System and method for magnetic induction electric field enhanced liquid biomass pyrolysis

Abstract

The application discloses a system and method for liquid-phase biomass pyrolysis intensified by magnetic induction electric field. The system comprises a pre-reaction unit, a first reaction container and a first reaction condition; an intensified reaction unit, a second reaction container and a second reaction condition, the second reaction container is connected with the first reaction container and can be used for the second pyrolysis reaction of liquid-phase biomass; and the intensified reaction unit further comprises a magnetic loop and an alternating or pulsed magnetic field generating assembly, the second reaction container comprises at least one loop structure, the loop structure is arranged in the same magnetic loop with the alternating or pulsed magnetic field generating assembly, the alternating or pulsed magnetic field generating assembly is used for providing an alternating or pulsed magnetic field, and liquid-phase biomass flowing through the loop structure can form an induced current in the alternating or pulsed magnetic field. The application avoids energy consumption in the medium heat transfer process, and greatly improves the heat energy utilization rate.

Description

Technical Field

[0001] This invention relates to a system and method for enhancing liquid-phase biomass pyrolysis with magnetic induction electric field, belonging to the field of biomass resource utilization technology. Background Technology

[0002] In a broad sense, biomass refers to all plants, microorganisms, and animals that feed on plants and microorganisms, as well as their waste products. In a narrow sense, it refers to materials from agricultural and forestry production processes, excluding grains and fruits, such as straw, lignocellulosic materials from trees, byproducts of agricultural product processing, agricultural and forestry waste, and livestock manure and waste from animal husbandry. As one of the most promising renewable resources to replace fossil fuels, biomass has received increasing attention. my country has a vast territory and abundant natural resources, including a wide range of usable biomass resources with high yields. In recent years, many researchers have actively conducted research on the development and utilization of biomass resources, achieving certain results. This has not only reduced the country's dependence on foreign energy sources but also avoided significant resource waste.

[0003] Biomass pyrolysis technology is a method of biomass resource utilization. It involves breaking down macromolecules such as cellulose and lignin in biomass at high temperatures to produce biochar, bio-oil, or gas. It is also currently the most commonly used thermochemical conversion method for biomass resource utilization. Current pyrolysis equipment is mainly divided into batch and continuous types. Batch pyrolysis cannot operate continuously, which is not conducive to industrial-scale application. While continuous pyrolysis can achieve uninterrupted production, most equipment relies on direct combustion heating or medium heat transfer, resulting in significant heat loss, low energy utilization, and substantial self-consumption. Therefore, promoting and developing new technologies for biomass pyrolysis is of great significance.

[0004] CN 105038835 A discloses a method that uses ionic liquid as a catalytic reaction medium to induce electrochemical pyrolysis of biomass, generating high-value-added pyrolysis products. This invention accelerates the pyrolysis rate, has high efficiency, and improves the utilization rate of biomass. However, electrocatalysis requires the use of anode and cathode electrodes, inevitably leading to electrode corrosion and equipment lifespan issues. CN 107760350 A discloses an active catalytic system obtained by mixing ionic liquid with magnetic additives as a reaction medium. By controlling the applied voltage, magnetic field strength, pyrolysis temperature, and reaction time of this reaction medium, the pyrolysis process of biomass is enhanced. This scheme utilizes the combined action of electric and magnetic fields to complete the catalytic reaction process, resulting in high pyrolysis efficiency, lower pyrolysis temperature, and high and singular product content. However, electric field catalysis also requires positive and negative electrodes, while magnetic field catalysis requires a large magnetic field strength (1-20T), resulting in high energy consumption, and has a small processing capacity and processing chamber, which is not conducive to industrial scale-up and production. Summary of the Invention

[0005] The main objective of this invention is to provide a system and method for enhancing liquid-phase biomass pyrolysis with a magnetically induced electric field, thereby overcoming the shortcomings of the prior art.

[0006] To achieve the aforementioned objectives, the technical solution adopted by this invention includes:

[0007] This invention provides a system for enhancing liquid-phase biomass pyrolysis with a magnetically induced electric field, comprising:

[0008] The pre-reaction unit includes a first reaction vessel and can provide first reaction conditions. The first reaction vessel is used to contain liquid biomass and can allow the liquid biomass to undergo a first pyrolysis reaction.

[0009] An enhanced reaction unit includes a second reaction vessel and can provide second reaction conditions. The second reaction vessel is connected to the first reaction vessel and can allow the liquid-phase biomass to undergo a second pyrolysis reaction.

[0010] Furthermore, the enhanced reaction unit further includes a magnetic circuit and an alternating or pulsed magnetic field generating component. The second reaction vessel includes at least one loop structure, which is disposed within the same magnetic circuit as the alternating or pulsed magnetic field generating component. The alternating or pulsed magnetic field generating component is used to provide an alternating or pulsed magnetic field. The liquid biomass flowing through the loop structure can induce a current within the alternating or pulsed magnetic field. The second pyrolysis reaction occurs based on the self-heating of the liquid biomass within the loop structure under the action of the current heating effect.

[0011] Another aspect of the present invention provides a method for enhancing liquid-phase biomass pyrolysis with a magnetically induced electric field, comprising:

[0012] Provides the aforementioned system for enhancing liquid-phase biomass pyrolysis using a magnetically induced electric field;

[0013] Reactants containing biomass are mixed in a first reaction vessel to form liquid biomass, and the liquid biomass undergoes a first pyrolysis reaction.

[0014] The liquid biomass after the first pyrolysis reaction is transported to the second reaction vessel, and an alternating or pulsed magnetic field is provided by an alternating or pulsed magnetic field generating component, so that the liquid biomass in the loop structure of the second reaction vessel is induced to form an induced electric field and an induced current in the alternating or pulsed magnetic field. The liquid biomass in the loop structure self-heats under the action of the current heating effect and undergoes a second pyrolysis reaction.

[0015] Compared with the prior art, the advantages of the present invention include:

[0016] 1) The present invention provides a system and method for enhancing liquid-phase biomass pyrolysis with magnetic induction electric field. It adopts electrothermal synergistic catalysis and uses a magnetic field as an excitation source to induce the reaction system to spontaneously generate an induced electric field and current, thereby avoiding the metal corrosion problem caused by direct contact between the electrode and the material in existing electrocatalysis technologies.

[0017] 2) The present invention provides a system and method for enhancing liquid-phase biomass pyrolysis with magnetic induction electric field. Under the electrothermal effect of magnetic induction electric field, the biomass pyrolysis reaction process is enhanced. The induced electric field accelerates the electron conduction of ionic liquid and biomass, improves the solubility and ion migration rate of biomass, reduces the pyrolysis reaction temperature, and significantly shortens the pyrolysis reaction time.

[0018] 2) The present invention provides a system and method for enhancing liquid-phase biomass pyrolysis with magnetic induction electric field, which avoids energy consumption in the heat transfer process of the medium and greatly improves the thermal energy utilization rate. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of a system for enhancing liquid-phase biomass pyrolysis with magnetic induction electric field, provided in a typical embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of the structure of a pre-reaction unit in a system for enhancing liquid-phase biomass pyrolysis with magnetic induction electric field, provided in a typical embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the structure of the enhanced reaction unit in a system for enhancing liquid-phase biomass pyrolysis using a magnetically induced electric field, provided in a typical embodiment of the present invention.

[0023] Figure 4 This is a top view of the enhanced reaction unit in a system for enhancing liquid-phase biomass pyrolysis using a magnetically induced electric field, provided in a typical embodiment of the present invention.

[0024] Figure 5 This is a front view of the enhanced reaction unit in a system for enhancing liquid-phase biomass pyrolysis using a magnetically induced electric field, provided in a typical embodiment of the present invention.

[0025] Figure 6 This is a schematic diagram of the magnetic core structure in a system for enhancing liquid-phase biomass pyrolysis using a magnetically induced electric field, provided in a typical embodiment of the present invention. Detailed Implementation

[0026] In view of the shortcomings of the prior art, the inventors of this invention, through long-term research and extensive practice, have proposed the technical solution of this invention. The following will further explain and illustrate this technical solution, its implementation process, and its principles.

[0027] This invention provides a system for enhancing liquid-phase biomass pyrolysis with a magnetically induced electric field, comprising:

[0028] The pre-reaction unit includes a first reaction vessel and can provide first reaction conditions. The first reaction vessel is used to contain liquid biomass and can allow the liquid biomass to undergo a first pyrolysis reaction.

[0029] An enhanced reaction unit includes a second reaction vessel and can provide second reaction conditions. The second reaction vessel is connected to the first reaction vessel and can allow the liquid-phase biomass to undergo a second pyrolysis reaction.

[0030] Furthermore, the enhanced reaction unit further includes a magnetic circuit and an alternating or pulsed magnetic field generating component. The second reaction vessel includes at least one loop structure, which is disposed within the same magnetic circuit as the alternating or pulsed magnetic field generating component. The alternating or pulsed magnetic field generating component is used to provide an alternating or pulsed magnetic field. The liquid biomass flowing through the loop structure can induce a current within the alternating or pulsed magnetic field. The second pyrolysis reaction occurs based on the self-heating of the liquid biomass within the loop structure under the action of the current heating effect.

[0031] Furthermore, the second reaction vessel includes at least two parallel loop structures, each loop structure including a magnetic coupling tube and a reaction enhancement tube connected end to end. The magnetic coupling tube is spirally wound on the magnetic loop, and the reaction enhancement tubes of the at least two loop structures are integrally arranged. In the induced electric field, the first induced current formed in the magnetic coupling tube is less than the second induced current formed in the reaction enhancement tube. In addition, the magnetic coupling tube is also connected to the liquid phase inlet, and the reaction enhancement tube is also connected to the liquid phase outlet.

[0032] Furthermore, the diameter of the reaction-enhancing tube is less than or equal to the diameter of the magnetic coupling tube.

[0033] Furthermore, the diameter of the reaction-enhancing tube is 5-30 mm, and the diameter of the magnetic coupling tube is 5-50 mm.

[0034] Furthermore, the magnetic circuit includes a closed annular magnetic core, and the alternating or pulsed magnetic field generating component includes an excitation coil wound on the annular magnetic core and electrically connected to a high-frequency excitation power supply.

[0035] Furthermore, the excitation coil has 1-5 turns, and the magnetic coupling tube in the second reaction vessel has a total of 20-50 turns.

[0036] Furthermore, the first reaction vessel is also connected to the liquid phase inlet and liquid phase outlet of the second reaction vessel, respectively, so that the liquid phase biomass can circulate between the first reaction vessel and the second reaction vessel.

[0037] Furthermore, the system for enhancing liquid biomass pyrolysis with magnetic induction electric field also includes a pumping device, which is connected to the first reaction vessel and the second reaction vessel and is used to drive the liquid biomass to circulate between the first reaction vessel and the second reaction vessel.

[0038] Another aspect of the present invention provides a method for enhancing liquid-phase biomass pyrolysis with a magnetically induced electric field, comprising:

[0039] Provides the aforementioned system for enhancing liquid-phase biomass pyrolysis using a magnetically induced electric field;

[0040] Reactants containing biomass are mixed in a first reaction vessel to form liquid biomass, and the liquid biomass undergoes a first pyrolysis reaction.

[0041] The liquid biomass after the first pyrolysis reaction is transported to the second reaction vessel, and an alternating or pulsed magnetic field is provided by an alternating or pulsed magnetic field generating component, so that the liquid biomass in the loop structure of the second reaction vessel is induced to form an induced electric field and an induced current in the alternating or pulsed magnetic field. The liquid biomass in the loop structure self-heats under the action of the current heating effect and undergoes a second pyrolysis reaction.

[0042] Furthermore, the method for enhancing liquid biomass pyrolysis with magnetic induction electric field includes: simultaneously flowing liquid biomass through at least two parallel loop structures, wherein the reaction enhancement tubes of the at least two parallel loop structures are integrally arranged, the temperature of the liquid biomass in the magnetic coupling tube of each loop structure is raised to a second temperature, the liquid biomass undergoes a first-stage pyrolysis reaction at the second temperature, the temperature of the liquid biomass in the reaction enhancement tube is raised to a third temperature, the liquid biomass undergoes a second-stage reaction at the third temperature, wherein the third temperature is greater than the second temperature.

[0043] Furthermore, the electric field strength of the induced electric field is 1000 V / cm-3000 V / cm, and the current density of the induced current is 0.5 A / cm. 2 -5 A / cm 2 .

[0044] Furthermore, the induced current formed within the magnetic coupling tube is 0-50A, and the current density is 0-5A / cm².2 The induced current generated inside the reaction-enhanced tube is 50-200A, and the current density is 5-20A / cm². 2 .

[0045] Furthermore, the second and third temperatures do not exceed 300°C.

[0046] Furthermore, the second pyrolysis reaction takes 20-100 minutes.

[0047] Furthermore, the method includes: inputting liquid biomass through a magnetic coupling tube and outputting it through a reaction enhancement tube.

[0048] Furthermore, the temperature of the first pyrolysis reaction is 50-400℃.

[0049] Furthermore, the method for enhancing liquid-phase biomass pyrolysis with magnetic induction electric field also includes: transporting the liquid-phase biomass after the second pyrolysis reaction back to the first reaction vessel, and repeating the first pyrolysis reaction and the second pyrolysis reaction two or more times in sequence.

[0050] The following will further explain the technical solution, its implementation process and principle in conjunction with the accompanying drawings and specific implementation examples. Unless otherwise specified, the PLC controller, pump, magnetic core, high-frequency excitation power supply, excitation coil, magnetic coupling tube, reaction enhancement tube, reaction vessel, stirring device, heating device and other components used in this invention are all known to those skilled in the art and can be obtained commercially. No specific product models or structures are limited here.

[0051] In a specific implementation plan, please refer to Figure 1 A device for enhancing liquid-phase biomass pyrolysis using a magnetic induction electric field includes a pre-reaction unit 100, a pumping device 200, an enhanced reaction unit 300, a high-frequency excitation power supply 400, and a PLC controller 500. The PLC controller 500 is connected to the pre-reaction unit 100, the pumping device 200, the enhanced reaction unit 300, and the high-frequency excitation power supply 400, and controls their operating states and parameters. The pre-reaction unit 100 is connected to the enhanced reaction unit 300 via the pumping device 200.

[0052] Specifically, the pre-reaction unit 100 is used to mix reactants containing biomass to form liquid biomass, and to supply the liquid biomass for a first pyrolysis reaction, which can be understood as a pre-reaction of the pyrolysis reaction.

[0053] Please refer to the following for details. Figure 2The pre-reaction unit 100 includes a first reaction vessel (which can be called a pyrolysis reaction vessel), a stirring device 103, and a jetting device 104. The first reaction vessel is provided with a first inlet A101, a first inlet B102, an automatic valve 105, and a discharge port 106. The first reaction vessel can be a reactor with a built-in heating device, etc., and its temperature can be controlled between 50℃ and 400℃. Its capacity is 5 L to 1000 L. The first inlet A101 and the second inlet B102 are used to add biomass and ionic liquid fillers into the first reaction vessel. The discharge port 106 is used for product collection and ionic liquid recovery. The stirring device 103 is used to stir and mix the biomass and ionic liquid fillers evenly. The jetting device 104 is used to supply the gases (O2, N2) required for the pyrolysis reaction into the first reaction vessel. The first reaction vessel is connected to a pumping device 200. The automatic valve 105 is installed on the pipeline connecting the first reaction vessel and the pumping device and is used to control the flow rate of liquid biomass entering the pumping device.

[0054] Specifically, the enhanced reaction unit 300 is used to cause the liquid-phase biomass after the first pyrolysis reaction to undergo a second pyrolysis reaction, which can also be understood as an enhanced reaction of the pyrolysis reaction.

[0055] Please refer to the following for details. Figures 3-6 The enhanced reaction unit 300 includes a second reaction vessel (which can be called a pyrolysis reaction enhanced vessel), a magnetic core 302, and an excitation coil 304. The magnetic core 302 is used to provide a magnetic circuit. The excitation coil 304 is spirally wound on the magnetic core 302 and electrically connected to a high-frequency excitation power supply 400 to provide an alternating or pulsed magnetic field. The second reaction vessel is connected to the first reaction vessel via a pumping device 200. A portion of the second reaction vessel is wound on the magnetic core 302 to form a loop structure. The liquid biomass in the loop structure can induce an electric field and an induced current in the alternating or pulsed magnetic field, thereby causing the liquid biomass in the loop structure to self-heat under the action of the current heating effect and undergo a second pyrolysis reaction.

[0056] Specifically, the second reaction vessel includes multiple magnetic coupling tubes 303 and multiple reaction enhancement tubes 305. The magnetic coupling tubes 303 are spirally wound on the magnetic core 302. Each reaction enhancement tube 305 is connected to at least two magnetic coupling tubes 303. The two ends of each magnetic coupling tube 303 are connected to a reaction enhancement tube 305 to form a loop structure. That is, each reaction enhancement tube 305 simultaneously serves as part of at least two loop structures. These multiple loop structures are arranged in parallel. The multiple magnetic coupling tubes 303 are connected to a liquid phase inlet 301, and the multiple reaction enhancement tubes 305 are connected to a liquid phase outlet 306. The liquid phase inlet 301 is connected to a pumping device 200. The liquid biomass output from the first reaction vessel can enter through the liquid phase inlet 301 and be simultaneously diverted to... The liquid biomass flows through multiple magnetic coupling tubes 303 and then through multiple reaction enhancement tubes 305, forming multiple liquid biomass loops within the second reaction vessel. The biomass is then output from the liquid outlet 306. The liquid biomass within each loop structure can induce an electric field and an induced current within the alternating or pulsed magnetic field. The induced current formed within the reaction enhancement tube 305 is greater than the induced current formed within the connected magnetic coupling tube 303, resulting in a higher temperature / energy of the liquid biomass within the reaction enhancement tube 305 compared to the connected magnetic coupling tube 303. Therefore, the liquid biomass can undergo a pre-enhanced reaction for the second pyrolysis reaction within the magnetic coupling tube 303 and an accelerated pyrolysis reaction for the second pyrolysis reaction within the reaction enhancement tube 305.

[0057] Specifically, the magnetic core 302 is a closed ring structure, with an outer diameter of 40 cm-150 cm, an inner diameter of 20 cm-120 cm, and a height of 20 cm-100 cm. The magnetic core 302 is made of amorphous nanocrystalline soft magnetic materials, etc.

[0058] Specifically, the magnetic field type achieved by the high-frequency excitation power supply 400 is an alternating magnetic field or a pulsed magnetic field. The excitation frequency of the high-frequency excitation power supply 400 is 30-70 kHz, the electric field strength of the induced electric field is 1000 V / cm-3000 V / cm, and the induced current density is 0.5 A / cm. 2 -5 A / cm 2 .

[0059] Specifically, the excitation coil 304 has 1-5 turns, the magnetic coupling tube 303 has a diameter of 5 mm-50 mm and a total number of 20-50 turns, the reaction enhancement tube 305 has a diameter of 5 mm-30 mm, and the diameter of the reaction enhancement tube 305 is less than or equal to the diameter of the magnetic coupling tube 303.

[0060] Specifically, the magnetic coupling tube 303 and the reaction strengthening tube 305 are made of materials such as quartz glass, silicone, high-purity polytetrafluoroethylene, PPL or PE, which are resistant to high temperature, high pressure and corrosion.

[0061] Specifically, the liquid phase outlet 306 of the second reaction vessel is also connected to the first reaction vessel, so that the liquid phase biomass can circulate between the first and second reaction vessels.

[0062] Specifically, the liquid biomass is mixed evenly in the first reaction vessel and undergoes the first pyrolysis reaction. Then, under the action of the pumping device 200, it enters the second reaction vessel and undergoes an enhanced and accelerated pyrolysis reaction, namely the second pyrolysis reaction, under the dual synergy of electrothermal and thermal (mainly the liquid biomass induces current in an alternating or pulsed magnetic field, and the liquid biomass self-heats under the thermal effect of the current). Then, the liquid biomass returns to the first reaction vessel under the action of the pumping device to complete one enhanced cycle. The time of the first and second pyrolysis reactions can be selected according to the characteristics of the pyrolysis reaction, and multiple cycles can be performed.

[0063] Specifically, the method for performing magnetically induction-electric field-enhanced liquid-phase biomass pyrolysis based on the aforementioned system may include the following steps:

[0064] Biomass powder, formed after pulverizing biomass, is mixed with ionic liquid in a mass ratio of 1:1 to 1:10 in a first reaction vessel. The mixed reaction system is then pumped into a second reaction vessel. Various types of biomass can be selectively pyrolyzed by adjusting the type of magnetic field, induced electric field strength, induced current density, reaction temperature, and reaction time provided by the enhanced reaction unit. Under the dual action of electrothermal action, the covalent bonds in the liquid biomass are selectively broken, achieving pyrolysis, liquefaction, gasification, or carbonization of the biomass, thereby rapidly generating target products such as biogas and biooil. Specifically, the induced electric field strength and induced current density are changed in real time, and the power supply and different material characteristics will also affect the induced electric field strength and induced current density.

[0065] Specifically, the biomass includes renewable and degradable biological materials such as wood, straw, starch, bark, cellulose, lignin, hemicellulose, protein, and chitin. The ionic liquid is an acidic electrolyte and / or an alkaline electrolyte and / or a molten salt electrolyte and / or a mixed solution composed of a catalyst in a certain proportion.

[0066] Specifically, the magnetic field provided by the enhanced reaction unit is an alternating magnetic field or a pulsed magnetic field, and the induced electric field strength generated within the enhanced reaction unit is 1000 V / cm-3000 V / cm, with an induced current density of 0.5 A / cm. 2-5 A / cm 2 Specifically, the induced current formed within the magnetic coupling tube 303 is 0-50A, and the current density is 0-5A / cm². 2 The induced current generated inside the reaction-enhanced tube 305 is 50-200A, and the current density is 5-20A / cm². 2 The reaction temperature can be set individually according to the pyrolysis situation; the reaction time of the second pyrolysis reaction is 20-100 min.

[0067] Specifically, this invention uses a changing magnetic field as an excitation source to induce an electric field and current within the ionic liquid and the molecules of the biomass itself to enhance the reaction process. This process does not require direct contact between the cathode and anode and the material, thus avoiding the metal corrosion problems caused by ionic liquids. Furthermore, this invention is the first to apply magnetic induction electric field technology to the enhancement of biomass pyrolysis reactions.

[0068] This invention provides a system and method for enhancing liquid-phase biomass pyrolysis using a magnetically induced electric field. It employs electrothermal synergistic catalysis, using a magnetic field as an excitation source to induce the spontaneous generation of an induced electric field and current in the reaction system. This magnetic field excitation source induces a non-contact electrocatalytic process, avoiding the metal corrosion problems caused by direct contact between electrodes and materials in existing electrocatalytic technologies. Furthermore, under the electrothermal effect of the magnetically induced electric field, this invention enhances the biomass pyrolysis reaction process. The induced electric field accelerates electron conduction between the ionic liquid and biomass, increasing the solubility and ion migration rate of biomass, reducing the pyrolysis reaction temperature, and significantly shortening the pyrolysis reaction time. Moreover, unlike conventional heating methods, the magnetically induced electric field induces the spontaneous generation of a thermal effect within the reactant molecules themselves, constituting a volumetric heating process. This avoids energy consumption during medium heat transfer, greatly improving thermal energy utilization. Additionally, this invention allows for the optimal control of the induced electric field strength, induced current density, pyrolysis temperature, and pyrolysis reaction time based on the characteristics of the biomass itself or the pyrolysis reaction, aiming to complete the pyrolysis process of biomass in the shortest time and with the lowest energy consumption, yielding high-quality target products.

[0069] The following will provide further explanation of the technical solution, its implementation process, and its principles, using specific implementation cases as examples.

[0070] Example 1: A method for enhancing liquid-phase biomass pyrolysis with a magnetically induced electric field, specifically including:

[0071] Using the invention provided as follows Figures 1-6The system shown is a magnetic induction electric field enhanced liquid-phase biomass pyrolysis system. It uses a first reaction vessel with a capacity of 10L, sets the number of turns of the excitation coil 304 to 2, uses a magnetic core 302 with an outer diameter of 50 cm, an inner diameter of 30 cm, and a height of 25 cm, uses a magnetic coupling tube with a diameter of 1.2 cm, sets the total number of turns of the magnetic coupling tube to 45, and uses a reaction enhancement tube with a diameter of 0.8 cm.

[0072] 3 kg of peanut shell powder and 6 kg of ionic liquid (molten salt Na2SO4) were added to the first reaction vessel respectively. The stirring device and jetting device matched with the first reaction vessel were turned on, N2 was introduced and the temperature of the first reaction vessel was set to be around 200℃ to carry out the preliminary reaction of biomass pyrolysis, namely the first pyrolysis reaction, the same below.

[0073] The liquid-phase reaction system in the first reaction vessel is pumped into the second reaction vessel. Once the liquid-phase reaction system has filled the entire magnetic coupling tube and reaction enhancement tube and is flowing back into the first reaction vessel, the high-frequency excitation power supply is turned on. The magnetic field type of the excitation source is selected as a pulsed magnetic field, resulting in an induced electric field strength of 1500 V / cm and an induced current density of 1 A / cm². 2 The reaction enhancement time is 80 min; the liquid phase reaction system will cause a temperature rise effect again when it enters the second reaction vessel from the first reaction vessel, but the pyrolysis temperature will not exceed 250℃; the generated volatile gases are collected from the feed port A or B under the carry of N2, some products are collected as liquid phase by condensation, and the generated residue and remaining ionic liquid are released from the discharge port of the first reaction vessel and recycled.

[0074] After the entire pyrolysis reaction is completed, the main gases produced are CH4 (9.6%), CO2 (82.1%), H2 (4.7%), and CO (2.6%); the main liquids are anisole (5.2%), 5-hydroxymethylfurfural (11.5%), and p-ethylphenol (7.3%).

[0075] Example 2: A method for enhancing liquid-phase biomass pyrolysis with a magnetically induced electric field, specifically including:

[0076] The system for enhancing liquid-phase biomass pyrolysis with magnetic induction electric field provided by this invention is configured with the following parameters: excitation coil with 2 turns; outer diameter of magnetic core with 80 cm; inner diameter with 50 cm; and height with 45 cm; magnetic coupling tube with 2 cm diameter and 60 turns; reaction enhancement tube with 1 cm diameter; and first reaction vessel with a capacity of 50 L.

[0077] 14 kg of wheat straw powder and 30 kg of ionic liquid (a mixture of 25 kg of ionic liquid [Bmim]Cl and 5 kg of FeCl3) were added to the first reaction vessel respectively. The stirring device and jet device of the first reaction vessel were turned on, N2 was introduced and the temperature of the first reaction vessel was set to be maintained at around 250°C to carry out the preliminary reaction of biomass pyrolysis.

[0078] The liquid-phase reaction system in the first reaction vessel is pumped into the second reaction vessel. Once the liquid-phase reaction system has filled the entire magnetic coupling tube and reaction enhancement tube and is flowing back into the first reaction vessel, the high-frequency excitation power supply is turned on. The magnetic field type of the excitation source is selected as a pulsed magnetic field, resulting in an induced electric field strength of 2000 V / cm and an induced current density of 1.5 A / cm². 2 The reaction enhancement time is 90 min; the liquid phase reaction system will cause a temperature rise effect again when it enters the second reaction vessel from the first reaction vessel, but the pyrolysis temperature will not exceed 300℃; the generated volatile gases are collected from the feed port A or B under the carry of N2, some products are collected as liquid phase by condensation, and the generated residue and remaining ionic liquid are released from the discharge port and recycled.

[0079] After the entire pyrolysis reaction is completed, the main gases produced are CH4 (11.5%), CO2 (79.8%), H2 (5.1%) and CO (3.6%); the main liquids are anisole (5.3%), 5-hydroxymethylfurfural (12.7%) and p-ethylphenol (8.4%).

[0080] Comparative Example 1:

[0081] The specific implementation method is the same as in Example 1, except that: Comparative Example 1 directly uses the first reaction vessel to carry out the entire pyrolysis reaction, and the specific operation steps are as follows:

[0082] 3 kg of peanut shell powder and 6 kg of ionic liquid (molten salt Na2SO4) were added to the first reaction vessel respectively. The stirring and jetting devices of the first reaction vessel were turned on, N2 was introduced, and the temperature of the first reaction vessel was set to about 250℃. The pyrolysis reaction was carried out for 80 min. The volatile gases produced were collected from the feed port A or B under the carry of N2. Some of the products were collected as liquid phase by condensation. The residue and the remaining ionic liquid were released from the discharge port and recycled.

[0083] After the entire pyrolysis reaction is completed, the main gases produced are CH4 (7.2%), CO2 (86.9%), H2 (2.7%), and CO (3.2%); the main liquids are anisole (4.1%), 5-hydroxymethylfurfural (9.8%), and p-ethylphenol (6.3%).

[0084] Comparative Example 2:

[0085] The specific implementation method is the same as in Example 2, except that: Comparative Example 2 directly uses the first reaction vessel, and the specific operation steps are as follows:

[0086] 14 kg of wheat straw powder and 30 kg of ionic liquid (a mixture of 25 kg of ionic liquid [Bmim]Cl and 5 kg of FeCl3) were added to the first reaction vessel. The stirring and jetting devices of the first reaction vessel were turned on, N2 was introduced, and the temperature of the first reaction vessel was set to about 300℃. The pyrolysis reaction was carried out for 90 min. The volatile gases produced were collected from the feed inlet A or B under the carry of N2. Some of the products were collected as liquid phase by condensation. The residue and the remaining ionic liquid were released from the discharge port and recycled.

[0087] After the entire pyrolysis reaction is completed, the main gases produced are CH4 (8.4%), CO2 (83.7%), H2 (3.9%) and CO (4.0%); the main liquids are anisole (3.9%), 5-hydroxymethylfurfural (10.5%) and p-ethylphenol (7.2%).

[0088] In summary, Examples 1 and 2, compared with Comparative Examples 1 and 2, respectively, demonstrate the advantages of the present invention in enhancing liquid-phase biomass pyrolysis with magnetic induction electric field. Compared with enhancement without magnetic induction electric field, the pyrolysis reaction enhancer of the present invention significantly increases the product content, that is, shortens the reaction time and improves energy utilization.

[0089] It should be understood that the above embodiments are merely illustrative of the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A system for enhancing liquid-phase biomass pyrolysis with a magnetically induced electric field, characterized in that, include: The pre-reaction unit includes a first reaction vessel and can provide first reaction conditions. The first reaction vessel is used to contain liquid biomass and can allow the liquid biomass to undergo a first pyrolysis reaction. The enhanced reaction unit includes a second reaction vessel and can provide a second reaction condition. The second reaction vessel is connected to the first reaction vessel and can allow the liquid biomass to undergo a second pyrolysis reaction. The first reaction vessel is also connected to the liquid inlet and liquid outlet of the second reaction vessel, respectively, so that the liquid biomass can circulate between the first reaction vessel and the second reaction vessel. Furthermore, the enhanced reaction unit further includes a magnetic circuit and an alternating or pulsed magnetic field generating component. The magnetic circuit includes a closed annular magnetic core, and the alternating or pulsed magnetic field generating component includes an excitation coil wound on the annular magnetic core and electrically connected to a high-frequency excitation power supply. The second reaction vessel includes at least two parallel loop structures. Each loop structure includes a magnetic coupling tube and a reaction enhancement tube connected end-to-end. The magnetic coupling tube is spirally wound on the magnetic circuit, and the reaction enhancement tubes of at least two loop structures are integrally arranged. In the induced electric field, the first induced current formed in the magnetic coupling tube is less than the second induced current formed in the reaction enhancement tube. The magnetic coupling tube is also connected to the liquid phase inlet, and the reaction enhancement tube is also connected to the liquid phase outlet. The loop structure and the alternating or pulsed magnetic field generating component are arranged in the same magnetic circuit. The alternating or pulsed magnetic field generating component is used to provide an alternating or pulsed magnetic field. The liquid biomass flowing through the loop structure can induce a current in the alternating or pulsed magnetic field. The second pyrolysis reaction occurs based on the self-heating of the liquid biomass in the loop structure under the action of the current heating effect.

2. The system for enhancing liquid-phase biomass pyrolysis with magnetic induction electric field according to claim 1, characterized in that: The diameter of the reaction-enhancing tube is less than or equal to the diameter of the magnetic coupling tube.

3. The system for enhancing liquid-phase biomass pyrolysis with magnetic induction electric field according to claim 2, characterized in that: The diameter of the reaction-enhancing tube is 5-30 mm, and the diameter of the magnetic coupling tube is 5-50 mm.

4. The system for enhancing liquid-phase biomass pyrolysis with magnetic induction electric field according to claim 1, characterized in that: The excitation coil has 1-5 turns, and the magnetic coupling tube in the second reaction vessel has a total of 20-50 turns.

5. The system for enhancing liquid-phase biomass pyrolysis with magnetic induction electric field according to claim 1, characterized in that: The system for enhancing liquid biomass pyrolysis with magnetic induction electric field also includes a pumping device connected to the first reaction vessel and the second reaction vessel, which is used to drive the liquid biomass to circulate between the first reaction vessel and the second reaction vessel.

6. A method for enhancing liquid-phase biomass pyrolysis with a magnetically induced electric field, characterized in that... include: A system for enhancing liquid-phase biomass pyrolysis with a magnetically induced electric field as described in any one of claims 1-5 is provided; Reactants containing biomass are mixed in a first reaction vessel to form liquid biomass, and the liquid biomass undergoes a first pyrolysis reaction. The liquid biomass after the first pyrolysis reaction is transported to the second reaction vessel, and an alternating or pulsed magnetic field is provided by an alternating or pulsed magnetic field generating component, so that the liquid biomass in the loop structure of the second reaction vessel is induced to form an induced electric field and an induced current in the alternating or pulsed magnetic field. The liquid biomass in the loop structure self-heats under the action of the current heating effect and undergoes a second pyrolysis reaction.

7. The method for enhancing liquid-phase biomass pyrolysis with magnetic induction electric field according to claim 6, characterized in that, include: Liquid biomass flows simultaneously through at least two parallel loop structures, with reaction enhancement tubes of the at least two parallel loop structures integrated together. The temperature of the liquid biomass in the magnetic coupling tube of each loop structure rises to a second temperature, where the liquid biomass undergoes a first-stage pyrolysis reaction. The temperature of the liquid biomass in the reaction enhancement tube rises to a third temperature, where the liquid biomass undergoes a second-stage reaction at the third temperature, which is higher than the second temperature.

8. The method for enhancing liquid-phase biomass pyrolysis with magnetic induction electric field according to claim 7, characterized in that: The electric field strength of the induced electric field is 1000 V / cm-3000 V / cm, and the current density of the induced current is 0.5 A / cm. 2 -5 A / cm 2 .

9. The method for enhancing liquid-phase biomass pyrolysis with magnetic induction electric field according to claim 7, characterized in that: The second and third temperatures do not exceed 300°C.

10. The method for enhancing liquid-phase biomass pyrolysis with magnetic induction electric field according to claim 7, characterized in that: The second pyrolysis reaction takes 20-100 minutes.

11. The method for enhancing liquid-phase biomass pyrolysis with magnetic induction electric field according to claim 7, characterized in that: The method includes: inputting liquid biomass through a magnetic coupling tube and outputting it through a reaction enhancement tube.

12. The method for enhancing liquid-phase biomass pyrolysis with magnetic induction electric field according to claim 6, characterized in that: The temperature of the first pyrolysis reaction is 50-400℃.

13. The method for enhancing liquid-phase biomass pyrolysis with magnetic induction electric field according to claim 6 or 7, characterized in that, Also includes: The liquid biomass after the second pyrolysis reaction is transported back to the first reaction vessel, and the first and second pyrolysis reactions are repeated more than twice.

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