Plasma thermocatalysis synergistic plastic degradation device

Abstract

The invention discloses a plasma thermocatalysis synergistic plastic degradation device, which belongs to the technical field of plastic degradation, and comprises a plasma reaction device, a potential adjusting device and a gas conveying device, the potential adjusting device and the gas conveying device are both connected with the plasma reaction device, and the gas conveying device is connected with the plasma reaction device. A first reaction cavity is formed in the plasma reaction device, the gas conveying device inputs gas into the first reaction cavity, and the potential adjusting device activates the gas in the first reaction cavity to a plasma state; a bearing net is arranged in the first reaction cavity and is used for bearing the adsorption unit and to-be-degraded plastic; the output end of the plasma reaction device is connected with a gas purification device, a second reaction cavity is formed in the gas purification device, the second reaction cavity and the first reaction cavity are mutually independent and communicated, and a catalyst is placed in the second reaction cavity. The method can prevent complex products from polluting the surface of the catalyst in the plastic degradation process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plastic degradation, in particular to a plasma thermal catalysis synergistic plastic degradation device. BACKGROUND

[0002] Plastics have become the main material in packaging, construction, electronic products and other industries due to their lightness, durability, low cost and other advantages. However, the popularity of difficult-to-degrade plastics has also brought serious environmental problems. In recent years, scientists and engineering and technical personnel have carried out various plastic degradation researches. At present, the main means of plastic degradation include physical degradation, chemical degradation, microbial degradation, etc. Among them, physical degradation usually destroys the structure of plastics through high temperature, ultraviolet light and other methods, but this method can only delay the degradation process of plastics and is difficult to completely solve the problem. Microbial degradation relies on microorganisms in nature to decompose plastics, although this method has potential in biodegradation, but for most traditional plastics, the degradation rate of microorganisms is slow and has not been universally applicable to all types of plastics. Chemical degradation includes pyrolysis, catalytic degradation and other methods, although it can accelerate the decomposition of plastics to some extent, but these processes usually require high energy consumption and specific conditions, which are difficult to engineer. Therefore, how to find an efficient and environmentally friendly plastic degradation method is still a major challenge in the field of environmental protection that needs to be solved.

[0003] In the prior art, a plastic degradation device of plasma is disclosed in Chinese patent document with publication number CN209508118U, which includes a reaction cavity, a high-voltage electrode, a ground electrode, a sinusoidal wave pulse power supply, a powder feeder and an Ar gas cylinder. The reaction cavity is loaded with a catalyst, Ar in the Ar gas cylinder is delivered into the reaction cavity by the powder feeder, then the potential difference between the ground electrode and the high-voltage electrode is controlled by adjusting the externally connected sinusoidal pulse power supply to excite high-energy electrons and ultraviolet radiation, which cooperates with the catalyst in the reaction cavity to degrade the plastic particles, thereby solving the problem of high energy consumption of the plastic degradation device in the device system. However, during the reaction of different plastics, a large amount of carbon deposition and oil mixture will cover the outer surface of the catalyst, thereby affecting its service life. Therefore, the use of the above device will bring problems of limited service life of the catalyst and difficulty in analyzing the reaction mechanism of the catalyst. SUMMARY

[0004] The present application aims to provide a plasma thermal catalysis synergistic plastic degradation device to solve the problem that in the prior art, a large amount of carbon deposition and oil mixture will cover the outer surface of the catalyst during the reaction of different plastics, thereby affecting its service life.

[0005] In order to achieve the above object, the application provides a kind of plasma thermal catalytic synergistic plastic degradation device, including plasma reaction device, electric potential adjusting device and gas delivery device, the electric potential adjusting device, gas delivery device are connected with plasma reaction device, first reaction cavity is provided in the plasma reaction device, gas delivery device inputs gas into first reaction cavity, the electric potential adjusting device activates the gas in first reaction cavity to plasma state;First reaction cavity is provided with bearing net, for carrying adsorption unit and plastic to be degraded;The output end of the plasma reaction device is connected with gas purification device, second reaction cavity is provided in the gas purification device, the second reaction cavity is independent and communicated with first reaction cavity, catalyst is placed in the second reaction cavity.

[0006] Through the above technical scheme, plasma reaction device and gas purification device are independent and connected with each other, on the one hand, it blocks the catalyst surface from being polluted by complex products in the plastic degradation process, on the other hand, the gas mixture generated by the plasma reaction device enters the gas purification device for purification, which can improve the selectivity of single gas product in the plastic degradation process and make the catalyst design more targeted.

[0007] Further, the input end of the plasma reaction device is provided with a sample feeder, the sample feeder includes a sample shell with two open ends, a front sample switch and a rear sample switch are sequentially arranged in the sample shell along the feeding direction, the front sample switch and the rear sample switch separate the inner cavity of the sample shell, and a material placing space is formed between the front sample switch and the rear sample switch when both the front sample switch and the rear sample switch are closed.

[0008] According to the above design, the double switches are designed to enable the device to continuously feed samples during the reaction. By opening the front sample switch first, the plastic waste to be reacted falls onto the upper end of the rear sample switch, then the front sample switch is closed, and then the rear sample switch is opened, so that the plastic waste falls onto the bearing net through the slope of the sample table. The double switches prevent gas from flowing out when the plastic waste is added. In addition, the height of the material placing space formed between the front sample switch and the rear sample switch is 20mm-50mm, which can provide enough space for the plastic waste.

[0009] Further, a sample table is fixedly arranged inside the sample feeder near the outlet, the outer periphery of the sample table is spaced apart from the inner wall of the sample shell, and the end of the sample table near the rear sample switch is provided with a tapered tip with a slope.

[0010] Through the above technical scheme, the top end of the sample table is triangular in shape, so that the plastic to be reacted can slide down to the ceramic net surface through the slopes on both sides. The space between the outer periphery of the sample table and the inner wall of the sample shell provides a sliding space for the plastic.

[0011] Further, the plasma reaction device is sequentially provided with an insulating sleeve layer and a first reaction tube from outside to inside, the outer periphery of the bearing net is embedded into the inner side of the first reaction tube; the gas purification device is sequentially provided with a second reaction tube, a heating layer and a heat preservation layer from inside to outside, the input end of the second reaction tube is sealingly connected with the output end of the first reaction tube; the inside of the second reaction tube is provided with a thermocouple sleeve, one end of the thermocouple sleeve is fixed at the outlet of the second reaction tube, the other end extends into the inside of the second reaction tube and a catalyst is placed at the top end.

[0012] The first reaction tube is wrapped with an insulating sleeve layer on the outside, which is used to block the influence of the medium in the environment on the plasma reaction device. The heating layer is tightly attached to the heat preservation layer on the outside, so as to reduce the temperature difference during the operation and heating of the device, and the heating layer can uniformly produce heat to avoid uneven heating of the catalyst.

[0013] Further, the second reaction tube is wrapped with a buffer heat preservation belt on the outside at the connection with the first reaction tube. The buffer heat preservation belt surrounds the outer ring of the fixed connection between the first reaction tube and the second reaction tube, which is used for buffering and heat preservation.

[0014] Further, the potential adjusting device includes a power supply, a driving electrode and a ground electrode, one end of the driving electrode extends into the inside of the first reaction tube, and the other end is connected with the power supply; one end of the ground electrode is connected with the outer wall of the first reaction tube, and the other end is connected with the power supply.

[0015] According to the above design, the power supply is used to adjust the potential difference between the driving electrode and the ground electrode, so as to excite a high-energy electric field. The end of the power supply away from the driving electrode is connected with an oscilloscope for displaying the value of the potential. The power supply can be a microsecond pulse power supply and a sine power supply, and is preferably a continuous microsecond pulse power supply.

[0016] Further, one end of the fixed column is connected to the position close to the output end in the inside of the first reaction tube, the other end of the fixed column abuts against the bottom side of the bearing net, and the fixed column is provided with a hollow hole along the axial direction; the driving electrode includes a metal rod, the metal rod extends into the hollow hole through the bearing net from the input end of the first reaction tube.

[0017] Through the above technical solution, the metal rod of the driving electrode is inserted into the fixed column for fixation, and the fixed column is made of insulating material without affecting the driving electrode. The inner diameter of the metal rod is 0.7-0.9 times of the hollow hole, which is convenient for the metal rod to be inserted into the hollow hole for fixation, and can avoid shaking of the metal rod in the hollow hole, thereby improving the connection stability of the metal rod.

[0018] Further, the gas delivery device comprises a gas cylinder, a switch A, a mass flow meter A and a pipeline A, the gas delivery device is connected with the sample injector through the pipeline A, the switch A and the mass flow meter A are both connected on the pipeline A, and the switch A is located in front of the mass flow meter A in the gas delivery direction.

[0019] Through the above technical scheme, the switch A is arranged on the pipeline A for controlling the delivery and closing of the gas, the mass flow meter is arranged on one side of the gas cylinder for adjusting the flow of the gas, the switch A is located in front of the mass flow meter A, the mass flow meter A is arranged away from the gas cylinder, so as to ensure that the flow meter can accurately measure the flow of the fluid without fluctuation, and avoid the interference of fluid disturbance and pressure fluctuation caused by the operation of the switch on the measurement. In addition, such design can also improve the protection, reliability and maintenance convenience of the flow meter, thereby improving the operation safety and measurement accuracy of the whole system.

[0020] Further, the sample injector is provided with an air inlet nozzle on the sample injection shell, the air inlet nozzle is located between the post-injection switch and the outlet of the sample injection shell, and the pipeline A is connected with the air inlet nozzle.

[0021] According to the above design, due to the double-switch design of the pre-injection switch and the post-injection switch, when the post-injection switch is opened to drop the material, the pre-injection switch remains closed, and the air inlet nozzle can keep the air inlet during the dropping of the material, thereby improving the plastic degradation efficiency.

[0022] Further, the output end of the gas purification device is connected with a product analysis device, the product analysis device comprises a control unit, a condensing tank and a gas analysis instrument, the control unit is electrically connected with the gas purification device, and the condensing tank is connected with the gas analysis instrument through a pipeline; the condensing tank is connected with the plasma reaction device through a pipeline B, and connected with the gas purification device through a pipeline C, and a switch B is installed on the pipeline B and the pipeline C.

[0023] Through the above technical scheme, the control unit can control the temperature rising reaction of the gas purification device, the pipeline B and the pipeline C respectively deliver the output gas in the plasma reaction device and the gas purification device to the condensing tank, and the switch B is used for adjusting the direction of the gas delivery. The condensing tank can make the high-temperature gas output by the gas purification reaction device to be cooled and condensed, and then delivered to the gas analysis instrument for analysis, so as to avoid the damage of the high-temperature gas to the gas analysis instrument.

[0024] Compared with the prior art, the technical scheme provided by the present application has the following advantages:

[0025] The application is a plasma thermal catalytic synergistic plastic degradation device. The electric potential adjusting device ionizes the gas in the first reaction chamber of the plasma reaction device to generate high-energy electrons to attack the plastic carried on the carrier net, and the plastic is degraded into mixed gas, liquid and solid. The solid is continuously reacted and isolated by the carrier net. The first reaction chamber and the second reaction chamber are independent and connected. The mixed gas generated by degradation reacts with the catalyst in the second reaction chamber of the gas purification device, and the oil mixture and carbon deposition generated by plastic degradation are adsorbed by the adsorption unit on the carrier net, and the carrier net can also isolate part of the solid impurities. The degradation process of the plastic and the reaction process of the mixed gas and the catalyst are in different and independent chambers, so that the oil mixture and carbon deposition generated by degradation will not contaminate the catalyst, and the catalytic efficiency and service life of the catalyst can be effectively improved. On the other hand, the gas mixture generated by the plasma reaction device is purified in the gas purification device, which can improve the selectivity of the plastic degradation process to single gas product, and also makes the design of the catalyst more targeted.

[0026] Obviously, the elements or features described in the above single embodiment can be used alone or in combination in other embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0027] In the drawings, the size and proportion do not represent the size and proportion of the actual product. The drawings are merely illustrative, and some unnecessary elements or features are omitted for clarity.

[0028] Figure 1 is a schematic diagram of the plasma thermal catalytic synergistic plastic degradation device of the embodiment of the application;

[0029] Figure 2 is a schematic diagram of the plasma reaction device in the embodiment of the application;

[0030] Figure 3 is a schematic diagram of the electric potential adjusting device in the embodiment of the application;

[0031] Figure 4 is a schematic diagram of the gas delivery device in the embodiment of the application;

[0032] Figure 5 is a schematic diagram of the gas purification device in the embodiment of the application;

[0033] Figure 6 is a schematic diagram of the product analysis device in the embodiment of the application.

[0034] BRIEF DESCRIPTION OF DRAWINGS

[0035] 1. Plasma reaction device; 11. Sample injector; 12. Pre-injection switch; 13. Post-injection switch; 14. Sample injection station; 15. Insulation sleeve; 16. First reaction tube; 17. Fixing column; 18. Carrier net; 19. Hollow channel; 111. Gas inlet nozzle; 2. Potential adjustment device; 21. Power supply; 22. Oscilloscope; 23. Driving electrode; 231. Wire A; 232. Metal rod; 24. Ground electrode; 241. Wire B; 242. Metal sheet; 3. Gas delivery device; 31. Gas cylinder; 32. Switch A; 33. Mass flowmeter A; 34. Pipeline A; 4. Gas purification device; 41. Second reaction tube; 42. Heating layer; 43. Thermocouple sleeve; 44. Insulation layer; 45. Buffer insulation belt; 5. Product analysis device; 51. Control unit; 52. Condensation tank; 53. Gas analysis instrument; 54. Pipeline B; 55. Switch B; 56. Pipeline C. DETAILED DESCRIPTION

[0036] The present invention will be described in detail below with reference to the accompanying drawings. What is described here is only a preferred embodiment of the present invention. Those skilled in the art can conceive of other ways to implement the present invention based on the preferred embodiment, and other ways also fall within the scope of the present invention.

[0037] See also Figure 1The plasma thermal catalytic synergistic plastic degradation device in the embodiment includes a plasma reaction device 1, a potential adjusting device 2, a gas conveying device 3, a gas purification device 4, and a product analysis device 5. The gas conveying device 3 and the potential adjusting device 2 are arranged on both sides of the plasma reaction device 1. The potential adjusting device 2 and the gas conveying device 3 are connected with the plasma reaction device 1. The plasma reaction device 1 is internally provided with a first reaction cavity. The gas conveying device 3 inputs gas into the first reaction cavity. The potential adjusting device 2 activates the gas in the first reaction cavity to a plasma state. The first reaction cavity is provided with a bearing net 18 for bearing an adsorption unit and plastic to be degraded. The lower end, i.e., the output end, of the plasma reaction device 1 is provided with the gas purification device 4. The gas purification device 4 is internally provided with a second reaction cavity. The second reaction cavity is independent of and in communication with the first reaction cavity. The second reaction cavity is placed with a catalyst. The upper and lower ends of the product analysis device 5 are connected with the upper and lower ends of the gas purification device 4, respectively. In the degradation process of plastic waste, the plastic waste and the adsorption unit are placed in the plasma reaction device 1. The gas conveying device 3 is started to convey gas into the plasma reaction device 1. The potential adjusting device 2 adjusts the potential to excite the gas into a high-energy plasma state, attacks the plastic to be tested carried on the bearing net 18, activates the plastic waste to be tested into solid, liquid, and mixed gas. The solid remains in the plasma reaction device 1 for continuous reaction. The liquid is absorbed by the adsorption unit and can be recycled for detection. The mixed gas enters the product analysis device 5 to analyze the gas species produced by the plasma reaction device 1. In addition, the catalyst is placed in the gas purification device 4. After the gas purification device 4 is started, the mixed gas enters the gas purification device 4 to selectively react with the catalyst to form a single valuable gas product.

[0038] As can be seen, the first reaction cavity and the second reaction cavity are independent of and in communication with each other. The mixed gas produced by degradation enters the second reaction cavity of the gas purification device 4 to react with the catalyst. The oily mixture and impurities such as carbon deposition produced by plastic degradation are adsorbed by the adsorption unit on the bearing net 18. At the same time, the bearing net 18 can also isolate part of the solid impurities. The degradation process of the plastic and the reaction process of the mixed gas and the catalyst are in different and independent reaction cavities. Therefore, the oily mixture and carbon deposition produced by degradation will not contaminate the catalyst, which can effectively improve the catalytic efficiency and service life of the catalyst. It should be noted that the adsorption unit uses quartz wool. The material of the bearing net 18 is ceramic, which presents a ceramic mesh structure. The gas flows through the gas purification device 4. Both quartz wool and ceramic have the advantage of high temperature resistance.

[0039] Referring to Figure 2The plasma reaction device 1 comprises a sample feeder 11, a pre-sample switch 12, a post-sample switch 13, a sample table 14, an insulating sleeve 15, a first reaction tube 16, a fixed column 17 and a bearing net 18. The first reaction tube 16 is wrapped with the insulating sleeve 15 outside to prevent the influence of the medium in the environment on the plasma reaction device 1. The fixed column 17 is fixedly connected to the end of the first reaction tube 16 away from the gas delivery device 3 and extends to the side of the plasma reaction device 1 close to the gas delivery device 3, with a length of about 40% to 60% of the first reaction tube 16. The bearing net 18 is placed at the top end of the fixed column 17 and is embeddedly connected to the inside of the first reaction tube 16 to place plastic waste. The end of the first reaction tube 16 away from the fixed column 17 is provided with the sample feeder 11. The sample feeder 11 comprises a sample shell with two open ends. The pre-sample switch 12 and the post-sample switch 13 are arranged in sequence along the feeding direction in the sample shell. The pre-sample switch 12 and the post-sample switch 13 separate the inner cavity of the sample shell. When the pre-sample switch 12 and the post-sample switch 13 are both closed, a sample space is formed between them. That is, as shown in Figure 2 The pre-sample switch 12, the post-sample switch 13 and the sample table 14 are arranged in sequence from top to bottom. During the plastic degradation reaction process, the pre-sample switch 12 and the post-sample switch 13 are opened, the quartz cotton is inserted into the bearing net 18, the plastic waste falls onto the sample table 14 and slides on the inclined surface thereof to the bearing net 18, and the pre-sample switch 12 and the post-sample switch 13 are closed to complete the sample loading. During the plastic degradation reaction process, if it is necessary to continue to load the sample, the pre-sample switch 12 is opened, the plastic waste falls between the pre-sample switch 12 and the post-sample switch 13, and the height therebetween is about 20mm to 50mm to enable the plastic waste to be placed sufficiently. The pre-sample switch 12 is closed and the post-sample switch 13 is opened to enable the plastic waste to continue to fall into the bearing net 18 through the sample table 14. The independently designed switches enable the plastic waste to be continuously loaded during the degradation process. In addition, the fixed column 17 further comprises a hollow hole 19 with an inner diameter of 4mm to 12mm and a height of 40mm to 180mm, which is designed to be connected to the electric potential adjusting device 2.

[0040] It should be noted that the first reaction tube 16 is a quartz tube, which is denoted as quartz tube A, and the fixed column 17 is a ceramic structure, which can be denoted as ceramic column.

[0041] Referring to Figure 3The potential adjusting device 2 comprises a high-voltage power supply 21, an oscilloscope 22, a driving electrode 23 and a ground electrode 24, wherein the driving electrode 23 comprises an electric wire A 231 and a metal rod 232 which are welded and fixed, and the ground electrode 24 comprises an electric wire B 241 and a metal sheet 242 which are welded and fixed; one end of the electric wire A 231 away from the metal rod 232 is fixedly connected with the high-voltage power supply 21, one end of the metal rod 232 away from the electric wire A 231 is inserted into the hollow hole 19 of the fixed column 17 through the bearing net 18, one end of the electric wire B 241 away from the metal sheet 242 is connected with the high-voltage power supply 21 on the same side of the electric wire A 231, and one end of the metal sheet 242 away from the electric wire B 241 is attached to the outer wall of the first reaction tube 16; one end of the high-voltage power supply 21 away from the driving electrode 23 is connected with the oscilloscope 22 for displaying the value of the potential; when the potential adjusting device 2 is started, the potential difference on the oscilloscope 22 is adjusted by starting the high-voltage power supply 21, so as to drive the metal sheet 242 to form a stable current and form a potential difference with the metal rod 232, wherein the metal sheet 242 can be replaced by a metal net, and the purpose is to form a stable and uniform current, the high-voltage power supply 21 can be a microsecond pulse power supply and a sine power supply, and preferably a continuous microsecond pulse power supply. The quartz tube A is between the ground electrode 24 and the driving electrode 23, so as to form a dielectric barrier to form a potential difference, and the quartz tube is used as a reaction tube for reaction while being used as a dielectric barrier. It should be noted that the driving electrode 23 is a high-voltage electrode, and the working voltage range is 0-50kV, which is mainly an electrode generating a potential difference with the ground electrode 24.

[0042] The thickness of the metal sheet 242 is 0.4mm-5mm, and the length of the metal sheet 242 is 100mm-400mm; the inner diameter of the metal rod 232 is 0.7-0.9 times of the hollow hole 19, the length of the metal rod 232 is 300mm-600mm, and the length of the metal rod 232 inserted into the fixed column 17 is 20mm-100mm, which is beneficial to the connection between the metal rod 232 and the fixed column 17.

[0043] Referring to Figure 4The gas delivery device 3 comprises a gas cylinder 31, a switch A 32, a mass flow meter A 33 and a pipeline A 34. The top end of the gas cylinder 31 is connected with the pipeline A 34, and is fixedly connected with one side of the plasma reaction device 1. Specifically, the gas inlet 111 is arranged on the sample inlet shell between the sample inlet switch 13 and the outlet of the sample inlet shell. The pipeline A 34 is connected with the gas inlet 111. The switch A 32 is arranged on the pipeline A 34, and is used for controlling the delivery and closing of the gas. The mass flow meter A 33 is arranged on the side of the switch A 32 away from the gas cylinder 31. The switch A 32 is designed before the mass flow meter A 33, so as to protect the mass flow meter A 33 from the impact of the gas. The gas can be air, nitrogen, argon, helium, hydrogen and oxygen, and is preferably hydrogen. All the gases can be excited to form plasma by electric current to generate heat energy to excite the high polymer to convert into small molecular substances.

[0044] Referring to Figure 5 The gas purification device 4 comprises a second reaction tube 41, a heating layer 42, a thermocouple sleeve 43, a heat preservation layer 44 and a buffer heat preservation belt 45. The outer layer of the middle part of the second reaction tube 41 is wrapped with the heating layer 42 on both sides. The height of the heating layer 42 accounts for 40% to 60% of the height of the second reaction tube 41. In order to effectively heat the area in the second reaction tube 41, the heating layer 42 is tightly attached to the heat preservation layer 44 outside. The thermocouple sleeve 43 is arranged in the second reaction tube 41 away from the first reaction tube 16. The top end of the thermocouple sleeve 43 can support and place the quartz wool. The quartz wool is used for placing the catalyst. After starting the heating program, the mixed gas generated by the plasma reaction device 1 enters the thermocouple sleeve 43 in the second reaction tube 41, and reacts with the catalyst to generate a single valuable gas. The buffer heat preservation belt 45 is arranged between the plasma reaction device 1 and the gas purification device 4, and is used for buffering and heat preservation. It should be noted that the second reaction tube 41 is a quartz tube, which is referred to as quartz tube B.

[0045] Referring to Figure 6The product analysis device 5 includes a control unit 51, a condensing tank 52, a gas analysis instrument 53, a switch B 55, a mass flow meter B, a pipeline B 54 and a pipeline C 56. Specifically, the control unit 51 is a computer, the gas analysis instrument 53 is a gas chromatograph-mass spectrometer instrument, the computer is connected to one side of the gas purification device 4 and connected to the internal electric box for controlling the programmed temperature reaction of the gas purification device 4, the condensing tank 52 is connected to the side away from the first reaction tube 16 of the thermowell 43 through the pipeline B 54, the pipeline B 54 extends along the direction of the second reaction tube 41 and is fixedly connected between the first reaction tube 16 and the second reaction tube 41 through the buffer insulation zone 45, used for conveying the gas released from the plasma reaction device 1, the side away from the thermowell 43 of the condensing tank 52 is connected with the gas chromatograph-mass spectrometer instrument, used for detecting the gas conveyed from the plasma reaction device 1 and the gas purification device 4, and the switch B 55 is arranged on the pipeline B 54, used for adjusting the direction of gas conveying. When the switch B 55 is opened, the mixed gas generated by the plasma reaction device 1 enters the gas chromatograph-mass spectrometer instrument through the condensing tank 52, and the types of the mixed gas product can be analyzed. When the switch B 55 of the pipeline B 54 is closed and the switch B 55 of the pipeline C 56 is opened, the temperature program of the computer is started, the mixed gas selectively reacts with the catalyst in the second reaction tube 41 to generate a single gas, the single gas flows to the condensing tank 52 through the pipeline C 56 for cooling, and then further enters the gas chromatograph-mass spectrometer instrument for analyzing the types of the product, so that the whole reaction program is completed.

[0046] The operation principle of the device is as follows: open the pre-injection switch 12 and the post-injection switch 13, pass the quartz wool and the plastic to be reacted through the injector 11 in sequence and drop onto the left and right inclined surfaces of the injection table 14, and then drop onto the bearing net 18 of the ceramic net surface structure, and close the pre-injection switch 12 and the post-injection switch 13; then, disassemble the quartz tube B, assemble after loading the quartz wool and the catalyst. Open the gas cylinder 31, adjust the gas flow rate, make the gas flow uniformly into the plasma reaction device 1, start the high-voltage power supply 21 in the electric potential adjusting device 2, activate the high-energy electrons generated by the flowing gas by adjusting the potential difference (displayed in the oscilloscope 22) between the driving electrode 23 and the ground electrode 24, attack the plastic to be tested to degrade the plastic into mixed gas, liquid and solid, the liquid is absorbed by the quartz wool, and the solid is subjected to continuous reaction. Open the switch B 55, the mixed gas can pass through the pipeline B 54 to the condensing tank 52 and then enter the gas chromatograph-mass spectrometer instrument, and the product generated by the plasma reaction device 1 is displayed. Close the switch B 55, start the computer program, the gas selectively reacts with the catalyst through the gas purification device 4, and then the generated product passes through the quartz tube B and then through the pipeline C 56 to the condensing tank 52 for condensation, enters the gas chromatograph-mass spectrometer instrument, and obtains the single valuable product subjected to the selective reaction of the catalyst.

[0047] In the description of the present application, it should be noted that the terms "front", "rear", "left", "right", "upper", "lower", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0048] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] The protection scope of the present application is only limited by the claims. Thanks to the teaching of the present application, those skilled in the art can easily recognize that alternative structures of the disclosed structures of the present application can be used as feasible alternative embodiments, and the disclosed embodiments of the present application can be combined to produce new embodiments, which also fall within the scope of the appended claims.

Claims

1. A plasma thermal catalytic synergistic plastic degradation device, comprising a plasma reaction device (1), a potential regulating device (2) and a gas conveying device (3), wherein the potential regulating device (2) and the gas conveying device (3) are both connected to the plasma reaction device (1), a first reaction chamber is provided in the plasma reaction device (1), the gas conveying device (3) inputs gas into the first reaction chamber, and the potential regulating device (2) activates the gas in the first reaction chamber to a plasma state; characterized in that A carrier net (18) is provided in the first reaction chamber for carrying the adsorption unit and the plastic to be degraded; the output end of the plasma reaction device (1) is connected to a gas purification device (4); a second reaction chamber is provided in the gas purification device (4); the second reaction chamber is independent of and communicates with the first reaction chamber; a catalyst is placed in the second reaction chamber.

2. The plasma thermal catalysis synergistic plastic degradation device according to claim 1, characterized in that: The input end of the plasma reaction device (1) is provided with an injector (11), the injector (11) comprising an injector housing with openings at both ends, a pre-injection switch (12) and a post-injection switch (13) sequentially arranged in the injector housing along the feeding direction, the pre-injection switch (12) and the post-injection switch (13) separating the inner cavity of the injector housing, and forming a material placement space between the pre-injection switch (12) and the post-injection switch (13) when both the pre-injection switch (12) and the post-injection switch (13) are closed.

3. The plasma thermal catalysis synergistic plastic degradation device according to claim 2, characterized in that: An injection platform (14) is fixedly provided inside the injector (11) near the outlet. The outer periphery of the injection platform (14) is spaced apart from the inner wall of the injection shell. The end of the injection platform (14) near the post-injection switch (13) is provided as a pointed end with a slope.

4. The plasma thermal catalysis synergistic plastic degradation device according to claim 1, characterized in that: The plasma reaction device (1) is provided with an insulating sleeve (15) and a first reaction tube (16) in sequence from the outside to the inside, and the outer periphery of the carrier net (18) is embedded in the inner side of the first reaction tube (16); the gas purification device (4) is provided with a second reaction tube (41), a heating layer (42) and a thermal insulation layer (44) in sequence from the inside to the outside, and the input end of the second reaction tube (41) is sealed and connected to the output end of the first reaction tube (16); a thermocouple sleeve (43) is provided inside the second reaction tube (41), one end of the thermocouple sleeve (43) is fixed at the outlet of the second reaction tube (41), and the other end extends into the interior of the second reaction tube (41), with a catalyst placed on the top end.

5. The plasma thermal catalysis synergistic plastic degradation device according to claim 4, characterized in that: The connection between the second reaction tube (41) and the first reaction tube (16) is covered with a buffer insulation belt (45) on the outside.

6. The plasma thermal catalysis synergistic plastic degradation device according to claim 4, characterized in that: The potential regulating device (2) comprises a power supply (21), a driving electrode (23) and a ground electrode (24); one end of the driving electrode (23) extends into the interior of the first reaction tube (16), and the other end is connected to the power supply (21); one end of the ground electrode (24) is connected to the outer wall of the first reaction tube (16), and the other end is connected to the power supply (21).

7. The plasma thermal catalysis synergistic plastic degradation device according to claim 6, characterized in that: One end of a fixed column (17) is connected to a position near the output end inside the first reaction tube (16), the other end of the fixed column (17) abuts the bottom side of the carrier net (18), and a hollow channel (19) is provided along the axial direction of the fixed column (17); the driving electrode (23) includes a metal rod (232), and the metal rod (232) extends from the input end of the first reaction tube (16) through the carrier net (18) and into the hollow channel (19).

8. The plasma thermal catalysis synergistic plastic degradation device according to claim 2, characterized in that: The gas delivery device (3) comprises a gas cylinder (31), a switch A (32), a mass flow meter A (33) and a pipeline A (34). The gas delivery device (3) is connected to the sample injector (11) via the pipeline A (34). The switch A (32) and the mass flow meter A (33) are both connected to the pipeline A (34). In the gas delivery direction, the switch A (32) is located in front of the mass flow meter A (33).

9. The plasma thermal catalysis synergistic plastic degradation device according to claim 8, characterized in that: The sample injector (11) is provided with an air inlet nozzle (111) on the sample injection housing. The air inlet nozzle (111) is located between the post-injection switch (13) and the outlet of the sample injection housing. The pipeline A (34) is connected to the air inlet nozzle (111).

10. The plasma thermal catalysis synergistic plastic degradation device according to claim 1, characterized in that: The output end of the gas purification device (4) is connected to a product analysis device (5), and the product analysis device (5) comprises a control unit (51), a condensation tank (52), and a gas analysis instrument (53). The control unit (51) is electrically connected to the gas purification device (4), and the condensation tank (52) is connected to the gas analysis instrument (53) via a pipeline. The condensation tank (52) is connected to the plasma reaction device (1) via a pipeline B (54), and the condensation tank (52) is connected to the gas purification device (4) via a pipeline C (56). A switch B (55) is installed on both the pipeline B (54) and the pipeline C (56).

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