Plasma reaction device for mechanically assisting catalyst fluidization

Abstract

The invention discloses a plasma reaction device for mechanically assisting catalyst fluidization. A reaction cavity of the plasma reaction device is composed of an inner medium tube, an outer medium tube, two ground electrodes and a high-voltage electrode, the first ground electrode, the outer dielectric tube, the high-voltage electrode, the inner dielectric tube and the second ground electrode are arranged from outside to inside to form a reaction cavity; a sealing device is arranged at a port of the outer medium pipe, and a motor in the sealing device is connected to a head port of the inner medium pipe through a transmission device to drive the inner medium pipe, the high-voltage electrode and the second ground electrode to rotate around a straight line where the central axes of the inner medium pipe, the high-voltage electrode and the second ground electrode are located; gas enters the inner medium pipe through the gas inlet hole in the sealing device and enters the reaction cavity, namely, the gas enters the inner medium pipe through the gas inlet hole, enters the cavity between the inner medium pipe and the outer medium pipe through the tail end of the inner medium pipe and finally flows out from the gas outlet hole in the head of the outer medium pipe. The gas treatment efficiency is improved, meanwhile, the problem that discharge is weakened due to the fact that the catalyst adheres to the wall is solved, and the energy utilization efficiency and the synergistic effect are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of plasma processing, and in particular to a plasma reaction device and method for mechanically assisted catalyst fluidization. Background Art

[0002] In the process of utilizing biomass energy, a harmful byproduct - tar - is produced. Tar is a complex mixture of polycyclic aromatic hydrocarbons that easily condenses into a black viscous substance, causing scaling, which in turn causes corrosion and blockage of equipment. Traditional tar treatment methods: physical removal and chemical removal. Physical removal methods include water washing, filtration, and electrostatic dust removal, but they can only partially remove tar and cause secondary pollution to the environment. Electrostatic dust removal is only effective for smaller liquid particles and is inconvenient to operate. The thermal cracking reaction in the chemical method requires the injection of oxygen and 1200 o The reaction conditions are extremely harsh at temperatures above 30 °C. Catalysts need to be added during catalytic cracking, which can produce high catalytic activity in a short time, but long-term reactions will lead to deactivation due to the production of coke, so the cost is high.

[0003] Plasma is a collection of a large number of particles such as electrons, atoms, molecules, active free radicals and excited species. The methods for generating plasma usually include dielectric barrier discharge, microwave discharge, sliding arc discharge and corona discharge. Among them, dielectric barrier discharge is to add an insulating medium between two metal electrodes. The gas molecules between the electrodes are ionized under the action of a strong electric field and eventually pass through the entire channel. Dielectric barrier discharge has the advantages of stable discharge, simple device and reaction at normal temperature and pressure. It is one of the widely used methods to form plasma. Summary of the invention

[0004] 1. Technical problems to be solved: In view of the above technical problems, the present invention provides a plasma reaction device for mechanically assisted catalyst fluidization, in which a motor is designed to drive the gear and the inner medium tube to rotate the rotating base, thereby scraping off the catalyst attached to the wall due to the siphon effect and electrostatic adsorption, so that the catalyst is refluidized; at the same time, the two blades of the rotating base and the inner wall of the outer medium tube are used to form an air flow channel to achieve a gas gathering effect, which is conducive to the catalyst reaching a higher floating height at the same flow rate. In addition, the device adopts a three-electrode structure to increase the processing area of ​​the gas under the same volume, thereby enhancing the processing effect and efficiency.

[0005] 2. Technical solution: A plasma reaction device for mechanically assisted catalyst fluidization, characterized in that: its reaction chamber is composed of inner and outer medium tubes, two ground electrodes and a high-voltage electrode which are coaxially sleeved; wherein the outer medium tube is in the shape of a long test tube, the first ground electrode is sleeved on the outer surface of the outer medium tube; the spiral high-voltage electrode is sleeved on the outer wall of the inner medium tube; the second ground electrode covers the inner wall of the inner medium tube; the first ground electrode, the second ground electrode, the high-voltage electrode and the inner and outer medium tubes are coaxially arranged, and a plasma reaction chamber is formed in the inner cavities of the inner and outer medium tubes between the two directly facing ground electrodes and the high-voltage electrode; the head end of the outer medium tube The opening of the inner medium tube is fixedly connected to the sealing device through a sealing fixing device; a motor and a wiring structure thereof are arranged in the sealing device; the output shaft of the motor is connected to the head port of the inner medium tube through a transmission device to drive the inner medium tube, the high-voltage electrode and the second ground electrode to rotate along a straight line where their central axes are located; when working, the gas to be treated enters the inner medium tube and enters the reaction chamber through the air inlet hole arranged in the sealing device, that is, enters the inner medium tube through the inner medium tube, enters the cavity between the inner and outer medium tubes through the tail end of the inner medium tube, and finally flows out from the air outlet hole arranged at the head of the outer medium tube.

[0006] Furthermore, a rotating base is also provided at the tail ends of the inner and outer medium tubes; the rotating base is fixed to the surface of the inner medium tube and can rotate with the rotation of the inner medium tube; the rotating base includes a cylindrical base, and the tail end of the inner medium tube is fixedly sleeved to the inner wall of the cylindrical base to achieve fixation; a plurality of L-shaped rotating blades are provided on the outer wall of the cylindrical base; the rotating blades include a connecting portion and a diverging portion connected to the cylindrical base; the diverging portions of the plurality of rotating blades are bud-shaped and can be wrapped around the outer wall of the inner medium tube and tightly attached to the inner wall of the outer medium tube, and when the rotating base rotates, the rotating blades can scrape off the attachments on the inner wall of the inner medium tube; the shape of the connecting portion connected to the bottom of the cylindrical base is hemispherical to adapt to the shape of the tail end of the outer medium tube, and can rotate tightly against the inner wall of the tail end of the outer medium tube; the cross-section of the diverging portion of the rotating blade is triangular, and the side of the triangle that fits the outer medium tube is arc-shaped.

[0007] Furthermore, the rotating base has six rotating blades.

[0008] Furthermore, the sealing device includes a sealing device body, an air inlet, a motor and a sealing device base; the motor is sealed and fixed to the sealing device body through a groove; the sealing device base is arranged at the bottom of the sealing device body and is fixedly connected to the external medium tube through a thread; the air inlet penetrates the sealing device body to the sealing device base and is connected to the inner cavity of the internal medium tube.

[0009] Furthermore, a first gear and a second gear are provided in the sealing device; the second gear is connected to the output shaft of the motor, and the first gear is meshed with the second gear; the first gear is sleeved on the end of the inner medium tube to drive the inner medium tube to rotate.

[0010] Furthermore, a bearing is arranged between the sealing device body and the sealing device base; the inner ring of the bearing is sleeved on the outer wall of the inner medium tube, and the outer ring of the bearing is fixedly connected to the sealing base so that the inner ring of the bearing rotates with the inner medium tube while the sealing base remains stationary.

[0011] Furthermore, the motor and its connecting wires are sealed in a sealing device.

[0012] Furthermore, the inner and outer medium tubes are both quartz tubes; the length of the outer medium tube is 160-240 mm, the outer diameter is 8-14 mm, and the wall thickness is 0.8-1.6 mm; the length of the inner medium tube is 160-240 mm, the outer diameter is 4-6 mm, and the wall thickness is 0.8-1.6 mm.

[0013] Furthermore, the high-voltage electrode is a high-voltage electrode made of stainless steel, copper or iron, with a spiral diameter of 5~7mm, a wire diameter of 1~2mm, a pitch of 2~7mm, a length of 60mm~120mm, and a distance from the inner wall of the outer dielectric tube to 6~14mm; the first ground electrode and the second ground electrode are both copper mesh or stainless steel mesh; the first ground electrode is 60mm~120mm long and 8mm~14mm in diameter; the second ground electrode is 60mm~120mm long, covering the inner wall of the inner dielectric tube, and 0~10mm away from the bottom end of the inner dielectric tube.

[0014] 3. Beneficial effects: (1) The method discloses a plasma reaction device for mechanically assisting catalyst fluidization, in which the motor drives the inner medium tube to rotate, thereby driving the rotating base to rotate; due to the unique structure of the blades of the rotating base, the catalyst adhering to the wall due to the siphon effect and electrostatic adsorption can be scraped off, so that the catalyst is refluidized. At the same time, when processing gas, the two adjacent blades of the rotating base and the inner wall of the outer medium tube form an air flow channel, so that the gas is gathered in the air flow channel, achieving the effect of gas gathering, which is conducive to the catalyst to achieve a completely fluidized state.

[0015] (2) The method discloses a plasma reaction device for mechanically assisted catalyst fluidization, which can not only realize dielectric barrier discharge treatment of gas, but also realize surface discharge treatment of gas. When the gas enters the space between the second ground electrode and the high-voltage electrode, surface discharge treatment is realized, and when the gas enters the space between the first ground electrode and the high-voltage electrode, dielectric barrier discharge treatment is realized, which effectively improves the gas treatment efficiency.

[0016] (3) The method discloses a plasma reaction device with mechanically assisted catalyst fluidization, which introduces gas into the reaction area through a closed space, thus avoiding gas leakage and pollution to the environment. Compared with the existing biomass tar treatment method, the use of a plasma device makes the treatment process simple and stable, reduces the temperature requirements, has lower requirements on the material of the device, and has stable operation. The catalyst is easy to replace and can be adjusted according to different needs. It has broad application prospects. In summary, the device adopts a design of two ground electrodes and one high-voltage electrode, which can increase the gas processing efficiency when the electrode length is the same; the device solves the problem of weakened discharge caused by catalyst adhesion to the wall, and significantly improves the energy utilization efficiency; the device can achieve a higher fluidization height of the catalyst at a lower flow rate, fully ensuring the contact between the catalyst and the plasma, while increasing the residence time of the reaction gas, which is beneficial to obtaining better reaction effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the overall external view of the device; Figure 2 This is an exploded view of the sealing device and its connecting parts in the device; Figure 3 An exploded view of the device showing the location of the reaction chamber in the device; Figure 4 is a structural diagram of a sealing device body in a specific embodiment; Figure 5 is a structural diagram of a sealing device base in a specific embodiment; Figure 6 is a structural diagram of the sealing and fixing device in the device; Figure 7 is a schematic diagram of a motor in the device; Figure 8 is a structural diagram of the bearing in the device; Fig. 9 This is a structural diagram of the inner medium pipe side of the rotating base in the device; Fig.10 This is a structural diagram of the side of the rotating base in the device that is attached to the external medium pipe; Explanation of the markings in the figures: Reaction chamber 1; high-voltage electrode 2; first ground electrode 3; external medium tube 4; internal medium tube 5; second ground electrode 6; sealing fixture 7; groove structure 701 of the sealing fixture; sealing device 8; sealing device base 801; groove 802; first gear 803; second gear 804; motor wire outlet 805; wire outlet hole 806 of the second ground electrode; high-voltage electrode lead-out interface 807; motor 9; air inlet 10; air outlet 11; rotating base 12; cylindrical base 1201 of the rotating base; rotating blades 1202 of the rotating base; thread 13; bearing 14. DETAILED DESCRIPTION

[0018] The present invention will be described in detail below with reference to the accompanying drawings.

[0019] As attached Figure 1 To Attachment Fig.10 As shown, a plasma reaction device for mechanically assisted catalyst fluidization is characterized in that: its reaction chamber 1 is composed of inner and outer medium tubes, two ground electrodes and a high-voltage electrode 2 which are sleeved with a common central axis; wherein the outer medium tube is in the shape of a long test tube, and the first ground electrode 3 is sleeved on the outer surface of the outer medium tube 4; the spiral high-voltage electrode is sleeved on the outer wall of the inner medium tube 5; the second ground electrode 6 covers the inner wall of the inner medium tube; the first ground electrode, the second ground electrode, the high-voltage electrode and the inner and outer medium tubes are coaxially arranged, and a plasma reaction chamber is formed in the inner cavities of the inner and outer medium tubes between the two ground electrodes and the high-voltage electrodes facing each other; the head of the outer medium tube The outer port is fixedly connected to the sealing device 8 through a sealing fixing device 7; a motor 9 and a wiring structure thereof are arranged in the sealing device; the output shaft of the motor is connected to the head port of the inner medium tube through a transmission device to drive the inner medium tube, the high-voltage electrode and the second ground electrode to rotate along a straight line where their central axes are located; when working, the gas to be treated enters the inner medium tube and enters the reaction chamber through the air inlet 10 arranged in the sealing device, that is, enters the inner medium tube through the inner medium tube, enters the cavity between the inner and outer medium tubes through the tail end of the inner medium tube, and finally flows out from the air outlet 11 arranged at the head of the outer medium tube.

[0020] Furthermore, as attached Fig. 9 , 10 As shown, a rotating base 12 is also provided at the tail end of the inner and outer medium tubes; the rotating base is fixed to the surface of the inner medium tube and can rotate with the rotation of the inner medium tube; the rotating base includes a cylindrical base 1201, and the tail end of the inner medium tube is fixedly sleeved to the inner wall of the cylindrical base to achieve fixation; a plurality of L-shaped rotating blades 1202 are provided on the outer wall of the cylindrical base; the rotating blades include a connecting portion and a diverging portion connected to the cylindrical base; the diverging portions of the plurality of rotating blades are bud-shaped and can be wrapped around the outer wall of the inner medium tube and tightly attached to the inner wall of the outer medium tube, and when the rotating base rotates, the rotating blades can scrape off the attachments on the inner wall of the inner medium tube; the shape of the connecting portion connected to the bottom of the cylindrical base is hemispherical to adapt to the shape of the tail end of the outer medium tube, and can rotate tightly against the inner wall of the tail end of the outer medium tube; the cross-section of the diverging portion of the rotating blade is triangular, and the side of the triangle fitted with the outer medium tube is arc-shaped.

[0021] Furthermore, the rotating base has six rotating blades.

[0022] Furthermore, as attached Figure 4 , 5As shown, the sealing device includes a sealing device body, an air inlet, a motor and a sealing device base 801; the motor is sealed and fixed to the sealing device body through a groove 802; the sealing device base is arranged at the bottom of the sealing device body and is fixedly connected to the external medium tube through a thread 13; the air inlet passes through the sealing device body to the sealing device base and is connected to the inner cavity of the internal medium tube.

[0023] Furthermore, a first gear 803 and a second gear 804 are also provided in the sealing device; the second gear is connected to the output shaft of the motor, and the first gear is meshed with the second gear; the first gear is sleeved on the end of the inner medium tube to drive the inner medium tube to rotate.

[0024] Furthermore, as attached Figure 8 As shown, a bearing 14 is also arranged between the sealing device base and the sealing fixing device; the inner ring of the bearing is sleeved on the outer wall of the inner medium tube, and the outer ring of the bearing is fixedly connected to the sealing base to realize that the inner ring of the bearing rotates with the inner medium tube while the sealing base remains stationary; the bottom of the bearing is fixed by a groove structure 701 arranged on the sealing fixing device.

[0025] Furthermore, the motor and its connecting wires are sealed in a sealing device.

[0026] Furthermore, the inner and outer medium tubes are both quartz tubes; the length of the outer medium tube is 160-240 mm, the outer diameter is 8-14 mm, and the wall thickness is 0.8-1.6 mm; the length of the inner medium tube is 160-240 mm, the outer diameter is 4-6 mm, and the wall thickness is 0.8-1.6 mm.

[0027] Furthermore, the high-voltage electrode is a high-voltage electrode made of stainless steel, copper or iron, with a spiral diameter of 5~7mm, a wire diameter of 1~2mm, a pitch of 2~7mm, a length of 60mm~120mm, and a distance from the inner wall of the outer dielectric tube to 6~14mm; the first ground electrode and the second ground electrode are both copper mesh or stainless steel mesh; the first ground electrode is 60mm~120mm long and 8mm~14mm in diameter; the second ground electrode is 60mm~120mm long, covering the inner wall of the inner dielectric tube, and 0~10mm away from the bottom end of the inner dielectric tube. Specific embodiment 1: This embodiment provides a structural diagram of a sealing device; as shown in the attached Figure 4 , 5 As shown, the body of the sealing device is hollow, and the motor and its wiring structure are sealed and fixed in the hollow; Figure 4802 is a groove adapted to the shape of the motor, which is used to fix the motor. 805 is the motor outlet, which is used to connect the motor to the outside for power supply. The sealing device is connected to the sealing device base through screws and their matching screw holes, and rubber sealing rings are added at the edges of the two to ensure isolation from the outside air. 806 in the figure is the outlet hole of the second ground electrode, which allows the second ground electrode to be grounded and keeps the outlet closed. Figure 5 In the figure, 806 is the connection port between the inner medium tube and the sealing device, and the sealing device is fixed as a whole by entering the corresponding screw holes of the sealing device through the three screw holes; 807 is the high-voltage electrode lead-out interface, and the high-voltage electrode is connected to the external high-voltage electricity through the bearing. The threads in the threaded sealing fixing device in the figure match to place the bearing between the two and fix them. Figure 4 and Figure 5 As shown, the main body and the base in the two figures are clamped together in a shape-adaptive manner, and the connected part of the two is sealed to form a sealing device. Specific embodiment 2: This embodiment is shown in the attached Figure 6 As shown, it is a sealing fixing device located between the sealing device and the inner and outer medium pipes; the thread in the upper figure cooperates with the thread of the sealing device base to fix the bearing in the middle of the sealing device base. The sealing device base cooperates with 701 in the figure to fix the bearing. Specific embodiment 3: As attached Fig. 9 , 10 As shown, the rotating base in this embodiment has 6 blades, and the figure is a structural diagram of the rotating base from two different perspectives. As shown in the attached figure, the rotating blade is divided into a connecting part and a diverging part; in this embodiment, the diverging part is at an angle of 15 to 30 degrees to the tangential direction of the base cylinder, and the cross section of the diverging part is triangular. With such an arc-shaped blade design, the bottom of the rotating base can scrape off the catalyst in the dead zone, so that the catalyst is concentrated in the dense airflow area; the diverging part is sleeved on the outside of the inner medium tube. When the inner medium tube rotates, it drives the rotating base to rotate synchronously, so that the catalyst is concentrated to the center, the number of catalysts in the dense airflow area is increased, and the number of catalysts fluidized at the same flow rate is increased. At the same time, the two adjacent blades are closely fitted with the outer medium tube, so that the two blades and the outer medium tube form an airflow channel, so that the gas can only flow out from the airflow channel between the 6 adjacent blades, so as to achieve the effect of gas gathering, and make the fluidization effect better at the same flow rate.

[0031] Although the present invention has been disclosed as above in terms of preferred embodiments, they are not intended to limit the present invention. Anyone skilled in the art can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection defined by the claims of this application.

Claims

1. A plasma reaction device with mechanically assisted catalyst fluidization, characterized in that: The reaction chamber is composed of inner and outer medium tubes, two ground electrodes and a high-voltage electrode which are sleeved with a common central axis; wherein the outer medium tube is in the shape of a long test tube, and the first ground electrode is sleeved on the outer surface of the outer medium tube; the spiral high-voltage electrode is sleeved on the outer wall of the inner medium tube; the second ground electrode covers the inner wall of the inner medium tube; the first ground electrode, the second ground electrode, the high-voltage electrode and the inner and outer medium tubes are coaxially arranged, and a plasma reaction chamber is formed in the inner cavity of the inner and outer medium tubes between the two opposite ground electrodes and the high-voltage electrode; the head port of the outer medium tube is fixedly connected to the sealing device through a sealing fixing device; a motor and a wiring structure thereof are arranged in the sealing device; the output shaft of the motor is connected to the head port of the inner medium tube through a transmission device to drive the inner medium tube, the high-voltage electrode and the second ground electrode to rotate along a straight line where the central axis thereof is located; when working, the gas to be treated enters the inner medium tube and enters the reaction chamber through the air inlet arranged in the sealing device, that is, enters the inner medium tube through the inner medium tube, enters the cavity between the inner and outer medium tubes through the tail end of the inner medium tube, and finally flows out from the air outlet arranged at the head of the outer medium tube.

2. The plasma reaction device for mechanically assisted catalyst fluidization according to claim 1, characterized in that: A rotating base is also provided at the tail end of the inner and outer medium tubes; the rotating base is fixed to the surface of the inner medium tube and can rotate with the rotation of the inner medium tube; the rotating base includes a cylindrical base, and the tail end of the inner medium tube is fixedly sleeved to the inner wall of the cylindrical base to achieve fixation; a plurality of L-shaped rotating blades are provided on the outer wall of the cylindrical base; the rotating blades include a connecting portion and a diverging portion connected to the cylindrical base; the diverging portions of the plurality of rotating blades are bud-shaped and can be wrapped around the outer wall of the inner medium tube and tightly attached to the inner wall of the outer medium tube, and when the rotating base rotates, the rotating blades can scrape off the attachments on the inner wall of the inner medium tube; the shape of the connecting portion connected to the bottom of the cylindrical base is hemispherical to adapt to the shape of the tail end of the outer medium tube, and can rotate tightly against the inner wall of the tail end of the outer medium tube; the cross-section of the diverging portion of the rotating blade is triangular, and the side of the triangle that fits the outer medium tube is arc-shaped.

3. The plasma reaction device with mechanically assisted catalyst fluidization according to claim 2, characterized in that: The rotating base has six rotating blades.

4. The plasma reaction device with mechanically assisted catalyst fluidization according to claim 1, characterized in that: The sealing device includes a sealing device body, an air inlet, a motor and a sealing device base; the motor is sealed and fixed to the sealing device body through a groove; the sealing device base is arranged at the bottom of the sealing device body and is fixedly connected to the external medium pipe through a thread; the air inlet penetrates the sealing device body to the sealing device base and is connected to the inner cavity of the internal medium pipe.

5. The plasma reaction device with mechanically assisted catalyst fluidization according to claim 4, characterized in that: A first gear and a second gear are also arranged in the sealing device; the second gear is connected to the output shaft of the motor, and the first gear is meshed with the second gear; the first gear is sleeved on the end of the inner medium tube to drive the inner medium tube to rotate.

6. The plasma reaction device with mechanically assisted catalyst fluidization according to claim 5, characterized in that: A bearing is also arranged between the sealing device base and the sealing fixing device; the inner ring of the bearing is sleeved on the outer wall of the inner medium tube, and the outer ring of the bearing is fixedly connected to the sealing base so that the inner ring of the bearing rotates with the inner medium tube while the sealing base remains stationary; the bottom of the bearing is fixed by a groove structure arranged on the sealing fixing device.

7. The plasma reaction device with mechanically assisted catalyst fluidization according to claim 4, characterized in that: The motor and its connecting wires are sealed in a sealing device.

8. The plasma reaction device with mechanically assisted catalyst fluidization according to claim 1, characterized in that: The inner and outer medium tubes are both quartz tubes; the outer medium tube has a length of 160-240 mm, an outer diameter of 8-14 mm, and a wall thickness of 0.8-1.6 mm; the inner medium tube has a length of 160-240 mm, an outer diameter of 4-6 mm, and a wall thickness of 0.8-1.6 mm.

9. The plasma reaction device with mechanically assisted catalyst fluidization according to claim 1, characterized in that: The high-voltage electrode is a high-voltage electrode made of stainless steel, copper or iron, with a spiral diameter of 5~7mm, a wire diameter of 1~2mm, a pitch of 2~7mm, a length of 60mm~120mm, and a distance of 6~14mm from the inner wall of the outer medium tube; the first ground electrode and the second ground electrode are both copper mesh or stainless steel mesh; the first ground electrode is 60mm~120mm long and 8mm~14mm in diameter; the second ground electrode is 60mm~120mm long, covering the inner wall of the inner medium tube, and 0~10mm away from the bottom end of the inner medium tube.

Images