A slicing drying and THF removal tower

Abstract

The present invention relates to a slicing dryer and a THF removal tower, which comprises a tower body. A slicing feed inlet is provided at the center of the top of the tower body. A conical hopper is provided at the bottom of the tower body, and a slicing discharge outlet is provided at the lower end of the conical hopper. A plurality of positive conical distributing umbrella caps are arranged along the axis of the tower body. Above each distributing umbrella cap except the top-layer one and below the bottom-layer distributing umbrella cap, a baffle plate coaxial with it is respectively provided. Each baffle plate is in the shape of a flared mouth with a larger upper part and a smaller lower part; A tower body hot air inlet is provided at the lower part of the tower body, and a tower body hot air outlet is provided at the top of the tower body. The upper ends of each baffle plate are respectively connected to the inner wall of the tower body. Each baffle plate is a thin-walled cavity structure. The lower walls of each baffle plate are respectively connected to a baffle plate air supply ring pipe through a plurality of uniformly distributed radial connecting pipes. Each baffle plate air supply ring pipe surrounds the outer periphery of the tower body and is respectively provided with a baffle plate hot air interface. A plurality of baffle plate hot air holes are uniformly distributed on the upper wall of each baffle plate. This tower can enable the slices to be in full contact with the hot air flow, and thoroughly remove moisture and tetrahydrofuran.

Description

Technical Field

[0001] The present invention relates to a drying device, in particular to a slice drying and THF removal tower, belonging to the technical field of polyester production equipment. Background Art

[0002] In the existing production line, PBS type slices (polybutylene succinate) are usually dehydrated by a centrifuge or a vacuum rotary drum machine, which can only remove the moisture on the surface of the PBS type slices, so that the water content of the PBS type slices entering the intermediate bin is still relatively high. If directly packaged, it is easy to cause degradation. At the same time, a certain amount of tetrahydrofuran (THF) in the slices is likely to be gradually released after a period of time, and there are batch differences among the produced materials, which cannot achieve uniformity and affect the use grade of the products. Summary of the Invention

[0003] The purpose of the present invention is to overcome the problems existing in the prior art and provide a slice drying and THF removal tower, which can make the slices fully contact with the hot air flow and thoroughly remove the moisture and tetrahydrofuran in the slices.

[0004] To solve the above technical problems, a slice drying and THF removal tower of the present invention includes a vertical cylindrical tower body. A slice feed port is provided at the center of the top head of the tower body. A conical hopper is provided at the bottom of the tower body, and a slice discharge port is provided at the lower end of the conical hopper. A plurality of distribution umbrella caps in the shape of a right circular cone are arranged along the axis of the tower body. Except for the top-layer distribution umbrella cap, baffles coaxial with it are respectively provided above each distribution umbrella cap and below the bottom-layer distribution umbrella cap. Each baffle is in the shape of a flared mouth with a large upper part and a small lower part; a tower body hot air inlet is provided at the lower part of the tower body, and a tower body hot air outlet is provided at the top of the tower body.

[0005] Compared with the prior art, the present invention has achieved the following beneficial effects: PBS type slices enter the inner cavity of the tower body from the slice feed port at the top, first fall on the outer conical surface of the top-layer distribution umbrella cap, splash and then evenly scatter around, then fall downward on the inner conical surface of the baffle, splash towards the center again and fall through the central hole of the baffle and fall on the outer conical surface of the next-layer distribution umbrella cap; hot inert gas or compressed air enters from the lower part of the tower body and heats the PBS type slices during the reverse flow upward with them; in this way, during the multiple back-and-forth downward flight processes of the PBS type slices, the moisture or THF is gradually removed. Finally, the slices fall into the conical hopper and are discharged from the slice discharge port at its bottom, and the hot air is discharged from the tower body hot air outlet at the top of the tower.

[0006] As an improvement of the present invention, the upper ends of the baffle plates are respectively connected to the inner wall of the tower body. Each baffle plate is a thin-walled cavity structure. The lower walls of the baffle plates are respectively connected to the corresponding baffle plate air supply annular pipes through a plurality of uniformly distributed radial connecting pipes. The baffle plate air supply annular pipes surround the outer periphery of the tower body and are respectively provided with baffle plate hot air interfaces. A plurality of baffle plate hot air holes are uniformly distributed on the upper walls of the baffle plates. Hot nitrogen or hot air enters the inner cavities of the baffle plates from the baffle plate air supply annular pipes along the respective radial connecting pipes, and sprays upward from the baffle plate hot air holes on the upper walls of the baffle plates. When the slices fall on the baffle plates, they are heated by the baffle plates and dried and agitated by the hot air sprayed from the baffle plate hot air holes, further improving the drying effect and uniformity.

[0007] As a further improvement of the present invention, the diameter of the upper end of the conical hopper is larger than the diameter of the tower body, and the lower end of the tower body is inserted into the upper port of the conical hopper. An annular cover is provided at the upper port of the conical hopper, and the inner edge of the annular cover is welded to the outer wall of the tower body; the annular cavity below the annular cover is connected to the tower body air supply annular pipe through a plurality of uniformly distributed radial connecting pipes. A tower body hot air interface is provided on the circumference of the tower body air supply annular pipe. An annular hot air channel with a downward opening is provided between the lower port of the tower body and the inner wall of the conical hopper. Hot air enters the annular cavity at the upper end of the conical hopper from the tower body air supply annular pipe along the respective radial connecting pipes, and blows downward from the annular hot air channel between the tower body and the conical hopper, flowing downward along the circumferential wall first and then upward along the central area in the conical hopper, heating the slices falling into the conical hopper and making them loose to prevent blockage caused by adhesion.

[0008] As a further improvement of the present invention, a stirring rotor is provided at the lower part of the conical hopper. The stirring rotor includes a stirring shaft and a plurality of stirring disk plates fixed on the stirring shaft. The two ends of the stirring shaft are respectively supported on the conical hopper through bearing seats and are sealed with the conical hopper wall. The diameters of the stirring disk plates gradually decrease from the middle section of the stirring shaft to both ends. The stirring shaft drives the stirring disk plates to rotate, stirring the slices falling into the conical hopper to keep them in a loose state and prevent blockage caused by adhesion. The diameters of the stirring disk plates are distributed in a stepped manner, which can better fit the shape of the conical hopper and stir the slices more thoroughly.

[0009] As a further improvement of the present invention, a discharge cone is nested at the lower end of the hopper. The upper port of the discharge cone is closed and nested on the outer periphery of the lower end of the hopper. The annular cavity on the outer periphery of the lower end of the hopper is connected to the air supply ring pipe of the discharge cone through a plurality of evenly distributed radial connecting pipes. The air supply ring pipe of the discharge cone is provided with a hot air interface for the discharge cone on its circumference. An annular hot air channel with a downward opening is provided between the lower port of the hopper and the inner wall of the discharge cone. The slice discharge port is located at the lower end of the discharge cone. Hot air enters the annular cavity at the connection part between the hopper and the discharge cone from the air supply ring pipe of the discharge cone along each radial connecting pipe, and blows downward from the annular hot air channel between the hopper and the discharge cone, and blows downward along the circumferential wall first and then upward along the central area to the stirring rotor in the discharge cone. On the one hand, it further heats the slices falling into the discharge cone, and on the other hand, it makes the slices tumble and loosen, preventing adhesion and blockage.

[0010] As a further improvement of the present invention, a manhole communicating with the inner cavity is provided on the circumferential wall of the discharge cone. If blockage still occurs at the slice discharge port, the manhole can be opened, and the material can be conveniently removed from the manhole to make the equipment unblocked, avoiding disassembling the pipeline or cleaning from the manhole above, and reducing the parking treatment time.

[0011] As a further improvement of the present invention, a pressure measuring port, a temperature measuring interface, a sight glass, a spare port and a reserved valve port are further provided on the top head of the tower body. Manholes are respectively provided on the circumferences of the upper and middle parts of the tower body. The inner cavity of the tower can be pressure measured through the pressure measuring port, the flow state of the slices in the tower can be observed through the sight glass, and the inner cavity of the tower can be entered from the manhole for sectional cleaning or maintenance.

[0012] As a further improvement of the present invention, a plurality of temperature measuring interfaces are provided on the tower body along the height direction, and temperature transmitters are respectively installed in each temperature measuring interface. The temperature transmitter can measure the temperature of different cylinder sections in the tower body in real time, so as to control the hot air temperature entering different baffle plates.

[0013] As a further improvement of the present invention, a plurality of level gauge interfaces are provided on the tower body along the height direction, and level alarms are respectively installed in each level gauge interface. The level alarms are set in stages. When an abnormality occurs, different treatment schemes can be adopted according to the level condition.

[0014] As a further improvement of the present invention, each baffle is respectively composed of a plurality of fan-shaped plates distributed in an annular array. The splicing seams of adjacent two layers of baffles are staggered from each other, and the angle between the baffle and the axis of the tower body becomes smaller as it gets closer to the bottom of the tower body. The angle between each layer of baffle and the vertical wall of the tower body can be adjusted to control the descending speed of the slices. By adjusting the angle of the baffle, the residence time of the slices in each section of the tower body can be controlled to adapt to slices with different properties and particle sizes, ensuring more efficient removal of moisture and tetrahydrofuran in the slices. Since the slices just entering the drying tower have a relatively high water content, the baffle is set relatively flat to extend the contact time with the hot air and increase the evaporation amount. The slices reaching the lower part of the tower body are basically dry and the evaporation amount is small, so the baffle is set relatively steep to increase the descending speed of the slices. In the tower body, the phenomenon that the descending speed of the slices in the upper part is slow and the descending speed of the slices in the lower part is fast appears, greatly reducing the possibility of blockage in the tower. The splicing seams of adjacent two layers of baffles are staggered from each other, and a small amount of slices falling from the splicing seams will all fall on the baffle of the next layer, avoiding the long-height blanking short circuit of the slices. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments. The drawings are only for reference and illustration, and are not intended to limit the present invention.

[0016] Figure 1 It is the front view of the slice drying and THF removing tower of the present invention.

[0017] Figure 2 is Figure 1 the top view of

[0018] Figure 3 is Figure 1 the top view of Embodiment 1 of the baffle in

[0019] Figure 4 is Figure 1 the top view of Embodiment 2 of the baffle in

[0020] In the figure: 1. Tower body; 1a. Slice feed inlet; 1b. Tower body hot air outlet; 1c. Pressure measuring port; 1d. Temperature measuring interface; 1e. Sight glass; 1f. Spare port; 1g. Reserved valve port; 1h. Manhole; 1j. Level gauge interface; 2. Distributing umbrella cap; 3. Baffle; 3a. Baffle hot air hole; 4. Cone hopper; 4a. Stirring shaft; 4b. Stirring disc; 5. Discharge cone; 5a. Slice discharge outlet; 5b. Hand hole; 6a. Baffle air supply ring pipe; 6b. Tower body air supply ring pipe; 6c. Discharge cone air supply ring pipe. SPECIFIC EMBODIMENTS

[0021] Such as Figures 1 to 3As shown in the figure, the slice drying and THF removal tower of the present invention includes a tower body 1 in the shape of a vertical cylinder. A slice feed port 1a is provided at the center of the top head of the tower body 1. A conical hopper 4 is provided at the bottom of the tower body 1. A slice discharge port 5a is provided at the lower end of the conical hopper 4. A plurality of distribution umbrella caps 2 in the shape of a right circular cone are arranged along the axis of the tower body 1. Except for the top layer distribution umbrella cap, baffles 3 coaxial with them are respectively provided above each distribution umbrella cap 2 and below the bottom layer distribution umbrella cap. Each baffle 3 is in the shape of a flared mouth with a larger upper part and a smaller lower part. The upper ends of each baffle 3 are respectively connected to the inner wall of the tower body 1. Each baffle 3 is a thin-walled cavity structure. The lower walls of each baffle 3 are respectively connected to the corresponding baffle air supply ring pipes 6a through a plurality of uniformly distributed radial connecting pipes. Each baffle air supply ring pipe 6a surrounds the outer circumference of the tower body 1 and is respectively provided with baffle hot air interfaces. A plurality of baffle hot air holes 3a are uniformly distributed on the upper walls of each baffle 3. A tower body hot air outlet 1b is provided at the top of the tower body 1.

[0022] PBS-based slices enter the inner cavity of the tower body from the slice feed port 1a at the top, first fall on the outer conical surface of the top layer distribution umbrella cap 2, splash and then scatter evenly around, and then fall downward on the inner conical surface of the baffle 3, splash upward to the center again and fall through the central hole of the baffle 3 and fall on the outer conical surface of the next layer of distribution umbrella cap 2; inert hot gas or compressed air enters from the lower part of the tower body 1 and heats the PBS-based slices during the reverse flow upward with them; at the same time, the baffle 3 heats the slices falling on it, and the inert hot gas or compressed air enters the inner cavity of each baffle 3 from the baffle air supply ring pipe 6a along each radial connecting pipe and sprays upward from each baffle hot air hole 3a on the upper wall of the baffle 3 to dry and stir the slices scattered on the baffle 3. In this way, during the multiple back-and-forth downward flight processes of the PBS-based slices, moisture or THF is gradually removed. Finally, the slices fall into the conical hopper 4 and are discharged from the slice discharge port 5a at its bottom, and the hot air is discharged from the tower body hot air outlet 1b at the top of the tower.

[0023] The upper end diameter of the conical hopper 4 is larger than the diameter of the tower body 1, and the lower end of the tower body 1 is inserted into the upper port of the conical hopper 4, and an annular cover is provided at the upper port of the conical hopper 4. The inner edge of the annular cover is welded to the outer wall of the tower body 1; the annular cavity below the annular cover is connected to the tower body air supply ring pipe 6b through a plurality of uniformly distributed radial connecting pipes. A tower body hot air interface is provided on the circumference of the tower body air supply ring pipe 6b. An annular hot air channel with a downward opening is provided between the lower port of the tower body 1 and the inner wall of the conical hopper 4. Hot air enters the annular cavity at the upper end of the conical hopper 4 from the tower body air supply ring pipe 6b along each radial connecting pipe and blows downward from the annular hot air channel between the tower body 1 and the conical hopper 4, flowing downward along the circumferential wall first and then upward along the central area in the conical hopper 4, heating the slices falling into the conical hopper 4 and making them loose to prevent adhesion and blockage.

[0024] The lower part of the hopper 4 is provided with a stirring rotor. The stirring rotor includes a stirring shaft 4a and a plurality of stirring discs 4b fixed on the stirring shaft 4a. Both ends of the stirring shaft 4a are supported on the hopper 4 through bearing seats and are sealed with the hopper wall. The diameter of the stirring discs 4b gradually decreases from the middle section of the stirring shaft 4a towards both ends. The stirring shaft 4a drives each stirring disc 4b to rotate, stirring the slices falling into the hopper 4 to keep them in a loose state and prevent blockage caused by adhesion. The diameters of the stirring discs 4b are distributed in a stepped manner, which can better fit the shape of the hopper and stir the slices more thoroughly.

[0025] A discharge cone 5 is nested at the lower end of the hopper 4. The upper port of the discharge cone 5 is closed and nested on the outer periphery of the lower end of the hopper 4. The annular cavity on the outer periphery of the lower end of the hopper is connected to the air supply ring pipe 6c of the discharge cone through a plurality of evenly distributed radial connecting pipes. The circumferential wall of the air supply ring pipe 6c of the discharge cone is provided with a hot air interface for the discharge cone. An annular hot air channel with a downward opening is provided between the lower port of the hopper 4 and the inner wall of the discharge cone 5. The slice discharge port 5a is located at the lower end of the discharge cone 5. Hot air enters the annular cavity at the connection part of the hopper 4 and the discharge cone 5 from the air supply ring pipe 6c of the discharge cone along each radial connecting pipe, and blows downward from the annular hot air channel between the hopper 4 and the discharge cone 5, and blows upward along the circumferential wall first and then along the central area towards the stirring rotor in the discharge cone 5. On the one hand, it further heats the slices falling into the discharge cone 5, and on the other hand, it makes the slices tumble and loosen to prevent blockage caused by adhesion.

[0026] A manhole 5b communicating with the inner cavity is provided on the circumferential wall of the discharge cone 5. If blockage still occurs at the slice discharge port 5a, the manhole 5b can be opened, and the material can be conveniently removed from the manhole 5b to make the equipment unblocked, avoiding disassembling the pipeline or cleaning downward from the manhole 1h above, and reducing the shutdown handling time.

[0027] As Figure 2 shown, a pressure measuring port 1c, a temperature measuring interface 1d, a sight glass 1e, a spare port 1f and a reserved valve port 1g are also provided on the top head of the tower body 1. Manholes 1h are respectively provided on the circumferences of the upper and middle parts of the tower body 1. The inner cavity of the tower body can be pressure measured through the pressure measuring port 1c, the flow state of the slices in the tower body can be observed through the sight glass 1e, and the inner cavity of the tower body can be entered from the manhole 1h for segmented cleaning or maintenance of the inner cavity of the tower body.

[0028] The tower body 1 is provided with a plurality of temperature measuring interfaces 1d along the height direction. Temperature transmitters are respectively installed in each temperature measuring interface 1d to measure the temperature of different cylinder sections in the tower body 1 in real time, so as to control the hot air temperature entering different baffle plates 3.

[0029] The tower body 1 is provided with a plurality of level gauge interfaces 1j along the height direction, and level alarms are respectively installed in each level gauge interface 1j. The level alarms are set in stages. When an abnormality occurs, different treatment plans can be adopted according to the level condition.

[0030] There are four or six radial connecting pipes evenly distributed on the same circumference to ensure uniform distribution of hot air on the circumference of the tower body and ensure uniform heating of the slices on the same cross-section.

[0031] As Figure 4 shown, each baffle plate 3 is respectively spliced by a plurality of fan-shaped plates distributed in an annular array. The splicing seams of adjacent two layers of baffle plates 3 are staggered from each other, and the angle between the baffle plate 3 and the axis of the tower body is smaller the closer it is to the bottom of the tower body. The angle between each layer of baffle plate 3 and the vertical wall of the tower body can be adjusted to control the descending speed of the slices. By adjusting the angle of the baffle plate 3, the residence time of the slices in each section of the tower body can be controlled to adapt to slices of different properties and particle sizes, ensuring more efficient removal of moisture and tetrahydrofuran in the slices. The slices just entering the drying tower have a relatively high water content, and the baffle plate 3 is set relatively flat to extend the contact time with the hot air and increase the evaporation amount; the slices reaching the lower part of the tower body are basically dry and the evaporation amount is small, and the baffle plate 3 is set relatively steep to increase the descending speed of the slices. In the tower body, the phenomenon that the descending speed of the slices in the upper part is slow and the descending speed of the slices in the lower part is fast appears, greatly reducing the possibility of blockage in the tower. The splicing seams of adjacent two layers of baffle plates 3 are staggered from each other, and a small amount of slices falling from the splicing seams will all fall on the next layer of baffle plate 3, avoiding long-height blanking short circuits of the slices.

[0032] The above is only the preferred feasible embodiment of the present invention, and it does not limit the patent protection scope of the present invention. In addition to the above embodiments, the present invention can also have other implementation manners. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present invention. The technical features not described in the present invention can be realized by or adopted the existing technologies, and will not be elaborated here.

Claims

1. A slicing drying and THF removing tower, comprising a vertical cylindrical tower body. A slicing feed port is arranged at the center of the top head of the tower body. A conical hopper is arranged at the bottom of the tower body, and a slicing discharge port is arranged at the lower end of the conical hopper. It is characterized in that: Multiple positive conical material distribution umbrella caps are provided along the axis of the tower body. Except for the topmost material distribution umbrella cap, baffles coaxial with them are respectively provided above each material distribution umbrella cap and below the bottommost material distribution umbrella cap. Each baffle is in the shape of a flared opening with a larger upper part and a smaller lower part; a hot air inlet of the tower body is provided at the lower part of the tower body, and a hot air outlet of the tower body is provided at the top of the tower body; The upper ends of each baffle are respectively connected to the inner wall of the tower body. Each baffle is a thin-walled cavity structure. The lower walls of each baffle are respectively connected to the corresponding baffle air supply ring pipes through multiple uniformly distributed radial connecting pipes. Each baffle air supply ring pipe surrounds the outer periphery of the tower body and is respectively provided with a baffle hot air interface. Multiple baffle hot air holes are uniformly distributed on the upper walls of each baffle; Each baffle is respectively composed of multiple fan-shaped plates arranged in an annular array. The splicing seams of adjacent two layers of baffles are staggered from each other, and the angle between the baffle and the axis of the tower body is smaller closer to the bottom of the tower body; PBS class slices enter the inner cavity of the tower body from the top slice feeding port, first fall on the outer conical surface of the topmost material distribution umbrella cap, splash and then evenly scatter around, then fall downward on the inner conical surface of the baffle, splash towards the center again and fall through the central hole of the baffle and fall on the outer conical surface of the next layer of material distribution umbrella cap; Hot nitrogen or hot air enters the inner cavities of each baffle from the baffle air supply ring pipes along each radial connecting pipe, and sprays upward from each baffle hot air hole on the upper wall of the baffle. When the slices fall on the baffle, they are heated by the baffle and dried and stirred by the hot air sprayed from the baffle hot air holes, further improving the drying effect and uniformity; A stirring rotor is provided at the lower part of the conical hopper. The stirring rotor includes a stirring shaft extending along the diameter line of the upper part of the conical hopper and multiple stirring disc blades fixed on the stirring shaft. The two ends of the stirring shaft are respectively supported on the conical hopper through bearing seats and are sealed with the conical hopper wall. The diameter of the stirring disc blades gradually decreases from the middle section of the stirring shaft to both ends.

2. The sliced drying and THF removal column according to claim 1, characterized in that: The upper end diameter of the conical hopper is larger than the diameter of the tower body, and the lower end of the tower body is inserted into the upper port of the conical hopper. And an annular cover is provided at the upper port of the conical hopper, and the inner edge of the annular cover is welded to the outer wall of the tower body; The annular cavity below the annular cover is connected to the tower body air supply ring pipe through multiple uniformly distributed radial connecting pipes. A tower body hot air interface is provided on the circumference of the tower body air supply ring pipe. An annular hot air channel with a downward opening is provided between the lower port of the tower body and the inner wall of the conical hopper.

3. The slicing drying and THF removal tower according to claim 1, wherein: An outlet cone is nested at the lower end of the conical hopper. The upper port of the outlet cone is closed and nested on the outer periphery of the lower end of the conical hopper. The annular cavity on the outer periphery of the lower end of the conical hopper is connected to the outlet cone air supply ring pipe through multiple uniformly distributed radial connecting pipes. An outlet cone hot air interface is provided on the circumference of the outlet cone air supply ring pipe. An annular hot air channel with a downward opening is provided between the lower port of the conical hopper and the inner wall of the outlet cone. The slice outlet is located at the lower end of the outlet cone.

4. The slicing drying and THF removal column according to claim 3, wherein: A manhole communicating with the inner cavity is provided on the circumferential wall of the outlet cone.

5. The slicing drying and THF removing tower according to any one of claims 1 to 4, characterized in that: A pressure measuring port, a temperature measuring interface, a sight glass, a spare port and a reserved valve port are also provided on the top head of the tower body. Manholes are respectively provided on the circumferences of the upper part and the middle part of the tower body.

6. The slicing drying and THF removing column according to any one of claims 1 to 4, characterized in that: The tower body is provided with a plurality of temperature measurement interfaces along the height direction, and temperature transmitters are respectively installed in each temperature measurement interface.

7. The slicing drying and THF removing tower according to any one of claims 1 to 4, characterized in that: The tower body is provided with a plurality of level gauge interfaces along the height direction, and level alarms are respectively installed in each level gauge interface.

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