A method for continuous hydrothermal liquefaction of biomass at high water content to produce oil

Abstract

This invention relates to the field of biomass energy utilization technology and discloses a continuous hydrothermal liquefaction method for producing oil from high-moisture-content biomass. The method includes the following steps: adding biomass material into a tank for heating and pressurization, and stirring the biomass material using a stirring mechanism to accelerate its decomposition; simultaneously, the stirring mechanism scrapes off tar adhering to the inner wall of the tank and extracts gas above the oil surface inside the tank, injecting it into the biomass material at the bottom of the tank to generate bubbles, mimicking water boiling to assist in stirring the biomass material. This invention, by setting up a stirring mechanism to stir the biomass material, enables rapid decomposition and oil precipitation from the biomass. Simultaneously, the stirring of the biomass material and the scraping off of tar adhering to the inner wall of the tank prevent tar accumulation from clogging the oil flow channels, thus increasing the stability of the biomass-to-oil production process.

Description

Technical Field

[0001] This invention relates to the field of biomass energy utilization technology, specifically a method for continuous hydrothermal liquefaction of high-moisture-content biomass to produce oil. Background Technology

[0002] Continuous hydrothermal liquefaction of high-moisture-content biomass is used to perform hydrothermal liquefaction treatment on high-moisture-content biomass, meeting the raw material conversion needs of bio-oil production and ensuring the orderly operation of bio-oil preparation.

[0003] Patent application CN201910665260.3 discloses a device and method for continuous hydrothermal liquefaction of biomass to produce biocrude oil, including a dual hydraulic cylinder feeding system, a material mixing tank, a preheating reactor, a hydrothermal liquefaction reactor, a product collection vessel, a back pressure valve, a filter, a gas-liquid-oil separator, a circulating water pipeline, and control components.

[0004] However, in the continuous hydrothermal liquefaction process of biomass with high water content, the viscous tar produced by the decomposition of biomass materials is easily condensed and adheres to the inner wall of the equipment, which narrows the oil flow channel, causes pipeline blockage, and increases maintenance costs. Summary of the Invention

[0005] The purpose of this invention is to provide a continuous hydrothermal liquefaction method for producing oil from biomass with high water content, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a method for continuous hydrothermal liquefaction of high-moisture-content biomass to produce oil, comprising the following steps: S1. The biomass material is put into the tank, heated and pressurized, and stirred by a stirring mechanism to accelerate the decomposition rate of the biomass material. S2. While stirring the biological material inside the tank, the stirring mechanism scrapes off the tar adhering to the inner wall of the tank, extracts the gas above the oil surface inside the tank, and injects it into the biological material at the bottom of the tank to generate bubbles, mimicking the boiling of water to assist in stirring the biological material. S3. During the decomposition process, the biological material guides the generated water and flows back from the top of the inner wall of the tank to flow downward along the inner wall of the tank. After softening the tar adhering to the inner wall of the tank, it is scraped off by the cleaning mechanism and squeezed into small pieces. S4. The oil produced after the decomposition of biomass materials is separated into layers by vibration, water and biomass materials, and the oil is extracted and then refined.

[0007] According to the above technical solution, the stirring mechanism includes a scraper, the outer wall of which contacts the inner wall of the tank, for stirring the biological material inside the tank while scraping off the tar adhering to the inner wall. A support rod is fixedly connected to the inner wall of the scraper, which supports the scraper. A sliding sleeve is slidably connected to the outer wall of the support rod, and a counterweight is fixedly connected to the outer wall of the sliding sleeve. The counterweight drives the sliding sleeve to slide on the outer wall of the support rod by gravity.

[0008] According to the above technical solution, a guide groove is provided on the outer wall of the support rod, and the guide groove is spirally formed on the outer wall of the support rod. A suction rod is slidably connected to the inner wall of the support rod. The outer wall of the suction rod is fixedly connected to the inner wall of the sliding sleeve through the guide groove via a slider. A second guide hole is provided on the outer wall of the support rod, and the second guide hole is used to guide the gas inside the tank to the inside of the support rod. A second scraper is fixedly connected to the end of the counterweight away from the sliding sleeve. The second scraper is used to clean the tar adhering to the outer wall of the support rod when the sliding sleeve slides on the outer wall of the support rod.

[0009] According to the above technical solution, a drive rod is rotatably connected to the inner wall of the tank via a bearing. The drive rod is driven to rotate by a motor installed on the outer wall of the tank. One end of the support rod near the drive rod is fixedly connected to the outer wall of the drive rod. A fixed shaft is fixedly connected to the inner wall of the tank. The fixed shaft is installed inside the drive rod and is used to support the drive rod.

[0010] According to the above technical solution, the outer wall of the drive rod is provided with a sliding groove one, the outer wall of the fixed shaft is provided with a circulation groove two, the outer wall of the scraper one is provided with a sliding groove three, the wall of the sliding groove three is slidably connected to an arc-shaped plate by a slider, the outer wall of the arc-shaped plate is fixedly connected to a cleaning block one, the outer wall of the cleaning block one is used to scrape off the tar adhering to the outer wall of the scraper one, the arc-shaped plate slides along the sliding groove three for stirring the biological material, and the inner wall of the arc-shaped plate is fixedly connected to a stirring blade for stirring the biological material.

[0011] According to the above technical solution, a second support rod is fixedly connected to the inner wall of the arc plate, and a guide block is fixedly connected to the end of the second support rod away from the arc plate. The inner wall of the guide block slides along the outer wall of the drive rod. The inner wall of the guide block is slidably connected to the wall of the second circulation groove through a slider penetrating the first sliding groove. The second circulation groove is used to guide the guide block and drive the guide block to slide back and forth along the wall of the first sliding groove.

[0012] According to the above technical solution, a diversion plate is fixedly connected to the inner wall of the tank, a circulation groove 1 is formed on the outer wall of the fixed axis, and a sliding groove 2 is formed on the outer wall of the fixed axis. The cleaning mechanism includes a sliding sleeve. The inner wall of the sliding sleeve is slidably connected to the wall of the circulation groove 1 through a slider passing through the sliding groove 2. The circulation groove 1 guides the sliding sleeve to slide back and forth along the wall of the sliding groove 2. A support rod 3 is fixedly connected to the outer wall of the sliding sleeve. A cleaning block 2 is fixedly connected to the end of the support rod 3 away from the sliding sleeve. The outer wall of the cleaning block 2 contacts the inner wall of the tank and is used to scrape off the tar adhering to the inner wall of the tank. A baffle is slidably connected to the inner wall of the cleaning block 2. The baffle is used to block the tar scraped off by the cleaning block 2 on the inner wall of the tank. An elastic push rod is fixedly connected to the outer wall of the cleaning block 2. The output end of the elastic push rod is fixedly connected to the outer wall of the baffle. The elastic push rod is used to support the baffle, so that the baffle protrudes from the outer wall of the cleaning block 2.

[0013] According to the above technical solution, a vibrating block is slidably connected to the inner wall of the drive rod, and a spring is fixedly connected to the inner wall of the vibrating block. The other end of the spring is fixedly connected to the inner wall of the drive rod. A groove is provided on the outer wall of the fixed axis. The vibrating block is supported by the spring and enters the groove. The drive rod rotates to make the vibrating block squeeze the spring and slide on the inner wall of the drive rod, which beats the oil, causing the oil to separate and stratify. The middle section of the inner wall of the tank is convex, and the inclined surface of the inner wall is used to intercept solid biomaterials. A guide hole is provided on the inner wall of the tank. A return pipe is fixedly connected inside the tank. The return pipe is used to guide the water produced by biomass decomposition and return it from the top of the inner wall of the tank through the guide hole. The water flows down the inner wall of the tank to wash away the tar and soften it. A pump is installed on the outer wall of the return pipe to extract the water produced by biomass decomposition.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention uses a stirring mechanism to stir the biomaterial, enabling the biomaterial to decompose rapidly and precipitate oil. At the same time, the stirring of the biomaterial also scrapes off the tar adhering to the inner wall of the tank, preventing tar accumulation from clogging the oil flow channel and increasing the stability of oil production from the biomaterial.

[0015] 2. The present invention uses a stirring mechanism to perform radial stirring of the biological material while simultaneously performing axial stirring of the biological material, thereby making the decomposition of the biological material more uniform and increasing the decomposition efficiency of the biological material.

[0016] 3. In this invention, during the stirring process of the biological material, air is extracted from the inside of the tank and pushed out into the biological material, so that the biological material mimics the boiling state of water during the heating and decomposition process, thereby assisting in the stirring of the biological material and increasing the decomposition efficiency of the biological material.

[0017] 4. This invention cleans the tar adhering to the inner wall of the tank during oil transportation by setting up a cleaning mechanism, and collects the tar. After the tar agglomerates, the agglomerates are squeezed to break them down into smaller pieces, preventing large tar pieces from accumulating and causing blockage of the oil passage, and increasing the stability of bio-oil production.

[0018] 5. This invention, by setting up a vibrating block that can beat the oil through vibration, causes the oil to separate and stratify from the water and biological materials during the static sedimentation process, preventing the oil from mixing with the water and biological materials and thus avoiding waste. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ; Figure 2 This is a cross-sectional view of the tank body of the present invention; Figure 3 This is a schematic diagram of the structure of the present invention. Figure 2 ; Figure 4 This is a schematic diagram of the structure of the drive rod of the present invention; Figure 5 This is a cross-sectional view of the drive rod of the present invention; Figure 6 This is a schematic diagram of the stirring mechanism of the present invention. Figure 1 ; Figure 7 This is a schematic diagram of the stirring mechanism of the present invention. Figure 2 ; Figure 8 This is a schematic diagram of the cleaning mechanism of the present invention.

[0020] In the diagram: 100, Tank body; 101, Diverter plate; 102, Drive rod; 103, Return pipe; 104, Guide hole one; 105, Fixed shaft; 106, Vibrating block; 107, Sliding groove one; 108, Sliding groove two; 109, Spring; 110, Groove; 111, Circulation groove one; 112, Circulation groove two; 200, Stirring mechanism; 201, Scraper one; 202, Support rod one; 203, Sliding sleeve; 2 04. Guide groove; 205. Counterweight block; 206. Scraper II; 207. Sliding groove III; 208. Arc plate; 209. Cleaning block I; 210. Stirring blade; 211. Support rod II; 212. Guide block; 213. Suction rod; 214. Flow guide hole II; 300. Cleaning mechanism; 301. Cleaning block II; 302. Baffle; 303. Support rod III; 304. Sliding sleeve; 305. Elastic push rod. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1, please refer to Figures 1-4 and Figures 6-7 The present invention provides a technical solution: a method for continuous hydrothermal liquefaction of high-moisture-content biomass to produce oil, comprising the following steps: S1. The biomass material is put into the tank 100, heated and pressurized, and stirred by the stirring mechanism 200 to accelerate the decomposition rate of the biomass material. S2. While stirring the biological material inside the tank 100, the stirring mechanism 200 scrapes off the tar adhering to the inner wall of the tank 100, extracts the gas above the oil surface inside the tank 100, and injects it into the biological material at the bottom of the tank 100 to generate bubbles, mimicking the boiling of water to assist in stirring the biological material. S3. During the decomposition process, the biological material guides the generated water and flows back from the top of the inner wall of the tank 100 to flow downward along the inner wall of the tank 100. After softening the tar adhering to the inner wall of the tank 100, it is scraped off by the cleaning mechanism 300 and squeezed into small pieces. S4. The oil produced after the decomposition of biomass materials is separated into layers with water and biomaterials by vibration. After the oil is extracted, the oil refining is completed. In the continuous hydrothermal liquefaction oil production process of high-moisture-content biomass, the viscous tar produced by the decomposition of biomass materials is easily condensed and adheres to the inner wall of the equipment, causing narrowing of the oil flow channel, pipeline blockage, and increased maintenance costs. Therefore, a stirring mechanism 200 is set up to stir the biomass, enabling the biomass to decompose rapidly and precipitate oil. At the same time, the stirring mechanism 200 scrapes off the tar adhering to the inner wall of the tank 100 to prevent tar accumulation from blocking the oil flow channel and to increase the stability of biomass oil production. Simultaneously, the stirring mechanism 200 performs radial and axial stirring of the biomass, making the decomposition of the biomass more uniform and increasing the decomposition efficiency. During the stirring process of the biomass, the stirring mechanism 200 also extracts air from inside the tank 100 and pushes it out inside the biomass, so that the biomass simulates the boiling state of water during the heating and decomposition process, which assists in stirring the biomass and increases the decomposition efficiency. The stirring mechanism 200 includes a scraper 201, the outer wall of which contacts the inner wall of the tank 100. This scraper stirs the biological material inside the tank 100 while simultaneously scraping off tar adhering to the inner wall. A support rod 202 is fixedly connected to the inner wall of the scraper 201, supporting it. A sliding sleeve 203 is slidably connected to the outer wall of the support rod 202, and a counterweight 205 is fixedly connected to the outer wall of the sliding sleeve 203. The counterweight 205 drives the sliding sleeve 203 to slide on the outer wall of the support rod 202 by gravity. A guide groove 204, spirally formed, is provided on the outer wall of the support rod 202. A suction rod 213 is slidably connected to the inner wall of the support rod 202. The outer wall of the suction rod 213 is fixedly connected to the inner wall of the sliding sleeve 203 via a slider passing through a guide groove 204. A guide hole 214 is provided on the outer wall of the support rod 202 to guide the gas inside the tank 100 into the support rod 202. A scraper 206 is fixedly connected to the end of the counterweight 205 away from the sliding sleeve 203. The scraper 206 is used to clean the tar adhering to the outer wall of the support rod 202 when the sliding sleeve 203 slides on the outer wall of the support rod 202. A drive rod 102 is rotatably connected to the inner wall of the tank 100 via a bearing. The drive rod 102 is provided on the outer wall of the tank 100. The motor drives the rotation. Support rod 1 202 is fixedly connected to the outer wall of drive rod 102 at one end. A fixed shaft 105 is fixedly connected to the inner wall of tank 100, located inside drive rod 102, and supports drive rod 102. A sliding groove 107 is formed on the outer wall of drive rod 102. A circulation groove 112 is formed on the outer wall of fixed shaft 105. A sliding groove 207 is formed on the outer wall of scraper 1 201. An arc-shaped plate 208 is slidably connected to the wall of sliding groove 207 via a slider. A cleaning block 209 is fixedly connected to the outer wall of arc plate 208, and the outer wall of cleaning block 209 is used to clean the tar adhering to the outer wall of scraper 1 201. The process involves scraping, with the arc-shaped plate 208 sliding along the sliding groove 207 to stir the biological material. A stirring blade 210 is fixedly connected to the inner wall of the arc-shaped plate 208, which is used to stir the biological material. A support rod 211 is fixedly connected to the inner wall of the arc-shaped plate 208, and a guide block 212 is fixedly connected to the end of the support rod 211 away from the arc-shaped plate 208. The inner wall of the guide block 212 slides along the outer wall of the drive rod 102. The inner wall of the guide block 212 is slidably connected to the wall of the circulation groove 112 through the sliding groove 107 via a slider. The circulation groove 112 is used to guide the guide block 212, driving the guide block 212 to slide back and forth along the wall of the sliding groove 107. When the biomaterial is added to the tank 100 for decomposition and oil refining, the motor installed on the outer wall of the tank 100 drives the drive rod 102 to rotate. The drive rod 102 drives the scraper 201 to rotate on the inner wall of the tank 100 via the support rod 202, stirring the biomaterial and scraping off the tar adhering to the inner wall of the tank 100 to prevent tar from causing blockage of the oil passage. During the rotation of the drive rod 102 and the scraper 201, when the drive rod 102 rotates to the highest point inside the tank 100, the counterweight 205 drives the sliding sleeve 203 to slide away from the scraper 201 on the outer wall of the support rod 202 by gravity, and passes through the spiral guide groove 204. The guide rotates on the outer wall of support rod 202, causing counterweight 205 to drive scraper 206 to rotate on the outer wall of support rod 202, scraping off the tar adhering to the outer wall of support rod 202. As counterweight 205 drives sliding sleeve 203 to slide away from scraper 201 on the outer wall of support rod 202, sliding sleeve 203 drives suction rod 213 to slide on the inner wall of support rod 202, guiding and sucking the gas in tank 100 through guide hole 214 into the interior of support rod 202. When support rod 202 rotates to the lowest point inside tank 100 driven by drive rod 102, counterweight 205 drives sliding sleeve 203 to rotate on the outer wall of support rod 202. 2. The outer wall slides towards scraper 201, causing the sliding sleeve 203 to drive the suction rod 213 to slide towards scraper 201, pushing the air drawn from the tank 100 into the biomaterial. This prevents the counterweight 205 from falling too quickly. Simultaneously, the gas pushed out from inside the support rod 202 can mimic the boiling state of water to assist in stirring the biomaterial, increasing its decomposition rate. The drive rod 102 drives the scraper 201 to rotate on the inner wall of the tank 100 via the support rod 202, while simultaneously rotating on the outer wall of the fixed axis 105. This causes the guide block 212 to be guided through the circulation groove 112 and simultaneously guided through the sliding groove 107. The drive rod 102 slides back and forth on the outer wall, causing the drive rod 102 to drive the arc plate 208 through the support rod 211 and slide along the wall of the sliding groove 207. The arc plate 208 rotates inside the tank 100 through the support rod 211 and the guide block 212, and moves back and forth along the axis of the drive rod 102 on the inner wall of the tank 100. The arc plate 208 drives the stirring blade 210 to fully stir the biological material inside the tank 100, increasing the decomposition rate of the biological material. While the biological material is being stirred and decomposed inside the tank 100, the inclined surface protruding on the inner wall of the tank 100 intercepts the biological material, reducing the impurities carried by the oil after it is separated and transported.

[0023] Example 2, based on Example 1, please refer to... Figure 8 The present invention provides a technical solution: a diversion plate 101 is fixedly connected to the inner wall of the tank body 100, a circulation groove 111 is opened on the outer wall of the fixed shaft 105, and a sliding groove 108 is opened on the outer wall of the fixed shaft 105. In the continuous hydrothermal liquefaction oil production process of high-moisture biomass, the viscous tar produced by the decomposition of biomass materials is easily condensed and adheres to the inner wall of the equipment, which narrows the oil flow channel, causes pipeline blockage, and increases maintenance costs. Therefore, a cleaning mechanism 300 is set up to clean the tar adhering to the inner wall of the tank 100 during the oil transportation process and collect the tar. After the tar agglomerates, the agglomerates are squeezed to break the tar into small pieces, preventing large pieces of tar from accumulating and causing oil circuit blockage, and increasing the stability of bio-oil production. The cleaning mechanism 300 includes a sliding sleeve 304. The inner wall of the sliding sleeve 304 is slidably connected to the wall of the circulation tank 111 via a slider passing through the sliding groove 2 108. The circulation tank 111 guides the sliding sleeve 304 to reciprocate along the wall of the sliding groove 2 108. A support rod 303 is fixedly connected to the outer wall of the sliding sleeve 304. A cleaning block 2 301 is fixedly connected to the end of the support rod 303 away from the sliding sleeve 304. The outer wall of the cleaning block 2 301 is flush with the inner wall of the tank 100. The contact is used to scrape off the tar adhering to the inner wall of the tank 100. A baffle 302 is slidably connected to the inner wall of the cleaning block 301. The baffle 302 is used to block the tar scraped off by the cleaning block 301 on the inner wall of the tank 100. An elastic push rod 305 is fixedly connected to the outer wall of the cleaning block 301. The output end of the elastic push rod 305 is fixedly connected to the outer wall of the baffle 302. The elastic push rod 305 is used to support the baffle 302, so that the baffle 302 protrudes from the outer wall of the cleaning block 301. The oil flows away from the stirring mechanism 200 along the protrusions on the inner wall of the tank 100. After impurities are intercepted by the diversion plate 101, it enters the oil flow channel on the protrusions of the inner wall of the tank 100. At the same time, during the rotation of the drive rod 102, the sliding sleeve 304 is limited by the sliding groove 108, so that the drive rod 102 drives the sliding sleeve 304 to rotate on the inner wall of the tank 100 through the sliding groove 108. At the same time, the sliding sleeve 304 is guided by the circulation groove 111, and the drive rod 102 drives the sliding sleeve 304 to slide back and forth on the outer wall of the drive rod 102. The sliding sleeve 304 drives the cleaning block 301 to slide on the inner wall of the tank 100 through the support rod 303. The cleaning block 301 is used to scrape off the tar adhering to the inner wall of the tank 100. At the same time, the scraped tar is supported by the baffle 302, which protrudes from the outer wall of the cleaning block 301 to intercept the tar. The tar agglomerates on the outer wall of the baffle 302 and slides through the sliding sleeve 304 and the support rod 303 to contact the outer wall of the diversion plate 101. The diversion plate 101 supports the baffle 302 and squeezes the elastic push rod 305 to slide away from the diversion plate 101 on the inner wall of the cleaning block 301. The cleaning block 301 and the diversion plate 101 work together to squeeze the tar and break it into small pieces, preventing large pieces of tar from clogging the oil flow channel.

[0024] Example 3, based on Examples 1 and 2, please refer to... Figure 5 The present invention provides a technical solution: a vibration block 106 is slidably connected to the inner wall of the drive rod 102; In the continuous hydrothermal liquefaction oil production process of high water content biomass, the viscous tar produced by the decomposition of biomass materials is easy to condense and adhere to the inner wall of the equipment, which leads to narrowing of the oil flow channel, causing pipeline blockage and increasing maintenance costs. Therefore, a vibrating block 106 is installed to beat the oil through vibration, so that the oil is separated from the water and biological materials and separated into layers during the static sedimentation process, preventing the oil from mixing with the water and biological materials and failing to be separated, thus avoiding waste. A spring 109 is fixedly connected to the inner wall of the vibrating block 106. The other end of the spring 109 is fixedly connected to the inner wall of the drive rod 102. A groove 110 is provided on the outer wall of the fixed shaft 105. The vibrating block 106 is supported by the spring 109 and enters the groove 110. The rotation of the drive rod 102 causes the vibrating block 106 to squeeze the spring 109 and slide it on the inner wall of the drive rod 102, thus agitating the oil and causing it to separate and stratify. The middle section of the inner wall of the tank 100 is convex, and the inclined surface of the inner wall is used for... Solid biomaterials are used for interception. A guide hole 104 is provided on the inner wall of the tank 100. A return pipe 103 is fixedly connected inside the tank 100. The return pipe 103 is used to guide the water produced by biomass decomposition and return it from the top of the inner wall of the tank 100 through the guide hole 104. The water flows down the inner wall of the tank 100 to wash away the tar and soften it. A pump is installed on the outer wall of the return pipe 103 to extract the water produced by biomaterial decomposition. During the process of cleaning block 2 301 sliding back and forth on the inner wall of tank 100 to clean the tar, the water produced by the decomposition of biological materials is extracted through the return pipe 103 and guided to the top of the inner wall of tank 100 for return through the guide hole 104. The water flows along the inner wall of tank 100 to soften the tar and works with cleaning block 2 301 to clean the tar. After the oil continues to flow away from the stirring mechanism 200 from the protrusion on the inner wall of tank 100, it enters the settling stage. The drive rod 102 rotates on the outer wall of the fixed shaft 105, causing the vibrating block 106 to slide along the inner wall of the drive rod 102 supported by the spring 109. The vibrating block 106 enters the groove 110 and the drive rod 102 rotates to drive the vibrating block 106 to slide back and forth on the inner wall of the drive rod 102, causing the vibrating block 106 to vibrate in the oil, causing the oil to separate and separate from the water and biological materials, and the oil is collected.

[0025] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for continuous hydrothermal liquefaction of high-moisture-content biomass to produce oil, characterized in that, Includes the following steps: S1. The biomass material is put into the tank (100) and heated and pressurized. The biomass material is stirred by the stirring mechanism (200) to accelerate the decomposition rate of the biomass material. S2. The stirring mechanism (200) stirs the biological material in the tank (100), scrapes off the tar attached to the inner wall of the tank (100), extracts the gas above the oil surface inside the tank (100), and injects it into the biological material at the bottom of the tank (100) to generate bubbles, mimicking the boiling of water to assist in stirring the biological material. S3. During the decomposition process, the biological material guides the generated water and flows back from the top of the inner wall of the tank (100) to flow downward along the inner wall of the tank (100). After softening the tar attached to the inner wall of the tank (100), it is scraped off by the cleaning mechanism (300) and the tar is squeezed into small pieces. S4. The oil produced after the decomposition of biomass materials is separated into layers with water and biomass materials by vibration. After the oil is extracted, the oil refining process is completed.

2. The method for continuous hydrothermal liquefaction of high-moisture-content biomass to produce oil according to claim 1, characterized in that: The stirring mechanism (200) includes a scraper (201), the outer wall of which contacts the inner wall of the tank (100) and is used to stir the biological material inside the tank (100) while scraping off the tar attached to the inner wall. A support rod (202) is fixedly connected to the inner wall of the scraper (201) and is used to support the scraper (201). A sliding sleeve (203) is slidably connected to the outer wall of the support rod (202), and a counterweight (205) is fixedly connected to the outer wall of the sliding sleeve (203). The counterweight (205) drives the sliding sleeve (203) to slide on the outer wall of the support rod (202) by gravity.

3. The method for continuous hydrothermal liquefaction of high-moisture-content biomass to produce oil according to claim 2, characterized in that: The outer wall of the support rod (202) is provided with a guide groove (204), which is spirally formed on the outer wall of the support rod (202). A suction rod (213) is slidably connected to the inner wall of the support rod (202). The outer wall of the suction rod (213) is fixedly connected to the inner wall of the sliding sleeve (203) through the guide groove (204) via a slider. The outer wall of the support rod (202) is provided with a flow guide hole (214), which is used to guide the gas inside the tank (100) to the inside of the support rod (202). The counterweight (205) is fixedly connected to a scraper (206) at the end away from the sliding sleeve (203). The scraper (206) is used to clean the tar adhering to the outer wall of the support rod (202) when the sliding sleeve (203) slides on the outer wall of the support rod (202).

4. The method for continuous hydrothermal liquefaction of high-moisture-content biomass to produce oil according to claim 3, characterized in that: The inner wall of the tank (100) is rotatably connected to a drive rod (102) via a bearing. The drive rod (102) is driven to rotate by a motor installed on the outer wall of the tank (100). The end of the support rod (202) near the drive rod (102) is fixedly connected to the outer wall of the drive rod (102). A fixed shaft (105) is fixedly connected to the inner wall of the tank (100). The fixed shaft (105) is installed inside the drive rod (102) and is used to support the drive rod (102).

5. The method for continuous hydrothermal liquefaction of high-moisture-content biomass to produce oil according to claim 4, characterized in that: The outer wall of the drive rod (102) is provided with a sliding groove (107), the outer wall of the fixed shaft (105) is provided with a circulation groove (112), the outer wall of the scraper (201) is provided with a sliding groove (207), the wall of the sliding groove (207) is slidably connected to an arc plate (208) by a slider, the outer wall of the arc plate (208) is fixedly connected to a cleaning block (209), the outer wall of the cleaning block (209) is used to scrape off the tar attached to the outer wall of the scraper (201), the arc plate (208) slides along the groove of the sliding groove (207) to stir the biological material, the inner wall of the arc plate (208) is fixedly connected to a stirring blade (210), the stirring blade (210) is used to stir the biological material.

6. The method for continuous hydrothermal liquefaction of high-moisture-content biomass to produce oil according to claim 5, characterized in that: The inner wall of the arc plate (208) is fixedly connected to a second support rod (211). The end of the second support rod (211) away from the arc plate (208) is fixedly connected to a guide block (212). The inner wall of the guide block (212) slides along the outer wall of the drive rod (102). The inner wall of the guide block (212) is slidably connected to the wall of the second circulation groove (112) through a slider through the sliding groove (107). The second circulation groove (112) is used to guide the guide block (212) and drive the guide block (212) to slide back and forth along the wall of the sliding groove (107).

7. The method for continuous hydrothermal liquefaction of high-moisture-content biomass to produce oil according to claim 6, characterized in that: A diversion plate (101) is fixedly connected to the inner wall of the tank (100). A circulation groove (111) is formed on the outer wall of the fixed shaft (105). A sliding groove (108) is formed on the outer wall of the fixed shaft (105). The cleaning mechanism (300) includes a sliding sleeve (304). The inner wall of the sliding sleeve (304) is slidably connected to the wall of the circulation groove (111) through a slider passing through the sliding groove (108). The circulation groove (111) guides the sliding sleeve (304) to slide back and forth along the wall of the sliding groove (108). A support rod (303) is fixedly connected to the outer wall of the sliding sleeve (304). The support rod (303) is located away from the sliding sleeve (304). A cleaning block 2 (301) is fixedly connected to one end. The outer wall of the cleaning block 2 (301) contacts the inner wall of the tank (100) and is used to scrape off the tar adhering to the inner wall of the tank (100). A baffle (302) is slidably connected to the inner wall of the cleaning block 2 (301). The baffle (302) is used to block the tar scraped off by the cleaning block 2 (301) on the inner wall of the tank (100). An elastic push rod (305) is fixedly connected to the outer wall of the cleaning block 2 (301). The output end of the elastic push rod (305) is fixedly connected to the outer wall of the baffle (302). The elastic push rod (305) is used to support the baffle (302) so that the baffle (302) protrudes from the outer wall of the cleaning block 2 (301).

8. The method for continuous hydrothermal liquefaction of high-moisture-content biomass to produce oil according to claim 7, characterized in that: A vibrating block (106) is slidably connected to the inner wall of the drive rod (102). A spring (109) is fixedly connected to the inner wall of the vibrating block (106). The other end of the spring (109) is fixedly connected to the inner wall of the drive rod (102). A groove (110) is provided on the outer wall of the fixed shaft (105). The vibrating block (106) is supported by the spring (109) and enters the groove (110). The rotation of the drive rod (102) causes the vibrating block (106) to squeeze the spring (109) and slide on the inner wall of the drive rod (102), thus agitating the oil. The oil is separated and separated into layers. The middle section of the inner wall of the tank (100) is raised, and the inclined surface of the inner wall is used to intercept solid biomaterials. A guide hole (104) is opened on the inner wall of the tank (100). A return pipe (103) is fixedly connected inside the tank (100). The return pipe (103) is used to guide the water produced by biomass decomposition and return it from the top of the inner wall of the tank (100) through the guide hole (104). The water flows down the inner wall of the tank (100) to wash the tar and soften it.

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