A biomass continuous hydrothermal liquefaction oil production cleaning system

Abstract

This invention relates to the field of biomass energy conversion technology, and in particular to a continuous hydrothermal liquefaction and oil production cleaning system for biomass. It includes a reaction module connected to a feeding module. The reaction module comprises a multi-section tubular reactor and an ultrasonic vibrator. The inner wall of each tubular reactor is coated with a silicon carbide-based anti-coking coating to prevent coking of the biomass slurry during the reaction process. A separation module is connected to the reaction module and includes multiple separators for gas-liquid separation, solid-liquid separation, and oil-water separation of the reacted biomass material to obtain biomass oil. A cleaning module is connected to the reaction module for high-pressure cleaning of the reaction and separation modules to improve the oil phase recovery rate. This invention not only reduces equipment maintenance costs but also reduces biomass oil loss during the reaction and separation processes, increasing the overall yield: compared to traditional processes, the total biomass oil yield is increased by 8% to 10%.

Description

Technical Field

[0001] This invention relates to the field of biomass energy conversion technology, and in particular to a continuous hydrothermal liquefaction oil production and cleaning system for biomass. Background Technology

[0002] Traditional biomass hydrothermal liquefaction tubular reactors have the following main drawbacks:

[0003] 1. System is prone to clogging and coking: Biomass particles or reaction intermediates are prone to deposit in the feed pipe, reactor inner wall and separation equipment, resulting in reduced heat transfer efficiency, shortened equipment life, and even safety hazards.

[0004] 2. Oil phase loss problem: During the reaction process, biomass oil adheres to pipelines and equipment, and residual oil droplets are not fully recovered, resulting in a decrease in overall yield;

[0005] 3. The existing cleaning process requires machine shutdown, and intermittent cleaning will affect the stability of continuous production. Summary of the Invention

[0006] The present invention aims to at least improve one of the technical problems existing in the prior art. To this end, the present invention proposes a biomass continuous hydrothermal liquefaction oil production and cleaning system.

[0007] The technical solution of the present invention is as follows:

[0008] A biomass continuous hydrothermal liquefaction oil production cleaning system, comprising:

[0009] The feeding module is used to transport biomass materials;

[0010] A reaction module is connected to the feeding module. The reaction module includes a multi-section tubular reactor and an ultrasonic vibrator. The inner wall of each tubular reactor is coated with a silicon carbide-based anti-coking coating. The ultrasonic vibrator is installed on the multi-section tubular reactor to prevent the biomass slurry from coking during the reaction process.

[0011] A separation module, connected to the reaction module, includes multiple separators for gas-liquid separation, solid-liquid separation, and oil-water separation of the reaction products to obtain biomass oil.

[0012] The cleaning module, connected to the reaction module and the separation module, is used for high-pressure cleaning of the reaction module and the separation module to improve the oil phase recovery rate.

[0013] In one possible technical solution, the separation module further comprises modules arranged from high to low.

[0014] A gas-liquid separator is used to separate reaction products into gas and liquid components.

[0015] A solid-liquid separator, connected to the gas-liquid separator, is used to perform solid-liquid separation on the reaction products after gas-liquid separation.

[0016] An oil-water separator, connected to the solid-liquid separator, is used to separate the oil and water in the reaction products after solid-liquid separation to obtain biomass oil.

[0017] In one possible technical solution, each separator is further equipped with multiple self-cleaning spray heads, employing multi-stage cleaning and multi-stage unblocking methods to clean the dead corners at the bottom of the container, thus meeting the actual requirements of continuous production and centralized maintenance.

[0018] In one possible technical solution, the cleaning module further includes:

[0019] The flushing reactor, connected to the reaction module, is used for high-pressure cleaning of the reaction module and the separation module.

[0020] The waste liquid recycling and treatment module is connected to the separation module and is used to recycle the cleaning waste liquid to improve the oil phase recovery rate.

[0021] In one possible technical solution, the separation module further includes:

[0022] Multiple buffer tanks, each installed at the inlet of each separator, are used to improve the stability, safety and separation efficiency of each separator in the separation module.

[0023] In one possible technical solution, each buffer tank is further provided with multiple self-cleaning spray heads at the top inside to prevent oil-solid mixtures from adhering. The separation equipment at each level is positioned from high to low to ensure thorough cleaning without any blind spots.

[0024] In one possible technical solution, the buffer tank further comprises:

[0025] The first buffer tank is installed between the reaction module and the gas-liquid separator. It is used for gas-liquid separation pretreatment to prevent the reaction efficiency from decreasing due to sudden changes in system pressure, and is also used for storing and subsequently separating gaseous products.

[0026] The second buffer tank is installed between the gas-liquid separator and the solid-liquid separator for pressurized filtration and solid-liquid separation.

[0027] The third buffer tank is installed between the solid-liquid separator and the oil-water separator to store and subsequently separate oil phase products.

[0028] In one possible technical solution, the reaction module further includes:

[0029] The preheating pipe is connected at one end to the feeding module and at the other end to the multi-section tubular reactor.

[0030] The cooler is connected at one end to the multi-section tubular reactor and at the other end to the separation module. The heat output end of the cooler is connected to the preheating pipe, which uses the waste heat in the system to preheat the slurry and reduce the system energy consumption.

[0031] In one possible technical solution, the feeding module further includes:

[0032] A screw conveyor is connected to the reaction module. The screw conveyor is a double hydraulic cylinder pressurized screw conveyor used to convey biomass materials with a reaction pressure of less than 15 MPa.

[0033] A high-pressure pump, connected to the reaction module, is used to transport biomass materials with a particle size of 50 mesh or larger.

[0034] In one possible technical solution, the multi-segment tubular reactor is further equipped with multiple temperature sensors.

[0035] The cleaning system also includes a control display screen connected to the temperature sensor, used to display the reaction temperature in real time, facilitating the control of the reaction process.

[0036] The biomass continuous hydrothermal liquefaction oil production cleaning system according to the present invention has the following beneficial effects:

[0037] 1. It can maintain the efficient, clean, and safe operation of the feeding module, reaction module, and separation module, reducing equipment maintenance costs;

[0038] 2. The reaction module, separation module, and cleaning module in this invention can reduce the loss of biomass oil during the reaction and separation process and improve the overall yield: compared with the traditional process, the total yield of biomass oil is increased by 8-10%;

[0039] 3. The closed-loop cleaning method using the cleaning module can improve environmental protection and economy. After cleaning and recovering biomass oil, the wastewater can be recycled, and the separated solvent can be used for closed-loop cleaning.

[0040] 4. The present invention is equipped with multiple self-cleaning spray heads in each buffer tank and separator, and adopts multi-stage cleaning and multi-stage unblocking methods to meet the actual requirements of continuous production and centralized maintenance; wherein the preliminary cleaning step can be controlled by computer program to realize the automatic switching between normal reaction and cleaning.

[0041] A continuous hydrothermal liquefaction oil-making and cleaning method for biomass, wherein the above-mentioned system is used to clean the biomass for oil production, comprising the following steps:

[0042] Pretreatment and feeding: The biomass material is crushed and mixed with water to form a slurry, which is then conveyed to the preheating pipeline for preheating through the feeding module;

[0043] Continuous reaction: The slurry is fed into a multi-stage tubular reactor and heated in stages until the target conditions are met, and then the reaction is stopped to obtain the reaction product. The ultrasonic vibrator is turned on during each stage of heating in the multi-stage tubular reactor.

[0044] Separation and recovery: The reaction products are subjected to multi-stage separation to remove solid residues and aqueous phase, and the oil phase of the reaction products is recovered.

[0045] After separation and recovery, the rinsing reactor and waste liquid recovery and treatment module are started to perform closed-loop cleaning of the reaction module and separation module. The water and solvent in the cleaning process are recycled and reused, and the oil phase in the cleaning process is recovered.

[0046] The biomass continuous hydrothermal liquefaction oil production cleaning method according to the present invention has the following beneficial effects:

[0047] 1. A continuous hydrothermal liquefaction oil production cleaning system based on biomass is used for cleaning. High-pressure water, solvents, or high-pressure air can be used to periodically remove residues from the pipes to prevent blockages. A multi-stage temperature-controlled tubular reactor is designed with a corrosion-resistant and anti-coking coating on the inner wall and an ultrasonic vibrator to remove residues simultaneously during the reaction. Centrifugal separation and multi-stage membrane separation modules are integrated. The separator is equipped with a self-cleaning spray head to prevent oil-solid mixtures from adhering. The separation equipment at each stage is positioned from high to low to ensure thorough cleaning without dead angles.

[0048] 2. High-efficiency oil phase recovery: Through a multi-stage cleaning process, the loss of oil phase in the pipeline is avoided.

[0049] 3. If the pipeline is blocked, the blockage problem can be effectively solved through preliminary cleaning and deep cleaning; the preliminary cleaning step can be controlled by a computer program to achieve normalized reaction and automatic switching of cleaning.

[0050] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0051] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments 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.

[0052] Figure 1This is a schematic diagram of the structure of a biomass continuous hydrothermal liquefaction oil production and cleaning system according to an embodiment of the present invention;

[0053] Figure 2 This is a schematic diagram of the operation of a biomass continuous hydrothermal liquefaction oil production and cleaning system according to an embodiment of the present invention. Detailed Implementation

[0054] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0055] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0057] The terms "first," "second," "third," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects and not to describe a particular order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, it may include a series of steps or units, or optionally, steps or units not listed, or other steps or units inherent to these processes, methods, products, or devices.

[0058] The accompanying drawings show only the portions relevant to this application, not all of them. Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although the flowcharts describe operations (or steps) as sequential processes, many of these operations may be performed in parallel, concurrently, or simultaneously. Furthermore, the order of the operations may be rearranged. The process may be terminated when its operation is completed, but may also have additional steps not included in the drawings. The process may correspond to a method, function, procedure, subroutine, subprogram, etc.

[0059] The terms “component,” “module,” “system,” “unit,” etc., used in this specification are used to refer to computer-related entities, hardware, firmware, combinations of hardware and software, software, or software in execution. For example, a unit can be, but is not limited to, a process running on a processor, a processor, an object, an executable file, a thread of execution, a program, and / or distributed between two or more computers. Furthermore, these units can be executed from various computer-readable media on which various data structures are stored. Units can communicate via local and / or remote processes based on signals having one or more data packets, such as data from a second unit interacting with another unit between a local system, a distributed system, and / or a network. For example, the Internet interacting with other systems via signals.

[0060] Example 1

[0061] like Figure 1 and Figure 2 As shown, this embodiment provides a biomass continuous hydrothermal liquefaction oil production cleaning system, which includes:

[0062] The feeding module is used to transport biomass materials;

[0063] A reaction module is connected to the feeding module. The reaction module includes a multi-section tubular reactor and an ultrasonic vibrator. The inner wall of each tubular reactor is coated with a silicon carbide-based anti-coking coating. The ultrasonic vibrator is installed on the multi-section tubular reactor to prevent the biomass slurry from coking during the reaction process.

[0064] A separation module, connected to the reaction module, includes multiple separators for gas-liquid separation, solid-liquid separation, and oil-water separation of the reaction products to obtain biomass oil; in this embodiment, the separation module is arranged from high to low.

[0065] A gas-liquid separator is used to separate reaction products into gas and liquid components.

[0066] A solid-liquid separator, connected to the gas-liquid separator, is used to perform solid-liquid separation on the reaction products after gas-liquid separation.

[0067] An oil-water separator, connected to the solid-liquid separator, is used to separate the oil and water in the reaction products after solid-liquid separation to obtain biomass oil.

[0068] The cleaning module, connected to the reaction module and the separation module, is used for high-pressure cleaning of the reaction module and the separation module to improve the oil phase recovery rate.

[0069] It should be noted that each separator is equipped with multiple self-cleaning spray heads, employing multi-stage cleaning and multi-stage unblocking methods to clean the dead corners at the bottom of the container, meeting the actual requirements of continuous production and centralized maintenance.

[0070] It should be noted that the cleaning module includes:

[0071] The flushing reactor, connected to the reaction module, is used for high-pressure cleaning of the reaction module and the separation module.

[0072] The waste liquid recycling and treatment module is connected to the separation module and is used to recycle the cleaning waste liquid to improve the oil phase recovery rate.

[0073] It should be noted that the separation module also includes:

[0074] Multiple buffer tanks, each installed at the inlet of each separator, are used to improve the stability, safety and separation efficiency of each separator in the separation module.

[0075] It should be noted that each buffer tank is equipped with multiple self-cleaning spray heads at the top inside to prevent oil-solid mixtures from adhering. The separation equipment at each stage is positioned from high to low to ensure thorough cleaning without any blind spots.

[0076] It should be noted that the buffer tank includes:

[0077] The first buffer tank is installed between the reaction module and the gas-liquid separator. It is used for gas-liquid separation pretreatment to prevent the reaction efficiency from decreasing due to sudden changes in system pressure, and is also used for storing and subsequently separating gaseous products.

[0078] The second buffer tank is installed between the gas-liquid separator and the solid-liquid separator for pressurized filtration and solid-liquid separation.

[0079] The third buffer tank is installed between the solid-liquid separator and the oil-water separator to store and subsequently separate oil phase products.

[0080] It should be noted that the reaction module also includes:

[0081] The preheating pipe is connected at one end to the feeding module and at the other end to the multi-section tubular reactor.

[0082] The cooler is connected at one end to the multi-section tubular reactor and at the other end to the separation module. The heat output end of the cooler is connected to the preheating pipe, which uses the waste heat in the system to preheat the slurry and reduce the system energy consumption.

[0083] It should be noted that the feeding module includes:

[0084] A screw conveyor is connected to the reaction module. The screw conveyor is a double hydraulic cylinder pressurized screw conveyor used to convey biomass materials with a reaction pressure of less than 15 MPa.

[0085] A high-pressure pump, connected to the reaction module, is used to transport biomass materials with a particle size of 50 mesh or larger. In this embodiment, the high-pressure pump can be a high-pressure plunger pump.

[0086] It should be noted that, in this embodiment, an aqueous phase storage tank, a solvent storage tank, and a biomass oil storage tank are also included, for storing the aqueous phase, solvent, and biomass oil respectively, wherein the water and solvent can be recycled for cleaning.

[0087] The biomass continuous hydrothermal liquefaction oil production cleaning system according to the present invention has the following beneficial effects:

[0088] 1. It can maintain the efficient, clean, and safe operation of the feeding module, reaction module, and separation module, reducing equipment maintenance costs;

[0089] 2. The reaction module, separation module, and cleaning module in this invention can reduce the loss of biomass oil during the reaction and separation process and improve the overall yield: compared with the traditional process, the total yield of biomass oil is increased by 8-10%;

[0090] 3. The closed-loop cleaning method using the cleaning module can improve environmental protection and economy. After cleaning and recovering biomass oil, the wastewater can be recycled, and the separated solvent can be used for closed-loop cleaning.

[0091] 4. The present invention is equipped with multiple self-cleaning spray heads in each buffer tank and separator, and adopts multi-stage cleaning and multi-stage unblocking methods to meet the actual requirements of continuous production and centralized maintenance; wherein the preliminary cleaning step can be controlled by computer program to realize the automatic switching between normal reaction and cleaning.

[0092] Example 2

[0093] This embodiment further improves upon Embodiment 1, providing a continuous hydrothermal liquefaction oil production and cleaning system for biomass. The multi-segment tubular reactor is equipped with multiple temperature and pressure sensors.

[0094] The cleaning system also includes a control display screen connected to the temperature and pressure sensors to display the reaction temperature and pressure in real time, facilitating the regulation of the reaction and cleaning process and diagnosing blockages within the system through real-time data.

[0095] This invention solves the problems of equipment blockage, oil phase loss, and cleaning shutdown in the continuous hydrothermal liquefaction process of biomass by designing and optimizing closed-loop online, preliminary and deep cleaning and unblocking methods, which significantly improves the biomass oil yield and system operation stability.

[0096] Example 3

[0097] This embodiment provides a method for cleaning biomass through continuous hydrothermal liquefaction for oil production, based on the above embodiments. The method involves cleaning the biomass using the aforementioned system, including the following steps:

[0098] Pretreatment and feeding: The biomass material is crushed and mixed with water to form a slurry, which is then conveyed to the preheating pipeline for preheating through the feeding module;

[0099] Continuous reaction: The slurry is transported to a multi-stage tubular reactor and heated in stages until the target conditions are met, and then the reaction product is obtained. The ultrasonic vibrator is turned on during each stage of heating in the multi-stage tubular reactor. In this embodiment, the target conditions include the temperature of the multi-stage tubular reactor being controlled at 200℃~400℃, the pressure being controlled at 5MPa~30MPa, and the residence time being 15 minutes~60 minutes.

[0100] Separation and recovery: The reaction products are subjected to multi-stage separation to remove solid residues and aqueous phase, and the oil phase of the reaction products is recovered.

[0101] After separation and recovery, the rinsing reactor and waste liquid recovery and treatment module are started to perform closed-loop cleaning of the reaction module and separation module. The water and solvent in the cleaning process are recycled and reused, and the oil phase in the cleaning process is recovered.

[0102] This embodiment provides the following specific examples to illustrate the technical effects of the present invention:

[0103] Specific Cases

[0104] The cleaning system described in Example 1 was used to continuously clean kitchen waste, pig manure, and lignin cellulose for oil production. The cleaning process is as follows:

[0105] 1. Pretreatment and feeding:

[0106] After pretreatment, the target biomass material is crushed to 0.1mm-3mm and mixed with water to form a 1-30wt% slurry. The slurry is then fed into a preheating pipeline via a screw conveyor and a high-pressure pump. The temperature of the preheating pipeline is 50℃-250℃.

[0107] 2. Continuous reaction:

[0108] The slurry is heated in stages to 200℃~400℃ in a multi-stage tubular reactor, and the internal pressure of the reactor is controlled at 5MPa~30MPa, with a residence time of 10 minutes~100 minutes. The ultrasonic vibration frequency of each stage of the multi-stage tubular reactor is set at 20kHz~50kHz to prevent coking of the biomass slurry.

[0109] 3. Separation and recycling:

[0110] The reaction products are separated in multiple stages to remove solid residues and aqueous phase. Finally, the oil phase of biomass oil is obtained by washing. According to actual statistical calculations, the recovery rate of the oil phase can reach 8% to 10%, as shown in Table 1.

[0111]

[0112] The oil phase recovery rate is calculated as: (mass of recovered biomass oil / dry weight of biomass feedstock).

[0113] 4. Cleaning and recycling:

[0114] At fixed times each day, the flushing reactor and waste liquid recovery and treatment module are activated to perform closed-loop cleaning of the reaction module and separation module. Water and solvents from the cleaning process are recycled, and the oil phase from the cleaning process is recovered. Every 1-3 months during production, a deep cleaning is performed again to remove carbon deposits and tar from the pipelines.

[0115] The biomass continuous hydrothermal liquefaction oil production cleaning method according to the present invention has the following beneficial effects:

[0116] 1. A continuous hydrothermal liquefaction oil production cleaning system based on biomass is used for cleaning. High-pressure water, solvents, or high-pressure air can be used to periodically remove residues from the pipes to prevent blockages. A multi-stage temperature-controlled tubular reactor is designed with a corrosion-resistant and anti-coking coating on the inner wall and an ultrasonic vibrator to remove residues simultaneously during the reaction. Centrifugal separation and multi-stage membrane separation modules are integrated. The separator is equipped with a self-cleaning spray head to prevent oil-solid mixtures from adhering. The separation equipment at each stage is positioned from high to low to ensure thorough cleaning without dead angles.

[0117] 2. High-efficiency oil phase recovery: Through a multi-stage cleaning process, the loss of oil phase in the pipeline is avoided.

[0118] 3. If the pipeline is blocked, the blockage problem can be effectively solved through preliminary cleaning and deep cleaning; the preliminary cleaning step can be controlled by a computer program to achieve normalized reaction and automatic switching of cleaning.

[0119] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0120] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0121] Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The reference to "embodiment" herein means that a specific feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily indicate the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0122] Although embodiments of the invention have been shown and described, those skilled in the art will understand 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 claims and their equivalents.

Claims

1. A biomass continuous hydrothermal liquefaction oil production and cleaning system, characterized in that, include: The feeding module is used to transport biomass materials; A reaction module is connected to the feeding module. The reaction module includes a multi-section tubular reactor and an ultrasonic vibrator. The inner wall of each tubular reactor is coated with a silicon carbide-based anti-scorching coating. The ultrasonic vibrator is installed on the multi-section tubular reactor. A separation module, connected to the reaction module, includes the following three types of separators arranged from high to low: A gas-liquid separator is used to separate reaction products into gas and liquid components. A solid-liquid separator, connected to the gas-liquid separator, is used to perform solid-liquid separation on the reaction products after gas-liquid separation. An oil-water separator, connected to the solid-liquid separator, is used to separate the oil and water in the reaction products after solid-liquid separation to obtain biomass oil. Each separator is equipped with multiple self-cleaning spray heads. The separation module further includes: Multiple buffer tanks, each installed at the inlet of each separator, are used to improve the stability, safety, and separation efficiency of each separator in the separation module. Each buffer tank has multiple self-cleaning spray heads at its inner top. The multiple buffer tanks include: The first buffer tank is installed between the reaction module and the gas-liquid separator; The second buffer tank is installed between the gas-liquid separator and the solid-liquid separator; The third buffer tank is installed between the solid-liquid separator and the oil-water separator; A cleaning module, connected to the reaction module and the separation module, is used for high-pressure cleaning of the reaction module and the separation module to improve the oil phase recovery rate. The cleaning module includes: The flushing reactor, connected to the reaction module, is used for high-pressure cleaning of the reaction module and the separation module. The waste liquid recycling and treatment module is connected to the separation module and is used to recycle the cleaning waste liquid to improve the oil phase recovery rate.

2. The biomass continuous hydrothermal liquefaction oil production and cleaning system according to claim 1, characterized in that, The reaction module also includes: The preheating pipe is connected at one end to the feeding module and at the other end to the multi-section tubular reactor. The cooler is connected at one end to the multi-section tubular reactor and at the other end to the separation module, wherein the heat output end of the cooler is connected to the preheating pipe.

3. The biomass continuous hydrothermal liquefaction oil production and cleaning system according to claim 1, characterized in that, The feeding module includes: A screw conveyor is connected to the reaction module. The screw conveyor is a double hydraulic cylinder pressurized screw conveyor used to convey biomass materials with a reaction pressure of less than 15 MPa. A high-pressure pump, connected to the reaction module, is used to transport biomass materials with a particle size of 50 mesh or larger.

4. A method for cleaning biomass continuous hydrothermal liquefaction oil production, characterized in that, The process of cleaning the biomass for oil extraction using the system described in any one of claims 1 to 3 includes the following steps: Pretreatment and feeding: After pretreatment, the biomass material is mixed with water to form a slurry, which is then conveyed to the preheating pipeline for preheating via the feeding module; Continuous reaction: The slurry is fed into a multi-stage tubular reactor and heated in stages until the target conditions are met, and then the reaction is stopped to obtain the reaction product. The ultrasonic vibrator is turned on during each stage of heating in the multi-stage tubular reactor. Separation and recovery: The reaction products are subjected to multi-stage separation to remove solid residues and aqueous phase, and the oil phase of the reaction products is recovered. Cleaning and recovery: After separation and recovery, the flushing reactor and waste liquid recovery and treatment module are started to perform closed-loop cleaning of the reaction module and separation module, and the water and solvent in the cleaning process are recycled and reused, and the oil phase in the cleaning process is recovered.

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