A polyethylene off-gas de-dusting device and method of use thereof

Abstract

The application discloses a polyethylene production waste gas powder removing device and a use method thereof, and belongs to the technical field of waste gas powder removing, which comprises a shell, a dust hopper arranged at the bottom of the shell, a waste gas pipe arranged at one side of the shell, an electric valve one arranged on the waste gas pipe, one end of a pulse device penetrating through a clean gas chamber, a plurality of cloth bag assemblies arranged in a powder removing chamber, the cloth bag assemblies being connected with the partition plate, the port of the pulse device facing the cloth bag assemblies, a gas flushing pipe arranged in the cloth bag assembly, a gas flushing chamber arranged at the bottom of the gas flushing pipe, a sealing element arranged in the gas flushing chamber, the cloth bag assembly and the gas flushing chamber being connected through a fixing pipe, a moving element movably connected with the sealing element being arranged in the fixing pipe, a knocking element arranged outside the cloth bag assembly, and one end of the knocking element movably connected with the moving element. The application does not need manual periodical cleaning, can realize automatic cleaning of the dust on the partition plate, and avoids dust gathering on the partition plate through knocking and shaking off each time.

Description

Technical Field

[0001] This invention belongs to the field of waste gas de-powdering technology, specifically relating to a waste gas de-powdering device for polyethylene production and its usage method. Background Technology

[0002] Polyethylene, or PE for short, is a thermoplastic resin produced by the polymerization of ethylene. The production of polyethylene generates waste gas, which needs to be discharged. However, this waste gas contains dust containing polyethylene powder or other additives, and direct emission would pollute the air. Therefore, dust removal treatment is necessary to ensure the waste gas meets emission standards. Existing dust removal devices generally use pulse dust collectors, which use filter bags to intercept dust in the waste gas. As dust accumulates on the surface of the filter bags, the dust collection resistance of the dust collector increases, and the pressure inside the dust removal chamber increases. When the pressure reaches a certain value, it is detected by a pressure sensor, which then transmits a signal to the pulse valve. When the pulse valve opens, high-pressure gas pulses through the filter bags, causing the dust on the bags to fall into the dust hopper of the pulse dust collector. However, when the dust-laden exhaust gas enters the dust collector, some of it adheres to the partition separating the clean air chamber and the dust removal chamber. Over time, as the dust thickness increases, the space in the dust removal chamber becomes smaller, leading to increased suction resistance of the fan, frequent opening of the pulse valve, excessive consumption of pulse gas, and waste of resources. Therefore, existing technology involves opening manholes in the outer shell of the dust collector, requiring workers to periodically enter and clean it. This is labor-intensive and requires shutting down the dust collector, affecting production efficiency. Summary of the Invention

[0003] To address the shortcomings of the existing technology, this invention provides a polyethylene production waste gas de-powdering device, the technical solution of which includes:

[0004] The casing has a dust hopper at its bottom, into which dust falling from the casing via pulse jets collects. An exhaust pipe with an electric valve on one side controls its operation. A fan with an exhaust duct at the top draws out exhaust gas, which is monitored by an electronic pressure gauge. The casing is internally divided into a clean air chamber and a dust removal chamber by a partition. The exhaust duct connects to the clean air chamber. A pulse jet device on one side of the casing opens or closes when it receives a signal from the electronic pressure gauge. One end of the pulse device passes through the clean air chamber, and several bag assemblies are arranged in the powder removal chamber. The bag assemblies are connected to the partition plate, and the port of the pulse device is directly opposite the bag assembly. The characteristic is that an air-inflating pipe is arranged inside the bag assembly, and an air-inflating chamber is arranged at the bottom of the air-inflating pipe. A sealing element is arranged in the air-inflating chamber. The gas of the pulse device first enters the air-inflating pipe, pushes open the sealing element, and then enters the air-inflating chamber. The bag assembly and the air-inflating chamber are connected by a fixed pipe. A movable element is arranged inside the fixed pipe and is movably connected to the sealing element. A knocking element is arranged outside the bag assembly, and one end of the knocking element is movably connected to the movable element.

[0005] Furthermore, the pulse device includes a gas tank, a pulse valve is provided on the gas tank, a pulse tube is provided on the pulse valve, the pulse tube extends into the clean air chamber, and a nozzle is provided at the bottom of the pulse tube. When the pulse valve is opened, the high-pressure gas in the gas tank enters the pulse tube. A support plate is provided on one side of the housing, and the gas tank is provided on the support plate.

[0006] Furthermore, the bag assembly includes a frame and a bag mounted on the frame. The frame is connected to a partition and is used to internally support and fix the bag. The upper part of the frame is open and the bottom is closed.

[0007] Furthermore, the upper end of the keel frame is provided with an external thread, and the partition plate is provided with an internal threaded opening. The keel frame is threadedly connected to the internal threaded opening, which facilitates the disassembly of the keel frame from the partition plate.

[0008] Furthermore, the keel frame is provided with a hoop groove, and the cloth bag is fixed to the hoop groove by the hoop ring. Opening the hoop groove makes it easy to remove the cloth bag from the keel frame.

[0009] Furthermore, the sealing element includes a sealing plate disposed inside the air inlet pipe, a lifting rod disposed at the bottom of the sealing plate, a set of fixed rods disposed along the circumferential direction on the lifting rod, an upper inclined block disposed on the fixed rod, a disc disposed inside the air inlet pipe, the disc being connected to the air inlet pipe by the fixed plate, the lifting rod passing through the disc, and a first spring disposed outside the lifting rod located between the fixed rod and the disc. When there is no pulse, the sealing plate seals the inside of the air inlet pipe, and the lifting rod moves up and down on the disc.

[0010] Furthermore, the movable component includes a piston plate disposed inside a fixed tube. A first push rod is disposed on one side of the piston plate and a second push rod is disposed on the other side. When the first push rod moves, it drives the piston plate and the second push rod to move. A lower inclined block is disposed on the second push rod, and the lower inclined block is connected to the upper inclined block. A second spring is disposed on the first push rod, and one end of the first push rod extends to the outside of the bag assembly. A ramp is disposed on the first push rod.

[0011] Furthermore, the striking element includes a flat plate disposed on the bag assembly, a striking rod passing through the flat plate, a striking ball disposed on the striking rod, a limiting plate disposed on the striking rod, a third spring disposed on the outside of the striking rod between the flat plate and the limiting plate, a roller disposed at the end of the striking rod, the roller being movably connected to the ramp, the movement of the ramp pushing the roller to move up or down, the rolling causing the striking rod and the striking ball to move up and down.

[0012] Furthermore, a dust discharge pipe is provided at the bottom of the ash hopper, and an electric valve is installed on the dust discharge pipe. When the electric valve is opened, the dust in the ash hopper is discharged through the dust discharge pipe.

[0013] The usage method includes the following steps:

[0014] Step 1: Open the electric valve and the fan. Under negative pressure, the dust-laden exhaust gas in the exhaust pipe enters the dust removal chamber.

[0015] Step 2: The dust-laden exhaust gas in the dust removal chamber passes through each bag filter assembly. The dust is trapped on the outer surface of the bag filter assembly, and the clean exhaust gas enters the inside of the bag filter assembly.

[0016] Step 3: The clean exhaust gas inside the bag filter assembly enters the clean air chamber through the upper part of the bag filter assembly, and the clean gas in the clean air chamber is drawn out and discharged by the fan through the exhaust pipe.

[0017] Step 4: When the dust on the outer surface of the bag assembly thickens and blocks the bag assembly, the suction resistance of the fan increases and the pressure difference changes to the set value, which is measured by the electronic pressure gauge. The electronic pressure gauge transmits the signal to the fan, electric valve 1 and pulse device. The fan and electric valve 1 close, and the pulse device opens.

[0018] Step 5: The pulse device releases high-pressure gas into the air-filling pipe. Under the high-pressure impact, the seal opens and moves downward, allowing gas to enter the air-filling chamber. The seal pushes the moving part to move outward, and the moving part then pushes the striking part upward, causing the striking part to strike the partition, causing the dust on the partition to fall off.

[0019] Compared with the prior art, the present invention has the following advantages: by using the high-pressure gas during each pulse, the sealing component pushes the moving component, the moving component pushes the striking component, and the striking component moves upward to strike the partition, causing the dust on the partition to be shaken off. The present invention does not require manual periodic cleaning and can realize the automatic cleaning of dust on the partition. By shaking off the dust with each strike, the accumulation of dust on the partition is avoided. Attached Figure Description

[0020] Figure 1 This is a structural diagram of the present invention;

[0021] Figure 2 This is the present invention. Figure 1 A magnified view of a portion at point a;

[0022] Figure 3 This is the present invention. Figure 2 A magnified view of part b;

[0023] Figure 4 This is a bottom view of the air chamber portion of the present invention;

[0024] Figure 5 This is a front view of the bag assembly of the present invention;

[0025] Figure 6 This is the present invention. Figure 5 A magnified view of a portion at point c;

[0026] Figure 7 This is a front view of the keel frame of the present invention;

[0027] Figure 8 This is the present invention. Figure 7 A magnified view of a portion at point d.

[0028] Attached Figures: 1. Shell, 2. Ash Hopper, 3. Exhaust Gas Pipe, 4. Electric Valve I, 5. Fan, 6. Exhaust Pipe, 7. Electronic Pressure Gauge, 8. Partition, 9. Clean Air Chamber, 10. De-dust Chamber, 11. Air Injection Pipe, 12. Air Injection Chamber, 13. Fixed Pipe, 14. Gas Tank, 15. Pulse Valve, 16. Pulse Pipe, 17. Nozzle, 18. Support Plate, 19. Frame, 20. Filter Bag, 21. Internal Threaded Port, 22. Hoop Groove, 23. Hoop Ring, 24. Sealing Plate, 25. Lifting Rod, 26. Fixed Rod, 27. Upper Inclined Block, 28. Disc, 29. Fixed Plate, 30. First Spring, 31. Piston Plate, 32. First Push Rod, 33. Second Push Rod, 34. Lower Inclined Block, 35. Second Spring, 36. Slope Block, 37. Flat Plate, 38. Striking Rod, 39. Striking Ball, 40. Limiting Plate, 41. Third Spring, 42. Roller, 43. Dust Exhaust Pipe, 44. Electric Valve II. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] Example

[0031] A polyethylene production waste gas de-powdering device includes a shell 1, a dust hopper 2 at the bottom of the shell 1, a waste gas pipe 3 on one side of the shell 1, an electric valve 4 on the waste gas pipe 3, a fan 5 at the top of the shell 1, an exhaust pipe 6 on the fan 5, and an electronic pressure gauge 7 on the exhaust pipe 6. The interior of the shell 1 is divided into a clean gas chamber 9 and a de-powdering chamber 10 from top to bottom by a partition 8. The exhaust pipe 6 is connected to the clean gas chamber 9. A pulse device is located on one side of the shell 1, with one end of the pulse device penetrating through the clean gas chamber 9. A [unclear - possibly a device name or function] is installed inside the de-powdering chamber 10. Several bag assemblies are provided, and the bag assemblies are connected to the partition plate 8. The port of the pulse device is directly opposite the bag assembly. An air-pressing pipe 11 is provided inside the bag assembly. An air-pressing chamber 12 is provided at the bottom of the air-pressing pipe 11. A sealing element is provided inside the air-pressing chamber. The bag assembly and the air-pressing chamber 12 are connected by a fixed pipe 13. A movable element is provided inside the fixed pipe 13 and is movably connected to the sealing element. A knocking element is provided outside the bag assembly. One end of the knocking element is movably connected to the movable element. A dust discharge pipe 43 is provided at the bottom of the dust hopper 2. An electric valve 44 is provided on the dust discharge pipe 43.

[0032] Please see Figure 1 The pulse device includes a gas tank 14, a pulse valve 15 on the gas tank 14, a pulse tube 16 on the pulse valve 15, the pulse tube 16 extends into the clean air chamber 9, a nozzle 17 is provided at the bottom of the pulse tube 16, a support plate 18 is provided on one side of the housing 1, and the gas tank 14 is provided on the support plate 18. When the pulse valve 15 receives a signal, it opens, and the high-pressure gas in the gas tank 14 enters the pulse tube 16 and is then sprayed downward through the nozzle 17.

[0033] Please see Figure 2-8 The bag assembly includes a frame 19 and a bag 20 mounted on the frame. The frame 19 is connected to a partition 8. The upper part of the frame 19 is open and the bottom is closed. The bag 20 is placed on the frame 19 from bottom to top, so that the bag 20 is in an open and filled position, which facilitates dust interception.

[0034] The upper end of the keel frame 19 is provided with an external thread, and the partition plate 8 is provided with an internal thread port 21. The keel frame 19 is threadedly connected to the internal thread port 21. When the keel frame 19 needs maintenance or replacement, it can be removed from the partition plate 8 simply by screwing it on.

[0035] The keel frame 19 is provided with a hoop groove 22. The cloth bag 20 is fixed to the hoop groove 22 by the hoop ring 23. When the cloth bag 20 is worn and needs to be replaced, simply unscrew the screw on the hoop ring 23 and remove the hoop ring 23 from the hoop groove 22 to remove the cloth bag 20 from the keel frame 19.

[0036] Please see Figure 1-3 The sealing element includes a sealing plate 24 disposed inside the air inlet pipe 11. A lifting rod 25 is disposed at the bottom of the sealing plate 24. A set of fixed rods 26 are disposed along the circumferential direction on the lifting rod 25. An upper inclined block 27 is disposed on the fixed rod 26. A disc 28 is disposed inside the air inlet chamber 12. The disc 28 is connected to the air inlet chamber 12 by a fixed plate 29. The lifting rod 25 passes through the disc 28. A first spring 30 is disposed outside the lifting rod 25 between the fixed rod 26 and the disc 28. When the high-pressure gas impacts the sealing plate 24, the sealing plate 24 drives the lifting rod 25 to move up and down on the disc 28, and drives the fixed rod 26 and the upper inclined block 27 to move down, and the first spring 30 is compressed.

[0037] Please see Figure 2-3 The movable component includes a piston plate 31 disposed within the fixed tube 13. A first push rod 32 is disposed on one side of the piston plate 31 and a second push rod 33 is disposed on the other side. A lower inclined block 34 is disposed on the second push rod 33 and is connected to an upper inclined block 27. A second spring 35 is disposed on the first push rod 32 and one end of the first push rod 32 extends to the outside of the bag assembly. A ramp 36 is disposed on the first push rod 32. When the upper inclined block 27 moves down, it pushes the lower inclined block 34 to move horizontally, and the second spring 35 is compressed. It is worth noting that when the first spring 30 is compressed to the lowest point, the upper end of the upper inclined block 27 is always on the lower inclined block 34 and does not move to the lower side of the lower inclined block 34, nor does it separate from the lower inclined block 34.

[0038] Please see Figure 3 The striking component includes a flat plate 37 mounted on the bag assembly, a striking rod 38 extending through the flat plate 37, a striking ball 39 mounted on the striking rod 38, a limiting plate 40 mounted on the striking rod 38, a third spring 41 located between the flat plate 37 and the limiting plate 40 on the outer side of the striking rod 38, and a roller 42 mounted at the end of the striking rod 38. The roller 42 is movably connected to the ramp 36. When the ramp 36 moves, it pushes the roller 42 to rotate and moves the roller 42 upward. The roller 42 drives the striking rod 38 and the striking ball 38 to move upward, compressing the third spring 41 and causing the striking ball 38 to strike the partition 8.

[0039] The method of using this invention is as follows:

[0040] Open the electric valve 4 and the fan 5. Under negative pressure, the dust-laden exhaust gas in the exhaust pipe 3 enters the dust removal chamber 10.

[0041] Dust-laden exhaust gas in the dust removal chamber 10 passes through each filter bag 20. The dust is trapped on the outer surface of the filter bag 20, and the clean exhaust gas enters the inside of the filter bag 20.

[0042] The clean exhaust gas in the bag 20 enters the clean air chamber 9 through the passage between the keel frame 19 and the air inlet pipe 11. The clean gas in the clean air chamber 9 is drawn out and discharged by the fan 5 through the exhaust pipe 6.

[0043] When the dust on the outer surface of the filter bag 20 thickens and blocks the filter bag 20, the suction resistance of the fan 5 increases and the pressure difference changes to the set value, which is measured by the electronic pressure gauge 7. The electronic pressure gauge 7 transmits the signal to the fan 5, the electric valve 4 and the pulse valve 15. The fan 5 and the electric valve 4 are closed, and the pulse valve 15 is opened.

[0044] High-pressure gas is released from gas tank 14 and enters the air-filling pipe 11. Under the high-pressure impact, the sealing plate 24 moves rapidly downward. The sealing plate 24 drives the lifting rod 25 to move downward within the disc 28, compressing the first spring 30. At the same time, the fixing rod 26 and the upper inclined block 27 move downward, and the high-pressure gas enters the air-filling chamber 12 and then enters the keel frame 19, pulsating the filter bag 20, causing the dust on the outer surface of the filter bag 20 to fall into the ash hopper 2. During the downward movement, the upper inclined block 27 pushes the lower inclined block 34 outward. The side push, the downward inclined block 34 drives the first push rod 32, piston plate 31, second push rod 33 and ramp 36 to move outward, the second spring 35 is compressed, the ramp 36 pushes the roller 42 to rotate and move it upward, the third spring 41 is compressed, the roller 42 drives the striking rod 38 and striking ball 39 to move upward, the striking ball 39 strikes the partition 8, causing the dust on the partition 8 to fall into the ash hopper 2. Every once in a while, the electric valve 44 is opened, and the dust in the ash hopper 2 is discharged through the dust discharge pipe 43.

Claims

1. A polyethylene production waste gas de-powdering device, comprising a shell, an ash hopper at the bottom of the shell, a waste gas pipe on one side of the shell, an electric valve on the waste gas pipe, a fan at the top of the shell, an exhaust pipe on the fan, an electronic pressure gauge on the exhaust pipe, the interior of the shell divided into a clean gas chamber and a de-powdering chamber from top to bottom by a partition, the exhaust pipe being connected to the clean gas chamber, a pulse device on one side of the shell, one end of the pulse device penetrating through the clean gas chamber, a plurality of bag filters being arranged in the de-powdering chamber, the bag filters being connected to the partition, the port of the pulse device facing the bag filters, characterized in that... The bag assembly contains an air inflator pipe with an air inflator chamber at its bottom. A sealing element is located within the air inflator chamber. The bag assembly and the air inflator chamber are connected by a fixed pipe. A movable element, movably connected to the sealing element, is located within the fixed pipe. An impact element is located outside the bag assembly, with one end movably connected to the movable element. The sealing element includes a sealing plate inside the air inflator pipe, a lifting rod at its bottom, a set of fixed rods along the circumferential direction on the lifting rod, an upper inclined block on the fixed rod, a disc inside the air inflator chamber connected to the air inflator chamber by the fixed plate, the lifting rod passing through the disc, and a first spring located between the fixed rods and the disc outside the lifting rod. The movable component includes a piston plate disposed inside a fixed tube. A first push rod is disposed on one side of the piston plate and a second push rod is disposed on the other side. A lower inclined block is disposed on the second push rod and the lower inclined block is connected to an upper inclined block. A second spring is disposed on the first push rod and one end of the first push rod extends to the outside of the bag assembly. A ramp is disposed on the first push rod. The striking element includes a flat plate mounted on the bag assembly, a striking rod extending through the flat plate, a striking ball mounted on the striking rod, a limiting plate mounted on the striking rod, a third spring located between the flat plate and the limiting plate on the outer side of the striking rod, and a roller mounted at the end of the striking rod, the roller being movably connected to the ramp.

2. The polyethylene production waste gas de-powdering device according to claim 1, characterized in that, The pulse device includes a gas tank, a pulse valve on the gas tank, a pulse tube on the pulse valve, the pulse tube extending into the clean air chamber, a nozzle at the bottom of the pulse tube, a support plate on one side of the housing, and a gas tank on the support plate.

3. The polyethylene production waste gas de-powdering device according to claim 1, characterized in that, The bag assembly includes a frame and a bag mounted on the frame. The frame is connected to a partition, and the upper part of the frame is open and the bottom is closed.

4. The polyethylene production waste gas de-powdering device according to claim 3, characterized in that, The upper end of the keel frame is provided with external threads, and the partition plate is provided with internal thread openings. The keel frame is threadedly connected to the internal thread openings.

5. The polyethylene production waste gas de-powdering device according to claim 4, characterized in that, The keel frame is provided with hoop grooves, and the cloth bag is fixed to the hoop grooves by the hoop rings.

6. The polyethylene production waste gas de-powdering device according to claim 1, characterized in that, The bottom of the ash hopper is equipped with a dust discharge pipe, and an electric valve is installed on the dust discharge pipe.

7. A polyethylene production waste gas de-dusting device according to any one of claims 1-6, characterized in that, The usage method includes the following steps: Step 1: Open the electric valve and the fan. Under negative pressure, the dust-laden exhaust gas in the exhaust pipe enters the dust removal chamber. Step 2: The dust-laden exhaust gas in the dust removal chamber passes through each bag filter assembly. The dust is trapped on the outer surface of the bag filter assembly, and the clean exhaust gas enters the inside of the bag filter assembly. Step 3: The clean exhaust gas inside the bag filter assembly enters the clean air chamber through the upper part of the bag filter assembly, and the clean gas in the clean air chamber is drawn out and discharged by the fan through the exhaust pipe. Step 4: When the dust on the outer surface of the bag assembly thickens and blocks the bag assembly, the suction resistance of the fan increases and the pressure difference changes to the set value, which is measured by the electronic pressure gauge. The electronic pressure gauge transmits the signal to the fan, electric valve 1 and pulse device. The fan and electric valve 1 close, and the pulse device opens. Step 5: The pulse device releases high-pressure gas into the air-filling pipe. Under the high-pressure impact, the seal opens and moves downward, allowing gas to enter the air-filling chamber. The seal pushes the moving part to move outward, and the moving part then pushes the striking part upward, causing the striking part to strike the partition, causing the dust on the partition to fall off.

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