A low-energy plastic waste pyrolysis equipment

Abstract

This utility model discloses a low-energy plastic waste pyrolysis device, relating to the technical field of waste recycling and processing equipment. The pyrolysis device includes a furnace body, a reflux cylinder, a heating device, a feeding device, and a screening plate. The inner wall of the furnace body is provided with a first spiral blade, and the inner wall of the reflux cylinder is provided with a second spiral blade. The spiral directions of the first and second spiral blades are opposite, so that when the furnace body rotates, the material conveying directions of the first and second spiral blades are opposite. This utility model's pyrolysis device cleverly sends the heated heat-conducting balls located at the discharge end of the furnace body back to the feed end of the furnace body, mixing them with the added plastic waste. Through the dual heating effect of the heat-conducting balls inside the furnace body and external heating, the poorly conductive plastic waste can be rapidly heated to the pyrolysis conditions, effectively reducing the heating temperature of the external heating device of the furnace body, thus achieving low-energy and high-efficiency processing of plastic waste.

Description

Technical Field

[0001] This utility model relates to the technical field of waste recycling and processing equipment, and in particular to a low-energy plastic waste pyrolysis equipment. Background Technology

[0002] With the widespread use of plastic products globally, the amount of plastic waste generated has increased dramatically. As a typical polymer waste, plastic waste is characterized by a long degradation cycle and significant environmental harm, and its pollution problem has become a focus of global ecological governance.

[0003] Traditional methods of plastic waste disposal primarily rely on landfill and incineration. However, landfill not only occupies vast amounts of valuable land resources but also risks allowing microplastics to seep into groundwater systems, causing long-term harm to the ecological environment and human health. While incineration can reduce waste volume, it may produce toxic gases such as dioxins during the process, causing secondary pollution to the atmosphere and further exacerbating the environmental burden. To address these issues and achieve the dual goals of resource conservation and environmental protection, pyrolysis has gradually become an important direction for plastic waste treatment. Pyrolysis, through high-temperature decomposition in an anaerobic or low-oxygen environment, can convert plastic waste into usable energy or chemical raw materials, thereby reducing environmental pollution while achieving resource recycling and reuse.

[0004] Currently, the pyrolysis treatment of plastic waste mainly relies on pyrolysis furnaces. In this process, plastic waste is fed into the furnace, and external heating raises the furnace temperature to the plastic's pyrolysis temperature, thus achieving high-temperature decomposition. Because plastic waste is a high-molecular-weight polymer, it requires a high heating temperature to undergo pyrolysis, and its thermal conductivity is poor. Therefore, the pyrolysis furnace is typically heated to a temperature significantly higher than the plastic's pyrolysis temperature, and the heating time is also long enough for the plastic inside the furnace to fully reach the pyrolysis temperature. This leads to a significant increase in energy consumption and a slow pyrolysis rate, resulting in high processing costs and low efficiency, making it difficult to meet industrialization needs. Therefore, there is an urgent need for a more efficient and energy-saving plastic waste pyrolysis device to address the shortcomings of existing technologies and promote the industrialization of plastic waste treatment. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of this utility model is to propose a low-energy plastic waste pyrolysis device that can process plastic waste with low energy consumption and high efficiency, thereby reducing the processing cost of plastic waste.

[0006] To solve the above-mentioned technical problems, this utility model provides a low-energy plastic waste pyrolysis equipment, including a furnace body, a reflux cylinder, a heating device, a feeding device, and a screening plate;

[0007] The feeding device is connected to the feeding end of the furnace body. The feeding device is used to feed the plastic waste to be treated and the heat-conducting balls into the furnace body. The heating device is installed on the outside of the furnace body. The heating device is used to heat the furnace body, so that the plastic waste to be treated undergoes pyrolysis to form oil and gas and pyrolysis waste residue. The heat-conducting balls are heat storage balls and / or pyrolysis catalyst balls.

[0008] The reflux cylinder is fixedly installed inside the furnace body, and a pyrolysis channel is formed between the furnace body and the reflux cylinder;

[0009] The inner wall of the furnace body is provided with a first spiral blade, and the first spiral blade is located in the pyrolysis channel; the inner wall of the reflux cylinder is provided with a second spiral blade, and the spiral directions of the first spiral blade and the second spiral blade are opposite, so that when the furnace body rotates, the material conveying directions of the first spiral blade and the second spiral blade are opposite.

[0010] The reflux cylinder has a heat-conducting ball inlet on one side near the discharge end of the furnace body. The sieve plate is installed in the pyrolysis channel. One end of the sieve plate is connected to the inner wall of the furnace body, and the other end of the sieve plate passes through the heat-conducting ball inlet and is connected to the inner wall of the reflux cylinder. The diameter of the heat-conducting ball is larger than the particle size of the pyrolysis waste residue. The sieve plate is used to screen the pyrolysis waste residue and the heat-conducting ball. Under the rotation of the furnace body, the heat-conducting ball rolls down the surface of the sieve plate into the reflux cylinder. Under the push of the second spiral blade, the heat-conducting ball is transported along the reflux cylinder to the feed end of the furnace body.

[0011] As an improvement to the above technical solution, the starting end of the first spiral blade is connected to the feed inlet of the furnace body, and the ending end of the first spiral blade is connected to the discharge outlet of the furnace body.

[0012] The starting end of the second spiral blade is connected to the heat-conducting ball inlet of the reflux cylinder, and the ending end of the second spiral blade is connected to the outlet of the reflux cylinder.

[0013] The heat-conducting ball inlet is located on the side wall of the reflux cylinder, and the screening plate is arranged perpendicular to the reflux cylinder. One end of the screening plate, which is connected to the inner wall of the reflux cylinder, extends to the starting end of the second spiral blade. The other end of the screening plate is connected to the inner wall of the furnace body corresponding to the heat-conducting ball inlet.

[0014] As an improvement to the above technical solution, the low-energy plastic waste pyrolysis equipment also includes a rotary drive device, which is connected to the furnace body for transmission and is used to drive the furnace body to rotate along the axial direction.

[0015] As an improvement to the above technical solution, the low-energy plastic waste pyrolysis equipment also includes a buffer chamber and a slag discharge device;

[0016] The pyrolysis product input end of the buffer chamber is connected to the discharge end of the furnace body, the pyrolysis waste output end of the buffer chamber is connected to the feed end of the slag discharge device, and the oil and gas output end of the buffer chamber is connected to an external oil and gas recovery and treatment device.

[0017] As an improvement to the above technical solution, the diameter of the heat-conducting ball is 2cm to 10cm.

[0018] As an improvement to the above technical solution, the heat storage ball is a corundum heat storage ball and / or a high-alumina heat storage ball.

[0019] As an improvement to the above technical solution, the pyrolysis catalyst ball includes a spherical mesh shell and a pyrolysis catalyst contained in the spherical mesh shell, wherein the size of the pyrolysis catalyst is larger than the size of the through holes in the spherical mesh shell;

[0020] The diameter of the spherical mesh shell is 2cm to 10cm.

[0021] As an improvement to the above technical solution, the rotary drive device includes a first gear, a second gear, and a drive mechanism. The first gear is fixedly sleeved on the outer periphery of the furnace body. The first gear and the second gear mesh with each other. The drive mechanism is connected to the second gear in a transmission manner. The drive mechanism is used to drive the second gear to rotate.

[0022] As an improvement to the above technical solution, both the feeding device and the slag discharge device are screw conveyors.

[0023] As an improvement to the above technical solution, the heating device heats the furnace body through a heating medium;

[0024] The heating medium is hot air, superheated steam, or heated molten salt.

[0025] Implementing this utility model has the following beneficial effects:

[0026] 1. This invention creatively designs a pyrolysis device with a special structure that can cleverly send the heat-conducting balls, which have been moved to the discharge end of the furnace body and store high heat, back to the feed end of the furnace body and mix with the newly added plastic waste. Through the dual heating effect of the heat-conducting balls inside the furnace body and external heating, the plastic waste with poor thermal conductivity can be rapidly heated up and reach the pyrolysis conditions in a shorter time. This can make full use of thermal energy and effectively reduce the heating temperature of the external heating device of the furnace body, thereby achieving low-energy consumption and high-efficiency processing of plastic waste, reducing the processing cost of plastic waste, and promoting the industrialization of plastic waste treatment.

[0027] 2. The pyrolysis equipment designed in this invention has a relatively simple structure, low manufacturing cost, and can achieve large-scale processing, greatly improving the scale and efficiency of waste treatment, and has great economic and practical value.

[0028] 3. The high-temperature oil and gas produced by pyrolysis can be recycled and processed to obtain pyrolysis oil with "recycling properties", which can be used to produce recycled plastics and has extremely high economic value, thereby greatly promoting the recycling of low-value plastics. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a low-energy plastic waste pyrolysis device in one embodiment of the present invention;

[0030] Figure 2 yes Figure 1 A partially enlarged view of the low-energy plastic waste pyrolysis equipment shown;

[0031] Figure 3 yes Figure 1 The diagram shows the working state of the low-energy plastic waste pyrolysis equipment during the screening of heat-conducting balls and pyrolysis waste residue.

[0032] In the diagram: 1. Furnace body; 2. Reflux cylinder; 3. Heating device; 4. Feeding device; 5. Slag discharge device; 6. Screening plate; 7. Pyrolysis channel; 8. Buffer chamber; 11. First spiral blade; 21. Second spiral blade; 22. Heat-conducting ball feed inlet; 31. Heating medium; 32. Heating cavity; 81. Pyrolysis product input end; 82. Pyrolysis waste output end; 83. Oil and gas output end; 101. Heat-conducting ball; 102. Pyrolysis waste. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0034] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] like Figures 1 to 3 As shown, this embodiment discloses a low-energy plastic waste pyrolysis device, including a furnace body 1, a reflux cylinder 2, a heating device 3, a feeding device 4, and a screen plate 6;

[0037] The feeding device 4 is connected to the feeding end of the furnace body 1. The feeding device 4 is used to feed the plastic waste to be processed and the heat-conducting balls into the furnace body 1. The heating device 3 is installed on the outside of the furnace body 1. The heating device 3 is used to heat the furnace body 1, so that the plastic waste to be processed undergoes pyrolysis to form oil and gas and pyrolysis waste residue. The heat-conducting balls are heat storage balls and / or pyrolysis catalyst balls.

[0038] The reflux cylinder 2 is fixedly installed inside the furnace body 1, and a pyrolysis channel 7 is provided between the furnace body 1 and the reflux cylinder;

[0039] The inner wall of the furnace body 1 is provided with a first spiral blade 11, and the first spiral blade 11 is located in the pyrolysis channel 7; the inner wall of the reflux cylinder 2 is provided with a second spiral blade 21, and the spiral directions of the first spiral blade 11 and the second spiral blade 21 are opposite, so that when the furnace body 1 rotates, the material conveying directions of the first spiral blade 11 and the second spiral blade 21 are opposite, that is, the material conveying directions in the pyrolysis channel 7 and the reflux cylinder 2 are opposite;

[0040] The reflux cylinder 2 has a heat-conducting ball inlet 22 on one side near the discharge end of the furnace body 1. The sieve plate 6 is installed in the pyrolysis channel 7. One end of the sieve plate 6 is connected to the inner wall of the furnace body 1, and the other end of the sieve plate 6 passes through the heat-conducting ball inlet 22 and is connected to the inner wall of the reflux cylinder 2. The diameter of the heat-conducting ball is larger than the particle size of the pyrolysis waste residue. The sieve plate 6 is used to sieve the pyrolysis waste residue and the heat-conducting ball. Under the rotation of the furnace body 1, the heat-conducting ball rolls down along the surface of the sieve plate 6 and through the heat-conducting ball inlet 22 into the reflux cylinder 2. Under the push of the second spiral blade 21, the heat-conducting ball is transported along the reflux cylinder to the feed end of the furnace body 1.

[0041] It is worth noting that the present invention creatively designs a pyrolysis device with a special structure. By setting a reflux cylinder 2 inside the furnace body 1, and setting a first spiral blade 11 and a second spiral blade 21 with opposite rotation directions on the inner walls of the furnace body 1 and the reflux cylinder 2, the material conveying directions in the pyrolysis channel 7 and the reflux cylinder 2 are opposite when the furnace body 1 rotates. A screening plate 6 for screening pyrolysis waste and heat-conducting balls is set near the discharge port of the furnace body 1. The high-temperature heat-conducting balls, which have stored a lot of heat after being heated by the pyrolysis channel 7, can be screened by the screening plate 6 and roll down to the feed end of the reflux cylinder 2 (i.e., the end near the discharge end of the furnace body 1). Then, they are conveyed to the discharge end of the reflux cylinder 2 by the pushing action of the second spiral blade 21 in the reflux cylinder 2, and fall from the discharge port of the reflux cylinder 2 to the feed end of the furnace body 1. This invention ingeniously transfers high-temperature heat-conducting balls, which store a large amount of energy, to the feed end of the furnace body 1 via a reflux cylinder 2, where they mix with the newly added plastic waste. Under the dual effects of external heating and heat transfer from the heat-conducting balls, the poorly conductive plastic waste can rapidly heat up, reaching pyrolysis conditions in a short time. Therefore, compared to traditional pyrolysis equipment, the pyrolysis equipment of this invention can fully utilize thermal energy, accelerate the heating of plastic waste, and reduce the external heating temperature of the furnace body 1. This enables low-energy and high-efficiency processing of plastic waste, reduces processing costs, and promotes the industrialization of plastic waste treatment.

[0042] To further explain, in the later stages of pyrolysis, the pyrolysis of plastic waste itself has limited heat absorption. However, due to external heating, heat is continuously transferred in, causing the temperature inside the furnace body 1 to rise significantly. The heat-conducting spheres can store excess energy, which can heat the spheres to a very high temperature. Therefore, when the heat-conducting spheres are returned to the feed end of the furnace body 1, the high-temperature spheres can heat the newly arriving plastic waste inside the furnace body 1, significantly increasing the heating rate of the plastic waste.

[0043] In some embodiments, the operation process of the low-energy plastic waste pyrolysis equipment is as follows:

[0044] (1) When the furnace body 1 rotates, the spiral direction of the first spiral blade 11 on the inner wall of the furnace body 1 is forward (i.e. towards the discharge end close to the furnace body 1), and the material (plastic waste and heat-conducting balls) in the pyrolysis channel 7 will move forward as the furnace body 1 rotates;

[0045] (2) The spiral direction of the second spiral blade 21 in the reflux cylinder 2 is backward (i.e. towards the feed end close to the furnace body 1). Since the reflux cylinder 2 and the furnace body 1 are fixedly connected, when the furnace body 1 rotates, the reflux cylinder 2 rotates synchronously, causing the heat-conducting ball that enters the reflux cylinder 2 to move backward with the rotation of the second spiral blade 21.

[0046] (3) After the waste to be processed enters the furnace body 1, it first comes into contact with and mixes with the high-temperature heat-conducting balls that are returned through the return tube 2. Then, in the pyrolysis channel 7, it moves forward together with the first spiral blade 11 and is heated by the inner wall of the furnace body 1 under the heating of the heating device 3.

[0047] (4) The plastic waste to be processed is heated rapidly under the dual heating of the high-temperature heat-conducting ball and the inner wall of the furnace body 1, and reaches the pyrolysis temperature to carry out thermal decomposition.

[0048] (5) Under the rotation of the furnace body 1, the plastic waste moves forward continuously so as to be pyrolyzed. When it finally reaches the discharge end of the furnace body 1, the remaining pyrolysis waste residue (powdered carbon residue) and heat-conducting balls that cannot be pyrolyzed may also contain a small amount of inorganic matter such as slag (powdered) brought in with the waste.

[0049] (6) Because the discharge end of the furnace body 1 is equipped with a screening plate 6 connecting the furnace body 1 and the return cylinder 2, and because the particle size of the heat-conducting balls is larger than the particle size of the pyrolysis waste residue, after the pyrolysis waste residue (powdered) and the heat-conducting balls are screened through the screening plate 6, the powdered pyrolysis waste residue falls onto the furnace body 1. Under the rotation of the furnace body 1, the first spiral blade 11 pushes the pyrolysis waste residue forward until it is discharged outside the furnace body 1; because the screening plate 6 moves with the rotation of the furnace body 1... As the screen plate 6 rotates, the heat-conducting balls roll along the surface of the screen plate 6 toward the reflux cylinder 2, and finally roll into the reflux cylinder 2 through the heat-conducting ball inlet 22. The heat-conducting balls entering the reflux cylinder are transported to the outlet of the reflux cylinder 2 by the second spiral blade 21, driven by the reflux cylinder rotating synchronously with the furnace body 1, and fall from the outlet of the reflux cylinder 2 to the feed end of the furnace body 1, so that the heat-conducting balls can continue to be recycled.

[0050] In one embodiment, the starting end of the first helical blade 11 is connected to the feed inlet of the furnace body 1, and the ending end of the first helical blade 11 is connected to the discharge outlet of the furnace body 1.

[0051] The starting end of the second spiral blade 21 is connected to the heat-conducting ball inlet 22 of the reflux cylinder 2, and the ending end of the second spiral blade 21 is connected to the outlet of the reflux cylinder 2.

[0052] The heat-conducting ball inlet 22 is located on the side wall of the reflux cylinder 2. The screening plate 6 is perpendicular to the reflux cylinder 2. One end of the screening plate 6, which is connected to the inner wall of the reflux cylinder 2, extends to the starting end of the second spiral blade 21. The other end of the screening plate 6 is connected to the inner wall of the furnace body 1 corresponding to the heat-conducting ball inlet 22. When the material (a mixture of pyrolysis waste and heat-conducting balls) in the pyrolysis channel 7 reaches the position of the screening plate 6 under the push of the first spiral blade 11, the screening plate 6 rotates with the furnace body 1 to separate the pyrolysis waste and the heat-conducting balls. The screened heat-conducting balls move above the screening plate 6 towards the heat-conducting ball inlet 22 and finally enter the reflux cylinder 2 from the heat-conducting ball inlet 22. The heat-conducting balls that have entered the reflux cylinder 2 can return to the feed end of the furnace body 1 under the push of the second spiral blade 21.

[0053] Preferably, the sieve plate 6 is arc-shaped, which allows the heat-conducting balls to enter the return cylinder 2 better and prevents the heat-conducting balls from falling back onto the furnace body 1 from both sides of the sieve plate 6 when it rotates.

[0054] In one embodiment, the low-energy plastic waste pyrolysis equipment further includes a rotary drive device (not shown in the figure), which is connected to the furnace body 1 and drives the furnace body 1 to rotate axially. The rotary drive device drives the furnace body 1 to rotate axially, thereby causing the return cylinder 2 to rotate synchronously. Since the rotation direction of the first spiral blade 11 in the furnace body 1 is opposite to that of the second spiral blade 21 in the return cylinder 2, the materials in the furnace body 1 and the return cylinder 2 can move in opposite directions. Therefore, by controlling the rotation direction of the furnace body 1 through the rotary drive device, the materials in the furnace body 1 can move towards the discharge end of the furnace body 1 under the push of the first spiral blade 11, while the materials in the return cylinder 2 can move towards the feed end of the furnace body 1 under the push of the second spiral blade 21. This allows the high-temperature heat-conducting balls to return to the feed end of the furnace body 1, achieving recycling and heating the plastic waste inside the pyrolysis channel 7.

[0055] Specifically, the rotary drive device can be an existing drive device that can drive the pyrolysis furnace to rotate.

[0056] In one embodiment, the low-energy plastic waste pyrolysis equipment further includes a buffer chamber 8 and a slag discharge device 5;

[0057] The pyrolysis product input end 81 of the buffer chamber 8 is connected to the discharge end of the furnace body 1, allowing the filtered pyrolysis waste residue to be discharged into the buffer chamber 8 for temporary storage. The pyrolysis waste residue output end 82 of the buffer chamber 8 is connected to the feed end of the slag discharge device 5, allowing the pyrolysis waste residue to be discharged to a designated location. The oil and gas output end 83 of the buffer chamber 8 is connected to an external oil and gas recovery and treatment device. This allows the oil and gas generated by pyrolysis to flow to the oil and gas recovery and treatment device, where high-value pyrolysis oil and combustible gas can be obtained, thereby improving economic efficiency.

[0058] Because the pyrolysis furnace has a relatively large diameter (1-4 meters) and a large internal space, the large amount of oil and gas generated by rapid pyrolysis can be quickly discharged into the buffer chamber 8. From there, the oil and gas exit end of the buffer chamber 8 enters the external oil and gas recovery and treatment device (oil and gas condensation separation device) for separation, thus obtaining pyrolysis oil and non-condensable gas. The pyrolysis oil is recycled as a product, and the non-condensable gas can be used to generate hot air through a burner, which can then be used to heat the furnace body 1, further reducing the cost of plastic waste treatment.

[0059] In one embodiment, the diameter of the heat-conducting ball is 2cm to 10cm.

[0060] It is worth noting that the pyrolysis waste residue formed by the full pyrolysis of plastic waste in the pyrolysis channel 7 is usually powdery carbon slag with a particle size of less than 1 mm. In this embodiment, heat-conducting balls with a diameter of 2 cm to 10 cm are used, which have better heat conduction effect and are conducive to rapidly heating up the plastic waste with poor thermal conductivity to reach the pyrolysis conditions. Moreover, the size difference between the pyrolysis waste residue and the heat-conducting balls is large, which is conducive to screening the pyrolysis waste residue and the heat-conducting balls. By selecting a screening orifice plate 6 of appropriate size, the pyrolysis waste residue can be fully separated.

[0061] In one embodiment, the heat storage ball is a corundum heat storage ball and / or a high-alumina heat storage ball. Both corundum and high-alumina heat storage balls have excellent thermal conductivity, effectively absorbing excess energy in the pyrolysis equipment and releasing heat when they come into contact with plastic waste, accelerating the heating of the plastic waste. Therefore, they can effectively reduce energy consumption, improve energy utilization efficiency, and save energy costs. Furthermore, corundum and high-alumina heat storage balls have good stability and durability, are not easily corroded or damaged, and can be used repeatedly for a long time.

[0062] In one embodiment, the pyrolysis catalyst ball includes a spherical mesh shell and a pyrolysis catalyst contained in the spherical mesh shell. Using a spherical mesh shell to contain the pyrolysis catalyst ensures that the pyrolysis catalyst is in contact with the plastic waste, thereby promoting the pyrolysis of the plastic waste and improving the pyrolysis efficiency. The size of the pyrolysis catalyst is larger than the size of the through holes in the spherical mesh shell, ensuring that the pyrolysis catalyst can always be stored in the spherical mesh shell and will not escape from the through holes of the spherical mesh shell.

[0063] The diameter of the spherical mesh shell is 2cm to 10cm.

[0064] Specifically, the pyrolysis catalyst is a molecular sieve catalyst suitable for the pyrolysis of plastic waste. Commercially available catalysts commonly used in plastic pyrolysis can be used, such as zeolite catalysts and metal oxide catalysts. These catalysts can promote the decomposition of plastic macromolecules and store heat, which can then be used to heat plastic waste with poor thermal conductivity.

[0065] Preferably, the pyrolysis catalyst is in the form of spheres, strips, or long particles.

[0066] In one embodiment, the rotary drive device includes a first gear (not shown in the figure), a second gear (not shown in the figure), and a drive mechanism (not shown in the figure). The first gear is fixedly sleeved on the outer periphery of the furnace body 1. The first gear and the second gear mesh with each other. The drive mechanism is connected to the second gear in a transmission manner. The drive mechanism is used to drive the second gear to rotate, thereby driving the first gear to rotate, and then driving the furnace body 1 to rotate.

[0067] Preferably, the drive mechanism can be a geared motor.

[0068] In one embodiment, both the feeding device 4 and the slag discharge device 5 are screw conveyors.

[0069] In one embodiment, the heating device 3 heats the furnace body 1 through the heating medium 31;

[0070] The heating medium 31 is hot air, superheated steam, or heated molten salt. The furnace body 1 can be heated by introducing the heating medium 31 into the heating cavity 32 outside the furnace body 1.

[0071] Preferably, dynamic sealing devices are provided at the connection between the furnace body 1 and the feeding device 4, as well as at the connection between the furnace body 1 and the buffer chamber 8, to prevent high-temperature oil and gas leakage.

[0072] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A low-energy plastic waste pyrolysis device, characterized in that, It includes the furnace body, reflux cylinder, heating device, feeding device, and screening plate; The feeding device is connected to the feeding end of the furnace body. The feeding device is used to put the plastic waste to be processed or the heat-conducting ball into the furnace body. The heating device is installed on the outside of the furnace body and is used to heat the furnace body so that the plastic waste to be processed undergoes pyrolysis to form oil and gas and pyrolysis waste residue. The reflux cylinder is fixedly installed inside the furnace body, and a pyrolysis channel is formed between the furnace body and the reflux cylinder; The inner wall of the furnace body is provided with a first spiral blade, and the first spiral blade is located in the pyrolysis channel; the inner wall of the reflux cylinder is provided with a second spiral blade. The reflux cylinder has a heat-conducting ball inlet on one side near the discharge end of the furnace body. The sieve plate is installed in the pyrolysis channel. One end of the sieve plate is connected to the inner wall of the furnace body, and the other end of the sieve plate passes through the heat-conducting ball inlet and is connected to the inner wall of the reflux cylinder. Under the rotation of the furnace body, the heat-conducting balls roll down the surface of the sieve plate into the reflux cylinder. Driven by the second spiral blades, the heat-conducting balls are transported along the reflux cylinder to the feed end of the furnace body.

2. The low-energy plastic waste pyrolysis equipment according to claim 1, characterized in that, The first and second spiral blades rotate in opposite directions, so that when the furnace body rotates, the material conveying directions of the first and second spiral blades are opposite.

3. The low-energy plastic waste pyrolysis equipment according to claim 2, characterized in that, The starting end of the first spiral blade is connected to the feed inlet of the furnace body, and the ending end of the first spiral blade is connected to the discharge outlet of the furnace body. The starting end of the second spiral blade is connected to the heat-conducting ball inlet of the reflux cylinder, and the ending end of the second spiral blade is connected to the outlet of the reflux cylinder. The heat-conducting ball inlet is located on the side wall of the reflux cylinder, and the screening plate is arranged perpendicular to the reflux cylinder. One end of the screening plate, which is connected to the inner wall of the reflux cylinder, extends to the starting end of the second spiral blade. The other end of the screening plate is connected to the inner wall of the furnace body corresponding to the heat-conducting ball inlet.

4. The low-energy plastic waste pyrolysis equipment according to claim 1, characterized in that, The low-energy plastic waste pyrolysis equipment also includes a rotary drive device, which is connected to the furnace body for transmission. The rotary drive device is used to drive the furnace body to rotate along the axial direction.

5. The low-energy plastic waste pyrolysis equipment according to claim 1, characterized in that, The low-energy plastic waste pyrolysis equipment also includes a buffer chamber and a slag discharge device; The pyrolysis product input end of the buffer chamber is connected to the discharge end of the furnace body, the pyrolysis waste output end of the buffer chamber is connected to the feed end of the slag discharge device, and the oil and gas output end of the buffer chamber is connected to an external oil and gas recovery and treatment device.

6. The low-energy plastic waste pyrolysis equipment according to claim 1, characterized in that, The heat-conducting sphere is a heat storage sphere and / or a pyrolysis catalyst sphere; The diameter of the heat-conducting ball is 2cm to 10cm, which is larger than the particle size of the pyrolysis waste residue.

7. The low-energy plastic waste pyrolysis equipment according to claim 6, characterized in that, The heat storage ball is a corundum heat storage ball and / or a high-alumina heat storage ball; The pyrolysis catalyst ball includes a spherical mesh shell and a pyrolysis catalyst contained in the spherical mesh shell, wherein the size of the pyrolysis catalyst is larger than the size of the through holes in the spherical mesh shell; The diameter of the spherical mesh shell is 2cm to 10cm.

8. The low-energy plastic waste pyrolysis equipment according to claim 4, characterized in that, The rotary drive device includes a first gear, a second gear, and a drive mechanism. The first gear is fixedly sleeved on the outer periphery of the furnace body. The first gear and the second gear mesh with each other. The drive mechanism is connected to the second gear in a transmission manner. The drive mechanism is used to drive the second gear to rotate.

9. The low-energy plastic waste pyrolysis equipment according to claim 5, characterized in that, Both the feeding device and the slag discharge device are screw conveyors.

10. The low-energy plastic waste pyrolysis equipment according to claim 1, characterized in that, The heating device heats the furnace body through a heating medium; The heating medium is hot air, superheated steam, or heated molten salt.

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