Low-water-powder polyester pelletizing and drying system

Abstract

The utility model belongs to the technical field of polyester material processing, and particularly relates to a low-water-powder polyester pelletizing and drying system which comprises a pelletizing machine and a drying box, the drying box comprises a box body, an L-shaped partition plate is arranged in the box body and divides the inner space of the box body into a drying chamber, a separation chamber and a conveying chamber, a separation pipe is arranged in the separation chamber, and the conveying chamber is communicated with the drying chamber. A plurality of water filtering holes are formed in the pipe wall of the separating pipe, the bottom of the separating chamber is communicated with a drainage pipe, an inclined conveying belt is arranged in the conveying chamber, a spiral pipe is arranged in the drying chamber, a plurality of ventilation holes are formed in the pipe wall of the spiral pipe, and the top end of the spiral pipe is connected with a trumpet-shaped feeding pipe; the transverse air supply pipe blows the slices at the high end of the conveying belt into the trumpet-shaped feeding pipe; the bottom end of the spiral pipe is connected with a discharging pipe, an air outlet is formed in the bottom of the drying chamber, and a hot air blowing pipe is arranged on the top of the drying chamber. According to the utility model, the slices spirally descend along the spiral pipe, and meanwhile, hot air is introduced to blow downwards, so that the drying of the slices is realized, in the process, the collision frequency of the slices is less, the collision force is small, the generation amount of PET dust in the drying process can be greatly reduced, and the quality of the slices is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of polyester material processing, and in particular relates to a low-water-powder polyester pelletizing and drying system. Background Art

[0002] Bottle-grade polyester pelletizing system is a kind of equipment used to produce bottle-grade polyester chips, mainly including pelletizer, dryer, slicer classifier, etc. After being extruded from the cast strip head, polyester goes to the pelletizer together with spray water (deionized water). After being pelletized by the pelletizer, slices are obtained. The slices enter the dryer under the conveying water (deionized water), and the slices after drying enter the slicer classifier for screening. Among them, the tangential stress generated when the pelletizer cuts the polyester strips will generate dust. Moreover, when the drum dryer dries the slices, driven by the fast rotating drum, the slices move in a circle in the dryer, and the water is quickly thrown out by centrifugal action. The collision and friction between the slices and the dryer will generate a lot of dust. Not only that, the quality of the slices is damaged after the collision. Part of the dust in the drum dryer is discharged with the water, and the part that cannot be discharged enters the circulating deionized water system with the conveying water. In this way, since the circulating deionized water contains PET dust, it needs to be filtered to remove the dust before use. In order to improve the filtering effect of circulating water, a common method is to set up a multi-stage filter. However, due to the large amount of dust entering the circulating water system, the filter backwashing frequency is high and the water consumption is large. Utility Model Content

[0003] The utility model aims to provide a low-water powder polyester pelletizing and drying system to solve the problem that the existing pelletizing dryer generates a large amount of dust.

[0004] In order to achieve the above-mentioned purpose, the scheme of the utility model is as follows: a low-water powder polyester pelletizing and drying system, including a pelletizer and a drying box, a feeding channel for conveying slices and conveying water to the drying box is provided between the pelletizer and the drying box, the drying box includes a box body, an L-shaped partition is provided in the box body, the L-shaped partition divides the internal space of the box body into a drying chamber, a separation chamber and a conveying chamber, a separation tube is provided in the separation chamber, a plurality of water filtering holes are opened on the tube wall of the separation tube, a drainage pipe is connected to the bottom of the separation chamber, an inclined conveyor belt is provided in the conveying chamber, and the conveyor belt is provided with a plurality of water filtering holes, a plurality of water filtering holes are opened on the tube wall of the separation chamber ... The lower end is located below the discharge port of the separation tube. A spiral tube is arranged in the drying chamber. A plurality of ventilation holes are opened on the tube wall of the spiral tube. A trumpet-shaped feed pipe is connected to the top end of the spiral tube. The inlet of the trumpet-shaped feed pipe faces the high end of the conveyor belt. A transverse air supply pipe is arranged in the conveying chamber. The air outlet of the transverse air supply pipe faces the high end of the conveyor belt. The air outlet of the transverse air supply pipe is opposite to the inlet of the trumpet-shaped feed pipe. The bottom end of the spiral tube is connected to the discharge pipe. The discharge pipe runs through the side wall of the drying chamber. An exhaust port is arranged at the bottom of the drying chamber. A hot air blowing pipe is arranged at the top of the drying chamber.

[0005] The working principle and beneficial effects of this scheme are as follows: in this scheme, the slices and the conveying water enter the separation tube in the separation chamber to separate the slices from the conveying water, the wet slices fall on the lower end of the conveyor belt in the conveying chamber, and are conveyed by the conveyor belt, and the slices at the high end of the conveyor belt are blown to the trumpet-shaped feeding tube by the transverse air supply pipe, and then the slices descend along the spiral tube in the drying chamber, and are dried by the hot air blown by the hot air blowing pipe during the descent process, and the hot air takes away the moisture of the slices and the dust attached to the surface of the slices, thereby drying the slices. In this scheme, hot air is used to gently dry the slices, and the slices are subjected to fewer collisions and smaller collision forces in the drying box, thereby greatly reducing the amount of PET dust generated during the drying process and improving the quality of the slices. Moreover, in the present solution, the slices are separated from the conveying water before contacting with the hot air, and the drying chamber is isolated from the separation chamber, and the drying chamber is isolated from the conveying chamber. Therefore, the dust generated during the slice drying process leaves the box with the hot air and will not enter the circulating water system. In this way, after the dust entering the circulating water system is effectively reduced, the frequency of filter backwashing is effectively reduced, thereby effectively reducing water consumption and reducing production costs.

[0006] Optionally, the conveying chamber is also provided with a spiral feeder, a material receiving disc and a material receiving chute. The material receiving disc is located below the lower end of the conveyor belt. The material receiving disc is funnel-shaped. A material leakage port is provided at the center of the material receiving disc. The material leakage port is opposite to the feed port of the spiral feeder. The material receiving chute is inclined. The vertical projection of the high end of the conveyor belt falls on the material receiving chute. The lower end of the material receiving chute is connected with the material receiving disc or the feed port of the spiral feeder. The discharge port of the spiral feeder is located above the conveyor belt.

[0007] In this solution, the receiving disc and the receiving slide can receive the slices that fall from the conveyor belt and transport these slices to the spiral feeder, which then transports these slices back to the conveyor belt to avoid manual cleaning of the fallen slices.

[0008] Optionally, a flexible baffle is provided at the discharge port of the separation tube.

[0009] In this solution, a flexible baffle is used to limit the discharge port of the separation tube to ensure that all slices discharged from the separation tube can fall onto the conveyor belt.

[0010] Optionally, a blowing pipe is further provided in the conveying chamber, and the blowing pipe is located above the conveyor belt, and an air outlet of the blowing pipe is perpendicular to the conveyor belt.

[0011] In this solution, the wind blown out by the blow pipe is perpendicular to the conveyor belt, so that, on the one hand, the wet slices can be dried to a certain extent, and on the other hand, wind pressure can be applied to the wet slices to prevent the slices from sliding down the conveyor belt.

[0012] Optionally, a blocking bar is provided on the conveyor belt for preventing the slices from sliding down.

[0013] In this solution, the blocking strip is used to prevent the slices from sliding down the conveyor belt.

[0014] Optionally, the system further comprises a desalted water pool and a filter I, the end of the drain pipe away from the drying box is connected to the filter I, and the water outlet of the filter I is connected to the desalted water pool.

[0015] In this scheme, after the transport water in the separation chamber is separated from the slices, it flows into the filter I through the drainage pipe for filtration and then flows into the desalted water pool for recycling.

[0016] Optionally, the system also includes a blower unit and a heat exchange air duct, the blower unit includes several blowers, the air outlet of the blower is connected to the air outlet duct, the several air outlet ducts are all connected to the heat exchange air duct, and a valve is installed on the air outlet duct; the heat exchange air duct has a spiral coil section, the spiral coil section is located in the desalted water pool, and the end of the heat exchange air duct away from the blower is connected to the hot air blowing pipe.

[0017] In this scheme, the temperature of the circulating water in the desalted water pool is 60-70°C (the circulating water of the desalted water pool also comes from the cooling water used to cool the ester strips. The temperature of the cooling water is high. After the cooling water and the conveying water are mixed in the desalted water pool, the circulating water in the desalted water pool is 60-70°C). In this way, the spiral coil section of the heat exchange duct is located in the desalted water pool, and the air in the spiral coil section exchanges heat with the circulating water in the desalted water pool. The temperature of the air after the heat exchange is about 40°C. On the one hand, it can ensure that the temperature of the slice drying is appropriate and will not cause the slice temperature to be too high and sticky. On the other hand, it can utilize the waste heat of polyester pelletizing production to achieve the purpose of energy saving and emission reduction.

[0018] Optionally, the transverse air supply duct is connected to the heat exchange air duct.

[0019] In this solution, the horizontal air supply duct does not need to be connected to additional equipment such as a blower, thereby reducing equipment investment costs.

[0020] Optionally, regulating valves are installed on both the hot air blowing pipe and the transverse air supply pipe.

[0021] In this solution, the air volume in the hot air blowing pipe and the horizontal air supply pipe is adjusted by a regulating valve.

[0022] Optionally, the system further comprises a filter II, a circulation pump and a heat exchanger, and the circulating water in the desalted water pool is transported to the feed port of the pelletizer and the starting end of the feeding channel through the filter II and the heat exchanger under the action of the circulation pump.

[0023] In this scheme, the circulating water in the desalted water pool is filtered by filter II, cooled by the heat exchanger, and then sent to the feed port of the pelletizer and the starting end of the feeding channel, so as to realize the reuse of the transported water. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic structural diagram of a low-water-powder polyester pelletizing and drying system in Embodiment 1 of the present utility model;

[0025] Figure 2 This is a schematic diagram of the structure of a drying box in Embodiment 1 of the present utility model;

[0026] Figure 3 This is a schematic diagram of the structure of the drying chamber in the first embodiment of the utility model;

[0027] Figure 4 This is a schematic diagram of the structure of a drying box in Embodiment 2 of the present utility model;

[0028] Figure 5 This is a schematic diagram of the relative position between the blowing pipe and the conveyor belt in the third embodiment of the present utility model. DETAILED DESCRIPTION

[0029] The following is further described in detail through specific implementation methods:

[0030] The symbols in the drawings of the specification include: strip casting head 1, pelletizer 2, drying box 3, box body 310, L-shaped partition 320, drying chamber 301, exhaust port 3011, separation chamber 302, conveying chamber 303, slicer classifier 4, desalted water pool 5, blower 6, heat exchange duct 7, spiral coil section 701, filter I 8, heat exchanger 9, circulation pump 10, filter II 11, feeding channel I 12, feeding channel , conveyor belt 15, flexible baffle 16, spiral tube 17, trumpet-shaped feed pipe 18, horizontal air supply pipe 19, discharge pipe 20, hot air blowing pipe 21, air outlet pipe 22, valve 23, regulating valve 24, drain pipe 25, return pipe I 26, return pipe II 27, water supply pipe I 28, water supply pipe II 29, spiral feeder 30, receiving disc 31, receiving slide 32, and blowing pipe 33.

[0031] Embodiment 1

[0032] This embodiment is basically Figure 1 As shown: A low-water powder polyester pelletizing and drying system, including a casting strip head 1, a pelletizer 2, a drying box 3, a slice classifier 4, a desalted water pool 5, a blower unit, a heat exchange duct 7, a filter Ⅰ8, a heat exchanger 9, a circulation pump 10 and a filter Ⅱ11. A feeding channel Ⅰ12 is provided between the casting strip head 1 and the pelletizer 2 to feed the ester strips into the pelletizer 2, and a feeding channel Ⅱ13 is provided between the pelletizer 2 and the drying box 3 to transport the slices and conveying water to the drying box 3. Figure 2As shown, the drying box 3 includes a box body 310, and an L-shaped partition 320 is arranged in the box body 310. The L-shaped partition 320 divides the internal space of the box body 310 into a drying chamber 301, a separation chamber 302 and a conveying chamber 303. A separation tube 14 is arranged in the separation chamber 302, and the separation tube 14 is connected to the feeding channel II 13. A plurality of water filtering holes are opened on the tube wall of the separation tube 14. An inclined conveyor belt 15 is arranged in the conveying chamber 303, and the lower end of the conveyor belt 15 is located below the discharge port of the separation tube 14. The discharge port of the separation tube 14 is provided with a flexible baffle 16, and the flexible baffle 16 is used to limit the discharge of the slices to ensure that the slices fall on the conveyor belt 15. The conveyor belt 15 is provided with a plurality of blocking bars for preventing the slices from sliding down. In this embodiment, the spacing between two adjacent blocking bars is 20 cm.

[0033] Combination Figure 3 As shown, a spiral tube 17 is provided in the drying chamber 301, and the slope of the spiral tube 17 is moderate, so as to avoid being too large and causing the slice drying time to be too short, and to avoid being too small and causing the slice spiral falling movement to be blocked. A plurality of ventilation holes (not shown in the figure) are provided on the tube wall of the spiral tube 17, and the aperture of the ventilation holes is smaller than the specification of the slice. The top of the spiral tube 17 is connected with a trumpet-shaped feed pipe 18, and the inlet of the trumpet-shaped feed pipe 18 faces the high end of the conveyor belt 15. A transverse air supply pipe 19 is provided in the conveying chamber 303, and the air outlet of the transverse air supply pipe 19 faces the high end of the conveyor belt 15, and the air outlet of the transverse air supply pipe 19 is opposite to the inlet of the trumpet-shaped feed pipe 18, so that air is blown to the top of the conveyor belt 15 through the transverse air supply pipe 19, and the slices at the top of the conveyor belt 15 are blown into the trumpet-shaped feed pipe 18. The bottom end of the spiral tube 17 is connected to a discharge pipe 20, which passes through the rear side wall of the drying chamber 301 and is connected to the slice grader 4. An exhaust port 3011 is provided at the bottom of the drying chamber 301, and a hot air blowing pipe 21 is provided at the top of the drying chamber 301. In another embodiment, the hot air blowing pipe 21 is located at the bottom of the drying chamber 301, and the exhaust port 3011 is located at the top of the drying chamber 301, so that the hot air is blown from bottom to top.

[0034] The blower unit includes a plurality of blowers 6. In this embodiment, the power of any two blowers 6 is different. The number of blowers 6 is five, and the power is 55KW, 37KW, 22KW, 15KW, and 9KW respectively. The air outlet of the blower 6 is connected with an air outlet pipe 22, and the air outlet pipe 22 is connected with the heat exchange air pipe 7. A valve 23 is installed on the air outlet pipe 22, so that the air volume of the air outlet pipe 22 is adjusted by the valve 23. The heat exchange air pipe 7 has a spiral coil section 701, and the spiral coil section 701 is located in the desalted water pool 5. The end of the heat exchange air pipe 7 away from the blower 6 is connected to the hot air blowing pipe 21, and the transverse air supply pipe 19 is connected to the heat exchange air pipe 7. The hot air blowing pipe 21 and the transverse air supply pipe 19 are both installed with regulating valves 24, so that the air volume in the hot air blowing pipe 21 and the transverse air supply pipe 19 is adjusted by the regulating valve 24.

[0035] The bottom of the separation chamber 302 is connected to a drain pipe 25, and the bottom of the feeding channel I12 near the pelletizer 2 is connected to a return pipe I26 ( Figure 1 In the figure, arrows indicate the direction of circulating water flow and air flow), the bottom of the feeding channel Ⅱ13 near the pelletizer 2 is connected with a return pipe Ⅱ27, the drain pipe 25, the return pipe Ⅰ26 and the return pipe Ⅱ27 are all connected to the water inlet of the filter Ⅰ8, and the water outlet of the filter Ⅰ8 is connected to the desalted water pool 5. The top of the feeding channel Ⅰ12 near the pelletizer 2 is provided with a water supply pipe Ⅰ28, and the top of the feeding channel Ⅱ13 near the pelletizer 2 is provided with a water supply pipe Ⅱ29, and the water outlet of the water supply pipe Ⅱ29 is farther away from the pelletizer 2 than the water inlet of the return pipe Ⅱ27; the end of the water supply pipe Ⅱ29 away from the feeding channel Ⅱ13 is connected with the water supply pipe Ⅰ28, and the end of the water supply pipe Ⅰ28 away from the feeding channel Ⅰ12 is connected to the heat exchanger 9, and the heat exchanger 9, the circulating pump 10 and the filter Ⅱ11 are connected in sequence, and the water inlet of the filter Ⅱ11 is connected to the desalted water pool 5.

[0036] In actual use, the blower unit is started, and at the same time, the ester strips extruded from the casting head 1 enter the pelletizer 2 through the feeding channel I 12. In this process, desalted water is sprayed on the ester strips, so that the ester strips are cooled by contact with the desalted water. The cooled ester strips enter the pelletizer 2 for pelletizing. After the slices are obtained, the slices are moved to the drying box 3 in the feeding channel II 13 together with the conveying water. Then, the slices enter the separation tube 14 together with the conveying water, and the conveying water flows out through the water filter holes on the separation tube 14, so as to separate the slices from the conveying water. Then, the slices fall to the lower end of the conveyor belt 15 through the discharge port of the separation tube 14, and are conveyed by the conveyor belt 15 to the vicinity of the trumpet-shaped feeding tube 18. At the same time, the transverse air supply pipe 19 blows out relatively strong hot air, so that the slices at the high end of the conveyor belt 15 are blown into the trumpet-shaped feeding tube 18 (the hot air blown out by the transverse air supply pipe 19 can also blow away the wet slices stuck together). In this way, the slices slide down along the spiral tube 17 under the action of the lateral wind kinetic energy and their own gravitational potential energy. During the spiral falling process of the slices, the hot air blowing tube 21 blows hot air, and the hot air flows from the top of the drying chamber 301 to the bottom of the drying chamber 301. The hot air contacts the slices through the ventilation holes on the spiral tube 17, takes away the moisture of the slices and the dust attached to the slices, and leaves the drying chamber 301 through the exhaust port 3011 at the bottom of the drying chamber 301, thereby achieving the drying of the slices. The dried slices enter the slice classifier 4 through the discharge pipe 20 for screening. During the drying process of the slices, the slices spirally fall in the spiral tube 17, and the number of collisions and the collision force are small. Therefore, the amount of PET dust generated by the slices during the drying process is small. Compared with the rotary drum dryer, this embodiment can effectively reduce the amount of PET dust generated and improve the quality of the slices (the collision force on the slices is small and not easily damaged).

[0037] In the above process, the cooling water in the feeding channel Ⅰ12 flows into the filter Ⅰ8 through the return pipe Ⅰ26, part of the delivery water flowing out of the discharge port of the pelletizer 2 flows into the filter Ⅰ8 through the return pipe Ⅱ27, and the delivery water in the separation chamber 302 flows into the filter Ⅰ8 through the drain pipe 25. These three parts of water flow into the desalted water pool 5 after being filtered. Subsequently, under the action of the circulation pump 10, the circulating water in the desalted water pool 5 is filtered by the filter Ⅱ11, and then after heat exchange and cooling in the heat exchanger 9, it is transported to the corresponding parts before and after the pelletizer 2 through the water delivery pipe Ⅰ28 and the water delivery pipe Ⅱ29, thereby realizing the recycling of the desalted water.

[0038] In addition, since the temperature of the cooling water flowing into the desalted water pool 5 is relatively high, after the cooling water and the conveying water are mixed in the desalted water pool 5, the water temperature is 60-70°C. The air flows through the spiral coil section 701 under the action of the blower 6, so that the air and the circulating water in the desalted water pool 5 are heat exchanged, and the temperature of the air rises to about 40°C, and then the hot air enters the hot air blowing pipe 21 and the horizontal air supply pipe 19 to start using. In addition, the air volume of the hot air blowing pipe 21 and the horizontal air supply pipe 19 can be adjusted by the regulating valve 24. In this way, in the drying chamber 301, the temperature of the hot air blown out by the hot air blowing pipe 21 is about 40°C, which avoids the sticking of the slices due to excessive temperature; secondly, the embodiment utilizes the waste heat of polyester pelletizing production, achieving the purpose of energy saving and emission reduction.

[0039] In addition, the five blowers 6 in the blower group have different powers, and workers can turn on blowers 6 of different powers to supply air according to different situations. For example, different blowers 6 can be selected for use alone or in combination according to parameters such as outdoor air temperature, slice output, and slice moisture content.

[0040] In summary, in this embodiment, the slices are separated from the conveying water in the separation chamber 302, and then spirally descend in the drying chamber 301, and are swept from top to bottom by hot air. Compared with the rotary drum dryer, the slice drying process in this embodiment is gentle, which greatly reduces the amount of PET dust generated during the drying process and improves the slice quality. Moreover, the drying chamber 301 and the separation chamber 302 are separated by an L-shaped partition 320, and the dust in the drying chamber 301 will not enter the separation chamber 302, which means that the PET dust generated in the drying chamber 301 will not enter the conveying water of the separation chamber 302, that is, the PET dust in the slice drying process will not enter the circulating water system, effectively reducing the backwashing frequency of the filter Ⅰ8 and the filter Ⅱ11, thereby effectively reducing the water consumption, and further reducing the production cost.

[0041] Embodiment 2

[0042] The difference between this embodiment and the first embodiment is that: Figure 4 As shown, in this embodiment, a spiral feeder 30, a receiving disc 31 and a receiving chute 32 are also provided in the conveying chamber 303. The receiving disc 31 is located below the lower end of the conveyor belt 15. The receiving disc 31 is funnel-shaped. A material leakage port is provided at the center of the receiving disc 31, and the material leakage port is opposite to the feed port of the spiral feeder 30. The receiving chute 32 is inclined, and the vertical projection of the high end of the conveyor belt 15 falls on the receiving chute 32. The lower end of the receiving chute 32 is connected with the receiving disc 31 or the feed port of the spiral feeder 30, and the discharge port of the spiral feeder 30 is located above the conveyor belt 15. In this embodiment, the lower end of the receiving chute 32 is connected with the feed port of the spiral feeder 30; the receiving chute 32 is low in the middle and high on both sides in the length direction.

[0043] When the slices are transported on the conveyor belt 15, and when the horizontal air supply pipe 19 blows the slices at the high end of the conveyor belt 15, the slices may fall from the conveyor belt 15 to the bottom surface of the conveying chamber 303. Therefore, in this embodiment, if the slices fall from the low end of the conveyor belt 15, they will fall on the receiving disc 31 and fall into the feeding port of the spiral feeder 30 through the leakage port of the receiving disc 31; if the slices fall from the middle section and the high end of the conveyor belt 15, they will fall on the receiving chute 32 and slide along the receiving chute 32 to the feeding port of the spiral feeder 30. In this way, the fallen slices can fall into the spiral feeder 30 and be transported to the conveyor belt 15 by the spiral feeder 30, avoiding manual cleaning of the fallen slices.

[0044] Embodiment 3

[0045] The difference between this embodiment and the first or second embodiment is that: Figure 5 As shown, in this embodiment, a blowing pipe 33 is further provided in the conveying chamber 303, and the blowing pipe 33 is located above the conveyor belt 15, and the air outlet of the blowing pipe 33 is perpendicular to the conveyor belt 15. One end of the blowing pipe 33 away from the conveyor belt 15 is connected to the heat exchange air pipe 7, and a regulating valve is also installed on the blowing pipe 33.

[0046] In this embodiment, the hot air blown out by the blowing pipe 33 is perpendicular to the conveyor belt 15 , so that, on the one hand, the wet slices on the conveyor belt 15 can be dried to a certain extent, and on the other hand, wind pressure can be applied to the wet slices to prevent the slices from sliding down along the conveyor belt 15 .

[0047] The above is only an embodiment of the utility model, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the utility model. The specific implementation methods and other records in the specification can be used to explain the content of the claims.

Claims

1. A low-water-powder polyester pelletizing and drying system, comprising a pelletizer and a drying box, wherein a feeding channel is provided between the pelletizer and the drying box for conveying the pelletized pieces and conveying water into the drying box, characterized in that: The drying box includes a box body, an L-shaped partition is arranged in the box body, and the L-shaped partition divides the internal space of the box body into a drying chamber, a separation chamber and a conveying chamber. A separation tube is arranged in the separation chamber, and a plurality of water filtering holes are opened on the tube wall of the separation tube. The bottom of the separation chamber is connected with a drainage pipe. An inclined conveyor belt is arranged in the conveying chamber, and the lower end of the conveyor belt is located below the discharge port of the separation tube. A spiral tube is arranged in the drying chamber, and a plurality of ventilation holes are opened on the tube wall of the spiral tube. The top end of the spiral tube is connected with a trumpet-shaped feeding pipe, and the inlet of the trumpet-shaped feeding pipe faces the high end of the conveyor belt. A transverse air supply pipe is arranged in the conveying chamber, and the air outlet of the transverse air supply pipe faces the high end of the conveyor belt, and the air outlet of the transverse air supply pipe is opposite to the inlet of the trumpet-shaped feeding pipe; the bottom end of the spiral tube is connected with a discharge pipe, and the discharge pipe runs through the side wall of the drying chamber. An exhaust port is arranged at the bottom of the drying chamber, and a hot air blowing pipe is arranged at the top of the drying chamber.

2. The low-water-powder polyester pelletizing and drying system according to claim 1, characterized in that: The conveying chamber is also provided with a spiral feeder, a material receiving disc and a material receiving chute. The material receiving disc is located below the lower end of the conveyor belt. The material receiving disc is funnel-shaped. A material leakage port is provided at the center of the material receiving disc. The material leakage port is opposite to the feed port of the spiral feeder. The material receiving chute is inclined. The vertical projection of the high end of the conveyor belt falls on the material receiving chute. The lower end of the material receiving chute is connected with the material receiving disc or the feed port of the spiral feeder. The discharge port of the spiral feeder is located above the conveyor belt.

3. The low-water-powder polyester pelletizing and drying system according to claim 1, characterized in that: The discharge port of the separation tube is provided with a flexible baffle.

4. The low-water-powder polyester pelletizing and drying system according to claim 1, characterized in that: The conveying chamber is also provided with a blowing pipe, which is located above the conveyor belt, and the air outlet of the blowing pipe is perpendicular to the conveyor belt.

5. The low-water-powder polyester pelletizing and drying system according to claim 1, characterized in that: The conveyor belt is provided with a blocking strip for preventing the slices from sliding down.

6. The low-water-powder polyester pelletizing and drying system according to claim 1, characterized in that: The system also includes a desalted water pool and a filter I. The end of the drain pipe away from the drying box is connected to the filter I, and the water outlet of the filter I is connected to the desalted water pool.

7. The low-water-powder polyester pelletizing and drying system according to claim 6, characterized in that: The system also includes a blower unit and a heat exchange air duct. The blower unit includes a plurality of blowers. The air outlet of the blower is connected to an air outlet duct. The plurality of air outlet ducts are all connected to the heat exchange air duct. A valve is installed on the air outlet duct. The heat exchange air duct has a spiral coil section. The spiral coil section is located in the desalted water pool. The end of the heat exchange air duct away from the blower is connected to the hot air blowing pipe.

8. The low-water-powder polyester pelletizing and drying system according to claim 7, characterized in that: The transverse air supply pipe is communicated with the heat exchange air pipe.

9. The low-water-powder polyester pelletizing and drying system according to claim 8, characterized in that: The hot air blowing pipe and the transverse air supply pipe are both equipped with regulating valves.

10. The low-water-powder polyester pelletizing and drying system according to claim 6, characterized in that: The system also includes a filter II, a circulation pump and a heat exchanger. The circulating water in the desalted water pool is transported to the feed port of the pelletizer and the starting end of the feeding channel through the filter II and the heat exchanger under the action of the circulation pump.

Images