CN111234888B - Supercritical water reaction product and wet biomass cooperative recycling system and method - Google Patents
Supercritical water reaction product and wet biomass cooperative recycling system and method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/02—Liquid carbonaceous fuels essentially based on components consisting of carbon, hydrogen, and oxygen only
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M21/00—Bioreactors or fermenters specially adapted for specific uses
- C12M21/02—Photobioreactors
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
- C12N1/12—Unicellular algae; Culture media therefor
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
- C12N1/20—Bacteria; Culture media therefor
Abstract
A system for supercritical water reaction product co-wet biomass recycling, comprising: the supercritical water reaction product separation system is used for carrying out gas-liquid separation on supercritical water reaction products; the wet biomass separation and recovery system is used for carrying out solid-oil-water three-phase separation of the wet biomass; microalgae cultivation and concentration system, water phase obtained by supercritical water reaction product separation system and wet biomass separation and recovery system and CO obtained by supercritical water reaction product separation system 2 Carrying out microalgae photo-biological reaction to culture microalgae, and connecting an algae slurry outlet with a concentrating device for concentration; the hydrothermal liquefaction oil production system utilizes concentrated algae slurry of a concentrating device and oil phase obtained by a wet biomass separation and recovery system to carry out hydrothermal liquefaction oil production. The invention also provides a corresponding microalgae culture and bio-oil comprehensive preparation method, and realizes the environment-friendly comprehensive resource utilization of wastewater, grease and gas in the process.
Description
Technical Field
The invention belongs to the technical field of waste reclamation and waste heat utilization, relates to environment-friendly comprehensive reclamation of heat, waste water, grease and gas in a wet biomass and supercritical water treatment process, and particularly relates to a system and a method for recycling wet biomass by utilizing supercritical water reaction products.
Background
The supercritical water treatment is a high-efficiency harmless treatment and resource utilization technology of high-concentration organic waste liquid, and is a process of rapidly converting organic macromolecules into water and hydrogen-rich combustible gas in an anaerobic or anoxic state or rapidly converting the organic macromolecules into pollution-free micromolecular compounds and inorganic salts in a peroxy condition by utilizing the characteristics of high diffusion coefficient, low viscosity, low dielectric constant and the like of supercritical water in water with temperature and pressure higher than the critical state.
The wet biomass is biomass with high water content, and comprises organic waste liquid, animal waste, water bloom blue algae, kitchen waste and the like. Taking kitchen waste as an example, the kitchen waste generally comprises grease, leftovers, vegetable leaves, fruit peel, eggshells and the like, the kitchen waste produced in China every year is not less than 6000 ten thousand tons, and the kitchen waste yield in large and medium cities is remarkable.
One major problem affecting the industrialization of supercritical water reactions is the economics of the process. Mainly embodied in the aspects of effective recovery and utilization of system energy and substances. The fluid after the reaction is generally maintained at a higher temperature (> 500 ℃) and the energy is needed to be fully utilized in the follow-up process to ensure the economical efficiency of the treatment system. Meanwhile, during the treatment, the organic matters fully react to generate a large amount of carbon dioxide. If not utilized, direct emissions can cause greenhouse effect. Meanwhile, the traditional wet biomass treatment method, such as kitchen waste, is mainly used for mixing and stacking with household garbage at present, and the traditional incineration and landfill are mainly used. The recycling of the resources such as grease and the like cannot be realized, and the environment is greatly harmed.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a system and a method for recycling the supercritical water reaction product and the wet biomass, which can efficiently utilize resources in the supercritical water reaction product to realize the recycling of the wet biomass in a coordinated manner, and realize the environment-friendly comprehensive recycling of wastewater, grease and gas in the process, thereby solving the difficult problems in the supercritical water reaction and the common wet biomass treatment process and having important engineering application value.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a system for supercritical water reaction product co-wet biomass recycling, comprising:
the supercritical water reaction product separation system is used for carrying out gas-liquid separation on supercritical water reaction products;
the wet biomass separation and recovery system is used for carrying out solid-oil-water three-phase separation of the wet biomass;
microalgae cultivation and concentration system, water phase obtained by supercritical water reaction product separation system and wet biomass separation and recovery system and CO obtained by supercritical water reaction product separation system 2 Carrying out microalgae photo-biological reaction to culture microalgae, and connecting an algae slurry outlet with a concentrating device for concentration;
the hydrothermal liquefaction oil production system utilizes concentrated algae slurry of a concentrating device and oil phase obtained by a wet biomass separation and recovery system to carry out hydrothermal liquefaction oil production.
The supercritical water reaction product separation system comprises a first heat exchanger, a hot fluid inlet of the first heat exchanger is connected with an outlet of the supercritical water reactor, a hot fluid outlet of the first heat exchanger is connected with an inlet of a back pressure device I, an outlet of the back pressure device I is connected with an inlet of a gas-liquid separator, a liquid outlet of the gas-liquid separator is connected with a water phase storage tank, and CO 2 The gas outlet is connected with the gas phase inlet of the microalgae culture and concentration system, and the outlet of the water phase storage tank is connected with the water phase inlet of the microalgae culture and concentration system.
The wet biomass separation and recovery system comprises a crusher, wherein an inlet of the crusher is connected with a wet biomass material outlet, an outlet of the crusher is connected with an inlet of a solid-oil-water separator, a solid-phase outlet of the solid-oil-water separator is connected with an inlet of carbonization equipment, and an aqueous phase outlet is connected with an inlet of the aqueous phase storage tank.
The microalgae cultivation and concentration system comprises a microalgae photobioreactor, wherein the water phase inlet of the microalgae photobioreactor is connected with the outlet of the water phase storage tank, and the gas phase inlet is connected with the CO 2 The gas outlet is connected with the inlet of the concentration device, and the water phase outlet of the concentration device is connected with the inlet of the water phase storage tank in a back way.
The hydrothermal liquefaction oil production system comprises a heat exchanger II, a hot fluid inlet of the heat exchanger II is connected with a concentrated algae slurry outlet of the concentrating device and an oil phase outlet of the solid-oil separator through a high-pressure pump, a hot fluid outlet of the heat exchanger II is connected with an inlet of a hydrothermal liquefaction reactor, an outlet of the hydrothermal liquefaction reactor is connected with a hot fluid inlet of a heat exchanger III, a hot fluid outlet of the heat exchanger III is connected with an inlet of a back pressure device II, an outlet of the back pressure device II is connected with an inlet of an oil-water-gas-solid separator, an oil phase outlet of the oil-water-solid separator outputs biological crude oil, a gas phase outlet is connected with a gas phase inlet of the microalgae photobioreactor, a water phase outlet is connected with an inlet of a water phase storage tank in a back way, and a solid phase outlet is connected with an inlet of the carbonization equipment.
The cooling water inlet of the first heat exchanger is connected with the cooling water outlet of the second heat exchanger, and the cooling water outlet of the first heat exchanger is connected with the cooling water inlet of the second heat exchanger.
And the cooling water inlet of the heat exchanger III is connected with the cooling water outlet of the carbonization device, and the cooling water outlet of the heat exchanger III is connected with the cooling water inlet of the carbonization device.
According to the invention, the first heat exchanger and the second heat exchanger are arranged, and cooling water is adopted to recycle the abundant heat of the high-temperature fluid at the outlet of the supercritical water reactor through heat exchange, and the heat exchange device is used for the preheating process of the concentrated algae slurry hydrothermal liquefaction reaction. And the heat exchanger III is arranged to recover the surplus heat after the hydrothermal reaction and is used for the dry distillation process of the solid residue in the system.
H produced by supercritical water reaction of the invention 2 The combustible gas can be recovered by a high-pressure gas separator. CO separated after supercritical water fluid depressurization through gas-liquid separation and hydrothermal liquefaction reaction 2 The recovered waste water is utilized in a microalgae photobioreactor.
The water after supercritical water reaction, microalgae concentrated leachate and water separated from products after microalgae hydrothermal reaction are recycled and reused as a water source in a microalgae photobioreactor.
The wet biomass is crushed, and the grease separated by the oil-water-solid separator is mixed with concentrated algae slurry after being recovered, so as to improve the oil yield of the hydrothermal oil production reaction.
According to the invention, after wet biomass is separated, the residual solid phase residue and the solid phase residue after the microalgae hydrothermal reaction fluid are separated are collected and subjected to carbonization, so that the biochar is prepared, and the recycling utilization of the biochar is realized.
The invention also provides a method for realizing the recycling of supercritical water reaction products and wet biomass, which comprises the following steps:
1) The supercritical water reaction product is high-temperature fluid with the temperature of more than or equal to 500 ℃, and the high-temperature fluid is separated into hydrogen-rich combustible gas in a high-pressure gas separator and then enters a gas-liquid separator to separate CO 2 The part of CO 2 Recovering and using the carbon source as a carbon source required in the growth of microalgae in the microalgae cultivation process; the organic matter content in the water phase product is greatly reduced, COD is less than or equal to 1000mg/L, the water phase product has no biotoxicity, and the water phase is recycled as a culture water body in the microalgae cultivation process after being recycled;
2) Crushing wet biomass, and then carrying out solid-oil-water separation in a solid-oil-water three-phase separator; wherein the water phase is rich in protein and organic matters, and is recycled, and then is utilized in the microalgae cultivation process, and the solid phase residue is dehydrated, dried and dry distilled to prepare the biochar;
3) The microalgae cultivation process is carried out in a microalgae photobioreactor, the microalgae cultivation process is carried out after maturation, the microalgae cultivation process is collected and concentrated in a concentrating device, the liquid rich containing N, P element is leached out, the microalgae is recycled in the microalgae photobioreactor after being prepared, the grease obtained by separating the concentrated algae slurry and wet biomass is mixed and preheated to 250-370 ℃ and then enters a hydrothermal liquefying reactor, the product fluid is the mixed product of oil, water, solid phase and a small amount of gas, the biological oil is obtained after separation, the solid phase product is carbonized to prepare biochar, and the gas product is rich in CO 2 And (3) recycling the waste water as a carbon source for microalgae growth, returning the waste water to the photobioreactor for recycling, and returning the water phase to the photobioreactor for recycling.
The surplus heat of the fluid is recovered through the first heat exchanger and is utilized in the preheating process of the microalgae hydrothermal liquefaction oil production process, and the grease obtained by separating the concentrated algae slurry from the wet biomass is preheated to 250-370 ℃ through the second heat exchanger.
In the process, the cooling water realizes circulation without supplementing an additional cooling water source.
Compared with the prior art, the invention has the beneficial effects that:
by reversing supercritical waterShould, hydrothermal liquefaction and wet living beings high value utilization technique combine together, furthest returns system heat, CO that produces 2 The oil and water resources and nutrient elements in the wet biomass such as solid phase residues, kitchen wastes and the like are utilized in a high value by preparing the biological oil through microalgae hydrothermal liquefaction. The process has no secondary pollution and obvious social and economic benefits.
Drawings
FIG. 1 is a schematic diagram of the system architecture of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and specific examples. The examples are only for illustrating the present invention and do not limit the scope of the present disclosure.
The invention is mainly based on the following principle:
in supercritical water reaction, because water is used as a reaction medium, a large amount of water can be effectively recycled and utilized in the process, so that water resources can be greatly saved.
The wet biomass, especially kitchen waste, is basically free of heavy metals, is rich in organic matters and has high biochar content. The collected kitchen waste can be subjected to preliminary sundry removal, and organic matter dry residue and oil-water mixture can be obtained by means of centrifugation, separation and the like. The organic dry slag can be used for preparing biochar. After the oil-water mixture is separated again, the grease can be used for producing biodiesel, and finally the remaining water contains rich organic matters, nitrogen and phosphorus and other substances besides higher concentration salt, and can be used for microalgae culture, carbon dioxide fixation and biological crude oil preparation.
The microalgae has the advantages of high photosynthesis efficiency, strong carbon fixation capacity, short cultivation period, small occupied area, no land competition with grain and the like, so that the microalgae is regarded as a third-generation biofuel raw material with great potential, the unit oil yield of the microalgae is hundreds of times that of corn, and 1.5 to 8 kiloliters of biodiesel can be produced per hectare. The microalgae is used for preparing the biological oil, so that excessive dependence on petroleum and coal can be reduced, carbon dioxide can be absorbed and fixed, greenhouse effect is reduced, and the method has remarkable environmental benefit. The microalgae is prepared into biological oil by adopting a hydrothermal liquefaction technology, and compared with the traditional technology, the method has the characteristics of high oil yield, good oil quality and the like. Meanwhile, the oil-water mixture after hydrothermal liquefaction is separated, and the water phase product is rich in nutrient elements necessary for the growth process of microalgae, can be recycled, and has remarkable economical efficiency.
Based on the above, as shown in fig. 1, the invention combines supercritical water reaction technology, wet biomass separation and recovery, microalgae culture and hydrothermal liquefaction oil production technology, fully utilizes the technical advantages, and realizes water and CO 2 The nutrient substances, the grease and the solid phase residue are recycled. Taking kitchen waste as an example, the kitchen waste mainly comprises the following aspects:
1) After supercritical water reaction, the temperature of fluid is up to 500-600 ℃, waste heat is recovered through a first heat exchanger, the temperature of fluid is reduced to below 50 ℃, and then hydrogen-rich combustible gas is separated through a high-pressure gas separator. Then the mixture is cooled to normal pressure by a back pressure device, and water phase and carbon dioxide are separated. Separated CO 2 And the microalgae is fed into the microalgae culture photobioreactor through a gas distribution system, so as to provide a carbon source for the growth of the microalgae. The liquid phase is mainly water and some organic compounds which are not completely reacted, soluble nitrate, phosphate and the like, and is mixed with insoluble inorganic salt solid particles such as coke, silicate and the like, and COD of the solid particles is obtained<1000mg/L can be used as microalgae culture water body and enters into a water phase storage tank.
2) The main components of the wet biomass kitchen waste may include lignocellulose, organic compounds, grain residues, grease, pericarp, bone, shell, food packaging and the like. The wet biomass is firstly crushed into particles below 1cm by a crusher, deodorized and then enters a solid-oil-water three-phase separator, and the water phase is rich in water-soluble proteins and amino acids, so that essential nutrient elements for microalgae growth can be provided, and the diluted solid biomass enters a water phase storage tank. The solid phase residue is prepared into biochar through dry distillation. The heat of the carbonization process is taken from the surplus heat recovered by the fluid after the hydrothermal reaction. The main component of the grease is triglyceride, and the recovered grease is mixed with concentrated algae pulp to improve the yield of biological oil.
3) Adding water and algae in water phase tankReactor, CO 2 The CO is controlled by uniformly entering the photoreactor through the gas supply system 2 The air supply concentration is 10 percent, and the air flow rate is controlled to be 0.25 to 1L/min. Regulating pH value of water body to 6-8, nitrogen concentration to 80-165 mg/L, nitrogen-phosphorus ratio to 6-9, controlling sulfate ion<0.35mmol/L phenol concentration<100mg/L, salinity of 25-30 g/L, potassium ion concentration of 0.8-1.2 g/L, calcium and magnesium ion concentration>30mg/L, the iron/phosphorus ratio was adjusted to 0.7. Regulating the water temperature to 20-30 DEG C
4) The microalgae is enriched and dehydrated to form concentrated algae slurry after being cultured, the filtrate contains necessary nutrient elements, and the concentrated algae slurry is recycled in the photobioreactor after being returned to the water phase storage tank. After the algae slurry and the recovered grease are fully and uniformly mixed, the materials are pressurized to 15-25 MPa by a high-pressure pump.
5) After the materials are pressurized, the materials are preheated to 250-370 ℃ through a second heat exchanger and enter a hydrothermal liquefaction reactor. And (3) flowing out of the reactor after 2-5min of reaction time, and cooling the reaction fluid to below 50 ℃ through a heat exchanger III, wherein the surplus heat of the fluid is used for the dry distillation process of the solid residue in the system. And the reaction fluid is cooled to normal pressure through a second back pressure device. The reaction fluid is in solid, oil and water three-phase state (containing a small amount of gas products) at normal temperature and normal pressure, and biological oil is obtained after separation. The water phase product is recycled and then enters a water phase storage tank for recycling in the microalgae cultivation process, the solid phase product is mixed with solid phase residues after being separated from wet biomass after being collected, and the biochar is prepared through the carbonization process.
6) All cooling water in the system is circulated into the system after heat exchange, and no additional cooling water source is introduced.
The above is only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited by this, and any modification made on the basis of the technical scheme according to the technical idea of the present invention is within the protection scope of the claims of the present invention.
Claims (9)
1. A system for the co-recycling of supercritical water reaction products in conjunction with wet biomass, comprising:
the supercritical water reaction product separation system is used for carrying out gas-liquid separation on supercritical water reaction products;
the wet biomass separation and recovery system is used for carrying out solid-oil-water three-phase separation of the wet biomass;
microalgae cultivation and concentration system, water phase obtained by supercritical water reaction product separation system and wet biomass separation and recovery system and CO obtained by supercritical water reaction product separation system 2 Carrying out microalgae photo-biological reaction to culture microalgae, and connecting an algae slurry outlet with a concentrating device for concentration;
the hydrothermal liquefaction oil production system utilizes the concentrated algae slurry of the concentrating device and the oil phase obtained by the wet biomass separation and recovery system to carry out hydrothermal liquefaction oil production;
the supercritical water reaction product separation system comprises a first heat exchanger, a first hot fluid inlet of the first heat exchanger is connected with an outlet of the supercritical water reactor, a first hot fluid outlet of the first heat exchanger is connected with an inlet of a back pressure device, an outlet of the first back pressure device is connected with an inlet of a gas-liquid separator, a liquid outlet of the gas-liquid separator is connected with a water phase storage tank, and CO 2 The gas outlet is connected with the gas phase inlet of the microalgae culture and concentration system, and the outlet of the water phase storage tank is connected with the water phase inlet of the microalgae culture and concentration system.
2. The system for recycling supercritical water reaction products together with wet biomass according to claim 1, wherein the wet biomass separation and recovery system comprises a crusher, an inlet of the crusher is connected with a wet biomass material outlet, an outlet of the crusher is connected with an inlet of a solid-oil-water separator, a solid-phase outlet of the solid-oil-water separator is connected with an inlet of a carbonization device, and an aqueous-phase outlet is connected with an inlet of the aqueous-phase storage tank.
3. The system for recycling supercritical water reaction products together with wet biomass according to claim 2, wherein the microalgae cultivation and concentration system comprises a microalgae photobioreactor, an aqueous phase inlet of the microalgae photobioreactor is connected with an outlet of the aqueous phase storage tank, and a gas phase inlet is connected with the CO 2 The gas outlet is connected with the inlet of the concentration device, and the water phase outlet of the concentration device is connected with the inlet of the water phase storage tank in a back way.
4. The system for recycling supercritical water reaction products together with wet biomass according to claim 3, wherein the hydrothermal liquefaction oil production system comprises a second heat exchanger, a hot fluid inlet of the second heat exchanger is connected with a concentrated algae slurry outlet of the concentrating device and an oil phase outlet of the solid-oil separator through a high-pressure pump, a hot fluid outlet of the second heat exchanger is connected with an inlet of the hydrothermal liquefaction reactor, an outlet of the hydrothermal liquefaction reactor is connected with a hot fluid inlet of a third heat exchanger, a hot fluid outlet of the third heat exchanger is connected with an inlet of a back pressure device, an outlet of the second back pressure device is connected with an inlet of an oil-water-solid separator, an oil phase outlet of the oil-water-solid separator outputs biological crude oil, a gas phase outlet of the microalgae photobioreactor is connected with a gas phase inlet of the microalgae photobioreactor, a water phase outlet of the microalgae oil phase outlet is connected with an inlet of the water phase storage tank in a back pressure device, and a solid phase outlet of the microalgae oil phase storage tank is connected with an inlet of the carbonization device.
5. The system for recycling supercritical water reaction products in combination with wet biomass according to claim 4, wherein the cooling water inlet of the first heat exchanger is connected with the cooling water outlet of the second heat exchanger, the cooling water outlet of the first heat exchanger is connected with the cooling water inlet of the second heat exchanger, the cooling water inlet of the third heat exchanger is connected with the cooling water outlet of the carbonization device, and the cooling water outlet of the third heat exchanger is connected with the cooling water inlet of the carbonization device.
6. The supercritical water reaction product and wet biomass recycling system according to claim 4 or 5, wherein the wet biomass is kitchen waste.
7. A method for achieving the recycling of supercritical water reaction products and wet biomass, comprising the steps of:
1) The supercritical water reaction product is high-temperature fluid with the temperature of more than or equal to 500 ℃, and the high-temperature fluid is separated into hydrogen-rich combustible gas and CO in a high-pressure gas separator and a gas-liquid separator respectively 2 The part of CO 2 Recovering and culturing microalgae as microalgae growthA desired carbon source; the organic matter content in the water phase product is greatly reduced, COD is less than or equal to 1000mg/L, the water phase product has no biotoxicity, and the water phase is recycled as a culture water body in the microalgae cultivation process after being recycled;
2) Crushing wet biomass, and then carrying out solid-oil-water separation in a solid-oil-water three-phase separator; wherein the water phase is rich in protein and organic matters, and is recycled, and then is utilized in the microalgae cultivation process, and the solid phase residue is dehydrated, dried and dry distilled to prepare the biochar;
3) The microalgae cultivation process is carried out in a microalgae photobioreactor, the microalgae cultivation process is carried out after maturation, the microalgae cultivation process is collected and concentrated in a concentrating device, the liquid rich containing N, P element is leached out, the microalgae is recycled in the microalgae photobioreactor after being prepared, the grease obtained by separating the concentrated algae slurry and wet biomass is mixed and preheated to 250-370 ℃ and then enters a hydrothermal liquefying reactor, the product fluid is the mixed product of oil, water, solid phase and a small amount of gas, the biological oil is obtained after separation, the solid phase product is carbonized to prepare biochar, and the gas product is rich in CO 2 And (3) recycling the waste water as a carbon source for microalgae growth, returning the waste water to the photobioreactor for recycling, and returning the water phase to the photobioreactor for recycling.
8. The method for realizing the recycling of supercritical water reaction products and wet biomass according to claim 7, wherein the method is characterized in that the fluid surplus heat is recovered through a first heat exchanger and is utilized in the preheating process of the microalgae hydrothermal liquefaction oil production process, and the grease obtained by separating the concentrated algae slurry from the wet biomass is preheated to 250-370 ℃ through a second heat exchanger.
9. The method for recycling supercritical water reaction products and wet biomass according to claim 7, wherein the cooling water is circulated in the process without supplementing an additional cooling water source.
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