System and method for treating tires

Abstract

The invention discloses a system and method for processing tires. The system comprises: a wire drawing machine, a pulverizer, a magnetic separator, a molten salt heating furnace, a rubber particle conveying pipe, a cyclone separator and a pyrolysis reactor. The pyrolysis reactor comprises: a reactor body and a stirring assembly. The reactor body is provided with an inlet for separated rubber particles, an outlet for pyrolysis gas and an outlet for pyrolysis carbon; the stirring assembly comprises a stirring shaft and a propeller. The stirring shaft runs through the interior of the reactor body from top to bottom. The stirring shaft is a hollow structure. A high-temperature molten salt inlet is provided on the stirring shaft extending from the top of the reactor body. The high-temperature molten salt inlet is connected to the heating molten salt outlet. A low-temperature molten salt outlet is provided on the stirring shaft extending from the bottom of the reactor body; the propeller is arranged in the reactor body, one end of the propeller is arranged on the stirring shaft, and the other end of the propeller extends from the stirring shaft toward the inner wall of the reactor body. The propeller is a hollow structure, and the stirring shaft is connected to the interior of the propeller.

Description

Technical Field

[0001] The invention belongs to the field of pyrolysis, and in particular relates to a system and method for processing tires. Background Art

[0002] my country is a major producer of waste tires. Especially with the rapid development of the automobile industry, the output of waste tires in my country has increased year by year. According to statistics, in 2009, my country produced 233 million waste tires annually, weighing about 8.6 million tons. Compared with the waste tire treatment methods such as retreading, new rubber powder, recycling, and incineration, the pyrolysis method has the disadvantages of large waste tire treatment volume, high efficiency, and low environmental pollution, which is more in line with the principles of resource utilization, harmlessness, and reduction of waste treatment. However, the current pyrolysis tire device has the defects of low thermal efficiency, high equipment maintenance cost, and complex process flow, resulting in low tire treatment efficiency and high treatment cost.

[0003] Therefore, the existing technology for processing tires needs to be improved. 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. To this end, one object of the present invention is to provide a system and method for treating tires, which can significantly improve the efficiency of tire pyrolysis and significantly reduce energy consumption and processing costs.

[0005] In one aspect of the present invention, the present invention provides a system for processing a tire. According to an embodiment of the present invention, the system comprises:

[0006] A wire drawing machine, wherein the wire drawing machine has a tire inlet, a wire outlet and a tire outlet after wire drawing;

[0007] A pulverizer, the pulverizer having a wire-drawn tire inlet and a tire particle outlet, the wire-drawn tire inlet being connected to the wire-drawn tire outlet;

[0008] A magnetic separator, the magnetic separator having a tire particle inlet, a small-particle steel wire outlet and a rubber particle outlet, the tire particle inlet being connected to the tire particle outlet;

[0009] A molten salt heating furnace, wherein the molten salt heating furnace has a burner, a molten salt inlet, a heated molten salt outlet and a flue gas outlet;

[0010] A rubber particle conveying pipe, one end of which is connected to the smoke outlet and the rubber particle outlet;

[0011] A cyclone separator, the cyclone separator having a rubber particle inlet, a separated smoke outlet and a separated rubber particle outlet, the rubber particle inlet being connected to the other end of the conveying pipe;

[0012] A pyrolysis reactor, comprising:

[0013] A reactor body, wherein the reactor body is provided with a separated rubber particle inlet, a pyrolysis gas outlet and a pyrolysis carbon outlet, the separated rubber particle inlet is connected to the separated rubber particle outlet, and the pyrolysis gas outlet is connected to the burner;

[0014] A stirring assembly, the stirring assembly comprising:

[0015] A stirring shaft, the stirring shaft passes through the interior of the reactor body from top to bottom, and the stirring shaft is a hollow structure, a high-temperature molten salt inlet is provided on the stirring shaft extending from the top end of the reactor body, and the high-temperature molten salt inlet is connected to the heating molten salt outlet, and a low-temperature molten salt outlet is provided on the stirring shaft extending from the bottom end of the reactor body, and the low-temperature molten salt outlet is connected to the molten salt inlet;

[0016] A propeller is arranged in the reactor body, one end of the propeller is arranged on the stirring shaft, and the other end of the propeller extends from the stirring shaft toward the inner wall of the reactor body. The propeller is a hollow structure, and the stirring shaft is connected to the inside of the propeller.

[0017] According to the system for processing tires of the embodiment of the present invention, the steel wire in the tires can be effectively recovered by spinning, crushing and magnetically separating the tires, and then the rubber particles obtained after magnetic separation are transported to the cyclone separator by flue gas and then supplied to the pyrolysis reactor, wherein a hollow stirring shaft and propeller are arranged in the pyrolysis reactor, and heating molten salt is supplied in the stirring shaft and propeller, and the molten salt is indirectly exchanged with the rubber particles in the reactor to pyrolyze the rubber particles, on the one hand, the specific heat of the molten salt liquid is much greater than that of other heat carriers, and it can significantly improve the heat transfer efficiency as a heat carrier, thereby improving the pyrolysis efficiency of rubber, on the other hand, by setting the stirring shaft and propeller of the stirring assembly as a hollow structure, the propeller of the stirring device can be used as the reaction space of the heat carrier, which significantly saves the reactor volume, and at the same time, the stirring assembly not only plays the dual role of stirring and heat conduction, but also has the function of promoting the flow of solid particles or pastes due to the rotation of the heat exchange surface. Therefore, the use of this system can significantly improve the efficiency of tire pyrolysis, and greatly reduce energy consumption and processing costs.

[0018] In addition, the tire processing system according to the above embodiment of the present invention may also have the following additional technical features:

[0019] In some embodiments of the present invention, the system further comprises: a pyrolytic carbon conveying pipe, one end of which is connected to the pyrolytic carbon outlet, and the separated flue gas outlet is connected to the pyrolytic carbon conveying pipe.

[0020] In some embodiments of the present invention, the separated rubber particle inlet is connected to the separated rubber particle outlet via an inclined conveying pipe, and the inclined angle of the inclined conveying pipe is 45 to 80 degrees.

[0021] In some embodiments of the present invention, the system further comprises: multiple layers of propellers, the multiple layers of propellers are spaced apart in the longitudinal direction of the stirring shaft, each layer of propellers comprises at least two pairs of propellers, and the at least two pairs of propellers are spaced apart and arranged circumferentially along the stirring shaft. Thus, the efficiency of rubber pyrolysis can be significantly improved.

[0022] In some embodiments of the present invention, the distance between two adjacent layers of propellers is 50-500 mm.

[0023] In some embodiments of the present invention, a spring is provided on one end of the propeller close to the inner wall of the reactor body.

[0024] In some embodiments of the present invention, the length of the spring is R / 10 to R / 5, wherein R is the radius of the reactor body.

[0025] In some embodiments of the present invention, the telescopic displacement of the spring is no greater than 1 / 3 of the length of the spring.

[0026] In yet another aspect of the present invention, the present invention provides a method for treating a tire. According to an embodiment of the present invention, the method comprises:

[0027] (1) supplying the tire to the wire drawing process for wire drawing to obtain the wire-drawn tire and the steel wire;

[0028] (2) supplying the tire after spinning to a pulverizer for pulverization to obtain tire particles;

[0029] (3) supplying the tire particles to a magnetic separator for magnetic separation to obtain small-size steel wires and rubber particles;

[0030] (4) supplying the fuel gas to the molten salt heating furnace through a burner to burn and heat the molten salt, so as to obtain flue gas and heated molten salt;

[0031] (5) supplying the flue gas to a rubber particle conveying pipe to convey the rubber particles;

[0032] (6) supplying the mixture containing flue gas and rubber particles in the rubber particle conveying pipe to a cyclone separator for gas-solid separation, so as to obtain separated flue gas and separated rubber particles;

[0033] (7) The separated rubber particles are supplied to a pyrolysis reactor to undergo pyrolysis reaction using the heated molten salt to obtain pyrolysis char, pyrolysis gas, and low-temperature molten salt, and the low-temperature molten salt and pyrolysis gas are supplied to the molten salt heating furnace.

[0034] According to the method for processing tires of the embodiment of the present invention, the steel wire in the tire can be effectively recovered by spinning, crushing and magnetically separating the tire, and then the rubber particles obtained after magnetic separation are transported to the cyclone separator by flue gas and then supplied to the pyrolysis reactor, wherein a hollow stirring shaft and propeller are arranged in the pyrolysis reactor, and heating molten salt is supplied in the stirring shaft and propeller, and the molten salt is indirectly exchanged with the rubber particles in the reactor to pyrolyze the rubber particles, on the one hand, the specific heat of the molten salt liquid is much greater than that of other heat carriers, and it can significantly improve the heat transfer efficiency as a heat carrier, thereby improving the pyrolysis efficiency of rubber, on the other hand, by setting the stirring shaft and propeller of the stirring assembly as a hollow structure, the propeller of the stirring device can be used as the reaction space of the heat carrier, which significantly saves the reactor volume, and at the same time, the stirring assembly not only plays the dual role of stirring and heat conduction, but also has the function of promoting the flow of solid particles or pastes due to the rotation of the heat exchange surface. Therefore, the method can significantly improve the efficiency of tire pyrolysis, and greatly reduce energy consumption and processing costs.

[0035] In some embodiments of the present invention, in step (5), the conveying speed of the rubber particles is 10 to 25 m / s.

[0036] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0038] Figure 1 is a schematic diagram of the structure of a system for processing tires according to one embodiment of the present invention;

[0039] Figure 2 is a schematic structural diagram of a pyrolysis reactor in a tire processing system according to an embodiment of the present invention;

[0040] Figure 3 yes Figure 2 AA structure diagram of the pyrolysis reactor;

[0041] Figure 4 1 is a schematic flow chart of a method for processing a tire according to an embodiment of the present invention. DETAILED DESCRIPTION

[0042] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0043] 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 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, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0044] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0046] In one aspect of the present invention, a system for processing a tire is provided. Figure 1 and 2 The system includes: a wire drawing machine 100, a pulverizer 200, a magnetic separator 300, a molten salt heating furnace 400, a rubber particle conveying pipe 500, a cyclone separator 600 and a pyrolysis reactor 700.

[0047] According to an embodiment of the present invention, the wire drawing machine 100 has a tire inlet 101, a wire outlet 102 and a tire outlet 103 after wire drawing, and is suitable for drawing out the wire from the tire. Thus, the wire from the waste tire can be effectively recycled, and the influence of the wire on the subsequent pyrolysis reaction of rubber particles can be avoided.

[0048] According to an embodiment of the present invention, the pulverizer 200 has a tire inlet 201 after drawing and a tire particle outlet 202, and the tire inlet 201 after drawing is connected to the tire outlet 103 after drawing, and is suitable for pulverizing the tire after the steel wire is removed, so as to obtain tire particles. Further, the particle size of the tire particles can be no more than 3mm. Thus, the rubber particles can be evenly dispersed in the reaction space of the subsequent pyrolysis reactor, so that the pyrolysis efficiency of the rubber particles can be significantly improved.

[0049] According to an embodiment of the present invention, the magnetic separator 300 has a tire particle inlet 301, a small-particle steel wire outlet 302 and a rubber particle outlet 303. The tire particle inlet 301 is connected to the tire particle outlet 202 and is suitable for magnetically separating the tire particles obtained after crushing, thereby separating the iron wire that has not been extracted, thereby avoiding the influence on the pyrolysis reaction in the subsequent process.

[0050] According to an embodiment of the present invention, the molten salt heating furnace 400 has a burner 401, a molten salt inlet 402, a heated molten salt outlet 403 and a flue gas outlet 404, and is suitable for supplying gas to the burner for combustion to indirectly heat the molten salt in the molten salt heating furnace, thereby obtaining heated molten salt (400-600°C) and flue gas (500-700°C). Specifically, the molten salt can be other low-melting-point inorganic salts such as nitrates, chlorides, fluorides, carbonates and sulfates, or a mixture of two or more inorganic salts in different proportions, and the molten salt is heated to a temperature above the melting point (400-600°C) through a molten salt furnace. It should be noted that if the molten salt is a mixed salt of multiple inorganic salts, those skilled in the art can select the mixing ratio according to actual needs.

[0051] According to the embodiment of the present invention, one end of the rubber particle conveying pipe 500 is connected to the flue gas outlet 404 and the rubber particle outlet 303, and is suitable for conveying the rubber particles obtained in the magnetic separation process by using the high-temperature flue gas generated in the molten salt heating furnace. Specifically, the rubber particles are conveyed to the cyclone separator through the rubber conveying pipe, and a flow regulating valve is provided on the rubber conveying pipe, and the conveying speed is adjusted by the flow regulating valve so that the conveying speed is controlled at 10 to 25 m / s, and too fast a speed will accelerate the wear of the conveying pipe.

[0052] According to an embodiment of the present invention, the cyclone separator 600 has a rubber particle inlet 601, a separated flue gas outlet 602 and a separated rubber particle outlet 603. The rubber particle inlet 601 is connected to the other end of the rubber particle conveying pipe 500 and is suitable for performing gas-solid separation on the mixture containing rubber particles and flue gas obtained in the above-mentioned rubber conveying pipe to obtain separated flue gas and separated rubber particles.

[0053] According to an embodiment of the present invention, referring to Figure 1-2 The pyrolysis reactor 700 includes a reactor body 71 and a stirring assembly 72 .

[0054] According to a specific embodiment of the present invention, the reactor body 71 is provided with an inlet 701 for separated rubber particles, a pyrolysis gas outlet 702 and a pyrolysis carbon outlet 703. The inlet 701 for separated rubber particles is connected to the outlet 603 for separated rubber particles, and the pyrolysis gas outlet 702 is connected to the burner 401. During the process, the rubber particles are heated to 300°C to 500°C for drying and carbonization pyrolysis reaction. The reaction time is 5min to 40min, and the generated 350 to 450°C pyrolysis gas is sent to the molten salt heating furnace to heat the molten salt. Since all the pyrolysis gas is recycled as fuel gas, no additional natural gas or other energy sources are required per ton of tires, energy consumption is saved by more than 20%, and the residence time is more than 30min shorter than that of other tire pyrolysis processes. Specifically, refer to Figure 2 The reactor body 71 is arranged in a vertical structure, and a pyrolysis space 70 is formed therein. The separated rubber particle inlet 701 is arranged on the top side wall of the reactor body 71, the pyrolysis gas outlet 702 is arranged at the top of the reactor body 71, and the pyrolysis carbon outlet 703 is arranged at the bottom of the reactor body 71.

[0055] According to another specific embodiment of the present invention, Figure 2The stirring assembly 72 includes a stirring shaft 721 and a propeller 722, wherein the stirring shaft 721 penetrates the interior of the reactor body 71 from top to bottom, and the stirring shaft 721 is a hollow structure, a high-temperature molten salt inlet 704 is provided on the stirring shaft 721 extending from the top of the reactor body 71, and a low-temperature molten salt outlet 705 is provided on the stirring shaft 721 extending from the bottom of the reactor body 71. The stirring shaft 721 rotates under the drive of the stirring motor 724, and the propeller 722 is arranged in the reactor body 71, one end of the propeller 722 is arranged on the stirring shaft 721, and the other end of the propeller 722 extends from the stirring shaft 721 toward the inner wall of the reactor body 71, the propeller 721 is a hollow structure, and the stirring shaft 721 is connected to the inside of the propeller 722. Specifically, the heated molten salt obtained in the molten salt heating furnace 400 is supplied to the stirring shaft 721 of the hollow structure through the high-temperature molten salt inlet 704 on the stirring shaft 721 and enters the propeller 722 of the hollow structure from top to bottom. As the stirring assembly 72 rotates, the propeller 722 contacts and exchanges heat with the rubber particles entering the rubber particle inlet 701 after separation, and pyrolysis treatment occurs. The obtained pyrolysis gas is discharged through the pyrolysis gas outlet 702 provided on the reactor body 71, and the obtained pyrolysis char is discharged from the pyrolysis char outlet 703 provided at the bottom of the reactor body 71.

[0056] According to a specific example of the present invention, the stirring shaft 721 passes through the pyrolysis space 70 from the center of the top of the reactor body 71 and extends out of the reactor body 71, the high-temperature molten salt inlet 201 is arranged above the top of the reactor body 71, and the low-temperature molten salt outlet 702 is arranged at the bottom of the stirring shaft 721, and the low-temperature molten salt outlet 702 is connected to the molten salt inlet 402, that is, the low-temperature molten salt after heat exchange is supplied to the molten salt heating furnace for further heating and reuse. Preferably, the high-temperature molten salt inlet 701 is connected to the stirring shaft 721 through a coupling (not shown), and the low-temperature molten salt outlet 702 is connected to the stirring shaft 721 through a coupling (not shown).

[0057] According to another specific example of the present invention, Figure 2 The above-mentioned reactor includes a multi-layer propeller 722, and the multi-layer propeller 722 is distributed at intervals along the longitudinal direction of the stirring shaft 721, so as to not only effectively increase the heat exchange area between the rubber particles and the molten salt, but also continuously stir the rubber particles to improve the pyrolysis efficiency of the rubber particles. Preferably, the distance between two adjacent layers of propellers 722 is 50 to 500 mm. The inventors found that if the distance between two adjacent layers of propellers is too large, there will be fewer propeller blades, the heat transfer area will be reduced, and the economy of the equipment will be reduced. At the same time, the propeller blades not only play a role in heat transfer, but also play a role in breaking up the rubber particles. Therefore, by adopting this arrangement, the rubber particles can be evenly dispersed in the reactor body while increasing the heat exchange area, thereby improving the pyrolysis efficiency of the rubber particles.

[0058] According to another specific example of the present invention, referring to Figure 2 and 3 , a spring 723 is provided on one end of the propeller 722 near the inner wall of the reactor body 71. Specifically, one end of the spring 723 is welded to the end of the propeller 722 near the reactor body 71. When the reactor body is subjected to thermal stress due to high temperature and causes thermal stress displacement, the spring can deform the propeller of the stirring assembly and the reactor body to couple and match, thereby solving the problem that the propeller and the inner wall of the reactor body are hard-scratched due to deformation of the reactor body. Preferably, the fixed length L1 of the spring 723 is R / 10 to R / 5 (R is the radius of the reactor body), and the retractable displacement of the spring 723 is determined according to the thermal deformation of the equipment, and the optimal retractable displacement is L2 not higher than L1 / 3 (L1 is the fixed length of the spring). It should be noted that the "fixed length of the spring" can be understood as the length of the spring without external force, and the "retractable displacement of the spring" can be understood as the compression distance of the spring under the action of external force, that is, the length difference between the length of the spring under the action of external force and the fixed length.

[0059] According to the system for processing tires of the embodiment of the present invention, the steel wire in the tires can be effectively recovered by spinning, crushing and magnetically separating the tires, and then the rubber particles obtained after magnetic separation are transported to the cyclone separator by flue gas and then supplied to the pyrolysis reactor, wherein a hollow stirring shaft and propeller are arranged in the pyrolysis reactor, and heating molten salt is supplied in the stirring shaft and propeller, and the molten salt is indirectly exchanged with the rubber particles in the reactor to pyrolyze the rubber particles, on the one hand, the specific heat of the molten salt liquid is much greater than that of other heat carriers, and it can significantly improve the heat transfer efficiency as a heat carrier, thereby improving the pyrolysis efficiency of rubber, on the other hand, by setting the stirring shaft and propeller of the stirring assembly as a hollow structure, the propeller of the stirring device can be used as the reaction space of the heat carrier, which significantly saves the reactor volume, and at the same time, the stirring assembly not only plays the dual role of stirring and heat conduction, but also has the function of promoting the flow of solid particles or pastes due to the rotation of the heat exchange surface. Therefore, the use of this system can significantly improve the efficiency of tire pyrolysis, and greatly reduce energy consumption and processing costs.

[0060] For further reference, Figure 1 The system further comprises a pyrolytic carbon conveying pipe 800, one end of which is connected to the pyrolytic carbon outlet 703, and the flue gas outlet 602 after separation is connected to the pyrolytic carbon conveying pipe 800, and is suitable for pneumatically conveying the pyrolytic carbon obtained in the pyrolysis reactor to the downstream for use by using the flue gas generated during the cyclone separation process after being pressurized by a fan.

[0061] For further reference, Figure 1The separated rubber particle inlet 701 is connected to the separated rubber particle outlet 603 through an inclined conveying pipe 900. The separated rubber particles flow directly into the pyrolysis reactor body through the inclined conveying pipe. The angle α of the inclined conveying pipe is 45 to 80 degrees. If the angle is too small, materials may accumulate.

[0062] In yet another aspect of the present invention, the present invention provides a method for treating a tire. Figure 4 , the method comprising:

[0063] S100: The tire is fed into the wire drawing machine for wire drawing

[0064] In this step, the tire is supplied to the wire drawing process for wire drawing to obtain the wire drawing tire and steel wire. Thus, the steel wire in the waste tire can be effectively recovered and the influence of the steel wire on the subsequent pyrolysis reaction of rubber particles can be avoided.

[0065] S200: The tire after spinning is supplied to the pulverizer for pulverization

[0066] In this step, the tire after spinning obtained above is supplied to a pulverizer for pulverization to obtain tire particles. Further, the particle size of the tire particles can be no greater than 3 mm. Thus, the rubber particles can be evenly dispersed in the reaction space of the subsequent pyrolysis reactor, thereby significantly improving the pyrolysis efficiency of the rubber particles.

[0067] S300: Feed tire particles to the magnetic separator for magnetic separation

[0068] In this step, the tire particles obtained above are supplied to a magnetic separator for magnetic separation to obtain small-size steel wires and rubber particles, thereby avoiding the influence on the pyrolysis reaction in the subsequent process.

[0069] S400: The gas is supplied to the molten salt heating furnace through the burner to heat the molten salt

[0070] In this step, the gas is supplied to the molten salt heating furnace through the burner to burn and heat the molten salt to obtain heated molten salt (400-600°C) and flue gas (500-700°C). Specifically, the molten salt can be other low-melting-point inorganic salts such as nitrates, chlorides, fluorides, carbonates and sulfates, or a mixture of two or more inorganic salts in different proportions. The molten salt is heated to a temperature above the melting point (400-600°C) through a molten salt furnace. It should be noted that if the molten salt is a mixed salt of multiple inorganic salts, those skilled in the art can select the mixing ratio according to actual needs.

[0071] S500: Supplied the flue gas to the rubber particle conveying pipe to convey the rubber particles

[0072] In this step, the high-temperature flue gas generated in the molten salt heating furnace is used to transport the rubber particles obtained in the magnetic separation process. Specifically, the rubber particles are transported to the cyclone separator through a rubber transport pipe, and a flow regulating valve is provided on the rubber transport pipe to adjust the transport speed through the flow regulating valve so that the transport speed is controlled at 10 to 25 m / s. Too fast a speed will accelerate the wear of the transport pipe.

[0073] S600: The mixture containing flue gas and rubber particles in the rubber particle conveying pipe is supplied to the cyclone separator for gas-solid separation

[0074] In this step, the mixture containing flue gas and rubber particles in the rubber particle conveying pipe is supplied to a cyclone separator for gas-solid separation to obtain separated flue gas and separated rubber particles, and the flue gas generated during the cyclone separation process is pressurized by a fan to pneumatically convey the pyrolytic carbon obtained in the pyrolysis reactor to the downstream for use.

[0075] S700: The separated rubber particles are supplied to the pyrolysis reactor to perform pyrolysis reaction by heating molten salt, and the low-temperature molten salt and pyrolysis gas are supplied to the molten salt heating furnace.

[0076] In this step, the rubber particles obtained after the above separation are supplied to the pyrolysis reactor to carry out pyrolysis reaction using the heated molten salt to obtain pyrolysis char, pyrolysis gas and low-temperature molten salt, and the low-temperature molten salt and pyrolysis gas are supplied to the molten salt heating furnace. In this process, the rubber particles are heated to 300°C to 500°C for drying and carbonization pyrolysis reaction, and the reaction time is 5min to 40min. The generated 350-450°C pyrolysis gas is sent to the molten salt heating furnace to heat the molten salt, and the low-temperature molten salt after heat exchange is supplied to the molten salt heating furnace for further heating and reuse. Since all the pyrolysis gas is reused as fuel gas, no additional natural gas and other energy sources are required per ton of tires, energy consumption is saved by more than 20%, and the residence time is more than 30min shorter than other tire pyrolysis processes.

[0077] According to the method for processing tires of the embodiment of the present invention, the steel wire in the tire can be effectively recovered by spinning, crushing and magnetically separating the tire, and then the rubber particles obtained after magnetic separation are transported to the cyclone separator by flue gas and then supplied to the pyrolysis reactor, wherein a hollow stirring shaft and propeller are arranged in the pyrolysis reactor, and heating molten salt is supplied in the stirring shaft and propeller, and the molten salt is indirectly exchanged with the rubber particles in the reactor to pyrolyze the rubber particles, on the one hand, the specific heat of the molten salt liquid is much greater than that of other heat carriers, and it can significantly improve the heat transfer efficiency as a heat carrier, thereby improving the pyrolysis efficiency of rubber, on the other hand, by setting the stirring shaft and propeller of the stirring assembly as a hollow structure, the propeller of the stirring device can be used as the reaction space of the heat carrier, which significantly saves the reactor volume, and at the same time, the stirring assembly not only plays the dual role of stirring and heat conduction, but also has the function of promoting the flow of solid particles or pastes due to the rotation of the heat exchange surface. Therefore, the method can significantly improve the efficiency of tire pyrolysis, and greatly reduce energy consumption and processing costs.

[0078] It should be noted that the features and advantages described above for the system for processing tires are also applicable to the method for processing tires, and will not be described in detail here.

[0079] The present invention is described below with reference to specific embodiments. It should be noted that these embodiments are merely illustrative and do not limit the present invention in any way.

[0080] Example

[0081] The system of the present application is used to process waste tires, wherein the particle size of tire particles is not higher than 3 mm, the molten salt is sodium chloride, and the conveying speed of the rubber particle conveying pipe is controlled at 10-25 m / s. The analysis data, process operation parameters and material balance of the waste tires are shown in Tables 1 to 3. From Table 3, the pyrolysis gas yield after tire pyrolysis is greater than 60% (including tar), the carbon black yield is 37%, and the pyrolysis effect is good.

[0082] Table 1: Waste tire analysis data

[0083]

[0084] Table 2: Process operating parameters

[0085]

[0086] Table 3: Material balance

[0087]

[0088] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means 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 representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0089] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A system for processing tires, characterized in that: include: A wire drawing machine, wherein the wire drawing machine has a tire inlet, a wire outlet and a tire outlet after wire drawing; A pulverizer, the pulverizer having a wire-drawn tire inlet and a tire particle outlet, the wire-drawn tire inlet being connected to the wire-drawn tire outlet; A magnetic separator, the magnetic separator having a tire particle inlet, a small-particle steel wire outlet and a rubber particle outlet, the tire particle inlet being connected to the tire particle outlet; A molten salt heating furnace, wherein the molten salt heating furnace has a burner, a molten salt inlet, a heated molten salt outlet and a flue gas outlet; A rubber particle conveying pipe, one end of which is connected to the smoke outlet and the rubber particle outlet; A cyclone separator, the cyclone separator having a rubber particle inlet, a separated smoke outlet and a separated rubber particle outlet, the rubber particle inlet being connected to the other end of the rubber particle conveying pipe; A pyrolysis reactor, comprising: A reactor body, wherein the reactor body is provided with a separated rubber particle inlet, a pyrolysis gas outlet and a pyrolysis carbon outlet, the separated rubber particle inlet is connected to the separated rubber particle outlet, and the pyrolysis gas outlet is connected to the burner; A stirring assembly, the stirring assembly comprising: A stirring shaft, the stirring shaft passes through the interior of the reactor body from top to bottom, and the stirring shaft is a hollow structure, a high-temperature molten salt inlet is provided on the stirring shaft extending from the top end of the reactor body, and the high-temperature molten salt inlet is connected to the heating molten salt outlet, and a low-temperature molten salt outlet is provided on the stirring shaft extending from the bottom end of the reactor body, and the low-temperature molten salt outlet is connected to the molten salt inlet; A propeller, wherein the propeller is disposed in the reactor body, one end of the propeller is disposed on the stirring shaft, and the other end of the propeller extends from the stirring shaft toward the inner wall of the reactor body, the propeller is a hollow structure, and the stirring shaft is connected to the inside of the propeller; Further comprising: multiple layers of the propellers, the multiple layers of propellers being distributed at intervals along the longitudinal direction of the stirring shaft; The distance between the propellers of two adjacent layers is 50~500mm; Further comprising: a pyrolytic carbon delivery pipe, one end of which is connected to the pyrolytic carbon outlet, and the separated flue gas outlet is connected to the pyrolytic carbon delivery pipe; The separated rubber particle inlet is connected to the separated rubber particle outlet through an inclined conveying pipe, and the inclined angle of the inclined conveying pipe is 45 to 80 degrees.

2. The system according to claim 1, characterized in that A spring is arranged on one end of the propeller close to the inner wall of the reactor body.

3. The system according to claim 2, characterized in that The length of the spring is R / 10-R / 5, wherein R is the radius of the reactor body.

4. The system according to claim 3, characterized in that The telescopic displacement of the spring is no greater than 1 / 3 of the length of the spring.

5. A method for treating tires using the system according to any one of claims 1 to 4, characterized in that: include: (1) supplying the tire to the wire drawing process for wire drawing to obtain the wire drawing tire and steel wire; (2) supplying the tire after spinning to a pulverizer for pulverization to obtain tire particles; (3) supplying the tire particles to a magnetic separator for magnetic separation to obtain small-size steel wire and rubber particles; (4) supplying the fuel gas to the molten salt heating furnace through a burner to burn and heat the molten salt, so as to obtain flue gas and heated molten salt; (5) supplying the smoke to a rubber particle conveying pipe to convey the rubber particles; (6) supplying the mixture containing flue gas and rubber particles in the rubber particle conveying pipe to a cyclone separator for gas-solid separation, so as to obtain separated flue gas and separated rubber particles; (7) The separated rubber particles are supplied to a pyrolysis reactor to undergo pyrolysis reaction using the heated molten salt to obtain pyrolysis char, pyrolysis gas, and low-temperature molten salt, and the low-temperature molten salt and pyrolysis gas are supplied to the molten salt heating furnace.

6. The method according to claim 5, characterized in that In step (5), the conveying speed of the rubber particles is 10-25 m / s.

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