Low-energy waste tire pyrolysis system and method

Abstract

The invention provides a low-energy-consumption waste tire pyrolysis system and method, and relates to the technical field of waste tire treatment.The low-energy-consumption waste tire pyrolysis system comprises a pyrolysis furnace, a screening device and a conveying unit, the pyrolysis furnace is provided with a pyrolysis cavity, a first inlet and a pyrolysis carbon black outlet, the first inlet and the pyrolysis carbon black outlet are communicated with the pyrolysis cavity, and the pyrolysis cavity is used for pyrolyzing waste tire materials; the screening device is communicated with the pyrolytic carbon black outlet and is used for screening the pyrolytic carbon black, and the screening device is provided with a coarse carbon black outlet; the coarse carbon black outlet, the conveying unit and the first inlet are sequentially communicated, so that coarse carbon black flows back to the pyrolysis cavity and is mixed with the waste tire material for pyrolysis. Crude carbon black can be screened out from pyrolytic carbon black obtained after pyrolysis of waste tire materials, and then the crude carbon black flows back to the pyrolysis cavity to be mixed with the waste tire materials for joint pyrolysis, so that energy consumption in the pyrolysis process is effectively reduced, heat and mass transfer efficiency is improved, and the pyrolysis complete degree of the waste tire materials is ensured by means of heat and heat conduction performance of the crude carbon black.

Description

Technical Field

[0001] The present invention relates to the technical field of waste tire treatment, and in particular to a low-energy consumption waste tire pyrolysis system and method. Background Art

[0002] Waste tires are highly polluting solid waste. With the rapid growth in waste tire production, the environmental pollution they cause is becoming increasingly severe. Among waste tire treatment methods, pyrolysis technology has become the primary method for waste tire disposal because it can achieve large-scale, harmless, and resource-efficient disposal.

[0003] However, the large-scale promotion and application of waste tire pyrolysis technology is limited due to the high energy consumption in the crushing, pulverization and pyrolysis processes of waste tires, and the relatively large thermal resistance of waste tires themselves, which easily affects the heat and mass transfer efficiency. Summary of the Invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of one aspect of the present invention proposes a low-energy waste tire pyrolysis system. The low-energy waste tire pyrolysis system can screen out coarse carbon black from the pyrolysis carbon black after pyrolysis of the waste tire material, and return the coarse carbon black to the pyrolysis chamber to mix with the waste tire material for co-pyrolysis. The heat and thermal conductivity of the coarse carbon black are utilized to effectively reduce the energy consumption in the pyrolysis process, improve the heat and mass transfer efficiency, and ensure the complete pyrolysis of the waste tire material.

[0006] Another aspect of the present invention provides a low-energy waste tire pyrolysis method.

[0007] According to an embodiment of the present invention, a low-energy waste tire pyrolysis system includes a pyrolysis furnace, a screening device, and a conveying unit. The pyrolysis furnace has a pyrolysis chamber and is provided with a first inlet and a pyrolysis carbon black outlet connected to the pyrolysis chamber. The pyrolysis chamber is used to pyrolyze waste tire materials; the screening device is connected to the pyrolysis carbon black outlet and is used to screen pyrolysis carbon black. The screening device is provided with a coarse carbon black outlet; the coarse carbon black outlet, the conveying unit, and the first inlet are connected in sequence so that the coarse carbon black flows back to the pyrolysis chamber and is mixed with the waste tire material for pyrolysis.

[0008] According to the low-energy waste tire pyrolysis system of the embodiment of the present invention, the pyrolysis chamber of the pyrolysis furnace can pyrolyze the waste tire material to obtain pyrolytic carbon black and oil-gas mixture, wherein the pyrolytic carbon black is passed through the screening device for screening to obtain coarse carbon black and high-value carbon black, and the coarse carbon black is transported back to the pyrolysis chamber by the conveying unit and mixed with the waste tire material in the pyrolysis chamber so that the heat of the coarse carbon black can be used to assist in the pyrolysis of the two, thereby reducing the total energy consumption required in the pyrolysis process. At the same time, since the hardness and thermal conductivity of the coarse carbon black are higher than those of the waste tire material, the coarse carbon black is used for the pyrolysis of the waste tire material. When mixed with waste tire materials and then pyrolyzed, it is beneficial to improve the heat and mass transfer efficiency of the pyrolysis furnace and the completeness of the waste tire pyrolysis, obtain high-value pyrolysis products, and thus improve the economy of the waste tire pyrolysis technology. Therefore, compared with related technologies, the present invention can screen out coarse carbon black from the pyrolysis carbon black after the pyrolysis of the waste tire materials, so that the coarse carbon black is returned to the pyrolysis chamber and mixed with the waste tire materials for pyrolysis together, so as to utilize the heat and thermal conductivity of the coarse carbon black, effectively reduce the energy consumption in the pyrolysis process, improve the heat and mass transfer efficiency, and ensure the completeness of the pyrolysis of the waste tire materials.

[0009] In some embodiments, the pyrolysis furnace is further provided with a flue gas inlet and a flue gas outlet, and the pyrolysis system further comprises a hot blast furnace, wherein the flue gas outlet of the hot blast furnace is connected to the flue gas inlet so that the pyrolysis chamber is heated by the high-temperature flue gas;

[0010] The flue gas outlet is communicated with the flue gas inlet of the conveying unit so that the conveyed crude carbon black is heated by the residual heat of the flue gas.

[0011] In some embodiments, the pyrolysis system further includes a desulfurization device and a chimney, and the smoke outlet of the conveying unit, the desulfurization device and the chimney are connected in sequence.

[0012] In some embodiments, the flue gas temperature at the flue gas outlet of the hot blast stove is 1000° C.-1200° C.;

[0013] The flue gas temperature at the flue gas outlet is 700°C-800°C;

[0014] The temperature of the crude carbon black at the outlet of the conveying unit is 600° C.-700° C.

[0015] In some embodiments, the pyrolysis furnace is further provided with a first interlayer, the first interlayer is located on the outer peripheral side of the pyrolysis chamber, and the first interlayer is provided with the flue gas inlet and the flue gas outlet;

[0016] The flow direction of the smoke in the first interlayer is consistent with the conveying direction of the waste tire material in the pyrolysis chamber.

[0017] In some embodiments, the pyrolysis furnace is further provided with an oil-gas mixture outlet connected to the pyrolysis chamber, and the pyrolysis system further comprises an oil-gas separation device, the oil-gas separation device being connected to the oil-gas mixture outlet to separate pyrolysis oil and pyrolysis gas;

[0018] The pyrolysis gas outlet of the oil-gas separation device is communicated with the fuel inlet of the hot blast furnace, so that the pyrolysis gas enters the hot blast furnace and is burned to generate high-temperature flue gas.

[0019] In some embodiments, the pyrolysis furnace is further provided with a second inlet connected to the pyrolysis chamber, and the pyrolysis system further comprises a first hopper and a first feeder, wherein the first hopper, the first feeder and the second inlet are sequentially connected, and the first hopper is used to store the waste tire material;

[0020] The particle size of the waste tire material in the first hopper is 15mm-30mm.

[0021] In some embodiments, the screening device is further provided with a high-value carbon black outlet, and the pyrolysis system further comprises a high-value carbon black storage tank, the high-value carbon black storage tank being connected to the high-value carbon black outlet to store the high-value carbon black, and the particle size of the high-value carbon black is not greater than the particle size of the coarse carbon black;

[0022] The particle size of the high-value carbon black is 0.25mm-7mm, and the particle size of the coarse carbon black is 7mm-10mm.

[0023] In some embodiments, the conveying unit includes a conveying device, a second hopper, and a second feeder.

[0024] Wherein, the conveying device has a conveying cavity for conveying the coarse carbon black;

[0025] Wherein, the coarse carbon black outlet, the conveying chamber, the second hopper, the second feeder and the first inlet are connected in sequence.

[0026] In some embodiments, the conveying device is provided with a second interlayer, the second interlayer is located on the outer peripheral side of the conveying cavity, and the second interlayer is provided with a smoke inlet of the conveying unit and a smoke outlet of the conveying unit;

[0027] The flow direction of the smoke in the second interlayer is opposite to the conveying direction of the coarse carbon black in the conveying cavity.

[0028] According to an embodiment of the present invention, a low-energy consumption waste tire pyrolysis method comprises the following steps:

[0029] Pyrolysis: sending the waste tire material into the pyrolysis chamber of the pyrolysis furnace for pyrolysis to obtain pyrolysis carbon black and oil-gas mixture;

[0030] Screening, passing the pyrolytic carbon black into a screening device, wherein the screening device screens the pyrolytic carbon black to obtain coarse carbon black and high-value carbon black;

[0031] The crude carbon black is refluxed and returned to the pyrolysis chamber by a conveying unit, where the crude carbon black is mixed with the waste tire material for pyrolysis.

[0032] The technical advantages of the low-energy waste tire pyrolysis method according to the embodiment of the present invention are the same as the technical advantages of the low-energy waste tire pyrolysis system described above, and will not be repeated here.

[0033] In some embodiments, after the pyrolysis operation, the pyrolysis method further comprises:

[0034] Separating the oil-gas mixture by passing the oil-gas mixture into an oil-gas separation device for separation to obtain pyrolysis oil and pyrolysis gas;

[0035] The pyrolysis gas is recycled by passing the pyrolysis gas into a hot blast furnace for combustion to obtain high-temperature flue gas, which is then passed into the first interlayer of the pyrolysis furnace to heat and raise the temperature of the pyrolysis chamber. The high-temperature flue gas becomes medium-temperature flue gas after heat exchange.

[0036] In some embodiments, after the screening operation, the pyrolysis method further comprises:

[0037] The high-value carbon black is collected and passed into a high-value carbon black storage tank for storage.

[0038] In some embodiments, after the pyrolysis gas recycling operation, the pyrolysis method further comprises:

[0039] The flue gas waste heat is utilized by passing the medium-temperature flue gas into the second interlayer of the conveying unit to heat and raise the temperature of the crude carbon black conveyed in the conveying cavity of the conveying unit, wherein the medium-temperature flue gas becomes low-temperature flue gas after heat exchange;

[0040] Flue gas treatment: the low-temperature flue gas enters a desulfurization device for desulfurization to obtain purified flue gas, which is discharged through a chimney.

[0041] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 2 is a schematic structural diagram of a low-energy waste tire pyrolysis system according to an embodiment of the present invention.

[0043] Figure 2 4 is a schematic flow chart of a low-energy waste tire pyrolysis method according to an embodiment of the present invention.

[0044] Reference numerals:

[0045] 1. Pyrolysis furnace; 11. Pyrolysis chamber; 12. First inlet; 13. Pyrolysis carbon black outlet; 14. Flue gas inlet; 15. Flue gas outlet; 16. First interlayer; 17. Oil-gas mixture outlet; 18. Second inlet;

[0046] 2. Screening device; 21. Coarse carbon black outlet; 22. High-value carbon black outlet;

[0047] 3. Conveying unit; 31. Conveying device; 311. Conveying cavity; 312. Second interlayer; 32. Second hopper; 33. Second feeder;

[0048] 4. Hot air furnace;

[0049] 5. Desulfurization device; 51. Chimney;

[0050] 6. Oil and gas separation device;

[0051] 7. First hopper;

[0052] 8. First feeder;

[0053] 9. High-value carbon black storage tank. DETAILED DESCRIPTION

[0054] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0055] like Figure 1 As shown, a low-energy waste tire pyrolysis system according to an embodiment of the present invention includes a pyrolysis furnace 1, a screening device 2 and a conveying unit 3. The pyrolysis furnace 1 has a pyrolysis chamber 11 and is provided with a first inlet 12 connected to the pyrolysis chamber 11 and a pyrolysis carbon black outlet 13. The pyrolysis chamber 11 is used to pyrolyze waste tire materials; the screening device 2 is connected to the pyrolysis carbon black outlet 13 and is used to screen pyrolysis carbon black. The screening device 2 is provided with a coarse carbon black outlet 21; the coarse carbon black outlet 21, the conveying unit 3 and the first inlet 12 are connected in sequence so that the coarse carbon black flows back to the pyrolysis chamber 11 and is mixed with the waste tire materials for pyrolysis.

[0056] According to the low-energy waste tire pyrolysis system of the embodiment of the present invention, the pyrolysis chamber 11 of the pyrolysis furnace 1 can pyrolyze the waste tire material to obtain pyrolytic carbon black and oil-gas mixture, wherein the pyrolytic carbon black is passed into the screening device 2 for screening to obtain coarse carbon black and high-value carbon black, and the coarse carbon black is transported back to the pyrolysis chamber 11 by the conveying unit 3 and mixed with the waste tire material in the pyrolysis chamber 11, so that the heat of the coarse carbon black can be used to assist in the pyrolysis of the two, thereby reducing the total energy consumption required in the pyrolysis process. At the same time, because the hardness and thermal conductivity of the coarse carbon black are higher than those of the waste tire material, the coarse carbon black can be used in the pyrolysis process. When the crude carbon black is mixed with the waste tire material and then pyrolyzed, it is beneficial to improve the heat and mass transfer efficiency of the pyrolysis furnace 1 and the completeness of the waste tire pyrolysis, obtain high-value pyrolysis products, and thus improve the economy of the waste tire pyrolysis technology. Therefore, compared with the relevant technology, the present invention can screen out the crude carbon black from the pyrolysis carbon black after the waste tire material is pyrolyzed, and make the crude carbon black flow back to the pyrolysis chamber 11 and be mixed with the waste tire material for pyrolysis, so as to utilize the heat and thermal conductivity of the crude carbon black, effectively reduce the energy consumption in the pyrolysis process, improve the heat and mass transfer efficiency, and ensure the completeness of the pyrolysis of the waste tire material.

[0057] It should be noted that “waste tires” are not limited to vehicle tires such as car tires, motorcycle tires, and truck tires.

[0058] like Figure 1 As shown, in some embodiments, the pyrolysis furnace 1 is further provided with a flue gas inlet 14 and a flue gas outlet 15, and the pyrolysis system further comprises a hot blast furnace 4, the flue gas outlet of the hot blast furnace 4 is connected to the flue gas inlet 14 so that the pyrolysis chamber 11 is heated by the high-temperature flue gas.

[0059] The flue gas outlet 15 is connected to the flue gas inlet of the conveying unit 3 so that the conveyed crude carbon black can be heated by the residual heat of the flue gas.

[0060] It can be understood that the high-temperature flue gas generated by the hot blast furnace 4 can provide heat to the pyrolysis chamber 11, and after the high-temperature flue gas exchanges heat with the pyrolysis chamber 11 to become medium-temperature flue gas, the medium-temperature flue gas is then passed into the conveying unit 3 to utilize the crude carbon black to absorb the heat of the medium-temperature flue gas, that is, the crude carbon black absorbs the waste heat of the flue gas, so that the crude carbon black flowing back to the pyrolysis chamber 11 is heated to high-temperature crude carbon black, further realizing full utilization of the heat in the pyrolysis process and reducing the total energy consumption required in the pyrolysis process.

[0061] like Figure 1 As shown, in some embodiments, the pyrolysis system further includes a desulfurization device 5 and a chimney 51, and the smoke outlet of the conveying unit 3, the desulfurization device 5 and the chimney 51 are connected in sequence.

[0062] It can be understood that, combined with the above structure, the medium-temperature flue gas becomes low-temperature flue gas after heat exchange with the coarse carbon black. The low-temperature flue gas enters the desulfurization device 5 through the smoke outlet of the conveying unit 3 for desulfurization, obtains purified flue gas and is discharged from the chimney 51 to reduce the pollution of the flue gas to the external environment.

[0063] In some embodiments, the flue gas temperature at the smoke outlet of the hot blast furnace 4 is 1000°C-1200°C, for example, it can be 1000°C, 1050°C, 1100°C, 1150°C, 1200°C, etc., but is not limited to the listed values, and other unlisted values within this numerical range are also applicable.

[0064] The flue gas temperature at the flue gas outlet 15 is 700°C-800°C, for example, 700°C, 720°C, 740°C, 760°C, 780°C, 800°C, etc., but is not limited to the listed values, and other unlisted values within the numerical range are also applicable.

[0065] The temperature of the crude carbon black at the outlet of the conveying unit 3 is 600℃-700℃, for example, it can be 600℃, 620℃, 640℃, 660℃, 680℃, 700℃, etc., but it is not limited to the listed values, and other unlisted values within this numerical range are also applicable.

[0066] like Figure 1 As shown, in some embodiments, the pyrolysis furnace 1 is further provided with a first interlayer 16 . The first interlayer 16 is located on the outer peripheral side of the pyrolysis chamber 11 . The first interlayer 16 is provided with a flue gas inlet 14 and a flue gas outlet 15 .

[0067] The flow direction of the smoke in the first interlayer 16 is consistent with the conveying direction of the waste tire material in the pyrolysis chamber 11 .

[0068] It can be understood that the high-temperature flue gas is passed into the first interlayer 16 to achieve indirect heating of the waste tire material in the pyrolysis chamber 11. Since the flow direction of the flue gas in the first interlayer 16 is consistent with the conveying direction of the waste tire material in the pyrolysis chamber 11, that is, there is a co-current heat exchange between the two, the temperature of the medium-temperature flue gas at the flue gas outlet 15 can be increased while ensuring the heating effect of the waste tire material, so as to heat the crude carbon black.

[0069] like Figure 1 As shown, in some embodiments, the pyrolysis furnace 1 is further provided with an oil-gas mixture outlet 17 connected to the pyrolysis chamber 11, and the pyrolysis system further includes an oil-gas separation device 6, which is connected to the oil-gas mixture outlet 17 to separate the pyrolysis oil and the pyrolysis gas.

[0070] The pyrolysis gas outlet of the oil-gas separation device 6 is connected to the fuel inlet of the hot blast furnace 4, so that the pyrolysis gas enters the hot blast furnace 4 and burns to generate high-temperature flue gas.

[0071] It can be understood that the pyrolysis gas is introduced into the hot blast furnace 4 for combustion, thereby realizing the recycling and reuse of the pyrolysis gas, thereby fully improving the utilization rate of energy.

[0072] In addition, in combination with the above structure, it can be seen that due to the adoption of the coarse carbon black recycling scheme, the heat of the pyrolysis gas can be greatly surplus, ensuring the complete degree of pyrolysis of the waste tire material in the pyrolysis chamber 11, and the total energy consumption is low.

[0073] like Figure 1 As shown, in some embodiments, the pyrolysis furnace 1 is further provided with a second inlet 18 connected to the pyrolysis chamber 11, and the pyrolysis system further includes a first hopper 7 and a first feeder 8. The first hopper 7, the first feeder 8 and the second inlet 18 are connected in sequence, and the first hopper 7 is used to store waste tire materials.

[0074] The particle size of the waste tire material in the first hopper 7 is 15 mm to 30 mm, for example, 15 mm, 17 mm, 19 mm, 20 mm, 22 mm, 24 mm, 26 mm, 28 mm, 30 mm, etc., but is not limited to the listed values. Other values not listed within the numerical range are also applicable.

[0075] It is understandable that due to the adoption of the coarse carbon black recycling scheme, the particle size of the waste tire material can be made larger than the particle size of the waste tire material in the pyrolysis process of the related art, thereby reducing the energy consumption of the waste tire shredding device and further saving the total energy consumption of the entire pyrolysis process.

[0076] Specifically, the first hopper 7 can be a low-temperature hopper that temporarily stores the waste tire material, facilitating the transition between the pre-treatment unit (including crushing, wire drawing, and pulverization) and the pyrolysis process, thereby ensuring the continuity of the entire pyrolysis process. The first feeder 8 can be a low-temperature feeder, such as a conventional screw feeder made of carbon steel. The first feeder 8 ensures smooth delivery of the waste tire material to the pyrolysis chamber 11, ensuring the efficiency of the entire pyrolysis process.

[0077] like Figure 1 As shown, in some embodiments, the screening device 2 is further provided with a high-value carbon black outlet 22, and the pyrolysis system further includes a high-value carbon black storage tank 9, which is connected to the high-value carbon black outlet 22 to store high-value carbon black, and the particle size of the high-value carbon black is not larger than the particle size of the coarse carbon black.

[0078] The particle size of high-value carbon black is 0.25 mm to 7 mm, and may be, for example, 0.25 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, etc., but is not limited to the values listed, and other values not listed within this numerical range are also applicable. The particle size of coarse carbon black is 7 mm to 10 mm, and may be, for example, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, etc., but is not limited to the values listed, and other values not listed within this numerical range are also applicable.

[0079] It is understandable that by using coarse carbon black within the above-mentioned particle size parameter range, the heat and thermal conductivity of the coarse carbon black can be used to further optimize the pyrolysis effect of the waste tire material and reduce the total energy consumption during the pyrolysis process.

[0080] like Figure 1 As shown, in some embodiments, the conveying unit 3 includes a conveying device 31 , a second hopper 32 and a second feeder 33 .

[0081] The conveying device 31 has a conveying chamber 311 for conveying coarse carbon black.

[0082] Among them, the crude carbon black outlet 21, the conveying chamber 311, the second hopper 32, the second feeder 33 and the first inlet 12 are connected in sequence.

[0083] It can be understood that the conveying device 31, the second hopper 32 and the second feeder 33 cooperate to achieve the recycling of the crude carbon black, so as to ensure that the crude carbon black can be smoothly and continuously conveyed to the pyrolysis chamber 11 for mixing with the waste tire material for pyrolysis.

[0084] Specifically, because the crude carbon black obtained by pyrolysis has a relatively high temperature and is reheated by the medium-temperature flue gas entering the conveying unit 3, the temperature of the crude carbon black rises to 600°C-700°C. Therefore, the crude carbon black conveyed by the conveying unit 3 is relatively high in temperature. Therefore, the second hopper 32 can be a high-temperature hopper to ensure the safety of the pyrolysis process. The second feeder 33 can be a high-temperature feeder, such as a water-cooled screw feeder made of high-temperature-resistant stainless steel.

[0085] like Figure 1 As shown, in some embodiments, the conveying device 31 is provided with a second interlayer 312 , which is located on the outer peripheral side of the conveying cavity 311 , and the second interlayer 312 is provided with a smoke inlet and a smoke outlet of the conveying unit 3 .

[0086] The flow direction of the smoke in the second interlayer 312 is opposite to the conveying direction of the coarse carbon black in the conveying cavity 311 .

[0087] It can be understood that by passing the medium-temperature flue gas (i.e., the flue gas heated by the pyrolysis furnace 1) into the second interlayer 312, indirect heating of the crude carbon black in the conveying chamber 311 can be achieved, and because the flow direction of the flue gas in the second interlayer 312 is opposite to the conveying direction of the crude carbon black in the conveying chamber 311, that is, there is countercurrent heat exchange between the two, it is possible to increase the temperature of the heated crude carbon black while ensuring the heating effect of the crude carbon black.

[0088] Specifically, the conveying device 31 can adopt a water-cooled screw feeder made of high-temperature resistant stainless steel. A second interlayer 312 (i.e., a flue gas jacket) is provided outside the screw feeder to introduce the flue gas from the flue gas outlet 15 of the pyrolysis furnace 1 to heat the crude carbon black.

[0089] like Figure 2 As shown, a low-energy waste tire pyrolysis method according to an embodiment of the present invention comprises the following steps:

[0090] Step S1, pyrolysis, feeding the waste tire material into the pyrolysis chamber 11 of the pyrolysis furnace 1 for pyrolysis to obtain pyrolysis carbon black and oil-gas mixture;

[0091] Step S2, screening, passing the pyrolytic carbon black into the screening device 2, the screening device 2 screens the pyrolytic carbon black to obtain coarse carbon black and high-value carbon black;

[0092] In step S3, the crude carbon black is refluxed and is returned to the pyrolysis chamber 11 by the conveying unit 3. The crude carbon black is mixed with the waste tire material and pyrolyzed.

[0093] The technical advantages of the low-energy waste tire pyrolysis method according to the embodiment of the present invention are the same as the technical advantages of the low-energy waste tire pyrolysis system described above, and will not be repeated here.

[0094] like Figure 2 As shown, in some embodiments, after step S1, the pyrolysis method further includes:

[0095] Step S2', separating the oil-gas mixture, passing the oil-gas mixture into the oil-gas separation device 6 for separation to obtain pyrolysis oil and pyrolysis gas;

[0096] In step S3', the pyrolysis gas is recycled by passing the pyrolysis gas into the hot blast furnace 4 for combustion to obtain high-temperature flue gas, which is then passed into the first interlayer 16 of the pyrolysis furnace 1 to heat the pyrolysis chamber 11, wherein the high-temperature flue gas becomes medium-temperature flue gas after heat exchange.

[0097] like Figure 2 As shown, in some embodiments, after step S2, the pyrolysis method further includes:

[0098] Step S3 ', collecting high-value carbon black, and passing the high-value carbon black into the high-value carbon black storage tank 9 for storage.

[0099] like Figure 2 As shown, in some embodiments, after step S3', the pyrolysis method further includes:

[0100] Step S4, utilizing the waste heat of the flue gas, passing the medium-temperature flue gas into the second interlayer 312 of the conveying unit 3 to heat the crude carbon black conveyed in the conveying cavity 311 of the conveying unit 3, wherein the medium-temperature flue gas becomes low-temperature flue gas after heat exchange;

[0101] Step S5 , flue gas treatment, allows the low-temperature flue gas to enter the desulfurization device 5 for desulfurization to obtain purified flue gas, which is then discharged through the chimney 51 .

[0102] Therefore, in some embodiments of the present invention, the low-energy waste tire pyrolysis method includes step S1, step S2 and step S3; in other embodiments, the low-energy waste tire pyrolysis method includes step S1, step S2, step S2', step S3 and step S3'. It should be noted that in this embodiment, there is no limitation on the order of step S2 and step S2', and there is no limitation on the order of step S3 and step S3'; in still other embodiments, the low-energy waste tire pyrolysis method includes step S1, step S2, step S2', step S3, step S3' and step S3'. Regarding step S3", it should be noted that, in this embodiment, there is no order restriction for step S2 and step S2', and there is no order restriction for step S3, step S3', and step S3". In still other embodiments, the low-energy waste tire pyrolysis method includes step S1, step S2, step S2', step S3, step S3', step S3", step S4, and step S5. It should be noted that, in this embodiment, there is no order restriction for step S2 and step S2', and there is no order restriction for step S3, step S3', and step S3". In other words, the low-energy waste tire pyrolysis method of the present invention can be the four methods mentioned above.

[0103] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations 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 therefore should not be understood as limiting the present invention.

[0104] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0105] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0106] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0107] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0108] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A low energy consumption waste tire pyrolysis system, characterized in that: include: A pyrolysis furnace, wherein the pyrolysis furnace has a pyrolysis chamber and is provided with a first inlet and a pyrolysis carbon black outlet communicating with the pyrolysis chamber, wherein the pyrolysis chamber is used to pyrolyze waste tire materials; a screening device, the screening device being in communication with the pyrolytic carbon black outlet and being used for screening the pyrolytic carbon black, the screening device being provided with a coarse carbon black outlet; The conveying unit, the crude carbon black outlet, the conveying unit and the first inlet are connected in sequence, so that the crude carbon black flows back to the pyrolysis chamber and is mixed with the waste tire material for pyrolysis.

2. The low-energy waste tire pyrolysis system according to claim 1 is characterized in that: The pyrolysis furnace is further provided with a flue gas inlet and a flue gas outlet, and the pyrolysis system further comprises a hot blast furnace, the flue gas outlet of the hot blast furnace being connected to the flue gas inlet so as to heat the pyrolysis chamber with high-temperature flue gas; The flue gas outlet is communicated with the flue gas inlet of the conveying unit so that the conveyed crude carbon black is heated by the residual heat of the flue gas.

3. The low-energy waste tire pyrolysis system according to claim 2, characterized in that: The pyrolysis furnace is further provided with a first interlayer, the first interlayer is located on the outer peripheral side of the pyrolysis chamber, and the first interlayer is provided with the smoke inlet and the smoke outlet; The flow direction of the smoke in the first interlayer is consistent with the conveying direction of the waste tire material in the pyrolysis chamber.

4. The low-energy waste tire pyrolysis system according to claim 2, characterized in that: The pyrolysis furnace is further provided with an oil-gas mixture outlet connected to the pyrolysis chamber, and the pyrolysis system further comprises an oil-gas separation device, the oil-gas separation device being connected to the oil-gas mixture outlet to separate pyrolysis oil and pyrolysis gas; The pyrolysis gas outlet of the oil-gas separation device is communicated with the fuel inlet of the hot blast furnace, so that the pyrolysis gas enters the hot blast furnace and is burned to generate high-temperature flue gas.

5. The low-energy waste tire pyrolysis system according to claim 1, characterized in that: The pyrolysis furnace is further provided with a second inlet connected to the pyrolysis chamber, and the pyrolysis system further comprises a first hopper and a first feeder, wherein the first hopper, the first feeder and the second inlet are connected in sequence, and the first hopper is used to store the waste tire material; The particle size of the waste tire material in the first hopper is 15mm-30mm.

6. The low-energy waste tire pyrolysis system according to claim 1, characterized in that: The conveying unit includes: a conveying device having a conveying chamber for conveying the coarse carbon black; The second hopper and the second feeder, the crude carbon black outlet, the conveying chamber, the second hopper, the second feeder and the first inlet are connected in sequence.

7. The low-energy waste tire pyrolysis system according to claim 6, characterized in that: The conveying device is provided with a second interlayer, the second interlayer is located on the outer peripheral side of the conveying cavity, and the second interlayer is provided with a smoke inlet of the conveying unit and a smoke outlet of the conveying unit; The flow direction of the smoke in the second interlayer is opposite to the conveying direction of the coarse carbon black in the conveying cavity.

8. A low-energy waste tire pyrolysis method, characterized in that: The pyrolysis method comprises the following steps: Pyrolysis: sending the waste tire material into the pyrolysis chamber of the pyrolysis furnace for pyrolysis to obtain pyrolysis carbon black and oil-gas mixture; Screening, passing the pyrolytic carbon black into a screening device, wherein the screening device screens the pyrolytic carbon black to obtain coarse carbon black and high-value carbon black; The crude carbon black is refluxed and returned to the pyrolysis chamber by a conveying unit, where the crude carbon black is mixed with the waste tire material for pyrolysis.

9. The low-energy waste tire pyrolysis method according to claim 8, characterized in that: After the pyrolysis operation, the pyrolysis method further comprises: Separating the oil-gas mixture by passing the oil-gas mixture into an oil-gas separation device for separation to obtain pyrolysis oil and pyrolysis gas; The pyrolysis gas is recycled by passing the pyrolysis gas into a hot blast furnace for combustion to obtain high-temperature flue gas, which is then passed into the first interlayer of the pyrolysis furnace to heat and raise the temperature of the pyrolysis chamber. The high-temperature flue gas becomes medium-temperature flue gas after heat exchange.

10. The low-energy waste tire pyrolysis method according to claim 9, characterized in that: After the pyrolysis gas recycling operation, the pyrolysis method further comprises: The flue gas waste heat is utilized by passing the medium-temperature flue gas into the second interlayer of the conveying unit to heat and raise the temperature of the crude carbon black conveyed in the conveying cavity of the conveying unit, wherein the medium-temperature flue gas becomes low-temperature flue gas after heat exchange; Flue gas treatment: the low-temperature flue gas enters a desulfurization device for desulfurization to obtain purified flue gas, which is discharged through a chimney.

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