Continuous segmented hydrothermal liquefaction system and control method

Abstract

This invention provides a continuous segmented hydrothermal liquefaction system and control method. The material storage and transportation module, alternating stirring module, hydrothermal liquefaction and water circulation module, and hydrothermal liquefaction product separation module are sequentially connected. A control module is connected to each of these modules. The material storage and transportation module stores materials and liquids separately, mixes them, and then heats them into a mixture. This invention achieves the migration of various impurities from the solid phase product to the liquid phase through a pretreatment device and a post-pretreatment material separation device, thereby reducing the absolute content of impurities in the hydrothermal liquefaction material. This achieves the goal of improving the quality of biomass pretreatment as required by low-temperature hydrothermal pretreatment, enabling two-stage hydrothermal liquefaction of various biomass raw materials and expanding the system's applicability.

Description

Technical Field

[0001] This invention belongs to the field of biomass resource utilization, and particularly relates to a continuous segmented hydrothermal liquefaction system and its control method. Background Technology

[0002] Biomass refers to substances derived from animals, plants, or microorganisms that can be used to produce energy. It can be categorized into energy crops, agricultural residues and waste, forestry residues and waste, and industrial and municipal waste. Liquefaction is currently a major direction for the high-value conversion of biomass, with applications including fuels, chemical products, and pharmaceutical raw materials. Current biomass liquefaction technologies mainly include biochemical methods for producing bioethanol and thermochemical conversion methods for producing bio-oil products containing various components. Among these, thermochemical conversion allows for the adjustment of operating conditions to achieve targeted production of specific components, and it can produce a wider range of components than biochemical methods. Furthermore, the technical routes for producing sugars, hydrocarbons, esters, and phenols using thermochemical conversion have been identified, giving it certain advantages.

[0003] Pyrolysis and hydrothermal liquefaction are both widely used as major processes for the thermochemical conversion of biomass. However, actual biomass, especially kitchen waste, municipal sludge, and some aquatic biomass, often has a high moisture content. Pyrolysis processes have strict requirements on the moisture content of the raw materials. Therefore, in actual biomass pyrolysis-liquefaction processes, a dedicated raw material drying module is often required. The additional time and economic costs incurred by medium- and large-scale biomass pyrolysis plants are not negligible. Hydrothermal liquefaction, on the other hand, allows wet biomass to be used directly as raw material and has no strict requirements on the moisture content of the material. This gives hydrothermal liquefaction a certain advantage in medium- and large-scale biomass liquefaction production, and research on the design of biomass hydrothermal liquefaction reactors has been extensively carried out.

[0004] Hydrothermal liquefaction typically refers to the process of converting biomass into liquid organic molecules within a short period of time under certain temperature and pressure. Biomass crude oil obtained through hydrothermal liquefaction has advantages such as high yield and wide application range. However, the resulting crude oil often has drawbacks such as high viscosity and complex composition. Some components contain high levels of heteroatoms such as oxygen and nitrogen, and these heteroatoms exist in complex forms, which limits the application of biomass crude oil obtained through hydrothermal liquefaction. Feed pretreatment and catalytic upgrading during hydrothermal liquefaction are the main approaches to solving these problems. Feed pretreatment achieved through pathways such as two-stage hydrothermal liquefaction eliminates the need for time and economic costs in developing catalysts with extremely high catalytic deoxygenation and denitrification activity, making it more valuable for medium- and large-scale biomass hydrothermal liquefaction production. Two-stage hydrothermal liquefaction refers to the hydrothermal liquefaction reaction of materials at different reaction temperatures. When the purpose is material pretreatment, product separation after the reaction at the first temperature stage is essential. Two-stage hydrothermal liquefaction for material pretreatment utilizes the differences in decomposition temperature and pressure ranges among components in biomass feedstock. Through the decomposition of components or functional groups with high heteroatom content, heteroatoms migrate from the solid phase to the liquid and gas phases. After pretreatment, the solid and liquid products are separated, thereby reducing the absolute heteroatom content in the biomass and achieving biomass pretreatment and quality improvement. Pretreatment methods based on these principles and general reaction systems that can be used to implement this pretreatment pathway have been disclosed. However, currently, no reaction system can achieve a continuous "pretreatment-hydrothermal liquefaction" reaction process.

[0005] Medium- and large-scale biomass hydrothermal liquefaction often places demands on the design of hydrothermal liquefaction reactors. Currently, based on the feedstock flow, hydrothermal liquefaction reactors can be divided into batch reactors and continuous reactors. In a typical process flow, hydrothermal liquefaction generally consists of three processes: material preparation, hydrothermal liquefaction, and product separation. For batch reactors, only the hydrothermal liquefaction reaction process is completed. Materials need to be prepared in other units before being filled into the reactor, and the products are collected and separated in other units at the end of hydrothermal liquefaction. This type of reactor can achieve stable and uniform reaction conditions, but currently produced batch reactors are small in size and expensive, making it difficult to achieve large-scale and fully automated "raw material-product" production requirements in terms of equipment size and reaction flow. In contrast, continuous reactors can achieve uninterrupted production of the entire process of material preparation, hydrothermal liquefaction, and product separation in a single unit, meeting the needs of fully automated "raw material-product" production. Therefore, they have become the mainstream trend in the design of hydrothermal liquefaction reactors. However, existing continuous reactors only operate and obtain products under a single hydrothermal liquefaction condition and do not have the function of multi-temperature hydrothermal liquefaction reaction. Moreover, the operating rate of existing continuous hydrothermal liquefaction equipment is low, and the single straight-through pipeline design means that if one node is blocked, the entire system will be paralyzed, resulting in a high system failure rate.

[0006] There are no reports on continuous hydrothermal liquefaction devices with two-stage hydrothermal liquefaction in the existing technology. In particular, no specific devices with industrial application value have been proposed for continuously completing the material filtration and separation after the first stage of hydrothermal liquefaction, the material preparation for the second stage of hydrothermal liquefaction, and the material transportation for the second stage of hydrothermal liquefaction. In other words, continuous segmented hydrothermal liquefaction systems still need to be designed and developed. Summary of the Invention

[0007] The present invention aims to at least partially solve one of the aforementioned technical problems. To this end, the present invention proposes a continuous segmented hydrothermal liquefaction system and control method, enabling the continuous operation of segmented hydrothermal liquefaction devices for biomass.

[0008] Note that the description of these objectives does not preclude the existence of other objectives. One aspect of the invention does not require achieving all of the above objectives. Objectives other than those described above can be extracted from the description, drawings, and claims.

[0009] The technical solution of this invention is:

[0010] A continuous segmented hydrothermal liquefaction system includes a material storage and transportation module, an alternating stirring module, a hydrothermal liquefaction and water circulation module, a hydrothermal liquefaction product separation module, and a control module;

[0011] The material storage and transportation module, alternating stirring module, hydrothermal liquefaction and water circulation module, and hydrothermal liquefaction product separation module are connected in sequence. The control module is connected to the material storage and transportation module, alternating stirring module, hydrothermal liquefaction and water circulation module, and hydrothermal liquefaction product separation module respectively. The material storage and transportation module is used to store materials and liquids separately, mix them, and heat them into a mixture. The mixture enters the alternating stirring module in batches. The alternating stirring module is used to pre-treat the mixture. The pre-treated mixture enters the hydrothermal liquefaction and water circulation module in sequence. The hydrothermal liquefaction and water circulation module is used to perform a hydrothermal liquefaction reaction on the pre-treated mixture to obtain hydrothermal liquefaction products. The hydrothermal liquefaction products enter the hydrothermal liquefaction product separation module. The hydrothermal liquefaction product separation module is used to separate the hydrothermal liquefaction products to obtain solid phase products and liquid phase products, which are then stored separately.

[0012] In the above scheme, the alternating stirring module includes several high-pressure filter stirrers and a waste liquid storage tank. Each high-pressure filter stirrer is connected to the waste liquid storage tank. Each high-pressure filter stirrer is connected to the material storage and transportation module and the hydrothermal liquefaction and water circulation module. Each high-pressure filter stirrer is equipped with a shut-off valve at the connection between it and the material storage and transportation module. The control module controls the mixed materials to enter each high-pressure filter stirrer in batches for processing and then enter the hydrothermal liquefaction and water circulation module in sequence. The waste liquid filtered by the high-pressure filter stirrer enters the waste liquid storage tank.

[0013] In the above scheme, the high-pressure filter agitator includes an agitator motor, blades, a connecting shaft, and an agitator housing;

[0014] The blades and connecting shaft are located inside the agitator housing. The connecting shaft has several blades, and one end of the connecting shaft is connected to the output end of the agitator motor. The agitator motor is connected to the agitator housing. The agitator housing has several connecting ports, and each connecting port is equipped with a port valve. The connecting ports are respectively connected to the waste liquid storage tank, the material storage and transportation module, and the hydrothermal liquefaction and water circulation module through pipelines. The agitator motor and the port valves are respectively connected to the control module.

[0015] In the above scheme, the material storage and transportation module includes a slurry storage tank, a liquid water storage tank, a three-plunger pump, and a heating pipe;

[0016] The slurry storage tank is connected to a three-plunger pump via a slurry transport pipe, which is equipped with a first shut-off valve and a first metering pump. The liquid water storage tank is connected to the three-plunger pump via a water transport pipe, which is equipped with a second shut-off valve and a first hydraulic double-diaphragm metering pump. The three-plunger pump is connected to a heating pipe via a mixed material transport pipe, which is equipped with a flow meter. The heating pipe is connected to a high-pressure filter agitator. The first metering pump, the first shut-off valve, the first hydraulic double-diaphragm metering pump, the second shut-off valve, the three-plunger pump, the flow meter, and the heating pipe are all connected to the control module.

[0017] In the above scheme, the hydrothermal liquefaction and water circulation module includes a preheating pipe, a reaction pipe, an explosion-proof plate, a two-stage heat exchanger, and a water storage tank;

[0018] One end of the preheating pipe is connected to each high-pressure filter stirrer via a pipeline, and the other end of the preheating pipe is connected to a two-stage heat exchanger via a reaction pipe. The two-stage heat exchanger is connected to the hydrothermal liquefaction product separation module. The pretreated mixture output from each high-pressure filter stirrer is preheated by the preheating pipe and then undergoes hydrothermal liquefaction reaction in the reaction pipe to obtain hydrothermal liquefaction products. The hydrothermal liquefaction products enter the hydrothermal liquefaction product separation system through the two-stage heat exchanger. The water storage tank is connected to the high-pressure filter stirrer via a water supply pipe, which is also connected to the two-stage heat exchanger. A third shut-off valve is installed on the water supply pipe, which is connected to the control module. Water in the water storage tank enters the high-pressure filter stirrer through the two-stage heat exchanger and the water supply pipe. The explosion-proof plate is installed on the pipeline connecting the reaction pipe and the two-stage heat exchanger.

[0019] In the above scheme, the hydrothermal liquefaction product separation module includes a high-pressure filter, a solid product collection tank, a product separator, and a liquid product storage tank;

[0020] The high-pressure filter is connected to the solid product collection tank, the product separator is connected to the liquid product storage tank, the high-pressure filter is connected to the two-stage heat exchanger through the hydrothermal liquefaction product conveying pipe, the product separator is connected to the high-pressure filter through the liquid-gas phase product conveying pipe, and the product separator is equipped with an air filter.

[0021] The above plan also includes gas cylinders;

[0022] The gas cylinder is installed on the pipeline between the two-stage heat exchanger and the high-pressure filter. A first back pressure valve and a pressure relief valve are provided at the connection point. The first back pressure valve and the pressure relief valve are respectively connected to the control module.

[0023] In the above scheme, the material storage and transportation module, the alternating stirring module, the hydrothermal liquefaction and water circulation module, and the hydrothermal liquefaction product separation module are connected sequentially; the control module is connected to the material storage and transportation module, the alternating stirring module, the hydrothermal liquefaction and water circulation module, and the hydrothermal liquefaction product separation module respectively; the material storage and transportation module stores materials and liquids respectively, mixes them, and heats them into a mixture; the mixture enters the alternating stirring module in batches, the alternating stirring module pre-treats the mixture, and the pre-treated mixture enters the hydrothermal liquefaction and water circulation module sequentially; the hydrothermal liquefaction and water circulation module performs a hydrothermal liquefaction reaction on the pre-treated mixture to obtain hydrothermal liquefaction products; the hydrothermal liquefaction products enter the hydrothermal liquefaction product separation module, the hydrothermal liquefaction product separation module separates the hydrothermal liquefaction products to obtain solid phase products and liquid phase products, which are then stored separately.

[0024] A control method for a continuous segmented hydrothermal liquefaction system includes the following steps:

[0025] S1: The control module controls the first and second shut-off valves to open sequentially, thereby mixing the materials and liquids in the slurry storage tank and liquid water storage tank with the liquid in the pipeline at the three-plunger pump. The mixed materials are then heated by the heating pipe.

[0026] S2: The control module controls the flow direction of the heated mixture by controlling the shut-off valves corresponding to each high-pressure filter agitator. The heated mixture enters each high-pressure filter agitator for pretreatment according to a preset time and a preset order. The pretreatment steps of each high-pressure filter agitator are the same. The pretreated mixture is discharged from the high-pressure filter agitator and enters the corresponding pipeline in sequence to achieve continuous operation.

[0027] S3: The pretreated mixture is heated by the preheating tube and then enters the reaction tube to begin the hydrothermal liquefaction reaction;

[0028] S4: The mixture after the hydrothermal liquefaction reaction is cooled by a two-stage heat exchanger to obtain the hydrothermal liquefaction product. The hydrothermal liquefaction product is then separated into solid product, liquid product and gaseous product by passing through a high-pressure filter and a product separator. The solid product enters the high-pressure product collection tank, the liquid product enters the liquid product storage tank, and the gaseous product is directly discharged into the air after being filtered by an air filter.

[0029] In the above scheme, step S2 includes the following steps:

[0030] S2.1: The control module controls the opening of the shut-off valve corresponding to the high-pressure filter agitator in the preset first sequence. The heated mixture enters the high-pressure filter agitator for settling and stratification. After settling for a preset time, the control module controls the opening of the corresponding connection port of the waste liquid storage tank to allow the upper waste liquid to flow into the waste liquid storage tank.

[0031] S2.2: The control module controls the third shut-off valve to open, so that the liquid in the water storage tank enters the high-pressure filter agitator through the water supply pipe. The control module controls the agitator motor to turn on, so that the liquid and the mixture are fully mixed. After the preset time is reached, the control module controls the corresponding shut-off valve to open, so that the evenly mixed mixture is discharged from the high-pressure filter agitator and enters the preheating pipe through the pipeline.

[0032] The above scheme also includes the following steps:

[0033] S2.3: When the current high-pressure filter agitator completes step S2.1, the control module controls the next high-pressure filter agitator to start step S2.1, so that each high-pressure filter agitator discharges the pretreated mixture in sequence and enters the preheating tube through the pipeline in sequence, thereby realizing the continuous operation of the system.

[0034] Compared with the prior art, the beneficial effects of the present invention are:

[0035] 1. This invention enables continuous operation of a two-stage hydrothermal liquefaction reactor through an alternating stirring module. In particular, the steps of pretreatment material separation, hydrothermal liquefaction material preparation, and hydrothermal liquefaction material conveying improve operational efficiency, reduce system failure rate, and enable two-stage hydrothermal liquefaction to be applied in medium and large-scale industries.

[0036] 2. This invention enables the migration of various impurities from the solid phase product to the liquid phase after pretreatment through a pretreatment device and a material separation device after pretreatment, thereby reducing the absolute content of impurities in the hydrothermal liquefaction material and achieving the purpose of improving the quality of biomass pretreatment as required by low-temperature hydrothermal pretreatment. It can perform two-stage hydrothermal liquefaction of various biomass raw materials, thus improving the applicability of this system.

[0037] 3. The two-stage heat exchange of the present invention simultaneously achieves the cooling of hydrothermal liquefaction products and the preheating of water for preparing hydrothermal liquefaction materials, thereby improving the energy utilization rate of the system and reducing the overall system cost.

[0038] One aspect of the present invention does not necessarily have all the effects described above. Effects other than those described above can be readily seen and extracted from the description, drawings, claims, etc. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of a continuous segmented hydrothermal liquefaction system according to an embodiment of the present invention.

[0040] Figure 2 This is a schematic diagram of the alternating stirring module structure according to one embodiment of the present invention.

[0041] Figure 3 This is a schematic diagram of the material storage and transportation module according to one embodiment of the present invention.

[0042] Figure 4 This is a structural diagram of a hydrothermal liquefaction and water circulation module and a hydrothermal liquefaction product separation module according to an embodiment of the present invention.

[0043] Figure 5 This is a schematic diagram of a high-pressure filter stirrer according to an embodiment of the present invention.

[0044] In the diagram: 1. Slurry storage tank; 2. Slurry conveying pipe; 3. First metering pump; 4. First shut-off valve; 5. Water storage tank; 6. Water conveying pipe; 7. First hydraulic double diaphragm metering pump; 8. Second shut-off valve; 9. Three-plunger pump; 10. Mixed material conveying pipe; 11. Flow meter; 12. Electromagnetic heating coil; 13. Heating tube; 14. Pre-treatment material conveying main pipe; 15. Shut-off valve; 16. Pre-treatment material conveying pipe; 17. Agitator motor; 18. High-pressure filter agitator; 19. Blade; 20. Water injection pipe; 21. Water injection pipe; 22. Waste liquid output pipe; 23. Hydrothermal liquefaction material output pipe; 24. Third shut-off valve; 25. Waste liquid output main pipe; 26. Waste liquid storage tank; 27. Hydrothermal liquefaction material conveying... 28. Main pipe; 29. ​​Preheating pipe; 30. Reaction pipe; 31. Explosion-proof diaphragm; 32. Two-stage heat exchanger; 33. Water supply pipe; 34. Second hydraulic double diaphragm metering pump; 35. Water storage tank; 36. Gas cylinder; 37. First back pressure valve; 38. Pressure relief valve; 49. Hydrothermal liquefaction product conveying pipe; 40. High-pressure filter; 41. Solid phase product conveying pipe; 42. High-pressure filter valve; 43. Solid phase product collection tank; 44. Liquid-gas phase product conveying pipe; 45. Second back pressure valve; 46. Air filter; 47. Product separator; 48. Liquid phase product conveying pipe; 49. Ball valve; 50. Liquid phase product storage tank; 51. Connecting shaft; 52. First port; 53. Second port; 54. Third port; 55. Fourth port. Detailed Implementation

[0045] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0046] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "front," "rear," "left," "right," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the 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, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0047] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] Figure 1 The above is a preferred embodiment of the continuous segmented hydrothermal liquefaction system, which includes a material storage and transportation module, an alternating stirring module, a hydrothermal liquefaction and water circulation module, a hydrothermal liquefaction product separation module, and a control module.

[0049] The material storage and transportation module, alternating stirring module, hydrothermal liquefaction and water circulation module, and hydrothermal liquefaction product separation module are connected in sequence. The control module is connected to the material storage and transportation module, alternating stirring module, hydrothermal liquefaction and water circulation module, and hydrothermal liquefaction product separation module respectively. The material storage and transportation module is used to store materials and liquids separately, mix them, and heat them into a mixture. The mixture enters the alternating stirring module in batches. The alternating stirring module is used to pre-treat the mixture. The pre-treated mixture enters the hydrothermal liquefaction and water circulation module in sequence. The hydrothermal liquefaction and water circulation module is used to perform a hydrothermal liquefaction reaction on the pre-treated mixture to obtain hydrothermal liquefaction products. The hydrothermal liquefaction products enter the hydrothermal liquefaction product separation module. The hydrothermal liquefaction product separation module is used to separate the hydrothermal liquefaction products to obtain solid phase products and liquid phase products, which are then stored separately.

[0050] like Figure 2 As shown, the alternating stirring module includes several high-pressure filter stirrers 18 and a waste liquid storage tank 26. Each high-pressure filter stirrer 18 is connected to the waste liquid storage tank 26. Each high-pressure filter stirrer 18 is connected to the material storage and transportation module and the hydrothermal liquefaction and water circulation module, respectively. Each high-pressure filter stirrer 18 is equipped with a shut-off valve 15 at the connection between it and the material storage and transportation module. The control module controls the mixed materials to enter each high-pressure filter stirrer 18 in batches for processing and then enter the hydrothermal liquefaction and water circulation module in sequence. The waste liquid filtered by the high-pressure filter stirrer 18 flows from each waste liquid output pipe 22 into the waste liquid output main pipe 25 and then into the waste liquid storage tank 26.

[0051] like Figure 5 As shown, preferably, the high-pressure filter agitator 18 includes an agitator motor 17, blades 19, a connecting shaft 50, and an agitator housing;

[0052] The blades 19 and the connecting shaft 50 are located inside the agitator housing. The connecting shaft 50 is provided with several blades 19. One end of the connecting shaft 50 is connected to the output end of the agitator motor 17. The agitator motor 17 is connected to the agitator housing. The agitator housing is provided with several connecting pipe ports. Each connecting pipe port is provided with a pipe port valve. The connecting pipe ports are respectively connected to the waste liquid storage tank 26, the material storage and transportation module, and the hydrothermal liquefaction and water circulation module through pipelines. The agitator motor 17 and the pipe port valves are respectively connected to the control module.

[0053] According to one embodiment of the present invention, preferably, the number of high-pressure filter stirrers 18 is 3.

[0054] According to one embodiment of the present invention, preferably, the agitator shell includes four ports: a first port 51 located on the side of the material storage and transportation module, a second port 52 located slightly above the side of the hydrothermal liquefaction and water circulation module, a third port 53 located slightly below the side of the hydrothermal liquefaction and water circulation module, and a fourth port located at the bottom of the agitator shell.

[0055] After pretreatment, the mixture enters the hydrothermal liquefaction material output pipe 23 through the fourth port of each high-pressure filter agitator 18, then enters the hydrothermal liquefaction material output main pipe 27, and finally enters the preheating pipe 28 in the hydrothermal liquefaction and water circulation module.

[0056] like Figure 3 As shown, preferably, the material storage and transportation module includes a slurry storage tank 1, a liquid water storage tank 5, a three-plunger pump 9, and a heating pipe 13;

[0057] The slurry storage tank 1 is connected to the three-plunger pump 9 via the slurry transport pipe 2. The slurry transport pipe 2 is equipped with a first shut-off valve 4 and a first metering pump 3. The liquid water storage tank 5 is connected to the three-plunger pump 9 via the water transport pipe 6. The water transport pipe 6 is equipped with a second shut-off valve 8 and a first hydraulic double diaphragm metering pump 7. The three-plunger pump 9 is connected to the heating pipe 13 via the mixed material transport pipe 10. The mixed material transport pipe 10 is equipped with a flow meter 11. The heating pipe 13 is connected to the high-pressure filter agitator 18. The first metering pump 3, the first shut-off valve 4, the first hydraulic double diaphragm metering pump 7, the second shut-off valve 8, the three-plunger pump 9, the flow meter 11, and the heating pipe 13 are connected to the respective control modules. The mixed material heated by the heating pipe 13 passes sequentially through the pretreatment material transport main pipe 14, the shut-off valve 15, and the pretreatment material transport pipe 16 to reach each high-pressure filter agitator 18.

[0058] Preferably, the heating tube 13 is provided with an electromagnetic heating coil 12, which heats the heating tube 13.

[0059] like Figure 4As shown, preferably, the hydrothermal liquefaction and water circulation module includes a preheating pipe 28, a reaction pipe 29, a two-stage heat exchanger 31, and a water storage tank 34;

[0060] One end of the preheating pipe 28 is connected to each high-pressure filter stirrer 18, and the other end of the preheating pipe 28 is connected to a two-stage heat exchanger 31 through a reaction pipe 29. The two-stage heat exchanger 31 is connected to the hydrothermal liquefaction product separation module. The pretreated mixture output from each high-pressure filter stirrer 18 is preheated by the preheating pipe 28 and then undergoes a hydrothermal liquefaction reaction in the reaction pipe 29 to obtain hydrothermal liquefaction products. The hydrothermal liquefaction products enter the hydrothermal liquefaction product separation system through the two-stage heat exchanger 31. The water storage tank 34 is connected to the high-pressure filter stirrer 18 through a water supply pipe 32. The filter agitator 18 is connected, and the water supply pipe 32 is also connected to the two-stage heat exchanger 31. The water supply pipe 32 is equipped with a third shut-off valve 24, which is connected to the control module. A second hydraulic double diaphragm metering pump 33 is installed on the pipeline between the water storage tank 34 and the two-stage heat exchanger 31. The water in the water storage tank 34 passes through the second hydraulic double diaphragm metering pump 33 and the two-stage heat exchanger 31, and then continues to flow along the water supply pipe 32 through the third shut-off valve 24 before entering each high-pressure filter agitator 18 from the water injection pipe 21.

[0061] Preferably, the product obtained in the hydrothermal liquefaction and water circulation system is cooled by a two-stage heat exchanger 31, wherein heat is supplied to the water used to prepare the hydrothermal liquefaction material for preliminary preheating and to reduce heat loss.

[0062] Preferably, it also includes an explosion-proof sheet 30 to prevent overpressure damage to the system;

[0063] The explosion-proof plate 30 is installed on the pipeline connecting the reaction tube 29 and the two-stage heat exchanger 31.

[0064] Preferably, the hydrothermal liquefaction product separation module includes a high-pressure filter 39, a solid product collection tank 42, a product separator 46, and a liquid product storage tank 49.

[0065] The high-pressure filter 39 is connected to the solid product collection tank 42. A high-pressure filter valve 41 is provided on the pipeline connecting the high-pressure filter 39 and the solid product collection tank 42. The product separator 46 is connected to the liquid product storage tank 49. An air filter 45 is provided in the product separator 46. A second back pressure valve 44 is provided on the pipeline connecting the product separator 46 and the high-pressure filter 39. A ball valve 48 is provided on the pipeline connecting the product separator 46 and the liquid product storage tank 49. The hydrothermal liquefaction product passes through the two-stage heat exchanger 31 and then sequentially through the high-pressure filter 39 and the product separator 46. The solid product filtered out by the high-pressure filter 39 is stored in the solid product collection tank 42. The hydrothermal liquefaction product is separated into liquid product and gaseous product by the product separator 46. The gaseous product is discharged into the environment after being treated by the air filter 45, and the liquid product is stored in the liquid product storage tank 49.

[0066] Preferably, the pipeline between the high-pressure filter 39 and the two-stage heat exchanger 31 is a hydrothermal liquefaction product conveying pipe 38, the pipeline between the high-pressure filter 39 and the product separator 46 is a liquid-gas phase product conveying pipe 43, and the pipeline between the product separator 46 and the liquid phase product storage tank 49 is a liquid phase product conveying pipe 47.

[0067] Preferably, it also includes gas cylinder 35;

[0068] The gas cylinder 35 is installed on the pipeline between the two-stage heat exchanger 31 and the high-pressure filter 39. A first back pressure valve 36 is provided at the connection point. A pressure relief valve 37 is installed on the hydrothermal liquefaction product conveying pipe 38. The first back pressure valve 36 and the pressure relief valve 37 are connected to the control module. After the gaseous product is discharged into the environment, the control module controls the opening and closing of the first back pressure valve 36 and the pressure relief valve 37 to open or close the gas cylinder 35, so that the pressure in the system is equal to the atmospheric pressure.

[0069] A control method for a continuous segmented hydrothermal liquefaction system includes the following steps:

[0070] S1: The control module controls the first shut-off valve 4 and the second shut-off valve 8 to open in sequence, thereby mixing the material and liquid in the slurry storage tank 1 and the liquid water storage tank 5 in the pipeline at the three-plunger pump 9, and the mixed material is heated by the heating pipe 13.

[0071] S2: The control module controls the flow direction of the heated mixture by controlling the shut-off valve 15 corresponding to each high-pressure filter agitator 18. The heated mixture enters each high-pressure filter agitator 18 for pretreatment according to a preset time and a preset order. The pretreatment steps of each high-pressure filter agitator 18 are the same. The pretreated mixture is discharged from the high-pressure filter agitator 18 and enters the corresponding pipeline in sequence to achieve continuous operation.

[0072] S3: The pretreated mixture is heated by the preheating tube 28 and then enters the reaction tube 29 to start the hydrothermal liquefaction reaction;

[0073] S4: The mixture after the hydrothermal liquefaction reaction is cooled by a two-stage heat exchanger 31 to obtain the hydrothermal liquefaction product. The hydrothermal liquefaction product is separated into solid product, liquid product and gaseous product by passing through a high-pressure filter 39 and a product separator 46 in sequence. The solid product enters the high-pressure product collection tank 42, the liquid product enters the liquid product storage tank 49, and the gaseous product is directly discharged into the air after being filtered by an air filter 45.

[0074] Preferably, step S2 includes the following steps:

[0075] S2.1: The control module controls the opening of the shut-off valve 15 corresponding to the high-pressure filter agitator 18 in the preset first sequence. The heated mixture enters the high-pressure filter agitator 18 for settling and stratification. After settling for a preset time, the control module controls the opening of the connection port corresponding to the waste liquid storage tank 26 to allow the upper waste liquid to flow into the waste liquid storage tank 26.

[0076] S2.2: The control module controls the third shut-off valve 24 to open, so that the liquid in the water storage tank 34 enters the high-pressure filter agitator 18 through the water supply pipe 32. The control module controls the agitator motor 17 to open, so that the liquid and the mixture are fully mixed. After the preset time is reached, the control module controls the corresponding shut-off valve 15 to open, so that the evenly mixed mixture is discharged from the high-pressure filter agitator 18 and enters the preheating pipe through the pipeline.

[0077] Preferably, the following steps are also included:

[0078] S2.3: When the current high-pressure filter agitator 18 completes step S2.1, the control module controls the next high-pressure filter agitator 18 to start step S2.1, so that each high-pressure filter agitator 18 discharges the pre-treated mixture in sequence and enters the preheating tube through the pipeline in sequence, thereby realizing the continuous operation of the system.

[0079] In the material storage and transportation system, some components of the pre-treated material are separated from the liquid phase in the pre-treatment and hydrothermal liquefaction material preparation and transportation system. Only the solid phase product is used for subsequent hydrothermal liquefaction after being mixed with water provided by the water storage tank 34.

[0080] After the pretreated materials are separated in a high-pressure filter stirrer, the absolute content of N, O, Cl and alkaline earth metals in the solid products can be effectively reduced and migrated to the liquid phase, thus achieving preliminary upgrading of the raw materials.

[0081] Preferably, the pretreatment process of the alternating stirring module during operation is divided into a material separation cycle, a hydrothermal liquefaction material preparation cycle, and a hydrothermal liquefaction material conveying cycle.

[0082] Example 1

[0083] During system operation, deionized water pre-stored in water storage tank 5 enters three-plunger pump 9 through pre-pressurization by the first hydraulic double diaphragm metering pump 7. The three-plunger pump 9 further pressurizes the pressure in the material storage and transportation module pipeline to 25MPa. When the flow meter 11 detects that the mass flow rate in the material storage and transportation module is stable at about 10Kg / h, the first shut-off valve 4 after the first hydraulic double diaphragm metering pump 7 is closed, and the valve of the slurry storage tank 1 is opened. The pre-prepared microalgae slurry stored therein is transported by the slurry delivery pipe 2 and mixed with deionized water in the pipeline at the three-plunger pump 9 after being pressurized by the first metering pump 3. It then enters the three-plunger pump 9 and begins to flow continuously. At the same time, the control module controls the three-plunger pump 9 to keep the flow rate in the flow meter 11 at about 10Kg / h.

[0084] The mixture of microalgae slurry and deionized water is transported to the heating tube 13 through the main mixing pipe 10. Before the mixture enters the heating tube 13, the electromagnetic heating coil 12 is activated and the heating power is adjusted so that the temperature of the mixture flowing out of the heating tube 13 is 200°C. At the same time, the shut-off valve 15 connected to the first-order high-pressure filter agitator 18 in the alternating stirring module is opened. The first port 51 and the third port 53 of the first-order high-pressure filter agitator 18 are opened, and the fourth port 54 and the second port 52 are closed. All ports of the second and third-order high-pressure filter agitators 18 are closed, and the shut-off valve 15 connected to the second and third-order high-pressure filter agitators 18 is opened.

[0085] After the mixture completes the heating part of the pretreatment process while flowing along the heating pipe 13, it enters the first high-pressure filter agitator 18 through the first port 51 of the first high-pressure filter agitator 18 via the pretreatment material conveying main pipe 14, the shut-off valve 15 connected to the first high-pressure filter agitator 18, and the pretreatment material conveying pipe 16 connected to the first high-pressure filter agitator 18, thus beginning the material separation cycle described in the invention, i.e., settling. After settling, the waste liquid portion of the material flows out through the third port 53 and enters the waste liquid storage tank 26 through the waste liquid output pipe 22 and the waste liquid output main pipe 25 connected to the first high-pressure filter agitator 18. This pretreatment separation cycle takes 5 minutes, with the zero point being when the pretreated material begins to enter the first high-pressure filter agitator 18 through the first port 51.

[0086] After the pretreatment separation cycle in the first-order high-pressure filter agitator 18 is completed, the shut-off valve 15 connected to the first-order high-pressure filter agitator 18 is closed, and the first port 51, fourth port 54, and third port 53 of the first-order high-pressure filter agitator 18 are closed. The shut-off valve 24 is opened, and the hydrothermal liquefaction material preparation cycle described in the invention begins. Water in the water storage tank 34 flows through the second hydraulic double diaphragm metering pump 33, water supply pipe 32, shut-off valve 24, and water supply pipe 20, and enters the first-order high-pressure filter agitator 18 through the second port 52. At the same time, the agitator motor 17 of the first-order high-pressure filter agitator 18 starts and drives the blades 19 to uniformly mix the pretreated solid phase of the material remaining in the first-order high-pressure filter agitator 18 with the liquid entering through the second port 52, thus preparing the hydrothermal liquefaction material. The hydrothermal liquefaction material preparation cycle of the first-order high-pressure filter agitator 18 takes 5 minutes. At the 5th minute, the shut-off valve 15 connected to the second-order high-pressure filter agitator 18 is opened, and the pre-treated material begins to enter the second-order high-pressure filter agitator 18. Then, the material separation cycle in the second-order high-pressure filter agitator 18 is completed in the same process and time as the material separation cycle in the first-order high-pressure filter agitator 18.

[0087] After the first-stage high-pressure filter agitator 18 completes its hydrothermal liquefaction material preparation cycle, the first port 51, the second port 52, and the third port 53 of the first-stage high-pressure filter agitator 18 are closed, the agitator motor 17 stops, and the heating sections of the preheating pipe 28 and the reaction pipe 29 begin operation, initiating the hydrothermal liquefaction material conveying cycle. Under the influence of gravity, the hydrothermal liquefaction material flows out through the fourth port 54, passes through the hydrothermal liquefaction material output pipe 23 and the hydrothermal liquefaction material output main pipe 27 connected to the first-stage high-pressure filter agitator 18, and after preheating in the preheating pipe 28, enters the reaction pipe 29 to begin the hydrothermal liquefaction reaction. The first-stage high-pressure filter agitator 18's hydrothermal liquefaction material conveying cycle takes 5 minutes. At the 10th minute, the second-stage high-pressure filter agitator 18 completes its hydrothermal liquefaction material preparation cycle using the same process and time as the first-stage high-pressure filter agitator 18. The deionized water used for hydrothermal liquefaction preparation enters the second-stage high-pressure filter agitator 18 via the second hydraulic double-diaphragm metering pump 33, water supply pipe 32, shut-off valve 24, and water injection pipe 21. At the 10th minute, the shut-off valve 15 connected to the third-stage high-pressure filter agitator 18 opens, and the pre-treated material begins to enter the third-stage high-pressure filter agitator 18. The third-stage high-pressure filter agitator 18 then completes its material separation cycle using the same process and time as the first-stage high-pressure filter agitator 18.

[0088] At the 15-minute mark, the first-sequence high-pressure filter agitator 18 begins a new material separation cycle, with the same process and time as the material separation cycle performed in the previous 5 minutes. Simultaneously, the second-sequence high-pressure filter agitator 18 begins a hydrothermal liquefaction material conveying cycle, with the same process and time as the hydrothermal liquefaction material conveying cycle performed in the first-sequence high-pressure filter agitator 18 during the 10-15 minute period. The third-sequence high-pressure filter agitator 18 begins a hydrothermal liquefaction material preparation cycle, with the same process and time as the hydrothermal liquefaction material preparation cycle performed in the second-sequence high-pressure filter agitator 18 during the 10-15 minute period. Subsequently, the first, second, and third-sequence high-pressure filter agitators 18 will operate in a 5-minute cycle, alternating between the "material separation cycle – hydrothermal liquefaction material preparation cycle – hydrothermal liquefaction material conveying cycle," achieving continuous pre-treatment material processing and hydrothermal liquefaction.

[0089] The hydrothermal liquefaction material prepared in the alternating stirring module flows through the hydrothermal liquefaction material output pipes 23 and the main hydrothermal liquefaction material output pipe 27 of each high-pressure filter stirrer 18. After being preheated in the preheating pipe 28, it enters the reaction pipe 29 to begin the hydrothermal liquefaction reaction. The designed hydrothermal liquefaction temperature is 350℃, and the hydrothermal liquefaction material will reach 350℃ when it flows out of the reaction pipe 29. After flowing out of the reaction pipe 29, the hydrothermal liquefaction material first undergoes product cooling in the two-stage heat exchanger 31, and the product will be cooled to 90℃ when it flows out of the two-stage heat exchanger.

[0090] After cooling, the hydrothermal liquefaction material is called hydrothermal liquefaction product. First, the high-pressure filter valve 41 is opened, and the hydrothermal liquefaction product flows into the high-pressure filter 39. The solid phase product is separated from the liquid phase product under pressure and enters the high-pressure product collection tank 42 along the high-pressure product conveying pipe 40, realizing the separation of the solid phase product in the hydrothermal liquefaction product separation. After the solid phase product separation is completed, the remaining product enters the liquid-gas phase product conveying pipe 43. The second back pressure valve 44 reduces the pressure to atmospheric pressure, and then the remaining product enters the product separator 46. The gas phase product first enters the atmosphere directly through the air filter 45. Then the gas cylinder 35 is opened, and the pressure is stabilized at near atmospheric pressure with the help of the first back pressure valve 36 and the pressure relief valve 37. Finally, the gas cylinder 35, the first back pressure valve 36 and the pressure relief valve 37 are closed, the ball valve 48 is opened, and the liquid phase product enters the liquid phase product storage tank 49 through the liquid phase product conveying pipe 47 for storage and later use.

[0091] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0092] The detailed descriptions listed above are merely specific illustrations of feasible embodiments of the present invention and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. A continuous segmented hydrothermal liquefaction system, characterized in that, It includes a material storage and transportation module, an alternating stirring module, a hydrothermal liquefaction and water circulation module, a hydrothermal liquefaction product separation module, and a control module; The material storage and transportation module, alternating stirring module, hydrothermal liquefaction and water circulation module, and hydrothermal liquefaction product separation module are connected in sequence. The control module is connected to the material storage and transportation module, alternating stirring module, hydrothermal liquefaction and water circulation module, and hydrothermal liquefaction product separation module respectively. The material storage and transportation module is used to store materials and liquids separately, mix them, and heat them into a mixture. The mixture enters the alternating stirring module in batches. The alternating stirring module is used to pre-treat the mixture. The pre-treated mixture enters the hydrothermal liquefaction and water circulation module in sequence. The hydrothermal liquefaction and water circulation module is used to perform a hydrothermal liquefaction reaction on the pre-treated mixture to obtain hydrothermal liquefaction products. The hydrothermal liquefaction products enter the hydrothermal liquefaction product separation module. The hydrothermal liquefaction product separation module is used to separate the hydrothermal liquefaction products to obtain solid products and liquid products, which are then stored separately. The alternating stirring module includes several high-pressure filter stirrers (18) and a waste liquid storage tank (26). Each high-pressure filter stirrer (18) is connected to the waste liquid storage tank (26). Each high-pressure filter stirrer (18) is connected to the material storage and transportation module and the hydrothermal liquefaction and water circulation module respectively. Each high-pressure filter stirrer (18) is equipped with a shut-off valve (15) at the connection between it and the material storage and transportation module. The control module controls the mixed materials to enter each high-pressure filter stirrer (18) in batches for processing and then enter the hydrothermal liquefaction and water circulation module in sequence. The waste liquid filtered by the high-pressure filter stirrer (18) enters the waste liquid storage tank (26). The control module controls the opening of the shut-off valve (15) corresponding to the high-pressure filter stirrer (18) in the preset first sequence. The heated mixture enters the high-pressure filter stirrer (18) for static stratification. After static stratification for a preset time, the control module controls the opening of the connecting pipe corresponding to the waste liquid storage tank (26) so that the upper waste liquid flows into the waste liquid storage tank (26). The control module controls the third shut-off valve (24) to open, so that the liquid in the water storage tank (34) enters the high-pressure filter agitator (18) through the water supply pipe (32). The control module controls the agitator motor (17) to open, so that the liquid and the mixture are fully mixed. After the mixture is stirred for a preset time, the control module controls the corresponding shut-off valve (15) to open, so that the mixed mixture is discharged from the high-pressure filter agitator (18) and enters the preheating pipe (28) through the pipeline. When the previous high-pressure filter agitator (18) finishes, the control module controls the next high-pressure filter agitator (18) to start, so that each high-pressure filter agitator (18) discharges the pretreated mixture in sequence and enters the preheating pipe (28) in sequence through the pipeline, thereby realizing the continuous operation of the system; The pretreated mixture is heated by the preheating tube (28) and then enters the reaction tube (29) to start the hydrothermal liquefaction reaction.

2. The continuous segmented hydrothermal liquefaction system according to claim 1, characterized in that, The high-pressure filter agitator (18) includes an agitator motor (17), blades (19), a connecting shaft (50), and an agitator housing; The blades (19) and connecting shaft (50) are located inside the agitator housing. The connecting shaft (50) is provided with several blades (19). One end of the connecting shaft (50) is connected to the output end of the agitator motor (17). The agitator motor (17) is connected to the agitator housing. The agitator housing is provided with several connecting pipe ports. Each connecting pipe port is provided with a pipe port valve. The connecting pipe ports are respectively connected to the waste liquid storage tank (26), the material storage and transportation module, and the hydrothermal liquefaction and water circulation module through pipelines. The agitator motor (17) and the pipe port valves are respectively connected to the control module.

3. The continuous segmented hydrothermal liquefaction system according to claim 1, characterized in that, The material storage and transportation module includes a slurry storage tank (1), a liquid water storage tank (5), a three-plunger pump (9), and a heating pipe (13). The slurry storage tank (1) is connected to the three-plunger pump (9) through the slurry transport pipe (2). The slurry transport pipe (2) is equipped with a first shut-off valve (4) and a first metering pump (3). The liquid water storage tank (5) is connected to the three-plunger pump (9) through the water transport pipe (6). The water transport pipe (6) is equipped with a second shut-off valve (8) and a first hydraulic double diaphragm metering pump (7). The three-plunger pump (9) is connected to the heating pipe (13) through the mixed material transport pipe (10). The mixed material transport pipe (10) is equipped with a flow meter (11). The heating pipe (13) is connected to the high-pressure filter stirrer (18). The first metering pump (3), the first shut-off valve (4), the first hydraulic double diaphragm metering pump (7), the second shut-off valve (8), the three-plunger pump (9), the flow meter (11), and the heating pipe (13) are respectively connected to the control module.

4. The continuous segmented hydrothermal liquefaction system according to claim 1, characterized in that, The hydrothermal liquefaction and water circulation module includes a preheating pipe (28), a reaction pipe (29), an explosion-proof plate (30), a two-stage heat exchanger (31), and a water storage tank (34). One end of the preheating pipe (28) is connected to each high-pressure filter stirrer (18) via a pipeline, and the other end of the preheating pipe (28) is connected to the two-stage heat exchanger (31) via the reaction pipe (29). The two-stage heat exchanger (31) is connected to the hydrothermal liquefaction product separation module. The pretreated mixture output from each high-pressure filter stirrer (18) is preheated by the preheating pipe (28) and then undergoes hydrothermal liquefaction reaction in the reaction pipe (29) to obtain hydrothermal liquefaction products. The hydrothermal liquefaction products enter the hydrothermal liquefaction product separation module through the two-stage heat exchanger (31). In the material separation system, the water storage tank (34) is connected to the high-pressure filter stirrer (18) through the water supply pipe (32). The water supply pipe (32) is also connected to the two-stage heat exchanger (31). A third shut-off valve (24) is provided on the water supply pipe (32). The third shut-off valve (24) is connected to the control module. The water in the water storage tank (34) enters the high-pressure filter stirrer (18) through the two-stage heat exchanger (31) and the water supply pipe (32). The explosion-proof plate (30) is installed on the pipeline connecting the reaction pipe (29) and the two-stage heat exchanger (31).

5. The continuous segmented hydrothermal liquefaction system according to claim 4, characterized in that, The hydrothermal liquefaction product separation module includes a gas cylinder (35), a high-pressure filter (39), a solid product collection tank (42), a product separator (46), and a liquid product storage tank (49). The high-pressure filter (39) is connected to the solid product collection tank (42), the product separator (46) is connected to the liquid product storage tank (49), the high-pressure filter (39) is connected to the two-stage heat exchanger (31) through the hydrothermal liquefaction product conveying pipe (38), the product separator (46) is connected to the high-pressure filter (39) through the liquid-gas phase product conveying pipe (43), the product separator (46) is equipped with an air filter (45), the gas cylinder (35) is installed on the hydrothermal liquefaction product conveying pipe (38), the connection is equipped with a first back pressure valve (36), the pressure relief valve (37) is installed on the hydrothermal liquefaction product conveying pipe (38), and the first back pressure valve (36) and the pressure relief valve (37) are respectively connected to the control module.

6. A control method for a continuous segmented hydrothermal liquefaction system according to any one of claims 1-5, characterized in that, Includes the following steps: The material storage and transportation module stores materials and liquids respectively, mixes them, and heats them into a mixture. The mixture is fed into the alternating stirring module in batches, where it is pretreated. The pretreated mixture is then fed into the hydrothermal liquefaction and water circulation module, where it undergoes a hydrothermal liquefaction reaction to obtain hydrothermal liquefaction products. These products are then fed into the hydrothermal liquefaction product separation module, where they are separated into solid and liquid phases and stored separately.

7. The control method for a continuous segmented hydrothermal liquefaction system according to claim 6, characterized in that, Specifically, the following steps are included: S1: The control module controls the first shut-off valve (4) and the second shut-off valve (8) to open in sequence, thereby mixing the material and liquid in the slurry storage tank (1) and the liquid water storage tank (5) in the pipeline at the three-plunger pump (9), and the mixed material is heated by the heating pipe (13); S2: The control module controls the flow direction of the heated mixture by controlling the shut-off valve (15) corresponding to each high-pressure filter agitator (18). The heated mixture enters each high-pressure filter agitator (18) for pretreatment according to a preset time and a preset order. The pretreatment steps of each high-pressure filter agitator (18) are the same. The pretreated mixture is discharged from the high-pressure filter agitator (18) and enters the corresponding pipeline in sequence to achieve continuous operation. S3: The pretreated mixture is heated by the preheating tube (28) and then enters the reaction tube (29) to start the hydrothermal liquefaction reaction; S4: The mixture after hydrothermal liquefaction reaction is cooled by a two-stage heat exchanger (31) to obtain hydrothermal liquefaction products. The hydrothermal liquefaction products are separated into solid products, liquid products and gaseous products by passing through a high-pressure filter (39) and a product separator (46). The solid products enter the solid product collection tank (42), the liquid products enter the liquid product storage tank (49), and the gaseous products are directly discharged into the air after being filtered by an air filter (45).

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