CN114470953A - Hydrothermal liquefaction product separation device and method - Google Patents

Abstract

The invention provides a hydrothermal liquefied product separation device and a method, wherein the hydrothermal liquefied product separation device comprises a cooler, a high-pressure filter, a back pressure valve, a gas-liquid separator and an oil-water separator; the outlet of the cooler is communicated with a product feeding hole of the high-pressure filter; the inlet and the outlet of the back pressure valve are respectively communicated with a product discharge port of the high-pressure filter and a gas-liquid inlet of the gas-liquid separator; the liquid phase outlet of the gas-liquid separator is communicated with the liquid phase inlet of the oil-water separator. The hydrothermal liquefaction product is cooled by a cooler, then enters a high-pressure filter to remove solid residues, the residue-free product is depressurized by a back pressure valve and then passes through a gas-liquid separator and an oil-water separator to respectively obtain gas phase, water phase and oil phase products.

Description

A kind of hydrothermal liquefaction product separation device and method

technical field

The invention relates to the technical field of biomass hydrothermal liquefaction, in particular to a hydrothermal liquefaction product separation device and method.

Background technique

my country has abundant biomass resources, including crop straw, forest waste and firewood, organic waste, energy plants, domestic waste, municipal sludge, wastewater, livestock and poultry manure, etc. Biomass can be used as a raw material for hydrothermal liquefaction technology, using water as a solvent, and under the reaction conditions of high temperature of 200-400℃ and high pressure of 5-25MPa, a series of thermochemical changes will occur to convert it into bio-crude oil. The use of hydrothermal liquefaction technology to process biomass resources does not require drying of raw materials, saving energy, and the conversion rate of hydrothermal liquefaction is fast. All components of raw materials can participate in the reaction, and the reaction is relatively complete. At the same time, it can convert biomass with low energy density. Resources are converted into biocrude oil with high energy density. After upgrading and refining, bio-crude oil can be used as a substitute for petroleum and can also be used to produce high value-added chemicals, which is of great significance for alleviating the shortage of fossil energy and environmental pollution in my country. The hydrothermal liquefaction product includes gas phase, oil phase, water phase and solid phase, and the composition is complex, so it is difficult to use directly. At the same time, the moisture content will also lead to lower calorific value of bio-crude oil or difficult to burn directly. Although the products of each phase will be separated to a certain extent due to the difference in density and state, there will be small solid particles of suspended oil in the oil phase and water phase, light oil in the water phase and water in the oil phase, etc. Certain technical means can completely separate the four-phase products, and then the next step of bio-crude oil refining, oil quality improvement and separation and extraction of high value-added small molecular compounds can be carried out to realize the effective utilization of hydrothermal products. Therefore, the effective separation of high-temperature and high-pressure four-phase products is one of the difficult problems to be overcome in continuous hydrothermal liquefaction systems.

At present, the domestic research on continuous hydrothermal liquefaction of biomass mainly focuses on the entire continuous reaction system. Details of the device. Some of the existing separation devices have limitations on the hydrothermal liquefaction of biomass raw materials; some do not separate the oil phase and the water phase; some set the back pressure valve before the product separator, and the presence of solid residues will cause wear and tear The back pressure valve may block the back pressure valve and affect the normal operation of the system; some slag discharge processes cannot ensure the pressure stability of the system; some use centrifugal or extraction separation methods, which require centrifuges, solvent evaporation and other equipment, cost and High energy consumption. The present invention aims to explore how to improve the separation efficiency of four-phase products while ensuring pressure stability through mechanical and physical methods, to achieve continuous separation of hydrothermal liquefaction products, without centrifugal equipment and environmentally unfriendly chemical reagents, and to avoid chemical reagents and products. The chemical reaction occurs between them to change the product components, and at the same time, the cost input and energy consumption are reduced.

SUMMARY OF THE INVENTION

The embodiment of the present invention provides a hydrothermal liquefaction product separation device and method, aiming at separation according to the physical properties of the product, so as to improve the product separation efficiency, reduce the operating cost and energy consumption, and at the same time, ensure the continuity and pressure stability of the separation process sex.

The embodiment of the present invention provides a hydrothermal liquefaction product separation device, including a cooler, a high-pressure filter, a back pressure valve, a gas-liquid separator and an oil-water separator;

The inlet of the cooler is used to communicate with the hydrothermal liquefaction reaction system, and the outlet of the cooler communicates with the product feed port of the high-pressure filter;

The inlet and outlet of the back pressure valve are respectively connected to the product discharge port of the high pressure filter and the gas-liquid inlet of the gas-liquid separator;

The liquid-phase outlet of the gas-liquid separator communicates with the liquid-phase inlet of the oil-water separator.

According to the hydrothermal liquefaction product separation device according to an embodiment of the present invention, the hydrothermal liquefaction product separation device further comprises a product collection tank;

The inlet of the cooler is communicated with a product feeding pipeline, a first pressure instrument and a first temperature instrument are arranged on the part of the product feeding pipeline far from the inlet of the cooler, and the product feeding pipeline The part close to the inlet of the cooler communicates with the first feed port of the product collection tank through a first branch;

The outlet of the cooler is communicated with the product inlet of the high-pressure filter through the product outlet pipeline, and the part of the product outlet pipeline close to the outlet of the cooler is provided with a second temperature instrument, so The part of the product discharge pipeline close to the product feed port of the high-pressure filter is communicated with the second feed port of the product collection tank through a second branch;

A first bursting disc and a second bursting disc are respectively provided on the first branch and the second branch.

According to the hydrothermal liquefaction product separation device according to an embodiment of the present invention, the hydrothermal liquefaction product separation device further comprises a slag storage tank;

The slag discharge port of the high-pressure filter is communicated with the slag inlet port of the slag storage box through a slag discharge pipeline, and a slag discharge valve is arranged on the slag discharge pipeline.

According to the hydrothermal liquefaction product separation device according to an embodiment of the present invention, the high-pressure filter includes a casing and a filter element, the filter element is located in the casing, and the filter element is connected to the inner side wall of the top of the casing;

The top of the shell is provided with a product feed port and a product discharge port, the product discharge port is arranged corresponding to the filter element, and the bottom of the shell is provided with a slag discharge port;

The top of the casing is provided with a differential pressure transmitter.

According to the hydrothermal liquefaction product separation device according to an embodiment of the present invention, a plurality of the high-pressure filters are provided for switching the plurality of high-pressure filters for slag discharge.

According to the hydrothermal liquefaction product separation device according to an embodiment of the present invention, the hydrothermal liquefaction product separation device further comprises a gas storage cylinder, and the gas outlet of the gas storage cylinder and the product discharge outlet of the high pressure filter pass through a gas transmission pipeline A gas delivery valve and a supercharger are arranged on the gas delivery pipeline.

According to the hydrothermal liquefaction product separation device according to an embodiment of the present invention, the outlet of the back pressure valve is communicated with the gas-liquid inlet of the gas-liquid separator through a gas-liquid pipeline, and the gas-liquid pipeline is provided with a third temperature meter; and/or,

The hydrothermal liquefaction product separation device further comprises a gas collection bottle, the inlet of the gas collection bottle is connected to the gas-phase outlet of the gas-liquid separator.

According to the hydrothermal liquefaction product separation device according to an embodiment of the present invention, the oil-water separator includes an oil outlet barrel extending in a horizontal direction;

An oil-water mixture channel is arranged in the oil outlet barrel, the oil-water mixture channel extends in the horizontal direction, the inner side wall of the oil-water mixture channel is provided with a super-hydrophobic and super-oleophilic mesh membrane, and the top and bottom of the oil-water mixture channel are both an opening is provided to communicate the oil-water mixture channel and the oil outlet;

The oil outlet is provided with a liquid phase inlet and a water phase outlet, the liquid phase inlet and the water phase outlet are respectively connected to both ends of the oil-water mixture channel, and the bottom of the oil outlet is close to the water phase outlet One side is provided with an oil phase outlet.

According to the hydrothermal liquefaction product separation device according to an embodiment of the present invention, the liquid phase outlet of the gas-liquid separator is communicated with the liquid phase inlet of the oil-water separator through a drain pipeline, and the drain pipeline is provided with a drain liquid valve; and/or,

The hydrothermal liquefaction product separation device further includes an oil storage tank and a water storage tank, and the inlet of the oil storage tank and the inlet of the water storage tank are respectively connected to the oil phase outlet and the water phase outlet of the oil-water separator.

The embodiment of the present invention also provides a method for separating hydrothermal liquefaction products, comprising:

Set the pilot pressure of the back pressure valve and the signal value of the differential pressure transmitter;

The high-temperature and high-pressure hydrothermal liquefaction product flows into the cooler to cool the hydrothermal liquefaction product to a preset temperature value;

The hydrothermal liquefaction product after cooling flows into the high pressure filter to separate solid residue and liquid-gas mixed product;

The liquid-gas mixed product is depressurized by the back pressure valve and then flows into the gas-liquid separator to separate gas-phase products and liquid-phase products;

The liquid-phase product flows into an oil-water separator to separate water-phase products and oil-phase products.

The hydrothermal liquefaction product separation device provided by the embodiment of the present invention includes a cooler, a high-pressure filter, a back pressure valve, a gas-liquid separator and an oil-water separator, and the materials required for preparing each device are relatively common and have low cost; the hydrothermal liquefaction reaction The generated high temperature and high pressure product is cooled by the cooler, and then enters the high pressure filter to remove the solid residue. The residue-free product is depressurized by the back pressure valve and then passes through the gas-liquid separator and the oil-water separator to obtain gas phase, water phase and oil phase products respectively. The hydrothermal liquefaction product separation device has good continuity, complete product separation, simple operation process, convenient manufacturing and installation, and at the same time, does not require chemical reagent input or centrifugal equipment, low cost and low operating energy consumption, and can be widely used in biomass continuous Separation of hydrothermal liquefaction reaction products.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

Fig. 1 is the structural representation of a kind of hydrothermal liquefaction product separation device provided by the embodiment of the present invention;

Fig. 2 is the structural representation of the high pressure filter in Fig. 1;

Fig. 3 is the pressure change curve diagram of the hydrothermal liquefaction system before and after the high-pressure filter slag discharge in Fig. 1;

FIG. 4 is a schematic structural diagram of the oil-water separator in FIG. 1 .

Reference number:

100: hydrothermal liquefaction product separation device; 1: first pressure instrument; 2: first temperature instrument; 3: first rupture disc; 4: cooler; 5: second temperature instrument; 6: second rupture disc; 7 : product collection tank; 8: gas delivery valve; 9: back pressure valve; 10: third temperature instrument; 11: second pressure instrument; 12: gas-liquid separator; 13: gas collection bottle; 14: drain valve; 15: oil-water separator; 151: oil outlet; 152: oil-water mixture channel; 153: liquid phase inlet; 154: superhydrophobic and superoleophilic membrane; 155: oil phase outlet; 156: water phase outlet; 16: oil storage Tank; 17: Water storage tank; 18: Booster; 19: Gas cylinder; 20: Slag storage tank; 21: Slag discharge valve; 22: High pressure filter; 221: Product inlet; 222: Differential pressure generator 223: product discharge port; 224: cover body; 225: shell; 226: filter element; 227: slag discharge port; 23: circulating water pump; 24: cooling water tank.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

An embodiment of the present invention provides a hydrothermal liquefaction product separation device. As shown in FIG. 1 , the hydrothermal liquefaction product separation device includes a cooler 4, a high-pressure filter 22, a back pressure valve 9, a gas-liquid separator 12, and an oil-water separation device. device 15.

As shown in FIG. 1 , the inlet of the cooler 4 is used to communicate with the hydrothermal liquefaction reaction system, and the outlet of the cooler 4 is communicated with the product feed port 221 of the high-pressure filter 22 . The cooler 4 cools the product through convection heat exchange (as shown in Figure 1, the cooler 4 is in circulation with the circulating water pump 23 and the cooling water tank 24), the top of the cooler 4 is provided with an inlet and an outlet, and the outlet of the cooler 4 is connected to the high-pressure filter. As shown in Figure 1, in this embodiment, the hydrothermal liquefaction product separation device also includes a product collection tank 7; the inlet of the cooler 4 is connected with a product feed pipeline, and the product feed pipeline is far away from the cooler A first pressure instrument 1 and a first temperature instrument 2 are arranged on the part of the inlet of 4, and the part of the product feed pipeline close to the inlet of the cooler 4 is communicated with the first feed port of the product collection tank 7 through the first branch. ; The outlet of the cooler 4 is communicated with the product inlet 221 of the high pressure filter 22 through the product discharge pipeline, and the part of the product discharge pipeline close to the outlet of the cooler 4 is provided with a second temperature instrument 5, and the product discharges The part of the pipeline close to the product feed port 221 of the high pressure filter 22 is communicated with the second feed port of the product collection tank 7 through the second branch; the first branch and the second branch are respectively provided with a first bursting disc 3 and the second rupture disc 6.

As shown in FIG. 1 and FIG. 2 , the high-pressure filter 22 is a sealed structure, which can filter and remove solid residues in the product. The high-pressure filter 22 mainly includes a casing (as shown in FIG. 2 , the casing includes a cover 224 and a casing 225 ) , the cover body 224 covers the outer shell 225) and the filter element 226, the filter element 226 is located in the shell, and the filter element 226 is connected to the inner side wall of the top of the shell; Corresponding to the filter element 226, the bottom of the casing is provided with a slag discharge port 227; the top of the casing is provided with a differential pressure transmitter 222. The hydrothermal liquefaction product separation device also includes a slag storage tank 20; the slag discharge port 227 of the high pressure filter 22 is connected with the slag inlet port of the slag storage tank 20 through a slag discharge pipeline, and a slag discharge valve 21 is provided on the slag discharge pipeline. The differential pressure transmitter 222 can detect the internal and external pressure difference of the filter element 226. Preferably, the set signaling value of the differential pressure transmitter 222 is 0.35MPa.

As shown in FIG. 1 , the inlet and outlet of the back pressure valve 9 are respectively connected to the product discharge outlet 223 of the high pressure filter 22 and the gas-liquid inlet of the gas-liquid separator 12 . The back pressure valve 9 is used to reduce the product pressure and is arranged on the pipeline between the high pressure filter 22 and the gas-liquid separator 12. As shown in FIG. 1, the outlet of the back pressure valve 9 and the gas-liquid inlet of the gas-liquid separator 12 pass through The gas-liquid pipeline is connected, and a third temperature instrument 10 is arranged on the gas-liquid pipeline. The back pressure valve 9 is arranged on the pipeline between the high pressure filter 22 and the gas-liquid separator 12. The product removes solid residues and then passes through the back pressure valve 9, which can effectively prevent the back pressure valve 9 from being worn or blocked. Wherein, the number of gas-liquid separators 12 may be one, two or more, and preferably, the number of gas-liquid separators 12 may be one.

As shown in FIG. 1 , the liquid phase outlet of the gas-liquid separator 12 is connected to the liquid phase inlet 153 of the oil-water separator 15 . The gas-liquid separator 12 separates the gas-phase and liquid-phase products by gravity sedimentation. The top of the gas-liquid separator 12 is provided with a gas-phase outlet. The gas-liquid separator 12 is connected to the inlet of the gas collection bottle 13. The bottom is provided with a liquid phase outlet, the liquid phase outlet of the gas-liquid separator 12 is connected with the liquid phase inlet 153 of the oil-water separator 15 ; the gas-liquid separator 12 is provided with a second pressure gauge 11 at the gas-phase product outlet.

The oil-water separator 15 separates the oil-phase and water-phase products through special surface wetting properties, as shown in FIG. 4 , in this embodiment, the oil-water separator 15 uses a super-hydrophobic and super-oleophilic mesh membrane 154 for oil-water separation. 15 includes an oil outlet barrel 151 extending in the horizontal direction; the oil outlet barrel 151 is provided with an oil-water mixture channel 152, the oil-water mixture channel 152 extends in the horizontal direction, and the superhydrophobic and superoleophilic mesh membrane 154 is rolled into a tubular shape and attached to the oil-water mixture channel 152 The inner side wall of the oil-water mixture channel 152 is fixed with U-shaped clips at both ends; the top and bottom of the oil-water mixture channel 152 are provided with rectangular openings with an included angle of 120° to communicate the oil-water mixture channel 152 and the oil outlet barrel 151; the oil outlet barrel 151 is provided with a liquid The phase inlet 153 and the water phase outlet 156, the liquid phase inlet 153 and the water phase outlet 156 are respectively connected to both ends of the oil-water mixture channel 152. The water phase outlet 156 and the oil phase outlet 155 communicate with the water storage tank 17 and the oil storage tank 16, respectively. The liquid-phase outlet of the gas-liquid separator 12 is communicated with the liquid-phase inlet 153 of the oil-water separator 15 through a liquid discharge pipeline, and the liquid discharge pipeline is provided with a liquid discharge valve 14 . The number of oil-water separators 15 can be 1-7, preferably, the number of oil-water separators 15 is 4, and the oil-water separators 15 are connected in series. Both the top and bottom of the oil-water mixture channel 152 are provided with openings, which can not only separate the floating oil phase, but also separate small oil droplets mixed in the water phase; at the same time, by connecting a plurality of oil-water separators 15 in series, the oil-water separation can be further improved. Compared with the single oil-water separator 15, the oil-water separation effect can be improved by 5-15%.

The hydrothermal liquefaction product separation device provided in the embodiment of the present invention includes a cooler 4, a high-pressure filter 22, a back pressure valve 9, a gas-liquid separator 12, and an oil-water separator 15, and the materials required for preparing each device are relatively common and have low cost The high temperature and high pressure product produced by the hydrothermal liquefaction reaction is cooled by the cooler 4, and then enters the high pressure filter 22 to remove the solid residue. The gas phase, water phase and oil phase products are obtained. The hydrothermal liquefaction product separation device has good continuity, complete product separation, simple operation process, convenient manufacturing and installation, and at the same time, no chemical reagent input or centrifugal equipment is required, the cost is low, and the operating energy consumption is low. It can be widely used in the separation of biomass continuous hydrothermal liquefaction reaction products.

The high-pressure filter 22 is connected with the pressurized air supply device, and the pressurized air supply device is communicated with the product discharge port 223 of the high-pressure filter 22, and gas is input into the high-pressure filter 22, and the pressure in the high-pressure filter 22 is increased to a level with water. The thermal liquefaction reaction pressure is equal. Specifically, as shown in FIG. 1 , in this embodiment, the hydrothermal liquefaction product separation device further includes a gas storage cylinder 19 , the gas outlet of the gas storage cylinder 19 and the product discharge port of the high-pressure filter 22 223 is communicated through a gas delivery pipeline, which is provided with a gas delivery valve 8 and a booster 18 , that is, the booster gas delivery device includes a gas storage bottle 19 , a booster pump 18 and a gas delivery valve 8 . Further, in order to avoid chemical reaction between the gas delivered by the pressurized gas supply device and the product, an inert gas is delivered into the high pressure filter 22 , preferably, nitrogen gas is delivered into the high pressure filter 22 .

The main body material of the high pressure filter 22 may not be particularly limited, for example, the main body material of the high pressure filter 22 may be stainless steel, carbon steel and other materials. The high-pressure filter 22 can remove solid residues during the product flow process under the pressure of the hydrothermal liquefaction reaction, without first reducing the product pressure through the back pressure valve 9, which not only avoids the wear of the solid residues and blocks the back pressure valve 9, but also ensures separation. Process continuity; multiple high-pressure filters 22 can be provided to switch multiple high-pressure filters 22 for slag discharge. For example, two high-pressure filters 22 are provided and connected by a three-way valve. The switching between the high-pressure filters 22 discharges solid residues. After the solid residues are emptied, the high-pressure filters 22 are re-pressurized to the reaction pressure to ensure the pressure stability of the separation process; the differential pressure transmitter 222 is used to detect the internal and external pressure of the filter element 226 If the pressure difference reaches a level that seriously affects the filtering performance of the filter element 226, a prompt for solid residue discharge will be issued. The high-pressure filter 22 switches the filtering product to discharge the solid residue; before and after the discharge, the internal pressure change curve of the high-pressure filter 22 is compared with the pressure change curve of the hydrothermal liquefaction system, as shown in FIG. Affect the pressure of the hydrothermal liquefaction product separation device to ensure the stable operation of the hydrothermal liquefaction product separation device. The high-pressure filter 22 removes solid residues without extraction, precipitation or centrifugal separation, reducing the required equipment, reducing operating costs and energy consumption, and the product after passing through the high-pressure filter 22 contains almost no solid residues, and the separation effect is good.

The main material of the oil-water separator 15 may be glass or acrylic board, which is not specifically limited here. The oil-water separator 15 is provided with a super-hydrophobic and super-oleophilic mesh membrane 154, and the substrate of the super-hydrophobic and super-oleophilic mesh membrane 154 can be a stainless steel mesh, or a metal mesh such as a copper mesh, and the mesh number is 200-500 mesh, and the preparation method can be For chemical etching, it can also be a method such as electrospinning that can change the surface roughness of the material at the nanoscale, which is not specifically limited here. Using the special surface wetting properties, the superhydrophobic and superoleophilic mesh membrane 154 is prepared and the oil-water separator 15 is designed. The oil phase will gradually adsorb to the surface of the superhydrophobic and superoleophilic mesh membrane 154. The contact angle of 154 is small, and it can aggregate and roughen on the surface of the superhydrophobic and superoleophilic mesh 154 and enter the oil outlet 151 through the superhydrophobic and superoleophilic mesh 154, while the water phase and the superhydrophobic and superoleophilic mesh The contact angle of the membrane 154 is too large to be retained, thereby realizing oil-water separation; the superhydrophobic and superoleophilic mesh membrane 154 is simple to prepare and has low cost, and has high separation efficiency, long life and anti-pollution. The oil-water separation effect of the super-hydrophobic and super-oleophilic mesh membrane 154 can reach 80%-90%, without the input of chemical reagents, without solvent evaporation recovery, centrifuges and other equipment, and is environmentally friendly and has low operating costs and energy consumption.

The embodiment of the present invention also provides a method for separating hydrothermal liquefaction products, which is realized based on the hydrothermal liquefaction product separation device as described above, and the method for separating hydrothermal liquefaction products includes:

In step S110, a superhydrophobic and superoleophilic omentum 154 is prepared.

Optionally, a 400-mesh stainless steel mesh is used as a substrate to prepare a superhydrophobic and superoleophilic mesh membrane 154 by chemical etching.

Step S120 , set the pilot pressure of the back pressure valve 9 and the signal value of the differential pressure transmitter 222 .

Specifically, according to the pressure of the hydrothermal liquefaction reaction, the pilot pressure is preset for the back pressure valve 9, and the range of the pilot pressure is 0-25MPa; the signal value is set for the differential pressure transmitter 222, and the range of the signal value is 0 -1MPa, preferably, the differential pressure signalling value set for the differential pressure signalling device 222 is 0.35MPa.

In step S130, the high-temperature and high-pressure hydrothermal liquefaction product flows into the cooler 4 to cool the hydrothermal liquefaction product to a preset temperature value.

Optionally, the range of the preset temperature value is 70-100°C, to ensure that the back pressure valve 9 will not fail due to high temperature, to ensure that the bio-crude oil in the hydrothermal liquefaction product has a low viscosity and will not stick to the pipeline or equipment, and at the same time. , to ensure that the temperature is below the saturation temperature of water, to avoid the water phase gasification and mixing into the gas phase.

In step S140, the cooled hydrothermal liquefaction product flows into the high pressure filter 22 to separate the solid residue and the liquid-gas mixed product.

Specifically, the product cooled in step S130 enters one of the high-pressure filters 22, and the product flows into the high-pressure filter 22 from the pipeline. The sudden increase in volume causes the flow rate of the product to decrease significantly, making it easier for the residue to be trapped in the container. The bottom is precipitated, the liquid and gas phase products pass through the filter element 226 and flow out from the product discharge port 223 at the top, and the solid residue is temporarily stored in the shell 225 of the high pressure filter 22 .

The existence of solid residues in the high pressure filter 22 will cause a pressure difference inside and outside the filter element 226. When the pressure difference reaches 0.35MPa, the pressure difference transmitter 222 will send a signal, and the product will be switched to another idle high pressure filter 22. Filter, then open the slag discharge valve 227 at the bottom of the high-pressure filter 22, and discharge the solid residue into the slag storage box 20; close the slag discharge valve 227 after the residue is emptied, open the gas delivery valve 8 at the top, and the high-pressure filter 22 liters Press to the hydrothermal liquefaction reaction pressure, then close the gas delivery valve 8 and wait for the next filtration.

In step S150, the liquid-gas mixed product is depressurized by the back pressure valve 9 and then flows into the gas-liquid separator 12 to separate gas-phase products and liquid-phase products.

Specifically, the slag-free product obtained in step S140 is reduced in pressure through the back pressure valve 9; the back pressure valve 9 automatically controls the flow of the product in the pipeline according to the set pilot pressure, and maintains the system pressure in a stable state; when the product in the pipeline When the pressure is greater than the pilot pressure, the valve automatically opens to release the product; when the product pressure in the pipeline is less than the pilot pressure, the valve automatically closes to trap the product.

The product depressurized by the back pressure valve 9 enters the gas-liquid separator 12, and the sudden expansion of the space causes the flow rate to decrease. Then, due to the action of gravity, the liquid phase flows downward and the gas phase floats up to generate separation, and the separated gas phase product enters the gas collection bottle 13. , the liquid-phase product flows out from the liquid-phase outlet at the bottom of the gas-liquid separator 12 .

In step S160, the liquid-phase product flows into the oil-water separator 15 to separate the water-phase product and the oil-phase product.

Specifically, the liquid phase product enters the oil-water separator 15, and when flowing in the oil-water mixture channel 152, the oil phase is gradually adsorbed to the surface of the superhydrophobic and superoleophilic mesh membrane 154. The contact angle of the water phase is relatively small, and it can gather and roughen on the surface of the omentum and enter the oil outlet 151 through the omentum, and flow into the oil storage tank 16 through the oil phase outlet 155; the contact angle between the water phase and the omentum is too large and is trapped Within the channel, the onward flow continues from the aqueous phase outlet 156 into the water storage tank 17 .

Example 1:

The hydrothermal liquefaction product of pig manure is separated by the hydrothermal liquefaction product separation device of the present invention. Among them, the moisture content of pig manure is 82%, the hydrothermal liquefaction reaction temperature is 305℃, the system pressure is 10.3MPa, and the reaction time is 30min. The lowest content is 11.2%, and the highest calorific value is 38.5MJ/kg.

Example 2:

The hydrothermal liquefaction product of microalgae is separated by the hydrothermal liquefaction product separation device of the present invention. Among them, the water content of microalgae is 82%, the hydrothermal liquefaction reaction temperature is 320℃, the system pressure is 20.0MPa, and the reaction time is 15min. The lowest content is 9.9%, and the highest calorific value is 39.3MJ/kg.

Example 3:

The hydrothermal liquefaction product separation device of the present invention is used to separate the hydrothermal liquefaction product of kitchen waste. Among them, the water content of kitchen waste is 78%, the hydrothermal liquefaction reaction temperature is 300°C, the system pressure is 12.8MPa, and the reaction time is 30min. The lowest oxygen content is 6.5%, and the highest calorific value is 37.2MJ/kg.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it can still be The technical solutions described in the foregoing embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. a hydrothermal liquefaction product separation device, is characterized in that, comprises cooler, high pressure filter, back pressure valve, gas-liquid separator and oil-water separator; The inlet of the cooler is used to communicate with the hydrothermal liquefaction reaction system, and the outlet of the cooler communicates with the product feed port of the high-pressure filter; The inlet and outlet of the back pressure valve are respectively connected to the product discharge port of the high pressure filter and the gas-liquid inlet of the gas-liquid separator; The liquid-phase outlet of the gas-liquid separator communicates with the liquid-phase inlet of the oil-water separator. 2. The hydrothermal liquefaction product separation device according to claim 1, wherein the hydrothermal liquefaction product separation device further comprises a product collection tank; The inlet of the cooler is communicated with a product feeding pipeline, a first pressure instrument and a first temperature instrument are arranged on the part of the product feeding pipeline far from the inlet of the cooler, and the product feeding pipeline The part close to the inlet of the cooler communicates with the first feed port of the product collection tank through a first branch; The outlet of the cooler is communicated with the product inlet of the high-pressure filter through the product outlet pipeline, and the part of the product outlet pipeline close to the outlet of the cooler is provided with a second temperature instrument, so The part of the product discharge pipeline close to the product feed port of the high-pressure filter is communicated with the second feed port of the product collection tank through a second branch; A first bursting disc and a second bursting disc are respectively provided on the first branch and the second branch. 3. The hydrothermal liquefaction product separation device according to claim 1, wherein the hydrothermal liquefaction product separation device further comprises a slag storage tank; The slag discharge port of the high-pressure filter is communicated with the slag inlet port of the slag storage box through a slag discharge pipeline, and a slag discharge valve is arranged on the slag discharge pipeline. 4 . The hydrothermal liquefaction product separation device according to claim 1 , wherein the high-pressure filter comprises a casing and a filter element, the filter element is located in the casing, and the filter element is connected to the top of the casing. 5 . inner wall; The top of the shell is provided with a product feed port and a product discharge port, the product discharge port is arranged corresponding to the filter element, and the bottom of the shell is provided with a slag discharge port; The top of the casing is provided with a differential pressure transmitter. 5 . The hydrothermal liquefaction product separation device according to claim 1 , wherein a plurality of high-pressure filters are provided for switching the plurality of high-pressure filters to discharge slag. 6 . 6 . The hydrothermal liquefaction product separation device according to claim 1 , wherein the hydrothermal liquefaction product separation device further comprises a gas storage cylinder, the gas outlet of the gas storage cylinder and the product of the high pressure filter. 7 . The discharge port is communicated through a gas delivery pipeline, and the gas delivery pipeline is provided with a gas delivery valve and a supercharger. 7. The hydrothermal liquefaction product separation device according to any one of claims 1-6, wherein the outlet of the back pressure valve is communicated with the gas-liquid inlet of the gas-liquid separator through a gas-liquid pipeline, A third temperature instrument is provided on the gas-liquid pipeline; and/or, The hydrothermal liquefaction product separation device further comprises a gas collection bottle, the inlet of the gas collection bottle is connected to the gas-phase outlet of the gas-liquid separator. 8. The hydrothermal liquefaction product separation device according to any one of claims 1-6, wherein the oil-water separator comprises an oil outlet barrel extending in a horizontal direction; An oil-water mixture channel is arranged in the oil outlet barrel, the oil-water mixture channel extends in the horizontal direction, the inner side wall of the oil-water mixture channel is provided with a super-hydrophobic and super-oleophilic mesh membrane, and the top and bottom of the oil-water mixture channel are both an opening is provided to communicate the oil-water mixture channel and the oil outlet; The oil outlet is provided with a liquid phase inlet and a water phase outlet, the liquid phase inlet and the water phase outlet are respectively connected to both ends of the oil-water mixture channel, and the bottom of the oil outlet is close to the water phase outlet One side is provided with an oil phase outlet. 9. The hydrothermal liquefaction product separation device according to any one of claims 1-6, wherein the liquid-phase outlet of the gas-liquid separator and the liquid-phase inlet of the oil-water separator pass through a drain pipeline connected, a drain valve is provided on the drain pipeline; and/or, The hydrothermal liquefaction product separation device further comprises an oil storage tank and a water storage tank, and the inlet of the oil storage tank and the inlet of the water storage tank are respectively connected to the oil phase outlet and the water phase outlet of the oil-water separator. 10. A method for separating hydrothermal liquefaction products, comprising: Set the pilot pressure of the back pressure valve and the signal value of the differential pressure transmitter; The high-temperature and high-pressure hydrothermal liquefaction product flows into the cooler to cool the hydrothermal liquefaction product to a preset temperature value; The hydrothermal liquefaction product after cooling flows into the high-pressure filter to separate solid residue and liquid-gas mixed product; The liquid-gas mixed product is depressurized by the back pressure valve and then flows into the gas-liquid separator to separate gas-phase products and liquid-phase products; The liquid-phase product flows into an oil-water separator to separate water-phase products and oil-phase products.

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