CN113429993A - Continuous hydrothermal liquefaction system and method - Google Patents
Continuous hydrothermal liquefaction system and method Download PDFInfo
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- CN113429993A CN113429993A CN202110842912.3A CN202110842912A CN113429993A CN 113429993 A CN113429993 A CN 113429993A CN 202110842912 A CN202110842912 A CN 202110842912A CN 113429993 A CN113429993 A CN 113429993A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G1/00—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal
- C10G1/002—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal in combination with oil conversion- or refining processes
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G1/00—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal
- C10G1/02—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal by distillation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
Abstract
The invention provides a continuous hydrothermal liquefaction system and a continuous hydrothermal liquefaction method.A feeding system comprises a nitrogen tank and a raw material storage tank, wherein a high-frequency heating device is arranged around the raw material storage tank, and the nitrogen tank and the raw material storage tank are connected with each other; a flowmeter is arranged on an outlet pipeline of the raw material storage tank; the outlet end of the flowmeter is connected with a back pressure valve; the preheating system and the reaction system comprise a reactor; a filtration system comprising a filter and a filter panel, the filter panel disposed within the filter; and a collection system. The invention uses high-pressure nitrogen to convey the raw materials, and has low energy consumption; the raw materials are heated, so that the viscosity of the raw materials is reduced, and the pumpability is increased; the deposition and blockage of particles in the reactor are prevented by using the tubular auger blade; the rotation of the filter plate inside the filter ensures that solid-phase products are not easy to accumulate and adhere, and reduces the possibility of blockage.
Description
Technical Field
The invention relates to the technical field of biomass utilization, in particular to a continuous hydrothermal liquefaction system and a continuous hydrothermal liquefaction method.
Background
The hydrothermal liquefaction technology is a process for converting biomass such as microalgae, municipal sludge or straws and the like into bio-oil by using a thermochemical method and taking water or an organic solution as a solvent under the conditions of 250-400 ℃ and 7-23 MPa. The hydrothermal liquefaction technology has the characteristics of good raw material adaptability, high conversion efficiency and low cost, is a biomass oil-making technology with development prospect, and has a plurality of advantages compared with the traditional thermochemical method. For example, the hydrothermal liquefaction technology can directly utilize the raw material with high water content to carry out the reaction, thereby reducing the energy consumption required by drying the raw material; the fat in the biomass can be converted into the bio-oil, and cellulose, lignin, hemicellulose, protein and saccharides can be converted into the bio-oil. The technology has important significance for relieving energy crisis and improving the utilization rate of biomass energy.
In recent years, most of domestic and foreign researches on hydrothermal liquefaction are mainly conducted by intermittent experimental devices, and the research is far away from commercial application, so that the development of a continuous hydrothermal liquefaction system and a continuous hydrothermal liquefaction method are of great significance for realizing continuous industrial production. However, the continuous hydrothermal liquefaction system has the problems of high-pressure continuous pumping feeding, continuous product separation, complex process, high cost and the like. Currently, feed pumping systems pump different types of biomass feedstock primarily through hydraulic cylinders, diaphragm pumps, plunger pumps, or liquid chromatography pumps, but it is difficult to maintain high pressures and ensure uniformity of the biomass slurry entering the reactor. In addition, three-phase products (liquid phase, solid phase and gas phase) after hydrothermal liquefaction are separated efficiently and stably, material blockage is prevented, continuous operation of equipment is guaranteed, and the method has important significance for forming large-scale production.
Therefore, there is a need in the art for an apparatus and a technical solution thereof that can achieve continuous hydrothermal liquefaction.
Disclosure of Invention
The invention provides a continuous hydrothermal liquefaction system and a method.
In order to solve the above technical problems, the present invention provides the following technical solutions.
A continuous hydrothermal liquefaction system comprising:
the feeding system comprises a nitrogen tank and a raw material storage tank, wherein a high-frequency heating device is arranged around the raw material storage tank, and the nitrogen tank and the raw material storage tank are connected with each other; a flowmeter is arranged on an outlet pipeline of the raw material storage tank;
the preheating system comprises a heat exchanger; the heat exchanger is connected with the flowmeter;
the reaction system comprises a reactor, the front end of the reactor is connected with the heat exchanger, the rear end of the reactor is provided with a blasting valve, the reactor comprises a plurality of straight pipes, two adjacent straight pipes are connected through a bent pipe, and a high-frequency heating device is arranged around the reactor;
the filtering system comprises a filter and a filtering plate, the filtering plate is arranged inside the filter, and the filter is connected with the heat exchanger;
the collecting system comprises a pressure reduction pipeline, a cooler, a gravity separator, a gas phase collecting device and a liquid phase collecting device, wherein an inlet of the pressure reduction pipeline is connected with the filter, an outlet of the pressure reduction pipeline is connected with the cooler, the cooler is also connected with the gravity separator, the upper end of the gravity separator is connected with the gas phase collecting device, and the lower end of the gravity separator is connected with the liquid phase collecting device;
the gas phase collecting device comprises an exhaust pipeline and a gas collecting device, one end of the exhaust pipeline is connected with the gravity separator, the other end of the exhaust pipeline is connected with the gas collecting device, and a back pressure valve is arranged on the exhaust pipeline;
the liquid phase collecting device comprises a hydraulic cylinder and a hydraulic machine, and the hydraulic cylinder is respectively connected with the gravity separator and the hydraulic machine.
A first pressure-temperature sensor is arranged between the raw material storage tank and the flowmeter. A second pressure-temperature sensor is arranged between the heat exchanger and the reactor.
The filter plate is rotatable about a center.
And each straight pipe and each bent pipe are internally provided with a pressure sensor and a temperature sensor.
Each straight tube is internally provided with a flood dragon blade.
The filter comprises the first filter and the second filter, the first filter plate is arranged inside the first filter, and the second filter plate is arranged inside the second filter. The tail ends of the first filter and the second filter are connected through a connecting pipeline, a control valve is arranged on the connecting pipeline, and the connecting pipeline is further connected with a collecting system.
The flowmeter is a gear flowmeter, and the reactor is a plug-flow reactor.
The invention also provides the following technical scheme.
A continuous hydrothermal liquefaction process comprising the steps of:
s1, checking the air tightness of the system, running a water test, and setting a threshold value of a blasting valve to ensure that the system runs stably under the set temperature and pressure conditions;
s2, after the system is stable, opening a valve, conveying the raw material into a pipeline through a nitrogen tank in a pressurized manner, heating the raw material to a preset preheating temperature through a heat exchanger, and monitoring the temperature of the preheated raw material and the pressure in the pipeline through a temperature sensor and a pressure sensor between the heat exchanger and a reactor;
s3, enabling the raw materials to enter a reactor through a pipeline after heat exchange, starting hydrothermal liquefaction reaction, and monitoring the temperature and pressure of the reactor in real time by using a temperature sensor and a pressure sensor in each straight pipe and each bent pipe in the reactor;
s4, cooling the reacted product through a heat exchanger through a pipeline, conveying the product to a filter for product separation, wherein the solid-phase product cannot pass through a filter plate and stays in the filter, the non-solid-phase product passes through the filter plate and a valve and slowly passes through a pressure reduction pipeline to achieve the pressure reduction effect, cooling the product by taking water as a coolant, and conveying the cooled product to a gravity separator for gas-liquid separation; and finally, using a hydraulic press pressure regulating valve to regulate the pressure to collect the liquid-phase product, and connecting the gas phase to a gas collection device through a valve to collect the gas.
When a decrease in reactor pressure is detected, the reactor pressure can be raised and stabilized by adjusting the hydraulic press.
The reaction temperature in the reactor is 300-400 ℃, and the pressure is 20-30 MPa.
The threshold value of the explosion valve is 35MPa, and the preheating set temperature is 200 ℃.
Compared with the prior art, the invention has the beneficial effects that: high-pressure nitrogen is used for conveying raw materials, so that the energy consumption is low; the raw materials are heated, so that the viscosity of the raw materials is reduced, and the pumpability is increased; the deposition and blockage of particles in the reactor are prevented by using the tubular auger blade; the rotation of the filter plate inside the filter ensures that solid-phase products are not easy to accumulate and adhere, and reduces the possibility of blockage.
Drawings
FIG. 1 is a schematic of the present invention.
Fig. 2 is a schematic diagram of another embodiment of the present invention.
The reference signs are: 1-nitrogen tank, 2-raw material storage tank, 3-high frequency heating device, 4-flowmeter, 5-heat exchanger, 6-reactor, 7-straight pipe, 8-elbow pipe, 9-explosion valve, 10-filter, 101-first filter, 102-second filter, 11-filter plate, 111-first filter plate, 112-second filter plate, 12-exhaust pipe, 13-back pressure valve, 14-gas phase collecting device, 15-liquid phase collecting device, 16-pressure reducing pipe, 17-hydraulic cylinder, 18-gravity separator, 19-cooler, 20-slag storage chamber, 201-first slag storage chamber, 202-second slag storage chamber, 21-first temperature-pressure sensor, 22-hydraulic press, 23-gas collecting equipment, 24-second temperature-pressure sensor.
Detailed Description
The technical solutions of the present invention are described in detail below with reference to examples in order to make those skilled in the art better understand the technical features, objects, and advantages of the present invention, but should not be construed as limiting the implementable scope of the present invention.
A continuous hydrothermal liquefaction system as shown in fig. 1-2, comprising: the system comprises a feeding system, a preheating system, a reaction system, a filtering system and a collecting system.
The feeding system comprises a nitrogen tank 1 and a raw material storage tank 2, in the embodiment, two raw material storage tanks 2 arranged in parallel are adopted, the two raw material storage tanks 2 alternately operate to ensure the continuous output of raw materials, a high-frequency heating device 3 is arranged around the raw material storage tank 2, and the nitrogen tank 1 and the raw material storage tank 2 are connected with each other; in this embodiment, three temperature sensors and three pressure sensors are provided in each raw material tank 2.
A flowmeter 4 is arranged on an outlet pipeline of the raw material storage tank 2; the outlet end of the flow meter 4 is connected with a heat exchanger 5; the sludge is added into the raw material storage tank 2, the high-frequency heating device 3 is used for heating the sludge in the raw material storage tank 2, and the sludge belongs to non-Newtonian fluid, so that the viscosity of the sludge is reduced due to the temperature rise, and the sludge is easier to pump, therefore, the sludge is heated to 80 ℃ in the system of the embodiment, and the sludge is in a fluid state after the viscosity is reduced and is conveyed under pressure. All be provided with the reducing about raw materials storage tank 2, go up the reducing and prevent that nitrogen gas from directly impacting mud, make nitrogen gas steady pressurize mud, with mud pressurization conveying inlet line, slowly open nitrogen gas jar 1 valve, prevent that the too big mud fluid characteristic of impulse pressure from causing the influence. The lower reducing diameter prevents the high-pressure nitrogen from directly entering the pipeline through the sludge when the sludge amount is small. The pressure comes from the nitrogen tank 1, and different from other types of feeding modes, the nitrogen pressurization performance is more stable and the cost is lower compared with that of a high-pressure pump, so that the nitrogen pressurization mode is cleaner and more environment-friendly. A valve is arranged between the raw material storage tank 2 and the flow meter 4, and a first pressure-temperature sensor 21.
The preheating system comprises a heat exchanger 5; the reaction system includes a reactor 6.
A second pressure-temperature sensor 24 is arranged between the heat exchanger 5 and the reactor 6, so that the pressure of sludge entering the pipeline and the temperature of the sludge can be monitored in real time, and the flow meter 4 monitors the flow in the pipeline. The flow meter 4 is a gear flow meter. The preheating temperature is monitored in real time and timely regulated, so that hydrothermal liquefaction reaction caused by overhigh preheating temperature in a preheating system is prevented, and the pressure sensor monitors the pressure after preheating and ensures the stability of the pressure entering the reaction system.
The product flowing out of the reactor 6 flows back into the heat exchanger 5, the raw material is heated by the heat of the liquefied product, the raw material in the heat exchanger 5 is heated and then enters the reactor 6, and the liquefied product enters the filter after heat exchange.
In this example, the reactor 6 is a plug flow reactor. The front end of the reactor 6 is connected with the heat exchanger 5, the packing auger blade is arranged in the reactor 6 and comprises a plurality of straight pipes 7, in the embodiment, the packing auger blade is arranged in the straight pipes 7, and two adjacent straight pipes 7 are connected through a bent pipe 8. The straight pipes 7 have uniform heating areas, the inner auger blades can prevent the sedimentation of particles, and temperature and pressure sensors are arranged in each straight pipe 7 and each bent pipe 8 to monitor the temperature and the pressure in the reactor at any time so as to ensure that the sludge is fully reacted in the reactor. In this embodiment, three temperature sensors and three pressure sensors are disposed in each straight pipe 7, and one temperature sensor and one pressure sensor are disposed in each bent pipe 8. The high-frequency heating apparatus 3 is provided around the reactor 6. The back end of the reactor 6 is provided with a burst valve 9 to prevent the explosion danger caused by the rapid rise of pressure due to temperature rise.
The filtering system is shown in fig. 1, and comprises a filter 10 and a filter plate 11, wherein the filter plate 11 is arranged inside the filter 10, and the front end of the filter 10 is connected with the heat exchanger 5. A temperature sensor and a pressure sensor are provided between the heat exchanger 5 and the filter 10.
The products are in the solid, liquid and gas phases. The liquid phase comprises an aqueous phase and an oil phase.
The filter 10 adopts gravity sedimentation, the non-solid phase product flows out from the upper part of the device through the filter plate 11, the solid phase product is settled in the filter 10 by gravity, and the solid phase can be collected by the slag storage chamber 20. The filter 11 shape is circular, can rotate around the center, prevents that solid phase from piling up and causing the non-solid phase liquefaction product can't be collected through filter 11 smoothly. The liquid and gaseous phases enter a collection system.
As shown in fig. 2, in another embodiment of the present invention, two sets of filters 10 arranged in parallel are adopted, and the two sets of filters 10 are used alternately, specifically: the filter 10 includes a first filter 101 and a second filter 102, a first filter plate 111 is disposed inside the first filter 101, and a second filter plate 112 is disposed inside the second filter 102. The ends of the first filter 101 and the second filter 102 are connected by a connecting pipe, a control valve is arranged on the connecting pipe, and the connecting pipe is also connected with a collecting system.
The collecting system comprises a pressure reduction pipeline 16, a cooler 19, a gravity separator 18, a gas phase collecting device 14 and a liquid phase collecting device 15, wherein an inlet of the pressure reduction pipeline 16 is connected with the filter 10, an outlet of the pressure reduction pipeline 16 is connected with the cooler 19, the cooler 19 is also connected with the gravity separator 18, the upper end of the gravity separator 18 is connected with the gas phase collecting device 14, and the lower end of the gravity separator 18 is connected with the liquid phase collecting device 15; a temperature sensor and a pressure sensor are provided at the inlet of the depressurization line 16 for monitoring the pressure and temperature of the non-solid phase liquefied product entering the depressurization line 16. A temperature sensor and a pressure sensor are arranged at the outlet of the cooler 19 and used for monitoring the pressure and the temperature of the non-solid phase liquefied product after being cooled and depressurized.
The non-solid phase liquefaction product that flows from filtration system steps down earlier, total multiunit parallel connection's pressure reduction pipeline 16, and each pressure reduction pipeline 16 of group is the pipeline series connection constitution of several cylinder shape, and the interface bore between two adjacent pipelines in front and back is less, and pressure can not take place to descend rapidly, can not lead to the fact great influence to the pressure in the reaction system to realize slowly stepping down. Then cooled by a cooler 19 and finally subjected to gas-liquid separation in a gravity separator 18.
The gas phase product separated by the gravity separator 18 enters the gas phase collecting device 14. The gas phase product passes through the exhaust pipeline 12, and when the pressure is greater than the pressure set by the backpressure valve 13, the gas can pass through the backpressure valve 13, so that the pressure of the reaction system is stable, and finally the gas phase product is collected to the gas collection device 23.
The liquid phase product separated by the gravity separator 18 enters the liquid phase collecting device 15. The liquid phase product separated from the gravity separator 18 is collected by two hydraulic cylinders 17 arranged in parallel under the action of a hydraulic press 22.
The gas phase collecting device 14 comprises an exhaust pipeline 12 and a gas collecting device 23, one end of the exhaust pipeline 12 is connected with the gravity separator 18, the other end of the exhaust pipeline 12 is connected with the gas collecting device 23, and the exhaust pipeline 12 is provided with a back pressure valve 13; in this embodiment, the gas collecting device 23 is a gas collecting bottle.
The liquid phase collecting device 15 comprises a hydraulic cylinder 17 and a hydraulic machine 22, and the hydraulic cylinder 17 is respectively connected with the gravity separator 18 and the hydraulic machine 22. In this embodiment, the liquid phase collecting device 15 includes two hydraulic cylinders 17 arranged in parallel.
The high temperature reaction process in the reaction system may have a large influence on the set pressure condition, and in order to stabilize the pressure in the whole process, the pressure change caused by the reaction or the temperature reduction needs to be regulated, and the pressure of the reaction system can be maintained stable while the collection process is ensured to be continuous by adjusting the hydraulic machine 22.
The method for carrying out continuous hydrothermal liquefaction by adopting the device comprises the following steps:
s1, checking the air tightness of the continuous hydrothermal liquefaction system, introducing water for trial operation, and setting a threshold value of the explosion valve 9 to ensure that the continuous hydrothermal liquefaction system operates stably under the set temperature and pressure conditions;
s2, after the continuous hydrothermal liquefaction system is stabilized, opening a valve, conveying the raw material into a pipeline through a nitrogen tank 1 in a pressurized manner, heating the raw material to a preset preheating temperature through a heat exchanger 5, and monitoring the temperature of the preheated raw material and the pressure in the pipeline through a temperature sensor and a pressure sensor between the heat exchanger 5 and a reactor 6;
s3, the raw materials enter the reactor 6 through a pipeline after heat exchange, hydrothermal liquefaction reaction is started, and the temperature and pressure of the reactor 6 are monitored in real time by temperature sensors and pressure sensors in each straight pipe 7 and each bent pipe 8 in the reactor 6;
s4, cooling the reacted product by flowing through a heat exchanger 5 through a pipeline, conveying the product to a filter 10 for product separation, wherein the solid-phase product cannot pass through a filter plate 11 and stays in the filter 10, the non-solid-phase product passes through the filter plate and a valve and slowly passes through a pressure reduction pipeline 16 to achieve the pressure reduction effect, cooling the product by taking water as a coolant, and conveying the cooled product to a gravity separator 18 for gas-liquid separation; and finally, collecting the liquid-phase product by using a hydraulic press pressure regulating valve to regulate the pressure, and connecting the gas phase to a gas collecting device 23 through a valve to collect the gas.
In this embodiment, the reaction temperature in the reactor 6 is 300-400 ℃ and the pressure is 20-30 MPa. The threshold value of the explosion valve 9 is 35MPa, and the preheating setting temperature is 200 ℃.
The above is only a preferred embodiment of the present invention, but the present invention is not limited to the above-mentioned specific embodiments, and those skilled in the art can make several variations and modifications without departing from the inventive concept of the present invention, which fall into the protection scope of the present invention.
Claims (10)
1. A continuous hydrothermal liquefaction system, comprising:
the feeding system comprises a nitrogen tank (1) and a raw material storage tank (2), wherein a high-frequency heating device (3) is arranged around the raw material storage tank (2), and the nitrogen tank (1) and the raw material storage tank (2) are connected with each other; a flow meter (4) is arranged on an outlet pipeline of the raw material storage tank (2);
a preheating system comprising a heat exchanger (5); the heat exchanger (5) is connected with the flowmeter (4);
the reaction system comprises a reactor (6), the front end of the reactor (6) is connected with the heat exchanger (5), the rear end of the reactor (6) is provided with a blasting valve (9), the reactor (6) comprises a plurality of straight pipes (7), two adjacent straight pipes (7) are connected through a bent pipe (8), and a high-frequency heating device (3) is arranged around the reactor (6);
the filtering system comprises a filter (10) and a filtering plate (11), wherein the filtering plate (11) is arranged inside the filter (10), and the filter (10) is connected with the heat exchanger (5);
the collecting system comprises a pressure reduction pipeline (16), a cooler (19), a gravity separator (18), a gas phase collecting device (14) and a liquid phase collecting device (15), wherein the inlet of the pressure reduction pipeline (16) is connected with the filter (10), the outlet of the pressure reduction pipeline (16) is connected with the cooler (19), the cooler (19) is also connected with the gravity separator (18), the upper end of the gravity separator (18) is connected with the gas phase collecting device (14), and the lower end of the gravity separator (18) is connected with the liquid phase collecting device (15);
the gas phase collecting device (14) comprises an exhaust pipeline (12) and a gas collecting device (23), one end of the exhaust pipeline (12) is connected with the gravity separator (18), the other end of the exhaust pipeline (12) is connected with the gas collecting device (23), and a back pressure valve (13) is arranged on the exhaust pipeline (12);
the liquid phase collecting device (15) comprises a hydraulic cylinder (17) and a hydraulic machine (22), and the hydraulic cylinder (17) is connected with the gravity separator (18) and the hydraulic machine (22) respectively.
2. The continuous hydrothermal liquefaction system of claim 1, characterized in that a first pressure-temperature sensor (21) is provided between the raw material storage tank (2) and the flow meter (4), and a second pressure-temperature sensor (24) is provided between the heat exchanger (5) and the reactor (6).
3. The continuous hydrothermal liquefaction system of claim 1, characterized in that the filter plate (11) is rotatable about a center.
4. The continuous hydrothermal liquefaction system of claim 1, characterized in that a pressure sensor and a temperature sensor are provided in each of the straight pipes (7) and each of the bent pipes (8).
5. The continuous hydrothermal liquefaction system of claim 1, characterized in that a flood dragon blade is provided in each straight tube (7).
6. The continuous hydrothermal liquefaction system of claim 1, characterized in that the filter (10) comprises the first filter (101) and the second filter (102), the first filter plate (111) is arranged inside the first filter (101), the second filter plate (112) is arranged inside the second filter (102), the ends of the first filter (101) and the second filter (102) are connected by a connecting line, on which a control valve is arranged, and the connecting line is further connected to a collection system.
7. The continuous hydrothermal liquefaction system of claim 1, characterized in that the flow meter (4) is a gear flow meter and the reactor (6) is a plug flow reactor.
8. A continuous hydrothermal liquefaction method is characterized by comprising the following steps:
s1, checking the air tightness of the continuous hydrothermal liquefaction system, introducing water for trial operation, and setting a threshold value of a blasting valve (9) to ensure that the continuous hydrothermal liquefaction system operates stably under the set temperature and pressure conditions;
s2, after the continuous hydrothermal liquefaction system is stabilized, opening a valve, conveying the raw materials into a pipeline in a pressurizing manner through a nitrogen tank (1), heating the raw materials to a preheating set temperature through a heat exchanger (5), and monitoring the temperature of the preheated raw materials and the pressure in the pipeline through a temperature sensor and a pressure sensor between the heat exchanger (5) and a reactor (6);
s3, enabling the raw materials to enter a reactor (6) through a pipeline after heat exchange, starting hydrothermal liquefaction reaction, and monitoring the temperature and pressure of the reactor (6) in real time by temperature sensors and pressure sensors in each straight pipe (7) and each bent pipe (8) in the reactor (6);
s4, cooling the reacted product by flowing through a heat exchanger (5) through a pipeline, conveying the product to a filter (10) for product separation, wherein the solid-phase product cannot pass through a filter plate (11) and stays in the filter (10), the non-solid-phase product passes through the filter plate (11) and a valve and slowly passes through a pressure reduction pipeline (16) to achieve the pressure reduction effect, then cooling the product by taking water as a coolant, and conveying the cooled product to a gravity separator (18) for gas-liquid separation; and finally, a hydraulic press pressure regulating valve is used for regulating the pressure to collect the liquid-phase product, and the gas phase is connected to a gas collection device (23) through a valve to collect the gas.
9. The continuous hydrothermal liquefaction process of claim 8, characterized in that the reaction temperature in the reactor (6) is 300-400 ℃ and the pressure is 20-30 MPa.
10. The continuous hydrothermal liquefaction process according to claim 8, characterized in that the threshold value of the burst valve (9) is 35MPa and the pre-heating set temperature is 200 ℃.
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