Direct-current arc plasma cracking biomass liquid fuel device

Abstract

The invention relates to the technical field of biomass cracking, and discloses a direct-current arc plasma cracking biomass liquid fuel device which comprises a plasma generator, and the bottom of a reaction cavity is connected with a quenching cavity; the bottom of the reaction cavity is provided with a cracking product outlet communicated with the quenching cavity; a carrier gas conveying assembly is arranged on the upper portion of the outer end face of the plasma generator and used for conveying carrier gas into the plasma generator, a first water cooling assembly is arranged in the middle of the outer end of the plasma generator and used for cooling water circulation, and a magnetic control assembly is arranged on the lower portion of the outer end face of the plasma generator and used for controlling the magnetic field intensity. According to the device, the surrounding type electromagnetic coil is arranged on the periphery of the anode, the plasma beam is restrained by generating an axial or radial magnetic field, the whole plasma area is covered, and the shape and movement of plasma are effectively controlled under the condition that other arc working parameters are not changed; the instability of arc plasma is weakened through the arc stabilizing force of the external magnetic field.

Description

Technical Field

[0001] This invention relates to the field of biomass pyrolysis technology, specifically to a DC arc plasma pyrolysis device for biomass liquid fuel. Background Technology

[0002] In recent years, titanium metal, due to its low density, high strength, good ductility, and corrosion resistance, has shown broad application potential in aerospace, military equipment, and many key sectors of the national economy, earning it the reputation of being the "third metal" after aluminum and iron. The main industrial raw material for titanium materials is ilmenite, and the electric furnace smelting method is a mature and widely used enrichment process. This method is based on an electric arc furnace, where ilmenite is mixed with a reducing agent under high-temperature conditions to undergo a reduction reaction, yielding titanium-rich slag. During the smelting process, the high-temperature electric arc generated between the electrodes forms a DC arc plasma, possessing characteristics such as high temperature, high enthalpy, and high density of active particles. It particularly exhibits the unique advantages of high temperature and high energy density, making it outstanding in pyrolysis reactions and highly suitable for industrial processes requiring extreme thermodynamic conditions, such as titanium slag smelting, enabling efficient energy transfer and selective breaking of complex chemical bonds.

[0003] Currently, this process generally uses coke as a reducing agent, utilizing electrical energy to break down air and form an electric arc plasma, which promotes the reaction between ilmenite and the carbonaceous reducing agent. Although this method has good enrichment effect and high production efficiency, coke, as a non-renewable fossil energy source, releases a large amount of greenhouse gases such as carbon monoxide and carbon dioxide during the smelting process. In contrast, the pollution from nitrogen oxides, sulfur dioxide, and soot produced by the combustion of biomass liquid fuels is significantly reduced, and it may even have the potential to achieve zero or negative carbon emissions.

[0004] Plasma pyrolysis technology can significantly improve the reaction rate of biomass gasification and initiate a series of complex chemical reactions that are difficult to occur under conventional conditions under plasma activation, thereby generating high-grade syngas mainly composed of H2 and CO. This technology not only helps to improve the yield and quality of syngas but also effectively suppresses the formation of coke and tar during pyrolysis. However, current research on the ionization process, discharge characteristics, and key influencing factors inside the reactor during DC arc plasma pyrolysis of biomass liquid fuels is still insufficient. Furthermore, while existing plasma generators come in various structural forms, they generally suffer from high parameters, large size, and poor versatility, and are mostly fixed to specific application scenarios, making it difficult to adapt to the specific process requirements of efficient biomass liquid fuel pyrolysis. In addition, the arc root attachment position often fluctuates significantly on the anode surface of the plasma generator, leading to severe instability of the plasma jet. This not only directly reduces the operational reliability of the arc plasma generator but also makes it difficult to accurately control the key plasma parameters of the jet, becoming a key bottleneck restricting the development and industrial application of this technology. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a DC arc plasma pyrolysis biomass liquid fuel device, which has advantages such as improved pyrolysis efficiency, energy utilization rate, and product selectivity, thus solving the aforementioned technical problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a DC arc plasma pyrolysis biomass liquid fuel device, comprising a plasma generator, wherein the bottom of the plasma generator is connected to a reaction chamber, and the bottom of the reaction chamber is connected to a quenching chamber; The plasma generator is provided with a plasma jet outlet at its bottom that connects to the reaction chamber. The bottom of the reaction chamber is provided with a pyrolysis product outlet that connects to the quenching chamber. The upper part of the outer end face of the plasma generator is provided with a carrier gas delivery component for delivering carrier gas into the plasma generator. The middle part of the outer end of the plasma generator is provided with a first water cooling component for cooling water circulation. The lower part of the outer end face of the plasma generator is provided with a magnetic control component for controlling the magnetic field strength. The upper part of the reaction chamber is provided with a feeding assembly for conveying the materials participating in the pyrolysis, and the middle part of the reaction chamber is provided with a second water cooling assembly. The quenching chamber is equipped with a quenching component in the middle to cool the pyrolysis products.

[0007] As a preferred embodiment of the present invention, the plasma generator includes a cathode, an anode, and an insulating layer. The anode has a sleeve structure, and an insulating layer is fixedly disposed between the cathode and the anode. The bottom of the cathode is pointed.

[0008] As a preferred embodiment of the present invention, the carrier gas delivery assembly includes a carrier gas inlet and a carrier gas input pipe. The carrier gas inlet is located on the side of the anode, and the carrier gas input pipe connects to the interior of the anode along the carrier gas inlet. A plasma jet outlet is provided at the bottom of the anode, and the generated plasma jet is injected into the reaction chamber through the plasma jet outlet.

[0009] As a preferred embodiment of the present invention, the magnetic control assembly includes an excitation coil, which is wound in a ring shape and fixed to the outside of the anode.

[0010] As a preferred technical solution of the present invention, the first water-cooling component includes a first water-cooling tank, a first cooling water input pipe, a first cooling water inlet, a first cooling water output pipe, and a first cooling water outlet. The anode has a first water-cooling tank inside, and the anode has a first cooling water inlet and a first cooling water outlet on both sides. The first cooling water input pipe and the first cooling water output pipe are respectively connected to the first water-cooling tank along the first cooling water inlet and the first cooling water outlet.

[0011] As a preferred embodiment of the present invention, the feeding assembly includes an annular atomizing nozzle disposed on one side of the outer end face of the reaction chamber. The injection hole at the output end of the atomizing nozzle is connected to a gas conduit, and a nozzle disposed at the output end of the gas conduit is connected to the reaction chamber. The atomizing nozzle is connected to a feeding pipe for conveying biomass liquid fuel.

[0012] As a preferred embodiment of the present invention, a quartz glass tube window is embedded and installed on one side of the reaction chamber.

[0013] As a preferred embodiment of the present invention, the second water-cooling assembly includes a second water-cooling tank, a second cooling water input pipe, a second cooling water inlet, a second cooling water output pipe, and a second cooling water outlet. The reaction chamber is provided with an annular second water-cooling tank. The second cooling water inlet is located at the bottom of the outer end of the reaction chamber and corresponds to the second water-cooling tank. The second cooling water outlet is located at the top of the outer end of the reaction chamber and corresponds to the second water-cooling tank. The second cooling water input pipe and the second cooling water output pipe are respectively connected to the second water-cooling tank through the second cooling water inlet and the second cooling water outlet.

[0014] As a preferred embodiment of the present invention, the quenching assembly includes an outer wall, injection holes, a quenching water spray pipe, a pyrolysis gas outlet, and a polytetrafluoroethylene (PTFE) pipeline. The outer wall is connected to the bottom of the reaction chamber. Six injection holes are symmetrically arranged inside the outer wall. The quenching water spray pipe is connected to each injection hole to inject quenching water medium into the quenching chamber. A pyrolysis gas outlet is provided at the bottom of the quenching chamber, and the PTFE pipeline is connected to the pyrolysis gas outlet.

[0015] Compared with the prior art, the present invention provides a DC arc plasma pyrolysis biomass liquid fuel device, which has the following beneficial effects: 1. This invention controls the arc discharge between the cathode (tungsten) and anode (copper) using a DC power supply, and precisely adjusts the carrier gas flow rate with a mass flow meter. It utilizes the ionization of inert gas to generate a high-temperature, high-enthalpy plasma jet, providing a high-energy-density and high-reactivity environment for the pyrolysis of biomass liquid fuels. At the same time, by setting up a surrounding electromagnetic coil around the anode, an axial or radial magnetic field is generated to constrain the plasma beam and cover the entire plasma region. This effectively controls the shape and movement of the plasma without changing other arc operating parameters, and the external magnetic field reduces the instability of the arc plasma.

[0016] 2. This invention utilizes an integrated annular atomizing nozzle, formed by the feed inlet and inner wall of the reaction chamber, to achieve gas-assisted atomization of biomass liquid fuel. This structure atomizes the fuel into micron-sized droplets, significantly increasing its total surface area. This allows for rapid and complete pyrolysis under the high-temperature plasma environment, greatly improving the reaction rate and feedstock conversion efficiency. Simultaneously, uniform feeding helps maintain the stability of the plasma torch, and the atomization effect, combined with the scouring effect of the gas, effectively suppresses coking and carbon buildup of biomass liquid fuel at the feed inlet or reaction chamber wall, ensuring long-term stable operation of the system. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a side view of the present invention; Figure 4 This is a schematic diagram of the feed pipe structure of the present invention.

[0018] The components are as follows: 1. Plasma generator; 2. Reaction chamber; 3. Quenching chamber; 4. Cathode; 5. Anode; 6. Insulating layer; 7. First water-cooling tank; 8. First cooling water input pipe; 9. First cooling water inlet; 10. First cooling water output pipe; 11. First cooling water outlet; 12. Carrier gas inlet; 13. Carrier gas input pipe; 14. Plasma jet outlet; 15. Outer wall of reaction chamber; 16. Second water-cooling tank; 17. Second cooling water input pipe; 18. Second cooling water inlet; 19. Second cooling water output pipe; 20. Second cooling water outlet; 21. Atomizing nozzle; 22. Feed pipe; 23. Pyrolysis product outlet; 24. Monitoring equipment; 25. Outer wall; 26. Injection hole; 27. Quenching water nozzle; 28. Pyrolysis gas outlet; 29. ​​Polytetrafluoroethylene pipe; 30. Excitation coil; 31. Gas conduit; 32. Injection hole; 33. Nozzle; 34. Quartz glass tube window. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1-4 A DC arc plasma pyrolysis biomass liquid fuel device includes a plasma generator 1, a reaction chamber 2 connected to the bottom of the plasma generator 1, and a quenching chamber 3 connected to the bottom of the reaction chamber 2. The plasma generator 1 has a plasma jet outlet 14 at its bottom that connects to the reaction chamber 2; The bottom of reaction chamber 2 is provided with a cracking product outlet 23 that connects to quenching chamber 3; A carrier gas delivery assembly is provided on the upper part of the outer end face of the plasma generator 1 for delivering carrier gas into the plasma generator 1. A first water cooling assembly is provided in the middle of the outer end of the plasma generator 1 for circulating cooling water. A magnetocontrol assembly is provided on the lower part of the outer end face of the plasma generator 1 for controlling the magnetic field strength. The upper part of the reaction chamber 2 is equipped with a feeding assembly for conveying the materials participating in the pyrolysis, and the middle part of the reaction chamber 2 is equipped with a second water cooling assembly. Quenching chamber 3 is equipped with a quenching component in the middle to cool the pyrolysis products.

[0021] The plasma generator 1 includes a cathode 4, an anode 5, and an insulating layer 6. The anode 5 has a sleeve structure. The insulating layer 6 is fixedly disposed between the cathode 4 and the anode 5. The bottom of the cathode 4 is pointed. The cathode 4 is made of tungsten material and its bottom is pointed. The anode 5 is made of copper material and has a sleeve structure. The distance between the tip of the cathode 4 and the inner surface of the anode 5 is adjustable, with a minimum distance of 6 mm. The insulating layer 6 is made of polytetrafluoroethylene material and has a thickness of 2 mm. It is disposed between the cathode 4 and the anode 5 to prevent the two electrodes from directly contacting each other.

[0022] The carrier gas delivery assembly includes a carrier gas inlet 12 and a carrier gas input pipe 13. The carrier gas inlet 12 is located on the side of the anode, and the carrier gas input pipe 13 connects to the interior of the anode 5 along the carrier gas inlet 12. A plasma jet outlet 14 is provided at the bottom of the anode 5, and the generated plasma jet is injected into the reaction chamber 2 through the plasma jet outlet 14.

[0023] The magnetic control assembly includes an excitation coil 30, which is wound in a ring around the outside of the anode 5 and connected to an external excitation power supply. The magnetic field strength is controlled by adjusting the power supply parameters.

[0024] The cathode 4 is connected to the negative terminal of the DC power supply via a cable, and the anode 5 is connected to the positive terminal of the DC power supply via a cable. The first water-cooling assembly includes a first water-cooling tank 7, a first cooling water inlet pipe 8, a first cooling water inlet 9, a first cooling water outlet pipe 10, and a first cooling water outlet 11. The anode 5 has a first water-cooling tank 7 inside, and the anode 5 has a first cooling water inlet 9 and a first cooling water outlet 11 on both sides. The first cooling water inlet pipe 8 and the first cooling water outlet pipe 10 are connected to the first water-cooling tank 7 along the first cooling water inlet 9 and the first cooling water outlet 11, respectively.

[0025] The feeding assembly includes an annular atomizing nozzle 21 on one side of the outer end face of the reaction chamber 2. The injection hole 32 at the output end of the atomizing nozzle 21 is connected to the gas conduit 31. The nozzle 33 at the output end of the gas conduit 31 is connected to the reaction chamber 2. The atomizing nozzle 21 is connected to the feeding pipe 22 for conveying biomass liquid fuel. An annular atomizing nozzle 21 integrally formed with the inner wall is provided on the upper left side of the reaction chamber 2. The biomass liquid fuel feeding pipe 22 is connected to the inlet. In order to reduce viscosity and increase fluidity, the fuel is first heated to about 90°C and then delivered to the annular atomizing nozzle 21 by an injection pump. The carrier gas is delivered to the gas conduit 31 in the annular atomizing nozzle. After the gas and liquid are mixed in the pipe, they are injected into the interior of the reaction chamber 2 by the nozzle 33 placed outside the pipe. A pyrolysis product outlet 23 is provided at the bottom of the reaction chamber 2. The pyrolysis products are output through the pyrolysis product outlet 23 and enter the quenching chamber 3 below. The carrier gas inlet 12, atomizing nozzle 21, first cooling water inlet 9, and second cooling water inlet 18 are all connected to an external monitoring device 24. This device is a customized visual industrial control device used to collect and output various parameters such as flow rate, pressure, temperature, current, and voltage, and transmit them to an external control computer. Based on the information obtained, combined with process requirements and safety requirements, the external control computer adjusts the control valves on the carrier gas input pipe 13, feed pipe 22, first cooling water input pipe 8, and second cooling water input pipe 17 in real time.

[0026] A quartz glass tube viewing window 34 is embedded and installed on one side of the reaction chamber 2; The reaction chamber 2 is hollow inside. The outer wall 15 of the reaction chamber adopts a composite structure of stainless steel shell and graphite liner. An annular second water-cooling groove 16 is set between the stainless steel shell and the graphite liner of the reaction chamber. The second water-cooling assembly includes the second water-cooling groove 16, the second cooling water input pipe 17, the second cooling water inlet 18, the second cooling water output pipe 19, and the second cooling water outlet 20. The annular second water-cooling groove 16 is opened inside the reaction chamber 2. The second cooling water inlet 18 is opened at the bottom of the outer end of the reaction chamber 2 and corresponds to the second water-cooling groove 16. The second cooling water outlet 20 is opened at the top of the outer end of the reaction chamber 2 and corresponds to the second water-cooling groove 16. The second cooling water input pipe 17 and the second cooling water output pipe 19 are respectively connected to the second water-cooling groove 16 through the second cooling water inlet 18 and the second cooling water outlet 20. The quenching assembly includes an outer wall 25, injection holes 26, a quenching water spray pipe 27, a pyrolysis gas outlet 28, and a polytetrafluoroethylene (PTFE) pipe 29. The outer wall 25 is connected to the bottom of the reaction chamber 2. Six injection holes 26 are symmetrically arranged inside the outer wall 25. The quenching water spray pipe 27 is connected to each injection hole 26 to spray quenching water medium into the quenching chamber 3. The bottom of the quenching chamber 3 is provided with a pyrolysis gas outlet 28, and the PTFE pipe 29 is connected to the pyrolysis gas outlet 28.

[0027] A DC power supply is used to power the cathode 4 and anode 5 via a cable, thereby inducing an electric arc discharge between them. Carrier gas is delivered to the plasma generator 1 through the carrier gas input pipe 13, and the mass flow meter and control valve at the carrier gas inlet 12 work together to regulate the gas flow rate. Cooling water is delivered to the first water-cooling tank 7 inside the anode through the first cooling water input pipe 8, and after absorbing heat, it is discharged through the first cooling water output pipe 10 to maintain the thermal stability of the electrode system. The excitation power supply is adjusted to control the excitation coil 30 to generate a stable arc magnetic field, so that the plasma jet is concentrated and stably ejected. The generated DC arc plasma jet is injected into the reaction chamber 2 through the plasma jet outlet 14. The heated biomass liquid fuel is transported to the annular atomizing nozzle 21 through the feed pipe 22. The inner diameter of the liquid inlet of the annular atomizing nozzle 21 is about 4 mm. The carrier gas is injected into the gas conduit 31 in the annular atomizing nozzle 21 from the lower end of the feed inlet. The inner diameter of the gas inlet of the annular atomizing nozzle 21 is about 2 mm. After the carrier gas enters the gas conduit 31, it is injected into the gas-liquid mixing chamber through multiple injection holes 32 of about 0.3 mm on the periphery of the conduit. It forms a gas-liquid two-phase flow with the biomass liquid fuel entering the mixing chamber through the liquid inlet, so as to achieve full mixing and atomization. Finally, the atomized mixture is sprayed into the core area of ​​the reaction chamber 2 through three nozzles 33 evenly distributed on the annular atomizing nozzle. The nozzles 33 are symmetrically arranged at a 120° interval, forming a uniform and stable atomization field in the reaction chamber. The reaction chamber 2 adopts a stainless steel-graphite composite structure, which fully utilizes the excellent high-temperature resistance and corrosion resistance of graphite material. It can effectively resist the high-temperature environment of plasma and the chemical erosion of pyrolysis products, thereby ensuring the long-term stable operation of the device under extreme conditions and maintaining the structural integrity of the main equipment, thus significantly improving the pyrolysis efficiency of biomass liquid fuel. The cooling water required by the water cooling system of the inner wall of the reaction chamber 2 is transported through the second cooling water inlet pipe 17. After the heat accumulates to the set temperature, it is output through the second cooling water outlet pipe 19. A mass flow meter is installed at the second cooling water inlet 18 to detect the cooling water flow rate. At the same time, a thermocouple is installed at the second cooling water outlet 20 to monitor the water temperature in real time and feed the monitoring data back to the control system. The flow rate is automatically adjusted through an electric regulating valve. The biomass liquid fuel transported into the reaction chamber 2 and the plasma jet generated by the plasma generator 1 undergo a pyrolysis reaction inside the reaction chamber 2. After pyrolysis, the products are output through the pyrolysis product outlet 23 to the lower quenching chamber 3, and then injected with cooling medium through six symmetrically arranged injection holes of about 1 mm inside to achieve rapid quenching, effectively suppressing secondary reactions and tar formation, and improving the selectivity and yield of target reducing gases (such as H2 and CO). The device achieves efficient pyrolysis and process optimization of biomass liquid fuel through multi-system coordinated control and real-time monitoring of key parameters, and has outstanding advantages such as high energy utilization, good product selectivity, and stable and reliable operation. It can realize real-time monitoring and data acquisition of electric arc morphology and dynamic process of interaction between plasma and biomass liquid fuel, providing a visualization means for subsequent research on pyrolysis mechanism and industrial optimization; By setting an annular water cooler in the anode 5 and the reaction chamber 2, a highly efficient thermal barrier area is constructed. The circulating cooling water continuously removes the heat accumulated in the heat-generating components, effectively blocking the high-temperature transmission path, thereby preventing thermal deformation and burn-out of components and ensuring long-term stable operation of the device.

[0028] This invention integrates water-cooled quenching, which allows the high-temperature pyrolysis gas to be rapidly cooled after leaving the reaction chamber. This effectively suppresses the secondary reactions of pyrolysis intermediates and the formation of tar, thereby ensuring the high selectivity of the target reducing gas (such as H2 and CO) and improving the quality of the syngas.

[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A DC arc plasma pyrolysis biomass liquid fuel device, characterized in that: It includes a plasma generator (1), the bottom of which is connected to a reaction chamber (2), and the bottom of the reaction chamber (2) is connected to a quenching chamber (3). The plasma generator (1) has a plasma jet outlet (14) at its bottom that connects to the reaction chamber (2). The bottom of the reaction chamber (2) is provided with a cracking product outlet (23) that connects to the quenching chamber (3); The plasma generator (1) has a carrier gas delivery assembly on the upper part of its outer end face for delivering carrier gas into the plasma generator (1), a first water cooling assembly on the middle part of the outer end face for circulating cooling water, and a magnetic control assembly on the lower part of the outer end face for controlling the magnetic field strength. The upper part of the reaction chamber (2) is provided with a feeding assembly for conveying the materials participating in the pyrolysis, and the middle part of the reaction chamber (2) is provided with a second water cooling assembly; The quenching chamber (3) is equipped with a quenching component in the middle to cool the pyrolysis products.

2. The DC arc plasma pyrolysis biomass liquid fuel device according to claim 1, characterized in that: The plasma generator (1) includes a cathode (4), an anode (5) and an insulating layer (6). The anode (5) has a sleeve structure. An insulating layer (6) is fixedly disposed between the cathode (4) and the anode (5). The bottom of the cathode (4) is pointed.

3. The DC arc plasma pyrolysis biomass liquid fuel device according to claim 2, characterized in that: The carrier gas delivery assembly includes a carrier gas inlet (12) and a carrier gas input pipe (13). The carrier gas inlet (12) is located on the side of the anode. The carrier gas input pipe (13) connects to the interior of the anode (5) along the carrier gas inlet (12). A plasma jet outlet (14) is provided at the bottom of the anode (5) to inject the generated plasma jet into the reaction chamber (2) through the plasma jet outlet (14).

4. The DC arc plasma pyrolysis biomass liquid fuel device according to claim 2, characterized in that: The magnetic control assembly includes an excitation coil (30), which is wound in a ring around and fixed to the outside of the anode (5).

5. The DC arc plasma pyrolysis biomass liquid fuel device according to claim 2, characterized in that: The first water-cooling assembly includes a first water-cooling tank (7), a first cooling water input pipe (8), a first cooling water inlet (9), a first cooling water output pipe (10), and a first cooling water outlet (11). The anode (5) has a first water-cooling tank (7) inside. The anode (5) has a first cooling water inlet (9) and a first cooling water outlet (11) on both sides. The first cooling water input pipe (8) and the first cooling water output pipe (10) are connected to the first water-cooling tank (7) along the first cooling water inlet (9) and the first cooling water outlet (11), respectively.

6. The DC arc plasma pyrolysis biomass liquid fuel device according to claim 1, characterized in that: The feeding assembly includes an annular atomizing nozzle (21) on one side of the outer end face of the reaction chamber (2). The injection hole (32) at the output end of the atomizing nozzle (21) is connected to the gas conduit (31). The nozzle (33) at the output end of the gas conduit (31) is connected to the reaction chamber (2). The atomizing nozzle (21) is connected to the feeding pipe (22) for conveying biomass liquid fuel.

7. The DC arc plasma pyrolysis biomass liquid fuel device according to claim 6, characterized in that: A quartz glass tube window (34) is embedded on one side of the reaction chamber (2).

8. The DC arc plasma pyrolysis biomass liquid fuel device according to claim 7, characterized in that: The second water-cooling assembly includes a second water-cooling tank (16), a second cooling water input pipe (17), a second cooling water inlet (18), a second cooling water output pipe (19), and a second cooling water outlet (20). The reaction chamber (2) is provided with an annular second water-cooling tank (16). The second cooling water inlet (18) is located at the bottom of the outer end of the reaction chamber (2) and corresponds to the second water-cooling tank (16). The second cooling water outlet (20) is located at the top of the outer end of the reaction chamber (2) and corresponds to the second water-cooling tank (16). The second cooling water input pipe (17) and the second cooling water output pipe (19) are respectively connected to the second water-cooling tank (16) through the second cooling water inlet (18) and the second cooling water outlet (20).

9. The DC arc plasma pyrolysis biomass liquid fuel device according to claim 1, characterized in that: The quenching assembly includes an outer wall (25), injection holes (26), a quenching water spray pipe (27), a pyrolysis gas outlet (28), and a polytetrafluoroethylene pipeline (29). The outer wall (25) is connected to the bottom of the reaction chamber (2). Six injection holes (26) are symmetrically arranged inside the outer wall (25). The quenching water spray pipe (27) is connected to each injection hole (26) to spray the quenching water medium into the quenching chamber (3). The bottom of the quenching chamber (3) is provided with a pyrolysis gas outlet (28), and the polytetrafluoroethylene pipeline (29) is connected to the pyrolysis gas outlet (28).

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