A plasma arc torch and method of using the same

Abstract

The invention discloses a plasma arc torch and a method for using the same, belonging to the technical field of plasma torches. The plasma arc torch comprises a furnace body, a crucible is arranged in the furnace body, a plasma arc torch is arranged on the side of the crucible, a feed port is arranged on the top of the furnace body, a feeding device is connected to the top of the feed port, a silo is connected to the top of the feeding device, the feeding device comprises a shell, the shell connects the feed port and the silo, circular rings are arranged at intervals in the shell, arc plates are fixed around the circular rings, and a motor for driving the circular rings to rotate is arranged outside the shell. The overall structure of the invention is simple, and it can realize automatic multiple feeding and adjust the feeding rate, and it has strong adaptability and reduces the processing cost.

Description

Technical Field

[0001] The invention relates to the technical field of plasma torches, and in particular to a plasma arc torch and a use method thereof. Background Art

[0002] Plasma technology has been widely used in the fields of machinery, metallurgy, materials, etc. The application of plasma technology in waste treatment is a new process developed in the past two decades.

[0003] Plasma waste treatment technology uses high-temperature thermal plasma generated by a plasma torch to quickly decompose and destroy waste. Organic matter is pyrolyzed into combustible small molecules, and inorganic matter is melted at high temperature to form glassy residues. This technology has the characteristics of fast reaction speed, low secondary pollution, and wide application range. It overcomes the shortcomings of traditional treatment technologies such as incineration and chemical treatment, such as large secondary pollution, complex processes, and selectivity for wastes. It is particularly suitable for the environmentally friendly treatment of special hazardous wastes such as waste resins, asbestos, and incineration fly ash.

[0004] The existing treatment methods usually use a transferred arc plasma torch to provide a high energy density and high temperature heating source for the atomization of metal raw materials, and at the same time cooperate with the position and structural setting characteristics of the ceramic funnel and the atomizing disk. Before each waste treatment, waste needs to be added to the smelting furnace. However, after the raw materials are added, they will be pyrolyzed to produce high-temperature gas and air pressure. Therefore, if they are added manually, they need to wait for cooling after the last treatment. If they are added automatically by mechanical devices, the manufacturing cost of the device needs to be increased and it is not easy to maintain.

[0005] The Korean invention patent with application number KR1020180139960 discloses a method for manufacturing nanopowders using DC medium arc plasma and a manufacturing device thereof. The manufacturing device can continuously mass-produce metal or silicon nanopowders by utilizing plasma heat energy to evaporate and condense the powder substrate and deposit the powder substrate. The invention also provides a method for manufacturing nanopowders using DC plasma arc, which can simplify the device for manufacturing nanopowders, thereby reducing the manufacturing cost of nanopowders. However, there is still room for technical improvement in the invention: the reactor is directly connected to the feed hopper set on its top, which requires multiple raw material additions and has low efficiency; the raw materials are prone to blockage when falling, and the raw materials may stick together and clump together, affecting the feeding rate and thus the waste treatment rate. Summary of the invention

[0006] The object of the present invention is to provide a plasma arc torch with high waste treatment efficiency and a method for using the same.

[0007] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0008] A plasma arc torch comprises a furnace body, a crucible is arranged in the furnace body, a plasma arc torch is arranged on the side of the crucible, a feed port is arranged on the top of the furnace body, a feeding device is connected to the top of the feeding port, and a material bin is connected to the top of the feeding device.

[0009] Preferably, the unloading device comprises a shell, the shell is connected to the feed port and the silo, circular rings are arranged in a transverse interval inside the shell, arc plates are fixed around the circular rings, and a motor for driving the circular rings to rotate is arranged outside the shell. The circular rings and the arc plates form a frame, and the motor can drive the frame to rotate inside the shell;

[0010] In the initial state, one of the arc plates of the frame is located at the upper position. At this time, the arc plate forms a seal between the silo and the shell. Waste accumulates in the silo and cannot fall down. When the waste needs to be processed, the motor is started, and the motor drives the frame to rotate, so that the arc plate above that blocks the waste leaves its original position, and the motor is turned off. At this time, the shell is connected to the silo, and the waste falls into the shell through the gap between adjacent arc plates, and finally reaches the furnace body to complete the unloading. After the unloading is completed, the motor is started again to make the other arc plate reach the upper position to seal the bottom of the silo. Through the above scheme, the operator can add all the waste to be processed in the silo at one time, and can realize batch unloading by controlling the motor without multiple additions, which improves efficiency and reduces labor costs.

[0011] Start the motor to make its driving end rotate continuously, and the arc plate intermittently closes the silo and the shell, so that the waste can intermittently enter the shell, which is helpful to prevent the risk of waste falling in a concentrated manner and causing blockage;

[0012] Different feeding methods can be realized by the two working states of the above motor, and the rate at which the waste finally enters the furnace body can be adjusted accordingly, which is conducive to adjusting the feeding according to the different particle sizes of the waste, thereby improving the overall adaptability of the device;

[0013] During the intermittent feeding process, the rotating arc plate can also stir the waste, promote the breaking up of the sticky raw materials, and increase the decomposition rate of the waste.

[0014] When the plasma arc torch is working, the temperature in the furnace increases and combustible gas is generated. The surrounding arc plate can form an annular guide for the combustible gas generated by thermal decomposition, which is beneficial to the discharge and collection of the combustible gas.

[0015] Preferably, an interface is provided at the top of the shell, and the bottom of the interface is arranged in cooperation with the arc plate. The top of the inner wall of the shell is provided with an interface downward, and the bottom of the interface is provided with an upward arc groove, which is arranged in cooperation with the outer wall surface of the arc plate, so that the arc plate can match the arc groove in the rotation path, ensuring that the arc plate closes the bottom of the silo, on the one hand to avoid leakage, and on the other hand to reduce the impact of the high temperature generated during decomposition on the waste in the silo.

[0016] Preferably, a rubber ring is provided at the bottom edge of the interface. The provision of the rubber ring improves the sealing of the interface and the arc plate, further reducing the impact of high temperature and high pressure on the waste in the silo. At the same time, there is vibration interference during the continuous driving process of the motor. The provision of the rubber ring reduces the wear of the interface and the arc plate during the engagement process and prevents rotation from getting stuck.

[0017] Preferably, a bracket is fixed on the inner side of the circular ring, the output shaft of the motor is connected to the bracket, cross bars arranged in an array are fixed between the brackets, and extension columns are arranged at intervals on the outer side of the cross bars, and the extension columns are rubber columns. The cross bars stabilize the connection between the brackets and the rotation path of the arc plate. When the circular plate rotates, the multiple cross bars are synchronously driven to move, and the waste falling from the silo can contact the multiple cross bars. On the one hand, the cross bars change the falling trajectory of the waste, so that the waste falls evenly in the shell and falls into the furnace body, which is beneficial to the stability of the pyrolysis reaction, and is also conducive to the stable production of combustible gas and molten material, thereby improving the efficiency and effect of waste treatment;

[0018] On the other hand, the cross bar can break up the agglomerated waste materials through the extension column to prevent the waste agglomerates from getting stuck in the feed port and forming a blockage, which would prevent the subsequent waste from being decomposed and affect efficiency.

[0019] Preferably, a feeding pipe is connected to the bottom of the shell, the feeding pipe is connected to the feed port, an upper baffle ring is fixed to the bottom of the inner wall of the feeding pipe, an annular plate is provided above the upper baffle ring, an inner tube is connected to the lower inner side of the annular plate, the inner tube is a flexible tube, and a spring is connected between the annular plate and the upper baffle ring.

[0020] Preferably, the top of the annular sheet extends upward into the shell, the top of the annular sheet is connected to a guide ring, the outer edge of the guide ring is bent upward and matched with the inner wall of the shell, and the bottom of the shell is provided with an air hole below the guide ring. The waste dispersed by the cross bar will fall on the guide ring. Since the end of the guide ring is bent upward, the waste will roll to the inside of the guide ring and pass through the inner tube under the action of gravity, and finally reach the furnace body, reducing the possibility that the waste will stay at the bottom of the shell and cannot be processed;

[0021] The waste material falls onto the guide ring through the base. The guide ring is pressed to drive the annular sheet and the inner tube to slide downward and squeeze the spring. The spring relies on the ability to restore deformation to make the guide ring slide up and down in the shell. On the one hand, it is helpful to prevent the metal waste material from adhering to the inner wall of the shell. On the other hand, the shaking guide ring accelerates the falling of the waste material and improves the reaction efficiency.

[0022] The high-temperature gas generated during the pyrolysis of waste will act upward on the inner tube and the annular sheet. Since the arc plate closes the upper end of the shell at this time, the air pressure inside the shell increases. At this time, the air pressure acts on the annular sheet to move upward and stretch the spring. At this time, since the gas continues to be generated, the annular sheet continues to pull the spring and drive the guide ring to slide in the shell, causing the space formed by the guide sheet and the shell to expand and compress, promoting the flow of air through the pores, which is beneficial to heat dissipation of components such as the shell and the guide ring, and improving the service life.

[0023] Compared with the prior art, the present invention has the following beneficial effects: the arc plate realizes the opening and closing of the material discharge passage, reduces the number of feeding times and improves efficiency; the rotatably arranged frame can realize a variety of material discharge methods and improves the adaptability of the device; the arc plate can guide the pyrolysis gas and improve the gas discharge and collection efficiency; the cross bar and the extension column break up the falling waste to prevent the waste from agglomerating and blocking the passage, thereby improving stability; the rotation of the cross bar can make the raw materials fall evenly into the furnace body, thereby improving the efficiency and stability of the pyrolysis reaction; the annular sheet slides relative to the shell through the spring, and cleans the inner wall of the shell through the guide ring to prevent the raw materials from sticking and affecting the passability; the sliding of the guide ring can promote the gas to flow from the pores, achieve heat dissipation, and improve the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0025] Figure 1 It is a cross-sectional schematic diagram of the present invention;

[0026] Figure 2 It is a cross-sectional schematic diagram of the material unloading device;

[0027] Figure 3 It is a schematic diagram of the ring and arc plate structure;

[0028] Figure 4 It is a schematic diagram of the position of the interface and the curved plate;

[0029] Figure 5 It is a schematic cross-sectional view of the feed pipe.

[0030] Figure numbers: furnace body 1; feed inlet 10; gas outlet 11; discharge port 12; air supply port 13; crucible 2; plasma torch 3; feeding device 4; shell 40; ring 41; arc plate 42; motor 43; interface 44; rubber ring 45; bracket 46; cross bar 47; extension column 48; silo 5; feeding pipe 6; upper baffle ring 60; annular sheet 61; inner tube 62; spring 63; guide ring 64; air hole 65; lower baffle ring 66; roller 67; connecting ring 68; flexible plate 69. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] The following first describes the concepts involved in the present application in conjunction with the accompanying drawings. It should be noted that the following description of each concept is only to make the content of the present application easier to understand, and does not limit the scope of protection of the present application; at the same time, the embodiments and features in the embodiments of the present application can be combined with each other in the absence of conflict. The present application will be described in detail with reference to the accompanying drawings and in conjunction with the embodiments.

[0033] See attached Figure 1 -Attached Figure 3 A plasma arc torch 3 comprises: a furnace body 1, a crucible 2 is arranged in the furnace body 1, a plasma arc torch 3 is arranged on the side of the crucible 2, a feed port 10 is arranged on the top of the furnace body 1, a feeding device 4 is connected to the top of the feeding port 10, and a silo 5 is connected to the top of the feeding device 4.

[0034] It should be noted that the furnace body 1 has a containing space, the containing space is communicated with the feed port 10, and the crucible 2 is arranged in the containing space;

[0035] The furnace body 1 is provided with a mounting hole, the mounting hole communicating the crucible 2 and the outside of the furnace body 1, the plasma arc torch 3 is assembled in the mounting hole, and the release end of the plasma arc torch 3 faces the inside of the crucible 2;

[0036] The furnace body 1 is also provided with a gas outlet 11, a material outlet 12 and an air supply port 13 connected to the accommodation space. The gas outlet 11 and the air supply port 13 are arranged above the crucible 2, and the material outlet 12 is arranged at the bottom of the crucible 2.

[0037] An induction coil is arranged in the discharge port 12 , and the induction coil is connected to a control power supply. A discharge pipe passing through the discharge port 12 is connected to the bottom of the crucible 2 .

[0038] First, the plasma arc torch 3 is started to preheat the temperature in the furnace body 1 to above 1200°C. After the waste is pretreated, it enters the furnace body 1 through the feed port 10, and the organic components are decomposed at high temperature to generate combustible gas, which is discharged from the gas outlet 11 and enters the subsequent combustion chamber;

[0039] The inorganic components are melted by the high temperature of plasma to become a flowable molten material. When discharge is required, the induction coil heats the discharge pipe. The molten material flows out of the heated discharge pipe and then cools and solidifies to form a stable glass product.

[0040] The air supply port 13 can be used to supply water vapor or a proper amount of oxygen to remove the pyrolysis coke generated by the pyrolysis of organic matter and generate combustible gas that enters the subsequent combustion chamber.

[0041] The unloading device 4 includes a housing 40, which is connected to the feed port 10 and the silo 5. Rings 41 are arranged in a horizontal interval in the housing 40, and arc plates 42 are fixed around the rings 41. A motor 43 for driving the rings 41 to rotate is arranged outside the housing 40. The rings 41 and the arc plates 42 form a frame, and the motor 43 can drive the frame to rotate in the housing 40;

[0042] In the initial state, one of the arc plates 42 of the frame is located at the upper position. At this time, the arc plate 42 forms a seal between the silo 5 and the shell 40. The waste accumulates in the silo 5 and cannot fall down. When the waste needs to be processed, the motor 43 is started. The motor 43 carries the frame to rotate, so that the arc plate above that blocks the waste leaves its original position, and the motor 43 is turned off. At this time, the shell 40 is connected with the silo 5, and the waste falls into the shell 40 through the gap between adjacent arc plates 42, and finally reaches the furnace body 1 to complete the unloading. After the unloading is completed, the motor 43 is started again to make the other arc plate 42 reach the upper position to block the bottom of the silo 5. Through the above scheme, the operator can add all the waste to be processed into the silo 5 at one time, and the unloading can be achieved in batches by controlling the motor 43, without the need for multiple additions, thereby improving efficiency and reducing labor costs.

[0043] The motor 43 is started to rotate its driving end continuously, and the arc plate 42 intermittently closes the silo 5 and the housing 40, that is, the waste material intermittently enters the housing 40, which is helpful to prevent the risk of waste material falling in a concentrated manner to form a blockage;

[0044] Different feeding methods are realized by the two working states of the motor 43, and the rate at which the waste finally enters the furnace body 1 can be adjusted accordingly, which is conducive to adjusting the feeding according to the different particle sizes of the waste, thereby improving the overall adaptability of the device;

[0045] During the intermittent feeding process, the rotating arc plate 42 can also stir the waste materials, promote the breaking up of the adhering raw materials, and increase the decomposition rate of the waste materials.

[0046] When the plasma arc torch 3 is working, the temperature in the furnace body 1 rises and combustible gas is generated. The surrounding arc plate 42 can form an annular guide for the combustible gas generated by thermal decomposition, which is beneficial to the discharge and collection of the combustible gas.

[0047] See attached Figure 4 The top of the shell 40 is provided with an interface 44, and the bottom of the interface 44 is arranged in cooperation with the arc plate 42. The top of the inner wall of the shell 40 is provided with the interface 44 downwardly, and the bottom of the interface 44 is provided with an upward arc groove, which is arranged in cooperation with the outer wall surface of the arc plate, so that the arc plate can match the arc groove in the rotation path, ensuring that the arc plate 42 closes the bottom of the silo 5, on the one hand to avoid leakage, and on the other hand to reduce the influence of the high temperature generated during decomposition on the waste in the silo 5.

[0048] A rubber ring 45 is provided at the bottom edge of the interface 44. The provision of the rubber ring 45 improves the sealing performance between the interface 44 and the arc plate 42, further reducing the impact of high temperature and high pressure on the waste in the silo 5. At the same time, there is vibration interference during the continuous driving process of the motor 43. The provision of the rubber ring 45 reduces the wear of the interface 44 and the arc plate 42 during the engagement process, and prevents rotation from getting stuck.

[0049] A bracket 46 is fixed to the inner side of the circular ring 41, and the output shaft of the motor 43 is connected to the bracket 46. An array of cross bars 47 are fixed between the brackets 46, and extension columns 48 are arranged at intervals on the outer side of the cross bars 47. The extension columns 48 are rubber columns. The cross bars 47 stabilize the connection between the brackets 46 and the rotation path of the arc plate 42. When the circular plate rotates, the multiple cross bars 47 are synchronously driven to move, and the waste falling from the silo 5 can contact with the multiple cross bars 47. On the one hand, the cross bars 47 change the falling trajectory of the waste, so that the waste falls evenly in the shell 40 and falls into the furnace body 1, which is beneficial to the stability of the pyrolysis reaction, and is also beneficial to the stable generation of combustible gas and molten material, thereby improving the waste treatment efficiency and effect;

[0050] On the other hand, the crossbar 47 can break up the agglomerated waste materials through the extension column 48 to prevent the waste agglomerates from getting stuck in the feed inlet 10 and forming a blockage, which would prevent the subsequent waste materials from being further decomposed and affect the efficiency.

[0051] See attached Figure 5 A feed pipe 6 is connected to the bottom of the shell 40, and the feed pipe 6 is connected to the feed port 10. An upper retaining ring 60 is fixed to the bottom of the inner wall of the feed pipe 6. An annular sheet 61 is provided above the upper retaining ring 60. An inner tube 62 is connected to the lower inner side of the annular sheet 61. The inner tube 62 is a flexible tube. A spring 63 is connected between the annular sheet 61 and the upper retaining ring 60.

[0052] The top of the annular sheet 61 extends upward into the shell 40, and the top of the annular sheet 61 is connected to a guide ring 64, the outer edge of the guide ring 64 is bent upward and matched with the inner wall of the shell 40, and the bottom of the shell 40 is provided with an air hole 65 below the guide ring 64. The waste dispersed by the cross bar 47 will fall on the guide ring 64. Since the end of the guide ring 64 is bent upward, the waste will roll to the inside of the guide ring 64 under the action of gravity and pass through the inner tube 62, and finally reach the furnace body 1, reducing the possibility that the waste will stay at the bottom of the shell 40 and cannot be processed;

[0053] The waste material passes through the base and falls onto the guide ring 64. The guide ring 64 is pressed to drive the annular sheet 61 and the inner tube 62 to slide downward and squeeze the spring 63. The spring 63 relies on the ability to restore deformation to make the guide ring 64 slide up and down in the shell 40. On the one hand, it is helpful to prevent the metal waste material from adhering to the inner wall of the shell 40. On the other hand, the shaking guide ring 64 accelerates the falling of the waste material and improves the reaction efficiency.

[0054] The high-temperature gas generated during the pyrolysis of waste will act upward on the inner tube 62 and the annular sheet 61. Since the arc plate 42 closes the upper end of the shell 40 at this time, the air pressure inside the shell 40 increases. At this time, the air pressure acts on the annular sheet 61 to move upward and stretch the spring 63. At this time, since the gas continues to be generated, the annular sheet 61 continues to pull the spring 63 and drive the guide ring to slide in the shell 40, so that the space formed by the guide sheet and the shell 40 below expands and compresses, promoting the flow of air through the air hole 65, which is beneficial to heat dissipation of components such as the shell 40 and the guide ring, and improving the service life.

[0055] A lower retaining ring 66 is provided on the inner side of the discharge pipe 6 below the upper retaining ring 60. A roller 67 is provided around the upper end of the lower retaining ring 66. Multiple rollers 66 are fixed with the same connecting ring 68. A flexible plate 69 is provided on the inner side of the connecting ring 68. The end of the flexible plate 69 is inclined downward.

[0056] When the waste passes through the inner tube 62, it can contact each flexible plate 69, guiding the falling waste to the middle. When the metal waste begins to be pyrolyzed, the high-temperature gas acts on each flexible plate 69, causing the flexible plate 69 to swing upward. At this time, multiple flexible plates 69 form a closed state, which helps to block the upward flow of hot air and helps to concentrate the combustible gas generated after pyrolysis in the space above the crucible 2, thereby improving the collection efficiency and collection amount.

[0057] A plasma arc torch, the specific method of using the plasma arc torch comprises the following steps:

[0058] Step 1: Start the plasma arc torch 3 to heat the inner cavity of the furnace body 1 until the inner cavity temperature of the furnace body 1 reaches 1200° C.;

[0059] Step 2: According to the demand, the motor 43 is started to rotate the arc plate 42, and the raw materials in the silo 5 pass through the shell 40 and the feed port 10 and enter the furnace body 1;

[0060] Step 3: Start the motor 43 to close the raw material falling channel, thereby isolating the shell 40 from the silo 5. At the same time, the raw materials in the furnace body 1 are heated and decomposed.

[0061] The embodiments and / or implementation methods described above are only used to illustrate the preferred embodiments and / or implementation methods for realizing the technology of the present invention, and are not intended to limit the implementation methods of the technology of the present invention in any form. Any technical personnel in this field may make slight changes or modifications to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the present invention, but they should still be regarded as technologies or embodiments that are essentially the same as the present invention.

[0062] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the invention to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. A plasma arc torch comprising: A furnace body (1), wherein a crucible (2) is arranged in the furnace body (1), and a plasma arc torch (3) is arranged on the side of the crucible (2). The feature is that: a feed port (10) is provided at the top of the furnace body (1); a feed device (4) is connected to the top of the feed port (10); and a material bin (5) is connected to the top of the feed device (4); The material discharge device (4) comprises a shell (40), the shell (40) being connected to the material feed port (10) and the material bin (5), circular rings (41) being arranged in a transverse interval in the shell (40), arc plates (42) being fixedly arranged around the circular rings (41), and a motor (43) for driving the circular rings (41) to rotate is arranged outside the shell (40); The top of the shell (40) is provided with an interface (44), and the bottom end of the interface (44) is arranged in cooperation with the arc plate (42); A rubber ring (45) is provided at the bottom edge of the interface (44); A bracket (46) is fixed inside the circular ring (41), an output shaft of the motor (43) is connected to the bracket (46), cross bars (47) arranged in an array are fixed between the brackets (46), and extension columns (48) are arranged at intervals outside the cross bars (47), and the extension columns (48) are rubber columns; A feed pipe (6) is connected to the bottom of the housing (40), the feed pipe (6) is connected to the feed port (10), an upper retaining ring (60) is fixed to the bottom of the inner wall of the feed pipe (6), an annular sheet (61) is provided above the upper retaining ring (60), an inner tube (62) is connected to the lower inner side of the annular sheet (61), the inner tube (62) is a flexible tube, and a spring (63) is connected between the annular sheet (61) and the upper retaining ring (60); The top of the annular sheet (61) extends upward into the shell (40); the top of the annular sheet (61) is connected to a guide ring (64); the outer edge of the guide ring (64) is bent upward and is arranged in cooperation with the inner wall of the shell (40); the bottom end of the shell (40) is provided with an air hole (65) below the guide ring (64); A lower retaining ring (66) is provided on the inner side of the discharge pipe (6) below the upper retaining ring (60); a roller (67) is provided around the upper end of the lower retaining ring (66); a plurality of rollers (67) are fixed to the same connecting ring (68); a flexible plate (69) is provided on the inner side of the connecting ring (68); and the end of the flexible plate (69) is inclined downward.

2. A method for using a plasma arc torch, using the plasma arc torch according to claim 1, characterized by the following steps: Step 1: starting the plasma arc torch (3) to heat the inner cavity of the furnace body (1); Step 2: starting the motor (43) to rotate the arc plate (42), and the raw materials in the silo (5) successively pass through the shell (40) and the feed port (10) and enter the furnace body (1); Step three: starting the motor (43) to close the raw material falling channel, and the raw materials in the furnace body (1) are heated and decomposed.

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