JPS6020075A - Method of drying content in hopper drier and hopper drier - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Field of Application of the Invention] The present invention relates to a method for drying contents in a hopper dryer and a hopper dryer. The present invention relates to the above-mentioned method and dryer configured to aerate a gas for use.

[Prior art]

The dryer is configured to temporarily stock powder and granular material and dry it by passing a drying gas such as dry air while stocking the material. For this reason, a conventional hopper dryer includes a body having an inlet and an outlet, and a nozzle for blowing dry air.

However, conventional hopper dryers have the following problems.

As shown in Fig. 1(a), in a conventional hopper dryer, the moving speed increases from the point where the angle of repose is high to the center C, and the contents fed into the center C are transferred to the peripheral area R (body 1
The contents placed in the vicinity of the inner circumferential surface of No. 2 are also quickly discharged. (In Figures 1 (=) and (b), raw materials that were introduced at the same time (or the same time range) are shown with the same pattern.) In this way, materials with long and short residence times in the fuselage Σ exists, but when designing a hopper dryer, it is necessary to select specifications such as layer height and barrel diameter so that the contents, which are discharged as quickly as possible, remain in the barrel for a predetermined required time.

However, if the specifications of the shell are determined so that the contents of the central part C, which are discharged as quickly as possible, stay for a predetermined required time, the contents put into the peripheral part R will stay in the shell for a much longer time than the required retention time. As a result, the average residence time of all contents becomes unnecessarily long.

In addition, in conventional hopper dryers, the weight of the stacked contents is constantly added to each particle, as shown in Figure 2 (a). Therefore, the contents N can be easily tightened. Therefore, the drying air A must flow only through the channels formed in specific portions of the contents N, resulting in extremely poor drying efficiency and a significantly long time required to completely dry the contents. As a result, the thickness of the body becomes unnecessarily large, resulting in disadvantages such as an increase in installation space and an increase in operating costs.

Furthermore, conventional hopper dryers are unsuitable for drying and storing acicular substances such as fibers and flaky substances such as mica because they tend to form bridges and rat holes. (Bridging, as is well known, is a phenomenon in which the contents form an arch at the upper part of the outlet such as the outlet, preventing the contents from moving downward. Also, a rat hole is a phenomenon in which the contents form an arch at the upper part of the outlet, etc. (This is a phenomenon in which only substances located directly above the cylinder (cylindrical area) are discharged, and substances located in other areas are hardly discharged.) [Object of the Invention] The purpose of the present invention is to solve the problems of the above-mentioned prior art. To provide a method for drying contents of a hopper dryer and a hopper dryer, in which the contents are moved evenly, the residence time is uniform, and the drying efficiency is high.

[Structure of the invention]

In order to achieve this object, the present invention is configured to apply a vibration including a vertical component to the contents of a hopper dryer while passing drying gas through the hopper dryer.

The vibration including the vertical component may be not only the vibration in the vertical direction but also the vibration in the diagonal direction.

However, when ventilation is applied while applying such vibrations, each particle (or fibrous material, etc.) of the contents N collides with each other and separates from each other due to the vibration, as shown in Figure 2 (b).
A suitable gap is formed between them. Therefore, the drying gas (for example, dry air; however, in the present invention, the type of gas is not limited to air, and any type of gas may be used as long as it can dry the contents.) A should pass evenly between the contents. This will result in faster drying.

In addition, the fact that each particle (or fibrous material, etc.) of the contents vibrates means that the relative speed between these particles and the drying gas increases, and this factor further enhances drying and increases drying efficiency. This is a marked improvement.

In addition, by applying vibration, the angle of repose of the contents collapses as well as drying is carried out well, and as shown in Fig. 1(b), - is #1 in both the center C and the peripheral area R. The contents N move at a uniform speed and are discharged uniformly.

[Embodiments of the invention]

Embodiments of the hot dryer according to the present invention will be described below with reference to the drawings.

FIG. 3 is a schematic cross-sectional view of a dryer according to an embodiment of the present invention.

Reference numeral 12 denotes a body constituting the hopper main body, which is provided with an input port 14 at the top and a discharge port 16 at the bottom. Rotary pulp for discharge 24
is connected. The body 12 is generally cylindrical and has an inverted conical lower part.

26 is a nozzle for blowing drying gas, one end of which penetrates into the interior of the body 12 through the lower side wall of the body 12;
It reaches the central axis of the body 12, is bent upward, and is opened to blow out gas upward.

A drying gas supply line 28 is connected to the other end of the nozzle 26 .

On the other hand, a gas exhaust line 30 is connected to the upper part of the body 12 to exhaust gas after drying the contents.

A vibrator 32 is attached to the body 12 to cause the body 12 to vibrate.

The raw material introduced into the body 2 via the rotary valve 22 is deposited in the body as shown in FIG. 1(b).

On the other hand, drying gas is supplied into the body from the nozzle 26. The fuselage 12 is still vibrated by the exciter 32.

Then, as described above, voids are formed between each particle (or fibrous material, etc.) of the contents, and the gas blown from the nozzle 26 passes through these voids, and the contents are evenly dried. . In addition, due to the vibration, the contents move downward at approximately the same speed in both the center and the periphery, allowing them to be discharged uniformly.

The dried contents are discharged through the outlet 16 and the rotary valve 24.
It is then discharged. On the other hand, the humid drying gas is discharged from the gas discharge line 30.

In this way, the contents are quickly dried, the contents are uniform (
That is, the central and peripheral contents are evacuated at approximately the same rate. This also makes it possible to reduce the capacity of the fuselage 12, and eliminates the disadvantages of unnecessary enlargement of the fuselage.

A roof-shaped member 34 called a jinkasa is disposed directly below the input port 14, and is configured to distribute and supply the input raw material evenly in the cross-sectional direction of the body.

A roof-shaped member 36 is also installed at a position immediately above the outlet 16. This member 36 serves to prevent the weight of the contents accumulated in the body 12 from directly applying to the contents in the vicinity of the discharge port 16, and to prevent the contents from becoming compacted in the vicinity. . Note that this member 36 may be made of a perforated plate as described later.

In the embodiment shown in FIG. 3, since the body 12 is small, the body 12 is designed to vibrate as a whole.

In the embodiment shown in FIG. 4, since the body 12 is large, the lower part of the body 12 is configured to vibrate.

That is, the body 12 is divided into an upper body 12A and a lower body 12B, and the separate body lower body 12B is connected to the body upper body 1 through a flexible member (flexible shell in this embodiment) 38.
Connected to 2A. And the exciter 32 is the lower part of the fuselage 1
It is attached to 2B.

In this embodiment, when the exciter 32 is actuated, the lower body 12B mainly vibrates, and this vibration is transmitted to the contents inside the body 12, thereby quickly drying the contents in the same manner as in the embodiment shown in FIG. , uniform discharge takes place.

The rest of this embodiment is the same as the embodiment of FIG. 3, except for the roof 36. In this embodiment, the roof-shaped member 36 is a perforated plate, and the air blown out from the nozzle 26 is dispersed by the perforated member 36 so that it is supplied more evenly into the fuselage 12. This further increases the drying rate of the contents.

In this embodiment, only the lower part of the body 12B is vibrated, and the energy required for the vibration is small, making it less expensive. In addition, a small-capacity exciter is sufficient.

The embodiment of FIG. 5 has a mesh member 40 inside the fuselage 12.
is installed in the direction across the fuselage. In general, in the case of contents having uneven particle sizes, the larger the particle size, the faster the particle moves and the residence time tends to be shorter.

When the mesh member 40 is provided as in this embodiment, the larger the diameter of the contents, the more the mesh member 40 obstructs the movement of the contents. (On the contrary, the smaller the diameter, the easier it is to pass through the mesh member 40.) Therefore, the above-mentioned tendency is alleviated, and the large and small diameter objects move at almost the same speed, and are discharged extremely uniformly. As a result, it becomes possible to

Note that the other configurations are the same as the embodiment shown in FIG.
It has a similar effect to the one shown.

In the embodiment shown in FIG. 6, a perforated plate 42 is provided at the bottom of the body 12 in the gas supply nozzle, and drying gas is blown into the body 12 from a ventilation chamber 44 through the perforated plate 42. ing.

In this way, the drying gas is evenly supplied to the entire cross section within the body, and the contents are dried more evenly. In this embodiment, the roof-shaped member 36 may be a perforated plate, or a mesh member 40 may be provided as in the embodiment shown in FIG.

The rest of the structure is the same as that of the embodiment shown in FIGS. 4 and 5, and the same effects can be obtained. In the embodiment of FIG.
A vibrator 32 is installed inside the fuselage 12 and is configured to cause the roof-shaped member 36 to vibrate. In this embodiment, since the roof-shaped member 36, which is small in size as well as the body, is vibrated, the effect is that the energy required for vibration is even smaller.

In this embodiment, the roof-shaped member 36 is a perforated plate, but it may also be a non-perforated plate as shown in FIG. The mesh member 40 may also be installed as in the embodiment shown in FIG.

Note that the other configurations are the same as those of the embodiment shown in FIG. 3, and the same effects can be achieved.

FIG. 8 shows a modification of the embodiment shown in FIG. 7 in which a perforated plate 42 is provided at the bottom of the body 12, and drying gas is supplied into the body through this perforated plate 42, so that the gas is more uniformly supplied to the body. The contents are dried evenly.

Note that the other configurations are the same as the embodiment shown in FIG. 7, and the same effects can be achieved.

〔Effect of the invention〕

As described above, in the present invention, the drying gas is ventilated while applying vibration including a vertical component to the contents, so that the contents in the center and the contents near the inner peripheral surface of the fuselage are almost the same. It moves quickly and is ejected evenly. Furthermore, the contents can be dried extremely quickly, the drying efficiency is high, and the cost of heat energy required for drying is greatly reduced. Furthermore, these effects bring about various excellent effects such as the capacity of the body being small, the manufacturing cost being reduced, and the installation space required.

It can also be applied to needle-like substances and flaky substances.

[Brief explanation of the drawing]

Figure 1 (aL (b) is a sectional view showing the movement of the contents, Figures 2 (a) and (b) are schematic diagrams showing the flow of gas passing through the contents, Figures 3 to 3) Fig. 8 is a schematic cross-sectional view of the hopper dryer according to each embodiment. 12... - body, 14... input port, 16... discharge port, 26... nozzle, 38... Flexible shell, 40...mesh member. Agent Patent attorney Tsuyoshi Shigeno Figure 1 ((1) (b) Figure 2 (a) (b) Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] (11) The contents having moisture introduced into the body from the upper part of the hopper and the lyre are dried by the drying gas supplied into the body from the lower part of the body, and the contents are dried from the bottom of the body. A method for drying contents in a hopper dryer, characterized in that, in the hopper dryer for discharging, the drying gas is ventilated while applying vibrations including a vertical component to the contents. a body having an input port and an outlet at the bottom; a drying gas blowing means provided at the bottom of the body;
A hopper dryer comprising: an exciter for body vibration attached to the body. (3) the lower part of the fuselage is separate from the upper part of the fuselage;
The hopper dryer according to claim 2, wherein the lower body is connected to the upper body through a flexible member, and the exciter is attached to the lower body. . (4) A roof-shaped member for preventing load concentration on the outlet is provided in the lower part of the interior of the body and above the outlet. Hopper dryer as described in section. (5) The second aspect of the present invention is characterized in that a mesh member is provided inside the body in a transverse direction.
The hopper dryer according to any one of Items 1 to 4. (6) A body having an inlet at the top and an outlet at the bottom, a nozzle for supplying drying gas provided at the bottom of the body, and a diaphragm horizontally installed in the lower part of the interior of the body. , and a drive device for the diaphragm. (7) The hopper dryer according to claim 6, wherein a mesh member is provided inside the body in a transverse direction.