JP2004053183A - Horizontal rotary dryer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stably discharge a dried matter while preventing the tangle with a gas blown into a rotary cylinder. <P>SOLUTION: This horizontal rotary dryer comprises the rotary cylinder 10 rotatable around a shaft center direction, and dries a matter to be dried in the rotary cylinder through external heating during a process to discharge the dried matter charged from one end side of the rotary cylinder 10 while rotating the rotary cylinder 10, from the other end side. The other end side of the rotary cylinder 10 has an outlet part 20 opened to an outer part in the other end direction, a dried matter discharge port 31A and a gas blow-out port 32A for blowing the gas into the rotary cylinder 10 are respectively communicated to openings 21, 22 of the outlet part 20, a partition 23 for partitioning an inner side and an outer side is mounted on the outlet part, and the outer side and the inner side of the partition 23 are respectively provided with blades 24 for sending out the dried matter toward the opening 21. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a horizontal rotary dryer in which a rotary cylinder is rotatably supported.
[0002]
[Prior art]
A typical example of a conventional horizontal rotary dryer is a so-called steam tube dryer.
[0003]
As illustrated in FIG. 3, the steam tube dryer includes a rotating cylinder 110 that is rotatable around the axial direction, and rotates the rotating cylinder 110 to remove an object to be dried loaded from one end of the rotating cylinder 110. In the process of discharging from the other end side, drying is performed in the rotary cylinder 110 by heating steam as external heat for drying.
[0004]
More specifically, the rotating cylinder 110 has a length of, for example, 10 m to 30 m. In the rotating cylinder 110, steam heated by using wet powder or granular powder as a heat medium is connected to a heating pipe 111. While being dried by being brought into contact with the rotary cylinder, the rotary cylinder is continuously moved while being sequentially moved to the discharge port 112 as the rotary cylinder rotates.
[0005]
Therefore, the rotary cylinder 110 is installed with a slight downward slope in order to smoothly transfer the raw material from the raw material (dry product) inlet 121 at one end to the dry product discharge port 112. The rotating cylinder is supported via tires 114, 114 on bearing rollers 130, 130 provided on the two bases 131, 131, respectively. , 131 and the height and angle of the bearing rollers 130, 130.
[0006]
On the other hand, in order to rotate the rotary cylinder 110, a driven gear 150 is provided around the rotary cylinder 110, and a driven gear 153 meshes with the driven gear 150, and the rotational force of the prime mover 151 is transmitted through the speed reducer 152. Then, the rotary cylinder rotates around its axis.
[0007]
Further, in the steam tube dryer, a number of heating tubes 111 are arranged between both end plates of the rotating cylinder in parallel with the axis, and heated steam as a heat medium is attached to the rotating joint 160 to these heating tubes 111. After being supplied through the supplied heat medium inlet pipe 161 and flowing through the respective heating pipes 111, it is discharged through the heat medium outlet pipe 162.
[0008]
On the other hand, a gas inlet 113 is provided at the end of the rotary cylinder 110 so as to communicate with the outlet 112, and the gas is exhausted from the gas outlet 122 on the other end together with the evaporative gas in the rotary cylinder 110. It has become so.
[0009]
This type of horizontal indirect heating dryer has the feature that the heating area per volume is large, the drying capacity is large, the heat transfer efficiency is high, and further, no exhaust gas treatment equipment is required, and the operation is easy. It is widely used because it has certain advantages.
[0010]
[Problems to be solved by the invention]
However, it has been found that it is necessary to keep the inside of the rotating cylinder under pressure when drying the object to be dried, which may change its physical properties when outside air enters the rotating cylinder. In addition, it has been found that not only the contact between the heating pipe 111 and the object to be dried but also the drying efficiency is increased by charging the heating gas into the rotating cylinder.
[0011]
In addition, since excessive retention of the dried product in the rotating cylinder causes deterioration of physical properties, a stable discharge speed is required. However, as shown in FIG. 3, when the dried product is guided from the inside of the rotary cylinder 110 to the discharge port 112 by natural fall, the discharge stability is lacking.
[0012]
By the way, as described above, when the heating gas is supplied into the rotating cylinder, the drying efficiency is increased. In this case, it is necessary to reuse the gas discharged together with the dried material from the viewpoint of cost. desirable. In reusing, it is desirable to remove as much as possible the powder derived from the dry matter in the re-supplied heating gas.
For example, when dusts derived from dry matter mixed in the gas charged in the heating gas passage accumulate in the gas inflow passage, a part or all of the inflow passage is blocked, thereby hindering the operation of the dryer. Because it can cause
[0013]
Accordingly, a main object of the present invention is to provide a horizontal rotary dryer capable of discharging and collecting dried matter mixed in a re-supplied heating gas.
[0014]
[Means for Solving the Problems]
The present invention that has solved the above problems is as described below.
<Invention according to claim 1>
A rotating cylinder that is rotatable around the axial direction is provided. In a process of discharging the object to be dried loaded from one end of the rotating cylinder from the other end while rotating the rotating cylinder, the rotating cylinder is heated by external heat for drying. A horizontal tumble dryer that dries inside,
The other end of the rotary cylinder has an outlet opening outward in the other end direction, and communicates with the openings of the outlets to discharge gas to the outlet of the dried product and the rotary cylinder. A horizontal rotary drier having a gas inlet, a gas passage for the gas in the outlet, and a means for discharging a dried product in the gas passage.
[0015]
(Effect)
In the present invention, since the drying means for the dried substance is provided in the gas passage, when the heated gas is reused, the dried substance contained in the gas or the dried substance entering the gas passage through the opening is removed. Blockage of the gas passage due to deposition is prevented.
[0016]
<Invention according to claim 2>
In the outlet, there is a partition partitioning the inside and the outside in the radial direction from the axis, and the outside of the partition is a delivery passage through which dried matter is delivered toward the opening, and the inside is a gas passage. The horizontal tumble dryer according to claim 1, wherein:
[0017]
(Effect)
In the present invention, since a gas injection port for blowing gas into the rotary cylinder is provided, for example, when drying an object to be dried whose physical properties may change when outside air enters the rotary cylinder, By keeping the inside of the rotary cylinder under pressure by blowing gas, it is possible to prevent a change in physical properties due to invasion of outside air. In addition to the contact between the heating tube and the object to be dried, the drying efficiency is increased by charging the heating gas into the rotary cylinder through the gas inlet.
[0018]
On the other hand, the direction in which the gas is blown into the rotary cylinder and the direction in which the dried matter is sent out toward the opening have a countercurrent relationship. As a result, the delivery of the dried product is not performed smoothly. Therefore, according to the present invention, the inside of the outlet portion is partitioned into the inside and the outside by the partition wall, the outside of the partition wall is used as a delivery passage through which the dried product is delivered toward the opening, and the inside is used as the gas flow path, so that the dried product is formed. The gas can be blown in irrespective of the delivery of the dried product, and on the contrary, the delivery of the dried product can be performed smoothly.
[0019]
<Invention of Claim 3>
The horizontal rotary dryer according to claim 1, wherein the discharge unit is a ribbon screw having a direction of the outlet portion as a delivery direction.
[0020]
(Effect)
Since the discharging means is a ribbon screw disposed on the partition wall and facing the outlet, the dried product can be discharged without obstructing the supply of gas into the rotating cylinder.
Further, since the other end direction of the rotary cylinder is set as the sending direction, it is easy to collect the discharged powder.
BEST MODE FOR CARRYING OUT THE INVENTION
The horizontal rotary dryer according to the present invention will be described in more detail with reference to FIGS. 1 and 2 by taking a rotary steam dryer as an example.
[0022]
The rotary steam dryer 1 of the present invention includes a heating pipe 11 that heats a wet powder or a granular powder supplied from an inlet at one end side by a heating medium (for example, heating steam) in a rotating rotary cylinder 10. Since the rotating cylinder 10 is installed with a downward slope while being contacted and dried, the rotating cylinder 10 is sequentially moved to the other end side and continuously discharged from the discharge port. A large number of the heating tubes 11 are arranged between the end plates at both ends of the rotary cylinder 1 in parallel with the axis. Steam is supplied to these heating tubes 11 as a heat medium, and the heating tubes 11 are covered in the rotary cylinder 10. Heat exchange with the dried product.
[0023]
The object to be dried is charged into the rotary cylinder 10 from a charging inlet via a charging chute, for example. One end of the charging chute is inserted into the rotary cylinder 10 through an opening formed at the center of the charging-inlet-side end plate, and the material to be dried supplied from the charging port slides down the charging chute by gravity. The rotary cylinder 10 is inserted into the rotary cylinder 10. The rotary cylinder 10 is rotatably connected to a fixed throwing chute. The form of the insertion portion may be the same as that shown in FIG. 3, or may be another known form.
[0024]
The rotating mechanism of the rotary steam dryer 1 may have the same configuration as that of FIG. 3, or may have another known configuration.
[0025]
On the other hand, as shown in FIGS. 1 and 2, at the other end side (dry matter discharge side) of the rotary cylinder 10, the other end direction (in FIG. (Right direction) A dried product outlet 20 having openings 21 and 22 on the outside is integrally provided.
[0026]
A discharge casing 31 having a gas discharge port 31B for blowing the gas G into the rotary cylinder 10 and a discharge port 31A for the dried product is provided in communication with the outlet section 20 to the openings 21 and 22, respectively. I have.
[0027]
As the gas G, an appropriate gas such as air or an inert gas can be selected, and the blowing pressure is desirably blown by pressurization from the viewpoint of preventing outside air from entering. The gas is finally discharged from the dry material discharge port 31A together with the material to be dried, for example, the gas discharge port 122 on the inlet side of the material to be dried or the dried material. It is returned to the blowing port 31B and reused.
[0028]
The outlet 20 has a partition 23 for partitioning the inside and the outside. The outside of the partition 23 is defined as a delivery passage L1, and the inside is defined as a gas passage L2. , A screw blade 24 in the embodiment, and a ribbon screw R for similarly sending the dried material toward the opening 21 in the gas passage. The blades of the delivery passage L1 may be, for example, paddle-shaped blades instead of the screw blades 24, or may be a delivery passage simply formed by a space without providing any blades.
[0029]
The discharge casing 31 is narrowed toward the lower end when viewed from the side, and has a shape similar to a hot air balloon shape. The discharge casing 31 is sealed by a seal portion 91 interposed between the discharge casing 31 and the outer surface of the outlet portion 20.
[0030]
On the other hand, a steam path is provided integrally with the rotary cylinder 10, which penetrates through the discharge casing 31, extends into the partition wall 23, and faces the same, and the steam supply pipe 61 of the steam S and the drain discharge pipe 62 are coaxial. ing. The steam supply pipe 61 communicates with the inlet header of the heating pipe 11 in the end plate 12, and the drain discharge pipe 62 communicates with the outlet header of the heating pipe 11 in the end plate 12. Further, the steam supply pipe 61 and the drain discharge pipe 62 communicate with a steam supply pipe 64 and a drain discharge pipe 65 via a rotary joint 63, respectively. These communication pipes have a function as a support member for the steam path and are also supported by a support member 66.
[0031]
On the other hand, the discharge casing 31 is sealed by a seal portion 92 interposed between the discharge casing 31 and the outer surface of the drain discharge pipe 62.
[0032]
In this embodiment, as shown in FIG. 1, the gas G is sent into the inside of the partition wall 23 from the gas blowing port 31 </ b> B at the upper part of the discharge casing 32. Since the gas G also contains a reuse gas, dust and the like derived from dry matter are also included. However, the gas G is charged into the inside of the partition wall, that is, the gas passage L2. Since the ribbon screw R is disposed as described above, dust and the like derived from a dried substance mixed in the gas are hit and captured by the ribbon screw R. On the other hand, in the present embodiment, the ribbon screw R is fixed to the partition wall by welding, and the central portion of the gas passage, that is, the vicinity of the drain discharge pipe 62 is hollow. Therefore, the gaseous gas G passes through the hollow portion and is not hindered by the ribbon screw R but is charged into the rotary cylinder, and the powder contained in the gas G is captured by the ribbon screw R in the process. On the other hand, since the ribbon screw R rotates with the rotation of the rotary cylinder, the dried matter captured by the ribbon screw R is sent toward the opening 21 by the feeding operation of the ribbon screw R, and is discharged. It is discharged into the casing. The discharged dried matter is discharged from the discharge port 31A below the discharge casing by free fall.
[0033]
On the other hand, with the rotation of the rotary cylinder 10, the screw blade 24 also rotates around the axis, so that the dried product is sent toward the opening 21 by the feeding action of the screw blade 24 and discharged from the opening 21. Eventually, it is dropped into the discharge casing 31 by its own weight, and is discharged out of the machine from the discharge port 31A. Since the opening 21 and the opening 22 are substantially partitioned by the partition wall 32C, the gas G to be blown is less affected by the gas G and is smoothly discharged.
[0034]
【The invention's effect】
As described above, according to the present invention, there is provided a horizontal rotary drier capable of capturing and discharging dried matter mixed in a heated gas.
[Brief description of the drawings]
FIG. 1 is a schematic longitudinal sectional view showing a horizontal rotary dryer according to the present invention.
FIG. 2 is a side view thereof.
FIG. 3 is a conceptual perspective view of a horizontal rotary dryer.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Steam dryer, 10 ... Rotating cylinder, 11 ... Heating tube 21, 22 ... Opening part, 23 ... Partition wall, 24 ... Screw blade, 31 ... Discharge casing, 31A ... Discharge port, 32 ... Feeding casing, 32A ... Gas blowing Entrance, 32C: partition wall, 50: gantry, 63: rotary joint, 70, 80: stopper and deformation preventing means.

Claims (3)

A rotating cylinder that is rotatable around the axial direction is provided. In a process of discharging the object to be dried loaded from one end of the rotating cylinder from the other end while rotating the rotating cylinder, the rotating cylinder is heated by external heat for drying. A horizontal tumble dryer that dries inside,
The other end of the rotary cylinder has an outlet opening outward in the other end direction, and communicates with the openings of the outlets to discharge gas to the outlet of the dried product and the rotary cylinder. A horizontal rotary drier having a gas inlet, a gas passage for the gas in the outlet, and a means for discharging a dried product in the gas passage. In the outlet portion, there is a partition partitioning the inside and the outside in the radial direction from the axis, and the outside of the partition is a delivery passage through which dried matter is delivered toward the opening, and the inside is a gas passage. The horizontal tumble dryer according to claim 1, wherein: The horizontal rotary dryer according to claim 1, wherein the discharge unit is a ribbon screw having a direction of the outlet portion as a delivery direction.

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