CN111330525A - Lignocellulose biomass hydrothermal liquefaction device and system thereof - Google Patents

Abstract

The invention belongs to the technical field of green renewable energy sources for producing bio-oil, and particularly relates to equipment and a system for preparing bio-oil/chemicals by utilizing lignocellulose biomass. The lignocellulose biomass hydrothermal liquefaction device is mainly a reaction kettle. The cylindrical sieve hollow lining with the spiral baffle plates is arranged in the reaction kettle cavity, so that the turbulence degree can be improved when the biomass hydrothermal liquefaction occurs, on one hand, the material mixing is facilitated, on the other hand, the solid after the reaction is intercepted in the lining, the solid-liquid separation after the reaction is finished is facilitated, and the separation cost can be effectively reduced. The photovoltaic power generation system is used for replacing conventional power, so that the production cost can be effectively reduced. The device and the system have low requirements, simple operation, small occupied area, no secondary pollution and low investment and expense, and are beneficial to the efficient, clean, high-value utilization and popularization of biomass.

Description

Lignocellulose biomass hydrothermal liquefaction device and system thereof

Technical Field

The invention relates to the technical field of green renewable energy sources, in particular to a lignocellulose biomass hydrothermal liquefaction device and a lignocellulose biomass hydrothermal liquefaction system.

Background

Biomass is a carrier for storing solar energy and is also a recyclable organic carbon resource. The lignocellulose biomass comprises cellulose (35-50 wt%), hemicellulose (20-30 wt%) and lignin (20-30 wt%), accounts for more than 90 wt% of the plant biomass, and is the most main renewable carbon resource on the earth. China is a big agricultural country, the crop straw yield is about 9 hundred million tons every year, and the resource is rich and has wide development potential. But the straw is widely distributed, the utilization rate is not high, most of the straw is not reasonably utilized, so that the pollution to the atmosphere and water quality is caused, and the harm is huge. Meanwhile, currently available petroleum resources are increasingly exhausted, and many countries begin to find substitutes for petroleum. The hydrothermal liquefaction technology is a biomass 'Wet-thermochemical' conversion technology which is developed rapidly in recent years, and can realize the thermal cracking of macromolecules into micromolecule fragments under the action of a solvent under the relatively low reaction temperature (250-400 ℃), high pressure (5-30 MPa) and certain reaction time of biomass containing certain moisture. The hydrothermal liquefaction technology can convert lignocellulose biomass such as straws and the like into liquid fuel, and has important significance for relieving the current situation of shortage of liquid resources in China.

The biomass is converted into liquid fuel and high value-added energy chemicals by hydrothermal liquefaction (supercritical fluid), and is one of the leading edges of energy chemistry research. With the theoretical progress and technological innovation, a novel efficient reactor also becomes the focus of attention of current researchers. The reaction kettle is used as the most common equipment for providing a high-temperature and high-pressure reaction environment for preparing bio-oil/chemicals by biomass hydrothermal liquefaction, and the new processing and modification of the reaction kettle have extremely important significance for popularization and application of the lignocellulose biomass hydrothermal liquefaction industry. The hydrothermal liquefaction process requires high temperature and high pressure, so that the requirement on equipment is high, and the production cost of the equipment is increased. Therefore, the current preparation of bio-oil/chemical by hydrothermal liquefaction is mostly in the laboratory research stage and has less industrial application. Further research is needed on how to reduce the requirements on reaction equipment and conditions and realize industrial continuous production.

At present, the power sources for normal operation of reaction kettles on the market are conventional electric power, and the industry considers that bio-oil obtained by hydrothermal liquefaction of biomass is not discharged. The cost competitiveness of alternative energy is continuously improved, and the energy storage technology is more and more reasonable, so that the development of the industry can be effectively promoted by using conventional electric power and alternative energy as supplements, and even only using renewable energy as a power source. But the research on the aspect is only published at present.

The conversion of biomass into liquid fuels is widely available, such as fast pyrolysis liquefaction, high pressure liquefaction, hydrolytic fermentation, and the like. However, the process technologies have common problems, such as incomplete utilization of carbon resources in the conversion process, low product grade, difficulty in directly replacing the existing traffic fuel, complex purification of product components as chemicals, and high cost. The conversion of renewable biomass into hydrocarbon fuels as target products and high value-added chemicals by catalytic technology is the focus of attention, especially using solid heterogeneous catalysts. However, the solids (liquefied residues, solid catalysts) and liquids (bio-oil) are now generally present in the reactor as a mixture, which makes the separation costly.

The hydrothermal liquefaction and conversion of lignocellulose biomass into bio-oil/chemicals has great potential, but is limited by the problems of high energy consumption, difficult product separation and the like, and the biomass is still in a laboratory stage so far, so that the biomass-oil/chemical conversion method cannot be popularized and applied. In order to realize the industrial popularization and application of lignocellulose biomass energy and resource, a novel reaction kettle is developed and designed to facilitate solid-liquid separation, and a liquefaction system using renewable energy sources to replace conventional electric power is in urgent need at present.

Disclosure of Invention

The main objective of the present invention is to provide a lignocellulosic biomass hydrothermal liquefaction device and a system thereof, so as to solve the above mentioned technical problems.

As one aspect of the present invention, there is provided a lignocellulosic biomass hydrothermal liquefaction apparatus comprising:

the reaction kettle comprises a kettle body, and a reaction kettle cavity is formed in the kettle body;

the heating layer is arranged on the outer side of the kettle body, and heating oil and a resistance wire are arranged in the heating layer and used for heating a kettle cavity of the reaction kettle;

the lining is arranged in the reaction kettle cavity, and an interlayer is formed between the lining and the reaction kettle cavity; the inner liner is hollow, and a spiral baffle plate is arranged on the inner wall of the inner liner;

the magnetic stirrer comprises a stirring paddle and a magnetic driver, and the magnetic driver is arranged at the end part of the stirring paddle; the other end of the stirring paddle extends to the inner part of the lining;

the hydrothermal liquefaction reaction is carried out in the inner liner, the reacted solid is retained in the inner liner, and the reacted liquid can be discharged into the interlayer through the hollow part of the inner liner, so that solid-liquid separation is realized.

As another aspect of the present invention, there is also provided a lignocellulosic biomass hydrothermal liquefaction system comprising:

the lignocellulosic biomass hydrothermal liquefaction unit as described above;

and the photovoltaic power generation device is used for providing electric energy for the operation of the resistance wire of the heating layer and the magnetic stirrer.

Based on the technical scheme, compared with the prior art, the invention has at least one or part of the following beneficial effects:

the lignocellulose biomass hydrothermal liquefaction device is provided with a hollow lining, is used for placing solid raw materials, a solid heterogeneous catalyst and the like, can quickly realize solid-liquid separation after the reaction is finished, and effectively reduces the separation cost; the spiral baffle plate is arranged on the inner wall of the lining, so that the turbulence can be improved when the biomass is subjected to hydrothermal liquefaction, and the combination of the spiral baffle plate and the magnetic stirrer is favorable for material mixing;

the lignocellulose biomass hydrothermal liquefaction system can effectively reduce the production cost by replacing conventional electric power with the photovoltaic power generation device;

in conclusion, the lignocellulose biomass hydrothermal liquefaction device and the system thereof have the advantages of low requirement, simple operation, small occupied area, no secondary pollution and low investment and expense, and are beneficial to efficient, clean and high-value utilization and popularization of biomass.

Drawings

FIG. 1 is a schematic partial half-section view of a reaction vessel according to an embodiment of the present invention;

FIG. 2 is a schematic partial half-section view of a reaction vessel and liner according to an embodiment of the invention;

fig. 3 is a schematic diagram of a lignocellulosic biomass hydrothermal liquefaction system in accordance with an embodiment of the present invention;

fig. 4 is a schematic diagram of a laboratory separation process for preparing bio-oil/chemicals by hydrothermal liquefaction of lignocellulosic biomass according to an embodiment of the present invention.

In the above figures, the reference numerals have the following meanings:

1. a kettle body; 2. a first exhaust port; 3. a cooling water inlet; 4. a temperature sensor probe; 5. a pressure sensor probe; 6. a dielectric constant test probe; 7. an air inlet; 8. a cooling water outlet; 9. a second exhaust port; 10. a magnetic stirrer; 11. a nut; 12. a cooling water circulation line; 13. an air inlet pipe; 14. a liner; 15. a magnetic actuator housing; 16. an internal thread; 17. a stirring paddle; 18. a helical baffle plate; 19. a flange plate; 20. a flange cover; 21. a stud; 22. an interlayer; 23. a magnetic stirrer mounting port; 24. a storage battery; 25. a gas collection tank; 26. a solid-liquid separator; 27. a heating circulator; 28. a solids storage tank; 29. a distillation kettle; 30. a peristaltic pump; 31. a distillation condenser; 32. a liquid collection tank; 33. a solar panel; 34. a solar controller; 35. an AC-DC inverter.

Detailed Description

In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.

As shown in fig. 1 and 2, a lignocellulosic biomass hydrothermal liquefaction apparatus includes: a reaction kettle, a heating layer, an inner liner 14 and a magnetic stirrer 10; the reaction kettle comprises a kettle body 1, and a reaction kettle cavity is formed in the kettle body 1; the heating layer (not shown) is arranged outside the kettle body 1, and heating oil and resistance wires are arranged in the heating layer and used for heating the kettle cavity of the reaction kettle; the lining 14 is arranged in the reaction kettle cavity, and an interlayer 22 is formed between the lining 14 and the reaction kettle cavity; wherein, the inner liner 14 is hollow and a spiral baffle plate 18 is arranged on the inner wall of the inner liner 14; the magnetic stirrer 10 comprises a stirring paddle 17 and a magnetic driver, and the magnetic driver is arranged at the end part of the stirring paddle 17; the other end of the stirring paddle 17 extends to the inside of the lining 14; the hydrothermal liquefaction reaction is carried out in the inner liner 14, the reacted solid is retained in the inner liner 14, and the reacted liquid can be discharged into the interlayer 22 through the hollow part of the inner liner 14, so that solid-liquid separation is realized.

More specifically, in embodiments of the present invention, the material subjected to the hydrothermal liquefaction reaction generally comprises lignocellulosic biomass. Lignocellulosic biomass is specifically defined as a raw material containing a cellulose component, and includes wood (such as poplar, eucalyptus, pine, etc.), forest processing waste, agricultural straw waste (such as corn stalk, wheat stalk, rice stalk, etc.), grass, etc., and a mixture of the above.

The material subjected to the hydrothermal liquefaction reaction contains a solid heterogeneous catalyst in addition to the lignocellulosic biomass. The solid heterogeneous catalyst has the advantages of good thermal stability, reusability, no corrosion to equipment, easy separation and the like, and has wide application prospect in the field of biomass catalytic conversion. The solid heterogeneous catalyst in the embodiment of the invention mainly comprises solid super acid, oxide, sulfide, molecular sieve, metal salt, natural clay ore, heteropoly acid, resin, carrier catalyst and the like, and the specific particle size can be controlled by a catalyst preparation process.

After the hydrothermal liquefaction reaction, the reaction kettle comprises a 'reacted solid material' and a 'bio-oil/chemical liquid-phase product', wherein the 'reacted solid material' comprises biomass, a solid heterogeneous catalyst and other solid substances. The biomass may be any biomass feedstock known in the art.

In a preferred embodiment of the present invention, the "post-reaction solid material" or solids are trapped within the liner 14; the "bio-oil/chemical liquid phase product" can flow into the interlayer 22 through the hollow.

Therefore, the aperture of the hollow part of the lining 14 is smaller than the particle size of the reacted solid material, so as to realize complete solid-liquid separation and provide convenience for subsequent product separation.

In an embodiment of the invention, shown in fig. 1 and 2, the liner 14 is in the form of a cylindrical screen, closed at the bottom and provided with internal threads 16 at the opening for securing purposes. The inner wall of the liner 14 is provided with a helical baffle 18 which, in cooperation with the magnetic stirrer 10, facilitates increased turbulence for thorough mixing and contact of the material with the solvent.

In the embodiment of the invention, as shown in fig. 1, a neck-equipped welding neck flange is arranged at the top of the reaction kettle, the neck-equipped welding neck flange comprises a flange plate 19 and a flange cover 20, and the flange plate 19 and the kettle body 1 are integrated; the flange 19 and the flange cover 20 are connected through a stud 21 and a nut 11. However, the sealing manner between the flange 19 and the flange cover 20 is not limited to this, and in other embodiments of the present invention, a quick-opening manner may be selected, that is, the snap ring and the corresponding bolt are pressed and fastened, and when the flange cover 20 is opened, the snap ring can be removed by loosening each jack screw several times, so as to realize quick opening of the flange cover 20.

In the preferred embodiment of the present invention, the reaction vessel is further provided with a lifting frame, a lifting mechanism and a turnover mechanism (not shown), wherein the lifting mechanism adopts the conventional technology such as a screw rod and a screw nut to drive the reaction vessel to vertically lift. The turnover mechanism adopts the existing conventional technology such as a rotating shaft and a turnover rod to drive the reaction kettle to carry out 180-degree turnover operation. In the embodiment of the present invention, the present invention is not limited to the above-mentioned lifting mechanism and turning mechanism, and any mechanism may be used as long as it can move up and down and turn the reaction kettle.

In an embodiment of the present invention, as shown in fig. 2, a magnetic stirrer mounting port 23 is provided on the flange cover 20, and the magnetic actuator is mounted to the magnetic stirrer mounting port 23 through the magnetic actuator housing 15.

In the embodiment of the invention, as shown in fig. 2, the inner wall of the top of the inner liner 14 is provided with internal threads 16, the end of the magnetic driver housing 15 extending into the reaction kettle cavity is provided with external threads, and the inner liner 14 is connected with the magnetic driver housing 15 through threads.

In the embodiment of the invention, a heating layer (not shown) is arranged outside the kettle body 1 of the reaction kettle, and the hydrothermal liquefaction reaction is carried out at a preset temperature by electrically heating through the heating layer; the heating layer adopts the working principle that electric energy is converted into heat energy, heat conduction oil is used as a heat transfer medium, the heat conduction oil is heated by using a resistance wire, and the heat conduction oil transfers the heat energy to a reaction kettle cavity.

The temperature control and monitoring of the hydrothermal liquefaction reaction are realized by an external program temperature controller, and the program temperature controller is respectively connected with the heating layer and the reaction kettle by temperature sensors.

In the embodiment of the invention, a temperature sensor probe mounting port, a pressure sensor probe mounting port and a dielectric constant test probe mounting port are further arranged on the flange cover 20, and the temperature sensor probe mounting port, the pressure sensor probe mounting port and the dielectric constant test probe mounting port are respectively vertically corresponding to the inside of the interlayer 23; as shown in fig. 1, the temperature sensor probe mounting port, the pressure sensor probe mounting port, and the dielectric constant test probe mounting port are used for mounting the temperature sensor probe 4, the pressure sensor probe 5, and the dielectric constant test probe 6, respectively.

It is worth mentioning that a temperature sensor probe mounting port, a pressure sensor probe mounting port and a dielectric constant test probe mounting port are further arranged on the flange cover 20, that is, a pressure sensor, a temperature sensor and a dielectric constant tester are mounted on the reaction kettle and used for monitoring each parameter of the reaction product in the interlayer 22 in real time.

In the embodiment of the present invention, as shown in fig. 1 and fig. 2, the lignocellulosic biomass hydrothermal liquefaction apparatus further includes a cooling water circulation pipeline 12, the cooling water circulation pipeline 12 is disposed in the interlayer 22, the cooling water circulation pipeline 12 is bent in a U-shape, and two ends of the cooling water circulation pipeline 12 are respectively connected to the cooling water inlet 3 and the cooling water outlet 8 of the flange cover 20. Used for quickly cooling the kettle cavity of the reaction kettle after the reaction is finished.

In the embodiment of the invention, the lignocellulose biomass hydrothermal liquefaction device further comprises an air inlet pipe 13, the air inlet pipe 13 is arranged in the interlayer 22, one end of the air inlet pipe 13 extends to the bottom of the kettle cavity of the reaction kettle, and the other end of the air inlet pipe 13 is connected with the air inlet 7 of the flange cover 20. For air replacement before hydrothermal liquefaction of lignocellulosic biomass, nitrogen is generally introduced into an air intake pipe as a shielding gas.

In the embodiment of the invention, after hydrothermal liquefaction reaction in a reaction kettle cavity is finished, the reaction kettle is cooled, after the temperature in the reaction kettle is reduced to room temperature, gas in the reaction kettle is collected, when the pressure in the reaction kettle is close to the ambient pressure, the reaction kettle is opened, and the reacted solid material is taken out along with a lining; the biological oil/chemical liquid phase product is subjected to subsequent product separation and storage treatment.

Generally, the biological oil/chemical liquid-phase product is not a pure liquid-phase product, some residues still remain and need to be further subjected to solid-liquid separation, and then the separated liquid phase is subjected to distillation, extraction and other steps to obtain biological oil/chemical products and the like; and the separated solid phase is treated by operations such as drying and the like to obtain residue.

Therefore, in order to be applied to the hydrothermal liquefaction reaction in the reaction tank of the present invention, the apparatus for hydrothermal liquefaction of lignocellulosic biomass of the present invention further includes a solid-liquid separator 26, a gas collection tank 25, a liquid collection tank 32, a distillation tank 29, a distillation condenser 31, a heating circulator 27, a peristaltic pump 30, and other devices for product post-treatment.

In the embodiment of the present invention, as shown in fig. 1 and 3, the flange cover 20 is further provided with a first exhaust port 2 and a second exhaust port 9, and the first exhaust port 2 and the second exhaust port 9 respectively correspond to the inside of the interlayer 22 in the vertical direction; more specifically, the first exhaust port 2 and the second exhaust port 9 are respectively provided with an exhaust valve, and one of the exhaust valves is connected with the gas collection tank 25 through a pipeline and is used for collecting gas in the reaction kettle; the other exhaust valve is used for replacing air in the reaction kettle before reaction.

In the embodiment of the present invention, as shown in fig. 3, the "bio-oil/chemical liquid-phase product" in the reaction tank is fed into the solid-liquid separator 26 for further solid-liquid separation.

A solid outlet of the solid-liquid separator 26 is connected with a heating circulator 27, and the heating circulator 27 is connected with a solid storage tank 28;

the liquid outlet of the solid-liquid separator 26 is connected with the inlet of the distillation still 29, wherein a peristaltic pump 30 is also arranged between the liquid outlet of the solid-liquid separator 26 and the inlet of the distillation still 29 and is used for transporting liquid-phase products; the outlet of the distillation still 29 is sequentially connected with a distillation condenser 31 and a liquid collecting tank 32, and is used for further distilling the liquid phase product to obtain a final product which is stored in the liquid collecting tank 32.

As another aspect of the present invention, as shown in fig. 3, there is also provided a lignocellulosic biomass hydrothermal liquefaction system comprising:

the lignocellulosic biomass hydrothermal liquefaction unit as described above;

and the photovoltaic power generation device is used for providing electric energy for the operation of the resistance wire of the heating layer and the magnetic stirrer 10.

The photovoltaic power generation device replaces conventional power: photovoltaic power generation is used as an external energy supply to provide power, so that the problem of unobvious economic benefit caused by high energy consumption is solved.

As shown in fig. 3, the photovoltaic power generation apparatus is an off-grid power generation system, and mainly includes a solar panel 33, a solar controller 34, an energy storage device (a storage battery 24), an ac/dc inverter 35, and the like, where the energy storage device (the storage battery 24) is preferably an electrochemical energy storage device, such as a lead-acid battery, a nickel-based battery, a lithium ion battery, a high-temperature battery, a redox flow battery, and the like.

More specifically, the photovoltaic power generation device of the invention provides power load for power consumption devices such as a resistance wire of a heating layer, a magnetic stirrer 10 and the like; the photovoltaic power generation system also supplies an electric load to the power consumption of equipment for product post-treatment, such as the distillation condenser 31, the heating circulator 27, and the peristaltic pump 30.

Example 1

The reaction kettle designed by the invention mainly aims at scientific research and experimental application of lignocellulose hydrothermal liquefaction, and a specific lignocellulose biomass hydrothermal liquefaction system is shown in figure 3. The hydrothermal liquefaction reaction is carried out in a novel reaction kettle, as shown in fig. 1 and 2, lignocellulose biomass is crushed to a proper particle size, the crushed biomass and a solid catalyst are put into a lining 14 (shown in fig. 2) and placed in the reaction kettle (the particle size of the catalyst is larger than that of a sieve pore of a circular cylinder sieve), then deionized water with a certain proportion is added, the mixture is uniformly stirred by a glass rod, the reaction kettle is sealed, and air in a kettle cavity of the reaction kettle is replaced by nitrogen or other active (inert) gas in a blowing mode.

This example 1 is a specific process of using a laboratory-scale micro reaction vessel as an object:

the selection of a correct material is very important for the design of pressure vessels that are required to withstand not only pressure, but also high temperatures, low temperatures and corrosion. At present, 12Cr having durable moldability and weldability₂Mo is the most commonly used low-alloy heat-resistant strong steel in all countries in the world, and is widely applied to high-temperature and high-pressure containers in petrochemical industry, firepower and nuclear power generating equipment.

The reaction kettle has the capacity of 500mL and is made of 12Cr₂Mo, the highest working pressure is 30MPa, the design pressure is 35MPa, the program temperature control rated temperature is 500 ℃, the power is 3kW, the magnetic stirrer has a 10 rated rotating speed of 3000rpm, and the diameter of the inner lining hole is 100 meshes (150 mm).

Selecting rice straws as a representative of lignocellulose biomass, crushing and screening the representative, and then selecting the biomass with the grain size of 30-50 meshes (0.300-0.600 mm) (note: ensuring the grain size to be less than 100 meshes (150 mm)). A granular HZSM-5 molecular sieve catalyst was selected as representative of the solid heterogeneous catalyst (note: guaranteed < 100 mesh (150 mm)). Putting 2g of HZSM-5 molecular sieve catalyst and 15g of rice straw powder into a reaction kettle lining 14, fixing the reaction kettle, then adding 150mL of deionized water, stirring uniformly by using a glass rod, sealing the reaction kettle, and purging and replacing air in the reaction kettle by using nitrogen.

The reactor is connected with a photovoltaic power generation device (the power is 3kW, the cost is estimated to be 3 ten thousand yuan at present) through the reactor, electric power is provided for heating the reactor, a certain reaction time is kept for 2 hours, and the rotating speed of the magnetic stirrer 10 is set to be proper, for example, 100r/min, so that the materials are fully mixed. After the reaction is finished, cooling the reaction kettle. When the temperature in the reaction kettle is reduced to room temperature, the exhaust valve is opened to collect gas, the reaction kettle is opened when the pressure in the reaction kettle is close to the ambient pressure, the lining 14 is taken out, and residues are cleaned by acetone. It is worth noting that the existing reaction kettle has no lining, the residue is distributed inside the reaction kettle and in pipelines, the cleaning process wastes cleaning solvent, the cost is increased, the time is consumed, and the cleaning is difficult. By applying the reaction kettle, the residue generated by the reaction only exists in the lining 14, and compared with the lining 14, the lining is easy to disassemble, small in area, convenient and quick to clean, and the using amount of cleaning solvent (acetone) is small. The liner 14 and the paddle 17 were rinsed with acetone in sequence to obtain a solid-liquid mixture. The mixture was filtered through a solid-liquid separator with acetone, and the solid separated therefrom was dried at 105 ℃ to constant weight, defined as residue. Mixing the liquid phases (water and oil) #1 and #2, evaporating in a distillation kettle 29 to obtain an oil (light oil and heavy oil) water mixture, extracting and separating by using dichloromethane to obtain a dichloromethane phase complex and water, evaporating the dichloromethane phase in a constant-temperature rotary water bath to remove the dichloromethane to obtain the bio-oil with the yield of 30-50 wt%, and further refining the bio-oil to obtain chemicals, wherein the specific flow is shown in figure 4.

According to the cost accounting estimation of the embodiment, as shown in the table 1, the raw material amount of each reaction of the whole process is 15g, the electric load of 3kW is 2h, and the bio-oil yield is about 30 to 50 wt%. The reaction time and treatment time were about 2.5h each, assuming that about 4 experiments per day were possible. The price of the rice straw is about 200-300 yuan/t. In the reaction process, all material cost, water cost and the like of nitrogen gas, water, acetone, dichloromethane and the like are also taken into consideration, the cost for producing the bio-oil of 1t is estimated to be 1000 yuan, the price of the bio-oil at present is 1900-2000 yuan/t, and the benefit of the invention is considerable by comparison.

In summary, the present invention has significant advantages in terms of production cost and separation process.

Table 1 comparison of the cost of the present invention with the cost of the existing conventional electrically driven, existing reactor liquefaction system

Note: the cost of producing 1t of bio-oil based on the examples.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. A lignocellulosic biomass hydrothermal liquefaction unit, comprising:

the reaction kettle comprises a kettle body, and a reaction kettle cavity is formed in the kettle body;

the heating layer is arranged on the outer side of the kettle body, and heating oil and a resistance wire are arranged in the heating layer and used for heating a kettle cavity of the reaction kettle;

the lining is arranged in the reaction kettle cavity, and an interlayer is formed between the lining and the reaction kettle cavity; the inner liner is hollow, and a spiral baffle plate is arranged on the inner wall of the inner liner;

the magnetic stirrer comprises a stirring paddle and a magnetic driver, and the magnetic driver is arranged at the end part of the stirring paddle; the other end of the stirring paddle extends to the inner part of the lining;

the hydrothermal liquefaction reaction is carried out in the inner liner, the reacted solid is retained in the inner liner, and the reacted liquid can be discharged into the interlayer through the hollow part of the inner liner, so that solid-liquid separation is realized.

2. The lignocellulosic biomass hydrothermal liquefaction device of claim 1, wherein a neck-butt welding flange is arranged at the top of the reaction kettle, the neck-butt welding flange comprises a flange plate and a flange cover, and the flange plate and the kettle body of the reaction kettle are integrated; the flange plate is connected with the flange cover through a stud and a nut.

3. The lignocellulosic biomass hydrothermal liquefaction unit of claim 2, wherein the flange cover is provided with a magnetic stirrer mounting port, and the magnetic actuator is mounted at the magnetic stirrer mounting port through a magnetic actuator housing of the magnetic actuator.

4. The lignocellulosic biomass hydrothermal liquefaction device of claim 3, wherein the inner wall of the top of the liner is internally threaded, the end of the magnetic actuator housing that extends into the reaction kettle cavity is externally threaded, and the liner is in threaded connection with the magnetic actuator housing.

5. The lignocellulosic biomass hydrothermal liquefaction device of claim 2, wherein the flange cover is further provided with a temperature sensor probe mounting port, a pressure sensor probe mounting port and a permittivity test probe mounting port, the temperature sensor probe mounting port, the pressure sensor probe mounting port and the permittivity test probe mounting port respectively vertically corresponding to the interlayer.

6. The lignocellulosic biomass hydrothermal liquefaction device of claim 2, further comprising a cooling water circulation pipeline disposed in the interlayer, wherein the cooling water circulation pipeline is bent in a U-shape, and two ends of the cooling water circulation pipeline are respectively connected to the cooling water inlet and the cooling water outlet of the flange cover.

7. The lignocellulosic biomass hydrothermal liquefaction device of claim 2, further comprising an air inlet pipe, wherein the air inlet pipe is disposed in the interlayer, one end of the air inlet pipe extends to the bottom of the kettle cavity of the reaction kettle, and the other end of the air inlet pipe is connected to the air inlet of the flange cover.

8. The lignocellulosic biomass hydrothermal liquefaction unit of claim 5, wherein the flange cover is further provided with a first exhaust port and a second exhaust port, the first exhaust port and the second exhaust port respectively corresponding to the interlayers in a vertical direction.

9. A lignocellulosic biomass hydrothermal liquefaction system, comprising:

the lignocellulosic biomass hydrothermal liquefaction unit of any one of claims 1 to 8;

and the photovoltaic power generation device is used for providing electric energy for the operation of the resistance wire of the heating layer and the magnetic stirrer.

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