liquid. The cleaning liquid flows downward from the upper side inside the tank 1, and flows downward along the outer wall of the annular heat-conducting shell 601 and the disc 702 in sequence, realizing all-round cleaning.

[0048] The tank 1 is equipped with a pressure sensor 9 for detecting the internal air pressure and a liquid level sensor 10 for detecting the liquid level inside the tank 1. The output terminals of the pressure sensor 9 and the liquid level sensor 10 are electrically connected to the input terminal of the digital display control panel 5.

[0049] Working principle:

[0050] Raw materials and water are added to the tank 1 sequentially through the integrated pipeline assembly 4. First, the sealed cover 408 is opened to add raw materials, and then water is added through the second pipeline 411 by adjusting the second electromagnetic three-way valve 413. By adding raw materials and water in sequence, the raw materials falling on the annular heater 6 and ultrasonic component 7 can be flushed downwards and flow down. Then, nitrogen is introduced into the tank 1 through the first pipeline 410 by adjusting the second electromagnetic three-way valve 413 to pressurize it.

[0051] Motor 3 drives ultrasonic component 7 and scraper rod structure 8 to rotate inside tank 1. Ultrasonic component 7 and scraper rod structure 8 work together to stir the liquid inside tank 1. The ultrasonic vibration layer formed by the annular heater 6 and ultrasonic component 7 is distributed in an alternating pattern. Under the rotation of ultrasonic component 7, multi-layer ultrasonic vibration is achieved to make the liquid near the annular heater 6 flow rapidly. Combined with integrated pipeline component 4, the internal pressure of tank 1 is increased, accelerating the hydrothermal liquefaction process. The air pressure inside tank 1 can be detected by air pressure sensor 9, and automatic control of the air pressure inside tank 1 is achieved with digital display control panel 5.

[0052] After the water is liquefied, the discharge pipe 101 at the bottom of the tank 1 is opened. The discharge pipe 101 is connected to the first drain pipe 108 and is used to discharge the liquid. Under the action of the air pressure inside the tank 1, the liquid inside is quickly discharged. The integrated pipe assembly 4 continues to fill the tank 1 with water to flush the inside of the tank 1. The waste liquid generated by flushing can be discharged by the second drain pipe 109. The first electromagnetic three-way valve 107 can realize the connection and switching between the discharge pipe 101 and the first drain pipe 108, as well as between the discharge pipe 101 and the second drain pipe 109.

[0053] Motor 3 drives scraper rod structure 8 to rotate. During the rotation of scraper rod structure 8, the inner wall of tank 1 is scraped and washed. Combined with the water sprayed in by integrated pipe assembly 4, the inner wall of tank 1 is thoroughly cleaned. During the rotation of scraper rod structure 8, the spiral rib plate 804 can be driven to rotate in the discharge hole 105 through rotating shaft 803, so as to realize spiral discharge at discharge hole 105.

[0054] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An ultrasonic-assisted hydrothermal liquefaction device, characterized in that: The device includes a tank and a digital display control panel. The tank is cylindrical in shape, hollow inside, and open at the top. A lid is provided at the top opening of the tank. The tank contains an ultrasonic component for creating several ultrasonic vibration layers and a scraper structure for stirring the liquid inside the tank and scraping the inner wall. A motor for driving the ultrasonic component and the scraper structure is fixed on the lid. Several annular heaters are evenly distributed along the axial direction inside the tank. The annular heaters and the ultrasonic vibration layers of the ultrasonic component are distributed alternately. The bottom of the tank is provided with a discharge hole, and a discharge pipe is connected to the lower opening of the discharge hole. A valve is installed on the discharge pipe. When the motor drives the scraper rod structure to rotate, the scraper rod structure realizes spiral discharge of material into the discharge hole. The tank cover is equipped with an integrated pipe assembly that enables the inflation and pressurization of the tank, the flushing of the tank, and the feeding of materials into the tank. The annular heater includes an annular heat-conducting shell, the cross-sectional shape of which is an isosceles trapezoid with one end wider than the other. The wider end of the annular heat-conducting shell is connected to the inner wall of the tank. An electric heater is installed inside the annular heat-conducting shell, and the output end of the digital display control panel is electrically connected to the input end of the electric heater. The ultrasonic component includes a central shaft located at the central axis of the tank. Several disks are evenly distributed along the central shaft. The disks are circular in shape, wider in the middle and narrower at the edges. Several ultrasonic generators are provided on the upper side of each disk. Several dials are evenly distributed around the central axis on the lower side of each disk. The output of the digital display control panel is electrically connected to the input of the ultrasonic generator. The scraping rod structure includes a sweeping rod, the outer contour of which is consistent with the inner cross-sectional contour of the tank body. A collar is fixedly installed on the top side of the sweeping rod, and the collar is sleeved and fixed on the outside of the central shaft. A scraping brush that abuts against the inner side of the tank body is fixedly installed on the outer edge of the sweeping rod. One end of a rotating shaft is fixedly connected to the bottom of the sweeping rod, and the other end of the rotating shaft extends into the discharge hole. A spiral rib is fixedly installed on the outside of the rotating shaft located in the discharge hole. A conical material collection cavity is formed on the inner bottom surface of the tank body, and the discharge hole is opened at the lowest point of the tip of the conical material collection cavity.

2. The ultrasonic-assisted hydrothermal liquefaction device according to claim 1, characterized in that: The annular heat-conducting shell has an annular opening groove on one side of its wide end. The support frame includes two semi-circular support plates set at the annular opening groove. The two ends of the two support plates are arranged opposite to each other and are respectively fixedly connected to support rods. The corresponding two support rods are fixedly connected to each other by connecting bolts. A bottom plate is set at the bottom of the tank. U-shaped support seats are fixedly set on both sides of the upper part of the bottom plate and are fixedly connected to the bottom of the support rods. A bottom support rod for supporting the bottom of the tank is fixedly set on the support rod.

3. The ultrasonic-assisted hydrothermal liquefaction device according to claim 1, characterized in that: A mounting base for fixing the motor is fixedly installed on the top side of the can lid. One end of the rotating shaft is fixedly connected to the output shaft of the motor. The other end of the rotating shaft passes through the mounting base and the can lid in sequence and extends into the can body, where it is fixedly connected to the upper end of the central shaft. The rotating shaft is rotatably connected to the mounting base through a sealed bearing. A sealing washer is fixedly installed on the outer side of the central shaft near the top of the can lid. The sealing washer and the lower side of the can lid are in sealing contact. The cross-sectional shape of the sealing washer is wavy. The output end of the digital display control panel is electrically connected to the input end of the motor.

4. The ultrasonic-assisted hydrothermal liquefaction device according to claim 1, characterized in that: The tank is equipped with a pressure sensor for detecting the internal air pressure and a liquid level sensor for detecting the internal liquid level. The output terminals of the pressure sensor and the liquid level sensor are electrically connected to the input terminal of the digital display control panel.

5. The ultrasonic-assisted hydrothermal liquefaction device according to claim 1, characterized in that: The integrated pipeline assembly includes a feeding cylinder fixedly mounted on the upper side of the tank cover. A gas-liquid ejection pipeline structure is provided on the side wall of the feeding cylinder. A sealing cover is provided at the upper opening of the feeding cylinder. An operating handle is provided on the upper side of the sealing cover. The feeding cylinder and the tank cover are integrally formed. The lower end of the discharge pipe is connected to a first discharge pipe and a second discharge pipe respectively. A first electromagnetic three-way valve is provided at the connection between the discharge pipe, the first discharge pipe and the second discharge pipe. The output end of the digital display control panel is electrically connected to the input end of the first electromagnetic three-way valve.

6. The ultrasonic-assisted hydrothermal liquefaction device according to claim 5, characterized in that: The gas-liquid ejection pipeline structure includes an annular nozzle in the shape of a ring, with an annular channel inside the annular nozzle. The cross-sectional shape of the annular nozzle is an isosceles triangle. A set of nozzle holes is opened on each side of the annular nozzle. Each set includes several nozzle holes evenly distributed along the circumference of the annular nozzle. The two sets of nozzle holes respectively achieve directional ejection towards the inner wall of the tank and the central axis of the tank. A channel is opened on the side wall of the feeding cylinder. The lower end of the channel is connected to the annular channel through a pipe joint. The upper end of the channel is connected to one end of a first pipe. The other end of the first pipe is connected to a second pipe for introducing liquid and a third pipe for introducing gas. A second electromagnetic three-way valve is provided at the connection between the first pipe, the second pipe and the third pipe. The output end of the digital display control panel is electrically connected to the input end of the second electromagnetic three-way valve.

7. A method of using an ultrasonic-assisted hydrothermal liquefaction device, comprising the ultrasonic-assisted hydrothermal liquefaction device as described in any one of the preceding claims, characterized in that: Includes the following steps: S1: Raw materials and water are added into the tank through the integrated pipeline assembly in sequence. The raw materials are added first and then the water, so that the raw materials falling on the ring heater and ultrasonic components are washed downward and flowed down. Then the integrated pipeline assembly introduces gas into the tank to pressurize it. S2: The motor drives the ultrasonic component and the scraper bar structure to rotate inside the tank. The ultrasonic component and the scraper bar structure work together to stir the liquid inside the tank. The ultrasonic vibration layer formed by the ring heater and the ultrasonic component is distributed in an alternating pattern. Under the rotation of the ultrasonic component, multi-layer ultrasonic vibration is achieved to make the liquid near the ring heater flow rapidly, accelerating the hydrothermal liquefaction process. S3: After hydrothermal liquefaction is complete, open the discharge pipe at the bottom of the tank. The discharge pipe is connected to the external pipe. Under the action of the air pressure inside the tank, the liquid inside is quickly discharged. The integrated pipe assembly continues to fill the tank with water to flush the inside of the tank. S4: In step S3, the motor drives the scraper bar structure to rotate. During the rotation of the scraper bar structure, the inner wall of the tank is scraped and washed. Combined with the water sprayed in by the integrated pipe assembly, the inner wall of the tank is thoroughly cleaned.

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