CN115854658A - A New Drying System for High Density Polyethylene Powder - Google Patents

Abstract

The invention relates to the field of polyethylene powder drying, in particular to a novel high-density polyethylene powder drying system, which includes a plurality of cyclone dust collectors for dedusting the steam tail gas flowing out of the dryer; A spray tower for cooling treatment of the steam tail gas; a drier, the drier includes a cylinder, a plurality of distribution plates are arranged longitudinally inside the cylinder, and an air inlet is arranged on the cylinder corresponding to each distribution plate and an air outlet; wherein, each of the air inlets communicates with the spray tower, and each of the air outlets communicates with each of the cyclone dust collectors. The new high-density polyethylene powder drying system provided by the invention can achieve the purpose of continuous operation, high thermal efficiency and high degree of automation of the system, and at the same time can solve the problems of large power consumption, easy material accumulation and dead zone.

Description

A New Drying System for High Density Polyethylene Powder

technical field

The invention relates to the field of polyethylene powder drying, in particular to a novel high-density polyethylene powder drying system.

Background technique

High Density Polyethylene (HDPE for short) is a non-polar thermoplastic resin with high crystallinity. The appearance of the original HDPE is milky white, and the thin section is translucent to a certain extent. PE has excellent resistance to most domestic and industrial chemicals.

High-density polyethylene has the advantages of high crystallinity, high strength, and high elongation, and can be used instead of engineering plastics. At present, the drying forms of high-density polyethylene powder mainly include airflow drying, fluidized bed drying and paddle drying.

Airflow drying is to add the slurry into the drying cylinder and mix it with hot air at a temperature of about 100-150°C and a flow rate of 10-30m/s, so that the slurry is dispersed into particles and moves with the hot air to dry.

The process of fluidized bed drying technology is that the bulk material is placed on the orifice plate, and the gas is conveyed from its lower part, causing the material particles to move on the gas distribution plate and suspended in the air flow, resulting in a mixed bottom layer of material particles and gas , like a liquid boiling.

The paddle dryer is a horizontal stirring continuous drying equipment mainly based on heat conduction. It is mainly composed of a cylinder with a jacket, a hollow paddle shaft and a driving device. Enter the jacket of the dryer shell and the inner cavity of the paddle shaft respectively, heat the inner wall of the dryer, the hollow blade, and the hollow shaft, and dry the material through heat conduction.

Airflow drying has defects such as low heat utilization rate, high power consumption, easy material accumulation and short drying time, while paddle drying has defects such as long residence time of bottom material and dead zone.

Contents of the invention

Aiming at the deficiencies in the above-mentioned prior art, the present invention provides a novel high-density polyethylene powder drying system to achieve the purpose of continuous operation, high thermal efficiency, and high degree of automation of the system, and at the same time to solve the problem of large power consumption and easy drying. The purpose of problems such as accumulation and dead zone.

In order to achieve the above object, the present invention provides the following technical solutions:

A novel high-density polyethylene powder drying system is characterized in that it includes:

A plurality of cyclone dust collectors for dedusting the steam tail gas flowing out of the dryer;

A spray tower for cooling the steam tail gas flowing out of the cyclone dust collector;

A drier, the drier includes a cylinder, a plurality of distribution discs are longitudinally arranged inside the cylinder, and an air inlet and an air outlet are arranged on the cylinder corresponding to each distribution disc;

Wherein, each of the air inlets communicates with the spray tower, and each of the air outlets communicates with each of the cyclone dust collectors.

Wherein, the distribution plate is a hollow structure and communicates with the air inlet, and the upper surface of the distribution plate is provided with a plurality of air holes.

Further, a baffle plate with a plurality of openings is provided on each distribution plate, and the multiple baffle plates divide the distribution plate into a plurality of small plates.

Furthermore, the small plate is provided with a discharge port, and no air hole is provided; a guide tube is further provided under the discharge port, and the guide tube is fixedly connected with the distribution plate.

Wherein, the dryer further includes a rotating shaft, the rotating shaft includes an outer casing and a rotating main shaft inside the outer casing, the rotating main shaft is connected with a conventional system, and the rotating main shaft is further connected with a plurality of rotating rakes Tooth connection.

Further, the plurality of rotating rake teeth are located above the distribution plate and matched with the baffle.

Wherein, an air distribution bag is provided between the dryer cylinder and the spray tower, and the plurality of air inlets are connected to one end of the air distribution bag.

Further, the other end of the sub-air bag is connected to a boost heater, and at the same time, the boost heater is connected to a circulating fan.

Furthermore, the circulation fan is connected to the top of the spray tower.

Wherein, a circulating water pump is connected to the bottom of the spray tower, and the circulating water pump is further connected to a primary cooler and a secondary cooler.

Wherein, the secondary cooler is further connected with a spray head, and the spray head extends into the spray tower and is located above the inside of the spray tower.

Wherein, a feed port is provided at the top of the dryer, and a discharge port is provided at the bottom of the dryer.

Compared with prior art, the advantages and beneficial effects that the present invention has are as follows:

The new high-density polyethylene powder drying system provided by the invention can run continuously, has high thermal efficiency, is easy to operate, has a high degree of automation, and occupies a small area, and is suitable for large-scale production; a single room of the system corresponds to a dust collector, which reduces interference and dust recovery The rate is high; the residence time of the material is evenly distributed, and the drying time is stable and reliable; the cooperation of the rake teeth and the baffle in the drying system is beneficial to the crushing of the lump material, making the fluidization easier, reducing the fluidization resistance and reducing the dead zone.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort.

Fig. 1 is the structural representation of drying system shown in the embodiment of the present invention;

Fig. 2 is a schematic diagram of a single distribution plate shown in an embodiment of the present invention;

in:

1 - dryer;

11 - barrel;

111-air inlet;

112-air outlet;

12 - distribution plate;

121 - baffle;

13 - guide tube;

14 - rotating spindle;

15 - Traditional system;

16 - rotating rake teeth;

17-feed inlet;

18-discharge port;

2- cyclone dust collector;

3-spray tower;

4- air distribution bag;

5- booster heater;

6-circulation fan;

7- circulating water pump;

8- primary cooler;

9- secondary cooler;

91 - Sprinkler head.

Detailed ways

The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments to further understand the purpose, solution and effect of the present invention, but it is not intended to limit the scope of protection of the appended claims of the present invention.

Some words are used to refer to specific components or components in the specification and subsequent claims, and those skilled in the art should understand that technical users or manufacturers may refer to the same component or component with different terms or terms. . This description and the following claims do not use the difference in name as a way to distinguish components or parts, but use the difference in function of components or parts as a criterion for distinguishing. "Includes" and "comprises" mentioned in the entire specification and subsequent claims are open-ended terms, so they should be interpreted as "including but not limited to". Otherwise, the term "connect" includes any direct and indirect means of electrical connection. Indirect means of electrical connection include connection through other means.

It should be noted that, in the description of the present invention, the terms "horizontal", "vertical", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientation or positional relationship or parameters indicated by "horizontal", "top", "bottom", "inside", "outside" and "about", or "approximately", "substantially", "left and right" are all based on The orientations or positional relationships shown in the drawings are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred devices or elements must have specific orientations, specific dimensions, or be constructed and operated in specific orientations , and therefore cannot be construed as a limitation of the present invention.

Referring to Figure 1-2, a new type of high-density polyethylene powder drying system, including:

A plurality of cyclone dust collectors 2 for dedusting the steam tail gas flowing out of the dryer; a spray tower 3 for cooling the steam tail gas flowing out of the cyclone dust collector 2; a dryer 1, the dryer 1 includes a cylinder 11, a plurality of distribution plates 12 are arranged longitudinally inside the cylinder 11, and an air inlet 111 and an air outlet 112 are arranged on the cylinder 11 corresponding to each distribution plate 12; wherein, each The air inlet 111 communicates with the spray tower 3 , and each of the air outlets 112 communicates with each of the cyclone dust collectors 2 . The new high-density polyethylene powder drying system provided by the embodiment of the present invention can operate continuously, has high thermal efficiency, is easy to operate, has a high degree of automation, and occupies a small area, and is suitable for large-scale production. A single room of the system corresponds to a dust collector, which reduces interference. The dust recovery rate is high.

In this embodiment, the distribution plate 12 is a hollow structure and communicates with the air inlet 111. The upper surface of the distribution plate 12 is provided with a plurality of air holes, and each of the distribution plates 12 has a plurality of openings. The baffle plate 121, the plurality of baffle plates 121 divide the distribution plate into a plurality of small plates, the small plate is provided with a feeding port, and no air hole; the lower part of the feeding port is further provided with a guide A tube 13, the guide tube 13 is fixedly connected with the distribution plate 12. In the embodiment of the present invention, the opening direction of the air holes on the distribution plate is set along the direction of material movement. The air flow suspends the solid particles and rotates from the inlet to the outlet. The material stays for a long time and the material drying time is stable and reliable.

In this embodiment, the dryer 1 further includes a rotating shaft, the rotating shaft includes an outer casing and a rotating main shaft 14 located inside the outer casing, the rotating main shaft 14 is connected with a conventional system 15, and the rotating main shaft 14 is further connected with a plurality of rotating tines 16 . Wherein, the plurality of rotating rake teeth 16 are located above the distribution plate 12 and are adapted to the baffle plate 121. Each rotating rake tooth 16 is composed of 4-8 groups of rake bars, and each rake bar is provided with several Each rake tooth rotates through the center of the opening of the baffle plate 121 and the distance between the edge of the rake tooth and the baffle plate is 5-10mm. In this embodiment, the cooperation of rake teeth and baffles in the drying system is beneficial to the crushing of lumpy materials, making fluidization easier, reducing fluidization resistance and reducing dead zones.

Wherein, an air distribution bag 4 is also provided between the dryer cylinder 11 and the spray tower 3, and the plurality of air inlets 111 are communicated with one end of the air distribution bag 4, and the air distribution bag 4 The other end is connected with a booster heater 5, and the booster heater 5 is connected with a circulation fan 6;

Wherein, a circulating water pump 7 is connected with the bottom of the spray tower 3, and the circulating water pump 7 is further connected with a primary cooler 8 and a secondary cooler 9, and the secondary cooler 9 is further connected with a spray head 91. The spray head 91 extends into the spray tower 3 and is located above the inside of the spray tower 3. A feed port 17 is provided at the top of the dryer 1, and a discharge port is provided at the bottom of the dryer. 18.

The dryer 1 in the new high-density polyethylene powder drying system provided by the embodiment of the present invention is a vertical rotary stirring fluidized dryer, and the dryer is equipped with a stirring spindle, a rake, a hot air distribution plate and a tongue-shaped hole. The jacket of dryer 1 is fed with saturated steam of 0.2-0.3 MPa. The top of each chamber of dryer 1 is provided with an air outlet 112 to connect with cyclone dust collector 2. After dust removal by cyclone dust collector 2, the tail gas enters spray tower 3 and passes through Circulating fan 6, booster heater 7 and gas distribution bag 8 return to the air chamber of each layer of hot air distribution plate 12 of dryer 1, and the circulating liquid at the bottom of spray tower 3 is pressurized by circulating water pump 7, and most of it passes through the primary cooler 8 returns to spray tower 3 to spray gas after heat exchange with secondary cooler 9, and a small part is discharged as waste water.

When the novel high-density polyethylene powder drying system provided by the embodiment of the present invention is in operation, the transmission system 15 starts to drive the rotating main shaft 14 of the dryer to rotate, and the material enters the uppermost distribution plate 12 of the dryer 1 through the feed port 17, and distributes The hot air is introduced into the disk 12 through the air inlet 111, and under the agitation of the rotating rake teeth 16, the material is fluidized in the small disk air chamber of the distribution disk 12, and the material is driven by the small disk airflow and the rotating rake teeth 16 along the The circular direction moves forward, and the rake teeth of the rotating rake teeth 16 just pass between the openings of the baffle plate 121. After each distribution disc 12 is dried, the material falls from the guide tube 13 to the next distribution disc 12, and finally passes through the opening of the baffle plate 121. The discharge port 18 is discharged.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention to other forms. Any skilled person who is familiar with this profession may use the technical content disclosed above to change or modify the equivalent of equivalent changes. The embodiments are applied to other fields, but any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still belong to the protection scope of the technical solutions of the present invention without departing from the content of the technical solutions of the present invention.

Claims (12)

1. A new type of high-density polyethylene powder drying system, including: A plurality of cyclone dust collectors for dedusting the steam tail gas flowing out of the dryer; A spray tower for cooling the steam tail gas flowing out of the cyclone dust collector; it is characterized in that: the drying system also includes: A drier, the drier includes a cylinder, a plurality of distribution discs are longitudinally arranged inside the cylinder, and an air inlet and an air outlet are arranged on the cylinder corresponding to each distribution disc; Wherein, each of the air inlets communicates with the spray tower, and each of the air outlets communicates with each of the cyclone dust collectors. 2. The drying system according to claim 1, characterized in that: the distribution plate is hollow and communicated with the air inlet, and the upper surface of the distribution plate is provided with a plurality of air holes. 3 . The drying system according to claim 2 , wherein a baffle plate with a plurality of openings is provided on each distribution plate, and the baffle plates divide the distribution plate into a plurality of small plates. 4 . 4. The drying system according to claim 3, characterized in that: the small plate is provided with a discharge port, and no air hole is provided; a guide tube is further provided below the discharge port, and the flow guide The cylinder is fixedly connected with the distribution plate. 5. The drying system according to claim 3, wherein the dryer further comprises a rotating shaft, the rotating shaft includes an outer casing and a rotating main shaft positioned inside the outer casing, the rotating main shaft is connected to a In connection with conventional systems, the rotating main shaft is further connected with a plurality of rotating rake teeth. 6 . The drying system according to claim 5 , wherein the plurality of rotating rake tines are located above the distribution plate and matched with the baffle. 7 . 7. The drying system according to claim 1, characterized in that: an air distribution bag is provided between the dryer cylinder and the spray tower, and the plurality of air inlets are connected to the air distribution bag. one end. 8. The drying system according to claim 7, characterized in that: the other end of the air distribution bag is connected to a booster heater, and at the same time, the booster heater is connected to a circulating fan. 9. The drying system according to claim 8, wherein the circulation fan is connected to the top of the spray tower. 10. The drying system according to claim 1, characterized in that: a circulating water pump is connected to the bottom of the spray tower, and the circulating water pump is further connected to a primary cooler and a secondary cooler. 11. The drying system according to claim 1, characterized in that: the secondary cooler is further connected with a spray head, and the spray head extends into the spray tower and is located above the inside of the spray tower. 12. The drying system according to claim 1, characterized in that: the top of the dryer is provided with a material inlet, and the bottom of the dryer is provided with a material outlet.

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