A dual-rotation catalytic pyrolysis device and method

Abstract

The present invention discloses a dual-rotation catalytic pyrolysis device and method. The device includes a dual-rotation reactor, a pyrolysis gas catalytic system, etc., wherein the dual-rotation reactor is composed of a pyrolysis tank, a lifting blade, a stirring shaft, a crushing blade, a discharging blade, etc. The organic solid waste undergoes pyrolysis in the pyrolysis tank, and the raw materials at the bottom of the tank body are lifted along the wall by the rotation of the lifting blade, while the raw materials in the middle of the tank body fall and return to the bottom of the pyrolysis tank; the stirring shaft and the crushing blade rotate in the opposite direction to the pyrolysis tank, stirring and crushing the rising or falling raw materials, and peeling off the surface carbon residue; at the same time, the discharging blade is used for screening to effectively remove the carbon residue fragments, and retain the large-particle raw materials to continue to participate in the above cycle until the pyrolysis is complete. Using the above device to carry out continuous pyrolysis of organic solid waste under anaerobic conditions can effectively eliminate carbon residue to improve heat exchange efficiency, prevent raw material adhesion, and avoid the generation of harmful substances such as dioxins, thereby realizing high-value utilization of raw materials.

Description

Technical Field

[0001] The present invention belongs to the field of high-value utilization of organic solid waste, and in particular relates to a dual-rotating catalytic pyrolysis device. The present invention also provides a dual-rotating catalytic pyrolysis method using the pyrolysis device. Background Art

[0002] Organic solid waste (organic solid waste) refers to solid, semi-solid organic items and substances produced in production, life and other activities that have lost their original utilization value or have not lost their utilization value but have been discarded or abandoned; organic solid waste mainly includes agricultural and forestry waste, garbage, sludge, industrial waste, waste plastics, etc.

[0003] Conventional methods for treating organic solid waste include landfill and incineration, and landfill is still the main treatment method. Although landfill is simple to operate and widely adaptable, it takes a long time to treat, pollutes the soil and groundwater, causes secondary pollution, and has a huge negative impact on the surrounding environment; high-temperature incineration is low-cost, high-efficiency, and can treat a large amount of waste. It can quickly reduce weight and obtain usable heat energy, but it will produce pollutants such as dioxins during the combustion process.

[0004] Pyrolysis technology is an emerging technology for the efficient treatment of organic solid waste. The use of pyrolysis technology to treat organic solid waste has the advantages of high treatment efficiency, wide material adaptability, and short treatment cycle, and can produce high-value chemicals or fuels; through appropriate catalytic means, the selectivity and yield of the target pyrolysis products can be effectively improved, and the quality of the liquid products can be improved.

[0005] The commonly used pyrolysis devices at present mainly include fixed bed, fluidized bed and rotary pyrolysis devices. Fixed bed pyrolysis devices have problems such as uneven heating of materials and adhesion of materials during the pyrolysis process; fluidized bed pyrolysis devices have disadvantages such as high requirements for the size of organic solid waste raw materials, poor adaptability, and difficulty in separating the fluidized medium and the catalyst. Rotary pyrolysis devices can be divided into internal rotation reactors with shaft rotation and external rotation reactors with tank rotation. They can assist in stirring the raw materials through rotation to make them heated evenly. However, a single external rotation reactor, such as a pyrolysis rotary kiln disclosed in Chinese patent application CN202010325249.5, has problems such as material adhesion during pyrolysis and large discharge particles leading to incomplete pyrolysis; and a rotary pyrolysis furnace disclosed in Chinese patent application CN202010051988.X has problems such as insufficient stirring intensity, uneven heating, low heat exchange rate, and difficulty in discharging. As for a single internal rotation reactor, such as a vertical pyrolysis reactor disclosed in Chinese patent application CN201910417628.4 or a pyrolysis furnace disclosed in Chinese patent application CN201720523926.8, the stirring device only stirs the material in the stirring rotation plane, and the collision effect of materials between different layers in the furnace is weak, making it difficult for the material to be completely pyrolyzed. Even if the two existing types of rotary devices are simply combined, it is difficult to overcome the problem of heat being difficult to penetrate into the interior of the material and the material bonding. At the same time, taking into account the characteristics of large amounts of organic solid waste generated, poor thermal conductivity, and complex composition, it is urgent to design a continuous pyrolysis device that can crush materials, improve the heat exchange efficiency of organic solid waste, and prevent material bonding. Summary of the invention

[0006] The present invention mainly solves the technical problem that the current organic solid waste pyrolysis reaction device has the disadvantages of poor adaptability of raw material components, high requirements on raw material size, easy adhesion of raw materials, low heat exchange efficiency, etc., and cannot truly achieve efficient disposal of organic solid waste. A dual-rotating catalytic pyrolysis device and method are provided.

[0007] In order to solve the above technical problems, the present invention provides a dual-rotating catalytic pyrolysis device, comprising a pyrolysis gas catalytic system, the pyrolysis gas catalytic system having a pyrolysis gas inlet, a flue gas inlet connected to a burner, a pyrolysis gas outlet connected to a condensation collection device, and a secondary flue gas outlet;

[0008] an outer shell, the outer shell being formed with a feed port, an air outlet, a flue gas inlet and a flue gas outlet, the air outlet being connected to the pyrolysis gas inlet of the pyrolysis gas catalytic system, the flue gas inlet being connected to the secondary flue gas outlet of the pyrolysis gas catalytic system; and,

[0009] A double rotary reactor, comprising a pyrolysis tank rotatably mounted in the outer shell and a stirring shaft extending along the rotation axis of the pyrolysis tank, wherein:

[0010] The pyrolysis tank is connected to a coaxial discharge channel extending outside the external shell, and a lifting blade extending around the rotation axis is connected to the inner wall surface of the pyrolysis tank; the rotation axes of the pyrolysis tank and the discharge channel are inclined relative to the vertical direction, and a flue is formed between the pyrolysis tank and the external shell; the feed port and the gas outlet are respectively connected to the inner cavity of the pyrolysis tank, and the smoke inlet and the smoke outlet are respectively connected to the flue;

[0011] The stirring shaft is connected with crushing blades and discharging blades, and the crushing blades are composed of a plurality of stirring rods or plate-type stirring paddles with slots; the crushing blades are distributed in the gaps of the lifting blades and the extension length is smaller than the inner diameter of the corresponding lifting blades on the rotating plane, so as to allow the stirring shaft to be driven to rotate in the opposite direction relative to the pyrolysis tank; the discharging blades have the same rotation direction as the lifting blades, and the discharging blades are located in the discharging channel.

[0012] Preferably, the pyrolysis tank has a double-conical cylinder with conical bottoms connected to each other, and the discharge channel is connected to the bottom end of the double-conical cylinder and has the same inner diameter as the bottom end.

[0013] Preferably, an upper receiving system and a lower receiving system are provided on the external shell, the upper end of the pyrolysis tank is supported on the upper receiving system, and the lower end is supported on the lower receiving system through the discharge channel.

[0014] Preferably, the dual-rotation catalytic pyrolysis device also includes an external rotation drive device that is transmission-connected to the pyrolysis tank and the discharge channel and an internal rotation drive device that is transmission-connected to the stirring shaft; the external rotation drive device is configured to be able to drive the pyrolysis tank and the discharge channel to rotate in the external shell and enable the lifting blades to transport at least part of the solid material in the pyrolysis tank upward; the internal rotation drive device is configured to be able to drive the stirring shaft to rotate in the opposite direction relative to the pyrolysis tank and screen the solid material entering the discharge channel.

[0015] Preferably, the feed port is connected to a hopper, a discharge port connected to a solid collecting device is formed at the bottom end of the discharge channel, and a smoke outlet of the external shell is connected to a purification device.

[0016] Preferably, heat exchange fins are arranged on the outer wall surface of the pyrolysis tank.

[0017] Preferably, the interval between the upper end of the lifting blade and the feed port and the gas outlet is not less than 200 mm, and the angle between the rotation axis of the pyrolysis tank and the horizontal plane is 30-60°.

[0018] Preferably, the gap between the outer edge of the discharge blade and the inner wall of the discharge channel is less than 2 mm, and the pitch of the discharge blade is 2-6 mm.

[0019] The present invention also provides a dual-rotation catalytic pyrolysis method using the pyrolysis device, comprising the following steps:

[0020] S1. The dual rotary reactor starts to operate, driving the pyrolysis tank and the stirring shaft to rotate in opposite directions respectively;

[0021] S2. The flue gas generated by the burner enters the flue through the pyrolysis gas catalytic system to preheat the pyrolysis gas catalytic system and the dual rotary reactor;

[0022] S3. Add the pretreated organic solid waste raw material into the pyrolysis tank through the feed port, and continuously feed it into the pyrolysis tank at a certain feed rate;

[0023] S4. The pyrolysis tank drives the lifting blade to rotate, so that the organic solid waste raw materials at the bottom of the pyrolysis tank are gradually lifted to the top of the pyrolysis tank along the inner wall of the pyrolysis tank, and then the organic solid waste raw materials fall from the middle of the pyrolysis tank and return to the bottom of the pyrolysis tank; at the same time, the stirring shaft drives the crushing blade to rotate in the opposite direction to the rotation direction of the pyrolysis tank, stirs and crushes the rising or falling organic solid waste raw materials, so that the organic solid waste raw materials are heated evenly, and continuously peels off the residual carbon on the surface that is fully pyrolyzed; the residual carbon fragments produced by peeling continuously move downward in the pyrolysis tank, and are discharged through the discharge channel through the screening effect of the discharging blade; and the organic solid waste raw materials with a size not less than a predetermined size are hindered by the discharging blade and stay in the pyrolysis tank. Under the stirring and crushing action of the lifting blade and the crushing blade, they continuously and repeatedly circulate between the top and bottom of the pyrolysis tank, continue to be thermally decomposed to produce pyrolysis gas, and the volume is reduced until the pyrolysis is complete;

[0024] S5. The pyrolysis gas generated by the pyrolysis of the organic solid waste raw material enters the pyrolysis gas catalytic system through the gas outlet, undergoes a catalytic reaction with the flue gas generated by the burner in the pyrolysis gas catalytic system, and is then discharged through the pyrolysis gas outlet;

[0025] S6. The flue gas discharged from the pyrolysis gas catalytic system is introduced into the flue to provide heat for the pyrolysis of the organic solid waste raw materials, and is discharged through the flue gas outlet after pollutants are removed by the purification system.

[0026] Preferably, the pyrolysis temperature of the dual-rotating reactor is 300-600°C, and the catalytic temperature of the pyrolysis gas catalytic system is 500-800°C.

[0027] The core of the dual-rotating catalytic pyrolysis device described in the present invention lies in the lifting blades arranged on the inner wall of the pyrolysis tank and the crushing blades and discharging blades arranged on the stirring shaft; after the organic solid waste raw materials enter the pyrolysis tank, the external rotating drive device drives the pyrolysis tank and the spiral belt-shaped lifting blades to rotate, and the blades can apply an upward lifting force along the wall to the organic solid waste raw materials in contact with the spiral blades, so that the large-particle organic solid waste raw materials at the bottom of the pyrolysis tank are gradually lifted along the inner wall of the pyrolysis tank to the top of the pyrolysis tank, and then due to the reduction in the diameter of the lifting blades, the organic solid waste raw materials are pushed to the middle of the pyrolysis tank and fall back to the bottom of the pyrolysis tank; at the same time, the internal rotating drive device drives the stirring shaft and the crushing blades to rotate in the opposite direction to the rotation direction of the pyrolysis tank, and the organic solid waste raw materials at the top and bottom of the pyrolysis tank are rotated. The organic solid waste raw materials are stirred and crushed during the circulation movement between the ends, so that the organic solid waste raw materials are heated evenly, and the residual carbon on the surface that is fully pyrolyzed is continuously peeled off; the residual carbon fragments produced by the peeling continuously move downward in the pyrolysis tank, and after the particle size is screened by the pitch limit of the discharge blade, they are discharged to the solid collection device through the discharge port; and the organic solid waste raw materials with a size not less than the predetermined size are blocked by the discharge blade and stay in the pyrolysis tank. Under the stirring and crushing action of the lifting blade and the crushing blade, the circulation process inside the pyrolysis tank is continuously repeated, and the thermal decomposition is continuously performed to produce pyrolysis gas, and the volume is reduced until the pyrolysis is complete; the pyrolysis gas generated in this process enters the pyrolysis gas catalytic system through the gas outlet for catalytic treatment, so as to improve the quality of the pyrolysis gas itself, and its beneficial effects mainly include:

[0028] 1. Wide applicability of raw material types: It can be applied to organic solid waste of various components and sizes, without the need for deep sorting and crushing of raw materials.

[0029] 2. Organic solid waste raw materials participate in a large-scale circulation to prevent sticking: The double-conical external rotating tank body is arranged tilted, and the diameter of the lifting blade increases first and then decreases with the diameter of the rotating section where the pyrolysis tank wall is located. This structure can provide thrust for the organic solid waste raw materials, allowing them to circulate in a large range from the bottom to the top near the pyrolysis tank wall and from the top to the bottom inside the pyrolysis tank, so that they are violently stirred and heated evenly, and in the rapid collision of the crushing blades, large pieces of material are impacted and dispersed to prevent sticking.

[0030] 3. Crushing the carbon residue on the surface of organic solid waste and improving pyrolysis efficiency: When the organic solid waste raw materials in the pyrolysis tank rise and fall along the inner wall of the external rotating tank, they are quickly collided with the reverse internal rotating material crushing blades, which can shear and crush the raw materials passing through, remove the carbon residue on the surface, continuously expose the unpyrolyzed part inside the raw materials, and enhance heat exchange. However, a single external or internal rotating reactor can only stir the raw materials and it is difficult to produce a shearing effect.

[0031] 4. Automatic screening of discharge, low requirements for raw material size: adjust the pitch of the spiral discharge blade to control the size of the discharge particles, that is, only the residual carbon fragments with a particle size smaller than the pitch of the discharge blade can be discharged from the reactor through the spiral channel of the discharge blade, while the large particles of organic solid waste raw materials that are not completely pyrolyzed will continue to participate in the circulation movement inside the tank until the pyrolysis is complete. Automatic screening of discharge through size restriction can reduce the requirements for the size of organic solid waste raw materials when feeding.

[0032] 5. The pyrolysis reaction conditions are easy to control and have strong adaptability to changes in organic solid waste components: the working conditions of the pyrolysis reactor and catalytic system can be flexibly changed by adjusting the internal and external speeds, flue gas temperature, and catalyst type to adapt to different raw materials.

[0033] 6. Resource utilization of products: Use organic solid waste to produce high-value chemicals or fuels, and through catalysis, further improve the yield and selectivity of target products, improve product quality, and realize resource utilization of organic solid waste.

[0034] 7. Non-in-situ catalytic pyrolysis: The composition of organic solid waste raw materials is complex. The use of non-in-situ catalytic method to separate the pyrolysis and catalytic steps can effectively avoid the separation problem of catalyst and pyrolysis carbon residue.

[0035] 8. Clean emission: The pyrolysis process of organic solid waste raw materials is an anaerobic process that can produce reducing components such as H2 and CO. The temperature is low and the residence time is long enough, which can effectively inhibit the generation of harmful substances such as dioxins from the source and achieve harmless treatment of organic solid waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A system schematic diagram of a dual-rotating catalytic pyrolysis device provided in an embodiment of the present invention;

[0037] Figure 2 A flow chart of the steps of the dual-rotation catalytic pyrolysis method provided in an embodiment of the present invention.

[0038] [Main component symbols]

[0039] 1-gas outlet; 2-pyrolysis gas catalytic system; 3-double rotary reactor; 4-lower receiving system; 5-discharging port; 6-inner rotary drive device; 7-outer rotary drive device; 8-external shell; 9-smoke duct; 10-upper receiving system; 11-feeding port; 12-hopper;

[0040] 301-pyrolysis tank; 302-lifting blade; 303-stirring shaft; 304-crushing blade; 305-discharging channel; 306-discharging blade. DETAILED DESCRIPTION

[0041] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0042] In view of the existing problems, the present invention provides a dual-rotation catalytic pyrolysis device and method, which has the advantages of strengthening material collision, reducing surface carbon residue, preventing material adhesion, and controlling the discharge volume of organic solid waste pyrolysis products.

[0043] In order to realize the above technical solution, Figure 1 As shown, an embodiment of the present invention provides a dual-rotating catalytic pyrolysis device, Figure 1 A system schematic diagram of a dual-rotating catalytic pyrolysis device provided in an embodiment of the present invention.

[0044] The dual-rotation catalytic pyrolysis device includes an outlet 1, a pyrolysis gas catalytic system 2, a dual-rotation reactor 3, a lower receiving system 4, a discharge port 5, an inner rotation drive device 6, an outer rotation drive device 7, an outer shell 8, a flue 9, an upper receiving system 10, a feed port 11 and a hopper 12; the dual-rotation reactor 3 includes a pyrolysis tank 301, a material lifting blade 302, a stirring shaft 303, a material crushing blade 304, a discharge channel 305 and a discharge blade 306. Among them:

[0045] The pyrolysis tank 301 in the double-rotation reactor 3 of this embodiment uses a hollow double-conical stirring drum, which is rotated by an external rotary drive device 7 to pyrolyze organic solid waste raw materials; the lifting blade 302 uses a spiral belt blade with a fixed rotation direction, which is fixed on the inner wall of the pyrolysis tank 301, and its lower end is connected to the lower end of the pyrolysis tank 301, and the upper end is spaced apart from the gas outlet 1 and the feed inlet 11. It rotates together with the pyrolysis tank 301 to make the organic solid waste raw materials rise from the bottom of the pyrolysis tank 301 along the inner wall of the tank; the stirring shaft 303 is rotated in the opposite direction to that of the pyrolysis tank 301 by an internal rotary drive device 6; the crushing blade 304 is composed of a plurality of stirring rods or plate stirring paddles with slots, and a crushing blade or a crushing hammer component is installed to strengthen crushing and collision, and its solid It is fixed on the stirring shaft 303 and rotates together with the stirring shaft 303, stirring and colliding the organic solid waste raw materials when they rise and fall; the discharge channel 305 is a hollow cylindrical structure, which rotates along with the pyrolysis tank 301, and the discharge channel 305 is connected to the discharge port 5 to discharge the material; the discharge blade 306 uses a spiral belt blade, and its rotation direction is the same as that of the lifting blade 302. The discharge blade 306 is fixed on the stirring shaft 303, and its upper end is close to the upper end surface of the discharge channel 305. The discharge blade 306 uses its pitch to control the discharge size of the organic solid waste; the hopper 12 is connected to the feed port 11 to transport the organic solid waste raw materials; the gas outlet 1 is connected to the pyrolysis gas catalytic system 2 to transport the pyrolysis gas; the high-temperature flue gas passes through the pyrolysis gas catalytic system 2 and enters the flue 9 to heat the pyrolysis tank. Among them, the pyrolysis gas catalytic system 2 has a pyrolysis gas inlet, a flue gas inlet, a pyrolysis gas outlet and a secondary flue gas outlet. Its flue gas inlet is connected to the burner so as to receive the high-temperature flue gas discharged from the burner; its pyrolysis gas inlet can be connected to the gas outlet 1 of the external shell 8 so as to receive the pyrolysis gas generated by the pyrolysis of the organic solid waste raw materials in the pyrolysis tank 301. In the pyrolysis gas catalytic system 2, the pyrolysis gas undergoes a catalytic reaction under the action of the high-temperature flue gas discharged from the burner, and then is discharged to the condensation collection device through the pyrolysis gas outlet for subsequent treatment and utilization. The sub-high-temperature flue gas in the pyrolysis gas catalytic system 2 is discharged through its secondary flue gas outlet and enters the flue 9 through the flue gas inlet of the external shell 8, which is used to provide heat energy for the pyrolysis of the organic solid waste raw materials in the pyrolysis tank 301.

[0046] according to Figure 1 The double rotating reactor 3 embodiment shown, wherein:

[0047] The diameters of the gas outlet 1 and the feed port 11 are both 100 mm; the axial height of the pyrolysis tank 301 is 2000 mm, and the maximum diameter is 1500 mm; the upper end of the lifting blade 302 is 300 mm away from the feed port 11 and the gas delivery port 1, and the lower end is connected to the discharge channel 305. The blade thickness is 5 mm, the minimum inner diameter is 600 mm, and the outer diameter varies with the tank diameter; the shaft diameter of the stirring shaft 303 is 100 mm, and the length is 3000 mm; the crushing blade The outer diameter of the sheet 304 is in close contact with the inner diameter of the lifting blade 302, with a gap of 2mm; the axial height of the discharge channel 305 is 500mm, and the diameter is 500mm; the outer diameter of the discharge blade 306 is in close contact with the inner wall of the discharge channel, with a gap of 2mm, and its blade thickness is 2mm and the pitch is 4mm; the upper end of the discharge port 5 is in contact with the discharge channel, with a diameter of 500mm; the angle between the axis of the pyrolysis tank 301, the discharge channel 305 and the stirring shaft 303 and the horizontal plane is 45°.

[0048] In the dual-rotating catalytic pyrolysis device provided by the present invention, the pyrolysis tank 301 can be rotatably mounted in the outer shell 8 in a variety of appropriate ways. In the illustrated preferred embodiment, the shell wall of the outer shell 8 is provided with an upper receiving system 10 and a lower receiving system 4 opposite to each other, and the central axes of the two are collinear. Typically, the upper receiving system 10 and the lower receiving system 4 can be bearings. Thus, the upper end of the pyrolysis tank 301 can be supported on the upper receiving system 10, and supported on the lower receiving system 4 at the lower end through the discharge channel 305. Similarly, the stirring shaft 303 can also be rotatably supported on the pyrolysis tank 301 (including the discharge channel 305) by bearings or the like.

[0049] In order to drive the pyrolysis tank 301 and the stirring shaft 303 to rotate, a power device for driving can be appropriately provided, such as connecting an engine, an electric motor, etc. to the pyrolysis tank 301 and the stirring shaft 303 through a transmission mechanism. In a preferred embodiment of the present invention, an external rotary drive device 7 and an internal rotary drive device 6 are respectively used to drive the pyrolysis tank 301 and the stirring shaft 303, so as to control the rotation speed of the lifting blade 302, the crushing blade 304 and the discharging blade 306 as needed.

[0050] As a better implementation:

[0051] The maximum feed amount of the pyrolysis tank is 2 / 3 of its volume.

[0052] In order to better implement the above technical solution, the present invention also provides a dual-rotation catalytic pyrolysis method, which uses the above dual-rotation catalytic pyrolysis device and includes the following steps:

[0053] S1. The dual rotary reactor starts to operate, driving the pyrolysis tank and the stirring shaft to rotate in opposite directions respectively;

[0054] S2. The flue gas generated by the burner enters the flue through the pyrolysis gas catalytic system to preheat the pyrolysis gas catalytic system and the dual rotary reactor;

[0055] S3. Add the pretreated organic solid waste raw material into the pyrolysis tank through the feed port, and continuously feed it into the pyrolysis tank at a certain feed rate;

[0056] S4. The pyrolysis tank drives the lifting blade to rotate, so that the organic solid waste raw materials at the bottom of the pyrolysis tank are gradually lifted to the top of the pyrolysis tank along the inner wall of the pyrolysis tank, and then the organic solid waste raw materials fall from the middle of the pyrolysis tank and return to the bottom of the pyrolysis tank; at the same time, the stirring shaft drives the crushing blade to rotate in the opposite direction to the rotation direction of the pyrolysis tank, stirs and crushes the rising or falling organic solid waste raw materials, so that the organic solid waste raw materials are heated evenly, and continuously peels off the residual carbon on the surface that is fully pyrolyzed; the residual carbon fragments produced by peeling continuously move downward in the pyrolysis tank, and are discharged through the discharge channel through the screening effect of the discharging blade; and the organic solid waste raw materials with a size not less than a predetermined size are hindered by the discharging blade and stay in the pyrolysis tank. Under the stirring and crushing action of the lifting blade and the crushing blade, they continuously and repeatedly circulate between the top and bottom of the pyrolysis tank, continue to be thermally decomposed to produce pyrolysis gas, and the volume is reduced until the pyrolysis is complete;

[0057] S5. The pyrolysis gas generated by the pyrolysis of the organic solid waste raw material enters the pyrolysis gas catalytic system through the gas outlet, undergoes a catalytic reaction with the flue gas generated by the burner in the pyrolysis gas catalytic system, and is then discharged through the pyrolysis gas outlet;

[0058] S6. The flue gas discharged from the pyrolysis gas catalytic system is introduced into the flue to provide heat for the pyrolysis of the organic solid waste raw materials, and is discharged through the flue gas outlet after pollutants are removed by the purification system.

[0059] As a better implementation:

[0060] In step S4, the rotation speed of the pyrolysis tank of the dual-rotating catalytic pyrolysis device is 60 r / min, the rotation speed of the stirring shaft is 40 r / min, the temperature of the pyrolysis reaction is 300-600°C, and the temperature of the non-in-situ catalytic reaction is 500-800°C.

[0061] The specific steps are as follows:

[0062] After starting work, turn on the outer rotary drive device and the inner rotary drive device to start the operation of the dual rotary reactor, wherein the outer rotary drive device drives the pyrolysis tank and the discharge channel to rotate, and the inner rotary drive device drives the stirring shaft to rotate, so that the rotation direction of the stirring shaft is opposite to that of the pyrolysis tank; the high-temperature flue gas generated by the burner enters the flue through the pyrolysis gas catalytic system to preheat the pyrolysis gas catalytic system and the dual rotary reactor; when the preheating temperature reaches the standard, the pretreated organic solid waste raw material is added to the hopper, and is continuously fed into the pyrolysis tank through the feed port at a certain feed rate; under the joint action of the lifting blades on the pyrolysis tank and the crushing blades on the stirring shaft, the residual carbon on the surface of the organic solid waste is continuously stripped off, and the residual carbon fragments produced by the stripping are discharged to the solid collection device through the discharge port through the screening action of the discharge blades; the pyrolysis gas generated in this process enters the pyrolysis gas catalytic system through the gas outlet for catalytic conversion and utilization.

[0063] The process of using a dual-rotating catalytic pyrolysis device for dual-rotating catalytic pyrolysis is described in detail below through specific examples, and each example uses a device with basically the same structure.

[0064] Embodiment 1:

[0065] After starting work, the outer rotary drive device 7 and the inner rotary drive device 6 are turned on to start the dual rotary reactor 3, wherein the outer rotary drive device 7 drives the pyrolysis tank 301 and the discharge channel 305 to rotate, and the inner rotary drive device 6 drives the stirring shaft 303 to rotate, and the rotation direction of the stirring shaft 303 is opposite to that of the pyrolysis tank 301; the high-temperature flue gas generated by the burner passes through the pyrolysis gas catalytic system 2 and enters the flue 9 to preheat the pyrolysis gas catalytic system 2 and the dual rotary reactor 3; when the pyrolysis temperature is 550°C and the catalytic temperature is 600°C, the hopper 12 is charged with Add the pre-treated urban domestic waste raw materials, and continuously feed them into the pyrolysis tank 301 through the feed port 11 at a certain feed rate; under the joint action of the lifting blade 302 on the pyrolysis tank 301 and the crushing blade 304 on the stirring shaft 303, the carbon residue on the surface of the urban domestic waste is continuously peeled off, and the carbon residue fragments produced by the peeling are discharged to the solid collection device through the discharge port 5 through the screening action of the discharge blade 306; the pyrolysis gas generated in this process enters the pyrolysis gas catalytic system 2 through the gas outlet 1 for catalytic conversion treatment using a metal oxide catalyst. The entire device realizes the non-in-situ catalytic pyrolysis of urban domestic waste, effectively curbs the emission of harmful substances such as dioxins, and the weight reduction rate reaches 80.6wt%, realizing the harmless treatment of organic solid waste.

[0066] Embodiment 2:

[0067] After starting work, the outer rotary drive device 7 and the inner rotary drive device 6 are turned on to start the dual rotary reactor 3, wherein the outer rotary drive device 7 drives the pyrolysis tank 301 and the discharge channel 305 to rotate, and the inner rotary drive device 6 drives the stirring shaft 303 to rotate, and the rotation direction of the stirring shaft 303 is opposite to that of the pyrolysis tank 301; the high-temperature flue gas generated by the burner passes through the pyrolysis gas catalytic system 2 and enters the flue 9 to preheat the pyrolysis gas catalytic system 2 and the dual rotary reactor 3; when the pyrolysis temperature is 500°C and the catalytic temperature is 650°C, the hopper 12 is charged with a catalytic gas. The pretreated discarded medical mask raw material is added to the pyrolysis tank 301 through the feed port 11 at a certain feed rate; under the joint action of the lifting blade 302 on the pyrolysis tank 301 and the crushing blade 304 on the stirring shaft 303, the residual carbon on the surface of the discarded medical mask is continuously peeled off, and the residual carbon fragments produced by the peeling are discharged to the solid collection device through the discharge port 5 through the screening action of the discharge blade 306; the pyrolysis gas generated in this process enters the pyrolysis gas catalytic system 2 through the gas outlet 1 for catalytic conversion and utilization using a molecular sieve catalyst. The entire device realizes the non-in-situ catalytic pyrolysis of discarded medical masks, the yield of liquid products is 49.8wt%, the yield of solid products is 10.5wt%, of which the target product aromatics accounts for 75.2wt% in the liquid products, realizing the high-value utilization of discarded medical masks.

[0068] In the description of the present invention, the terms "upper", "lower", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be understood as a limitation on the present invention; unless otherwise clearly specified and limited, the terms "connected", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0069] For the above-mentioned embodiments of the present invention, the common knowledge such as the known specific structures and characteristics in the scheme is not described in detail; each embodiment is described in a progressive manner, and the technical features involved in each embodiment can be combined with each other under the premise that there is no conflict between each other, and the same and similar parts between the embodiments can be referred to each other. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles described in the present invention, and these improvements and modifications should also be regarded as falling within the scope of protection of the present invention.

Claims

1. A dual-rotating catalytic pyrolysis device, characterized in that: include: A pyrolysis gas catalytic system (2), the pyrolysis gas catalytic system (2) comprising a pyrolysis gas inlet, a flue gas inlet connected to a burner, a pyrolysis gas outlet connected to a condensation collection device, and a secondary flue gas outlet; An external shell (8), the external shell (8) being formed with a feed port (11), a gas outlet (1), a flue gas inlet and a flue gas outlet, the gas outlet (1) being connected to a pyrolysis gas inlet of a pyrolysis gas catalytic system (2), the flue gas inlet being connected to a secondary flue gas outlet of the pyrolysis gas catalytic system (2); and, A dual-rotation reactor (3), comprising a pyrolysis tank (301) rotatably mounted in the outer shell (8) and a stirring shaft (303) extending along the rotation axis of the pyrolysis tank (301), wherein: The pyrolysis tank (301) is connected to a coaxial discharge channel (305) extending outside the external shell (8); a lifting blade (302) extending around the rotation axis is connected to the inner wall surface of the pyrolysis tank (301); the rotation axes of the pyrolysis tank (301) and the discharge channel (305) are inclined relative to the vertical direction, and a flue (9) is formed between the pyrolysis tank (301) and the external shell (8); the feed port (11) and the gas outlet (1) are respectively connected to the inner cavity of the pyrolysis tank (301), and the flue gas inlet and the flue gas outlet are respectively connected to the flue (9); The stirring shaft (303) is connected with a material crushing blade (304) and a material discharging blade (306), wherein the material crushing blade (304) is composed of a plurality of stirring rods or plate-type stirring paddles provided with slots; the material crushing blade (304) is distributed in the gap between the material lifting blades (302) and has an extension length smaller than the inner diameter of the corresponding material lifting blade (302) on the rotation plane, so as to allow the stirring shaft (303) to be driven to rotate in the opposite direction relative to the pyrolysis tank (301); the material discharging blade (306) has the same rotation direction as the material lifting blade (302), and the material discharging blade (306) is located in the material discharging channel (305); The dual-rotation catalytic pyrolysis device further comprises an external rotation drive device (7) which is transmission-connected to the pyrolysis tank (301) and the discharge channel (305), and an internal rotation drive device (6) which is transmission-connected to the stirring shaft (303); the external rotation drive device (7) is configured to be able to drive the pyrolysis tank (301) and the discharge channel (305) to rotate in the external shell (8) and enable the lifting blades (302) to transport at least part of the solid material in the pyrolysis tank (301) upward; the internal rotation drive device (6) is configured to be able to drive the stirring shaft (303) to rotate in the opposite direction relative to the pyrolysis tank (301) and screen the solid material entering the discharge channel (305); The pyrolysis tank (301) comprises a double-conical cylinder with conical bottoms connected to each other, and the discharge channel (305) is connected to the bottom end of the double-conical cylinder and has the same inner diameter as the bottom end.

2. The dual-rotating catalytic pyrolysis device according to claim 1, characterized in that: An upper receiving system (10) and a lower receiving system (4) are provided on the outer shell (8); the upper end of the pyrolysis tank (301) is supported on the upper receiving system (10), and the lower end is supported on the lower receiving system (4) through the discharge channel (305).

3. The dual-rotating catalytic pyrolysis device according to claim 1, characterized in that: The feed port (11) is connected to a hopper (12), a discharge port (5) connected to a solid collection device is formed at the bottom end of the discharge channel (305), and a smoke outlet of the external shell (8) is connected to a purification device.

4. The dual-rotating catalytic pyrolysis device according to claim 1, characterized in that: Heat exchange fins are arranged on the outer wall surface of the pyrolysis tank (301).

5. The dual-rotating catalytic pyrolysis device according to claim 1, characterized in that: The distance between the upper end of the lifting blade (302) and the feed port (11) and the gas outlet (1) is not less than 200 mm, and the angle between the rotation axis of the pyrolysis tank (301) and the horizontal plane is 30-60 degrees.

6. The dual-rotating catalytic pyrolysis device according to claim 1, characterized in that: The gap between the outer edge of the discharge blade (306) and the inner wall of the discharge channel (305) is less than 2 mm, and the pitch of the discharge blade (306) is 2-6 mm.

7. A dual-rotation catalytic pyrolysis method using the dual-rotation catalytic pyrolysis device according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. The dual rotary reactor starts running, driving the pyrolysis tank and the stirring shaft to rotate in opposite directions respectively; S2. The flue gas generated by the burner enters the flue through the pyrolysis gas catalytic system to preheat the pyrolysis gas catalytic system and the dual rotary reactor; S3. Add the pretreated organic solid waste raw material into the pyrolysis tank through the feed port, and continuously feed it into the pyrolysis tank at a certain feed rate; S4. The pyrolysis tank drives the lifting blade to rotate, so that the organic solid waste raw materials at the bottom of the pyrolysis tank are gradually lifted to the top of the pyrolysis tank along the inner wall of the pyrolysis tank, and then the organic solid waste raw materials fall from the middle of the pyrolysis tank and return to the bottom of the pyrolysis tank; at the same time, the stirring shaft drives the crushing blade to rotate in the opposite direction to the rotation direction of the pyrolysis tank, stirs and crushes the rising or falling organic solid waste raw materials, so that the organic solid waste raw materials are heated evenly, and continuously peels off the residual carbon on the surface that is fully pyrolyzed; the residual carbon fragments produced by peeling continuously move downward in the pyrolysis tank, and are discharged through the discharge channel through the screening effect of the discharge blade; and the organic solid waste raw materials with a size not less than a predetermined size are hindered by the discharge blade and stay in the pyrolysis tank. Under the stirring and crushing effect of the lifting blade and the crushing blade, they continuously and repeatedly circulate between the top and bottom of the pyrolysis tank, continue to be thermally decomposed to produce pyrolysis gas, and the volume is reduced until the pyrolysis is complete; S5. The pyrolysis gas generated by the pyrolysis of the organic solid waste feedstock enters the pyrolysis gas catalytic system through the gas outlet, and undergoes a catalytic reaction with the flue gas generated by the burner in the pyrolysis gas catalytic system, and is then discharged through the pyrolysis gas outlet; S6. The flue gas discharged from the pyrolysis gas catalytic system is introduced into the flue to provide heat for the pyrolysis of the organic solid waste raw materials, and is discharged through the flue gas outlet after pollutants are removed by the purification system.

8. The dual-rotation catalytic pyrolysis method according to claim 7, characterized in that: The pyrolysis temperature of the dual-rotating reactor (3) is 300-600°C, and the catalytic temperature of the pyrolysis gas catalytic system (2) is 500-800°C.

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