Environment-friendly double-screw underwater granulation system

Abstract

The utility model relates to an environment-friendly double-screw underwater granulation system which comprises a double-screw extruder, an underwater granulator, a granulation water circulation device, a centrifugal dryer and a vibration drying device, and a circulation cooling system is arranged on the outer side wall of the double-screw extruder. The circulating cooling system comprises a circulating water sleeve arranged on the outer side wall of the double-screw extruder, a water inlet and a water outlet, the water inlet and the water outlet are formed in the two ends of the circulating water sleeve respectively, a plate heat exchanger is arranged on the water outlet for liquid-gas heat exchange, and water cooled by the plate heat exchanger enters a water tower. Hot air heated by the plate heat exchanger enters the vibration drying device, and the water inlet is communicated with the water tower. The double-screw extruder is cooled through water circulation, the water outlet of the double-screw extruder is communicated with the plate heat exchanger, heated cooling water provides heat, liquid-gas heat exchange is carried out through the plate heat exchanger, air is heated, the heated air is fed into the vibration drying device, and energy consumption of the vibration drying device is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of polymer material processing equipment, specifically relating to an environmentally friendly twin-screw underwater granulation system. Background Technology

[0002] The underwater twin-screw extruder is a high-efficiency plastics processing equipment, mainly used for the mixing, plasticizing, extrusion granulation, and molding of polymer materials. Its core feature lies in the efficient material conveying, mixing, and shearing achieved through the synergistic action of the twin screws, combined with underwater pelletizing technology to ensure the quality of pellet formation.

[0003] Utility model publication CN201056040Y discloses an underwater granulation system for styrene-butadiene resin hot melt. A hot melt pressure-lifting device is installed downstream of a twin-screw extruder to achieve underwater pelletizing of the hot melt, thereby increasing output. Currently, water cooling is commonly used to cool twin-screw extruders to prevent material degradation due to excessive temperature. The cooling water is heated after passing through the extruder, carrying away a large amount of heat. Sometimes, water towers are even needed to continuously circulate and cool the cooling water, undoubtedly causing heat loss. Furthermore, hot air is required for heating and drying the product during the subsequent vibration drying process. If the heat from the cooling water could be effectively utilized in the vibration drying process, the heat required for vibration drying could be significantly reduced. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an environmentally friendly twin-screw underwater granulation system that effectively utilizes the heat of the circulating cooling system and uses this heat for the vibration drying process, thereby reducing the overall energy consumption of the machine.

[0005] The technical solution adopted in this utility model is:

[0006] An environmentally friendly twin-screw underwater granulation system includes a twin-screw extruder, an underwater granulator, a granulation water circulation device, a centrifugal dryer, and a vibration drying device. A circulating cooling system is provided on the outer wall of the twin-screw extruder. The circulating cooling system includes a circulating water sleeve installed on the outer wall of the twin-screw extruder, and inlets and outlets respectively located at both ends of the circulating water sleeve. A plate heat exchanger is installed at the outlet for liquid-gas heat exchange. The water cooled by the plate heat exchanger enters a water tower, and the hot air heated by the plate heat exchanger enters the vibration drying device. The inlet is connected to the water tower.

[0007] Furthermore, it also includes an exhaust gas filtration and dust removal system, which includes a dust removal box and a purification box connected in sequence by pipelines. The exhaust pipe of the purification box is connected to the vibrating drying device. An exhaust port is provided on the twin-screw extruder, and the dust removal box is connected to the exhaust port.

[0008] Furthermore, the dust collection box includes a box body and several filter screens disposed inside the box body, with the mesh size of the filter screens gradually decreasing along the gas movement direction.

[0009] Furthermore, there are sliding grooves on both the upper and lower sides of the box, and the upper and lower ends of the filter screen are set in the corresponding sliding grooves. There is a cabinet door on one side of the box.

[0010] Furthermore, a sealing device adapted to the filter screen is provided on the inner wall of the cabinet door. The sealing device includes sealing strips arranged opposite each other on the left and right, a push plate arranged between the two sealing strips, and a spring arranged between the push plate and the cabinet door.

[0011] Furthermore, the cabinet door and the cabinet body are connected by a locking buckle.

[0012] Furthermore, activated carbon is filled inside the purification chamber.

[0013] Furthermore, the vibration drying device includes a vibration dryer, an air heater, and a circulating fan. The top of the vibration dryer is connected to the air inlet of the circulating fan through pipe A, and the air outlet of the circulating fan is connected to the bottom of the vibration dryer through pipe B. An air heater is installed on pipe B, and a four-way valve is installed on pipe A. The gas discharged from the purification box and the hot air heated by the plate heat exchanger enter the pipe A through the four-way valve.

[0014] The positive effects of this utility model are:

[0015] This invention features a circulating cooling system installed on the outer wall of a twin-screw extruder. Water circulation is used to cool the twin-screw extruder. The water outlet is connected to a plate heat exchanger, where heated cooling water provides heat. This heat exchanger facilitates liquid-gas heat exchange, heating the air. The heated air is then sent into a vibrating drying device, reducing the energy consumption of the vibrating drying device. Simultaneously, the circulating water is cooled after passing through the plate heat exchanger and then flows back into the water tower, reducing the cooling requirements of the water tower and achieving heat reuse, thus lowering the overall energy consumption of the machine. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the present invention;

[0017] Figure 2 This is a schematic diagram of the exhaust gas filtration and dust removal system of this utility model;

[0018] Figure 3 This is a schematic diagram of the dust collector box of this utility model;

[0019] Figure 4 This is a schematic diagram of the vibration drying device of this utility model. Detailed Implementation

[0020] As attached Figure 1-4 As shown, this utility model discloses an environmentally friendly twin-screw underwater granulation system that can recover and utilize the heat in the circulating cooling system and use it in the vibration drying device. On the one hand, it can reduce the heat required by the vibration drying device, and on the other hand, it can reduce the cooling pressure of the water tower, thereby reducing the overall energy consumption of the machine.

[0021] The overall structure of this utility model is similar to that described in utility model publication CN201056040Y, both including a twin-screw extruder 1, an underwater granulator 2, a granulation water circulation device 3, a centrifugal dryer 5, and a vibrating dryer 4. An improved circulating cooling system is added. The circulating cooling system includes a circulating water sleeve 19 mounted on the outer wall of the twin-screw extruder 1, an inlet and an outlet at both ends of the circulating water sleeve 19. The outlet is connected to a plate heat exchanger 17, which is connected to a water tower 18. Circulating water passing through the plate heat exchanger 17 enters the water tower 18, which is connected to the inlet to achieve a closed loop. The circulating water heated by the twin-screw extruder 1 enters the plate heat exchanger 17 for liquid-gas heat exchange, achieving cooling of the circulating water and heating of the gas. The heated gas enters the vibrating dryer 4, and the cooled circulating water enters the water tower 18.

[0022] Furthermore, this utility model also includes a waste gas filtration and dust removal system 6, comprising a dust removal box 9 connected to the air outlet 7 via an air inlet pipe 15 and a purification box 10 connected to the dust removal box 9. The waste gas, after dust removal and purification, enters the vibration drying device 4. Since the waste gas discharged from the twin-screw extruder 1 also has a certain amount of heat, sending this part of the gas into the vibration drying device after dust removal and purification can further reduce the energy consumption of the vibration drying device.

[0023] The dust collector 9 includes a housing and several filters 11 disposed within the housing. In this embodiment, there are two filters 11, and the mesh size of the filters 11 gradually decreases along the gas flow direction, enabling graded filtration of dust and resulting in a more thorough filtration effect. To facilitate the installation and removal of the filters 11, a cabinet door 12 is provided on one side of the housing. Sliding grooves are provided on both the upper and lower surfaces inside the housing. The upper and lower ends of the filters 11 are positioned within the corresponding sliding grooves. Opening the cabinet door 12 allows the filters 11 to be pulled out for cleaning or replacement.

[0024] Preferably, a sealing device that cooperates with the filter screen 11 is provided on the inner wall of the cabinet door 12 to improve the sealing degree between the filter screen 11 and the left and right sides of the cabinet body, ensuring the filtration effect. The sealing device includes sealing strips 13 fixedly installed on the cabinet door 12 and arranged opposite each other. The distance between the two sealing strips 13 corresponds to the thickness of the filter screen 11. When the cabinet door 12 is closed, the edge of the filter screen 11 is locked between the two sealing strips 13. At the same time, a push plate 14 is provided between the two sealing strips 13 via a spring. The spring is located between the push plate 14 and the cabinet door 12. When the cabinet door 12 is closed, the spring is compressed, providing an inward force to the filter screen 11, which can keep the filter screen 11 tightly against the other side of the cabinet body, reducing the gaps around the filter screen 11 and achieving full filtration of exhaust gas. The door 12 and the cabinet body can be connected by a quick-locking buckle to realize the quick opening or locking of the cabinet door 12.

[0025] The purification chamber 10 is filled with activated carbon, which is used to purify the waste gas through adsorption, thereby reducing the pollutant content and pollution to a certain extent.

[0026] The structure of the vibration drying device 4 is consistent with that described in the utility model CN201056040Y, including a vibration dryer 401, an air heater 406, and a circulating fan 403. The top of the vibration dryer 401 is connected to the air inlet of the circulating fan 403 via pipe A402, and the air outlet of the circulating fan 403 is connected to the bottom of the vibration dryer 401 via pipe B404. The air heater 406 is installed on pipe B404. A four-way valve 405 is provided on pipe A402. Gas heated by the plate heat exchanger 17 and gas discharged from the purification box 10 enter pipe A402 through the four-way valve 405. After being reheated by the air heater 406, it enters the vibration dryer 401. Since the air supplied to pipe A402 has a certain amount of heat, the heating requirement of the air heater 406 can be effectively reduced, its energy consumption can be reduced, and waste heat and waste gas can be reused.

[0027] This invention achieves cooling of the return cooling water by adding a circulating cooling system, and at the same time recovers and utilizes its heat in the vibration drying device. This not only reduces the heating demand of the air heater 406 and its energy consumption, but also reduces the cooling pressure of the water tower. Furthermore, the exhaust gas filtration and dust removal system purifies and removes the hot exhaust gas discharged from the exhaust port 7 and reuses it in the vibration drying device, which can also replenish the hot air and reduce energy consumption.

[0028] This invention reduces the energy consumption of the entire machine through various methods and treats the exhaust gas to prevent air pollution, making the whole device more environmentally friendly.

[0029] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An environmentally friendly twin-screw underwater granulation system, comprising a twin-screw extruder (1), an underwater granulator (2), a granulation water circulation device (3), a centrifugal dryer (5), and a vibration drying device (4), characterized in that... A circulating cooling system is provided on the outer wall of the twin-screw extruder (1). The circulating cooling system includes a circulating water sleeve (19) provided on the outer wall of the twin-screw extruder (1), an inlet and an outlet respectively provided at both ends of the circulating water sleeve (19), a plate heat exchanger (17) provided on the outlet for liquid-gas heat exchange, water cooled by the plate heat exchanger (17) enters the water tower (18), and hot air heated by the plate heat exchanger (17) enters the vibration drying device (4). The inlet is connected to the water tower (18). It also includes a waste gas filtration and dust removal system (6). The waste gas filtration and dust removal system (6) includes a dust removal box (9) and a purification box (10) connected in sequence by pipelines. The air outlet of the purification box (10) is connected to the vibration drying device (4). An air outlet (7) is provided on the twin-screw extruder (1), and the dust removal box (9) is connected to the air outlet (7).

2. The environmentally friendly twin-screw underwater granulation system according to claim 1, characterized in that... The dust collector (9) includes a box body and several filter screens (11) installed inside the box body. Along the gas movement direction, the filter screen holes of the several filter screens (11) gradually decrease.

3. The environmentally friendly twin-screw underwater granulation system according to claim 2, characterized in that... The upper and lower sides of the box are provided with sliding grooves, and the upper and lower ends of the filter screen (11) are set in the corresponding sliding grooves. A cabinet door (12) is provided on one side of the box.

4. The environmentally friendly twin-screw underwater granulation system according to claim 3, characterized in that... A sealing device adapted to the filter screen (11) is provided on the inner side wall of the cabinet door (12). The sealing device includes sealing strips (13) arranged opposite to each other on the left and right, a push plate (14) arranged between the two sealing strips (13), and a spring arranged between the push plate (14) and the cabinet door (12).

5. An environmentally friendly twin-screw underwater granulation system according to claim 3 or 4, characterized in that... The cabinet door (12) is connected to the cabinet body by a locking buckle.

6. The environmentally friendly twin-screw underwater granulation system according to claim 1, characterized in that... The purification box (10) is filled with activated carbon.

7. The environmentally friendly twin-screw underwater granulation system according to claim 1, characterized in that... The vibration drying device (4) includes a vibration dryer (401), an air heater (406), and a circulating fan (403). The top of the vibration dryer (401) is connected to the air inlet of the circulating fan (403) through pipe A (402). The air outlet of the circulating fan (403) is connected to the bottom of the vibration dryer (401) through pipe B (404). An air heater (406) is provided on pipe B (404). A four-way valve (405) is provided on pipe A (402). The gas discharged from the purification box (10) and the hot air heated by the plate heat exchanger (17) enter the pipe A (402) through the four-way valve (405).

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