Waste tire pyrolysis system and method

Abstract

The invention provides a waste tire pyrolysis system and method, and relates to the technical field of waste tire treatment.The waste tire pyrolysis system comprises a pyrolysis device, a conveying device, a condensation unit and a first heat exchange pipe, the pyrolysis device is provided with a pyrolysis cavity, a material inlet and a first outlet, the material inlet and the first outlet are communicated with the pyrolysis cavity, and the pyrolysis cavity is used for pyrolyzing waste tire materials; the conveying device is connected with the material inlet so as to convey waste tire materials to the pyrolysis cavity; the first outlet is communicated with the condensing unit so as to introduce a gaseous pyrolysis product into the condensing unit; the first heat exchange pipe is provided with a low-temperature side and a high-temperature side, the low-temperature side of the first heat exchange pipe is arranged in the condensation unit to cool and separate gaseous pyrolysis products, and the high-temperature side of the first heat exchange pipe is arranged at the conveying device to preheat conveyed waste tire materials. According to the invention, the heat contained in the waste tire pyrolysis product can be recovered, and the recovered waste heat is utilized to preheat the waste tire material, so that the energy consumption of the whole pyrolysis process is reduced, and the economical efficiency of the waste tire pyrolysis process is improved.

Description

Technical Field

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

[0002] Waste tires are highly polluting solid wastes that are extremely difficult to degrade naturally. Long-term stacking poses a strong fire hazard and easily pollutes the atmosphere and groundwater. Therefore, waste tires need to be recycled. Compared with other waste tire treatment methods such as refurbishment, regeneration, and incineration, the waste tire pyrolysis process not only has the advantages of large processing capacity and high product value, but also complies with the principles of resource utilization, scale and harmless treatment.

[0003] However, the waste tire pyrolysis process in the related art has high energy consumption, which limits the large-scale promotion and application of the waste tire pyrolysis process. 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 provides a waste tire pyrolysis system, which can recover the heat contained in the waste tire pyrolysis products to use the recovered waste heat to preheat the waste tire material, thereby reducing the energy consumption of the entire pyrolysis process and improving the economic efficiency of the waste tire pyrolysis process.

[0006] Another aspect of the present invention provides a method for pyrolyzing waste tires.

[0007] According to an embodiment of the present invention, a waste tire pyrolysis system includes a pyrolysis device, a conveying device, a condensing unit and a first heat exchange pipe. The pyrolysis device has a pyrolysis chamber and is provided with a material inlet and a first outlet connected to the pyrolysis chamber. The pyrolysis chamber is used to pyrolyze waste tire materials; the conveying device is connected to the material inlet to convey the waste tire materials to the pyrolysis chamber; the first outlet is connected to the condensing unit to introduce gaseous pyrolysis products into the condensing unit; the first heat exchange pipe has a low-temperature side and a high-temperature side. The low-temperature side of the first heat exchange pipe is arranged in the condensing unit to cool and separate the gaseous pyrolysis products, and the high-temperature side of the first heat exchange pipe is arranged at the conveying device to preheat the conveyed waste tire materials.

[0008] According to the waste tire pyrolysis system of the embodiment of the present invention, the conveying device can convey the waste tire material to the pyrolysis chamber through the material inlet, and the waste tire material is pyrolyzed in the pyrolysis chamber to obtain gaseous pyrolysis products and pyrolysis carbon black, wherein the gaseous pyrolysis products can enter the condensation unit through the first outlet, and the low-temperature side of the first heat exchange tube exchanges heat with the gaseous pyrolysis products in the condensation unit, and the heat absorbed by the first heat exchange tube is transferred to its high-temperature side to realize the recovery of the heat contained in the gaseous pyrolysis products. At the same time, the gaseous pyrolysis products are cooled and separated into pyrolysis oil and pyrolysis gas. Since the high-temperature side of the first heat exchange tube is located at the conveying device, the waste heat recovered by the first heat exchange tube can be used to preheat the conveyed waste tire material, thereby reducing the heat energy required for the waste tire material to reach the pyrolysis temperature when it subsequently enters the pyrolysis chamber. Compared with the related art, the present invention can recover the heat contained in the waste tire pyrolysis products, so as to use the recovered waste heat to preheat the waste tire material, thereby reducing the energy consumption of the entire pyrolysis process and improving the economy of the waste tire pyrolysis process.

[0009] In some embodiments, the pyrolysis device is further provided with a second outlet communicating with the pyrolysis chamber, and the pyrolysis system further comprises a cooler, a pyrolysis carbon black storage tank and a second heat exchange pipe.

[0010] Wherein, the second outlet, the cooler and the pyrolytic carbon black storage tank are connected in sequence;

[0011] The second heat exchange tube has a low-temperature side and a high-temperature side. The low-temperature side of the second heat exchange tube is arranged in the cooler to cool the pyrolytic carbon black, and the high-temperature side of the second heat exchange tube is arranged at the conveying device to preheat the conveyed waste tire material.

[0012] In some embodiments, the condensing unit includes a primary condenser and a secondary condenser, and the first outlet, the primary condenser, and the secondary condenser are sequentially connected;

[0013] There are two first heat exchange tubes, wherein the low-temperature side of one of the first heat exchange tubes is arranged in the primary condenser, and the low-temperature side of the other first heat exchange tube is arranged in the secondary condenser.

[0014] In some embodiments, the conveying device includes a preheating section 1, a preheating section 2, and a preheating section 3 sequentially arranged along its conveying direction, and the temperature of the preheating section 1, the temperature of the preheating section 2, and the temperature of the preheating section 3 increase sequentially;

[0015] The high temperature side of the first heat exchange tube of the secondary condenser is arranged in the preheating section 1, the high temperature side of the second heat exchange tube is arranged in the preheating section 2, and the high temperature side of the first heat exchange tube of the primary condenser is arranged in the preheating section 3.

[0016] In some embodiments, the conveying device further comprises a heating coil, wherein the heating coil is spirally arranged along the conveying direction of the conveying device, and there are three heating coils, which are sequentially arranged in the preheating section 1, the preheating section 2, and the preheating section 3;

[0017] The heating coil of the preheating section one is connected to the high-temperature side of the first heat exchange tube of the secondary condenser, the heating coil of the preheating section two is connected to the high-temperature side of the second heat exchange tube, and the heating coil of the preheating section three is connected to the high-temperature side of the first heat exchange tube of the primary condenser.

[0018] In some embodiments, the outer diameter of the heating coil is D, and D is 5 mm-57 mm;

[0019] The wall thickness of the heating coil is t, and t is 0.7 mm-3 mm;

[0020] The heating coil is a stainless steel tube.

[0021] In some embodiments, the pyrolysis device is further provided with a flue gas inlet, and the pyrolysis system further comprises a combustion chamber, wherein a flue gas outlet of the combustion chamber is connected to the flue gas inlet so as to allow high-temperature flue gas to enter the pyrolysis device to heat the pyrolysis chamber;

[0022] The fuel inlet of the combustion chamber is communicated with the pyrolysis gas outlet of the condensing unit so that the pyrolysis gas enters the combustion chamber and is burned to generate high-temperature flue gas.

[0023] In some embodiments, the pyrolysis system further includes a material storage bin, a waste tire material outlet of the material storage bin is connected to the conveying device, and the material storage bin is used to store the waste tire material.

[0024] According to an embodiment of the present invention, a waste tire pyrolysis method comprises the following steps:

[0025] Preheating: the waste tire material is transported to the pyrolysis chamber by a conveying device, and the high-temperature side of the first heat exchange tube preheats the transported waste tire material;

[0026] Pyrolysis: the preheated waste tire material enters the pyrolysis chamber for pyrolysis to obtain gaseous pyrolysis products and pyrolysis carbon black;

[0027] Condensation separation: the gaseous pyrolysis products are passed into a condensation unit, the low-temperature side of the first heat exchange tube exchanges heat with the gaseous pyrolysis products and the absorbed heat is transferred to the high-temperature side, and the gaseous pyrolysis products are cooled and separated to obtain pyrolysis oil and pyrolysis gas.

[0028] The technical advantages of the waste tire pyrolysis method according to the embodiment of the present invention are the same as the technical advantages of the above-mentioned waste tire pyrolysis system, which will not be repeated here.

[0029] In some embodiments, the waste tire material has a particle size of 10 mm to 20 mm.

[0030] In some embodiments, the preheating operation is specifically that the conveying device conveys the waste tire material to the pyrolysis chamber, wherein:

[0031] The heat exchange medium on the high temperature side of the first heat exchange tube of the secondary condenser flows in the heating coil of the preheating section 1 to preliminarily preheat the waste tire material;

[0032] The heat exchange medium on the high temperature side of the second heat exchange tube flows in the heating coil of the preheating section 2 to preheat the preliminarily preheated waste tire material for a second time;

[0033] The heat exchange medium on the high temperature side of the first heat exchange tube of the primary condenser flows in the heating coil of the preheating section three to preheat the waste tire material that has been preheated twice.

[0034] In some embodiments, after the pyrolysis operation, the pyrolysis method further comprises:

[0035] The pyrolytic carbon black is cooled by passing the pyrolytic carbon black into a cooler. The low-temperature side of the second heat exchange tube exchanges heat with the pyrolytic carbon black. The heat absorbed by the second heat exchange tube is transferred to the high-temperature side thereof. The high-temperature side of the second heat exchange tube also preheats the transported waste tire material.

[0036] The pyrolytic carbon black is collected and the cooled pyrolytic carbon black is stored in a pyrolytic carbon black storage tank.

[0037] In some embodiments, after the condensation separation operation, the pyrolysis method further comprises:

[0038] Then, the pyrolysis gas is introduced into a combustion chamber for combustion to obtain high-temperature flue gas, which is then used to heat the pyrolysis chamber.

[0039] In some embodiments, before the preheating operation, the pyrolysis method further comprises:

[0040] Pretreatment: The pretreatment unit crushes the waste tires, extracts steel wires and pulverizes them to obtain the waste tire materials, and the waste tire materials are stored in a material storage bin.

[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 waste tire pyrolysis system according to an embodiment of the present invention.

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

[0044] Reference numerals:

[0045] 1. Pyrolysis device; 11. Pyrolysis chamber; 12. Material inlet; 13. First outlet; 14. Second outlet; 15. Flue gas inlet;

[0046] 2. Conveying device; 21. Preheating section 1; 22. Preheating section 2; 23. Preheating section 3; 24. Heating coil; 25. Enclosed interlayer;

[0047] 3. Condensing unit; 31. Primary condenser; 32. Secondary condenser;

[0048] 4. The first heat exchange tube;

[0049] 5. Cooler;

[0050] 6. Pyrolytic carbon black storage tank;

[0051] 7. Second heat exchange tube;

[0052] 8. Combustion chamber;

[0053] 9. Material storage warehouse. 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 waste tire pyrolysis system according to an embodiment of the present invention includes a pyrolysis device 1, a conveying device 2, a condensing unit 3 and a first heat exchange pipe 4. The pyrolysis device 1 has a pyrolysis chamber 11 and is provided with a material inlet 12 and a first outlet 13 connected to the pyrolysis chamber 11. The pyrolysis chamber 11 is used to pyrolyze waste tire materials; the conveying device 2 is connected to the material inlet 12 to convey the waste tire materials to the pyrolysis chamber 11; the first outlet 13 is connected to the condensing unit 3 to introduce gaseous pyrolysis products into the condensing unit 3; the first heat exchange pipe 4 has a low-temperature side and a high-temperature side, or in other words, the first heat exchange pipe 4 has a cold end and a hot end. The low-temperature side of the first heat exchange pipe 4 is arranged in the condensing unit 3 to cool and separate the gaseous pyrolysis products, and the high-temperature side of the first heat exchange pipe 4 is arranged at the conveying device 2 to preheat the conveyed waste tire materials.

[0056] According to the waste tire pyrolysis system of the embodiment of the present invention, the conveying device 2 can convey the waste tire material to the pyrolysis chamber 11 through the material inlet 12. The waste tire material is pyrolyzed in the pyrolysis chamber 11 to obtain gaseous pyrolysis products and pyrolysis carbon black. The gaseous pyrolysis products can enter the condensing unit 3 through the first outlet 13, and the low-temperature side of the first heat exchange tube 4 exchanges heat with the gaseous pyrolysis products in the condensing unit 3. The heat absorbed by the first heat exchange tube 4 is transferred to its high-temperature side to realize the recovery of the heat contained in the gaseous pyrolysis products. The gaseous pyrolysis products are cooled and separated into pyrolysis oil and pyrolysis gas. Since the high-temperature side of the first heat exchange tube 4 is located at the conveying device 2, the waste heat recovered by the first heat exchange tube 4 can be used to preheat the conveyed waste tire material, thereby reducing the heat energy required for the waste tire material to reach the pyrolysis temperature when it subsequently enters the pyrolysis chamber 11. Compared with related technologies, the present invention can recover the heat contained in the waste tire pyrolysis products to preheat the waste tire material using the recovered waste heat, thereby reducing the energy consumption of the entire pyrolysis process and improving the economy of the waste tire pyrolysis process.

[0057] Specifically, the conveying device 2 may be a closed screw conveyor.

[0058] like Figure 1 As shown, in some embodiments, the pyrolysis device 1 is further provided with a second outlet 14 communicating with the pyrolysis chamber 11 , and the pyrolysis system further includes a cooler 5 , a pyrolysis carbon black storage tank 6 and a second heat exchange pipe 7 .

[0059] The second outlet 14, the cooler 5 and the pyrolytic carbon black storage tank 6 are connected in sequence.

[0060] The second heat exchange tube 7 has a low-temperature side and a high-temperature side, or in other words, a cold end and a hot end. The low-temperature side of the second heat exchange tube 7 is arranged in the cooler 5 to cool the pyrolytic carbon black, and the high-temperature side of the second heat exchange tube 7 is arranged at the conveying device 2 to preheat the conveyed waste tire material.

[0061] It can be understood that the pyrolytic carbon black can enter the cooler 5 through the second outlet 14, and the low-temperature side of the second heat exchange tube 7 exchanges heat with the pyrolytic carbon black in the cooler 5. The cooled pyrolytic carbon black can enter the pyrolytic carbon black storage tank 6 for storage, and the heat absorbed by the second heat exchange tube 7 is transferred to its high-temperature side to realize the recovery of the heat contained in the pyrolytic carbon black. Since the high-temperature side of the second heat exchange tube 7 is also located at the conveying device 2, combined with the above structure, the heat recovered by the first heat exchange tube 4 and the second heat exchange tube 7 can be used at the same time to preheat the conveyed waste tire material, further making full use of the waste heat generated during the pyrolysis process of the waste tire, so that the waste tire material can enter the pyrolysis chamber 11 for pyrolysis at a certain temperature, which greatly reduces the heat energy required for the subsequent pyrolysis of the waste tire material.

[0062] Furthermore, the temperature of the waste tire material at the outlet of the conveying device 2 can be about 200°C. In other words, the waste tire material conveyed by the conveying device 2 can be preheated from room temperature to about 200°C through the high-temperature side of the first heat exchange tube 4 and the high-temperature side of the second heat exchange tube 7. Therefore, compared with the related art, the present invention can save the heat energy required to heat the waste tire material from room temperature to about 200°C in the pyrolysis chamber 11.

[0063] The temperature of the gaseous pyrolysis product at the first outlet 13 may be 500°C-700°C, for example, 500°C, 550°C, 600°C, 650°C, 700°C, etc., but is not limited to the listed values, and other unlisted values ​​within this numerical range are also applicable.

[0064] The temperature of the pyrolysis carbon black at the second outlet 14 can be 500°C-700°C, for example, 500°C, 550°C, 600°C, 650°C, 700°C, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0065] As can be seen from the above, the temperature of the pyrolysis products of waste tire materials is relatively high. If the pyrolysis products are only collected directly, it is necessary to ensure that the pyrolysis products and collection device have high temperature resistance to ensure the safety of the pyrolysis process. This not only increases the design requirements for the collection device, but also causes a large amount of heat energy to be wasted. Therefore, the present invention recovers and reuses the heat of the pyrolysis products of waste tire materials, improves the economic efficiency of the waste tire pyrolysis process, and reduces the energy consumption of the entire pyrolysis process.

[0066] Furthermore, the heat exchange medium in the second heat exchange tube 7 can be thermal oil. The temperature of the thermal oil on the low-temperature side of the second heat exchange tube 7 can be 30°C-40°C, for example, 30°C, 32°C, 34°C, 36°C, 38°C, 40°C, etc., but is not limited to the listed values. Other values ​​not listed within this numerical range are also applicable. The temperature of the thermal oil on the high-temperature side of the second heat exchange tube 7 can be 300°C-350°C, for example, 300°C, 310°C, 320°C, 330°C, 340°C, 350°C, etc., but is not limited to the listed values. Other values ​​not listed within this numerical range are also applicable.

[0067] like Figure 1 As shown, in some embodiments, the condensing unit 3 includes a primary condenser 31 and a secondary condenser 32 , and the first outlet 13 , the primary condenser 31 and the secondary condenser 32 are connected in sequence.

[0068] There are two first heat exchange tubes 4 , the low temperature side of one first heat exchange tube 4 is arranged in the first condenser 31 , the low temperature side of the other first heat exchange tube 4 is arranged in the second condenser 32 , and the high temperature sides of the two first heat exchange tubes 4 are both arranged at the conveying device 2 .

[0069] It can be understood that the cooperation between the primary condenser 31 and the secondary condenser 32 can realize the separate collection of different pyrolysis oils in the gaseous pyrolysis products, wherein the pyrolysis oil condensed in the primary condenser 31 is approximately a mixture of residual oil, kerosene and gasoline, while the pyrolysis oil condensed in the secondary condenser 32 is a light fraction, so as to ensure that high-value pyrolysis products can be obtained from waste tires. At the same time, in the process of sequential cooling and separation of the gaseous pyrolysis products by the primary condenser 31 and the secondary condenser 32, heat recovery can also be achieved with the help of the first heat exchange tube 4.

[0070] Furthermore, the heat exchange medium in the first heat exchange tube 4 of the primary condenser 31 may be heat transfer oil, and the heat exchange medium in the first heat exchange tube 4 of the secondary condenser 32 may be water.

[0071] The low-temperature side heat transfer oil temperature of the first heat exchange tube 4 of the primary condenser 31 can be 80°C-100°C, for example, 80°C, 85°C, 90°C, 95°C, 100°C, etc., but is not limited to the listed values, and other values ​​not listed within this numerical range are also applicable. The high-temperature side heat transfer oil temperature of the first heat exchange tube 4 of the primary condenser 31 can be 300°C-350°C, for example, 300°C, 310°C, 320°C, 330°C, 340°C, 350°C, etc., but is not limited to the listed values, and other values ​​not listed within this numerical range are also applicable.

[0072] The low-temperature side heat transfer oil temperature of the first heat exchange tube 4 of the secondary condenser 32 can be 30°C-40°C, for example, 30°C, 32°C, 34°C, 36°C, 38°C, 40°C, etc., but is not limited to the listed values, and other values ​​not listed within this numerical range are also applicable. The high-temperature side heat transfer oil temperature of the first heat exchange tube 4 of the secondary condenser 32 can be 80°C-100°C, for example, 80°C, 85°C, 90°C, 95°C, 100°C, etc., but is not limited to the listed values, and other values ​​not listed within this numerical range are also applicable.

[0073] like Figure 1 As shown, in some embodiments, the conveying device 2 includes a preheating section 1 21, a preheating section 2 22 and a preheating section 3 23 arranged in sequence along its conveying direction, and the temperature of the preheating section 1 21, the temperature of the preheating section 2 22 and the temperature of the preheating section 3 23 increase in sequence.

[0074] The high temperature side of the first heat exchange tube 4 of the secondary condenser 32 is arranged in the preheating section 1 21 , the high temperature side of the second heat exchange tube 7 is arranged in the preheating section 2 22 , and the high temperature side of the first heat exchange tube 4 of the primary condenser 31 is arranged in the preheating section 3 23 .

[0075] It can be understood that the above structural design allows the heat of the recycled waste tire pyrolysis products to be used to preheat the waste tire material in stages, so as to fully utilize the waste heat generated during the waste tire pyrolysis process, realize energy cascade utilization, and reduce the energy consumption of the pyrolysis process.

[0076] In addition, since the temperature of the heat transfer oil on the high-temperature side of the first heat exchange tube 4 and the high-temperature side of the second heat exchange tube 7 of the primary condenser 31 is higher than the temperature of the heat transfer oil on the high-temperature side of the first heat exchange tube 4 of the secondary condenser 32, the above-mentioned layout is adopted when reusing the waste heat recovered by the condensing unit 3 and the cooler 5, which can effectively ensure that the preheating temperature of the waste tire material at the outlet of the conveying device 2 reaches about 200°C, thereby ensuring the utilization efficiency of the waste heat.

[0077] like Figure 1 As shown, in some embodiments, the conveying device 2 also includes a heating coil 24, which is spirally arranged along the conveying direction of the conveying device 2. There are three heating coils 24 and they are arranged in preheating section 1 21, preheating section 2 22 and preheating section 3 23 in sequence.

[0078] The heating coil 24 of preheating section 1 21 is connected to the high-temperature side of the first heat exchange tube 4 of the secondary condenser 32. The heating coil 24 of preheating section 22 is connected to the high-temperature side of the second heat exchange tube 7. The heating coil 24 of preheating section 3 23 is connected to the high-temperature side of the first heat exchange tube 4 of the primary condenser 31. In other words, the heat exchange medium circulating within the heating coil 24 in each preheating section is the heat exchange medium on the high-temperature side of the corresponding heat exchange tube, or in other words, the heating coil 24 in each preheating section is the high-temperature side of the corresponding heat exchange tube.

[0079] It can be understood that designing the preheating structure of each preheating section as a heating coil 24 structure can ensure that each preheating section in the conveying device 2 has good preheating performance for the waste tire material.

[0080] Furthermore, the outer diameter of the heating coil 24 is D, and D is 5mm-57mm, where D can be, for example, 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 57mm, etc., but is not limited to the listed values, and other unlisted values ​​within this numerical range are also applicable.

[0081] The wall thickness of the heating coil 24 is t, and t is 0.7 mm-3 mm, where t can be, for example, 0.7 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc., but is not limited to the listed values. Other values ​​not listed within this numerical range are also applicable.

[0082] The heating coil 24 is a stainless steel tube to ensure the working performance of the heating coil 24 .

[0083] Furthermore, a closed interlayer 25 is provided on the outer periphery of the casing of the screw conveyor, and a heating coil 24 is provided in the closed interlayer 25. The closed interlayer 25 structure can reduce the heat loss of the heating coil 24 to the external environment, further ensuring the utilization rate of waste heat.

[0084] like Figure 1 As shown, in some embodiments, the pyrolysis device 1 is further provided with a flue gas inlet 15 , and the pyrolysis system further includes a combustion chamber 8 , the smoke outlet of the combustion chamber 8 is connected to the flue gas inlet 15 to allow high-temperature flue gas to enter the pyrolysis device 1 to heat the pyrolysis chamber 11 .

[0085] The fuel inlet of the combustion chamber 8 is connected to the pyrolysis gas outlet of the condensing unit 3 so that the pyrolysis gas enters the combustion chamber 8 and is burned to generate high-temperature flue gas.

[0086] It can be understood that by introducing the pyrolysis gas into the combustion chamber 8 for combustion, the pyrolysis gas is recycled and reused, thereby fully improving the utilization rate of energy.

[0087] like Figure 1 As shown, in some embodiments, the pyrolysis system further includes a material storage bin 9, and the waste tire material outlet of the material storage bin 9 is connected to the conveying device 2 so that the waste tire material can enter the conveying device 2 for transportation. The material storage bin 9 is used to store the waste tire material to ensure the continuous operation of the pyrolysis system.

[0088] like Figure 2 As shown, a waste tire pyrolysis method according to an embodiment of the present invention comprises the following steps:

[0089] Step S1, preheating, the waste tire material is transported to the pyrolysis chamber 11 by the conveying device 2, and the high-temperature side of the first heat exchange tube 4 preheats the transported waste tire material;

[0090] Step S2, pyrolysis: the preheated waste tire material enters the pyrolysis chamber 11 for pyrolysis to obtain gaseous pyrolysis products and pyrolysis carbon black;

[0091] Step S3, condensation separation, the gaseous pyrolysis products are passed into the condensation unit 3, the low temperature side of the first heat exchange tube 4 exchanges heat with the gaseous pyrolysis products and the absorbed heat is transferred to the high temperature side, the gaseous pyrolysis products are cooled and separated to obtain pyrolysis oil and pyrolysis gas.

[0092] The technical advantages of the waste tire pyrolysis method according to the embodiment of the present invention are the same as the technical advantages of the above-mentioned waste tire pyrolysis system, which will not be repeated here.

[0093] In some embodiments, the waste tire material has a particle size of 10 mm to 20 mm.

[0094] In some embodiments, step S1 is specifically as follows: the conveying device 2 conveys the waste tire material to the pyrolysis chamber 11, wherein:

[0095] The heat exchange medium on the high temperature side of the first heat exchange tube 4 of the secondary condenser 32 flows in the heating coil 24 of the preheating section 1 21 to preliminarily preheat the waste tire material;

[0096] The heat exchange medium on the high temperature side of the second heat exchange tube 7 flows in the heating coil 24 of the second preheating section 22 to preheat the preliminarily preheated waste tire material for a second time;

[0097] The heat exchange medium on the high temperature side of the first heat exchange tube 4 of the primary condenser 31 flows in the heating coil 24 of the preheating section 3 23 to preheat the secondary preheated waste tire material again.

[0098] like Figure 2 As shown, in some embodiments, after step S2, the pyrolysis method further includes:

[0099] Step S3', cooling the pyrolytic carbon black. The pyrolytic carbon black is passed into the cooler 5. The low-temperature side of the second heat exchange tube 7 exchanges heat with the pyrolytic carbon black. The heat absorbed by the second heat exchange tube 7 is transferred to its high-temperature side. The high-temperature side of the second heat exchange tube 7 also preheats the transported waste tire material.

[0100] Step S4: collecting the pyrolytic carbon black. The cooled pyrolytic carbon black enters the pyrolytic carbon black storage tank 6 for storage.

[0101] like Figure 2 As shown, in some embodiments, after step S3, the pyrolysis method further includes:

[0102] In step S4', the pyrolysis gas is passed into the combustion chamber 8 for combustion to obtain high-temperature flue gas, which is then used to heat the pyrolysis chamber 11.

[0103] like Figure 2 As shown, in some embodiments, before step S1, the pyrolysis method further includes:

[0104] Step S0, pretreatment, the pretreatment unit crushes the waste tires, extracts steel wires and pulverizes them to obtain waste tire materials, and stores the waste tire materials in the material storage bin 9.

[0105] Therefore, in some embodiments of the present invention, the waste tire pyrolysis method includes step S1, step S2 and step S3; in other embodiments, the waste tire pyrolysis method includes step S1, step S2, step S3, step S3' and step S4. It should be noted that, in this embodiment, there is no order restriction for step S3 and step S3'; in still other embodiments, the waste tire pyrolysis method includes step S1, step S2, step S3, step S3', step S4 and step S4'. It should be noted that, in this embodiment, there is no order restriction for step S3 and step S3', and there is no order restriction for step S4 and step S4'; in still other embodiments, the waste tire pyrolysis method includes step S0, step S1, step S2, step S3, step S3', step S4 and step S4'. It should be noted that, in this embodiment, there is no order restriction for step S3 and step S3', and there is no order restriction for step S4 and step S4'. That is to say, the waste tire pyrolysis methods of the present invention can be the above four methods.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] 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 waste tire pyrolysis system, characterized in that: include: A pyrolysis device, wherein the pyrolysis device has a pyrolysis chamber and is provided with a material inlet and a first outlet communicating with the pyrolysis chamber, wherein the pyrolysis chamber is used to pyrolyze waste tire materials; a conveying device connected to the material inlet to convey the waste tire material to the pyrolysis chamber; a condensing unit, wherein the first outlet is in communication with the condensing unit to introduce gaseous pyrolysis products into the condensing unit; A first heat exchange tube, wherein the first heat exchange tube has a low-temperature side and a high-temperature side. The low-temperature side of the first heat exchange tube is arranged in the condensing unit to cool and separate the gaseous pyrolysis products, and the high-temperature side of the first heat exchange tube is arranged at the conveying device to preheat the conveyed waste tire material.

2. The waste tire pyrolysis system according to claim 1, characterized in that: The pyrolysis device is further provided with a second outlet communicating with the pyrolysis chamber, and the pyrolysis system further comprises: A cooler and a pyrolytic carbon black storage tank, wherein the second outlet, the cooler and the pyrolytic carbon black storage tank are connected in sequence; The second heat exchange tube has a low-temperature side and a high-temperature side. The low-temperature side of the second heat exchange tube is arranged in the cooler to cool the pyrolytic carbon black, and the high-temperature side of the second heat exchange tube is arranged at the conveying device to preheat the conveyed waste tire material.

3. The waste tire pyrolysis system according to claim 2, characterized in that: The condensing unit includes a primary condenser and a secondary condenser, and the first outlet, the primary condenser and the secondary condenser are connected in sequence; There are two first heat exchange tubes, wherein the low-temperature side of one of the first heat exchange tubes is arranged in the primary condenser, and the low-temperature side of the other first heat exchange tube is arranged in the secondary condenser.

4. The waste tire pyrolysis system according to claim 3, characterized in that: The conveying device includes a preheating section 1, a preheating section 2, and a preheating section 3 arranged in sequence along the conveying direction thereof, wherein the temperature of the preheating section 1, the temperature of the preheating section 2, and the temperature of the preheating section 3 increase in sequence; The high temperature side of the first heat exchange tube of the secondary condenser is arranged in the preheating section 1, the high temperature side of the second heat exchange tube is arranged in the preheating section 2, and the high temperature side of the first heat exchange tube of the primary condenser is arranged in the preheating section 3.

5. The waste tire pyrolysis system according to claim 4, characterized in that: The conveying device further includes a heating coil, which is spirally arranged along the conveying direction of the conveying device. There are three heating coils and they are sequentially arranged in the preheating section 1, the preheating section 2, and the preheating section 3; The heating coil of the preheating section one is connected to the high-temperature side of the first heat exchange tube of the secondary condenser, the heating coil of the preheating section two is connected to the high-temperature side of the second heat exchange tube, and the heating coil of the preheating section three is connected to the high-temperature side of the first heat exchange tube of the primary condenser.

6. The waste tire pyrolysis system according to any one of claims 1 to 5, characterized in that: The pyrolysis device is further provided with a flue gas inlet, and the pyrolysis system further comprises a combustion chamber, wherein the flue gas outlet of the combustion chamber is connected to the flue gas inlet so as to allow high-temperature flue gas to enter the pyrolysis device to heat the pyrolysis chamber; The fuel inlet of the combustion chamber is communicated with the pyrolysis gas outlet of the condensing unit so that the pyrolysis gas enters the combustion chamber and is burned to generate high-temperature flue gas.

7. A waste tire pyrolysis method, characterized in that: The pyrolysis method comprises the following steps: Preheating: the waste tire material is transported to the pyrolysis chamber by a conveying device, and the high-temperature side of the first heat exchange tube preheats the transported waste tire material; Pyrolysis: the preheated waste tire material enters the pyrolysis chamber for pyrolysis to obtain gaseous pyrolysis products and pyrolysis carbon black; Condensation separation: the gaseous pyrolysis products are passed into a condensation unit, the low-temperature side of the first heat exchange tube exchanges heat with the gaseous pyrolysis products and the absorbed heat is transferred to the high-temperature side, and the gaseous pyrolysis products are cooled and separated to obtain pyrolysis oil and pyrolysis gas.

8. The waste tire pyrolysis method according to claim 7, characterized in that: After the pyrolysis operation, the pyrolysis method further comprises: The pyrolytic carbon black is cooled by passing the pyrolytic carbon black into a cooler. The low-temperature side of the second heat exchange tube exchanges heat with the pyrolytic carbon black. The heat absorbed by the second heat exchange tube is transferred to the high-temperature side thereof. The high-temperature side of the second heat exchange tube also preheats the transported waste tire material. The pyrolytic carbon black is collected and the cooled pyrolytic carbon black is stored in a pyrolytic carbon black storage tank.

9. The waste tire pyrolysis method according to claim 8, characterized in that: The preheating operation is specifically as follows: the conveying device conveys the waste tire material to the pyrolysis chamber, wherein: The heat exchange medium on the high temperature side of the first heat exchange tube of the secondary condenser flows in the heating coil of the preheating section 1 to preliminarily preheat the waste tire material; The heat exchange medium on the high temperature side of the second heat exchange tube flows in the heating coil of the second preheating section to preheat the preliminarily preheated waste tire material for a second time; The heat exchange medium on the high temperature side of the first heat exchange tube of the primary condenser flows in the heating coil of the preheating section three to preheat the waste tire material that has been preheated twice.

10. The waste tire pyrolysis method according to claim 7, characterized in that: After the condensation separation operation, the pyrolysis method further comprises: Then, the pyrolysis gas is introduced into a combustion chamber for combustion to obtain high-temperature flue gas, which is then used to heat the pyrolysis chamber.

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