Block-shaped waste plastic feeding device of gasification furnace

Abstract

The utility model discloses a blocky waste plastic feeding device of a gasification furnace, and relates to the technical field of urban solid waste treatment, the blocky waste plastic feeding device comprises a first spiral feeding device, an air closing valve, a second spiral feeding device and a material dispersing device; the discharging end of the first spiral feeding device is communicated with the feeding end of the second spiral feeding device through an air closing valve; the discharging end of the second spiral feeding device is connected with the feeding end of the gasification furnace; the material dispersing device is installed at the discharging end of the second spiral feeding device and used for forming airflow outside the discharging end of the second spiral feeding device so as to disperse materials output by the discharging end of the second spiral feeding device. By means of the technical scheme, output materials can enter the gasification furnace in a dispersed mode, the gasification production efficiency is improved, the problem of high-temperature coking and blocking of the materials at the discharging end is avoided, quantitative and sustainable output of waste plastic blocks is guaranteed, stable and continuous feeding is guaranteed, and smoke in the gasification furnace is effectively prevented from leaking outwards and escaping.

Description

Technical Field

[0001] The present application relates to the technical field of urban solid waste treatment, and in particular to a block-shaped waste plastic feeding device for a gasification furnace. Background Art

[0002] With the rapid development of urbanization, the treatment of urban solid waste has become an important environmental issue. All sectors of society are very concerned about the harmless treatment of urban solid waste. Among them, positive pressure circulating fluidized bed gasification furnace technology is gradually becoming practical for the treatment of the above solid waste.

[0003] The feeding device is an important device in the positive pressure circulating fluidized bed gasifier equipment. It plays the role of conveying solid waste materials into the gasifier. There are still some problems in actual use, especially for the use of block-shaped waste plastic feeding.

[0004] Existing feeding devices mainly include spiral feeding devices and general hydraulic feeding devices.

[0005] As for the screw feeding device, due to the characteristics of small specific gravity, low density, easy softening when heated, and increased softening adhesion of bulk waste materials, there are still small gaps between the materials of bulk waste plastics stored in the barrel or in the conveying pipe. In normal production, the internal pressure of the positive pressure circulating fluidized bed gasifier is greater than the external pressure, and the gasifier may explode in some cases, the pressure in the furnace will be instantly raised, and the flue gas can easily leak out through the screw feeding device through the material gap. In addition, there is a defect that the screw feeding device is prone to high-temperature coking and clogging of the material at the outlet of the furnace.

[0006] As for the general hydraulic feeding device, its vertical cross cylinder operation is complicated, and the piston pushes the material to feed intermittently, so the material entering is not uniform and continuous. The stability of the feeder directly affects the gasification efficiency of the gasifier, and the leakage of flue gas in the furnace will cause personal health damage to operators and environmental pollution.

[0007] Therefore, how to prevent the flue gas in the gasifier from escaping during feeding, ensure stable and continuous feeding, and avoid coking and blockage has become a technical problem that needs to be solved urgently. Utility Model Content

[0008] In view of this, the purpose of the present application is to provide a waste plastic block feeding device for a gasifier to solve the technical problems of smoke leakage, inability to feed stably and continuously, and coking and blockage during feeding in existing feeding devices.

[0009] In order to achieve the above technical purpose, the present application provides a waste plastic feeding device for a gasification furnace in the form of blocks, comprising a first spiral feeding device, an air shut-off valve, a second spiral feeding device and a material dispersing device;

[0010] The discharge end of the first spiral feeding device is connected to the feed end of the second spiral feeding device through the air shut-off valve;

[0011] The discharge end of the second spiral feeding device is connected to the feed end of the gasifier;

[0012] The material dispersing device is installed on the discharge end of the second screw feeding device, and is used to form an airflow outside the discharge end of the second screw feeding device to disperse the material output from the discharge end of the second screw feeding device.

[0013] Further, it also includes a material barrel;

[0014] The bottom of the barrel is provided with a discharge port;

[0015] The discharge port of the material barrel is connected to the feeding end of the first spiral feeding device.

[0016] Furthermore, it also includes a rotary scraper and a scraper drive motor;

[0017] The rotary scraper is rotatably installed at the bottom of the barrel and is used to scrape the material in the barrel into the first spiral feeding device;

[0018] The scraper driving motor is installed outside the material barrel and connected to the rotary scraper to drive the rotary scraper to rotate.

[0019] Further, the first screw feeding device includes a first conveying pipe, a first screw feeding rod and a first feeding drive motor;

[0020] The first spiral feed rod is pivotally connected to the first conveying pipe;

[0021] The first feeding drive motor is installed outside the first conveying pipe and connected to the first spiral feeding rod to drive the first spiral feeding rod to rotate.

[0022] Further, the second screw feeding device includes a second conveying pipe, a second screw feeding rod and a second feeding drive motor;

[0023] The second screw feed rod is pivotally connected to the second conveying pipe;

[0024] The second feeding drive motor is installed outside the second conveying pipe and connected to the second spiral feeding rod to drive the second spiral feeding rod to rotate.

[0025] Further, the material dispersing device includes an annular ventilation member and a plurality of first nozzles;

[0026] The annular ventilation member is disposed on the discharge end of the second spiral feeding device and is provided with a ventilation cavity therein;

[0027] The annular ventilation member is connected with an air inlet pipe communicating with the ventilation cavity;

[0028] The air inlet pipe is connected to an air supply source;

[0029] One end of a plurality of the first nozzles is connected to the annular ventilation member and is distributed around the circumference of the annular ventilation member;

[0030] The other ends of the plurality of first nozzles extend out of the discharge end of the second spiral feeding device and are bent toward the center line of the discharge end of the second spiral feeding device.

[0031] Furthermore, the material dispersing device also includes a connecting piece;

[0032] The connecting piece is a connecting pipe sleeved on the discharge end of the second spiral feeding device;

[0033] The annular ventilation member is sleeved and fixed on the connecting member.

[0034] Furthermore, the material dispersing device further comprises a plurality of second nozzles;

[0035] One end of a plurality of the second nozzles is connected to the annular ventilation member and is distributed around the circumference of the annular ventilation member;

[0036] The plurality of second nozzles are located below the first nozzle and are arranged along a straight line parallel to the center line of the discharge end of the second spiral feeding device.

[0037] Furthermore, the gases ejected from the first nozzle and the second nozzle are in a cone shape.

[0038] Further, the annular ventilation member includes an annular groove and an annular bottom plate;

[0039] The annular groove is sleeved outside the connecting piece and is sealed and connected to the outer peripheral wall of the connecting piece;

[0040] The annular bottom plate is sleeved outside the connecting member and connected to the outer peripheral wall of the connecting member and the annular groove;

[0041] The ventilation cavity is surrounded by the annular groove, the annular bottom plate and the connecting piece.

[0042] It can be seen from the above technical solutions that the block-shaped waste plastic feeding device for the gasification furnace designed in this application has the following beneficial effects:

[0043] 1. Design a material dispersion device to form an airflow outside the discharge end of the second spiral feeding device, which can not only cool the discharge end, but also disperse the output material into the gasifier, improve the gasification production efficiency, and avoid high-temperature coking and blockage of the material at the discharge end.

[0044] 2. Designed based on the spiral feeding device to ensure the quantitative and sustainable output of waste plastic blocks and ensure stable and continuous feeding.

[0045] 3. The air shut-off valve is set up, which can use its own rotating impeller rotor to transport the material to the second spiral feeding device. Since the impeller rotor of the air shut-off valve has a good sealing performance with the valve body, it can effectively prevent the smoke in the gasifier from leaking out; moreover, the airflow generated by the material dispersion device can also play a certain airtight role, further improving the sealing effect.

[0046] 4. The materials used in this application are mostly standard parts and conventional profiles, and the production cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0048] Figure 1 This is a schematic structural diagram of a block-shaped waste plastic feeding device for a gasification furnace provided in this application;

[0049] Figure 2 A side view of a material dispersing device of a block-shaped waste plastic feeding device of a gasification furnace provided in the present application;

[0050] Figure 3 It is the SS cross-sectional view in the figure;

[0051] In the figure: 1, barrel; 2, rotary scraper; 3, scraper drive motor; 4, first conveying pipe; 5, first spiral feed rod; 6, first feed drive motor; 7, air shut-off valve; 8, second conveying pipe; 9, second spiral feed rod; 10, second feed drive motor; 11, material dispersing device; 12, gasifier;

[0052] 101. First spiral feeding device; 102. Second spiral feeding device; 201. Connecting piece; 202. Air inlet pipe; 203. Annular groove; 204. Annular bottom plate; 205. First nozzle; 206. Second nozzle; 207. Ventilation chamber. DETAILED DESCRIPTION

[0053] The technical solutions of the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all of them. All other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments in the embodiments of the present application are within the scope of protection of the embodiments of the present application.

[0054] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do 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 limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0055] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a replaceable connection, or an integral connection, it can be a mechanical connection, it can be an electrical connection, it can be a direct connection, it can be indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0056] The embodiment of the present application discloses a block-shaped waste plastic feeding device for a gasification furnace.

[0057] See also Figure 1 An embodiment of a gasification furnace block-shaped waste plastic feeding device provided in the embodiments of the present application includes:

[0058] The first screw feeding device 101 , the air shut-off valve 7 , the second screw feeding device 102 and the material dispersing device 11 .

[0059] The discharge end of the first spiral feeding device 101 is connected to the feed end of the second spiral feeding device 102 through the air shut-off valve 7; the first spiral feeding device 101 is arranged above the second spiral feeding device 102, and the air shut-off valve 7 drives the material to rotate by rotating the impeller rotor, rotating from the upper part to the lower part to drop the material.

[0060] The discharge end of the second spiral feeding device 102 is connected to the feed end of the gasifier 12;

[0061] The material dispersing device 11 is installed on the discharge end of the second screw feeding device 102 and is used to form an airflow outside the discharge end of the second screw feeding device 102 to disperse the material output from the discharge end of the second screw feeding device 102 .

[0062] The block-shaped waste plastic feeding device for the gasification furnace designed in this application has the following beneficial effects:

[0063] 1. Design a material dispersion device 11 to form an airflow outside the discharge end of the second spiral feeding device 102, which can not only cool the discharge end, but also disperse the output material into the gasifier 12, thereby improving the gasification production efficiency and avoiding the problem of high-temperature coking and blockage of the material at the discharge end.

[0064] 2. Designed based on the spiral feeding device to ensure the quantitative and sustainable output of waste plastic blocks and ensure stable and continuous feeding.

[0065] 3. The air shut-off valve 7 is set to use its own rotating impeller rotor to transport the material to the second spiral feeding device 102. Since the impeller rotor of the air shut-off valve 7 has a good sealing fit with the valve body, it can effectively prevent the smoke in the gasification furnace 12 from leaking out; moreover, the airflow generated by the material dispersion device 11 can also play a certain airtight role, further improving the sealing effect.

[0066] 4. The materials used in this application are mostly standard parts and conventional profiles, and the production cost is low.

[0067] The above is the first embodiment of a feeding device for a waste plastic block of a gasifier provided by the embodiment of the present application. The following is the second embodiment of a feeding device for a waste plastic block of a gasifier provided by the embodiment of the present application. For details, please refer to Figures 1 to 3 .

[0068] Based on the solution of the above embodiment 1:

[0069] Furthermore, if Figure 1 As shown, it also includes a barrel 1, a discharge port is provided at the bottom of the barrel 1, the discharge port of the barrel 1 is connected to the feeding end of the first spiral feeding device 101, and the barrel 1 is a receiving and buffering hopper for block-shaped waste plastics.

[0070] Furthermore, if Figure 1 As shown, it also includes a rotary scraper 2 and a scraper drive motor 3.

[0071] The rotary scraper 2 is rotatably installed at the bottom position of the barrel 1, and is used to scrape the material in the barrel 1 into the first spiral feeding device 101; the scraper drive motor 3 is installed outside the barrel 1 and connected to the rotary scraper 2, and is used to drive the rotary scraper 2 to rotate, so as to push the material in the barrel 1 into the spiral feeding device.

[0072] A discharge port is provided at the right side of the bottom of the barrel 11 , and the waste plastic is driven by the rotary scraper 2 of the barrel 1 into the first screw feeding device 101 , and then the material is continuously discharged through the second screw feeding device 102 .

[0073] Furthermore, if Figure 1 As shown, for the design of the first screw feeding device 101, it is an existing screw conveying mechanism for conveying waste plastics, specifically including a first conveying pipe 4, a first screw feeding rod 5 and a first feeding drive motor 6; the first screw feeding rod 5 is pivotally connected to the first conveying pipe 4; the first feeding drive motor 6 is installed outside the first conveying pipe 4 and connected to the first screw feeding rod 5, and is used to drive the first screw feeding rod 5 to rotate. The first screw feeding rod 5 includes a shaft and a spiral blade arranged on the shaft, a feed port is provided at the upper left portion of the first conveying pipe 4 to form a feed end, a discharge port is provided at the lower right portion of the first conveying pipe 4 to form a discharge end, the discharge port of the first conveying pipe 4 is connected to the upper end of the air shut-off valve 7, and the lower end of the air shut-off valve 7 is connected to the feed end of the second screw feeding device 102.

[0074] Furthermore, if Figure 1 As shown, for the design of the second screw feeding device 102, it is an existing screw conveying mechanism for conveying waste plastics, specifically including a second conveying pipe 8, a second screw feeding rod 9 and a second feeding drive motor 10; the second screw feeding rod 9 is pivotally connected to the second conveying pipe 8; the second feeding drive motor 10 is installed outside the second conveying pipe 8 and connected to the second screw feeding rod 9, and is used to drive the second screw feeding rod 9 to rotate. The second screw feeding rod 9 includes a shaft and a spiral blade arranged on the shaft, a feed port is provided on the upper left side of the second conveying pipe 8 to form a feed end, a discharge port is provided on the right side of the second conveying pipe 8 to form a discharge end, the feed port of the second conveying pipe 8 is connected to the lower end of the air shut-off valve 7, and the second conveying pipe 8 is flange-connected to the material dispersing device 11.

[0075] Furthermore, if Figure 2 as well as Figure 3 As shown, the material dispersing device 11 is designed to include an annular ventilation member and a plurality of first nozzles 205 .

[0076] The annular ventilation member is arranged on the discharge end of the second spiral feeding device 102, and is provided with a ventilation cavity 207 therein; the annular ventilation member is connected to an air inlet pipe 202 connected to the ventilation cavity 207; the air inlet pipe 202 is connected to an air supply source; one end of a plurality of the first nozzles 205 is connected to the annular ventilation member, and are distributed around the circumference of the annular ventilation member; the other ends of the plurality of the first nozzles 205 extend out of the discharge end of the second spiral feeding device 102, and are bent toward the center line of the discharge end of the second spiral feeding device 102.

[0077] It can be understood that the first nozzle 205 is an elbow nozzle, one end of which is directly connected to the ventilation chamber 207, and the other end is bent toward the center line of the discharge end of the second spiral feeding device 102. The number of the first nozzle 205 can be, for example, 9, without specific limitation.

[0078] Furthermore, in order to facilitate connection and fixation, the material dispersing device 11 also includes a connecting piece 201 as a main structure.

[0079] The connecting piece 201 is a connecting pipe structure that is sleeved on the discharge end of the second spiral feeding device 102 . A flange is provided on the left side of the connecting piece 201 to facilitate flange connection with the second conveying pipe 8 . The annular ventilation piece is sleeved on the connecting piece 201 .

[0080] Furthermore, the material dispersing device 11 also includes a plurality of second nozzles 206 .

[0081] One end of multiple second nozzles 206 is connected to the annular ventilation member and is distributed around the circumference of the annular ventilation member; multiple second nozzles 206 are located below the first nozzle 205 and are arranged along a straight line parallel to the center line of the discharge end of the second spiral feeding device 102.

[0082] It can be understood that the second nozzle 206 is a straight nozzle, which, when combined with an elbow nozzle, can further accelerate the dispersion of materials into the gasifier 12 at the discharge end of the second spiral feeding device 102, further improve the gasification production efficiency, and better avoid high-temperature coking and blockage of materials at the discharge end; the number of second nozzles 206 can be three, without specific limitation.

[0083] Furthermore, the gas ejected from the first nozzle 205 and the second nozzle 206 is cone-shaped and can fully cover the discharge end of the second screw feeding device 102 to better achieve an airtight effect and prevent the flue gas in the gasification furnace 12 from entering the second screw feeding device 102 and flowing back out.

[0084] Furthermore, the annular ventilation member is designed to include an annular groove 203 and an annular bottom plate 204 .

[0085] The annular groove 203 is sleeved outside the connecting piece 201 and is sealedly connected to the outer peripheral wall of the connecting piece 201; the annular bottom plate 204 is sleeved outside the connecting piece 201 and is connected to the outer peripheral wall of the connecting piece 201 and the annular groove 203; the annular groove 203, the annular bottom plate 204 and the connecting piece 201 form the ventilation cavity 207.

[0086] Specifically, the annular groove 203 is arranged in a semi-elliptical shape, and the right end of the connecting piece 201 passes through the annular groove 203 and the annular bottom plate 204, and then is welded to the annular groove 203 and the annular bottom plate 204 to form a sealed and annular ventilation chamber 207. An air inlet pipe 202 is provided at the bottom of the annular groove 203, and the air inlet pipe 202 is connected to, for example, a high-pressure blower; and one end of the first nozzle 205 and the second nozzle 206 can be connected to the annular bottom plate 204.

[0087] The working principle of the block-shaped waste plastic feeding device of the gasifier designed in this application is as follows:

[0088] 1. The scraper driving motor 3 drives the rotary scraper 2 to rotate, pushing the material in the barrel 1 into the first spiral feeding device 101; the material is transported to the top of the air shut-off valve 7 through the first spiral feeding device 101; since the impeller rotor of the air shut-off valve 7 is driven by the motor to rotate continuously; the material is driven by the impeller rotor to rotate from the top to the bottom and enter the second spiral feeding device 102; among them, because the impeller rotor inside the air shut-off valve 7 has a good sealing fit with the valve body, it can effectively prevent the smoke in the gasification furnace 12 from leaking out.

[0089] 2. The material in the second conveying pipe 8 is pushed by the second spiral feeding rod 9 and output from the discharging end at the right end; the air inlet pipe 202 is connected to the high-pressure blower, and under the action of the high-pressure blower, the cold air passes through the air inlet pipe 202 and enters the annular ventilation chamber 207; wherein the ventilation chamber 207 is semi-elliptical, the air inlet pipe 202 is arranged at the bottom, and the chamber space of the ventilation chamber 207 located below the connecting piece 201 is designed to be larger than the chamber space located above the connecting piece 201, so that the incoming cold air will quickly fill the ventilation chamber 207, and then pass through the first nozzle 205 and the second nozzle 206. The two nozzles 206 spray evenly; the gas sprayed by the first nozzle 205 and the second nozzle 206 are both in a cone state, so that the discharge end of the second conveying pipe 8 can be fully covered; the temperature at the discharge end of the second conveying pipe 8 is kept at a relatively low state, and the material is not easily blocked by high-temperature coking; at the same time, the material dispersion is accelerated under the action of the cold air gas spray, and the material enters the gasifier 12 more smoothly for gasification; furthermore, the sprayed gas also helps to provide an airtight seal at the discharge end of the second conveying pipe 8, preventing the flue gas in the gasifier 12 from entering the second conveying pipe 8. The above design, under the dual protection of the air shut-off valve 7 and the airtight seal, ensures that the harmful flue gas in the gasifier 12 will not leak to the outside; the second spiral feeding device 102 can also continuously and efficiently transport the material to the gasifier 12 for gasification production.

[0090] The above is a detailed introduction to a gasification furnace block-shaped waste plastic feeding device provided in the present application. For a general technician in this field, according to the ideas of the embodiments of the present application, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A feeding device for waste plastics in block form for a gasification furnace, characterized in that: It comprises a first screw feeding device (101), an air shut-off valve (7), a second screw feeding device (102) and a material dispersing device (11); The discharge end of the first spiral feeding device (101) is connected to the feed end of the second spiral feeding device (102) via the air shut-off valve (7); The discharge end of the second spiral feeding device (102) is connected to the feed end of the gasifier (12); The material dispersion device (11) is installed on the discharge end of the second screw feeding device (102) and is used to form an airflow outside the discharge end of the second screw feeding device (102) to disperse the material output from the discharge end of the second screw feeding device (102).

2. The device for feeding block-shaped waste plastics into a gasification furnace according to claim 1, characterized in that: Also includes a material barrel (1); The bottom of the barrel (1) is provided with a discharge port; The discharge port of the material barrel (1) is connected to the feeding end of the first spiral feeding device (101).

3. A feeding device for lump-shaped waste plastics for a gasification furnace according to claim 2, characterized in that: It also includes a rotary scraper (2) and a scraper drive motor (3); The rotary scraper (2) is rotatably mounted at the bottom of the barrel (1) and is used to scrape the material in the barrel (1) into the first spiral feeding device (101); The scraper drive motor (3) is installed outside the material barrel (1) and is connected to the rotary scraper (2) to drive the rotary scraper (2) to rotate.

4. The device for feeding block-shaped waste plastics into a gasification furnace according to claim 1, characterized in that: The first screw feeding device (101) comprises a first conveying pipe (4), a first screw feeding rod (5) and a first feeding drive motor (6); The first spiral feeding rod (5) is pivotally connected to the first conveying pipe (4); The first feeding drive motor (6) is installed outside the first conveying pipe (4) and is connected to the first screw feeding rod (5) for driving the first screw feeding rod (5) to rotate.

5. The device for feeding block-shaped waste plastics into a gasification furnace according to claim 1, characterized in that: The second screw feeding device (102) comprises a second conveying pipe (8), a second screw feeding rod (9) and a second feeding drive motor (10); The second spiral feeding rod (9) is pivotally connected to the second conveying pipe (8); The second feeding drive motor (10) is installed outside the second conveying pipe (8) and is connected to the second screw feeding rod (9) to drive the second screw feeding rod (9) to rotate.

6. The device for feeding block-shaped waste plastics into a gasification furnace according to claim 1, characterized in that: The material dispersing device (11) comprises an annular ventilation member and a plurality of first nozzles (205); The annular ventilation member is disposed on the discharge end of the second spiral feeding device (102) and is provided with a ventilation cavity (207) therein; The annular ventilation member is connected to an air inlet pipe (202) communicating with the ventilation cavity (207); The air inlet pipe (202) is connected to an air supply source; One end of a plurality of the first nozzles (205) is connected to the annular ventilation member and is distributed around the circumference of the annular ventilation member; The other ends of the plurality of first nozzles (205) extend out of the discharge end of the second spiral feeding device (102) and are bent toward the center line of the discharge end of the second spiral feeding device (102).

7. A feeding device for lump-shaped waste plastics for a gasification furnace according to claim 6, characterized in that: The material dispersing device (11) further comprises a connecting piece (201); The connecting piece (201) is a connecting pipe sleeved on the discharge end of the second spiral feeding device (102); The annular ventilation piece is sleeved and fixed on the connecting piece (201).

8. The device for feeding block-shaped waste plastics into a gasification furnace according to claim 7, characterized in that: The material dispersing device (11) further includes a plurality of second nozzles (206); One end of a plurality of the second nozzles (206) is connected to the annular ventilation member and is distributed around the circumference of the annular ventilation member; The plurality of second nozzles (206) are located below the first nozzle (205) and are arranged along a straight line parallel to the center line of the discharge end of the second spiral feeding device (102).

9. A feeding device for lump-shaped waste plastics for a gasification furnace according to claim 8, characterized in that: The gas ejected from the first nozzle (205) and the second nozzle (206) is in a cone shape.

10. The device for feeding block-shaped waste plastics into a gasification furnace according to claim 8, characterized in that: The annular ventilation member comprises an annular groove (203) and an annular bottom plate (204); The annular groove (203) is sleeved outside the connecting piece (201) and is sealingly connected to the outer peripheral wall of the connecting piece (201); The annular bottom plate (204) is sleeved outside the connecting member (201) and is connected to the outer peripheral wall of the connecting member (201) and the annular groove (203); The annular groove (203), the annular bottom plate (204) and the connecting piece (201) form the ventilation cavity (207).

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