Circulating hot blast stove based on waste plastic thermal cracking processing

Abstract

The utility model relates to the field of waste plastic thermal cracking, in particular to a circulating hot blast stove based on waste plastic thermal cracking processing, which comprises a combustion tube, a mounting cover is fixedly arranged on one side of the combustion tube through bolts, and a compressed air ejection head, a combustible gas nozzle and a combustible liquid nozzle which are axially distributed are arranged in the mounting cover. A mixing and filtering tower is further arranged on one side of the combustion pipe; when too much dust is accumulated on the filter plates, the opening and closing plate is pushed upwards through the push block, then a new filter plate is pushed into the filter plate mounting frame, the middle filter plate is pushed to the open groove, the air pump is connected to one end of the connecting pipe, the air pump is opened, the high-pressure air injection box begins to discharge air, and the dust is discharged through the high-pressure air injection box. And dust and impurities blocking one side of the filter plate are flushed out, so that the filter plate is cleaned, then the dust is discharged through the waste residue discharging hole, the filter plate in the device is convenient to replace, the impurities on the filter plate can be preliminarily cleaned, and therefore the practicability of the device is improved.

Description

Technical Field

[0001] The utility model relates to the field of thermal cracking of waste plastics, in particular to a circulating hot air furnace based on thermal cracking processing of waste plastics. Background Art

[0002] Many existing devices use gas or diesel as the heat source of the hot air furnace. Especially in the field of waste pyrolysis, the hot air generated by the combustion of gas or diesel is often used as the heat source for pyrolysis. The existing hot air is generally obtained by burning combustibles, where the combustibles can be either fuel oil or gas.

[0003] Most of the existing hot blast furnaces can only use a single fuel as a combustion material, and after the waste plastics are cracked, the remaining high-temperature flue gas will be directly cooled and discharged, causing waste. It is difficult to reheat and reuse the remaining high-temperature flue gas after the waste plastics are cracked. In addition, there is usually no filter plate in the existing hot blast furnace, and the filter plate in some hot blast furnaces with filter plates is not convenient to replace.

[0004] In view of the above technical defects, a solution is now proposed. Utility Model Content

[0005] The purpose of the utility model is to provide a circulating hot air furnace based on the thermal cracking processing of waste plastics to solve the above-mentioned technical defects.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A circulating hot air furnace based on thermal cracking of waste plastics comprises a combustion tube, one side of which is fixed with a mounting cover by bolts, wherein the mounting cover is provided with an axially distributed compressed air nozzle, a combustible gas nozzle and a combustible liquid nozzle;

[0008] A mixing and filtering tower is also provided on one side of the combustion tube, and the mixing and filtering tower includes a mixing tower, a circular partition plate is fixedly provided inside the mixing tower, a filter plate mounting frame is fixedly provided inside the mixing tower, three filter plates distributed in an array are placed inside the filter plate mounting frame, a mounting frame is also provided above the circular partition plate, and a rotatably connected mixing fan is provided above the mounting frame.

[0009] Preferably, the compressed air spray head, the combustible gas spray head and the combustible liquid spray head are all fixedly connected to the mounting cover, one end of the compressed air spray head, the combustible gas spray head and the combustible liquid spray head all pass through the mounting cover and extend into the combustion tube, and a first air inlet pipe is also fixedly provided on one side of the combustion tube;

[0010] The first air inlet pipe is communicated with the interior of the combustion tube, an igniter is fixedly arranged on the other side of the combustion tube, one end of the igniter extends into the combustion tube, and a partition plate is also fixedly arranged inside the combustion tube.

[0011] Preferably, a second air inlet pipe is fixedly provided inside the mixing tower, the second air inlet pipe is fixedly connected to the combustion pipe and is internally communicated, the partition plate extends into the second air inlet pipe, and the bottom of the mixing tower is provided with axially distributed support legs, and the support legs are fixed to the mixing tower by bolts;

[0012] The bottom of the mixing tower is designed to be in an inverted cone shape, a waste residue discharge hole is provided at the center of the bottom of the mixing tower, and an opening is also provided at the bottom of the mixing tower.

[0013] Preferably, a fixedly connected air supply pipe is provided at the bottom of the circular partition, the air supply pipe is connected to the interior of the second air inlet pipe, and the air supply pipe is connected to the interior of the cavity above the circular partition. Slide grooves are also provided on both sides of the mixing tower, and sliding opening and closing plates are provided inside the slide grooves. Push blocks are fixedly provided on the outer sides of the upper ends of the opening and closing plates, and the filter plate mounting frame is located between the second air inlet pipe and the air supply pipe.

[0014] Preferably, an array of ventilation slots is provided at the center of the filter plate mounting frame, a slot is also provided on one side of the filter plate mounting frame, a high-pressure jet box is fixedly provided on the other side of the filter plate mounting frame, a connecting pipe is fixedly provided on one side of the high-pressure jet box, the high-pressure jet box is connected to the inside of the connecting pipe, and one end of the connecting pipe passes through the opening.

[0015] Preferably, a tower cover is fixedly provided on the top of the mixing tower by bolts, a hot air outlet is provided on the top of the tower cover, the mounting frame is fixedly connected to the inner wall of the mixing tower, and the mixing fan is designed as a worm wheel blade.

[0016] The beneficial effects of the utility model are as follows:

[0017] 1. The utility model connects the compressed air nozzle, the combustible gas nozzle and the combustible liquid nozzle respectively, then the compressed air nozzle starts to take in air, and the combustible gas nozzle or the combustible liquid nozzle sprays liquid or gaseous fuel, so that the fuel of the device is more selective. At this time, the igniter is started to ignite the fuel sprayed from the combustible gas nozzle or the combustible liquid nozzle to heat the air sprayed from the compressed air nozzle, and at the same time, the first air intake pipe is connected to the exhaust pipe of the high-temperature exhaust gas discharged from the cracking furnace, and then the high-temperature exhaust gas in the cracking furnace and the air heated by combustion in the combustion pipe are synchronously transported to the second air intake pipe until the air passes through the middle filter plate for filtering, and then the two high-temperature flue gases are discharged into the top of the circular partition through the air delivery pipe, and then the mixing fan is blown to rotate. When the mixing fan rotates, the two flue gases with different temperatures are mixed, so that the two flue gases in the device are more thoroughly fused;

[0018] 2. When there is too much dust on the filter plate in the utility model, the opening and closing plate is pushed upward by the push block, and then the new filter plate is pushed into the filter plate mounting frame. At this time, the middle filter plate is pushed to the slot, and an air pump is connected to one end of the connecting pipe. When the air pump is turned on, air starts to be discharged from the high-pressure jet box, thereby flushing out the dust and impurities blocking one side of the filter plate to clean the filter plate. The dust is then discharged through the waste residue discharge hole, making the replacement of the filter plate in the device more convenient, and the device can also preliminarily clean the impurities on the filter plate, thereby improving the practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in conjunction with the accompanying drawings;

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 It is a schematic cross-sectional view of the combustion tube in the utility model;

[0022] Figure 3 It is a cross-sectional structural schematic diagram of the mixing tower in the utility model;

[0023] Figure 4 It is a schematic cross-sectional structure diagram of the mixing tower in the utility model from another perspective;

[0024] Figure 5 This is a schematic diagram of the connection structure between the filter plate mounting frame and the high-pressure jet box of the utility model;

[0025] Figure 6 It is a structural schematic diagram of the positional relationship between the mounting frame and the tower cover in the utility model.

[0026] Legend: 1. Combustion tube; 11. Mounting cover; 12. Compressed air nozzle; 13. Combustible gas nozzle; 14. Combustible liquid nozzle; 15. First air inlet pipe; 16. Partition plate; 17. Ignitor; 2. Mixing filter tower; 21. Mixing tower; 22. Second air inlet pipe; 23. Air pipe; 24. Circular partition; 25. Opening; 26. Support leg; 27. Waste slag discharge hole; 28. Filter plate mounting frame; 281. Slot; 29. ​​Ventilation slot; 30. Filter plate; 31. Slide; 32. Opening and closing plate; 33. Push block; 34. High-pressure jet box; 35. Connecting pipe; 36. Tower cover; 37. Mounting frame; 38. Mixing fan. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] See also Figure 1 - Figure 6 As shown, the utility model is a circulating hot air furnace based on thermal cracking processing of waste plastics, including a combustion tube 1, one side of the combustion tube 1 is fixed with a mounting cover 11 by bolts, and the mounting cover 11 is provided with an axially distributed compressed air nozzle 12, a combustible gas nozzle 13 and a combustible liquid nozzle 14, the compressed air nozzle 12, the combustible gas nozzle 13 and the combustible liquid nozzle 14 are all fixedly connected to the mounting cover 11, and one end of the compressed air nozzle 12, the combustible gas nozzle 13 and the combustible liquid nozzle 14 passes through the mounting cover 11 and then extends into the combustion tube 1.

[0029] A first air intake pipe 15 is fixedly provided on one side of the combustion tube 1, and the first air intake pipe 15 is connected to the inside of the combustion tube 1. An igniter 17 is fixedly provided on the other side of the combustion tube 1, and one end of the igniter 17 extends into the combustion tube 1. A partition plate 16 is also fixedly provided inside the combustion tube 1, and the partition plate 16 is used to separate the intake air at the first air intake pipe 15 from the high-temperature flue gas obtained by combustion in the combustion tube 1.

[0030] A mixing and filtering tower 2 is also provided on one side of the combustion tube 1. The mixing and filtering tower 2 includes a mixing tower 21. A second air inlet pipe 22 is fixedly provided inside the mixing tower 21. The second air inlet pipe 22 is fixedly connected to the combustion tube 1 and is internally communicated. The partition plate 16 extends into the second air inlet pipe 22. Axially distributed support legs 26 are provided at the bottom of the mixing tower 21. The support legs 26 are fixed to the mixing tower 21 by bolts. The support legs 26 are used to support the mixing tower 21. The bottom of the mixing tower 21 is designed in an inverted cone shape. A waste slag discharge hole 27 is opened at the center of the bottom of the mixing tower 21. The bottom of the mixing tower 21 is also opened with an opening 25.

[0031] A fixedly connected circular partition 24 is provided inside the mixing tower 21, and a fixedly connected gas pipe 23 is provided at the bottom of the circular partition 24. The gas pipe 23 is connected to the inside of the second air inlet pipe 22, and the gas pipe 23 is connected to the inside of the cavity above the circular partition 24. Slide grooves 31 are also provided on both sides of the mixing tower 21, and slidingly connected opening and closing plates 32 are provided inside the slide grooves 31. Push blocks 33 are fixedly provided on the outer sides of the upper ends of the opening and closing plates 32. The push blocks 33 are used to lift the opening and closing plates 32. A filter plate mounting frame 28 is also fixedly provided inside the mixing tower 21, and three filter plates 30 distributed in an array are placed inside the filter plate mounting frame 28. The filter plate mounting frame 28 is located between the second air inlet pipe 22 and the gas pipe 23.

[0032] An array of ventilation slots 29 are provided at the center of the filter plate mounting frame 28, and the ventilation slots 29 are used to connect the second air inlet pipe 22 and the air delivery pipe 23. A slot 281 is also provided on one side of the filter plate mounting frame 28. A high-pressure jet box 34 is fixedly provided on the other side of the filter plate mounting frame 28, and a connecting pipe 35 is fixedly provided on one side of the high-pressure jet box 34. The high-pressure jet box 34 is connected to the inside of the connecting pipe 35, and one end of the connecting pipe 35 passes through the opening 25.

[0033] A tower cover 36 is fixedly provided on the top of the mixing tower 21 by bolts, and a hot air outlet is provided on the top of the tower cover 36. A mounting frame 37 is provided on the top of the circular partition 24, and the mounting frame 37 is fixedly connected to the inner wall of the mixing tower 21. A rotatably connected mixing fan 38 is provided on the top of the mounting frame 37. The mixing fan 38 is designed as a worm gear blade. When wind passes through the mixing fan 38, the mixing fan 38 rotates, thereby mixing hot air of different temperatures, thereby quickly assimilating the temperatures of the two hot airs.

[0034] The working process and principle of the utility model are as follows:

[0035] When in use, firstly connect the compressed air nozzle 12, the combustible gas nozzle 13 and the combustible liquid nozzle 14 respectively, then the compressed air nozzle 12 starts to take in air, and the combustible gas nozzle 13 or the combustible liquid nozzle 14 sprays liquid or gaseous fuel, then start the igniter 17, the igniter 17 ignites the fuel sprayed from the combustible gas nozzle 13 or the combustible liquid nozzle 14 to heat the air sprayed from the compressed air nozzle 12, and at the same time connects the first air inlet pipe 15 to the exhaust pipe of the high-temperature exhaust gas discharged from the cracking furnace, then the high-temperature exhaust gas in the cracking furnace and the air heated by combustion in the combustion tube 1 are synchronously transported to the second air inlet pipe 22 until the air is filtered through the middle filter plate 30, and then the two high-temperature flue gases are discharged into the upper part of the circular partition 24 through the air delivery pipe 23, and then the mixing fan 38 is blown to rotate, and the mixing fan 38 rotates to mix the two flue gases of different temperatures;

[0036] When the middle filter plate 30 accumulates too much dust, the opening and closing plate 32 is pushed upward by the push block 33, and then the new filter plate 30 is pushed into the filter plate mounting frame 28. At this time, the middle filter plate 30 is pushed to the slot 281. At this time, an air pump is connected to one end of the connecting pipe 35, and the air pump is turned on. At this time, the high-pressure jet box 34 starts to discharge air, thereby flushing out the dust and impurities blocking one side of the filter plate 30, thereby cleaning the filter plate 30, and the dust is then discharged through the waste residue discharge hole 27.

[0037] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0038] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is only limited by the claims and their full scope and equivalents.

Claims

1. A circulating hot air furnace based on thermal cracking of waste plastics, comprising a combustion tube (1), characterized in that: A mounting cover (11) is fixedly provided on one side of the combustion tube (1) by means of bolts, wherein the mounting cover (11) is provided with an axially distributed compressed air spray head (12), a combustible gas spray head (13) and a combustible liquid spray head (14); A mixing and filtering tower (2) is also provided on one side of the combustion tube (1), and the mixing and filtering tower (2) comprises a mixing tower (21), a circular partition (24) being fixedly provided inside the mixing tower (21), a filter plate mounting frame (28) being fixedly provided inside the mixing tower (21), three filter plates (30) being arranged in an array inside the filter plate mounting frame (28), a mounting frame (37) being provided above the circular partition (24), and a rotatably connected mixing fan (38) being provided above the mounting frame (37).

2. The circulating hot air furnace based on thermal cracking of waste plastics according to claim 1, characterized in that: The compressed air spray head (12), the combustible gas spray head (13) and the combustible liquid spray head (14) are all fixedly connected to the mounting cover (11); one end of the compressed air spray head (12), the combustible gas spray head (13) and the combustible liquid spray head (14) passes through the mounting cover (11) and then extends into the combustion tube (1); a first air inlet pipe (15) is also fixedly provided on one side of the combustion tube (1); The first air inlet pipe (15) is in communication with the interior of the combustion tube (1); an igniter (17) is fixedly provided on the other side of the combustion tube (1); one end of the igniter (17) extends into the combustion tube (1); and a partition plate (16) is also fixedly provided inside the combustion tube (1).

3. The circulating hot air furnace based on thermal cracking of waste plastics according to claim 2, characterized in that: A second air intake pipe (22) is fixedly provided inside the mixing tower (21), the second air intake pipe (22) is fixedly connected to the combustion tube (1) and is internally communicated, the partition plate (16) extends into the second air intake pipe (22), and axially distributed support legs (26) are provided at the bottom of the mixing tower (21), and the support legs (26) are fixed to the mixing tower (21) by bolts; The bottom of the mixing tower (21) is designed to be inverted cone shape, a waste slag discharge hole (27) is provided at the center of the bottom of the mixing tower (21), and an opening (25) is also provided at the bottom of the mixing tower (21).

4. The circulating hot air furnace based on thermal cracking of waste plastics according to claim 1, characterized in that: A fixedly connected gas supply pipe (23) is provided at the bottom of the circular partition (24), the gas supply pipe (23) is communicated with the interior of the second air inlet pipe (22), and the gas supply pipe (23) is communicated with the interior of the cavity above the circular partition (24). Slide grooves (31) are also provided on both sides of the mixing tower (21), and slidingly connected opening and closing plates (32) are provided inside the slide grooves (31). Push blocks (33) are fixedly provided on the outer sides of the upper ends of the opening and closing plates (32). The filter plate mounting frame (28) is located between the second air inlet pipe (22) and the gas supply pipe (23).

5. The circulating hot air furnace based on thermal cracking of waste plastics according to claim 1, characterized in that: The center of the filter plate mounting frame (28) is provided with ventilation slots (29) distributed in an array, one side of the filter plate mounting frame (28) is also provided with a slot (281), a high-pressure jet box (34) is fixedly provided on the other side of the filter plate mounting frame (28), a connecting pipe (35) is fixedly provided on one side of the high-pressure jet box (34), the high-pressure jet box (34) is connected to the inside of the connecting pipe (35), and one end of the connecting pipe (35) passes through the opening (25).

6. The circulating hot air furnace based on thermal cracking of waste plastics according to claim 1, characterized in that: A tower cover (36) is fixedly provided on the top of the mixing tower (21) by means of bolts, a hot air outlet is provided at the top of the tower cover (36), the mounting frame (37) is fixedly connected to the inner wall of the mixing tower (21), and the mixing fan (38) is designed as a worm wheel blade.

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