JP2008267737A - Multi-functional stirring heat transfer-type drying method and its device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stirring heat transfer-type drying means capable of preventing a material from snowballing by bunching up together, and improving operability in supplying the material and discharging the material after its processing. <P>SOLUTION: A crushing-stirring rotary blade 12 rotatable at a low speed in a state of inclining a shaft to a forward side at an initial period of drying in charging the material having a large water content, and a drying-stirring rotary blade 13 rotatable at a high speed in a state of inclining the shaft 9 to a backward side with respect to the crushed and dried material of a small water content in an intermediate period of drying and thereafter are disposed in a drying chamber surrounded by a heat medium jacket 7. The crushing-stirring rotary blade 12 and the drying-stirring rotary blade 13 are divided and disposed in parallel with each other along the single shaft 9, and the inclination of the shaft 9 is performed by inclining the drying chamber itself in the forward or backward direction. A cut 14 is formed at the tip of the crushing-stirring rotary blade 12, and a crushing blade 15 is projected from the heat transfer face of the inner periphery of the drying chamber opposed to the cut portion 14. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a multi-function agitated heat transfer type drying method and apparatus for winding up a raw material along a heat transfer surface around a drying chamber surrounded by a heat medium jacket to crush and dry the raw material.

  Conventionally, as this kind of agitated heat transfer type drying apparatus, for example, as disclosed in Patent Document 1, the upper part of the drying chamber is formed in a cylindrical shape and the lower part is formed in a conical shape, and the upper and lower portions of the drying chamber are formed. The cylindrical and conical inner wall surfaces are formed on the heat transfer surface, the raw material input port is provided in the lower part of the drying chamber, the dry product discharge port is provided in the cylindrical surface in the center of the drying chamber, and the lower part of the conical surface is provided. There is a technology in which a discharge port for the remaining product is provided, and a stirring blade that lifts the raw material along the heat transfer surface while stirring the raw material in the center of the drying chamber and a blower blade that generates a descending vortex flow above the stirring blade. .

When using the drying apparatus, first, the raw material is introduced into the drying chamber from the raw material inlet, the motor is started to rotate the rotating shaft, and at the same time, steam is introduced into the jacket to heat the heat transfer surface. Then, the upper blowing blade and the lower stirring blade rotate together with the rotating shaft, and the blades of the stirring blade lift the raw material along the heat transfer surface while heating from the bottom to the top. The raw material lifted up to the upper end of the blade in this way falls to the conical inner heat transfer surface at the bottom of the drying chamber, and is again lifted by the blade from the bottom to the top while being heated on the heat transfer surface. Further, when the raw material falls, it is struck against the heat transfer surface of the conical inner surface, and drying is promoted by receiving strong heat transfer from the conical heat transfer surface. At this time, the upper half fans of the blower blades in the upper part of the drying chamber discharge moisture evaporated from the raw material from the exhaust port, and the lower half fans generate a high-temperature descending vortex to dry the raw material. When the charged raw material becomes a dry product, the discharge port is opened and the dry product is collected. At this time, since the inner surface of the lower part of the drying chamber has a conical shape that tapers downward, it is assumed that the dried product remaining from the remaining product discharge port does not remain and can be easily discharged.
Japanese Patent No. 3562640

  In the conventional vertical stirring heat transfer type drying apparatus described above, the lower part of the drying chamber is made conical to make it easy to lift the raw material gathered at the bottom with the blades of the stirring blade. There are also many raw materials that tend to form dumplings. When the raw material is in a dumpling shape, it may adhere to the blades of the stirring blade and become a snowman. Furthermore, in the conventional vertical stirring heat transfer type drying apparatus, the operability at the time of supply of raw materials and at the time of discharge after processing is inferior, and maintenance and cleaning after use are difficult.

  Therefore, the present invention was created in view of the conventional circumstances as described above, and when the raw material is scraped up while being heated along the heat transfer surface in the drying chamber, the raw material becomes a dumpling and becomes a snowman. Multi-function that can prevent the enlargement of the product and improve the operability at the time of supply of raw materials and discharge after processing, and at the same time easy maintenance and cleaning after use It aims at providing the stirring heat-transfer-type drying method and its apparatus.

  In order to solve the above-described problems, in the multi-function stirring heat transfer type drying method according to the present invention, in the initial stage of drying at the time of charging a raw material having a high water content, the rotating shaft is crushed and stirred on the rotating blade side. The drying chamber is tilted so as to be positioned at a low speed and the raw material is dried while being crushed and stirred by the low-speed rotation of the crushing and stirring rotary blades. The drying chamber is tilted so that the drying / stirring rotary blade side is positioned below, the stirring / drying is performed by high-speed rotation of the drying / stirring rotary blade, and the initial crushing drying to the final drying are performed continuously. To do.

  In addition, the crushing / stirring rotary blade and the stirring rotary blade can be tilted around a fulcrum shaft between a tilted position in the forward direction and a tilted position in the reverse direction, and the rotating shaft is coaxially arranged to be rotatable. It is characterized by becoming.

  Furthermore, the inclination angle in the forward direction of the drying chamber at the time of crushing and stirring is usually 15 ° to 30 °, and the inclination angle in the reverse direction at the time of stirring is usually 30 ° to 75 °, and the angle can be freely set depending on the application. It is characterized by.

  Further, the cleaning of the drying chamber after use is performed by opening one end side of the drying chamber.

  Furthermore, in the multi-function stirring heat transfer type drying apparatus according to the present invention, the crushing / stirring rotary blade is arranged on one side of the single rotating shaft, and the drying / stirring rotary blade is arranged on the other side so as to be rotatable and tiltable. And having both blades provided in a drying chamber surrounded by a heat medium jacket.

  Further, the crushing / stirring rotary blade and the drying / stirring rotary blade are inclined by tilting the drying chamber itself in either the forward or reverse direction.

  Further, the crushing / stirring rotary blade has a notch at the tip, and a crushing blade is provided on the heat transfer surface around the drying chamber facing the notch.

  Further, the drying chamber is provided with a removable lid at one end, and the lid holds a rotating shaft via a bearing.

  In the multifunctional stirring heat transfer type drying method and apparatus according to the present invention configured as described above, the raw material having a high water content in the initial stage of drying is a crushing / stirring rotary blade in an inclined drying chamber The crushed and dried raw material having a low water content in the middle stage and thereafter is stirred and dried by high-speed rotation of the drying and stirring rotary blades in the inclined drying chamber. By tilting both blades in this way, when the raw material is scraped up while being heated along the heat transfer surface in the drying chamber, the raw material in a lump is dropped by its own weight, so that the raw material is dumped. It will be possible to prevent the snowball from becoming enlarged.

  According to the present invention, when the raw material is scraped up while being heated along the heat transfer surface in the drying chamber, the raw material can be prevented from becoming a dumpling and being enlarged into a snowball, and the supply of the raw material can be prevented. At the same time, the operability at the time of discharge at the time of processing and after processing is improved, and maintenance and cleaning after use can be easily performed.

  That is, by using a crushing / stirring rotary blade, it is possible to achieve a function of crushing the raw material before the raw material is enlarged. By crushing and stirring this, it was possible to prevent the raw material from becoming a dumpling and enlarged into a snowball, and to reduce the power load due to the blades.

  At the same time, the crushing / stirring rotary blade and the drying / stirring rotary blade are divided and arranged along a single rotation axis, and the inclination of the rotation shaft is caused by tilting the drying chamber itself in either the forward or reverse direction. As a result, the effect of both blades can be fully exerted simply by changing the inclination of the entire drying chamber. In other words, in the initial stage of drying, the drying chamber is tilted toward the crushing / stirring rotary blade side that has a crushing function at a low speed, and the drying operation is performed while crushing at a low speed. It is possible to dry efficiently at high speed by tilting. In addition, since the inclination can be changed in accordance with the dry state, it is possible to obtain an efficient drying apparatus that matches the physical properties of various raw materials.

  In addition, the crushing / stirring rotary blade has a notch at the tip, and a crushing blade is provided on the heat transfer surface around the drying chamber facing the notch, so that the material can be efficiently crushed. At the same time, it was possible to reduce the power load by operating at a low speed by crushing and stirring rotating blades and crushing at the initial stage.

  Furthermore, the lid is provided with a detachable lid at one end of the drying chamber, and since the lid holds the rotating shaft via a bearing, after use, the drying chamber is inclined to a desired angle, The inside of the drying chamber can be easily cleaned by removing the lid.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the drying system using the multi-function stirring heat transfer type drying apparatus according to the present invention is connected to the inlet C1 into the drying chamber in the drying apparatus S3 from the raw material supply apparatus S2 below the supply hopper S1. A boiler S8 for supplying a heat medium such as vapor pressure is connected to a heat medium inlet A1a of a heat medium jacket (to be described later) of the drying device S3 via a path of the heat medium supply U1. At this time, the heat medium drained by heat exchange with the raw material is discharged from the heat medium outlets A2a and A2b at the lower portions on both sides of the drying device S3 through the path of the heat medium discharge U2.

  Further, the exhaust hole G in the upper part of one side surface of the drying device S3 is connected to the duster S4 through a valve, and the high-temperature air discharged from the drying device S3 passes through the duster S4 and collects dust. ing. The duster S4 is connected to a condenser S5, and the condenser S5 is connected to each of a condensed water tank S6, a vacuum pump S7, and an exhaust blower S10.

  The condenser S5 is connected to each path of the cooling water supply water U3 and the cooling water drainage U4, condenses the high-humidity air in the condenser S5, and then stores it in the condensed water tank S6. It is made to drain through the route of drainage U5. At this time, in the case of vacuum drying, it is sucked by the vacuum pump S7 and discharged through the paths of the suction separation drainage U6 and the suction separation exhaust U7. Moreover, although it operate | moves by a normal pressure (atmospheric pressure) depending on a dried material, in that case, it is assumed that it is sucked and discharged by the exhaust fan S10.

  Next, a specific configuration of the drying device S3 will be described. As shown in FIG. 2, the drying device S3 is configured to swingably support a drum-like casing 3 having a drying chamber inside between a pair of fulcrum shafts 2 formed at the top of the gantry 1 and facing each other. In addition, the casing 3 itself can be tilted in either the forward or reverse direction by an angle changing mechanism 4 disposed between the lower end of the casing 3 and the mount 1. As a matter of course, the drying chamber tilts according to the tilt of the casing 3. In the following, the counterclockwise direction from the horizontal plane around the fulcrum shaft 2 is expressed as a forward direction, and the clockwise direction is expressed as a reverse direction.

  In the tilting operation of the casing 3, for example, as shown in FIG. 3A, the tilt angle in the positive direction at the time of crushing and stirring is normally 15 ° to 30 °, and as shown in FIG. The angle adjustment range of the angle changing mechanism 4 is set so that the inclination angle in the reverse direction during stirring is usually 30 ° to 75 °. In addition, the angle can be freely set depending on the application.

  As the angle changing mechanism 4, for example, any one of a pneumatic cylinder, a hydraulic cylinder, an electric cylinder, a worm gear reduction mechanism, and the like can be selected and adopted depending on the size of the raw material and the angle specification. An inspection port C3 is provided at the other upper end of the casing 3 so that the inspection can be easily performed by looking into the drying chamber from above.

  Both end opening sides of the casing 3 are closed by the lid portions 5 and 6, and the outer periphery of the casing 3 is surrounded by the heat medium jacket 7. The above-described boiler S8 is connected to the heat medium inlet A1a of the heat medium jacket 7 through the path of the heat medium supply U1. Of these, a blade drive prime mover 8 is attached to one lid portion 5 side, and a shaft 9 which is a rotation shaft of the blade drive prime mover 8 passes through the lid portion 5 via a drive side bearing 10 and a shaft seal 11. In the drying chamber inside the casing 3.

  The shaft 9 is provided with a crushing / stirring rotary blade 12 and a drying / stirring rotary blade 13 arranged side by side in a state of being divided into left and right. As shown in (b), a plurality of protruding crushing blades 15 protrude from the inner peripheral heat transfer surface of the drying chamber in the casing 3 facing the notch 14. . Thus, the drying chamber in the casing 3 is divided into two parts: crushing and agitation drying by crushing and agitation rotating blades 12 and agitation drying by drying and agitation rotating blades 13 respectively.

  Then, at the initial stage of drying at the time of charging the raw material having a high water content, the casing 3 is moved by the angle changing mechanism 4 in the positive direction in which the crushing / stirring rotary blade 12 side is located obliquely downward as shown in FIG. The crushing / stirring rotary blade 12 is inclined and rotated at a low speed by an inverter in a state where the axis of the shaft 9 that is the rotation axis is inclined to the positive direction side.

  On the other hand, for the crushed and dried raw material having a low water content in the middle of drying and thereafter, the casing 3 is moved by the angle changing mechanism 4 so that the drying / stirring rotary blade 13 side is inclined downward as shown in FIG. The drying / stirring rotary blade 13 is tilted in the opposite direction, and is rotated at a high speed with the axis of the shaft 9 that is the rotation axis tilted in the reverse direction.

  At this time, the blade drive motor 8 sets the ratio of the rotational operation time of the crushing / stirring rotary blade 12 and the drying / stirring rotary blade 13 to, for example, about 2/5 at the time of crushing and stirring and about 3/5 at the time of stirring. In addition, the operation of both the blades 12 and 13 can be controlled by a program, and the optimum operation method according to the raw material can be selected as appropriate.

  Further, as shown in FIGS. 4A and 4B, the other lid portion 6 is detachable from the casing 3, and the lower side of the lid portion 6 is for discharging the processed raw material. A discharge port C2 is provided. And the cover part 6 is holding | maintaining the shaft 9 used as a rotating shaft via the bearing 16 which supports the load of a radial direction.

  FIGS. 4A and 4B show an embodiment in which the other lid 6 is removed from the casing 3. The shaft 9 is held directly through a bearing 16 that supports a radial load. And when removing the other cover part 6 from the casing 3, after inserting the hook-rod-shaped shaft support 17 in the casing 3 via the inspection port C3, and suspending the shaft 9 to the hook part of the front-end | tip. The end portion of the shaft support 17 is fixed to the inspection port C3. If the lid portion 6 is removed in this state, the shaft 9 can be stably held in the center without being brazed in the casing 3, thereby making it possible to easily clean the drying chamber. is there.

  Next, an example of use and operation of the best mode configured as described above will be described. Note that the case where the heat source of the drying device S3 is saturated steam will be described as an example.

  First, the raw material stored in the supply hopper S1 is supplied to the drying device S3 by the raw material pressure pump S2. Saturated steam generated in the boiler S8 is supplied to the drying device S3 through the path of the heating medium supply U1, is heat-exchanged and drained in the drying process, and is discharged through the path of the heating medium discharge U2. At this time, the steam and drain are separated by a steam trap, and the drain is discharged.

  Since some raw materials are viscous and often form dumplings, in the initial drying in the drying apparatus S3, the casing 3 is crushed and agitated with the rotating blade 12 side as shown in FIGS. 3 (a) and 3 (b). After inclining in the forward direction so as to be positioned below, the crushing / stirring rotary blade 12 is rotated at a low speed by an inverter to dry the material while crushing and stirring.

  Since the viscosity becomes low and the raw material easily moves in the drying chamber in the middle of drying, as shown in FIGS. 3 (c) and 3 (d), the casing 3 is positioned so that the drying / stirring rotary blade 13 side is located obliquely below. Then, the rotation is switched to high speed rotation and the drying / stirring rotary blade 13 performs stirring and drying.

  At this time, since the raw material is stirred by the high-speed rotation of the drying / stirring rotary blade 13, the heat transfer efficiency is increased. In addition, the operation of the blades 12 and 13 can be controlled by a program, and an optimal operation method can be selected according to the raw material.

  Moreover, when drying is performed in a vacuum state, the boiling point of the raw material is lowered, and drying at a low temperature is possible. For example, although boiling occurs at about 100 ° C. at atmospheric pressure, the boiling point is as low as about 47 ° C. at 80 torr in vacuum, so that drying at a low temperature becomes possible. In particular, when low temperature drying is required, drying with warm water can be performed.

  The high-humidity air discharged from the drying device S3 by drying passes through the duster S4, collects dust, is condensed in the condenser S5, and is discharged as low-humidity air. At this time, cooling water is supplied to the condenser S5 to condense high humidity air. In the case of vacuum drying, the vacuum pump S7 sucks and discharges. Moreover, although it operate | moves by a normal pressure (atmospheric pressure) depending on a raw material, in that case, it is sucked and discharged by exhaust fan S10.

  When drying is completed, as shown in FIG. 3 (e), the dried raw material is discharged from the discharge port C2 in a state where the casing 3 is tilted in the opposite direction so that the drying / stirring rotary blade 13 side is located obliquely downward.

[BRIEF DESCRIPTION OF THE DRAWINGS] It is a block diagram which shows the drying system which uses the multifunction stirring heat transfer type drying apparatus in the best form for implementing this invention. It is sectional drawing which shows the specific structure of a multifunction stirring heat transfer type drying apparatus. Explaining the use and operation of the multi-function stirring heat transfer type drying device, (a) is a cross-sectional view of the state in which the raw material is crushed and dried in the initial stage of drying, (b) is a partially enlarged view of (a), (C) is a cross-sectional view of the state in which the raw materials are stirred and dried at high speed in the middle stage of drying and thereafter, (d) is a partially enlarged view of (c), and (e) is discharging the processed raw materials. It is sectional drawing of a state. The structure of the cover part provided in the drying chamber one end similarly in a multifunctional stirring heat transfer type drying apparatus is shown, (a) is sectional drawing of the state before removing a cover part, (b) is the state of the state which removed the cover part It is a front view of a drying chamber.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base 2 Supporting shaft 3 Casing 4 Angle change mechanism 5 Lid part 6 Lid part 7 Heat-medium jacket 8 Blade drive motor 9 Shaft (rotary axis)
DESCRIPTION OF SYMBOLS 10 Drive side bearing 11 Shaft seal 12 Crushing / stirring rotary blade 13 Drying / stirring rotary blade 14 Notch 15 Crushing blade 16 Bearing 17 Shaft support

Claims (8)

  In the initial stage of drying when a raw material having a high water content is added, the raw material is crushed and stirred by the low-speed rotation of the crushing / stirring rotary blade with the rotating shaft tilted so that the crushing / stirring rotary blade side is positioned downward. For the crushed and dried raw materials with low water content in the middle and after the drying, the drying chamber is tilted so that the drying / stirring rotary blade side is positioned below the drying / stirring. A multi-function stirring heat transfer type drying method characterized in that stirring drying is performed by high-speed rotation of rotating blades.   The crushing / stirring rotary blade and the drying / stirring rotary blade can be tilted around a fulcrum shaft between a tilted position in the forward direction and a tilted position in the reverse direction, and can be rotated around the same axis. The multi-functional stirring heat transfer type drying method according to claim 1, wherein   The inclination angle in the forward direction of the drying chamber at the time of crushing and stirring is usually 15 ° to 30 °, and the inclination angle in the reverse direction at the time of stirring is usually 30 ° to 75 °. The angle can be freely set according to the application. The multi-functional stirring heat transfer type drying method according to claim 2.   The multi-function stirring heat transfer type drying method according to any one of claims 1 to 3, wherein cleaning of the drying chamber after use is performed by opening one end of the drying chamber.   A crushing / stirring rotary blade on one side of a single rotating shaft and a drying / stirring rotary blade on the other side are arranged side by side so as to be rotatable and tiltable, and both blades are provided in a drying chamber surrounded by a heat medium jacket. A multi-function stirring heat transfer type drying apparatus characterized by that.   The multi-function stirring heat transfer type drying according to claim 5, wherein the crushing / stirring rotary blade and the drying / stirring rotary blade are inclined by tilting the drying chamber itself in either the forward or reverse direction. apparatus.   The crushing / stirring rotary blade has a notch at the tip thereof, and a crushing blade is provided on the heat transfer surface on the periphery of the drying chamber facing the notch. Multi-functional stirring heat transfer type drying device.   The multifunction stirring heat transfer system according to any one of claims 5 to 7, further comprising a detachable lid at one end of the drying chamber, the lid holding a rotating shaft via a bearing. Drying equipment.

Images