Airflow drying tower for light and heavy separation of mixed waste plastics

Abstract

The invention discloses an airflow drying tower for light and heavy separation of mixed waste plastics, and relates to the technical field of plastic separating and drying devices.The airflow drying tower comprises an airflow drying tower shell, a feeding pipe, a second air blower and a combustion chamber, hot air is fed into the airflow drying tower shell through an air inlet pipe, and the hot air circulates upwards in the airflow drying tower shell; the air flow directly acts on the mixed waste plastics discharged from the feeding pipe to evaporate water on the mixed waste plastics, so that light plastics are separated from other heavy impurities, and meanwhile, the light plastics continue to flow upwards along with the air flow and are discharged through the discharging pipe. And the separated heavy impurities fall downwards under the action of gravity and are accumulated at the bottom in the airflow drying tower shell, so that the integrated operation of waste plastic drying and light and heavy separation is realized, the treatment flow is simplified, the treatment efficiency is greatly improved, and the time cost and the equipment investment cost are reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of plastic separation and drying devices, and in particular relates to an airflow drying tower for separating light and heavy mixed waste plastics. Background Art

[0002] Against the backdrop of growing environmental awareness and increasing demand for resource recycling, the recycling of waste plastics has become increasingly important. Recycling waste plastics not only reduces environmental pollution, but also effectively saves resources and reduces dependence on virgin materials. The treatment of mixed waste plastics is a complex process, in which drying and light and heavy separation are key links. Excessive moisture content will affect the subsequent processing results. For example, in the process of mixing waste plastics as raw materials for deep catalytic cracking technology, moisture will cause unstable operation of subsequent raw material processing equipment and reduce product quality. The mixing of light and heavy plastics that have not been effectively separated will limit their reuse value and increase processing difficulty and cost.

[0003] In the current waste plastics processing sector, the mainstream dehydration equipment is primarily squeezers and dehydrators. These machines not only consume high energy and have low production capacity, but also fail to meet the complex compositional requirements of waste plastics. Because waste plastics contain water, and plastics of varying qualities are mixed with impurities such as wood and metal, these machines cannot effectively separate the light and heavy components of the material. This frequently leads to equipment failures, severely impacting production continuity and significantly increasing equipment downtime for maintenance. Summary of the Invention

[0004] (1) Technical problems solved

[0005] The purpose of the present invention is to provide an airflow drying tower for separating light and heavy mixed waste plastics. By setting up an airflow drying tower with separation and drying function, the problems of the existing waste plastic drying equipment lacking impurity separation function and low drying efficiency are solved.

[0006] (2) Technical solution

[0007] To solve the above technical problems, the present invention is achieved through the following technical solutions:

[0008] An airflow drying tower for separating light and heavy mixed waste plastics comprises an airflow drying tower shell, characterized in that a high-speed zone, a low-speed zone and a windless zone are sequentially arranged in the upper and lower inner cavities of the airflow drying tower shell;

[0009] The upper and lower sides of the airflow drying tower shell are fixedly connected with a feed pipe and an air inlet pipe in sequence, the feed pipe is connected to the high-speed zone, the end of the feed pipe away from the airflow drying tower shell is fixedly connected to the storage bin, the air inlet pipe is connected to the low-speed zone, the end of the air inlet pipe away from the airflow drying tower shell is fixedly connected to a second blower, and the air inlet of the second blower is connected to the combustion chamber.

[0010] Preferably, one port of the storage bin is connected to a first blower.

[0011] Preferably, a discharge pipe is fixedly connected to the top of the airflow drying tower shell.

[0012] Preferably, one end of the discharge pipe away from the airflow drying tower shell is fixedly connected to a cyclone separator.

[0013] Preferably, the top interface of the cyclone separator is connected to a bag dust collector, and the air outlet of the bag dust collector is connected to an induced draft fan.

[0014] Preferably, the airflow drying tower shell, the cyclone separator, and the bottom port of the bag dust collector are all equipped with discharge valves.

[0015] The present invention has the following beneficial effects:

[0016] 1. The present invention delivers hot air into the airflow drying tower shell through the air inlet pipe. The hot air circulates upward in the airflow drying tower shell and directly acts on the mixed waste plastics discharged from the feed pipe, evaporating the moisture on the mixed waste plastics, so that the light plastics are separated from other heavy impurities, and continue to flow upward with the gas and are discharged through the discharge pipe. The separated heavy impurities fall downward under the action of gravity and accumulate at the bottom of the airflow drying tower shell, realizing the integrated operation of waste plastic drying and light and heavy separation, simplifying the processing flow, greatly improving the processing efficiency, and reducing time cost and equipment investment cost.

[0017] 2. The present invention controls the combustion conditions in the combustion chamber and the wind speed of the second blower to accurately adjust the temperature and wind speed of the hot air entering the airflow drying tower shell to meet the separation and drying requirements of waste plastics of different qualities and improve the separation and drying effects.

[0018] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 The figure is a schematic diagram of the layout of an airflow drying tower for separating light and heavy mixed waste plastics;

[0021] Figure 2 It is a cross-sectional schematic diagram of the air flow drying tower shell.

[0022] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0023] 1. Airflow drying tower shell; 2. High-speed zone; 3. Low-speed zone; 4. Windless zone; 5. Feed pipe; 6. Air inlet pipe; 7. Storage bin; 8. Discharge valve; 9. First blower; 10. Second blower; 11. Combustion chamber; 12. Discharge pipe; 13. Bag filter; 14. Induced draft fan; 15. Cyclone separator. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention. Specific embodiments

[0026] See also Figure 1-2 The present invention is an airflow drying tower for separating light and heavy mixed waste plastics, comprising an airflow drying tower shell 1, wherein a high-speed zone 2, a low-speed zone 3 and a windless zone 4 are sequentially arranged on the upper and lower inner cavities of the airflow drying tower shell 1, and a feed pipe 5 and an air inlet pipe 6 are fixedly connected to the upper and lower sides of the airflow drying tower shell 1, wherein the feed pipe 5 is connected to the high-speed zone 2, and one end of the feed pipe 5 away from the airflow drying tower shell 1 is fixedly connected to a storage bin 7, and one end of the storage bin 7 is connected to a first blower 9, and the wind force generated by the first blower 9 transports the waste plastics in the storage bin 7 to the airflow drying tower shell 1 through the feed pipe 5, thereby realizing automatic feeding of the waste plastics and ensuring the continuity and stability of the feeding process;

[0027] The air inlet pipe 6 is connected to the low-speed zone 3. The end of the air inlet pipe 6 away from the airflow drying tower shell 1 is fixedly connected to the second blower 10. The air inlet of the second blower 10 is connected to the combustion chamber 11. The hot air generated by the combustion chamber 11 enters the airflow drying tower shell 1 through the air inlet pipe 6 under the action of the second blower 10. The hot air circulates upward in the airflow drying tower shell 1 and directly acts on the mixed waste plastics discharged by the feed pipe 5, so that the moisture on the mixed waste plastics evaporates, and the light plastics are separated from other heavy impurities and continue to flow upward with the gas. The separated heavy impurities fall downward under the action of gravity. At the same time, the temperature and wind speed of the hot air can be accurately adjusted by controlling the combustion condition of the combustion chamber 11 and the wind speed of the second blower 10 to meet the drying requirements of different waste plastics and improve the drying effect.

[0028] The top of the airflow drying tower shell 1 is fixedly connected to a discharge pipe 12. The negative pressure at the inlet of the discharge pipe 12 is used to promote the airflow in the airflow drying tower shell 1 to flow into the discharge pipe 12. In this process, the separated light plastic is discharged into the discharge pipe 12 along with the airflow.

[0029] Therefore, according to the air flow velocity inside the airflow drying tower shell 1, the area of the inner cavity of the airflow drying tower shell 1 above the feed pipe 5 can be set as the high-speed zone 2, the area between the feed pipe 5 and the air inlet pipe 6 is the low-speed zone 3, and the area below the air inlet pipe 6 is the windless zone 4. The mixed waste plastics discharged from the feed pipe 5 need to pass through the high-speed zone 2 and the low-speed zone 3 in succession to complete drying and separation. The light plastics after separation and drying move upward with the air flow and are finally discharged from the discharge pipe 12, and the separated heavy impurities fall to the bottom of the airflow drying tower shell 1 under the action of gravity;

[0030] Specifically, one end of the discharge pipe 12 away from the airflow drying tower shell 1 is fixedly connected to the cyclone separator 15. The light plastic that has been dried and preliminarily separated enters the cyclone separator 15 through the discharge pipe 12. The cyclone separator 15 uses centrifugal force to further separate the light plastic from possible impurities such as flocculent matter, thereby improving the purity of the light plastic.

[0031] The top interface of the cyclone separator 15 is connected to the bag dust collector 13, and the air outlet of the bag dust collector 13 is connected to the induced draft fan 14. The bag dust collector 13 can absorb and collect impurities such as dust and flocs discharged from the cyclone separator 15 to prevent them from being discharged into the atmosphere and causing pollution. The induced draft fan 14 provides negative pressure for the entire system to ensure smooth flow of air.

[0032] The bottom ports of the airflow drying tower shell 1, the cyclone separator 15, and the bag dust collector 13 are all equipped with discharge valves 8. The above three discharge valves 8 are used to discharge heavy impurities, pure lightweight plastics inside the cyclone separator 15, and impurities collected by the bag dust collector 13 for subsequent processing.

[0033] The operation process of this embodiment is as follows: before processing the waste plastics, the fuel supply of the combustion chamber 11 and the wind speed of the second blower 10 are adjusted according to the material, humidity and other characteristics of the waste plastics, and the temperature and wind speed parameters of the hot air sent into the air inlet pipe 6 are accurately set to create suitable conditions for subsequent drying and separation work. After preparation, the first blower 9 is started, and the waste plastics in the storage bin 7 are continuously transported to the air flow drying tower shell 1 through the feed pipe 5 under the action of the negative pressure generated by it. The hot air entering from the air inlet pipe 6 directly acts on the mixed waste plastics. In this process, the hot air quickly takes away the moisture in the waste plastics to achieve the drying function; at the same time, the light plastics and heavy impurities begin to separate due to their own weight and the different airflow forces they are subjected to. The light plastics move upward under the push of the hot air flow, and the heavy impurities gradually sink under the action of gravity. After preliminary drying and separation, the light plastics Continuing upward, the waste plastic enters the cyclone separator 15 through the discharge pipe 12. The cyclone separator 15 uses the centrifugal force generated by high-speed rotation to further separate the light plastic from the fluff and other impurities contained therein. The pure light plastic is thrown to the inner wall of the separator, slides along the inner wall, and is discharged through the discharge valve 8 at the bottom of the cyclone separator 15. The fluff and other impurities are discharged from the interface at the top of the cyclone separator 15 and enter the bag dust collector 13. The bag dust collector 13 uses its fine filter bags to intercept impurities such as dust and fluff in the bags. The purified air is discharged from the air outlet. The collected impurities can be cleaned by opening the discharge valve 8 at the bottom of the bag dust collector 13. In the air drying tower shell 1, the sunken heavy impurities will accumulate at the bottom. The discharge valve 8 at the bottom of the air drying tower shell 1 can be opened regularly to discharge these substances, thus completing the entire light and heavy separation and drying process of waste plastics.

[0034] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0035] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An airflow drying tower for separating light and heavy mixed waste plastics, comprising an airflow drying tower shell (1), characterized in that: The airflow drying tower shell (1) has a high-speed zone (2), a low-speed zone (3) and a windless zone (4) arranged in sequence in the upper and lower parts of the inner cavity; The upper and lower sides of the airflow drying tower shell (1) are fixedly connected with a feed pipe (5) and an air inlet pipe (6) in sequence. The feed pipe (5) is connected to the high-speed zone (2). The end of the feed pipe (5) away from the airflow drying tower shell (1) is fixedly connected to a storage bin (7). The air inlet pipe (6) is connected to the low-speed zone (3). The end of the air inlet pipe (6) away from the airflow drying tower shell (1) is fixedly connected to a second blower (10). The air inlet of the second blower (10) is connected to a combustion chamber (11).

2. The airflow drying tower for separating light and heavy mixed waste plastics according to claim 1, characterized in that: One port of the storage bin (7) is connected to a first blower (9).

3. The airflow drying tower for separating light and heavy mixed waste plastics according to claim 2, characterized in that: The top of the airflow drying tower shell (1) is fixedly connected to a discharge pipe (12).

4. The airflow drying tower for separating light and heavy mixed waste plastics according to claim 3, characterized in that: One end of the discharge pipe (12) away from the airflow drying tower shell (1) is fixedly connected to a cyclone separator (15).

5. The airflow drying tower for separating light and heavy mixed waste plastics according to claim 4, characterized in that: The top interface of the cyclone separator (15) is connected to a bag dust collector (13), and the air outlet of the bag dust collector (13) is connected to an induced draft fan (14).

6. The airflow drying tower for separating light and heavy mixed waste plastics according to claim 5, characterized in that: The bottom ports of the airflow drying tower shell (1), the cyclone separator (15), and the bag dust collector (13) are all equipped with discharge valves (8).

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