Feeding device of waste plastic reactor and waste plastic reaction system

Abstract

The invention discloses a waste plastic reactor feeding device and a waste plastic reaction system.The waste plastic reactor feeding device comprises an extruding machine, a baffle, a connecting channel, a discharging valve, an oxygen-free bin and a spiral feeder, and the baffle is arranged in the extruding machine and close to the discharging end of the extruding machine; the connecting channel is connected with the discharge end of the extruder; the discharging valve is arranged in the connecting channel, and the discharging valve, the baffle, the connecting channel and the extruding machine define a gas replacement chamber. The oxygen-free stock bin is respectively connected with the connecting channel and the spiral feeder; and the spiral feeder is used for transporting the plastic fragments into the reactor. The entering plastic fragments are extruded through a material extruding machine, so that air in the plastic fragments is preliminarily discharged; the gas replacement chamber is used for replacing air in the plastic fragments through introduced inert gas, so that the content of the air entering the reactor along with the plastic fragments reaches the standard, the potential safety hazard of explosion is avoided, and the safety of the device is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of chemical recovery of waste plastics, and specifically relates to a waste plastic reactor feeding device and a waste plastic reaction system. Background Art

[0002] With the national "dual carbon" development strategy, waste plastic chemical recycling technology has ushered in new development opportunities. Traditional waste plastic chemical recycling technology has low requirements on the oxygen content and feed particle size in the feed, and mostly adopts two-stage screw conveying or extrusion exhaust of waste plastics.

[0003] Chemical recycling of waste plastics generally uses pyrolysis or catalytic cracking. Regardless of pyrolysis or catalytic cracking, the reactor is in a high-temperature environment. The feeding device in the above two processes feeds the reactor. The air content entering the reactor with the waste plastic is high, posing a safety hazard of explosion. Summary of the invention

[0004] In order to solve the technical problem in the prior art that the air content entering the reactor along with the waste plastics is high and there is a potential safety hazard of explosion, the present application provides a waste plastic reactor feeding device and a waste plastic reaction system.

[0005] In a first aspect of the present application, a feeding device for a waste plastic reactor is provided, comprising an extruder, a baffle, a connecting channel, a discharge valve, an oxygen-free silo and a screw feeder, wherein:

[0006] The extruder is used to extrude the incoming plastic fragments to preliminarily expel the air in the plastic fragments;

[0007] The baffle is arranged in the extruder and is arranged close to the discharge end of the extruder;

[0008] The connecting channel is connected to the discharge end of the extruder;

[0009] The unloading valve is arranged in the connecting channel, and the unloading valve, the baffle, the connecting channel and the extruder form a gas replacement chamber, and the gas replacement chamber is used to replace the air in the plastic fragments with the inert gas introduced so that the oxygen content of the plastic fragments meets the standard;

[0010] The inlet of the anaerobic silo is connected to the connecting channel, and the outlet is connected to the screw feeder;

[0011] The screw feeder is used to transport the plastic chips into the reactor.

[0012] In some optional embodiments, it further includes a discharge channel and a cooling jacket; the discharge channel is connected to the screw feeder and the reactor respectively; the cooling jacket is arranged on the outer wall of the discharge channel for cooling the discharge channel.

[0013] In some alternative embodiments, the cooling jacket at least includes an outer jacket, which is sleeved on the discharge channel, and the outer jacket is cooled by circulating cooling water.

[0014] In some alternative embodiments, the cooling jacket further includes an inner jacket, which is sleeved on the outer wall of the discharge channel near the discharge end and is located in the outer jacket, and the inner jacket is cooled by an inert gas.

[0015] In some alternative embodiments, a cyclone separator is further included, and the cyclone separator is arranged at the discharge end of the discharge channel.

[0016] In some alternative embodiments, a vibrating screen is further included, and the vibrating screen is arranged on the connection channel and is close to the anaerobic storage bin.

[0017] In some alternative embodiments, the feed valve is a slide valve.

[0018] In some alternative embodiments, the cross-sectional area of the connection channel is larger than that of the extruder.

[0019] In some alternative embodiments, a storage bin is further included, and the storage bin is connected to the extruder for storing plastic fragments and supplying plastic fragments to the extruder.

[0020] In the second aspect of the present application, a waste plastic reaction system is provided, which includes a reactor and the waste plastic reactor feeding device according to the first aspect, and the reactor is connected to the screw feeder.

[0021] A waste plastic reactor feeding device according to one or more embodiments of the present application has the following

[0022] Beneficial effects compared with the prior art:

[0023] The plastic fragments entering are extruded by the extruder to initially discharge the air in the plastic fragments; the feed valve, the baffle, the connection channel and the extruder enclose a gas replacement chamber, and the gas replacement chamber replaces the air in the plastic fragments with the introduced inert gas to make the oxygen content of the plastic fragments meet the standard, and then it is supplied to the reactor through the anaerobic storage bin and the screw feeder, so that the air content entering the reactor with the plastic fragments is relatively low, avoiding the potential safety hazard of explosion and improving the safety of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The structural schematic diagram of the waste plastic reactor feeding device in one or more embodiments of the present application is shown;

[0025] Figure 2 Shows a schematic structural diagram of a waste plastic reaction system in one or more embodiments of the present application.

[0026] Explanation of reference numerals: 100 - gas replacement chamber; 1 - extruder; 2 - baffle; 3 - connection channel; 4 - blanking valve; 5 - oxygen-free silo; 6 - screw feeder; 7 - discharge channel; 8 - cooling jacket, 81 - outer jacket, 82 - inner jacket; 9 - cyclone separator; 10 - vibrating screen; 11 - storage silo; 12 - reactor; 13 - fan. Detailed implementation manners

[0027] In order to enable those skilled in the art in the technical field to which the present application belongs to understand the present application more clearly, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0028] Please refer to Figure 1 and Figure 2 In the first aspect embodiment of the present application, a feeding device for a waste plastic reactor is provided, including an extruder 1, a baffle 2, a connection channel 3, a blanking valve 4, an oxygen-free silo 5 and a screw feeder 6, wherein:

[0029] The extruder 1 is used to extrude the entering plastic fragments to initially discharge the air in the plastic fragments;

[0030] The baffle 2 is arranged in the extruder 1 and is arranged near the discharge end of the extruder 1;

[0031] The connection channel 3 is connected to the discharge end of the extruder 1;

[0032] The blanking valve 4 is arranged in the connection channel 3. The blanking valve 4, the baffle 2, the connection channel 3 and the extruder 1 enclose a gas replacement chamber 100, and the gas replacement chamber 100 is used to replace the air in the plastic fragments with the introduced inert gas so that the oxygen content of the plastic fragments meets the standard;

[0033] The inlet of the oxygen-free silo 5 is connected to the connection channel 3, and the outlet is connected to the screw feeder 6;

[0034] The screw feeder 6 is used to transport the plastic fragments to the reactor 12.

[0035] The waste plastic reactor feeding device provided by the embodiment of the present application extrudes the incoming plastic fragments through the extruder 1 to initially discharge the air in the plastic fragments; the feeding valve 4, the baffle 2, the connecting channel 3 and the extruder 1 enclose a gas replacement chamber 100, and the gas replacement chamber 100 replaces the air in the plastic fragments through the introduced inert gas to make the oxygen content of the plastic fragments meet the standard, and then is supplied to the reactor 12 through the anaerobic silo 5 and the screw feeder 6, so that the air content entering the reactor 12 along with the plastic fragments is relatively low, avoiding the safety hazard of explosion and improving the safety of the device.

[0036] In some alternative embodiments, the waste plastic reactor feeding device further includes a discharge channel 7 and a cooling jacket 8; the discharge channel 7 is respectively connected to the screw feeder 6 and the reactor 12; the cooling jacket 8 is arranged on the outer wall of the discharge channel 7 for cooling the discharge channel 7. By arranging the cooling jacket 8, it can be ensured that the discharge channel 7 at the feed inlet of the reactor 12 is in a low-temperature state, and the plastic fragments will not melt and coke, so that the feed inlet of the reactor 12 will not be blocked, enabling the device to continuously produce and improving the plastic recycling efficiency of the device.

[0037] In some alternative embodiments, the cooling jacket 8 at least includes an outer jacket, the outer jacket 81 is sleeved on the discharge channel 7, and the outer jacket 81 is cooled by circulating cooling water. By cooling the outer jacket 81 with circulating cooling water, it can be ensured that the discharge channel 7 at the feed inlet of the reactor 12 is in a low-temperature state, and the plastic fragments will not melt and coke, so that the feed inlet of the reactor 12 will not be blocked, enabling the device to continuously produce and improving the plastic recycling efficiency of the device.

[0038] In some alternative embodiments, the cooling jacket 8 further includes an inner jacket 82, the inner jacket 82 is sleeved on the outer wall of the discharge channel 7 near the discharge end and is located in the outer jacket 81, and the inner jacket 82 is cooled by inert gas. The inert gas in the inner jacket 82 can not only cool the feed inlet but also realize the continuous pneumatic conveying of plastic fragments. In addition, it can also ensure that the outer jacket 81 does not scale during water cooling. The inert gas used in the inner jacket 82 can be nitrogen.

[0039] In some alternative embodiments, the waste plastic reactor feeding device further includes a cyclone separator 9, and the cyclone separator 9 is disposed at the discharging end of the discharging channel 7. While conveying plastic fragments to the reactor 12, a gas film is formed on the inner wall of the cyclone separator 9, further preventing the plastic fragments from melting and coking and blocking inside the cyclone separator 9, thereby ensuring the continuity of the feeding of the reactor 12. The working principle of the cyclone separator 9 is as follows: The purified natural gas enters the cyclone separation zone inside the device through the device inlet. When the gas containing impurities enters the cyclone separation tube axially, the airflow generates strong rotation under the guiding action of the guiding vanes. The airflow spirally descends along the cylinder body into the cyclone cylinder. The liquid droplets and dust particles with large density are thrown towards the wall of the device under the action of centrifugal force, and under the action of gravity, they fall along the wall of the cylinder and flow out of the dust discharging port of the cyclone tube to the liquid storage area at the bottom of the device, and then flow out from the liquid discharging port at the bottom of the device; the rotating airflow contracts and flows towards the center inside the cylinder body, forming a secondary vortex flow upwards and flowing through the air duct to the purified natural gas chamber, and then flowing out through the outlet at the top of the device. The secondary vortex flow formed by the cyclone separator 9 can form a gas film on the inner wall of the cyclone separator 9.

[0040] In some alternative embodiments, the waste plastic reactor feeding device further includes a vibrating screen 10, and the vibrating screen 10 is disposed on the connecting channel 3 and is close to the anaerobic silo 5. Through the vibrating action of the vibrating screen 10, the plastic fragments previously extruded by the extruder become fluffy, facilitating their transportation through the screw feeder 6, and when they subsequently enter the reactor 12 for chemical reaction, the reaction can be more complete, improving the recycling efficiency of the plastic.

[0041] In some alternative embodiments, the feeding valve adopts a knife gate valve. The knife gate valve is also called a manual knife gate valve. It is a valve in which the gate plate and the valve seat are always in close contact and sealed. It has the advantages of simple and compact structure, reasonable design, light weight and material saving, reliable sealing, convenient and flexible operation, small volume, smooth channel, small flow resistance, light weight, easy installation, and easy disassembly. Therefore, in this embodiment, the feeding valve preferably adopts a knife gate valve.

[0042] In some alternative embodiments, the cross-sectional area of the connecting channel 3 is larger than the cross-sectional area of the extruder 1. By making the cross-sectional area of the connecting channel 3 larger than the cross-sectional area of the extruder 1, the plastic fragments can enter the connecting channel 3 from the extruder 1 more smoothly, and the connecting channel 3 can completely hold the plastic fragments entering the connecting channel 3 from the extruder 1, improving the reliability and stability of the device.

[0043] In some alternative embodiments, the waste plastic reactor feeding device further includes a storage bin 11, which is connected to the extruder 1 and used to store plastic fragments and supply plastic fragments to the extruder 1. By storing plastic fragments in the storage bin 11, it is ensured that plastic fragments can be continuously supplied to the extruder 1, guaranteeing the continuous progress of the process and improving the recycling efficiency of plastics.

[0044] The working principle of the waste plastic reactor feeding device proposed in the embodiments of the present application is as follows: Plastic fragments are placed in the storage bin 11 and scattered in the extruder 1 under the action of gravity. The extruder 1 is used to extrude the plastic fragments under a pressure of 0.1 - 0.3 MPa to initially discharge the air in the plastic fragments. The baffle 2 is opened, so that the extruded plastic fragments fall into the gas replacement chamber 100. The baffle 2 and the feed valve are closed, and inert gas replacement is carried out in the gas replacement chamber 100. After the oxygen content meets the standard, the plastic fragments enter the anaerobic storage bin 5 through the vibrating screen 10. The fragments entering the anaerobic storage bin 5 are sent into the feed channel through the screw conveyor for plastic fragments with a size of 2 mm - 10 mm, and then sent into the reactor 12; The cooling jacket 8 is arranged on the outer wall of the discharge channel 7 to ensure that the plastic fragments do not melt in the discharge channel 7. The outer jacket 81 is cooled by circulating cooling water, and the inner jacket 82 is cooled by inert gas. While the inert gas in the inner jacket 82 cools the feed port, it can also realize the continuous pneumatic conveying of plastic fragments; While the cyclone separator 9 conveys plastic fragments to the reactor 12, a gas film is formed on the inner wall of the cyclone separator 9 to further prevent the plastic fragments from melting, coking and blocking in the cyclone separator 9, thus ensuring the continuity of the feeding of the reactor 12.

[0045] Please refer to Figure 2 , an embodiment of the second aspect of the present application provides a waste plastic reaction system, including a reactor 12 and the waste plastic reactor feeding device according to the first aspect, and the reactor 12 is connected to the screw feeder 6.

[0046] In the waste plastic reaction system provided by the embodiments of the present application, the entering plastic fragments are extruded by the extruder 1 to initially discharge the air in the plastic fragments; The blanking valve 4, the baffle 2, the connection channel 3 and the extruder 1 enclose a gas replacement chamber 100, and the gas replacement chamber 100 is replaced with the air in the plastic fragments by introducing inert gas, so that the oxygen content of the plastic fragments meets the standard, and then is supplied to the reactor 12 through the anaerobic storage bin 5 and the screw feeder 6, so that the air content entering the reactor 12 with the plastic fragments is relatively low, avoiding the potential safety hazard of explosion and improving the safety of the device.

[0047] In some alternative embodiments, the waste plastic reaction system further includes a blower 13, which is connected to the reactor 12 and used to blow air into the reactor 12 to make the plastic fragments fluffier, improve the reaction efficiency, and thus improve the recycling efficiency of plastics.

[0048] In this application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, or may also include the first and second features not being in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0049] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to this application.

[0050] In this application, unless otherwise clearly specified and defined, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0051] In addition, in this application, descriptions such as "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "a plurality" is two or more, unless otherwise clearly specifically defined.

[0052] Although embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present application. The scope of the present application is defined by the claims and their equivalents.

Claims

1. A feeding device for a waste plastic reactor, characterized in that, It includes an extruder, a baffle plate, a connection channel, a blanking valve, an oxygen-free silo and a screw feeder, where: The extruder is used to extrude the incoming plastic fragments to initially discharge the air in the plastic fragments; The baffle plate is arranged in the extruder and is close to the discharge end of the extruder; The connection channel is connected to the discharge end of the extruder; The blanking valve is arranged in the connection channel. The blanking valve, the baffle plate, the connection channel and the extruder enclose a gas replacement chamber, and the gas replacement chamber is used to replace the air in the plastic fragments by introducing inert gas to make the oxygen content of the plastic fragments meet the standard; The inlet of the oxygen-free silo is connected to the connection channel, and the outlet is connected to the screw feeder; The screw feeder is used to transport the plastic fragments to the reactor.

2. The waste plastic reactor feeding device according to claim 1, characterized in that, It also includes a discharge channel and a cooling jacket; the discharge channel is respectively connected to the screw feeder and the reactor; the cooling jacket is arranged on the outer wall of the discharge channel and is used to cool the discharge channel.

3. The waste plastic reactor feeding device according to claim 2, wherein, The cooling jacket at least includes an outer jacket, the outer jacket is sleeved on the discharge channel, and the outer jacket is cooled by circulating cooling water.

4. The waste plastic reactor feeding device according to claim 3, characterized in that, The cooling jacket also includes an inner jacket, the inner jacket is sleeved on the outer wall of the discharge channel near the discharge end and is located in the outer jacket, and the inner jacket is cooled by inert gas.

5. The waste plastic reactor feeding device according to claim 4, wherein, It also includes a cyclone separator, and the cyclone separator is arranged at the discharge end of the discharge channel.

6. The waste plastic reactor feeding device according to claim 1, wherein It also includes a vibrating screen, and the vibrating screen is arranged on the connection channel and is close to the oxygen-free silo.

7. The waste plastic reactor feeding device according to claim 1, wherein The feed valve adopts a slide gate valve.

8. The waste plastic reactor feeding device according to claim 1, wherein The cross-sectional area of the connection channel is larger than the cross-sectional area of the extruder.

9. The waste plastic reactor feeding device according to any one of claims 1-8, characterized in that, It also includes a storage silo, and the storage silo is connected to the extruder, used to store plastic fragments and supply plastic fragments to the extruder.

10. A waste plastic reaction system, characterized in that, It includes a reactor and a waste plastic reactor feeding device according to any one of claims 1-9, and the reactor is connected to the screw feeder.

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