Polyethylene granulation system

Abstract

The utility model discloses a polyethylene granulation system which comprises a degassing bin, a vibrating screen, a powder buffer hopper, a heating hopper and an extrusion granulator, a discharging port of the degassing bin is communicated with a feeding port of the vibrating screen, a powder outlet of the vibrating screen is communicated with a feeding port of the powder temporary storage hopper, and a block outlet of the vibrating screen is communicated with a feeding port of the heating hopper. And discharge ports of the powder buffer hopper and the heating hopper are communicated with a feed port of the extrusion granulator. The vibrating screen has the advantages that the connecting structure is simple and easy to implement, and the filtering capacity and the anti-blocking capacity of the vibrating screen on block materials are improved; resource recycling is achieved, waste is reduced, economic benefits are increased, energy waste is reduced, and the economic benefits and market competitiveness of enterprises are improved.

Description

Technical fields:

[0001] This utility model relates to a granulation system, and more particularly to a polyethylene granulation system. Background technology:

[0002] In today's modern industrial production, polyethylene, as an indispensable basic material, is playing an increasingly important role in various fields. The stable operation of polyethylene plants is directly related to the smooth development of numerous industries and the survival and growth of enterprises. However, the entire polyethylene plant production process faces many severe challenges.

[0003] Throughout the polyethylene production process, the sticky and lumpy physical characteristics of polyethylene powder make the granulation system highly unstable. Frequent feeding failures often lead to extruder shutdowns, severely impacting the unit's stable operation. Furthermore, polyethylene production is an interconnected process; any problem in any link, if not resolved quickly, can cause a complete shutdown of the entire unit. Therefore, the stable operation of the polyethylene granulation system is crucial to the overall operation of the plant and the company. Currently, the most significant challenge to the stable operation of the granulation system is undoubtedly the lumpy material problem in the feeding system. On one hand, lumps easily clog the feeding channels, causing poor feeding, production interruptions, and impacting efficiency and output. They can also cause the extruder to shut down due to lumps, damaging equipment and increasing maintenance costs and downtime. Additionally, lumps result in uneven particle size and irregular shape, affecting product quality. On the other hand, the lumps separated by the feeding system can only be sold as waste at a low price. According to statistics, the granulation feeding system generates about 2 tons of lumpy material every day, resulting in significant economic losses. Furthermore, the lumps cause considerable wear and damage to the equipment, increasing maintenance costs. These lumpy material issues pose a serious challenge to the stable operation of the polyethylene plant and the company's economic benefits. Therefore, technological research and development to overcome the impact of lumpy material on the polyethylene feeding system, and to study the lumpy material recycling process within the feeding system, are crucial for ensuring the stability of the granulation feeding system and the stable operation of the granulation unit, and are of great significance to the company's economic benefits. Utility model content:

[0004] The purpose of this invention is to provide a polyethylene granulation system with a simple connection structure and the ability to recycle resources.

[0005] This utility model is implemented by the following technical solution: The purpose of this patent is to provide a polyethylene granulation system, which includes a degassing chamber, a vibrating screen, a powder buffer hopper, a heating hopper, and an extrusion granulator; the discharge port of the degassing chamber is connected to the inlet of the vibrating screen, the powder outlet of the vibrating screen is connected to the inlet of the powder buffer hopper, the block material outlet of the vibrating screen is connected to the inlet of the heating hopper, and the discharge ports of the powder buffer hopper and the heating hopper are both connected to the inlet of the extrusion granulator.

[0006] Furthermore, the vibrating screen includes three layers of screens arranged sequentially from top to bottom. The first layer of screens has an inclination angle of 10° and a screen aperture size of 80-100 mesh; the second layer of screens has an inclination angle of 15° and a screen aperture size of 60-80 mesh; and the third layer of screens has an inclination angle of 25° and a screen aperture size of 40-60 mesh.

[0007] Furthermore, it also includes a steam pipeline, the outlet of which is connected to the air inlet of the jacket of the heating hopper.

[0008] Furthermore, it also includes a particle buffer hopper, a mixing silo, a separator, a cyclone separator, and a packaging silo; the discharge port of the extrusion granulator is connected to the inlet of the particle buffer hopper, the discharge port of the particle buffer hopper is connected to the inlet of the mixing silo, the discharge port of the mixing silo is connected to the inlet of the separator, the air outlet of the separator is connected to the inlet of the cyclone separator, and the discharge port of the separator is connected to the inlet of the packaging silo.

[0009] Furthermore, it also includes a rinsing water tank, the outlet of which is connected to the inlet of the mixing silo.

[0010] Furthermore, it also includes a dust collector, with the air outlet of the mixing hopper connected to the air inlet of the dust collector.

[0011] Advantages of this utility model: 1. The connection structure of this utility model is simple and easy to implement. By upgrading the filter screen of the vibrating screen from one layer to three layers, and increasing the screen hole size from the first layer to the third layer, the angles of the three layers of screens are adjusted. The tilt angle of the first layer of screen is 10°, mainly filtering large pieces and long strips of material; the tilt angle of the second layer of screen is 15°, filtering small pieces that were not successfully filtered by the first layer of screen; the tilt angle of the third layer of screen is 25°, further refining the filtration to meet the operating parameters of the feeding and extrusion granulator, thus improving the vibrating screen's filtration capacity for block materials and its anti-clogging ability; 2. For the block materials rejected by the vibrating screen, the block materials are conveyed to the heating hopper, melted at 200°C, and then conveyed to the extrusion granulator by a screw conveyor for granulation, realizing resource recycling, reducing waste generation, increasing economic benefits, reducing energy waste, and improving the economic benefits and market competitiveness of enterprises. Attached image description:

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0014] 1. Degassing chamber, 2. Vibrating screen, 3. Powder buffer hopper, 4. Heating hopper, 5. Extrusion granulator, 6. Steam pipeline, 7. Particle buffer hopper, 8. Blending hopper, 9. Separator, 10. Cyclone separator, 11. Packaging hopper, 12. Washing water tank, 13. Dust collector. Detailed implementation method:

[0015] Example: Figure 1 As shown, a polyethylene granulation system includes a degassing chamber 1, a vibrating screen 2, a powder buffer hopper 3, a heating hopper 4, an extrusion granulator 5, a steam pipeline 6, a granule buffer hopper 7, a blending hopper 8, a separator 9, a cyclone separator 10, a packaging hopper 11, a rinsing water tank 12, and a dust collector 13. The discharge port of the degassing chamber 1 is connected to the inlet of the vibrating screen 2, the powder outlet of the vibrating screen 2 is connected to the inlet of the powder buffer hopper 3, the block material outlet of the vibrating screen 2 is connected to the inlet of the heating hopper 4, the discharge ports of the powder buffer hopper 3 and the heating hopper 4 are both connected to the inlet of the extrusion granulator 5, and the steam pipeline 6 is connected to the air inlet of the jacket of the heating hopper 4.

[0016] The vibrating screen 2 comprises three layers of screens arranged sequentially from top to bottom. The first layer of screens has an inclination angle of 10° and a screen aperture size of 80-100 mesh; the second layer of screens has an inclination angle of 15° and a screen aperture size of 60-80 mesh; and the third layer of screens has an inclination angle of 25° and a screen aperture size of 40-60 mesh. By upgrading the filter screen of the vibrating screen 2 from one layer to three layers, and increasing the screen aperture size from the first to the third layer, and adjusting the angles of the three layers of screens, the first layer of screens, with an inclination angle of 10°, mainly filters large pieces and long strips of material; the second layer of screens, with an inclination angle of 15°, filters small pieces of material that were not successfully filtered by the first layer of screens; and the third layer of screens, with an inclination angle of 25°, further refines the filtration to meet the operating parameters of the feeding and extrusion granulator 5, thereby improving the filtering capacity and anti-clogging ability of the vibrating screen 2 for large pieces of material.

[0017] The discharge port of the extrusion granulator 5 is connected to the inlet of the granule buffer hopper 7. The discharge port of the granule buffer hopper 7 is connected to the inlet of the blending silo 8. The discharge port of the blending silo 8 is connected to the inlet of the separator 9. The air outlet of the separator 9 is connected to the inlet of the cyclone separator 10. The discharge port of the separator 9 is connected to the inlet of the packaging silo 11. The water outlet of the rinsing water tank 12 is connected to the water inlet of the blending silo 8. The air outlet of the blending silo 8 is connected to the air inlet of the dust collector 13.

[0018] Working Principle: The polyethylene material obtained from the reaction is desaturated in degassing chamber 1 to remove solvent. The polyethylene stream then enters vibrating screen 2 for sieving. The sieved powder is temporarily stored in powder buffer hopper 3, and then conveyed by screw conveyor to extrusion granulator 5 for heating and extrusion granulation. The sieved lumps enter heating hopper 4, melt at 200℃, and are then conveyed by screw conveyor to extrusion granulator 5 for heating and extrusion granulation. This process achieves resource recycling, reduces waste generation, increases economic benefits, reduces energy waste, and improves the company's economic efficiency and market competitiveness. The extruded granules are stored in granule buffer hopper 7, and are pneumatically conveyed to blending hopper 8. Other materials of different specifications are added according to customer requirements for mixing. After mixing, the mixture is pneumatically conveyed to separator 9, where airflow blows the powder to cyclone separator 10 to separate the dust. The granules in separator 9 are then sent to packaging hopper 11 for packaging.

[0019] Dust generated during the mixing process in the mixing silo 8 is discharged to the dust collector 13 for collection. The dust separated by the cyclone separator 10 and the dust collector 13 is sold as a by-product.

[0020] After the mixing is completed in the mixing bin 8, the rinsing water in the rinsing water tank 12 is pumped to the mixing bin 8 for cleaning to avoid contaminating the next batch of products.

[0021] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A polyethylene pelletizing system, characterized by, It includes a degassing bin, a vibrating screen, a powder buffer hopper, a heating hopper and an extrusion granulator; the discharge port of the degassing bin is communicated with the feeding port of the vibrating screen, the powder outlet of the vibrating screen is communicated with the feeding port of the powder buffer hopper, the block material outlet of the vibrating screen is communicated with the feeding port of the heating hopper, and the discharge ports of the powder buffer hopper and the heating hopper are both communicated with the feeding port of the extrusion granulator.

2. The polyethylene pelletizing system of claim 1, wherein, The vibrating screen comprises three layers of screen meshes arranged from top to bottom, the inclination angle of the first layer of screen mesh is 10°, and the screen hole size is 80-100 meshes; the inclination angle of the second layer of screen mesh is 15°, and the screen hole size is 60-80 meshes, and the inclination angle of the third layer of screen mesh is 25°, and the screen hole size is 40-60 meshes.

3. The polyethylene pelletizing system of claim 1, wherein, It further comprises a steam pipeline, and the gas outlet end of the steam pipeline is communicated with the gas inlet of the jacket of the heating hopper.

4. The polyethylene pelletizing system of any one of claims 1-3, wherein, It further comprises a particle buffer hopper, a blending material bin, an elutriator, a cyclone separator and a packaging bin; the discharge port of the extrusion granulator is communicated with the feeding port of the particle buffer hopper, the discharge port of the particle buffer hopper is communicated with the feeding port of the blending material bin, the discharge port of the blending material bin is communicated with the feeding port of the elutriator, the gas outlet of the elutriator is communicated with the feeding port of the cyclone separator, and the discharge port of the elutriator is communicated with the feeding port of the packaging bin.

5. The polyethylene pelletizing system of claim 4, wherein, It further comprises a flushing water tank, and the water outlet of the flushing water tank is communicated with the water inlet of the blending material bin.

6. The polyethylene pelletizing system of claim 4, wherein, It further comprises a dust collector, and the gas outlet of the blending material bin is communicated with the gas inlet of the dust collector. It further comprises a flushing water tank, and the water outlet of the flushing water tank is communicated with the water inlet of the blending material bin. It further comprises a dust collector, and the gas outlet of the blending material bin is communicated with the gas inlet of the dust collector.

Images