System and method for preparing tar by pyrolyzing waste tires

Abstract

The invention discloses a system and a method for preparing tar by pyrolyzing waste tires. The system comprises a shearing device, a feeding device, a pyrolyzing device, a light condensing device, a pyrolytic coke collecting device, a condensing device, a pyrolytic gas circulating device and an oil collecting device, an outlet of the shearing device is communicated with an inlet of the pyrolysis device through the feeding device, a pyrolytic coke outlet of the pyrolysis device is communicated with the pyrolytic coke collecting device, a gas outlet of the pyrolysis device is communicated with an inlet of the condensing device, and a pyrolytic oil outlet of the condensing device is communicated with the oil collecting device; a pyrolysis gas outlet of the condensing device is communicated with an inlet of the pyrolysis device through the pyrolysis gas circulating device, the light condensing device directly faces the pyrolysis device, sunlight irradiates the pyrolysis device through the light condensing device, and the system and the method can be used for preparing tar by coupling solar light condensing, heating and pyrolyzing waste tires for purge gas based on pyrolysis gas.

Description

Technical Field

[0001] The invention belongs to the field of high-value and low-carbon thermal treatment of waste tires, and relates to a system and method for preparing tar by pyrolyzing waste tires. Background Art

[0002] With the development of modern transportation industry, the demand for tires is increasing. However, the utilization rate of tires has also increased greatly, which has led to the generation of a large number of waste tires. Waste tires are mainly composed of rubber, carbon black, additives and other substances, which makes them extremely difficult to be naturally degraded. Random discarding and untimely treatment have brought damage to the natural environment. Pyrolysis is one of the key technologies for high-value treatment of waste tires, and has also been encouraged and supported by the country. The pyrolysis of waste tires consumes a lot of energy. During pyrolysis, an external heat source is required to supply energy. Usually, secondary energy electricity (mainly from coal combustion) or heat energy from the combustion of carbon-containing raw materials is used, which is not conducive to carbon emission reduction; at the same time, a large amount of inert gas is required in the traditional pyrolysis process to purge the pyrolysis volatiles before the pyrolysis oil can be collected. The amount of inert gas used as purge gas is large and the cost is high, which will greatly reduce the economic benefits of waste tire pyrolysis. For industrial-grade waste tire pyrolysis treatment, it is urgent to find a low-cost and less-polluting gas as a purge gas. Solar energy is one of the most important low-carbon renewable energy sources. Concentrating sunlight to pyrolyze waste tires can reduce energy consumption. Pyrolysis gas is part of the pyrolysis products of waste tires. Using it as a purge can reduce the use of inert gas and reduce the pyrolysis cost. Therefore, it is urgent to develop a system and method for preparing tar by pyrolyzing waste tires using pyrolysis gas as a purge gas coupled with solar concentrated heating. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a system and method for pyrolyzing waste tires to prepare tar. The system and method can pyrolyze waste tires to prepare tar based on pyrolysis gas as purge gas coupled with solar concentrated heating.

[0004] To achieve the above-mentioned purpose, the present invention discloses a system for preparing tar by pyrolyzing waste tires, comprising a shearing device, a feeding device, a pyrolysis device, a focusing device, a pyrolysis coke collection device, a condensing device, a pyrolysis gas circulation device and an oil collection device;

[0005] The outlet of the shearing device is connected to the inlet of the pyrolysis device via the feeding device, the pyrolysis coke outlet of the pyrolysis device is connected to the pyrolysis coke collecting device, the gas outlet of the pyrolysis device is connected to the inlet of the condensation device, the pyrolysis oil outlet of the condensation device is connected to the oil collecting device, the pyrolysis gas outlet of the condensation device is connected to the inlet of the pyrolysis device via the pyrolysis gas circulation device, the focusing device is directly opposite to the pyrolysis device, and sunlight is irradiated onto the pyrolysis device through the focusing device.

[0006] Furthermore, the pyrolysis device is a transparent structure.

[0007] Furthermore, one-way valves are provided between the shearing device and the feeding device, between the feeding device and the pyrolysis device, between the pyrolysis device and the pyrolysis coke collection device, between the pyrolysis device and the condensation device, between the condensation device and the oil collection device, between the condensation device and the pyrolysis gas circulation device, and between the pyrolysis gas circulation device and the pyrolysis device.

[0008] The invention discloses a method for preparing tar by pyrolyzing waste tires, comprising the following steps:

[0009] 1) The waste tires are sheared into block-shaped waste tires by a shearing device, and then intermittently fed into the pyrolysis device through a feeding device;

[0010] 2) The focusing device gathers sunlight to provide heat for the pyrolysis device to pyrolyze the waste tires. The pyrolysis coke produced by the pyrolysis device enters the pyrolysis coke collection device. The pyrolysis gas produced by the pyrolysis device enters the condensation device for condensation. The tar obtained by condensation enters the oil collection device. The uncondensed gas obtained enters the pyrolysis device as a purge gas through the pyrolysis gas circulation device to blow out the volatile matter generated during the pyrolysis of the waste tires.

[0011] Furthermore, the length and width of the block-shaped waste tire are both 5-10 cm, and the thickness is 2-4 cm.

[0012] Furthermore, an auger is provided in the pyrolysis device.

[0013] Furthermore, the pyrolysis time of the blocky waste tire in the pyrolysis device is 5-60 minutes.

[0014] Furthermore, the pyrolysis temperature of the blocky waste tires in the pyrolysis device is 450-650°C.

[0015] Furthermore, the yield of pyrolysis coke is 30-60wt%, the yield of pyrolysis gas is 5-30wt%, and the yield of pyrolysis oil is 20-40wt%.

[0016] The present invention has the following beneficial effects:

[0017] The system and method for preparing tar by pyrolyzing waste tires of the present invention, in specific operation, is conducive to reducing energy consumption and environmental pollution in the process of preparing tar by pyrolyzing waste tires through solar concentrated heating and pyrolysis gas circulation as purge gas. The use of solar energy is conducive to carbon emission reduction, and the pyrolysis gas is circulated as purge gas, which reduces the demand for gas in the process of preparing tar by pyrolyzing waste tires, reduces the cost of the entire process, and improves the economic efficiency of preparing tar by pyrolyzing waste tires. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 is a system structure diagram of the present invention;

[0020] Figure 2 The present invention is a flow chart of the method.

[0021] Among them, 1 is a shearing device, 2 is a feeding device, 3 is a pyrolysis device, 4 is a focusing device, 5 is a pyrolysis coke collection device, 6 is a condensing device, 7 is a pyrolysis gas circulation device, and 8 is an oil collection device. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0024] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0025] It should be further understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0026] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0027] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can usually be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0030] Embodiment 1

[0031] refer to Figure 1 The system for preparing tar by pyrolyzing waste tires of the present invention comprises a shearing device 1, a feeding device 2, a pyrolysis device 3, a focusing device 4, a pyrolysis coke collecting device 5, a condensing device 6, a pyrolysis gas circulation device 7 and an oil collecting device 8;

[0032] The outlet of the shearing device 1 is connected to the inlet of the pyrolysis device 3 via the feeding device 2, the pyrolysis coke outlet of the pyrolysis device 3 is connected to the pyrolysis coke collecting device 5, the gas outlet of the pyrolysis device 3 is connected to the inlet of the condensing device 6, the pyrolysis oil outlet of the condensing device 6 is connected to the oil collecting device 8, the pyrolysis gas outlet of the condensing device 6 is connected to the inlet of the pyrolysis device 3 via the pyrolysis gas circulation device 7, the focusing device 4 is directly opposite to the pyrolysis device 3, and the sunlight is irradiated onto the pyrolysis device 3 through the focusing device 4.

[0033] As an embodiment of the present invention, the shearing device 1 contains a device capable of breaking waste tires into blocks.

[0034] As an embodiment of the present invention, the pyrolysis device 3 is a transparent structure.

[0035] As an embodiment of the present invention, the focusing device 4 is an arc-shaped device that can reflect sunlight.

[0036] As an embodiment of the present invention, the temperature in the pyrolysis device 3 is 450-650°C.

[0037] As an embodiment of the present invention, one-way valves are provided between the shearing device 1 and the feeding device 2, between the feeding device 2 and the pyrolysis device 3, between the pyrolysis device 3 and the pyrolysis coke collection device 5, between the pyrolysis device 3 and the condensation device 6, between the condensation device 6 and the oil collection device 8, between the condensation device 6 and the pyrolysis gas circulation device 7, and between the pyrolysis gas circulation device 7 and the pyrolysis device 3 to prevent backflow of materials or products.

[0038] Embodiment 2

[0039] refer to Figure 2 The method for preparing tar by pyrolyzing waste tires of the present invention comprises the following steps:

[0040] 1) The waste tires are sheared into block-shaped waste tires by the shearing device 1, and then intermittently fed into the pyrolysis device 3 by the feeding device 2;

[0041] 2) The focusing device 4 gathers sunlight to provide heat for the pyrolysis device 3 to pyrolyze the waste tires. The pyrolysis coke produced by the pyrolysis device 3 enters the pyrolysis coke collecting device 5. The pyrolysis gas produced by the pyrolysis device 3 enters the condensing device 6 for condensation, wherein the tar obtained by condensation enters the oil collecting device 8. The uncondensed gas obtained enters the pyrolysis device 3 as a purge gas through the pyrolysis gas circulation device 7 to blow out the volatile matter generated during the pyrolysis of the waste tires.

[0042] In step 1), the length and width of the block-shaped waste tires are 5-10 cm and the thickness is 2-4 cm.

[0043] The feeding method of the feeding device 2 is to transport the block-shaped waste tires through a dragon transmission, and a relatively closed method is adopted for transportation, so as to reduce the release of gas into the atmosphere during the transportation of the waste tires;

[0044] The focusing device 4 uses multiple angles to concentrate sunlight to provide heat for pyrolysis of waste tires.

[0045] The pyrolysis device 3 is provided with an auger for mixing the block waste tires so that they are evenly heated and fully pyrolyzed. The pyrolysis time of the block waste tires in the pyrolysis device 3 is 5-60 minutes, and the pyrolysis temperature is 450-650°C.

[0046] The yield of pyrolysis coke is 30-60wt%, the yield of pyrolysis gas is 5-30wt%, and the yield of pyrolysis oil is 20-40wt%.

[0047] Embodiment 3

[0048] The method for preparing tar by pyrolyzing waste tires of the present invention comprises the following steps:

[0049] 1) Waste tires are sheared into block-shaped waste tires by shearing device 1, and then intermittently fed into pyrolysis device 3 by feeding device 2;

[0050] 2) The focusing device 4 gathers sunlight to provide heat for the pyrolysis device 3 to pyrolyze the waste tires. The pyrolysis coke produced by the pyrolysis device 3 enters the pyrolysis coke collecting device 5. The pyrolysis gas produced by the pyrolysis device 3 enters the condensing device 6 for condensation, wherein the tar obtained by condensation enters the oil collecting device 8. The uncondensed gas obtained enters the pyrolysis device 3 as a purge gas through the pyrolysis gas circulation device 7 to blow out the volatile matter generated during the pyrolysis of the waste tires.

[0051] The sample was taken out, the mass was weighed and the product yield was calculated; the calorific value of the pyrolysis oil was analyzed by calorific value. In this embodiment, the pyrolysis coke yield was 38.8wt%, the pyrolysis gas yield was 22.4wt%, and the pyrolysis oil yield was 38.8wt%; the calorific value of the pyrolysis oil was 42.3MJ / kg.

[0052] Embodiment 4

[0053] The method for preparing tar by pyrolyzing waste tires of the present invention comprises the following steps:

[0054] 1) The waste tires are sheared into block-shaped waste tires by the shearing device 1, and then intermittently fed into the pyrolysis device 3 by the feeding device 2;

[0055] 2) The focusing device 4 gathers sunlight to provide heat for the pyrolysis device 3 to pyrolyze the waste tires. The pyrolysis coke produced by the pyrolysis device 3 enters the pyrolysis coke collecting device 5. The pyrolysis gas produced by the pyrolysis device 3 enters the condensing device 6 for condensation, wherein the tar obtained by condensation enters the oil collecting device 8. The uncondensed gas obtained enters the pyrolysis device 3 as a purge gas through the pyrolysis gas circulation device 7 to blow out the volatile matter generated during the pyrolysis of the waste tires.

[0056] In step 1), the length and width of the block-shaped waste tires are 6 cm and the thickness is 2.5 cm.

[0057] The feeding method of the feeding device 2 is to transport the block-shaped waste tires through a dragon transmission, and a relatively closed method is adopted for transportation, so as to reduce the release of gas into the atmosphere during the transportation of the waste tires;

[0058] The focusing device 4 uses multiple angles to concentrate sunlight to provide heat for pyrolysis of waste tires.

[0059] The pyrolysis device 3 is provided with an auger for mixing the block waste tires so that they are evenly heated and fully pyrolyzed. The pyrolysis time of the block waste tires in the pyrolysis device 3 is 60 minutes, and the pyrolysis temperature is 500°C.

[0060] The yield of pyrolysis coke is 30wt%, the yield of pyrolysis gas is 30wt%, and the yield of pyrolysis oil is 40wt%.

[0061] Embodiment 5

[0062] The method for preparing tar by pyrolyzing waste tires of the present invention comprises the following steps:

[0063] 1) The waste tires are sheared into block-shaped waste tires by the shearing device 1, and then intermittently fed into the pyrolysis device 3 by the feeding device 2;

[0064] 2) The focusing device 4 gathers sunlight to provide heat for the pyrolysis device 3 to pyrolyze the waste tires. The pyrolysis coke produced by the pyrolysis device 3 enters the pyrolysis coke collecting device 5. The pyrolysis gas produced by the pyrolysis device 3 enters the condensing device 6 for condensation, wherein the tar obtained by condensation enters the oil collecting device 8. The uncondensed gas obtained enters the pyrolysis device 3 as a purge gas through the pyrolysis gas circulation device 7 to blow out the volatile matter generated during the pyrolysis of the waste tires.

[0065] In step 1), the length and width of the block-shaped waste tires are 8 cm and the thickness is 3 cm.

[0066] The feeding method of the feeding device 2 is to transport the block-shaped waste tires through a dragon transmission, and a relatively closed method is adopted for transportation, so as to reduce the release of gas into the atmosphere during the transportation of the waste tires;

[0067] The focusing device 4 uses multiple angles to concentrate sunlight to provide heat for pyrolysis of waste tires.

[0068] The pyrolysis device 3 is provided with an auger for mixing the block waste tires so that they are evenly heated and fully pyrolyzed. The pyrolysis time of the block waste tires in the pyrolysis device 3 is 30 minutes, and the pyrolysis temperature is 550°C.

[0069] The yield of pyrolysis coke is 40wt%, the yield of pyrolysis gas is 25wt%, and the yield of pyrolysis oil is 35wt%.

[0070] Embodiment 6

[0071] The method for preparing tar by pyrolyzing waste tires of the present invention comprises the following steps:

[0072] 1) The waste tires are sheared into block-shaped waste tires by the shearing device 1, and then intermittently fed into the pyrolysis device 3 by the feeding device 2;

[0073] 2) The focusing device 4 gathers sunlight to provide heat for the pyrolysis device 3 to pyrolyze the waste tires. The pyrolysis coke produced by the pyrolysis device 3 enters the pyrolysis coke collecting device 5. The pyrolysis gas produced by the pyrolysis device 3 enters the condensing device 6 for condensation, wherein the tar obtained by condensation enters the oil collecting device 8. The uncondensed gas obtained enters the pyrolysis device 3 as a purge gas through the pyrolysis gas circulation device 7 to blow out the volatile matter generated during the pyrolysis of the waste tires.

[0074] In step 1), the length and width of the block-shaped waste tire are 10 cm and the thickness is 4 cm.

[0075] The feeding method of the feeding device 2 is to transport the block-shaped waste tires through a dragon transmission, and a relatively closed method is adopted for transportation, so as to reduce the release of gas into the atmosphere during the transportation of the waste tires;

[0076] The focusing device 4 uses multiple angles to concentrate sunlight to provide heat for pyrolysis of waste tires.

[0077] The pyrolysis device 3 is provided with an auger for mixing the block waste tires so that they are evenly heated and fully pyrolyzed. The pyrolysis time of the block waste tires in the pyrolysis device 3 is 60 minutes, and the pyrolysis temperature is 650°C.

[0078] The yield of pyrolysis coke is 60wt%, the yield of pyrolysis gas is 15wt%, and the yield of pyrolysis oil is 25wt%.

[0079] Embodiment 7

[0080] The method for preparing tar by pyrolyzing waste tires of the present invention comprises the following steps:

[0081] 1) The waste tires are sheared into block-shaped waste tires by the shearing device 1, and then intermittently fed into the pyrolysis device 3 by the feeding device 2;

[0082] 2) The focusing device 4 gathers sunlight to provide heat for the pyrolysis device 3 to pyrolyze the waste tires. The pyrolysis coke produced by the pyrolysis device 3 enters the pyrolysis coke collecting device 5. The pyrolysis gas produced by the pyrolysis device 3 enters the condensing device 6 for condensation, wherein the tar obtained by condensation enters the oil collecting device 8. The uncondensed gas obtained enters the pyrolysis device 3 as a purge gas through the pyrolysis gas circulation device 7 to blow out the volatile matter generated during the pyrolysis of the waste tires.

[0083] In step 1), the length and width of the block-shaped waste tires are 5 cm and the thickness is 2 cm.

[0084] The feeding method of the feeding device 2 is to transport the block-shaped waste tires through a dragon transmission, and a relatively closed method is adopted for transportation, so as to reduce the release of gas into the atmosphere during the transportation of the waste tires;

[0085] The focusing device 4 uses multiple angles to concentrate sunlight to provide heat for pyrolysis of waste tires.

[0086] The pyrolysis device 3 is provided with an auger for mixing the block waste tires so that they are evenly heated and fully pyrolyzed. The pyrolysis time of the block waste tires in the pyrolysis device 3 is 5 minutes, and the pyrolysis temperature is 450°C.

[0087] The yield of pyrolysis coke is 60wt%, the yield of pyrolysis gas is 5wt%, and the yield of pyrolysis oil is 35wt%.

[0088] It should be noted that in view of the current problems of huge output of waste tires, difficulty in natural degradation and urgent need for high-value treatment, the present invention utilizes concentrated heating coupled with pyrolysis gas circulation as purge gas to reduce energy consumption in the pyrolysis process of waste tires, and reduces the pyrolysis cost of waste tires, thereby achieving high-value recycling of waste tires and reducing the environmental hazards of waste tires.

[0089] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0090] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0091] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A system for preparing tar by pyrolyzing waste tires, characterized in that: It comprises a shearing device (1), a feeding device (2), a pyrolysis device (3), a focusing device (4), a pyrolysis coke collection device (5), a condensing device (6), a pyrolysis gas circulation device (7) and an oil collection device (8); The outlet of the shearing device (1) is connected to the inlet of the pyrolysis device (3) via the feeding device (2); the pyrolysis coke outlet of the pyrolysis device (3) is connected to the pyrolysis coke collecting device (5); the gas outlet of the pyrolysis device (3) is connected to the inlet of the condensing device (6); the pyrolysis oil outlet of the condensing device (6) is connected to the oil collecting device (8); the pyrolysis gas outlet of the condensing device (6) is connected to the inlet of the pyrolysis device (3) via the pyrolysis gas circulation device (7); the focusing device (4) is directly opposite to the pyrolysis device (3), and sunlight is irradiated onto the pyrolysis device (3) via the focusing device (4).

2. The system for preparing tar by pyrolyzing waste tires according to claim 1, characterized in that: The pyrolysis device (3) is a transparent structure.

3. The system for preparing tar by pyrolyzing waste tires according to claim 1, characterized in that: One-way valves are provided between the shearing device (1) and the feeding device (2), between the feeding device (2) and the pyrolysis device (3), between the pyrolysis device (3) and the pyrolysis coke collecting device (5), between the pyrolysis device (3) and the condensing device (6), between the condensing device (6) and the oil collecting device (8), between the condensing device (6) and the pyrolysis gas circulation device (7), and between the pyrolysis gas circulation device (7) and the pyrolysis device (3).

4. A method for preparing tar by pyrolyzing waste tires, characterized in that: The system for preparing tar by pyrolyzing waste tires according to claim 1 comprises the following steps: 1) Waste tires are sheared into block-shaped waste tires by a shearing device (1), and then intermittently fed into a pyrolysis device (3) through a feeding device (2); 2) A light concentrating device (4) concentrates sunlight to provide heat for a pyrolysis device (3) to pyrolyze waste tires. The pyrolysis coke produced by the pyrolysis device (3) enters a pyrolysis coke collecting device (5). The pyrolysis gas produced by the pyrolysis device (3) enters a condensing device (6) for condensation. The tar obtained by condensation enters an oil collecting device (8). The uncondensed gas is passed through a pyrolysis gas circulation device (7) as a purge gas and enters the pyrolysis device (3) to blow out volatiles generated during the pyrolysis of waste tires.

5. The method for preparing tar by pyrolyzing waste tires according to claim 4, characterized in that: The length and width of the block waste tire are 5-10cm and the thickness is 2-4cm.

6. The method for preparing tar by pyrolyzing waste tires according to claim 4, characterized in that: An auger is arranged inside the pyrolysis device (3).

7. The method for preparing tar by pyrolyzing waste tires according to claim 4, characterized in that: The pyrolysis time of the blocky waste tires in the pyrolysis device (3) is 5-60 minutes.

8. The method for preparing tar by pyrolyzing waste tires according to claim 4, characterized in that: The pyrolysis temperature of the blocky waste tires in the pyrolysis device (3) is 450-650°C.

9. The method for preparing tar by pyrolyzing waste tires according to claim 4, characterized in that: The yield of pyrolysis coke is 30-60wt%, and the yield of pyrolysis gas is 5-30wt%.

10. The method for preparing tar by pyrolyzing waste tires according to claim 4, characterized in that: The yield of pyrolysis oil is 20-40wt%.

Images