CN112797754A - Rotary dryer and material drying method - Google Patents

Rotary dryer and material drying method Download PDF

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Publication number
CN112797754A
CN112797754A CN202011463407.XA CN202011463407A CN112797754A CN 112797754 A CN112797754 A CN 112797754A CN 202011463407 A CN202011463407 A CN 202011463407A CN 112797754 A CN112797754 A CN 112797754A
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CN
China
Prior art keywords
rotary dryer
inner cylinder
drying
cylinder body
dryer according
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Granted
Application number
CN202011463407.XA
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Chinese (zh)
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CN112797754B (en
Inventor
张飞雄
钱其雯
姜维
吴远友
姚凌锋
朱文峰
欧阳志
王杰
韩天宇
陈小敏
李婷
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Inner Mongolia Shuangxin Polymer Materials Technology Research Institute Co ltd
Inner Mongolia Shuangxin Environment Friendly Material Co ltd
Original Assignee
Inner Mongolia Shuangxin Polymer Materials Technology Research Institute Co ltd
Inner Mongolia Shuangxin Environment Friendly Material Co ltd
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Priority to CN202011463407.XA priority Critical patent/CN112797754B/en
Publication of CN112797754A publication Critical patent/CN112797754A/en
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Publication of CN112797754B publication Critical patent/CN112797754B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
    • F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
    • F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B1/00—Cleaning by methods involving the use of tools
    • B08B1/30—Cleaning by methods involving the use of tools by movement of cleaning members over a surface
    • B08B1/32—Cleaning by methods involving the use of tools by movement of cleaning members over a surface using rotary cleaning members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/10—Heating arrangements using tubes or passages containing heated fluids, e.g. acting as radiative elements; Closed-loop systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/02—Applications of driving mechanisms, not covered by another subclass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/06—Chambers, containers, or receptacles
    • F26B25/14—Chambers, containers, receptacles of simple construction
    • F26B25/16—Chambers, containers, receptacles of simple construction mainly closed, e.g. drum
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

The invention relates to a rotary dryer and a material drying method, wherein the rotary dryer comprises a cylinder body (1), the cylinder body (1) comprises an outer cylinder body (11) and an inner cylinder body (12) positioned in the outer cylinder body (11), and a jacket layer (13) is arranged between the outer cylinder body (11) and the inner cylinder body (12); be equipped with support piece (3) in interior barrel (12), be equipped with mounting hole (31) on support piece (3) and be used for installing heat exchange tube (4), mounting hole (31) are equipped with one at least, heat exchange tube (4) in the outside on support piece (3) pass through inner tube (12) with jacket layer (13) are linked together. The rotary dryer and the material drying method have the advantages of good material drying effect, high drying efficiency and the like.

Description

Rotary dryer and material drying method
Technical Field
The invention belongs to the technical field of material treatment, and particularly relates to a rotary dryer and a material drying method.
Background
Polyvinyl alcohol (PVA) is an important chemical raw material, and is used for manufacturing building glue, textile sizing agent, polyvinyl butyral, gasoline-resistant pipeline, vinylon synthetic fiber, fabric treating agent, emulsifying agent, paper coating, adhesive, glue and the like. The drying is one of the important processes for producing PVA finished products and ensuring the quality of products in downstream industries, and the drying performance, the structural characteristics, the difficulty of manufacturing and processing, the manufacturing cost, the running condition and the like of the drying machine directly influence the quality of the PVA finished products.
At present, the drying machines used by domestic PVA manufacturers are basically the traditional rake drying machines introduced into the Japanese production line in the early 60 th century, and have the disadvantages of long structure, low drying efficiency, high energy consumption, large volume and inconvenient maintenance and repair. In recent years, some enterprises try to use the paddle dryer, but the paddle dryer is complex in structure, large in investment, high in cost and inconvenient to use, maintain and modify. The two dryers have the problems of dead drying corners, easy wall adhesion and crusting, yellow point material generation, influence on downstream customer use due to high methanol content in PVA and the like in the use process.
Disclosure of Invention
The invention aims to provide a rotary dryer and a material drying method, and solves the problems of poor drying effect and the like of the existing dryer.
In order to achieve the purpose, the invention provides a rotary dryer, which comprises a cylinder body, wherein the cylinder body comprises an outer cylinder body and an inner cylinder body positioned in the outer cylinder body, and a jacket layer is arranged between the outer cylinder body and the inner cylinder body;
the inner cylinder is internally provided with a support piece, the support piece is provided with at least one mounting hole for mounting a heat exchange tube, and the heat exchange tube on the outermost side of the support piece is communicated with the jacket layer through the inner cylinder.
According to one aspect of the invention, the support member is provided with a passage for the material to pass through, and the passage is arranged on the support member and/or is formed by a space between the outer edge of the support member and the inner wall of the inner cylinder body.
According to one aspect of the invention, the supporting piece is in a circular plate shape with cut edges, a plurality of supporting pieces are arranged in the inner cylinder body along the direction from the feeding end to the discharging end, and the cut edges of the plurality of supporting pieces are arranged in a staggered mode in the circumferential direction.
According to one aspect of the invention, the inner wall of the inner cylinder body is also provided with a detachable drainage tube, the drainage tube is communicated with the jacket layer, and one end of the drainage tube, which is far away from the jacket layer, is sequentially provided with a one-way pressure valve and an atomizing nozzle.
According to one aspect of the invention, the rotary dryer further comprises a steam chamber connected with the barrel, and the heat exchange pipe is communicated with the steam chamber;
the heat source in the steam chamber is a water vapor or inert gas heat source.
According to one aspect of the invention, the inner cylinder body is also provided with a gravity cleaning device, and the gravity cleaning device comprises a cleaning connection pipe and a cleaning steel ball arranged in the cleaning connection pipe;
the cleaning connecting pipe penetrates through the outer cylinder body and is connected to the outer wall of the inner cylinder body.
According to one aspect of the invention, the rotary dryer further comprises a feeding mechanism connected with the feeding end of the cylinder and a discharging structure connected with the discharging end of the cylinder;
the feeding mechanism comprises a feeding drive, a feeding hole and a feeding screw;
the discharging structure is provided with a steam inlet and a discharging hole.
According to one aspect of the invention, the feed end of the rotary dryer is connected with a negative pressure vacuum extractor.
According to one aspect of the invention, the rotary dryer further comprises a hot air drying auxiliary structure, wherein the hot air drying auxiliary structure comprises an inert gas introducing device, an air preheater and a blower which are sequentially connected;
the air blower is communicated with the feeding hole or the discharging hole.
According to one aspect of the invention, a first material raising plate, a second material raising plate and a third material raising plate are sequentially arranged in the inner cylinder body along the direction from the feeding end to the discharging end.
According to one aspect of the invention, the first material raising plates are arranged at equal intervals in the circumferential direction of the inner cylinder, each first material raising plate comprises a first plate connected with the inner cylinder and a second plate connected with the first plate, and the included angle between the first plate and the second plate is 90 degrees.
According to one aspect of the invention, the second material raising plates are arranged at equal intervals in the circumferential direction of the inner cylinder, each second material raising plate comprises a third plate connected with the inner cylinder and a fourth plate connected with the third plate, and an included angle between the third plate and the fourth plate is 135 degrees.
According to one aspect of the invention, the third material raising plates are arranged at equal intervals in the circumferential direction of the inner cylinder body, and the third material raising plates are plane straight plates.
According to one aspect of the invention, the rotary dryer further comprises a wireless temperature sensor, the steam chamber is provided with the wireless temperature sensor;
and the outer barrel body and/or the inner barrel body are/is provided with a wireless temperature sensor.
According to one aspect of the invention, two wireless temperature sensors are mounted at each wireless temperature sensor mounting position of the steam chamber, the outer cylinder and the inner cylinder.
According to one aspect of the invention, the support member is provided with a manhole.
According to one aspect of the invention, the discharging structure is further provided with a cooling water inlet and a cooling water outlet, and the cooling water inlet and the cooling water outlet are communicated with the outer cylinder and/or the inner cylinder.
According to one aspect of the invention, the barrel is further provided with a boiled water drainage device.
According to one aspect of the invention, the device further comprises a supporting device for supporting the cylinder and a rotary driving device for driving the cylinder to rotate.
According to one aspect of the invention, the barrel is arranged obliquely, and the feed end of the barrel is higher than the discharge end of the barrel.
The invention also provides a material drying method using the rotary dryer, which comprises the following steps: the method comprises the following steps:
s1, starting the rotary dryer to rotate the cylinder, starting the negative pressure vacuumizing device, and feeding the materials into the cylinder for drying;
s2, opening a steam chamber, feeding a heat source into a heat exchange pipe, and drying the material by using the heat exchange pipe;
s3, introducing steam into the jacket layer through the outermost heat exchange tubes on the supporting pieces to eliminate the drying temperature gradient;
s4, when the pressure in the jacket layer is higher than the working pressure of the one-way valve, the one-way valve is opened, and steam condensate is sprayed on the material through the drainage tube;
s5, the material is processed through the first material raising plate, the second material raising plate and the third material raising plate, and is moved to the discharging end through the channel of the supporting piece, and the material is discharged from the discharging end after the drying is completed.
According to one aspect of the invention, the method further comprises the step of introducing inert gas into the cylinder body through the hot air drying auxiliary structure to assist in drying in the material drying process.
According to the rotary dryer, the outermost heat exchange tube on the supporting piece is communicated with the jacket layer, so that in the rotating process of the cylinder, the fluid at the hot side in the jacket layer is introduced by using the outermost heat exchange tube, and the fluid at the hot side is introduced into the jacket layer. And then can effectively eliminate the temperature gradient when the temperature of the wall of the cylinder body is inconsistent with the temperature of the wall of the heat exchange tube during the drying of the material, provide a heating and drying chamber with uniform temperature for the material in the cylinder body, thereby ensuring and optimizing the drying effect of the material.
The supporting pieces are provided with the channels for the materials to pass through, and the channels of the supporting pieces are staggered, so that the flowing of the materials is more convenient, the materials are prevented from being accumulated together for a long time, the flowing route of the materials is improved, and the drying effect is favorably improved.
The rotary dryer is provided with the drainage tube, the one-way pressure valve and the atomizing nozzle, so that water vapor can be atomized into fine fog drops to be sprayed on a material in the material drying process, methanol and PVA can generate hydrogen bonds in the PVA drying process, and the water vapor can generate the hydrogen bonds with the PVA in the drying process, so that the methanol in the PVA can be replaced, the methanol can be volatilized from the PVA, and the whiteness of a product can be improved. On the other hand, the entry of water vapor can properly reduce the drying temperature, and prevent the thermal decomposition and thermal oxidation reaction of PVA caused by overhigh temperature.
The feeding end of the rotary dryer is also connected with a negative pressure vacuumizing device, and the negative pressure vacuumizing device is arranged, so that the working pressure in the inner cylinder body is negative pressure, and after the vacuum degree is high, the pressure formed in the drying process is favorably reduced, the boiling point of liquid phases such as methanol in the material is reduced, the material is promoted to be dried, and the energy-saving effect can be achieved.
According to the rotary dryer, the first lifting blade, the second lifting blade and the third lifting blade are sequentially arranged in the inner cylinder body from the feeding end to the discharging end, the difference between the wet adhesion degree of materials and the residence time of drying is fully considered, the first lifting blade is arranged at the position close to the feeding end, the materials are wet, the residence time of the materials on the first lifting blade is longer, the residence time of the materials on the second lifting blade and the residence time of the materials on the third lifting blade are sequentially shortened, the materials are lifted uniformly, the material drying path is optimized, the material drying effect is improved, and meanwhile the drying efficiency is improved.
According to the rotary dryer, the inert gas is nitrogen, the nitrogen firstly enters the air preheater to be heated, the heated nitrogen is sent into the barrel through the air blower and can be sent into the barrel through the feeding port or the discharging port, so that the heated nitrogen is further used for drying the materials under the drying operation of using steam to the materials by using the heat exchange tube, the drying effect and the drying efficiency are favorably improved, meanwhile, the inert gas is used for drying, a certain protection effect can be achieved on the materials, and the change of the properties of the materials in the drying process is avoided.
The rotary dryer is characterized in that the discharging structure is also provided with a cooling water inlet and a cooling water outlet, and the cooling water inlet and the cooling water outlet are communicated with the outer cylinder and/or the inner cylinder. Therefore, when the rotary dryer is stopped, the rotary dryer cylinder can be quickly cooled, maintenance and repair are convenient, and the service life of the rotary dryer can be prolonged.
The invention adopts the wireless temperature sensor of wireless transmission type, effectively solves the contradiction caused by wired transmission and cylinder rotation, and makes temperature measurement possible.
The gravity cleaning device comprises a cleaning connecting pipe and a cleaning steel ball. The cleaning connecting pipe penetrates through the outer cylinder body to be connected with the outer wall of the inner cylinder body, and the cleaning steel ball is arranged in the cleaning connecting pipe. So set up, along with the rotation of barrel, clean the steel ball and strike the cleaning to the internal barrel under the action of gravity periodically, prevent bonding, the hardening etc. of material among the drying process.
According to the rotary dryer, the cylinder body is obliquely arranged, and the feeding end of the cylinder body is higher than the discharging end of the cylinder body. So set up the flow that can further make things convenient for the material, avoid the material to pile up, optimize drying effect.
Drawings
FIG. 1 schematically illustrates a block diagram of a rotary dryer in accordance with one embodiment of the present invention;
FIG. 2 schematically shows an arrangement of support members according to an embodiment of the invention;
FIG. 3 schematically illustrates a view of an arrangement of heat exchange tubes according to an embodiment of the present invention;
FIG. 4 schematically shows a front view of FIG. 3;
FIG. 5 schematically illustrates a structural view of a drain tube according to an embodiment of the present invention;
FIG. 6 schematically shows a front view of FIG. 5;
FIG. 7 is a schematic diagram illustrating the construction of a gravity sweeping device according to one embodiment of the present invention;
FIG. 8 is a view schematically illustrating a hot air drying assistance structure according to an embodiment of the present invention;
FIG. 9 is a schematic representation of a perspective view of an inner barrel according to one embodiment of the present invention;
FIG. 10 schematically shows a front view of FIG. 9;
figure 11 schematically illustrates an arrangement of first material lifting plates according to an embodiment of the invention;
figure 12 schematically illustrates the arrangement of a second material raising plate according to an embodiment of the present invention;
figure 13 shows schematically the layout of a third material raising plate according to an embodiment of the present invention;
fig. 14 schematically shows a diagram of an arrangement of wireless temperature sensors according to one mode of the invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
In describing embodiments of the present invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship that is based on the orientation or positional relationship shown in the associated drawings, which is for convenience and simplicity of description only, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, the above-described terms should not be construed as limiting the present invention.
The present invention is described in detail below with reference to the drawings and the specific embodiments, which are not repeated herein, but the embodiments of the present invention are not limited to the following embodiments.
Referring to fig. 1 to 4, the rotary dryer of the present invention includes a cylinder 1, wherein the left end of the cylinder 1 is a feeding end, and the right end thereof is a discharging end. The cylinder 1 comprises a cylindrical outer cylinder 11 and a cylindrical inner cylinder 12 positioned in the outer cylinder 11, a jacket layer 13 is arranged between the outer cylinder 11 and the inner cylinder 12, and two ends of the jacket layer 13 are closed.
According to the rotary dryer, the supporting piece 3 is arranged in the inner cylinder 12 of the cylinder 1, the heat exchange tube 4 is arranged on the supporting piece 3, and the heat exchange tube 4 is connected with a heat supply source, so that materials in the inner cylinder 12 can be dried through the heat exchange tube 4.
In particular, the supporter 3 of the present invention is provided with mounting holes 31 for mounting the heat exchange pipe 4, and at least one of the mounting holes 31 is provided according to the concept of the present invention. According to one embodiment of the present invention, the support member 3 is provided with a set of mounting holes 31, the mounting holes 31 are arranged at equal intervals in the circumferential direction, the heat exchange tubes 4 are mounted on the mounting holes 31, and the heat exchange tubes 4 are also communicated with the jacket layer 13 through the inner cylinder 12.
According to the second embodiment of the present invention, a plurality of sets of mounting holes are provided on the support member 3, and the heat exchange tube 4 is mounted on the mounting hole 31; the multiple groups of mounting holes 31 are sequentially arranged from the center to the edge of the support 3, and the heat exchange tubes 4 on the outermost mounting holes 31 are also communicated with the jacket layer through the inner cylinder.
According to the rotary dryer, the outermost heat exchange tube 4 on the supporting piece 3 is communicated with the jacket layer 13, so that in the rotating process of the cylinder, the introduction of hot-side fluid in the jacket layer 13 is realized by using the outermost heat exchange tube 4, and the hot-side fluid is introduced into the jacket layer 13. And then can effectively eliminate the temperature gradient when the temperature of the wall of the cylinder body is inconsistent with the temperature of the wall of the heat exchange tube during the drying of the material, provide a heating and drying chamber with uniform temperature for the material in the cylinder body, thereby ensuring and optimizing the drying effect of the material.
According to the concept of the invention, the support 3 of the invention is provided with a channel for materials to pass through, according to one embodiment of the invention, the channel can be arranged on the support 3 itself, for example, the support 3 is eccentrically provided with a channel similar to a D shape for materials to pass through, a plurality of supports 3 are arranged in sequence in the inner cylinder 12, the channel can be arranged along the circumferential direction in a staggered way, so that the materials can be guided to flow in the inner cylinder 1, and the retention time of the materials in the equipment is prolonged, thereby ensuring the drying effect.
According to the second embodiment of the present invention, the passage for the contents to pass through may also be composed of a space between the outer side edge of the support member 3 and the inner wall of the inner cylinder 1. For example, as shown in fig. 2, according to an embodiment of the present invention, the supporter 3 is provided in a circular plate shape having a cut edge, and a gap between the cut edge of the supporter 3 and the inner wall of the inner cylinder 12 serves as a passage through which the material passes. Along feed end to discharge end direction, be equipped with a plurality of support piece 3 in the interior barrel 12 to a plurality of support piece 3's side cut is arranged at the dislocation of circumference, preferably arranges at the equal interval angle. That is, in the axial direction of the inner cylinder 12, the cut edges of the plurality of supporting members 3 are sequentially rotated by a certain angle clockwise or counterclockwise, and according to an embodiment of the present invention, it is defined that the cut edge of the leftmost supporting member 3 in the inner cylinder 12 is located at 0 °, the cut edge of the second supporting member 3 is 30 ° in the counterclockwise direction, the cut edge of the third supporting member 3 is 60 ° in the counterclockwise direction, and so on.
The supporting pieces 3 are arranged in a circular plate shape with the cut edges, and the cut edges of the supporting pieces 3 are staggered, so that the material flow is more convenient, the materials are prevented from being accumulated together for a long time, the flow path of the materials is improved, and the drying effect is favorably improved.
As shown in fig. 2, the support member 3 of the present invention is further provided with a manhole 32, and according to an embodiment of the present invention, the manhole 32 is provided as a circular through hole at a central position of the support member 3, so that the equipment can be maintained through the manhole 32 by a human when the equipment is out of order or periodically.
As shown in figure 1, the rotary dryer of the invention also comprises a steam chamber 2, a heat exchange pipe 4 of the invention is communicated with the steam chamber 2, and the steam chamber 2 provides a heat source for the heat exchange pipe 4. According to the concept of the present invention, the heat source in the steam chamber 2 may be a water vapor or inert gas heat source.
Referring to fig. 1, 5 and 6, the inner wall of the inner cylinder 12 of the present invention is further provided with a detachable drainage tube 5, the drainage tube 5 is communicated with the jacket layer 13, and one end of the drainage tube 5 far away from the jacket layer 13 is sequentially provided with a one-way pressure valve and an atomizing nozzle 51.
Specifically, taking a heat source as an example of steam, the steam enters the steam chamber 2, enters the heat exchange tubes 4 on the support 3, enters the jacket layer 13 through the heat exchange tubes 4 on the outermost side, then steam condensate in the jacket layer 13 enters the drainage tube 5, and the steam continuously enters the jacket layer 13, so that the pressure in the jacket layer 13 is increased, when the pressure in the jacket layer 13 is higher than the working pressure of the one-way pressure valve, the one-way pressure valve is opened, the steam condensate enters the atomizing nozzle 51 at the tail end of the one-way pressure valve through the drainage tube 5, and is uniformly sprayed into the inner cylinder 12 through the atomizing nozzle 51.
The rotary dryer provided by the invention is provided with the drainage tube 5, the one-way pressure valve and the atomizing nozzle 51, so that water vapor can be atomized into fine fog drops to be sprayed on a material in the material drying process, methanol can generate hydrogen bonds with PVA in the PVA drying process, and water vapor can generate hydrogen bonds with PVA in the drying process, so that the methanol in the PVA can be replaced, the methanol can be volatilized from the PVA, and the whiteness of a product can be improved. On the other hand, the entry of water vapor can properly reduce the drying temperature, and prevent the thermal decomposition and thermal oxidation reaction of PVA caused by overhigh temperature.
Referring to fig. 1 and 7, the rotary dryer of the present invention further includes a gravity sweeping device 10. In the drying process, because of the factors of material wet adhesion, heat transfer, dust and the like, scale layers are inevitably formed on the inner wall of the inner cylinder body 12, the surface of the heat exchange tube bundle 4 and the surface of the support 3, and the drying process is influenced. The gravity cleaning device 10 is arranged on the inner cylinder 12, and the inner wall is periodically knocked and cleaned along with the rotation of the cylinder 1, so that the materials are prevented from being bonded, hardened and the like in the drying process. Specifically, according to one embodiment of the present invention, gravity cleaning device 10 of the present invention comprises cleaning nozzle 101 and cleaning steel ball 102. The cleaning connection pipe 101 penetrates through the outer cylinder 11 to be connected with the outer wall of the inner cylinder 12, and the cleaning steel ball 102 is arranged in the cleaning connection pipe 101. So set up, along with the rotation of barrel 1, clean the steel ball and strike the cleaning to inner barrel 12 under the action of gravity periodically, prevent bonding, the hardening of dry run in-process material etc.. According to the concept of the present invention, a plurality of gravity sweeping devices 10 may be disposed at equal angular intervals along the circumferential direction of the cylinder 1.
Referring to fig. 1, according to an embodiment of the present invention, the feed end of the rotary dryer of the present invention is further connected to a negative pressure vacuum pumping device, and the negative pressure vacuum pumping device is arranged to make the working pressure in the inner cylinder 12 negative, so that after the vacuum degree is high, the pressure formed in the drying process is reduced, the boiling point of liquid phases such as methanol in the material is reduced, the material drying is promoted, and the energy saving effect can be achieved.
As shown in fig. 1, the rotary dryer of the present invention further includes a feeding mechanism 6 connected to the feeding end of the drum 1 and a discharging mechanism 7 connected to the discharging end of the drum 1. The feeding mechanism 6 includes a feeding drive 61, a feed port 62, and a feeding screw 63. The discharging structure 7 is provided with a steam inlet 71 and a discharging outlet 72. The steam enters the steam chamber 2 through the steam inlet 71 and then enters the heat exchange tube 4 to realize the drying operation of the materials.
Referring to fig. 1 and 8, the rotary dryer of the present invention further includes a hot air drying auxiliary structure 8, and the hot air drying auxiliary structure 8 includes an inert gas introducing device, an air preheater 81 and a blower 82, which are connected in sequence. The blower 82 communicates with the inlet 62 or the outlet 72. Specifically, according to an embodiment of the present invention, the inert gas is nitrogen, the nitrogen firstly enters the air preheater 81 to be heated, the heated nitrogen is sent into the barrel 1 by the blower, and the heated nitrogen can be sent into the barrel 1 through the feed inlet 62 or the discharge outlet 72, so that the heated nitrogen is further used to directly dry the material in the barrel under the drying operation of the material by using steam through the heat exchange tube 4, which is beneficial to improving the drying effect and the drying efficiency, and meanwhile, the inert gas is entered for drying, so as to provide a certain protection effect for the material, and avoid the change of the material property in the drying process.
Of course, according to the concept of the present invention, the steam may enter the air preheater before entering the drum, and then enter the drum through the steam inlet via the blower.
As shown in fig. 1 and 9-13, a first material raising plate 121, a second material raising plate 122 and a third material raising plate 123 are sequentially arranged in the inner cylinder 1 along the direction from the feeding end to the discharging end of the cylinder 1, i.e., along the direction from left to right in fig. 1, and the first material raising plate 121, the second material raising plate 122 and the third material raising plate 123 are axially and alternately arranged along the cylinder 1.
The first material raising plates 12 of the present invention are preferably disposed at equal intervals in the circumferential direction of the inner cylinder 12, the first material raising plates 121 include a first plate 1211 connected to the inner cylinder 12 and a second plate 1212 connected to the first plate 1211, and an included angle between the first plate 1211 and the second plate 1212 is 90 °.
The second material raising plates 122 are preferably arranged at equal intervals in the circumferential direction of the inner cylinder 12, the second material raising plates 122 include third plates 1221 connected to the inner cylinder 12 and fourth plates 1222 connected to the third plates 1221, and an included angle between the third plates 1221 and the fourth plates 1222 is 135 °.
The third material raising plates 123 are preferably arranged at equal intervals in the circumferential direction of the inner cylinder 12, and the third material raising plates 123 are planar straight plates.
According to the rotary dryer, the first lifting blade 121, the second lifting blade 122 and the third lifting blade 123 are sequentially arranged in the inner cylinder body 1 from the feeding end to the discharging end, the difference between the wet adhesion degree of materials and the residence time of drying is fully considered, the first lifting blade is arranged at the position close to the feeding end, the materials are wet, the residence time of the materials on the first lifting blade 121 is longer, and then the residence time of the materials on the second lifting blade 122 and the third lifting blade 123 is sequentially shortened, so that the materials are lifted uniformly, the material drying path is optimized, the material drying effect is improved, and meanwhile, the drying efficiency is improved. Of course, according to the concept of the present invention, the first material raising plate 121, the second material raising plate 122 and the third material raising plate 123 may be simultaneously disposed at the same position.
As shown in fig. 1, the discharging structure 7 of the present invention is further provided with a cooling water inlet 73 and a cooling water outlet 74, and the cooling water inlet 73 and the cooling water outlet 74 are communicated with the outer cylinder 11 and/or the inner cylinder 12. Therefore, when the rotary dryer is stopped, the rotary dryer can be quickly cooled, maintenance and repair are convenient, and the service life of the rotary dryer can be prolonged.
Referring to fig. 1, the cylinder 1 of the present invention is further provided with a boiling water draining device 1a, which can completely remove the adhesive substances which are difficult to remove by boiling or the like, and the boiled and washed water is drained by the boiling water draining device 1 a. The rotary dryer of the present invention can easily clean the adhered objects in the drum 1 by the various arrangements described above, and for example, the probability of occurrence of adhesion which is difficult to clean after periodic knocking and cleaning is greatly reduced by the arrangement of the gravity cleaning device 10, and the cleaning of the drum 1 can be easily realized by the combination with the boiling and washing device 1a of the present invention. On the other hand, due to the various limiting arrangements described above, the use of the brewing device 1a according to the invention for brewing cleaning does not affect its service life.
As shown in fig. 1 and 14, the rotary dryer further includes a wireless temperature sensor 9, the steam chamber 2 is provided with the wireless temperature sensor 9, and the outer cylinder 11 and/or the inner cylinder 12 is provided with the wireless temperature sensor 9. The wireless temperature sensor 9 on the outer cylinder body 11 extends into the jacket layer 13, and the wireless temperature sensor 9 on the outer wall of the inner cylinder body 12 extends into the inner cylinder body 12. According to one embodiment of the present invention, wireless temperature sensors 9 are provided at both ends and at the middle position of the cylinder 1 in the axial direction of the cylinder 1, and two wireless temperature sensors 9 are provided at each position. That is, in the present invention, two wireless temperature sensors 9 may be provided at the same position on the outer cylinder 11, and two wireless temperature sensors 9 may be provided at the same position on the inner cylinder 12. Thus, one sensor may fail and the other may be used. The invention adopts a wireless transmission mode to effectively solve the contradiction between wired transmission and cylinder rotation, so that temperature measurement becomes possible.
As shown in fig. 1, the rotary dryer of the present invention further includes a supporting device a for supporting the drum 1 and a rotary driving device b for driving the drum 1 to rotate. The barrel 1 is obliquely arranged, and the feeding end of the barrel 1 is higher than the discharging end of the barrel 1. So set up the flow that can further make things convenient for the material, avoid the material to pile up, optimize drying effect.
The invention also provides a material drying method using the rotary dryer, which comprises the following steps: s1, starting the rotary dryer to rotate the cylinder, starting the negative pressure vacuumizing device, and feeding the materials into the cylinder for drying; s2, opening a steam chamber, feeding a heat source into a heat exchange pipe, and drying the material A by using the heat exchange pipe; s3, introducing steam into the jacket layer through the outermost heat exchange tubes on the supporting pieces to eliminate the drying temperature gradient; s4, when the pressure in the jacket layer is higher than the working pressure of the one-way valve, the one-way valve is opened, and steam condensate is sprayed on the material through the drainage tube; s5, the material is processed through the first material raising plate, the second material raising plate and the third material raising plate, and is moved to the discharging end through the channel of the supporting piece, and the material is discharged from the discharging end after the drying is completed.
In addition, in the PVA drying process, inert gas is introduced into the barrel through the hot air drying auxiliary structure in the whole process to assist drying, and the drying effect is further improved.
According to the rotary dryer, materials enter the dryer from the feeding hole 62 and then rotate along with the rotary cylinder 1, the built-in steam heat exchange tube 4, the special jacket layer 13, the supporting piece 3, the hot air drying auxiliary device 8, the drainage tube 5 and the like can completely guarantee sufficient and sufficient drying of the materials, material pollution is avoided, volatile components are reduced, meanwhile, the material distributing device and the material lifting device are arranged at fixed positions in the cylinder, the materials can be pushed, lifted and spread evenly and orderly, the problems of material aggregation, uneven distribution, poor drying, influence on product quality and the like are solved. And finally, drying the material under the set advancing route, and discharging the material from a discharge hole to obtain a dried qualified product.
The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and it is apparent to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (22)

1. A rotary dryer comprises a cylinder body (1), and is characterized in that the cylinder body (1) comprises an outer cylinder body (11) and an inner cylinder body (12) positioned in the outer cylinder body (11), and a jacket layer (13) is arranged between the outer cylinder body (11) and the inner cylinder body (12);
be equipped with support piece (3) in interior barrel (12), be equipped with mounting hole (31) on support piece (3) and be used for installing heat exchange tube (4), mounting hole (31) are equipped with one at least, heat exchange tube (4) in the outside on support piece (3) pass through interior barrel (12) with jacket layer (13) are linked together.
2. A rotary dryer according to claim 1, characterized in that the support (3) has a passage for the passage of material, which is provided on the support (3) and/or is constituted by a spacing between an outer edge of the support (3) and an inner wall of the inner cylinder (12).
3. The rotary dryer according to claim 2, wherein the support (3) is in the form of a disc with cut edges, a plurality of supports (3) are arranged in the inner cylinder (12) in the direction from the feed end to the discharge end, and the cut edges of the plurality of supports (3) are arranged offset in the circumferential direction.
4. The rotary dryer of claim 1, wherein a detachable drainage tube (5) is further installed on the inner wall of the inner cylinder (12), the drainage tube (5) is communicated with the jacket layer (13), and a one-way pressure valve and an atomizing nozzle (51) are sequentially arranged at one end of the drainage tube (5) far away from the jacket layer (13).
5. A rotary dryer according to claim 1 further comprising a steam chamber (2) connected to the drum (1), the heat exchange tube (4) communicating with the steam chamber (2);
the heat source in the steam chamber (2) is a water vapor or inert gas heat source.
6. A rotary dryer according to claim 1, wherein the inner cylinder (12) is further provided with a gravity cleaning device (10), the gravity cleaning device (10) comprises a cleaning connection pipe (101) and a cleaning steel ball (102) arranged in the cleaning connection pipe (101);
the cleaning connecting pipe (101) penetrates through the outer cylinder body (11) and is connected to the outer wall of the inner cylinder body (12).
7. A rotary dryer according to claim 1 further comprising a feed mechanism (6) connected to the feed end of the drum (1) and a discharge structure (7) connected to the discharge end of the drum (1);
the feeding mechanism (6) comprises a feeding drive (61), a feeding hole (62) and a feeding screw (63);
the discharging structure (7) is provided with a steam inlet (71) and a discharging hole (72).
8. The rotary dryer of claim 7, wherein a negative pressure vacuum is connected to the feed end of the rotary dryer.
9. The rotary dryer according to claim 7, further comprising a hot air drying auxiliary structure (8), the hot air drying auxiliary structure (8) comprising an inert gas introduction device, an air preheater (81) and a blower (82) connected in sequence;
the air blower (82) is communicated with the feed inlet (62) or the discharge outlet (72).
10. The rotary dryer according to claim 1, wherein a first material raising plate (121), a second material raising plate (122) and a third material raising plate (123) are sequentially arranged in the inner cylinder (12) along the direction from the feeding end to the discharging end.
11. The rotary dryer according to claim 10, wherein the first material raising plates (121) are arranged at equal intervals in the circumferential direction of the inner cylinder (12), the first material raising plates (121) include a first plate block (1211) connected to the inner cylinder (12) and a second plate block (1212) connected to the first plate block (1211), and an included angle between the first plate block (1211) and the second plate block (1212) is 90 °.
12. The rotary dryer according to claim 11, wherein the second material raising plates (122) are arranged at equal intervals in the circumferential direction of the inner cylinder (12), the second material raising plates (122) comprise a third plate (1221) connected to the inner cylinder (12) and a fourth plate (1222) connected to the third plate (1221), and the third plate (1221) and the fourth plate (1222) form an included angle of 135 °.
13. The rotary dryer according to claim 12, wherein the third material raising plates (123) are arranged at equal intervals in the circumferential direction of the inner cylinder (12), and the third material raising plates (123) are flat straight plates.
14. A rotary dryer according to claim 1, further comprising a wireless temperature sensor (9), the steam chamber (2) being provided with the wireless temperature sensor (9);
and the outer cylinder body (11) and/or the inner cylinder body (12) are/is provided with a wireless temperature sensor (9).
15. A rotary dryer according to claim 14 wherein two wireless temperature sensors (9) are mounted at each wireless temperature sensor mounting location of the steam chamber (2), outer cylinder (11), inner cylinder (12).
16. A rotary dryer according to any one of claims 1-3 wherein the support (3) is provided with a manhole (32).
17. A rotary dryer according to claim 7, wherein the outlet structure (7) is further provided with a cooling water inlet (73) and a cooling water outlet (74), the cooling water inlet (73) and the cooling water outlet (74) being in communication with the outer cylinder (11) and/or the inner cylinder (12).
18. A rotary dryer according to claim 1 wherein the drum (1) is further provided with a boil-and-wash water drainage means (1 a).
19. A rotary dryer according to claim 1 further comprising support means (a) for supporting the drum (1) and rotary drive means (b) for driving the drum (1) in rotation.
20. A rotary dryer according to claim 1 wherein the drum (1) is arranged inclined, the feed end of the drum (1) being higher than the discharge end of the drum (1).
21. A method of drying material using the rotary dryer of any one of claims 1-20, comprising:
s1, starting the rotary dryer to rotate the cylinder, starting the negative pressure vacuumizing device, and feeding the materials into the cylinder for drying;
s2, opening a steam chamber, feeding a heat source into a heat exchange pipe, and drying the material by using the heat exchange pipe;
s3, introducing steam into the jacket layer through the outermost heat exchange tubes on the supporting pieces to eliminate the drying temperature gradient;
s4, when the pressure in the jacket layer is higher than the working pressure of the one-way valve, the one-way valve is opened, and steam condensate is sprayed on the material through the drainage tube;
s5, the material is processed through the first material raising plate, the second material raising plate and the third material raising plate, and is moved to the discharging end through the channel of the supporting piece, and the material is discharged from the discharging end after the drying is completed.
22. The material drying method according to claim 21, further comprising introducing inert gas into the cylinder through a hot air drying auxiliary structure to assist in drying during the material drying process.
CN202011463407.XA 2020-12-11 2020-12-11 Rotary dryer and material drying method Active CN112797754B (en)

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CN205027101U (en) * 2015-09-22 2016-02-10 山西康瑞建材新技术有限责任公司 Antiseized knot vibrating device of accelerator grog drying roller
CN106091633A (en) * 2016-06-25 2016-11-09 五洲丰农业科技有限公司 A kind of drum-type fertilizer drying system
CN206989621U (en) * 2017-07-11 2018-02-09 中国石油化工股份有限公司 Vacuum impregnation rotary dryer
CN209399692U (en) * 2018-12-29 2019-09-17 焦作市真节能环保设备科技有限公司 Sandwich-type steam drying machine cylinder
CN110527827A (en) * 2019-08-02 2019-12-03 攀枝花学院 A kind of vanadium slag continous way Leaching Vanadium solution containment

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060213075A1 (en) * 2005-03-28 2006-09-28 Andrew Livingston Rotary impinging stream dryer
CN104101187A (en) * 2013-04-15 2014-10-15 天华化工机械及自动化研究设计院有限公司 Novel high-efficient multi-chamber steam pipe rotating cylindrical dryer
CN103591779A (en) * 2013-11-20 2014-02-19 韩旭新 Brown coal pipe drier
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CN205027101U (en) * 2015-09-22 2016-02-10 山西康瑞建材新技术有限责任公司 Antiseized knot vibrating device of accelerator grog drying roller
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CN110527827A (en) * 2019-08-02 2019-12-03 攀枝花学院 A kind of vanadium slag continous way Leaching Vanadium solution containment

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