Cracking processing system for waste tire powder

Abstract

The invention provides a cracking processing system for waste tire powder, belongs to the technical field of tire recovery, and solves the problems that in the prior art, pollution is large, and large-scale treatment capacity cannot be formed. The device comprises a regenerator, a reaction settler and a mixing tank, the reaction settler is communicated with a lifting pipe, a gas-solid separation device is arranged at an outlet of the lifting pipe, a nozzle is arranged on the lifting pipe, a waste tire powder inlet, a heavy oil inlet and a heating device are arranged on the mixing tank, and the mixing tank is connected with a slurry buffer tank through a pipeline. The slurry buffer tank is communicated with the nozzle through a pipeline. Waste tire powder and heavy oil are mixed to form feed liquid, the feed liquid enters the lifting pipe through the nozzle for reaction, and the gas-solid separation device is arranged, so that the gas-solid contact time of reaction oil gas and a catalyst is shortened, side reactions such as olefin condensation and coking are reduced, the conversion rate and selectivity of the catalyst are higher, and the yield of the catalyst is increased. And the generation of coke at the reaction settler part is reduced, and the production period is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of tire recycling, and in particular belongs to a cracking and processing system for waste tire powder. Background Art

[0002] Since the beginning of the 21st century, the automobile industry has flourished, and the amount of scrapped tires has increased rapidly, with an annual output of 30 million tons of scrap tires, while the recycling rate is less than 25%. In my country alone, 100 million scrap tires are produced each year, and only about 15% are recycled; from the beginning of use to the end of use, the natural loss of rubber is only 10-15%, but 90% of tires and 100% of tire skeleton materials are discarded and not recycled, which not only causes a large waste of resources, but also causes great harm to the ecological environment. Therefore, the effective use of recycling technology to recycle scrap tires, improve resource utilization and improve the environment has become a hot topic around the world.

[0003] There are two main methods for the pyrolysis of waste tires in my country: the first method is to mainly use traditional oil refining, but this method will cause great pollution to the surrounding environment. The second method is the pyrolysis method of rotary kiln and chain rotary kiln. The unreasonable design of the furnace structure and heating method of this method leads to a dirty production environment, easy deformation of equipment, long production cycle and low output. The annual production capacity of each line generally does not exceed 10,000 tons.

[0004] The prior art, such as a tire pyrolysis recovery and treatment system and a treatment method disclosed in the patent with publication number CN119286549A, includes a support component, a heating component, a ring opening is opened inside the heating furnace located on the left side of the burner, a drop opening connected to the inside of the ring opening is opened at the bottom of the heating furnace, a pyrolysis component, including a rotary furnace located inside the heating furnace and a treatment furnace fixed inside the rotary furnace, a linkage tooth ring meshed with the main tooth plate is fixed on the surface side of the treatment furnace outside the rotary furnace, a conveying and closing component, including a closing plate, a conveying frame located inside the treatment furnace and a movable plate located directly below the conveying frame, and a linkage locking component. The invention discharges carbon black comprehensively through the coordinated use of the inner oblique ring plate and the ring opening to avoid the accumulation of carbon black in the furnace. At the same time, the coordinated use of the conveying and closing component and the linkage locking component realizes the integrated conveying and closing work, improves the work efficiency, and realizes the work without the cooperation of multiple people. However, this tire pyrolysis technology is highly polluting and cannot form a large-scale processing capacity. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide a cracking processing system for waste tire powder, in which waste tire powder is mixed with heavy oil to form a feed liquid, the feed liquid enters the riser through a nozzle, and a catalytic cracking reaction is carried out under the action of a fluidized catalyst. A gas-solid separation device is arranged at the outlet of the riser to reduce the gas-solid contact time between the reaction oil gas and the catalyst, thereby reducing side reactions such as olefin condensation and coking, making the conversion rate and selectivity of the catalyst higher, and reducing the generation of coke in the reaction settler, thereby extending the production cycle; using the cracking processing system of the present application, the single-line capacity of the waste tire powder processing scale can be expanded to more than 100,000 tons / year, greatly increasing the economic benefits.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A pyrolysis processing system for waste tire powder comprises a regenerator, a reaction settler and a mixing tank, wherein the reaction settler is connected with a lifting pipe, a gas-solid separation device is arranged at the outlet of the lifting pipe, the reaction settler is connected with a waiting-to-be-regenerated inclined pipe communicating with the regenerator, the regenerator is connected with a regeneration inclined pipe communicating with the lifting pipe, a nozzle is arranged on the lifting pipe, a waste tire powder inlet, a heavy oil inlet and a heating device are arranged on the mixing tank, the mixing tank is connected with a slurry buffer tank through a pipeline, and the slurry buffer tank is communicated with the nozzle through a pipeline.

[0008] Preferably, the lifting pipe is provided with a lifting medium inlet, a recycled liquefied gas inlet, and a recycled oil or oil slurry inlet in order from bottom to top, and the connection between the regeneration inclined pipe and the lifting pipe is located between the lifting medium inlet and the recycled liquefied gas inlet.

[0009] Preferably, the riser is provided with an expanded diameter section, and the expanded diameter section is provided with a dilution steam inlet.

[0010] Preferably, the gas-solid separation device includes a VQS fast separator arranged on the lifting pipe, a VQS closing cover arranged on the outside of the VQS fast separator is arranged in the reaction settler, the side wall of the VQS closing cover is connected to a single-stage cyclone separator located on the outside of the VQS closing cover, and a reaction oil and gas outlet communicating with the top of the single-stage cyclone separator is arranged on the top of the reaction settler.

[0011] Preferably, a stripping section is provided at the bottom of the reaction settler, and the connection between the inclined tube to be produced and the reaction settler is located below the stripping section.

[0012] Preferably, the regenerator includes a first regenerator connected to the inclined tube to be regenerated, a first main air distribution pipe is arranged in the first regenerator, a second regenerator connected to the regeneration inclined tube is connected to the top of the first regenerator, a second main air distribution pipe is arranged in the second regenerator, a two-stage cyclone separator located above the second main air distribution pipe is arranged in the second regenerator, and the two-stage cyclone separator is connected to an air collecting chamber.

[0013] Preferably, an external heat exchanger is arranged on the outside of the regenerator, a feed pipe communicating with the second regenerator and a discharge pipe communicating with the first regenerator are connected to the external heat exchanger, and a fluidizing air inlet is arranged on the external heat exchanger.

[0014] Preferably, a slurry filtering system is provided on the pipeline between the slurry buffer tank and the nozzle.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0016] Waste tire powder is mixed with heavy oil to form a feed liquid, which enters the riser through a nozzle and undergoes a catalytic cracking reaction under the action of a fluidized catalyst. A gas-solid separation device is arranged at the outlet of the riser to reduce the gas-solid contact time between the reaction oil gas and the catalyst, thereby reducing side reactions such as olefin condensation and coking, making the catalyst more efficient and selective, and reducing the generation of coke in the reaction settler, thereby extending the production cycle. The pyrolysis processing system of the present application can expand the single-line capacity of waste tire powder processing to more than 100,000 tons / year, greatly increasing the economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic diagram of a flow chart provided for an embodiment of the present invention.

[0019] Reference numerals: 1-lifting medium inlet; 2-recycled liquefied gas inlet; 3-nozzle; 4-dilution steam inlet; 5-recycled oil or oil slurry inlet; 6-waste tire powder inlet; 7-heavy oil inlet; 8-lower stripping steam distributor; 9-upper stripping steam distributor; 10-reaction settler; 11-single-stage cyclone separator; 12-reaction oil and gas outlet; 13-VQS closing cover; 14-VQS quick separator; 15-stripping baffle; 16-stripping section; 17-waiting inclined pipe; 18-waiting slide valve; 19 -mixing tank; 20-heating device; 21-expanding section; 22-regeneration inclined pipe; 23-regeneration slide valve; 24-gas collecting chamber; 25-first regenerator; 26-two-stage cyclone separator; 27-second regenerator; 28-second main air distribution pipe; 29-feed pipe; 30-external heat exchanger; 31-fluidizing air inlet; 32-slide valve; 33-discharge pipe; 34-first main air distribution pipe; 35-slurry buffer tank; 36-slurry pump; 37-waste recovery pipe; 38-slurry filtration system; 39-lifting pipe. DETAILED DESCRIPTION

[0020] 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, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0022] In the description of the present invention, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the application is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0023] Combine the following Figure 1 The present invention is described in detail.

[0024] Example

[0025] A pyrolysis processing system for waste tire powder includes a regenerator, a reaction settler 10 and a mixing tank 19, wherein the reaction settler 10 is connected with a lifting pipe 39, a gas-solid separation device is arranged at the outlet of the lifting pipe 39, the reaction settler 10 is connected with a waiting inclined pipe 17 communicating with the regenerator, the regenerator is connected with a regeneration inclined pipe 22 communicating with the lifting pipe 39, a nozzle 3 is arranged on the lifting pipe 39, a waste tire powder inlet 6, a heavy oil inlet 7 and a heating device 20 are arranged on the mixing tank 19, the mixing tank 19 is connected with a slurry buffer tank 35 through a pipeline, and the slurry buffer tank 35 is connected with the nozzle 3 through a pipeline. The lifting pipe 39 is a built-in lifting pipe, that is, the lifting pipe 39 extends from the bottom of the reaction settler 10 into the reaction settler 10.

[0026] The waste tire powder and heavy oil are mixed in the mixing tank 19. During the mixing process, a heating device 20 (the heating device 20 is an electric heating belt or a steam heating half pipe) is used for heating to form a feed liquid of the waste tire powder and the heavy oil. The feed liquid passes through the slurry buffer tank 35 and is sprayed from the nozzle 3 into the riser 39. A catalytic cracking reaction is carried out under the action of a fluidized catalyst. A gas-solid separation device is arranged at the outlet of the riser 39 to reduce the gas-solid contact time between the reaction oil gas and the catalyst, thereby reducing side reactions such as olefin condensation and coking, thereby increasing the conversion rate and selectivity of the catalyst, and reducing the generation of coke in the reaction settler, thereby extending the production cycle. The pyrolysis processing system of the present application can expand the single-line capacity of the waste tire powder processing scale to more than 100,000 tons / year, thereby greatly increasing the economic benefits.

[0027] The catalyst in the riser 39 is separated by the gas-solid separation device and then enters the regenerator from the waiting inclined pipe 17 for charring and regeneration. The regenerated catalyst enters the riser 39 from the regeneration inclined pipe 22 for recycling. The waiting inclined pipe 17 is provided with a waiting slide valve 18, and the regeneration inclined pipe 22 is provided with a regeneration slide valve 23. The slide valves are used to control the catalyst circulation amount or cut off the catalyst circulation.

[0028] The lifting pipe 39 is provided with a lifting medium inlet 1, a recycled liquefied gas inlet 2, and a recycled oil or oil slurry inlet 5 in order from bottom to top, and the connection between the regeneration inclined pipe 22 and the lifting pipe 39 is located between the lifting medium inlet 1 and the recycled liquefied gas inlet 2. The nozzle 3 is arranged between the recycled liquefied gas inlet 2 and the recycled oil or oil slurry inlet 5. The lifting medium inlet 1 inputs the lifting medium into the lifting pipe 39 to blow the catalyst upwards, and the catalyst contacts the recycled liquefied gas output from the recycled liquefied gas inlet 2 to cause a cracking reaction of the liquefied gas; and then contacts the feed liquid sprayed from the nozzle 3 to rapidly cause a catalytic cracking or cracking reaction.

[0029] The lower part of the riser 39 is provided with an expansion section 21, which can adjust the reaction time and reaction temperature of catalytic cracking well according to the amount of waste tire powder, so as to flexibly adjust the reaction time and reaction depth requirements to obtain a good product yield; the expansion section 21 is provided with a dilution steam inlet 4, which can adjust the dilution steam flow rate according to the change of the feed liquid amount or the change of the production plan, and adjust the time or reaction depth of the catalytic cracking or catalytic cracking reaction. The recycled oil or oil slurry inlet 5 is provided on the expansion section 21, which can transport the incompletely converted oil to the riser 39 for further conversion, and can also adjust the heat balance of the reaction settler-regenerator.

[0030] The gas-solid separation device includes a VQS quick-separation head 14 arranged on the riser 39, a VQS closed cover 13 arranged outside the VQS quick-separation head 14 is arranged in the reaction settler 10, the side wall of the VQS closed cover 13 is connected with a single-stage cyclone separator 11 located outside the VQS closed cover 13, and the top of the reaction settler 10 is provided with a reaction oil and gas outlet 12 connected with the top of the single-stage cyclone separator 11. The mixed catalyst and cracked oil and gas are thrown out from the VQS quick-separation head 14, and under the action of centrifugal force, the catalyst particles are thrown to the inner wall of the VQS closed cover 13, thereby realizing gas-solid separation, and the separated oil and gas are separated again through the single-stage cyclone separator 11, and finally enter the reaction oil and gas outlet 12.

[0031] In the VQS fast separator 14, the larger particles of catalyst are captured, the efficiency reaches more than 90%, the outlet gas phase enters the single-stage cyclone separator 11 along the riser, the single-stage cyclone separation efficiency is also more than 90%, the total efficiency after separation by the VQS fast separator 14 and the single-stage cyclone separator 11 is more than 99.99%, and the single-stage cyclone separator 11 is arranged in groups of 4 to 12. The gas-solid separation device of the present application adopts a VQS fast separator, which can also be replaced by a coarse cyclone separator.

[0032] The bottom of the reaction settler 10 is provided with a stripping section 16, and the connection between the to-be-regenerated inclined pipe 17 and the reaction settler 10 is located below the stripping section 16. The stripping section 16 strips the separated to-be-regenerated catalyst, and the stripping section 16 uses steam to replace the reaction gas entrained in the to-be-regenerated catalyst to avoid waste of raw materials. The replaced clean to-be-regenerated catalyst enters the regenerator from the to-be-regenerated inclined pipe 17 for charring and regeneration. The stripping section 16 is provided with a lower stripping steam distributor 8, an upper stripping steam distributor 9 and a stripping baffle 15.

[0033] The regenerator includes a first regenerator 25 connected to the oblique pipe 17 to be regenerated, a first main air distribution pipe 34 is arranged in the first regenerator 25, a second regenerator 27 connected to the regeneration oblique pipe 22 is connected to the top of the first regenerator 25, a second main air distribution pipe 28 is arranged in the second regenerator 27, a two-stage cyclone separator 26 located above the second main air distribution pipe 28 is arranged in the second regenerator 27, and the two-stage cyclone separator 26 is connected to the gas collecting chamber 24. After the catalyst to be regenerated is initially charred and regenerated in the first regenerator 25, it enters the second regenerator 27 for further charring to restore the good activity of the catalyst. The two-stage cyclone separator 26 separates the catalyst in the gas to prevent the catalyst from being discharged from the regenerator.

[0034] An external heat exchanger 30 is provided on the outside of the regenerator, and a feed pipe 29 connected to the second regenerator 27 and a discharge pipe 33 connected to the first regenerator 25 are connected to the external heat exchanger 30, and a fluidizing air inlet 31 is provided on the external heat exchanger 30. The external heat exchanger 30 can recover heat from the regenerated catalyst to improve the utilization rate of heat. A slide valve 32 is provided in the discharge pipe 33 to control the amount of regenerated catalyst discharged into the regenerator.

[0035] A slurry filtration system 38 is provided on the pipeline between the slurry buffer tank 35 and the nozzle 3. The slurry filtration system 38 can filter the feed liquid to prevent large particles from clogging the nozzle 3. A slurry pump 36 is provided in the pipeline between the slurry filtration system 38 and the slurry buffer tank 35, and a stirring device is provided in the mixing tank 19 and the slurry buffer tank 35. A waste recovery pipe 37 is provided at the bottom of the slurry buffer tank 35 to recover impurities.

[0036] Relevant parameters of the cracking processing system:

[0037] The waste tires are crushed and iron removed, and then pulverized in a ball mill with a particle size of 30 to 80 μm; the waste tire powder is put into a mixing tank 19 for mixing with heavy oil, the temperature of the heavy oil is 200 to 250°C, the pressure is 0.1 to 0.5 MPa, and the mixing time is 20 to 500 seconds; the mixed material in the mixing tank 19 has a temperature of 250 to 330°C, a pressure of 0.1 to 0.45 MPa, and a reaction time of 120 to 300 seconds; the temperature of the riser 39 is 510 to 530°C, the pressure is 0.2 to 0.4 MPa, and the reaction time is 2 to 6 seconds, and the rare earth oxides, alkali metal oxides, ZSM-5 and The microsphere catalyst composed of ZRP molecular sieve and AL2O3 carrier is used for catalytic cracking of mixed crude oil or catalytic cracking to prepare oil products including light hydrocarbon gas, liquefied gas, gasoline, diesel and the like under the condition of catalyst-oil ratio of 6-20, preferably 6-10. The processing volume of the waste tire powder can be adjusted within 50,000 to 300,000 tons per year according to the conditions of the waste tire powder raw material, so that the cracking of the waste tire powder is carried out under the condition of catalyst, thereby optimizing the cracking product. The carbon black contained in the waste tire powder enters the regenerator with the catalyst circulation to be burned to generate heat to generate steam and heat the waste tire powder.

[0038] Compared with the prior art, the present application can greatly increase the processing volume of waste tire powder; the lower expanded diameter lifting pipe 39 is provided to well meet the variation of waste tire powder, so that it can adapt to the waste tire powder volume on the market in a larger range, and the operation flexibility is large; the present application can change the reaction temperature and reaction time according to the processing volume of waste tire powder and market product demand, and appropriately adjust its product distribution; the single-line waste tire powder processing volume of the present application can be adjusted within 50,000 to 300,000 tons / year, which changes the original limitation that the single line can only process 10,000 tons per year, and well solves the processing volume problem of the existing device; the present application adopts a catalytic cracking device fluidized bed to process waste tire powder, which solves the environmental protection problem of the existing waste tire powder device; the present application transfers the carbon black in the waste tire powder to the regenerator for burning to generate heat, thereby generating medium-pressure steam, and fully utilizes the carbon black in the waste tire powder.

[0039] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pyrolysis processing system for waste tire powder, characterized in that: The invention comprises a regenerator, a reaction settler (10) and a mixing tank (19), wherein the reaction settler (10) is connected to a lifting pipe (39), a gas-solid separation device is arranged at the outlet of the lifting pipe (39), the reaction settler (10) is connected to a waiting inclined pipe (17) communicating with the regenerator, the regenerator is connected to a regeneration inclined pipe (22) communicating with the lifting pipe (39), a nozzle (3) is arranged on the lifting pipe (39), a waste tire powder inlet (6), a heavy oil inlet (7) and a heating device (20) are arranged on the mixing tank (19), the mixing tank (19) is connected to a slurry buffer tank (35) through a pipeline, and the slurry buffer tank (35) is connected to the nozzle (3) through a pipeline.

2. A pyrolysis processing system for waste tire powder according to claim 1, characterized in that: The lifting pipe (39) is provided with a lifting medium inlet (1), a recycled liquefied gas inlet (2), and a recycled oil or oil slurry inlet (5) in sequence from bottom to top, and the connection point between the regeneration inclined pipe (22) and the lifting pipe (39) is located between the lifting medium inlet (1) and the recycled liquefied gas inlet (2).

3. A pyrolysis processing system for waste tire powder according to claim 1, characterized in that: The riser (39) is provided with an expanded diameter section (21), and the expanded diameter section (21) is provided with a dilution steam inlet (4).

4. A pyrolysis processing system for waste tire powder according to claim 1, characterized in that: The gas-solid separation device comprises a VQS quick separator (14) arranged on a lifting pipe (39); a VQS closed cover (13) arranged outside the VQS quick separator (14) is arranged in a reaction settler (10); a side wall of the VQS closed cover (13) is connected to a single-stage cyclone separator (11) located outside the VQS closed cover (13); and a reaction oil and gas outlet (12) communicating with the top of the single-stage cyclone separator (11) is arranged at the top of the reaction settler (10).

5. The pyrolysis processing system of waste tire powder according to claim 1, characterized in that: A stripping section (16) is provided at the bottom of the reaction settler (10), and the connection between the inclined pipe to be produced (17) and the reaction settler (10) is located below the stripping section (16).

6. The pyrolysis processing system of waste tire powder according to claim 1, characterized in that: The regenerator comprises a first regenerator (25) connected to the inclined tube (17) to be regenerated, a first main air distribution pipe (34) being arranged in the first regenerator (25), a second regenerator (27) connected to the regeneration inclined tube (22) being connected at the top of the first regenerator (25), a second main air distribution pipe (28) being arranged in the second regenerator (27), a two-stage cyclone separator (26) located above the second main air distribution pipe (28) being arranged in the second regenerator (27), and the two-stage cyclone separator (26) being connected to an air collecting chamber (24).

7. A pyrolysis processing system for waste tire powder according to claim 6, characterized in that: An external heat exchanger (30) is arranged on the outside of the regenerator, and a feed pipe (29) connected to the second regenerator (27) and a discharge pipe (33) connected to the first regenerator (25) are connected to the external heat exchanger (30). A fluidizing air inlet (31) is arranged on the external heat exchanger (30).

8. The pyrolysis processing system for waste tire powder according to claim 1, characterized in that: A slurry filtering system (38) is provided on the pipeline between the slurry buffer tank (35) and the nozzle (3).

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