JPH06328011A - Dispersing device - Google Patents

Abstract

PURPOSE:To efficiently disperse flocs of a fine powder by extremely increasing the relative speed of the flocs of the fine powder and high speed air to allow large shearing force to act on the flocs of the fine powder by arranging a high speed air duck on the tangential line of a rotary disc having a fine powder passage formed thereto. CONSTITUTION:The rotary disc 3 arranged in a casing 2 is rotated in an A- direction by a motor and high speed air is allowed to flow in a B-direction within a high speed air duct 1. Whereupon, at a part facing to the interior of the high speed air duct 1 of the peripheral edge part of the rotary disc 3, the moving direction of the notches 7 forming the fine powder passages of the rotary disc becomes reverse to the flow direction of high speed air. When flocs of a fine powder are supplied into the casing 2 from a transport pipe 4, they are guided by the peripheral edge part of the rotary disc 3 to pass through the notches 7 to fall in the high speed air duct 1. Therefore, the relative speed of the flocs of the fine powder and high speed air is extremely increased and large shearing force acts on the flocs of the fine powder to efficiently disperse them.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dispersing device for dispersing agglomerates of fine powder into a single powder.

[0002]

2. Description of the Related Art For example, a dry-type in-furnace desulfurization method is known in which a desulfurizing agent made of limestone or the like is placed in a furnace for desulfurization. By the way, in such a desulfurization method, in order to improve the desulfurization efficiency, it is necessary to increase the surface area of the desulfurization agent charged into the furnace to increase the reaction rate. It has been found that it is effective to set it on the order of several μm). However, the fine powder of the order of several μm has a very high cohesive property, and does not normally exist as a single body but exists as an agglomerate. Since such an agglomerate has a small apparent surface area, There was a problem that the reaction rate decreased.

Therefore, conventionally, as shown in FIG. 11, a nozzle (36) facing the inside of the furnace is formed in the furnace wall (35), and agglomerates of fine powder are introduced into the furnace by using high pressure air. The method of spraying is applied.

[0004]

However, the conventional method has the following problems. That is, the nozzle (3
The velocity distribution of the high-pressure air blown into the furnace from 6) is as shown in Fig. 11, and the agglomerates are dispersed by the gradient of this velocity distribution. Therefore, the nozzle (3
Although the effect of dispersing the agglomerates is excellent in the portion near the periphery of the injection port (37) of 6), there is a problem that the agglomerates are not dispersed near the center. In particular, when the amount of the desulfurizing agent in the high-pressure air is large, as in the actual machine, the amount of the desulfurizing agent that is not dispersed and injected as an aggregate increases, and there is a problem that the reaction rate decreases and the desulfurizing efficiency also decreases. .

An object of the present invention is to provide a dispersion device that solves the above problems.

[0006]

DISCLOSURE OF THE INVENTION A dispersion device according to the present invention comprises a high-speed gas duct having an opening formed in an upper portion thereof, and a duct provided above the high-speed gas duct in an airtight manner with respect to the duct and through the opening. It has a casing communicating with the inside and having a fine powder supply port, and a rotating disc arranged in a portion below the fine powder supply port in the casing. A large number of fine powder passages are formed vertically through the rotating disc at intervals, and a part of the peripheral edge of the rotating disc faces the inside of the high-speed gas duct through the opening from above. .

[0007]

The fine powder agglomerate fed into the casing from the fine powder supply port enters the high-speed gas passage through the fine powder passage of the rotating disk. At this time, the rotation direction of the rotating disk is
When the moving direction of the fine powder passage in the portion where the rotating disk faces the high-speed gas passage is set to be opposite to the flow direction of the high-speed gas, the speed of the fine powder aggregate passing through the fine powder passage and , The relative velocity with the velocity of the high-speed gas becomes very large, which causes the aggregates to be dispersed. Moreover, when a part of the agglomerates existing in the fine powder passage faces the high-speed gas passage, a large shearing force acts on the agglomerates, which also disperses the agglomerates.

Further, when the rotating direction of the rotating disk is set so that the moving direction of the fine powder passage in the portion where the rotating disk faces the high-speed gas flow path is the same as the flow direction of the high-speed gas, high speed is achieved. When the velocity of the gas is high and the velocity of the fine powder aggregate passing through the fine powder passage is low, the aggregate is dispersed by the relative velocity of the two.

[0009]

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

1 to 3 show the entire structure of a dispersion apparatus according to the present invention, and FIGS. 4 and 5 show a part thereof.

1 to 3, the dispersing device comprises a straight tubular high-speed air duct (1) (high-speed gas duct) having an opening (1a) formed in the upper part thereof, and a high-speed air duct (1) above the high-speed air duct (1). A casing (2) which is provided in an airtight manner with respect to the duct (1) and communicates with the inside of the duct (1) through an opening (1a); and a rotating disc (3) arranged in the casing (2). Is equipped with.

The upper wall of the casing (2) has a fine powder supply port (2
a) is formed, and a fine powder transport pipe is installed at this supply port (2a).
(4) is connected. The tip of the fine powder transport pipe (4) is open to the atmosphere. A pump (5) and a feeder (6) containing fine powder are provided from the casing (2) side in the middle of the fine powder transport pipe (4). 6) Fine powder is sucked from inside,
This air is transported to the casing (2).

A large number of notches (7) are formed in the peripheral portion of the rotating disk (3) at intervals in the circumferential direction.
(7) is a fine powder passage that vertically penetrates the rotating disk (3). A part of the peripheral edge of the rotating disk (3) faces the high speed gas duct (1) from above through the opening (1a). Also, the top of the rotating disc (3) has a top disc.
It is located on the central axis of (3) and the bottom edge is notched.
The conical surface (3a) is located at the radially inner end of (7). The rotating shaft (8) of the rotating disc (3) extends vertically upwards to the outside of the casing (2), and the upper end of the rotating disk (3) is located at the motor (9).
Is connected to the drive shaft of. The rotating disk (3) is rotated by the motor (9).

In such a structure, the rotating disk (3)
Is rotated by the motor in the direction indicated by arrow A in FIG. 1, and at the same time, high-speed air is caused to flow in the high-speed air duct (1) in the direction indicated by arrow B in FIG. Therefore, in the part where the peripheral part of the rotating disk (3) faces the high-speed air duct (1), the moving direction of the notch (7) of the rotating disk (3) and the flow direction of high-speed air are Goes in the opposite direction. The agglomerates of the fine powder are fed into the casing (2) through the fine powder supply port (2a) by the pump (5) and the conical surface (3a) of the rotating disk (3).
It falls down and is guided toward the peripheral edge. It then falls through the notch (7) into the high speed air duct (1). At this time, as shown in FIGS. 3 and 4, the velocity V _R of the agglomerate of the fine powder and the velocity V _{j of the} high-speed air.
Has a relative velocity V of V _R + V _j , which is so large that fine powder agglomerates are dispersed. That is, a large shearing force acts on the aggregate due to the relative velocity V = V _R + V _j , whereby the aggregate is dispersed.

Further, the rotating disk (3) is driven by a motor as shown in FIG.
1 is rotated in the direction opposite to the direction indicated by arrow A (the direction indicated by arrow C in FIG. 5), and when high-speed air is flowed in the high-speed air duct (1) in the direction indicated by arrow B in FIG.
In the part where the peripheral part of the rotating disk (3) faces the high-speed air duct (1), the moving direction of the notch (7) of the rotating disk (3) and the flow direction of high-speed air are the same. Turn to face. The agglomerates of the fine powder are fed into the casing (2) through the fine powder supply port (2a) by the pump (5) and fall onto the conical surface (3a) of the rotating disc (3), and the peripheral edge thereof. You will be guided to the club. It then falls through the notch (7) into the high speed air duct (1). At this time, as shown in FIG. 5, when the velocity V _R of the agglomerate of the fine powder is relatively small and the velocity V _j of the high-speed air is sufficiently high, these relative velocity V
= V _j −V _R exerts a sufficient dispersing ability to disperse the agglomerates of fine powder.

In the above, when the velocity V _R = 0 of the agglomerate of the fine powder, that is, when the disk (3) is not rotating, the size of the notch (7) is about 10 mm and the size is matched. However, rotation of the disk (3) is necessary because it causes clogging.

In the above embodiment, as shown in FIGS. 1 and 2, the fine powder supply port (2a) is formed on the peripheral wall of the casing (2) and the fine powder transport pipe (4) is connected to the tangent line of the casing (2). It may be provided in a direction parallel to the direction to generate a swirling flow in the casing (2).

Further, in the above embodiment, when the particle size of a single fine powder is large (about 10 μm), the high speed air duct is branched into a plurality of parts on the downstream side of the dispersion mechanism part with the rotating disk (3). May be. Since the fine powder as described above has a small re-agglomeration force, re-aggregation of a single dispersed fine powder does not occur much even if the fine powder is branched into a plurality of pipes and the pipe length is increased.

FIG. 6 shows a modification of the drive source for the rotating disk (3). In FIG. 6, the turbine disk (11) is fixedly provided on the upper end of the rotary shaft (8) of the rotary disk (3), and the turbine blade (12) is fixedly provided on the turbine disk (11). There is. Then, the high pressure air is applied to the turbine blades (12) to rotate the turbine disk (11) and the rotating shaft (8), thereby rotating the rotating disk (3). In this case, it is possible to prepare a plurality of dispersing devices and rotate the turbine disks (11) of all the dispersing devices by the high pressure air generated by one compressor.

7 and 8 show a modification of the rotating disk (3). In FIGS. 7 and 8, the upper surface of the rotating disk (3) is a flat surface, and a plurality of blades extending in the radial direction are formed on the upper surface.
(15) are provided radially at equal intervals in the circumferential direction. The fine powder dropped from the supply port (2a) onto the disc (3) is bladed by the centrifugal force generated by the rotation of the rotating disc (3).
It is designed to move radially outward along (15).
This prevents fine powder from accumulating in the casing (2).

FIG. 9 shows another modification of the rotating disk (3) of the present invention. In FIG. 9, the notch (20) formed in the peripheral portion of the rotating disc (3) is inclined forward in the rotation direction downward as viewed from the side. As a result, the speed V _X of the rotating disk (3) of the jet of fine powder in the direction of rotation is
It is added to the rotation speed of the rotating disk (3), that is, the speed V _R of the agglomerate of fine powder. As a result, the relative velocity V contributes to the dispersion of the aggregate of the fine powder becomes V _X + V _R + V _j, is improved dispersing effect of the aggregate of the fine powder.

FIG. 10 shows another embodiment of the present invention. In FIG. 10, the high speed air duct (30) is provided with an arcuate portion (31) having the same radius of curvature as the radius of the rotating disk (3). An opening is formed in the upper part of the high-speed air duct (30) over the entire arc-shaped part (31) so that the peripheral edge of the rotating disk (3) faces the high-speed air duct (30) from above through this opening. It has become. As a result, the contact area between the fine powder supplied on the disk (3) and the high-speed air becomes large, and even if the supply amount of the fine powder is increased, the dispersion effect of the agglomerates does not change so much and the treatment amount is increased. Can be increased.

[0023]

As described above, according to the dispersing device of the present invention, the agglomerates of fine powder can be efficiently dispersed.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is an enlarged sectional view taken along line III-III in FIG.

FIG. 4 is a partially enlarged view of FIG.

5 is a view corresponding to FIG. 4 in the case where the moving direction of the notch of the rotating disk and the flow direction of high-speed air are the same.

FIG. 6 is a cross-sectional view corresponding to FIG. 2 showing a modified example of the drive source for the rotating disk.

FIG. 7 is a horizontal sectional view showing a modified example of the rotating disk.

8 is a sectional view taken along line VIII-VIII of FIG.

FIG. 9 is a partially enlarged vertical sectional view showing another modified example of the rotating disk.

FIG. 10 is a partially cutaway plan view showing another embodiment of the present invention.

FIG. 11 is a partially enlarged sectional view showing a conventional example.

[Explanation of symbols]

 1 High-speed air duct (high-speed gas duct) 1a Opening 2 Casing 2a Fine powder supply port 3 Rotating disk 7 Notch (fine powder passage) 20 Notch (fine powder passage)

Claims (1)

[Claims] 1. A high-speed gas duct having an opening formed in an upper part thereof, and a high-speed gas duct provided above the high-speed gas duct in an airtight manner and communicating with the inside of the duct through the opening,
Further, it is provided with a casing having a fine powder supply port and a rotating disc disposed in a portion of the casing below the fine powder supply port, and is rotated at a circumferential interval on the peripheral edge of the rotating disc. A dispersion device in which a large number of fine powder passages are formed vertically through a disc so that a part of the peripheral edge of the rotating disc faces the high-speed gas duct from above through an opening.