1. An optimized polypropylene underwater pelletizing system is characterized in that: comprises a granulating water pump (1), a heat exchanger (2), a granulator (3), a buffering and purifying device (4), a centrifugal drier (5) and a granulating water tank (6);

an outlet of the granulating water pump (1) is connected to a hot material flow inlet of the heat exchanger (2), a hot material flow outlet of the heat exchanger (2) is connected to a granulating water inlet of the granulator (3), an outlet of the granulator (3) is divided into two paths, one path is connected to a buffering and purifying device (4) for purifying and deodorizing polypropylene granules, and then is connected to solid-liquid separation equipment through a pipeline, the other path is directly connected to a pipeline between the buffering and purifying device (4) and the solid-liquid separation equipment and is provided with a gate valve, a liquid phase outlet of the solid-liquid separation equipment is connected to a granulating water pool (6), the granulating water pool (6) is connected to the granulating water pump (1), and the granulating water pool (6) is also provided with a granulating water replenishing pipeline for replenishing fresh granulating water;

the buffering and purifying device (4) is also provided with a steam inlet pipeline connected with a public engineering steam pipeline, the steam inlet pipeline is also provided with a regulating valve, the buffering and purifying device is also provided with a thermometer, and the regulating form of the thermometer and the regulating valve is PID regulation.

2. The optimized polypropylene underwater pelletizing system of claim 1, wherein: the solid-liquid separation equipment is a centrifugal drier (5).

3. The optimized polypropylene underwater pelletizing system of claim 1, wherein: the buffer purification device (4) is tank-shaped equipment, the top of the tank body is provided with an upper end enclosure A (4.1.1), the upper part of the tank body is also provided with a granulating water inlet A (4.1.2), the bottom of the tank body is provided with a steam inlet A (4.1.3), the bottom surface of the tank body is provided with a material outlet, and the material outlet is connected to solid-liquid separation equipment in parallel;

the spiral flow guide spiral belt A (4.1.5) used for guiding granulating water is arranged on the inner wall of the tank body from top to bottom, the flow guide spiral belt side wall is arranged on the edge of a flow channel close to a central shaft in the tank body along the flow guide spiral belt A (4.1.5), the center of the tank body is also provided with a pull rod A (4.1.4), the pull rod A (4.1.4) is fixedly connected with the flow guide spiral belt A (4.1.5) through a connecting rod A (4.1.6), the bottom of the inner wall of the tank body is also provided with a section of baffle plate used for supporting the flow guide spiral belt A (4.1.5), and the width of the baffle plate is equal to that of the flow guide spiral belt A (4.1.5).

4. The optimized polypropylene underwater pelletizing system of claim 3, wherein: the granulating water inlet A (4.1.2) and the steam inlet A (4.1.3) are connected to the tank body of the buffering and purifying device (4) from the tangential direction.

5. The optimized polypropylene underwater pelletizing system of claim 1, wherein: the buffering and purifying device (4) is a tank-shaped device, the top of the tank body is provided with an upper end enclosure B (4.2.1), and the tank body is provided with a granulating water inlet B (4.2.2) and a steam inlet B (4.2.3);

the inner wall of the tank body is provided with a spiral diversion spiral belt B (4.2.8) which is used for guiding granulating water from top to bottom, one side of the diversion spiral belt B (4.2.8) close to the middle shaft of the tank body is also fixedly connected with an inner cylinder B (4.2.7) from top to bottom, the bottom of the inner wall of the tank body is also provided with a section of baffle plate used for supporting the diversion spiral belt B (4.2.8), and the width of the baffle plate is equal to the width of the diversion spiral belt B (4.2.8);

a pull rod B (4.2.4) is further arranged at the middle shaft in the tank body, a connecting ring B (4.2.6) is fixedly sleeved on the pull rod B (4.2.4), the connecting ring B (4.2.6) is fixedly connected with the inner cylinder B (4.2.7), and a fan-shaped hollow area is arranged on the connecting ring B (4.2.6);

a funnel-shaped collector B (4.2.5) is also fixed at the bottom of the inner wall of the inner cylinder B (4.2.7), and the bottom of the collector B (4.2.5) is a material outlet and is connected to solid-liquid separation equipment.

6. The optimized polypropylene underwater pelletizing system of claim 5, wherein: the grain cutting water inlet B (4.2.2) and the steam inlet B (4.2.3) are connected to the tank body from the tangential direction of the tank body.

7. The optimized polypropylene underwater pelletizing system of claim 1, wherein: buffering purifier (4) including the solid-liquid phase primary separation device and the buffering purifying tank that will cut grain water and polypropylene aggregate part separation, the import of solid-liquid phase primary separation device is cut grain water inlet C (4.3.2) and is linked to each other with the export of pelleter (3) promptly, solid-liquid phase primary separation device has two way exports, carry one way of cutting grain water and polypropylene aggregate mixture to pass through the pipeline and link to the buffering purifying tank, and steam inlet C (4.3.3) also link on the pipeline of carrying cutting grain water and polypropylene aggregate mixture, carry the material export of cutting grain water even to the buffering purifying tank all the way.

8. The optimized polypropylene underwater pelletizing system of claim 7 wherein: the inside screen cloth C (4.3.4) that will partly cut grain water separation and come out that is equipped with to one side of solid-liquid phase primary separation device, screen cloth C's aperture is less than the particle diameter of polypropylene granule, the screen cloth lower part is equipped with the export of carrying and cuts grain water, and the material export of parallel connection toward the buffering purification tank, the lower one end upper portion of screen cloth is equipped with the export of carrying and cutting grain water and polypropylene granule mixture.

9. The optimized polypropylene underwater pelletizing system of claim 8, wherein: the top of the buffer purification tank is an upper end enclosure C (4.3.1), the inner wall of the buffer purification tank is provided with a spiral flow guide spiral belt C (4.3.6) used for guiding the granulating water from top to bottom, one side of the flow guide spiral belt C (4.3.6) close to the central axis of the tank body is also fixedly connected with an inner cylinder C (4.3.7) from top to bottom, the bottom cylinder wall of the inner cylinder C (4.3.7) is provided with an opening and is connected with a pipeline for conveying the granulating water and polypropylene granule mixture at the outlet of the solid-liquid phase primary separation device, a spiral conveying device (4.3.8) is further arranged inside the inner cylinder C (4.3.7), and the top of the buffer purification tank is further provided with a motor for driving the spiral conveying device (4.3.8); and a material outlet is arranged on the bottom surface of the buffer purification tank, and the position of the material outlet on the bottom surface of the buffer purification tank is outside the circular area corresponding to the inner cylinder C.

10. The optimized polypropylene underwater pelletizing system of claim 7 wherein: the direction of the opening arranged on the bottom cylinder wall of the inner cylinder C (4.3.7) is the tangential direction of the inner cylinder C (4.3.7).

Background

After the polypropylene (PP) is produced and granulated, peculiar smell is often accompanied, and the VOCS generally reaches the standard, so that manufacturers often do not care about the treatment of PP granules, but in fact, the PP granules need to be purified and deodorized for the physical and mental health of workers and increasing the trust of downstream customers.

Through research, the possible cause of the peculiar smell generated by the PP granules is mainly hydrocarbon and sulfide carried in the PP granules. Although the purity of the refined propylene is more than 99.5 percent, the refined propylene also contains impurities such as propane and the like, the impurities enter a propylene recovery unit and a subsequent unit from a polymerization unit, if the treatment is not thorough, the impurities are entrained in PP powder, in addition, if the content of sulfide in the propylene raw material used by the device is high, the performance and the service life of a desulfurizing agent are not improved in a matching way in the continuous production capacity improving process, residual vulcanizing agent can enter a polymerization reactor, and then enter the subsequent unit and is finally entrained in granules, so that the powder generates peculiar smell.

Disclosure of Invention

In order to solve the problems in the background art, the invention provides an optimized polypropylene underwater pelletizing system.

An optimized polypropylene underwater pelletizing system comprises a pelletizing water pump, a heat exchanger, a pelletizer, a buffering and purifying device, a centrifugal drier and a pelletizing water tank;

the outlet of the granulating water pump is connected to the hot material inlet of the heat exchanger, the hot material outlet of the heat exchanger is connected to the granulating water inlet of the granulator, the cold material inlet of the heat exchanger and the cold material outlet of the heat exchanger are cooling water or chilled water, the outlet of the granulator is divided into two paths, one path is connected to a buffering and purifying device for purifying and deodorizing polypropylene granules, a gate valve is arranged, the other path is connected to solid-liquid separation equipment through a pipeline, the other path is directly connected to the pipeline between the buffering and purifying device and the solid-liquid separation equipment, the gate valve is arranged, the liquid phase outlet of the solid-liquid separation equipment is connected to a granulating water pool for storing granulating water, the granulating water pool is connected to a granulating water pump, and the granulating water pool is also provided with a granulating water replenishing pipe for replenishing fresh granulating water; the process can be flexibly switched between the inlet buffering purification device and the non-inlet buffering purification device by arranging the two gate valves;

the buffering and purifying device is also provided with a steam inlet pipeline connected with a public engineering steam pipeline, the steam inlet pipeline is also provided with a regulating valve, the buffering and purifying device is also provided with a thermometer, and the regulating form of the thermometer and the regulating valve is PID regulation.

Further, the solid-liquid separation equipment is a centrifugal dryer.

Furthermore, the buffering and purifying device is a tank-shaped device, the top of the tank body is provided with an upper end enclosure A, the upper part of the tank body is also provided with a granulating water inlet A, the bottom of the tank body is provided with a steam inlet A, the bottom surface of the tank body is provided with a material outlet, and the material outlet is connected with a solid-liquid separation device;

the spiral guide spiral belt A used for guiding the granulated water is arranged on the inner wall of the tank body from top to bottom, a guide spiral belt side wall is arranged at the edge of a runner, close to a central shaft in the tank body, along the guide spiral belt A, a pull rod A is further arranged at the center of the tank body, the pull rod A is fixedly connected with the guide spiral belt A through a connecting rod A, a section of baffle used for supporting the guide spiral belt A is further arranged at the bottom of the inner wall of the tank body, and the width of the baffle is equal to that of the guide spiral belt A.

Further, the granulating water inlet A and the steam inlet A are connected to the tank body of the buffering and purifying device from the tangential direction.

Furthermore, the buffering and purifying device is a tank-shaped device, the top of the tank body is provided with an upper end enclosure B, and the tank body is provided with a granulating water inlet B and a steam inlet B;

the inner wall of the tank body is provided with a spiral diversion spiral belt B from top to bottom for guiding granulating water, one side of the diversion spiral belt B, which is close to the central axis of the tank body, is also fixedly connected with an inner cylinder B from top to bottom, the bottom of the inner wall of the tank body is also provided with a section of baffle for supporting the diversion spiral belt B4.2.8, and the width of the baffle is equal to the width of the diversion spiral belt B4.2.8;

a pull rod B is further arranged at the middle shaft in the tank body, a connecting ring B is fixedly sleeved on the pull rod B and fixedly connected with the inner cylinder B, and a fan-shaped hollow area is arranged on the connecting ring B4.2.6;

a funnel-shaped collector B is also fixed at the bottom of the inner wall of the inner cylinder B, and the bottom of the collector B (4.2.5) is a material outlet and is connected to solid-liquid separation equipment.

Furthermore, the grain cutting water inlet B and the steam inlet B are connected to the tank body from the tangential direction of the tank body.

Further, buffering purifier include solid-liquid phase primary separation device and the buffering purifying tank that will cut grain water and polypropylene granule part separation, solid-liquid phase primary separation device's import is cut grain water inlet C promptly and is linked to each other with the export of pelleter, solid-liquid phase primary separation device has two ways exports, carry one way of cutting grain water and polypropylene granule mixture to pass through the pipeline and link to the buffering purifying tank, and steam inlet C also links on the pipeline of carrying cutting grain water and polypropylene granule mixture, carry one way of cutting grain water and link to the material outlet of buffering purifying tank.

Further, the inside screen cloth C that separates out with partial eager grain water that is equipped with to one side of solid-liquid phase primary separation device, screen cloth C's aperture is less than the particle diameter of polypropylene granule, the screen cloth lower part is equipped with the export of carrying eager grain water, and the material export of parallel connection toward the buffering purifying tank, the lower one end upper portion of screen cloth is equipped with the export of carrying eager grain water and polypropylene granule mixture.

Furthermore, the top of the buffering and purifying tank is provided with an upper end enclosure C, the inner wall of the buffering and purifying tank is provided with a spiral flow guide spiral ribbon C from top to bottom for guiding the granulated water, one side of the flow guide spiral ribbon C, which is close to the central axis of the tank body, is also fixedly connected with an inner cylinder C from top to bottom, the bottom cylinder wall of the inner cylinder C is provided with an opening and is connected with a pipeline for conveying the granulated water and the polypropylene granule mixture at the outlet of the solid-liquid phase primary separation device, a spiral conveying device is also arranged inside the inner cylinder C, and the top of the buffering and purifying tank is also provided with a motor for driving the spiral conveying device; and a material outlet is arranged on the bottom surface of the buffer purification tank, and the position of the material outlet on the bottom surface of the buffer purification tank is outside the circular area corresponding to the inner cylinder C.

Further, the direction of the opening formed in the bottom cylinder wall of the inner cylinder C is the tangential direction of the inner cylinder C.

Compared with the prior art, the technical scheme disclosed by the invention has the following beneficial effects: the buffering and purifying device is used, steam is introduced into the buffering and purifying device, the water temperature is controlled to be 80 ℃, the retention time of materials is 2min, so that hydrocarbon and sulfide impurities carried by polypropylene granules are fully taken away by hot steam and hot granulated water, and the problem that the polypropylene granules have peculiar smell in the prior art is solved.

Drawings

FIG. 1: an optimized polypropylene underwater pelletizing system schematic diagram.

FIG. 2: schematic diagram of the buffer purification apparatus in example 1.

FIG. 3: schematic diagram of the buffer purification apparatus in example 2.

FIG. 4: schematic diagram of the buffer purification apparatus in example 3.

In the figure: 1. the device comprises a granulating water pump, a heat exchanger, a granulator, a buffering and purifying device, a centrifugal drier, a granulating water tank, a connecting rod A, a granulating water inlet A, a steam inlet A, a pulling rod A, a steam inlet B, a pulling rod B, a granulating water inlet B, a steam inlet B, a pulling rod C, a collector B, a 4.2.6, a connecting ring B, a 4.2.7, an inner cylinder B, a guiding water belt B, a guiding water inlet C, a steam inlet C, a filtering screen C, a filter B, a.

Detailed Description

The following description is of specific embodiments of the present invention, and the disclosed embodiments are intended to be illustrative rather than restrictive, and all changes that come within the meaning and range of equivalency of the claims are intended to be embraced therein.

Example 1

As shown in fig. 1 and 2, an optimized polypropylene underwater pelletizing system comprises a pelletizing water pump 1, a heat exchanger 2, a pelletizer 3, a buffering and purifying device 4, a centrifugal dryer 5 and a pelletizing water tank 6;

an outlet of the granulating water pump 1 is connected to a hot material inlet of the heat exchanger 2, a hot material outlet of the heat exchanger 2 is connected to a granulating water inlet of the granulator 3, an outlet of the granulator 3 is divided into two paths, one path is connected to a buffering and purifying device 4 for purifying and deodorizing polypropylene granules, then is connected to solid-liquid separation equipment through a pipeline, the other path is directly connected to a pipeline between the buffering and purifying device 4 and the solid-liquid separation equipment, a gate valve is arranged, a liquid phase outlet of the solid-liquid separation equipment is connected to a granulating water pool 6, the granulating water pool 6 is connected to the granulating water pump 1, and the granulating water pool 6 is also provided with a granulating water supplementing pipeline (not shown) for supplementing fresh granulating water;

the buffering and purifying device 4 is also provided with a steam inlet pipeline connected with a public engineering steam pipeline, the steam inlet pipeline is also provided with a regulating valve, the buffering and purifying device is also provided with a thermometer, and the regulating form of the thermometer and the regulating valve is PID regulation.

The solid-liquid separation equipment is a centrifugal drier 5.

The buffer purification device 4 is a tank-shaped device, the top of the tank body is an upper end enclosure A4.1.1, the upper part of the tank body is also provided with a granulating water inlet A4.1.2, the bottom of the tank body is provided with a steam inlet A4.1.3, the bottom surface of the tank body is provided with a material outlet, and the material outlet is connected with a solid-liquid separation device; the temperature meter on the buffering and purifying device is arranged at the bottom of the tank body, and the temperature of the granulating water at the bottom of the tank body is monitored.

The inner wall of the tank body is provided with a spiral diversion spiral belt A4.1.5 used for guiding granulating water from top to bottom, the edge of a flow channel close to a central shaft in the tank body along the diversion spiral belt A4.1.5 is provided with a diversion spiral belt side wall, the center of the tank body is also provided with a pull rod A4.1.4, the pull rod A4.1.4 is fixedly connected with the diversion spiral belt A4.1.5 through a connecting rod A4.1.6, the bottom of the inner wall of the tank body is also provided with a section of baffle used for supporting the diversion spiral belt A4.1.5, and the width of the baffle is equal to the width of the diversion spiral belt A4.1.5.

The granulating water inlet A4.1.2 and the steam inlet A4.1.3 are connected to the tank body of the buffer purification device 4 from the tangential direction.

In actual use, the pellet water mixed with the polypropylene pellets flows in from the pellet water inlet A4.1.2 and then flows down the guide screw belt A4.1.5, and the steam flows in through the steam inlet A4.1.3.

When the sausage blockage occurs in the buffering and purifying device, after cooling, the sausage material shrinks, the upper sealing head A4.1.1 is removed, the pull rod A4.1.4 is pulled out through the portal frame, the pull rod A4.1.4 and the diversion ribbon A4.1.5 are integrated, so that the diversion ribbon A4.1.5 is also pulled out together, the standby pull rod A4.1.4 and the diversion ribbon A4.1.5 are inserted quickly, the upper sealing head A4.1.1 is covered again, and the process operation can be recovered quickly.

Example 2

As shown in fig. 1 and 3, an optimized polypropylene underwater pelletizing system comprises a pelletizing water pump 1, a heat exchanger 2, a pelletizer 3, a buffering and purifying device 4, a centrifugal dryer 5 and a pelletizing water tank 6;

an outlet of the granulating water pump 1 is connected to a hot material inlet of the heat exchanger 2, a hot material outlet of the heat exchanger 2 is connected to a granulating water inlet of the granulator 3, an outlet of the granulator 3 is divided into two paths, one path is connected to a buffering and purifying device 4 for purifying and deodorizing polypropylene granules, then the other path is connected to solid-liquid separation equipment through a pipeline, the other path is directly connected to a pipeline between the buffering and purifying device 4 and the solid-liquid separation equipment and is provided with a gate valve, a liquid phase outlet of the solid-liquid separation equipment is connected to a granulating water tank 6, the granulating water tank 6 is connected to the granulating water pump 1, and the granulating water tank 6 is also provided with a granulating water supplementing pipeline for supplementing fresh granulating water;

the buffering and purifying device 4 is also provided with a steam inlet pipeline connected with a public engineering steam pipeline, the steam inlet pipeline is also provided with a regulating valve, the buffering and purifying device is also provided with a thermometer, and the regulating form of the thermometer and the regulating valve is PID regulation.

The solid-liquid separation equipment is a centrifugal drier 5.

The buffer purification device 4 is a tank-shaped device, the top of the tank body is an upper end enclosure B4.2.1, and the tank body is provided with a granulating water inlet B4.2.2 and a steam inlet B4.2.3;

the inner wall of the tank body is provided with a spiral diversion spiral belt B4.2.8 from top to bottom for guiding the granulating water, one side of the diversion spiral belt B4.2.8 close to the central axis of the tank body is fixedly connected with an inner cylinder B4.2.7 from top to bottom, the bottom of the inner wall of the tank body is also provided with a section of baffle plate for supporting the diversion spiral belt B4.2.8, and the width of the baffle plate is equal to the width of the diversion spiral belt B4.2.8;

a pull rod B4.2.4 is further arranged at the center shaft in the tank body, a connecting ring B4.2.6 is fixedly sleeved on the pull rod B4.2.4, the connecting ring B4.2.6 is fixedly connected with the inner cylinder B4.2.7, and a fan-shaped hollow area is arranged on the connecting ring B4.2.6;

a funnel-shaped collector B4.2.5 is fixed at the bottom of the inner wall of the inner cylinder B4.2.7, and the bottom of the collector B4.2.5 is a material outlet and is connected to solid-liquid separation equipment.

The granulating water inlet B4.2.2 and the steam inlet B4.2.3 are connected to the tank body from the tangential direction of the tank body.

In actual use, the pellet water mixed with polypropylene pellets flows in from pellet water inlet B4.2.2, then due to the driving of the pump, the flow flows upwards along diversion screw belt B4.2.8, and the steam flows in through steam inlet B4.2.3, finally overflows the inside of inner cylinder B4.2.7, and then flows out from collector B4.2.5.

When the sausage blockage occurs in the buffering and purifying device, after cooling, the sausage material shrinks, the upper sealing head B4.2.1 is removed, the pull rod B4.2.4 is pulled out through the portal frame, and as the pull rod B4.2.4 is integrated with the diversion spiral ribbon B4.2.8 and the inner barrel B4.2.7, the diversion spiral ribbon B4.2.8 and the inner barrel B4.2.7 are also pulled out together, the standby pull rod B4.2.4, the diversion spiral ribbon B4.2.8 and the inner barrel B4.2.7 are inserted quickly, the upper sealing head B4.2.1 is covered again, and the process operation can be recovered quickly.

Example 3

As shown in fig. 1 and 4, an optimized polypropylene underwater pelletizing system comprises a pelletizing water pump 1, a heat exchanger 2, a pelletizer 3, a buffering and purifying device 4, a centrifugal dryer 5 and a pelletizing water tank 6;

an outlet of the granulating water pump 1 is connected to a hot material inlet of the heat exchanger 2, a hot material outlet of the heat exchanger 2 is connected to a granulating water inlet of the granulator 3, an outlet of the granulator 3 is divided into two paths, one path is connected to a buffering and purifying device 4 for purifying and deodorizing polypropylene granules, then the other path is connected to solid-liquid separation equipment through a pipeline, the other path is directly connected to a pipeline between the buffering and purifying device 4 and the solid-liquid separation equipment and is provided with a gate valve, a liquid phase outlet of the solid-liquid separation equipment is connected to a granulating water tank 6, the granulating water tank 6 is connected to the granulating water pump 1, and the granulating water tank 6 is also provided with a granulating water supplementing pipeline for supplementing fresh granulating water;

the buffering and purifying device 4 is also provided with a steam inlet pipeline connected with a public engineering steam pipeline, the steam inlet pipeline is also provided with a regulating valve, the buffering and purifying device is also provided with a thermometer, and the regulating form of the thermometer and the regulating valve is PID regulation.

The solid-liquid separation equipment is a centrifugal drier 5.

Buffering purifier 4 include solid-liquid phase primary separation device and the buffering purifying tank that will cut grain water and polypropylene granule part separation, solid-liquid phase primary separation device's import is cut grain water inlet C4.3.2 and is linked to each other with the export of pelleter 3 promptly, solid-liquid phase primary separation device has two ways exports, carry one way of cutting grain water and polypropylene granule mixture to pass through the pipeline and link to the buffering purifying tank, and steam inlet C4.3.3 also links on the pipeline of carrying cutting grain water and polypropylene granule mixture, carry the material export of cutting grain water even to the buffering purifying tank all the way.

The inside screen cloth C4.3.4 that will partly cut grain water separation and come out that is equipped with to one side of solid-liquid phase primary separation device, screen cloth C's aperture is less than the particle diameter of polypropylene granule, the screen cloth lower part is equipped with the export of carrying and cuts grain water to the material export of horizontal buffering purification jar, the lower one end upper portion of screen cloth is equipped with the export of carrying and cutting grain water and polypropylene granule mixture.

The top of the buffer purification tank is provided with an upper end enclosure C4.3.1, the inner wall of the buffer purification tank is provided with a spiral diversion spiral belt C4.3.6 used for guiding granulating water from top to bottom, one side of the diversion spiral belt C4.3.6, which is close to the central axis of the tank body, is also fixedly connected with an inner cylinder C4.3.7 from top to bottom, the bottom cylinder wall of the inner cylinder C4.3.7 is provided with an opening and is connected with a pipeline for conveying a granulating water and polypropylene granule mixture at the outlet of the solid-liquid phase primary separation device, a spiral conveying device 4.3.8 is also arranged inside the inner cylinder C4.3.7, and the top of the buffer purification tank is also provided with a motor used for driving the spiral conveying device 4.3.8; and a material outlet is arranged on the bottom surface of the buffer purification tank, and the position of the material outlet on the bottom surface of the buffer purification tank is outside the circular area corresponding to the inner cylinder C.

The direction of the opening formed in the bottom wall of the inner cylinder C4.3.7 is the tangential direction of the inner cylinder C4.3.7.

During the in-service use, the grain cutting water that mixes the polypropylene granule flows into from grain cutting water inlet C4.3.2 earlier, and screen cloth C4.3.4 that establishes to one side afterwards, and some grain cutting water directly leaks away, and some grain cutting water mixes with the polypropylene granule and steam, gets into inner tube C4.3.5, and is equipped with screw conveyor in the inner tube C4.3.5, and screw conveyor is unanimous with vertical screw feeder water pump principle, further promotes grain cutting water and polypropylene granule, finally overflows and goes out in the inner tube C4.3.5, descends along water conservancy diversion spiral shell area C4.3.6, finally flows out from the material export.

It can be foreseen that, with the structure of the buffering and purifying device in this embodiment, the amount of substances needing steam heating in the buffering and purifying tank can be reduced, and the materials can also exchange heat with newly entered materials at the diversion helical ribbon C4.3.6, so that the steam consumption is saved, further, because part of the granulated water is not heated, the temperature after mixing with the heated granulated water and polypropylene granule mixture is also correspondingly reduced, and therefore, when the heat exchanger 2 cools the granulated water, the required cold quantity is reduced, and energy saving and emission reduction are facilitated.