A waste tire thermal cracking device

Abstract

The application relates to the technical field of waste tire recycling, in particular to a waste tire thermal cracking device, which comprises a thermal cracking reaction kettle, the thermal cracking reaction kettle is a horizontal rotary kettle body, a plurality of guide plates are arranged on the inner wall of the kettle body of the thermal cracking reaction kettle along the axial direction, the plurality of guide plates are sequentially divided into a feeding section, a reaction section and a discharging section along the feeding direction of materials, the arrangement density of the guide plates in the reaction section is greater than that of the guide plates in the feeding section and the discharging section; a plurality of oil gas outlet holes are arranged on the thermal cracking reaction kettle. The guide plates in the kettle body are designed in a segmented density of "sparse-dense-sparse", the waste tire rubber powder is controlled to enter the feeding section quickly, stay in the reaction section for sufficient cracking and discharge from the discharging section quickly, so that excessive pyrolysis is avoided; meanwhile, the oil gas outlet holes arranged opposite to the guide plates densely arranged in the reaction section are used for timely discharging the produced oil gas, so that the early generated oil gas molecules are prevented from further cracking or secondary polymerization reaction.

Description

Technical Field

[0001] This application relates to the field of waste tire recycling technology, and in particular to a waste tire pyrolysis device. Background Technology

[0002] In recent years, waste tire pyrolysis technology and equipment have developed rapidly, industry capacity has expanded, and process routes have become more mature. Ideally, pyrolysis carbon black, after iron removal and grinding, can replace some industrial carbon black in tires and rubber products, and pyrolysis oil can be made into oils for different uses after distillation and cutting. However, in actual production, the quality of pyrolysis products is mostly unstable and the performance is poor, resulting in low operating rates and unsatisfactory profitability for waste tire pyrolysis enterprises.

[0003] Existing pyrolysis reactors generally employ hot air heating or electric heating, with the powdered resin moving slowly forward via screw propulsion or reactor rotation. After a certain time and high-temperature pyrolysis, both carbon slag and oil / gas are discharged at the tail end of the reactor. The carbon slag is discharged from the bottom of the tail end and cooled by an auger before being transported to a temporary storage bin; the oil / gas enters the oil separator / cooler from the top of the tail end via an induced draft fan. This "same-end discharge" structure easily leads to the following technical problems: During the thermal cracking process, the earliest generated oil and gas molecules remain in the reactor for too long, which will further pyrolyze them into smaller molecules and some will undergo secondary polymerization reactions. This results in a high proportion of non-condensable gases, a large amount of light oil components, and a small amount of medium and heavy oil components in the final product. Consequently, the flash point of the cracked oil produced is often lower than 20°C (the flash point is the lowest temperature at which the vapor volatilized from the surface of a liquid can form a mixture with air and ignite when exposed to an ignition source under specified conditions; the lower the flash point, the greater the fire hazard), and may even be accompanied by a certain amount of water.

[0004] Furthermore, since both carbon slag and oil gas are discharged from the tail end, the oil gas has a longer path in the reactor, resulting in more oil gas inevitably being adsorbed on the surface and pores of the carbon slag. This leads to a high content of polycyclic aromatic hydrocarbons (PAHs) and low toluene transmittance in the cracked carbon black. At the same time, carbon slag dust is more likely to remain in the oil gas, increasing the impurities in the cracked oil.

[0005] Therefore, there is an urgent need for a new type of pyrolysis reactor that can regulate the pyrolysis reaction process, achieve effective separation of oil and gas from carbon slag, and improve the overall quality of the products. Summary of the Invention

[0006] To address the aforementioned deficiencies in the existing technology, this invention provides a waste tire pyrolysis device, which aims to achieve more precise control over the pyrolysis reaction process by optimizing the structure of the internal guide plate, the layout of the gas outlet, and the reaction pressure, thereby improving the overall quality of pyrolysis carbon black and pyrolysis oil.

[0007] This application provides a waste tire pyrolysis device, comprising a feeding conveyor, a pyrolysis reactor, an oil separator / cooler, a combustible gas purification system, and a flue gas purification system connected in sequence, as well as an oil storage tank and a carbon residue tank connected to the discharge end of the pyrolysis reactor and the discharge end of the oil separator / cooler, respectively. The pyrolysis reactor is characterized by being a horizontal rotating vessel, with a plurality of guide plates arranged along its axial direction on the inner wall of the reactor. These guide plates are sequentially divided into a feeding section, a reaction section, and a discharge section along the material feeding direction, wherein the arrangement density of the guide plates in the reaction section is greater than the arrangement density of the guide plates in the feeding section and the discharge section. The pyrolysis reactor is provided with several oil and gas outlet holes, and each of the oil and gas outlet holes is equipped with a dust filter screen. It also includes a pressure regulating suction assembly, which is connected to several of the oil and gas outlet holes, and is used to extract the flue gas and oil and gas generated during the reaction process and transport them to the oil separator cooler.

[0008] Preferably, the total length of the pyrolysis reactor is 15-20 meters, and the density of the guide plates in the feeding section and the discharging section is similar or the same. The arrangement density of the guide plates in the reaction section is 2-4 times that of the guide plates in the feed section or the discharge section, and the total length of the guide plates in the reaction section is not less than 1 / 3 of the total length of the pyrolysis reactor body.

[0009] Preferably, the oil and gas outlet includes a plurality of front outlets and rear outlets, wherein: All of the aforementioned front-end vents are located within the arrangement range of the flow guide plate of the reaction section, and the distance between the foremost end of the front-end vent and the feed end of the pyrolysis reactor is not less than 7 meters, and the distance between the last end and the discharge end of the pyrolysis reactor is not less than 5 meters. The rear exhaust port is located at the end of the pyrolysis reactor.

[0010] Preferably, the guide plate is a V-shaped or L-shaped plate-shaped metal structure with bent edges, with a height of 15-20cm and a thickness of not less than 5mm.

[0011] Preferably, the number of guide plates arranged along the circumference of the pyrolysis reactor in any section is not less than 12, and the gap between two adjacent guide plates in the axial direction of the pyrolysis reactor is in the range of 10-30cm.

[0012] Preferably, the pressure regulating suction assembly includes an induced draft fan, a pressure gauge, and a control center, wherein the induced draft fan is a variable frequency induced draft fan and is disposed between the oil and gas outlet and the oil separator cooler; The pressure gauge is used to monitor the internal pressure inside the pyrolysis reactor in real time. The control center is connected to the induced draft fan and the pressure gauge signal respectively, and can automatically adjust the real-time airflow of the induced draft fan according to the feedback of the pressure gauge to maintain the pressure inside the reactor within a preset range.

[0013] Preferably, the device further includes a nitrogen pressurization device, which is connected to the pressure regulating and suction assembly and is used to blow nitrogen into the pyrolysis reactor to replenish the pressure when the pressure inside the reactor is lower than a preset range.

[0014] Preferably, the dust filter screen is a multi-layer screen structure composed of sintered metal mesh, wherein the mesh size of the multiple layers of sintered metal mesh decreases from the inside to the outside, and the mesh size of the outermost layer of sintered metal mesh is not less than 200 mesh.

[0015] Preferably, the oil separator is a multi-stage water-cooled cooler, used to perform gradient cooling and separation of the output oil gas and flue gas according to their different boiling points, including a non-condensable gas outlet and a condensate oil outlet. The combustible gas purification system is connected to the non-condensable gas outlet of the oil separator cooler, and the input end of the oil storage tank is connected to the condensate oil outlet of the oil separator cooler.

[0016] This application also provides a method of using the waste tire pyrolysis device based on any one of the above claims, including the following steps: Waste tire rubber powder is continuously fed into the rotating pyrolysis reactor through the feed conveyor end, and the pyrolysis reaction is carried out in an atmospheric pressure and oxygen-deficient environment. The rubber powder is quickly introduced into the reaction section by sparsely arranging the guide plates in the feeding section of the reactor, and the residence time of the rubber powder is extended by tightly arranging the guide plates in the reaction section. After controlling the residence time of the rubber powder to 40-90 minutes, the carbon slag after the reaction is quickly discharged from the reactor by sparsely arranging the guide plates in the discharge section. The pressure regulating suction assembly, in conjunction with the oil and gas outlets located in the middle and rear areas of the reactor body, promptly draws the oil and gas generated by pyrolysis to the oil separator and subsequent processing components; and the pressure regulating suction assembly, in conjunction with the nitrogen pressurization device, maintains the pressure inside the reactor within the range of -500Pa to +500Pa. The finished oil, cooled by the oil separator and cooler, is stored in the oil storage tank, and the pyrolysis slag is transported to the slag tank for storage via the cooling auger.

[0017] The beneficial effects of this application are as follows: The waste tire pyrolysis apparatus and method of this application, by designing the guide plates in the reactor body with a "sparse-dense-sparse" segmented density, controls the rapid entry of waste tire rubber powder in the feeding section, its sufficient residence and pyrolysis in the reaction section, and its rapid discharge in the discharge section, so as to avoid over-pyrolysis. At the same time, the oil and gas vents arranged opposite to the densely arranged guide plates in the reaction section are used to exhaust the produced oil and gas in a timely manner, so as to prevent the early-generated oil and gas molecules from further cracking or undergoing secondary polymerization reactions, while venting the oil and gas in advance, reducing the contact and adsorption between the oil and gas and the carbon residue, and making the product distribution more reasonable. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the waste tire pyrolysis device provided in the embodiments of this application; Figure 2 This is a schematic diagram of the installation of the flow guide plate in the pyrolysis reactor body in an embodiment of this application.

[0020] Figure label: 1. Feeding and conveying end; 2. Pyrolysis reactor; 21. Reactor body; 22. Baffle plate; 3. Oil separator and cooler; 4. Combustible gas purification system; 5. Flue gas purification system; 61. Temporary oil storage tank; 62. Stagnant oil tank; 63. Finished oil tank; 7. Carbon slag tank. Detailed Implementation

[0021] The technical solutions of this application will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] The following is combined with Figure 1 and Figure 2 This describes the waste tire pyrolysis apparatus provided in the embodiments of this application.

[0023] Reference Figure 1 and Figure 2As shown in the embodiment of this application, a waste tire pyrolysis device includes a feeding conveyor 1, a pyrolysis reactor 2, an oil separator and cooler 3, a combustible gas purification system 4, a flue gas purification system 5, and an oil storage tank and a carbon residue tank 7, which are connected in sequence to the discharge end of the pyrolysis reactor 2 and the discharge end of the oil separator and cooler 3, respectively.

[0024] Specifically, the feeding and conveying end 1 includes a feeding conveyor, an online weighing mechanism, and a sealed conveying system connected in sequence. These are used to seal and convey a fixed quantity of waste tire rubber powder into the pyrolysis reactor 2, maintaining an oxygen-deficient environment inside the reactor. All of these are commercially available and mature feeding and conveying devices or components. For example, in some specific embodiments, the feeding conveyor can be a screw conveyor to lift the crushed waste tire rubber powder to the online weighing mechanism for weighing and quantification. The online weighing mechanism is a belt scale or a loss-in-weight scale, used to quantitatively control the feed rate. The sealed conveying system is a rotary sealing valve or a double gate valve, ensuring that outside air does not enter when the rubber powder enters the pyrolysis reactor 2, thus maintaining an oxygen-deficient environment inside the reactor. A cooling auger is also installed between the slag tank 7 and the pyrolysis reactor 2 to convey and cool the reacted slag. The oil storage tanks include a temporary oil tank 61, a static oil tank 62, and a finished oil tank 63 arranged in series, used for graded sedimentation and storage of the finished oil.

[0025] In some specific embodiments, the pyrolysis reactor 2 is a horizontal rotating vessel 21 with a total length of 15-20 meters and a diameter of approximately 1.6 to 2.2 meters. During installation, the vessel is tilted at an angle of approximately 0.5-1.5 degrees. Several guide plates 22 are welded along the axial direction of the inner wall of the vessel 21. These guide plates 22 are sequentially divided into three parts along the material feeding direction: a feeding section, a reaction section, and a discharge section. The density of the guide plates 22 in the feeding and discharge sections is similar or the same (similar means the difference in density between the two sections does not exceed 10%). The density of the guide plates 22 in the reaction section is 2-4 times, preferably 3 times, the density in the feeding or discharge section, to extend the reaction path and enhance the agitation effect, thereby improving the final reaction effect of the material in the reaction section. The total length of the reaction section is not less than 1 / 3 of the total length of the pyrolysis reactor 2 vessel 21.

[0026] In some specific embodiments, the guide plate 22 is a V-shaped or L-shaped plate-like metal structure with bent edges, and is inclinedly welded to the inner wall of the reactor body 21. Preferably, it is an L-shaped plate made of the same material as the reactor body 21, with a height of 15-20 cm and a thickness of not less than 2 cm. Specifically, the number of guide plates 22 arranged along the circumference of the pyrolysis reactor 2 in any section is not less than 12, and the gap between two adjacent guide plates 22 in the axial direction of the pyrolysis reactor 2 is between 5-20 cm. This "sparse-dense-sparse" arrangement allows the rubber powder to quickly enter the reaction section after preheating in the feeding section under the action of the sparse guide plates 22; in the reaction section, the residence time is extended and the reaction is fully agitated under the action of the dense guide plates 22; and in the discharge section, the carbon slag is quickly discharged under the action of the sparse guide plates 22, avoiding excessive residence and excessive mixing and adsorption with oil and gas, which would result in a low toluene transmittance index of the pyrolysis carbon black product.

[0027] For example, in this embodiment, the total length of the vessel body 21 of the pyrolysis reactor 2 is 18 meters, and the diameter is 1.6 meters. It is made of SUS316 stainless steel. The discharge section and the feed section have the same length and number of components, each approximately 4 meters long. The adjacent gap between two guide plates 22 is approximately 15 cm, and there are 12 guide plates arranged circumferentially. The reaction section is approximately 10 meters long, with a gap of approximately 6 cm between adjacent guide plates 22. There are 30 guide plates arranged circumferentially, meaning the density of the guide plates 22 in the reaction section is approximately 2.5 times that of the feed section. The guide plates 22 are L-shaped plate-like metal structures with bent edges, a height of 18 cm, and a thickness of 1 cm. This design ensures the effective agitation of the packing material while preventing breakage due to an imbalance in the length-to-thickness ratio.

[0028] In some specific embodiments, the pyrolysis reactor 2 is provided with several oil and gas outlets, including several front outlets and rear outlets. The front outlets are all located within the arrangement range of the flow guide plate 22 in the reaction section, and the distance L1 between the foremost end of the front outlet and the feed end of the pyrolysis reactor 2 is not less than 7 meters, and the distance L2 between the rearmost end and the discharge end of the pyrolysis reactor 2 is not less than 5 meters; the rear outlets are located at the end of the pyrolysis reactor 2. By setting the front outlets slightly rearward in the middle of the reactor body 21, most of the oil and gas generated by pyrolysis can be promptly extracted, preventing the oil and gas from mixing with carbon slag at the tail end of the reactor body 21 and effectively preventing secondary pyrolysis of the oil and gas and condensation and adsorption on the surface of the carbon slag.

[0029] Furthermore, dust filters are installed at several oil and gas outlets. Preferably, the dust filters are multi-layered screen structures composed of sintered metal mesh, with the mesh size decreasing progressively from the inside out. The outermost layer of sintered metal mesh should have a mesh size of no less than 200 mesh to achieve step-by-step interception of micron-sized carbon slag dust in the oil and gas, preventing dust from entering subsequent pipelines. The mesh size should not exceed 800 mesh. For example, in a specific implementation, the dust filters consist of three layers of sintered metal mesh, with mesh sizes from the inside out as follows: inner layer 100μm, middle layer 50μm, and outer layer 25μm (approximately 600 mesh), to avoid the filter mesh being too small and thus more easily clogged.

[0030] The device also includes a pressure regulating and suction assembly, which comprises an induced draft fan, a pressure gauge, and a control center. The induced draft fan is a variable frequency fan, positioned between the oil / gas outlet and the oil separator / cooler 3. Specifically, the input and output ends of the induced draft fan are connected to the oil / gas outlet and the oil separator / cooler 3 respectively via induced draft pipes. The pressure gauge is used to monitor the reaction pressure inside the pyrolysis reactor 2 in real time. The control center is a PLC controller, connected to both the induced draft fan and the pressure gauge. Based on feedback from the pressure gauge, the control center automatically adjusts the real-time airflow of the induced draft fan to maintain the pressure inside the reactor between -500 Pa and +500 Pa, preferably in a slightly positive pressure state between 100-400 Pa, to prevent outside air from entering the reactor through gaps and to avoid the risk of spontaneous combustion and flash explosion. It should be noted that the pressure range here is based on atmospheric pressure; -500 Pa indicates a slightly negative pressure, and +500 Pa indicates a slightly positive pressure.

[0031] Furthermore, the device also includes a nitrogen pressurization device, which is connected to the pressure regulating and suction assembly. This device is used to inject nitrogen into the pyrolysis reactor 2 when the pressure inside the reactor body 21 is lower than a preset range, thus preventing excessively low pressure from affecting the transport efficiency of oil, gas, and flue gas. Specifically, the nitrogen pressurization device includes a nitrogen source formed by a nitrogen cylinder or nitrogen generator and a pressurization pipe for transporting the nitrogen. The pressurization pipe is connected to the exhaust pipe of the pressure regulating and suction assembly. When the pressure inside the reactor is lower than a preset lower limit (e.g., -500Pa), the control center can activate the nitrogen pressurization device to inject nitrogen into the reactor for pressurization. Furthermore, the output end of the nitrogen pressurization device can be connected to each oil and gas outlet, allowing for periodic injection of reverse nitrogen into the outlets to reverse-blow away carbon black dust adhering to the surface of the dust filter, ensuring the filter and outlet remain unobstructed.

[0032] In the subsequent separation and treatment of oil and gas, the oil separator cooler 3 is a multi-stage water-cooled cooler used to perform gradient cooling and separation of the output oil and gas and flue gas according to their different boiling points, including a non-condensable gas outlet and a condensate oil outlet. The combustible gas purification system 4 is connected to the non-condensable gas outlet of the oil separator cooler 3, and the input end of the oil storage tank is connected to the condensate oil outlet of the oil separator cooler 3. The input end of the flue gas purification system 5 is connected to the output end of the combustible gas purification system 4. After being burned in a hot blast furnace, the purified combustible gas can be purified by the flue gas purification system 5 and then returned to the pyrolysis reactor 2 to heat the reactor body 21, realizing the internal recycling of energy.

[0033] Specifically, in some specific embodiments, the oil separator cooler 3 is a three-stage water-cooled cooler: the first-stage cooling structure temperature is set at 325℃, and the distillate is heavy oil fraction with a boiling point > 300℃; the second-stage cooling structure temperature is set at 250℃, and the distillate is diesel fraction with a boiling point between 180-300℃; the third-stage cooling structure temperature is set at 110℃, and the distillate is gasoline fraction with a boiling point < 180℃. The oil separator cooler 3 is provided with a non-condensable gas outlet and a condensate oil outlet, wherein the non-condensable gas outlet is located at the top of the oil separator cooler 3, and the condensate oil outlet is located at its bottom; the non-condensable gas, whose main components are methane, hydrogen, carbon monoxide, ethylene, etc., enters the combustible gas purification system 4, which includes an alkaline washing tower and an activated carbon adsorption bed, through the non-condensable gas outlet for purification. Part of the purified combustible gas is used to heat the vessel body 21 after combustion in a hot air furnace, and the other part is used for thermal power generation. The flue gas generated by combustion enters the flue gas purification system 5, which includes a bag filter and a desulfurization tower. After purification, it is either discharged into the air or introduced into the pyrolysis reactor 2 to heat the reactor body 21. The condensed oil, which is formed by mixing heavy oil, diesel oil, gasoline, etc., or transported separately, enters the corresponding oil storage tank through the condensed oil outlet.

[0034] The waste tire pyrolysis device provided in this application, by setting a front-end vent on the reactor body 21 located in the reaction section, and cooperating with a pressure regulating suction component, allows the generated oil and gas to leave the high-temperature zone in time in the later stage of the reaction, avoiding secondary cracking and polymerization reactions caused by the oil and gas staying in the reactor for a long time. This significantly improves the flash point and heavy oil ratio of the cracked oil, reduces the proportion of non-condensable gas and moisture content, thereby improving the final quality of the product. Since the oil and gas can be discharged in time from the middle or the middle rear of the reactor body 21, while the carbon slag continues to move towards the tail end for discharge, the gas-solid flow paths are staggered and separated, which can effectively prevent the oil and gas from condensing and adsorbing on the surface and pores of the carbon slag, thereby effectively improving the toluene transmittance of the cracked carbon black and reducing the polycyclic aromatic hydrocarbon content. A variable frequency induced draft fan, along with a pressure gauge and control center, is used to precisely control the pressure inside the reactor between a slight positive and a slight negative pressure, effectively preventing outside air from seeping in and disrupting the oxygen-deficient environment. Simultaneously, nitrogen pressurization and reverse purging functions ensure stable system pressure and the permeability of the filter. Based on the above device structure, this application embodiment also provides a method of using the above-mentioned waste tire pyrolysis device, including the following steps: Waste tire rubber powder is continuously fed into the vessel body 21 of the rotating pyrolysis reactor 2 through the feed conveyor end 1, and the pyrolysis reaction is carried out in an atmospheric pressure and oxygen-deficient environment. The sparse arrangement of the guide plates 22 in the feed section of the reactor body 21 allows the rubber powder to enter the reaction section quickly and preheat it. The close arrangement of the guide plates 22 in the reaction section extends the residence time of the rubber powder and enhances the agitation effect, thereby enhancing the reaction effect. The residence time of the rubber powder is controlled at 20-40 minutes to ensure that it reacts fully. The sparse arrangement of the guide plates 22 in the discharge section allows the carbon residue after the reaction to be quickly discharged from the reactor body 21, avoiding excessive residence and excessive adhesion between the residue and oil and gas. By using the pressure regulating suction assembly in conjunction with the oil and gas outlet holes located in the middle and tail areas of the reactor body 21, the oil and gas generated by pyrolysis are promptly led out to the oil separator cooler 3 and subsequent processing components, preventing the oil and gas from mixing with carbon slag at the tail end of the reactor body 21 and being discharged; and by using the pressure regulating suction assembly in conjunction with the nitrogen pressurization device, the gauge pressure inside the reactor is maintained within the range of -500Pa to +500Pa. The finished oil, cooled by the oil separator and cooler 3, is stored in a graded manner through an oil storage tank, and the reacted carbon residue is transported to the carbon residue tank 7 for storage through a cooling auger.

[0035] For example, the following example uses waste tire rubber powder with a particle size of 8-24 mesh and a moisture content of <5% as a filler, and provides a detailed explanation: Waste tire rubber powder is conveyed to the online weighing mechanism via a feeding conveyor. After being quantitatively fed at 1000 kg / h, it is continuously fed into the pyrolysis reactor 2 via a sealed conveying system. The reactor body 21 rotates at a speed of 1-1.5 rpm and is preheated to 450°C inside by a hot air furnace.

[0036] After the rubber powder enters the reactor body 21, it moves rapidly towards the reaction section under the action of the sparse guide plates 22 in the feeding section, and is preheated at the same time. After entering the reaction section, the closely arranged guide plates 22 extend the residence time of the rubber powder to about 30 minutes, allowing for complete thermal pyrolysis in an oxygen-deficient environment at 450℃ and atmospheric pressure. The oil and gas generated by pyrolysis are promptly drawn out through the front and rear exhaust ports by the induced draft fan. The induced draft fan automatically adjusts its speed based on the pressure gauge feedback to maintain the gauge pressure inside the reactor at about 400Pa. If the pressure drops below -500Pa, the pressure is automatically replenished by a nitrogen pressurization device.

[0037] The extracted oil and flue gas enter the oil separator 3, where they undergo three stages of cooling and separation: heavy oil is obtained at 325℃, diesel oil at 250℃, and gasoline at 110℃. The remaining non-condensable gas enters the combustible gas purification system 4, and the purified combustible gas is reused to heat the reactor body 21. The condensed oil is stored in the temporary storage tank 61, the settling tank 62, and the finished product tank 63. The carbon residue after the reaction is discharged from the outlet end of the reactor body 21, cooled to below 50℃ by a cooling auger, and then sent to the carbon residue tank 7.

[0038] During operation, every 8 hours, the control center automatically activates the backflushing mode of the nitrogen pressurization device, spraying nitrogen in the opposite direction to each oil and gas outlet for 1-3 seconds to clean the dust filter and prevent excessive clogging of the dust filter from affecting the normal transport of flue gas and oil and gas.

[0039] Specifically, the waste tire pyrolysis apparatus provided in this application embodiment can be used to perform the above-described production method to achieve the desired technical effect, which will not be elaborated further here.

[0040] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0041] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0043] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0044] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A waste tire pyrolysis device, comprising a feed conveying end, a pyrolysis reactor, an oil separator / cooler, a combustible gas purification system, and a flue gas purification system connected in sequence, and an oil storage tank and a slag tank respectively connected to the discharge end of the pyrolysis reactor and the discharge end of the oil separator / cooler, characterized in that, The pyrolysis reactor is a horizontal rotating vessel. The inner wall of the pyrolysis reactor is provided with several guide plates along its axial direction. The guide plates are divided into three parts in sequence along the material feeding direction: feeding section, reaction section and discharge section. The arrangement density of the guide plates in the reaction section is greater than that in the feeding section and discharge section. The pyrolysis reactor is provided with several oil and gas outlet holes, and each of the oil and gas outlet holes is equipped with a dust filter screen. It also includes a pressure regulating suction assembly, which is connected to several of the oil and gas outlet holes, and is used to extract the flue gas and oil and gas generated during the reaction process and transport them to the oil separator cooler.

2. The waste tire pyrolysis apparatus according to claim 1, characterized in that, The total length of the pyrolysis reactor is 15-20 meters, and the density of the guide plates in the feeding section and the discharging section is similar or the same. The arrangement density of the guide plates in the reaction section is 2-4 times that of the guide plates in the feed section or the discharge section, and the total length of the guide plates in the reaction section is not less than 1 / 3 of the total length of the pyrolysis reactor body.

3. The waste tire pyrolysis device according to claim 2, characterized in that, The oil and gas outlet includes several front outlets and rear outlets, wherein: All of the aforementioned front-end vents are located within the arrangement range of the flow guide plate of the reaction section, and the distance between the foremost end of the front-end vent and the feed end of the pyrolysis reactor is not less than 7 meters, and the distance between the last end and the discharge end of the pyrolysis reactor is not less than 5 meters. The rear exhaust port is located at the end of the pyrolysis reactor.

4. The waste tire pyrolysis apparatus according to claim 3, characterized in that, The deflector is a V-shaped or L-shaped plate-shaped metal structure with bent edges, with a height of 15-20cm and a thickness of not less than 5mm.

5. The waste tire pyrolysis apparatus according to claim 4, characterized in that, The number of guide plates arranged along the circumference of the pyrolysis reactor in any section shall not be less than 12, and the gap between two adjacent guide plates in the axial direction of the pyrolysis reactor shall be in the range of 10-30cm.

6. The waste tire pyrolysis apparatus according to claim 1, characterized in that, The pressure regulating suction assembly includes an induced draft fan, a pressure gauge, and a control center. The induced draft fan is a variable frequency induced draft fan, which is located between the oil and gas outlet and the oil separator cooler. The pressure gauge is used to monitor the internal pressure inside the pyrolysis reactor in real time. The control center is connected to the induced draft fan and the pressure gauge signal respectively, and can automatically adjust the real-time airflow of the induced draft fan according to the feedback of the pressure gauge to maintain the pressure inside the reactor within a preset range.

7. The waste tire pyrolysis apparatus according to claim 6, characterized in that, The device also includes a nitrogen pressurization device, which is connected to the pressure regulating and suction assembly and is used to blow nitrogen into the pyrolysis reactor to replenish the pressure when the pressure inside the reactor is lower than a preset range.

8. The waste tire pyrolysis apparatus according to claim 1, characterized in that, The dust filter screen is a multi-layer screen structure composed of sintered metal mesh. The mesh size of the multiple layers of sintered metal mesh decreases from the inside to the outside, and the mesh size of the outermost layer of sintered metal mesh is not less than 200 mesh.

9. The waste tire pyrolysis apparatus according to claim 7, characterized in that, The oil separator is a multi-stage water-cooled cooler used to perform gradient cooling and separation of the output oil gas and flue gas according to their different boiling points, including a non-condensable gas outlet and a condensate oil outlet. The combustible gas purification system is connected to the non-condensable gas outlet of the oil separator cooler, and the input end of the oil storage tank is connected to the condensate outlet of the oil separator cooler.

10. The method of using the waste tire pyrolysis apparatus according to any one of claims 1-9, characterized in that, Includes the following steps: Waste tire rubber powder is continuously fed into the rotating pyrolysis reactor through the feed conveyor end, and the pyrolysis reaction is carried out in an atmospheric pressure and oxygen-deficient environment. The rubber powder is quickly introduced into the reaction section by sparsely arranging the guide plates in the feeding section of the reactor, and the residence time of the rubber powder is extended by tightly arranging the guide plates in the reaction section. After controlling the residence time of the rubber powder to 40-90 minutes, the carbon slag after the reaction is quickly discharged from the reactor by sparsely arranging the guide plates in the discharge section. The pressure regulating suction assembly, in conjunction with the oil and gas outlets located in the middle and rear areas of the reactor body, promptly draws the oil and gas generated by pyrolysis to the oil separator and subsequent processing components; and the pressure regulating suction assembly, in conjunction with the nitrogen pressurization device, maintains the pressure inside the reactor within the range of -500Pa to +500Pa. The finished oil, cooled by the oil separator and cooler, is stored in the oil storage tank, and the pyrolysis slag is transported to the slag tank for storage via the cooling auger.

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