JP4318082B2 - Stir dryer - Google Patents

Description

The present invention relates to an agitation and drying apparatus that uses, as a raw material, solid particulates such as coal, limestone, or slag containing moisture such as rainwater, and crushes or crushes by stirring while drying surface moisture. In particular, the present invention relates to a raw material stirring and drying apparatus that efficiently performs stirring and drying simultaneously while blowing hot hot air onto a material to be dried by a gas dispersion plate.

Conventionally, as an apparatus for efficiently drying a material to be dried by ejecting high-temperature hot air from a gas dispersion plate at a high flow rate, for example, a solid granular material as disclosed in Patent Document 1 These drying devices are known.
Japanese Utility Model Publication 1-158094

  According to the conventional drying apparatus disclosed in Patent Document 1, when a raw material that is an object to be dried is supplied into the drying chamber from a raw material supply port arranged in the drying chamber, the raw material is ejected from the air chamber into the drying chamber. In addition to being fluidized by the high-temperature hot air generated, it is dried while being moved in the direction of the paddle shaft by the action of the paddle while being stirred up by the rotation of the paddle shaft.

Moreover, according to the conventional drying apparatus by patent document 1, even if a to-be-dried object contains the lump which adhered, for example by aggregation, etc., it can loosen it by the action of a paddle. (In the present invention, loosening the raw material may be referred to as crushing).
The material to be pulverized is loosened and broken by being agitated in a paddle, and the contact rate between the loosened particles and hot air is improved, so that it is smoothly fluidized and dried efficiently. To be done.

Here, in the conventional drying apparatus described above, the raw material is fluidized in the drying chamber by a hot gas (hot air in the case of Patent Document 1) ejected from the opening on the slit at a high speed, and is dried.
However, when considering the crushing effect of the paddle installed in the drying chamber, the fluidization of the raw material as described above may cause a problem of reducing the crushing effect of the paddle. Therefore, when there are a lot of aggregates and the like in the raw material, there arises a problem that the raw material that is not sufficiently crushed is taken out of the apparatus.

  The present invention has been made in view of the above-mentioned drawbacks of the prior art, and even when the raw material as the material to be dried is a large lump with a high content of moisture in which particles are adhered to each other, the lump is sufficiently removed. It is an object of the present invention to provide a stirring and drying apparatus that can be scraped and dried efficiently.

The stirring and drying apparatus according to the present invention includes:
(1) It has a paddle shaft provided with a plurality of paddles so as to be freely rotatable, and provided with a raw material supply port and an outlet on one end side and the other end side of the paddle shaft, respectively. A lower portion of the stirring chamber is provided by a gas dispersion plate that includes a stirring chamber having a gas discharge port formed above the outlet and a blower chamber disposed below the stirring chamber, and extends along the longitudinal direction of the paddle shaft. In the raw material agitation drying apparatus, the raw material supplied to the stirring chamber is dried while being stirred by supplying hot gas from the blower chamber to the stirring chamber through the gas dispersion plate. A gas introduction port is provided in the space portion of the air blowing chamber located below the opening, and the space portion of the air blowing chamber located below the outlet and the space portion on the side where the gas introduction port of the air blowing chamber is arranged A flow rate adjusting plate is arranged between them, and the two space portions are connected by the flow rate adjusting plate. An opening area per unit area by a gas hole formed in a gas dispersion plate arranged on the raw material outlet side with the flow rate adjusting plate as a boundary , with the passage portion being left as a boundary, the raw material supply port It formed so that it might become larger than the opening area per unit area by the gas hole formed in the gas distribution board distribute | arranged to the side.

(2) In the stirring / drying apparatus according to (1), the paddle has a flat plate shape, and the paddle of the outlet portion is attached in parallel to the axis of the paddle shaft, and the other paddles are attached to the paddle shaft. It was tilted with respect to the axis.

The present invention having the above-described configuration is achieved by reducing the amount of hot gas blown up from the gas dispersion plate in the vicinity of the raw material outlet portion by using a flow rate adjusting plate arranged in the blower chamber as compared with other parts. In addition, it suppresses the fluidization of the raw material and forms a crushing zone that emphasizes the crushing effect.
And according to this invention which formed this crushing zone, a raw material can fully be stirred and crushed in a crushing zone, and the reduction | decrease of the crushing effect by fluidization which was a problem of the prior art is suppressed. Can do.

  Further, if the area of the opening provided in the gas dispersion plate is increased in the crushing zone, the flow rate of the gas passing through the opening can be reduced even if the amount of gas blown out is the same. It is possible to increase the crushing effect by suppressing fluidization.

  In addition, as a method of forming an opening in the gas dispersion plate, a method of forming a slit is easy to process, and the opening area per unit area can be easily adjusted according to the number of slits. It is.

FIG. 1 is a longitudinal sectional view showing an embodiment of a stirring and drying apparatus according to the present invention. FIG. 2 is a side sectional view taken along line A in FIG. 1 is a top view of FIG. 1, and FIG. 4 is a side sectional view taken along line B of FIG.

As shown in FIG. 1, the stirring and drying apparatus 1 includes a gas dispersion plate 2 at a substantially central portion in the height direction, and includes a stirring chamber 3 at an upper portion and a blower chamber 4 at a lower portion.
The bottom plate 30 of the stirring chamber 3 is formed in a bowl shape with a partial semicircular cross section as shown in FIG. 2, and the gas dispersion plate 2 is disposed on the central arc portion.

A refractory 43 is lined on the inner wall surface of the air blowing chamber 4 including the back surface of the bottom plate 30 and is protected against high-temperature hot air. The refractory 43 is also applied to the gas dispersion plate 2, and the slit 20 or a part of the slit 21 as an opening as the gas hole is formed of the refractory 43.
In the present embodiment, the refractory 43 is used for the lining, but it is needless to say that the refractory may not be used depending on the temperature of the gas used.

In the stirring chamber 3, a paddle shaft 5 is rotatably supported by bearings 50 attached to both outer walls of the stirring chamber 3 via brackets. In this embodiment, six) paddles 51 for stirring are attached at substantially equal intervals.
Each of the paddles 51 has an arm 51a penetrating the paddle shaft 5, and is detachably attached to the paddle shaft 5 by screwing a nut 51b from both rules and tightening the screw 51 of the arm 51a with the paddle shaft 5 interposed therebetween. Installed on.
The means for attaching the paddle 51 to the paddle shaft 5 is not limited to the means described in the present embodiment. For example, the attachment rib of the paddle 51 is fixed to the paddle shaft 5 in advance by welding or the like. It is possible to use means such as bolting the paddle 51 to the ribs, and any other means may be used as long as it does not impair the function and effect of the present invention. Needless to say, it is within the scope of adaptation.

The paddle 51 is formed in a flat plate shape so as to scrape the raw material as a material to be dried by the rotation, and its tip is bent in the paddle rotation direction to make the raw material scraping more reliable. Yes. The tip of the paddle 51 is set at a position close to the bottom plate 30.

The paddles 51 are attached such that the paddles 51 adjacent to each other in the direction of the paddle shaft 5 have different attachment angles in the axial direction. In the present embodiment, the paddles 51 adjacent to each other in the axial direction are attached with their mounting angles in the circumferential direction being sequentially shifted by 120 degrees (see FIG. 2).

Further, the paddle 51 is attached to be inclined with respect to the axis of the paddle shaft 5 and is set to about 10 degrees in the present embodiment. The paddle 51 has an effect of moving the raw material to be dried in the paddle axis direction by this inclination.

  In the present embodiment, the four paddles 51 on the supply port 31 side are attached so as to be inclined with respect to the axis of the paddle shaft 5, and the two facing the side wall of the outlet 32 are the paddle shaft 5. It is set parallel to the axis of

In the present embodiment, the supply port 31 is provided in the upper part of the stirring chamber 3 on one end side of the paddle shaft 5, and the dried raw material is formed on the side wall of the stirring chamber 3 on the other end side of the paddle shaft 5. An outlet 32 is provided.
As shown in FIG. 2, the lower end portion 32b of the attachment opening 32a of the outlet 32 on the side wall of the stirring chamber 3 is formed so as to substantially coincide with the starting end portion of the partial semicircular bottom plate 30.

  Further, a gas introduction port 41 is provided in the side wall of the air blowing chamber 4 located below the raw material supply port 31, and the dried hot air is exhausted on the upper wall on the side where the outlet 32 of the stirring chamber 3 is located. An outlet 42 is provided.

Here, in the present embodiment, the flow rate adjusting plate 25 is arranged between the space portion of the air blowing chamber 4 located below the outlet 32 and the space portion of the air blowing chamber 4 on the side where the gas inlet 41 is arranged. is doing.
The flow rate adjusting plate 25 is a flat plate member whose upper end is fixed to the gas dispersion plate 2 and is arranged so as to partition the air blowing chamber 4 into two parts. The lower part of 4 is not reached, but there is a gap, and the communication part is left and is partially partitioned.
Therefore, the gap between the air inlet 41 side of the blower chamber 4 and the lower side of the outlet 32 of the blower chamber 4 is provided between the flow rate adjusting plate 25 and the bottom of the blower chamber 4, and the gap It is the structure which gas can flow through.

  In the present specification, for ease of explanation, the space part on the gas inlet 41 side of the blower chamber 4 with the flow rate adjusting plate 25 as a boundary is referred to as a first zone X, and the outlet 32 of the blower chamber 4 is also referred to. The lower side is made the second zone Y (sometimes referred to as a crushing zone).

Hereinafter, the configuration of the gas dispersion plate 2 will be described.
The gas dispersion plate 2 is formed by juxtaposing a plurality of elongated slit-like openings in the direction along the arc as shown in FIGS. 1 and 4. In FIG. 1, the slits 20 and 21 are shown by lines.

Here, the portion in the first zone X of the gas dispersion plate 2 has a slit-like opening (referred to as a slit 20) formed as a gas hole in the direction along the arc, and the gas dispersion plate 2 The portion in the second zone X is formed by juxtaposing slit-shaped openings (referred to as slits 21) formed as elongated gas holes.
In this embodiment, the length and width of the slit-shaped openings provided in the first zone and the second zone are the same, but the number of slits 21 provided in the second zone is the same as that in the first zone. Compared with the slits 20 provided, twice the number per unit area was processed.
Therefore, the opening area per unit area of the gas dispersion plate 2 in the second zone is approximately twice the opening area per unit area of the gas dispersion plate 2 in the first zone.

The operation and effect of the case where the stirring and drying device 1 according to the present embodiment having the above-described configuration is operated will be described.
In the present embodiment, a case where coal having moisture adhering to about 10% is used as a raw material will be described.
First, as the first step, coal stored in a raw material bottle (not shown) is supplied into the stirring chamber 3 from the supply port 31 of the stirring and drying device 1 and placed on the first zone X of the gas dispersion plate 2. Heated air (sometimes referred to as hot air) is supplied into the blower chamber 4 from the lower gas inlet 41.

Hot air supplied from the air inlet 41 into the blower chamber 4 flows into the stirring chamber 3 through the gas dispersion plate 2. Here, when a drive current machine (not shown) is driven to rotate the paddle shaft 5 to rotate the paddle 51, the small particle size coal in the first zone X is high-speed from the slit 20 of the gas dispersion plate 2. Is fluidized by hot air sprayed at a high temperature (in the present embodiment, about 600 ° C. or lower) and dried while being moved to the outlet 32 side.

Further, coal in which particles adhere to each other or coal having a relatively large particle size (for example, 50 mm or less) is struck by a flat paddle 51 attached to the rotating paddle shaft 5. The lump is moved toward the take-out port 32 in the paddle axial direction while being loosened, and is loosened little by little during this time or dried while being crushed.

Here, in order for the hot air to reach the second zone Y from the first zone X of the blower chamber 4, it is necessary to pass through a gap that is a communication portion formed below the flow rate adjusting plate 25. Therefore, the amount of hot air that inevitably flows into the second zone Y of the blower chamber 4 is reduced. Therefore, the flow velocity of the hot air blown out from the slit 21 in the second zone decreases as the flow rate of the hot air decreases.

In other words, in the present embodiment, the amount of hot air flowing into the second zone Y can be adjusted by the size of this gap. In the present embodiment, the size of the flow rate adjusting plate 25 is adjusted by the flow rate adjusting plate 25 so that the size of the gap is about 10% of the original flow path area.
It should be noted that the size of the gap is not limited to the size of the gap used in the present embodiment. In each actual operation, the size of the gap is determined by checking the degree to which the raw material is loosened. You can adjust.

  Furthermore, in the present embodiment, the number of slits 21 formed in the second zone Y per unit area is larger than the number of slits 20 formed in the first zone X per unit area. The flow rate of hot air blown out from the air was further reduced.

In the present embodiment, fluidization is suppressed by reducing the flow rate and flow velocity of hot air blown up on the second zone Y of the stirring chamber 3 by the above-described configuration, and coal is strongly stirred by the paddle 51. The
Therefore, even if there is a lump of coal that has not been sufficiently loosened in the first zone, the paddle 51 on the second zone Y is moved to the axial direction little by little while being strongly loosened. Can be crushed or crushed.
Then, the coal that has been crushed and dried in the stirring chamber 3 and reaches the outlet 32 side is finally lifted up to the upper opening 32a by the paddle 51 and discharged from the opening 32a through the outlet 32. .
In addition, the hot air which dried coal is discharged | emitted from the discharge port 42. FIG.

Here, the dryness can be controlled by adjusting the inclination angle of the paddle 51 in the axial direction, the rotational speed, the temperature of the hot air, and the like, and the degree of crushing is controlled by the first zone and the second zone. It can be adjusted by adjusting the opening area formed in the gas dispersion plate 2, the area of the communication portion left by the flow rate adjustment plate 25, and the like.

Therefore, in the present embodiment, not only the predetermined drying degree can be obtained by the stirring and drying apparatus 1, but also the raw material can be sufficiently stirred, and can be crushed or crushed.

It is a longitudinal cross-sectional view which shows one Embodiment of the stirring drying apparatus by this invention. FIG. 2 is a side cross-sectional view taken along line A in FIG. 1. FIG. 2 is a top view of FIG. 1. It is a B sectional view side sectional view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stirring drying apparatus 2 Gas dispersion plate 3 Stirring chamber 4 Blower chamber 5 Paddle shaft 20 Slit 21 Slit 25 Adjustment plate 30 Bottom plate 31 Supply port 32 Outlet 41 Inlet port 42 Outlet port 43 Refractory 50 Bearing 51 Paddle X First zone Y Second zone (sometimes called the crushing zone)

Claims (2)

A paddle shaft provided with a plurality of paddles is provided to be rotatable, and a feed port and a take-out port for the raw material are provided on one end side and the other end side of the paddle shaft, respectively, and above the take-out port for the raw material The lower part of the stirring chamber is formed by a gas dispersion plate that extends along the longitudinal direction of the paddle shaft, and has a stirring chamber having a gas discharge port formed therein and a blower chamber disposed below the stirring chamber. In the raw material stirring and drying apparatus for supplying the hot gas from the air blowing chamber to the stirring chamber through the gas dispersion plate and drying the raw material supplied to the stirring chamber,
A gas introduction port is provided in a space portion of the air blowing chamber located below the supply port, and a space portion on the side where the gas introduction port of the air blowing chamber is disposed below the air outlet. A flow rate adjusting plate is arranged between the two space portions, and the two space portions are partially partitioned by the flow rate adjusting plate leaving a communicating portion ,
With the flow rate adjusting plate as a boundary, the opening area per unit area formed by the gas holes formed in the gas dispersion plate arranged on the raw material outlet side is formed in the gas dispersion plate arranged on the raw material supply port side. An apparatus for stirring and drying a raw material, which is larger than an opening area per unit area by a gas hole . 2. The paddle is in a flat plate shape, and the paddle of the outlet portion is attached in parallel to the axis of the paddle shaft, and the other paddles are attached to be inclined with respect to the axis of the paddle shaft. Stirring and drying equipment.

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