Flue gas pretreatment device for granulation production of polypropylene regenerated granules

Abstract

The invention discloses a flue gas pretreatment device for polypropylene regenerated granule granulation production, and relates to the technical field of flue gas treatment, the flue gas pretreatment device comprises a box body, opposite angles of the upper end surface of the box body are respectively communicated with a flue gas inlet communicated with a flue gas outlet of an electromagnetic heating extruder and a flue gas outlet communicated with a soaking device; a plurality of flue gas filtering assemblies are arranged in the box body in the horizontal direction at equal intervals, and each flue gas filtering assembly is arranged in a drawing mode and comprises a filtering plate, a moving plate, a handle and a cleaning assembly used for cleaning the surface of the filtering plate; according to the invention, the content of impurities entering a subsequent soaking device and a spraying unit can be reduced, the problem that a pipeline is easy to block in existing flue gas treatment is effectively solved, abrasion and corrosion of impurities to subsequent equipment are reduced, and stable operation of a flue gas treatment system is guaranteed; the drawing type design is convenient to clean and maintain, impurities attached to the surface of the filter plate can be cleaned at any time without drawing out the filter plate, the operation is convenient and fast, and the practicability is high.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas treatment, and in particular to a flue gas pretreatment device for granulation production of polypropylene recycled granular materials. Background Art

[0002] Polypropylene recycled pellets are made from waste plastics, processed through physical methods such as screening, pretreatment, and melt granulation. During the production process, recycled polypropylene pellets are crushed and rinsed in primary and secondary crushers before being converted into molten polypropylene streams through electromagnetic heating. This process generates large amounts of industrial flue gas containing olefin gases, benzene, metal powder impurities, and dust. This flue gas also contains high levels of water, oil, and molten solid particulate matter.

[0003] In the existing flue gas treatment process, the flue gas enters the immersion device and the spray unit in sequence through the flue gas pipe to purify the flue gas. During the process, the flue gas pipe may be blocked by impurities such as molten polypropylene and metal powder, resulting in low flue gas treatment efficiency. At the same time, the corrosiveness of the flue gas to the pipe will greatly affect the service life of the flue gas pipe. Therefore, a flue gas pretreatment device is proposed to perform pretreatment on the flue gas before it enters the immersion device to remove larger particles or debris in the flue gas. Summary of the Invention

[0004] The object of the present invention is to provide a flue gas pretreatment device for granulation production of polypropylene recycled granules, aiming to solve the problem of easy blockage of flue gas pipelines during flue gas treatment in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a flue gas pretreatment device for the granulation production of polypropylene recycled granular materials, comprising a box body, wherein the diagonals of the upper end face of the box body are respectively connected to a smoke inlet for connecting with the smoke outlet of an electromagnetic heating extruder and a smoke outlet connected with a water immersion device, a plurality of groups of flue gas filter assemblies are arranged at equal intervals in the horizontal direction in the box body, the flue gas filter assemblies are arranged in a pull-out type, and the flue gas filter assembly includes a filter plate, a movable plate, a handle and a cleaning assembly for cleaning the surface of the filter plate, the filter plate is slidably connected to the inside of the box body, the movable plate is fixedly connected to one side of the filter plate, the handle is fixedly mounted on the movable plate, and the lower end face of the box body is connected to a conical lower hopper.

[0006] Furthermore, the cleaning assembly includes two scrapers, a handwheel, a screw and a slider, the two scrapers are slidably mounted on the two side surfaces of the filter plate respectively, the movable plate is a hollow structure, the screw is rotatably connected to the inside of the movable plate, the slider is threadedly connected to the outside of the screw and the outer surface slides with the inner wall of the movable plate, a limiting groove is provided through the fitting surface of the filter plate and the movable plate, one end of the scraper extends out of the limiting groove and is fixedly connected to the slider, the handwheel is arranged on the movable plate and is connected to the screw through a set of mutually meshing bevel gears.

[0007] Furthermore, it also includes a fixing component for limiting the movable plate, the fixing component includes a locking rod and a fixing block cooperating with the locking rod, the back side of the locking rod is rotatably connected to the side wall of the box body through a pin shaft, the fixing block is fixedly installed on the movable plate, and the back side of the locking rod is slidably engaged with the surface of the movable plate.

[0008] Furthermore, the cigarette filter holes on two adjacent filter plates are staggered.

[0009] Furthermore, a door is hingedly provided on the front side of the box body, and a supporting leg is fixedly connected to the bottom end of the box body.

[0010] The present invention has the following beneficial effects: The present invention provides a flue gas pretreatment device for the granulation production of polypropylene recycled granular materials, which can reduce the impurity content entering the subsequent immersion device and spray unit, effectively solve the problem of easy blockage of pipelines in existing flue gas treatment, reduce the wear and corrosion of subsequent equipment by impurities, and ensure the stable operation of the flue gas treatment system; the pull-out design is convenient for cleaning and maintenance, and the cleaning component can clean impurities attached to the surface of the filter plate at any time without pulling out the filter plate, which is convenient to operate and highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 Schematic diagram of the overall structure of the smoke filter assembly of the present invention; Figure 3 This is a cross-sectional view of the structure of the smoke filter assembly of the present invention; Figure 4 It is a schematic diagram of the lateral structure of the present invention; In the figure: 1. Box body; 2. Smoke inlet; 3. Smoke outlet; 4. Filter plate; 5. Moving plate; 6. Handle; 7. Conical hopper; 8. Scraper; 9. Handwheel; 10. Screw; 11. Slider; 12. Bevel gear; 13. Locking rod; 14. Fixing block; 15. Box door. DETAILED DESCRIPTION

[0012] like Figures 1 to 4 As shown, a flue gas pretreatment device for the granulation production of polypropylene recycled granular materials comprises a box body 1, and a smoke inlet 2 for communicating with the smoke outlet of an electromagnetic heating extruder and a smoke outlet 3 for communicating with a water immersion device are respectively connected at the diagonals of the upper end face of the box body 1. A plurality of groups of smoke filter assemblies are arranged at equal intervals in the horizontal direction in the box body 1, and the smoke filter assemblies are arranged in a pull-out type. The smoke filter assembly comprises a filter plate 4, a movable plate 5, a handle 6 and a cleaning assembly for cleaning the surface of the filter plate 4. The filter plate 4 is slidably connected to the inside of the box body 1, and the movable plate 5 is fixedly connected to one side of the filter plate 4. The handle 6 is fixedly installed on the movable plate 5. The lower end face of the box body 1 is connected to a conical lower hopper 7; a valve for controlling the discharge is installed at the outlet of the conical lower hopper 7, and the filter plate 4 can be pulled out of the box body 1 by the handle 6, so that the filter plate 4 can be thoroughly cleaned or replaced conveniently.

[0013] The cleaning assembly includes two scrapers 8, a handwheel 9, a screw 10 and a slider 11. The two scrapers 8 are slidably mounted on the two side surfaces of the filter plate 4 respectively. The movable plate 5 is a hollow structure for accommodating the screw 10 and the slider 11. The screw 10 is rotatably connected to the inside of the movable plate 5, and the slider 11 is threadedly connected to the outer side of the screw 10 and the outer surface slides with the inner wall of the movable plate 5. A limited slot is provided on the fitting surface of the filter plate 4 and the movable plate 5. One end of the scraper 8 extends out of the limit slot and is fixedly connected with the slider 11. The handwheel 9 is arranged on the movable plate 5 and is connected to the screw 10 by a set of mutually meshing bevel gears 12. By turning the handwheel 9, the screw 10 is driven to rotate through the bevel gear 12, so that the slider 11 moves on the screw 10, thereby driving the scraper 8 to clean the impurities attached to the surface of the filter plate 4 to prevent impurities from clogging the filter holes and affecting the filtering effect. The scraper 8 is specifically a stainless steel scraper or a polytetrafluoroethylene scraper.

[0014] It also includes a fixing component for limiting the movable plate 5, and the fixing component includes a locking rod 13 and a fixing block 14 that cooperates with the locking rod 13. The back of the locking rod 13 is rotatably connected to the side wall of the box body 1 through a pin shaft, and the fixing block 14 is fixedly installed on the movable plate 5. The back of the locking rod 13 slides with the surface of the movable plate 5; the movable plate 5 can be fixed during filtering work to ensure the stability of the filtering process.

[0015] The smoke filter holes on two adjacent filter plates 4 are staggered, which can extend the flow path of the smoke in the box 1, increase the filtering contact area, improve the filtering efficiency, and reduce the amount of impurities entering the subsequent processing device.

[0016] A door 15 is hingedly provided on the front side of the box body 1, and a support leg is fixedly connected to the bottom end of the box body 1; the interior of the box body 1 can be inspected and maintained by opening the door 15 hinged on the front side of the box body 1.

[0017] The specific operation process of the present invention is as follows: The generated flue gas is discharged from the smoke outlet of the electromagnetic heating extruder and enters the interior of the box 1 through the smoke inlet 2. The flue gas flows in the box 1 and passes through multiple groups of vertically arranged filter plates 4 in sequence while being decompressed. The filter holes on the filter plates 4 intercept larger particles, molten polypropylene, metal powder and other impurities in the flue gas, and the staggered distribution of the filter holes of adjacent filter plates 4 further improves the filtering effect.

[0018] When the filter plate 4 is attached to a large number of impurities and needs to be cleaned, the operator can rotate the handwheel 9, which drives the screw 10 to rotate through the meshing bevel gears 12. The rotation of the screw 10 causes the slider 11 threadedly connected to its outer side to slide along the inner wall of the movable plate 5, and the slider 11 drives the scraper 8 to slide on the surface of the filter plate 4, cleaning the impurities on both sides of the filter plate 4. The impurities fall to the bottom of the box body 1 under the action of gravity, and the valve is opened regularly for centralized recovery. If the filter plate 4 needs to be thoroughly cleaned or replaced, the locking rod 13 is first rotated to separate the locking rod 13 from the fixed block 14, releasing the limit of the movable plate 5, holding the handle 6, and pulling the movable plate 5 together with the filter plate 4 out of the box body 1 for cleaning or replacement. After maintenance is completed, the filter plate 4 is slid into the inside of the box body 1, and the locking rod 13 is rotated to cooperate with the fixed block 14 to limit the movable plate 5 to ensure normal filtering.

[0019] The immersion device is mainly composed of an immersion tank. The flue gas that has been filtered once is discharged through the smoke outlet 3 and enters the immersion device through the smoke inlet at the bottom of the immersion tank. The flue gas is cooled and subjected to secondary filtration through full contact with water. After the flue gas flows out from the smoke outlet at the top of the immersion device, it enters the spray unit through the flue gas pipe. This process passes through the primary circulating water spray tower and the secondary circulating water spray tower in sequence to sediment the large-mass pollutants entering the flue gas.

[0020] After the flue gas flows out from the spray unit, it enters the deodorization unit through the flue gas duct. In this process, it first enters the integrated biological deodorization device to convert the organic pollutants in the flue gas into inorganic substances, and then enters the low-temperature plasma purifier and the photo-oxidation activated carbon integrated machine in sequence to ionize and photo-oxidation decomposition and adsorption treatment of the olefin gas in the flue gas; after the flue gas flows out from the deodorization unit, the flue gas is discharged through the exhaust chimney by the induced draft fan, completing the flue gas treatment.

Claims

1. A flue gas pretreatment device for granulation production of polypropylene recycled granules, comprising a box (1), characterized in that: A smoke inlet (2) for communicating with the smoke outlet of the electromagnetic heating extruder and a smoke outlet (3) for communicating with the immersion device are respectively connected at the diagonal positions of the upper end face of the box body (1). A plurality of smoke filter assemblies are arranged at equal intervals in the horizontal direction in the box body (1). The smoke filter assemblies are arranged in a pull-out manner. The smoke filter assemblies include a filter plate (4), a movable plate (5), a handle (6) and a cleaning assembly for cleaning the surface of the filter plate (4). The filter plate (4) is slidably connected to the inside of the box body (1), the movable plate (5) is fixedly connected to one side of the filter plate (4), and the handle (6) is fixedly mounted on the movable plate (5). The lower end face of the box body (1) is connected to a conical lower hopper (7).

2. The flue gas pretreatment device according to claim 1, characterized in that: The cleaning assembly comprises two scrapers (8), a hand wheel (9), a screw (10) and a slider (11), wherein the two scrapers (8) are slidably mounted on the two side surfaces of the filter plate (4), respectively, and the movable plate (5) is a hollow structure, wherein the screw (10) is rotatably connected to the inside of the movable plate (5), and the slider (11) is threadedly connected to the outside of the screw (10) and the outer surface thereof is slidably matched with the inner wall of the movable plate (5), and a limiting slot is provided on the mating surface of the filter plate (4) and the movable plate (5), and one end of the scraper (8) extends out of the limiting slot and is fixedly connected to the slider (11), and the hand wheel (9) is arranged on the movable plate (5) and is connected to the screw (10) through a group of mutually meshing bevel gears (12).

3. The flue gas pretreatment device according to claim 1, characterized in that: The invention also includes a fixing assembly for limiting the position of the movable plate (5), wherein the fixing assembly includes a locking rod (13) and a fixing block (14) cooperating with the locking rod (13), the back of the locking rod (13) being rotatably connected to the side wall of the box body (1) via a pin, the fixing block (14) being fixedly mounted on the movable plate (5), and the back of the locking rod (13) being slidably cooperating with the surface of the movable plate (5).

4. The flue gas pretreatment device according to claim 1, characterized in that: The smoke filter holes on two adjacent filter plates (4) are staggered.

5. The flue gas pretreatment device according to claim 1, characterized in that: The front side of the box body (1) is hingedly provided with a box door (15), and the bottom end of the box body (1) is fixedly connected with a support leg.

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