JPS62176527A - Apparatus for dispersing fine powder - Google Patents

Abstract

PURPOSE:To increase the treatment amount of fine powder, by forming a fine powder flow passage, of which the terminal is formed into a ring shaped or line shaped slit type jet orifice, to a main body and forming a gas supply passage obliquely communicating with the downstream side of said flow passage. CONSTITUTION:An air stream 22 is generated from a hopper 6 through a ring shaped upper flow passage 7 and, when a fine powder 15 is supplied to the hopper 6 in this state, said fine powder 15 is absorbed and accompanied by the air stream 22 to flow from the ring shaped upper flow passage 7 to a ring shaped lower flow passage 8. The fine powder 15 receives the strong mixing and shearing stream of the air generated from the speed difference between the low speed air stream 22 and the high speed air streams 16, 17 injected and flowing in from both air supply passage 9, 10 and flocculated particles are dispersed to be formed into single particles. In this dispersing system, the treatment amount of the fine powder can be markedly enhanced, for example, to 1ton/hr per apparatus.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a molecular II device for fine powder employed in dispersing agglomerated fine powder.

Conventional technology In general, the finer the particles (10 μm or less in particle size), the greater the agglomeration, and as shown in FIG. 6, multiple single particles 25 stick together to form agglomerated particles 26, which behave as coarse particles. The trend becomes larger. Conventionally, as a dispersion device for the agglomerated particles 26, a system using an ordinary single-hole orifice or a mechanical pump has been adopted. but,
Such dispersion equipment can only process small amounts of fine powder, which has been a major obstacle to the development of large ceiling-mounted classifiers and large-capacity reaction equipment that handle fine powder.

Problems to be Solved by the Invention According to the conventional single-hole type described above, if the throughput was to be increased, the diameter would have to be increased, and sufficient dispersion could not be obtained unless an excessive amount of power was applied. That is, there is a limit to the throughput of the dispersion apparatus that disperses particles of several micrometers or less into single particles at the current stage (currently 30 to 50 Kyf/hrx per unit).

An object of the present invention is to provide a fine powder dispersion device that can significantly improve throughput without requiring excessive power.

Means for Solving the Problems In order to solve the above-mentioned problems, the fine powder dispersion device of the present invention has a main body formed with a fine powder flow path having a ring-shaped or line-shaped slit-shaped jet outlet at the end, A gas supply path is formed in the main body, which is inclined toward the downstream side with respect to the fine powder flow path and is in communication with the fine powder flow path.

According to the configuration of the present invention, the gas obliquely injected toward the downstream side with respect to the fine powder flow path causes an ejector action in the fine powder flow path, so that the fine powder can be suction-transported and dispersed. Furthermore, since the fine powder channel is of a slit type, it is possible to disperse a large amount at the same time.

Embodiment A first embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

The main body 1, which is approximately disk-shaped, consists of a lower part 2 and an upper part 4 that is externally fitted onto the lower part 2 via a sealing material 3. Both parts 2 and 3 are integrated by, for example, bolts. Ru. An annular hopper 6 centered on the main body axis 5 is formed in the upper part 4, and a ring-shaped upper channel 7 with an open bottom end is formed from the lower part of the hopper 6. A ring-shaped lower channel 8 is formed in the lower part 2 and is opposed to and communicates with the ring-shaped upper channel 7 . Both flow passages 7 and 8 are not completely ring-shaped, but have connecting portions scattered in the circumferential direction so as to integrate the outer and inner parts of both parts 2 and 4. A portion of the upper part 4 in which the hopper 6 is formed protrudes downward, and an annular hopper-shaped recessed part is formed on the upper surface side of the lower part 2 so that the protrusion fits therein.

This fitting is performed in such a way that a tapered gap is created, so that the annular inner gas supply passage 9 and the outer gas supply passage 9 are inclined toward the downstream side with respect to the fine powder flow passage 7.8, and communicate with each other. 10. An internal gas reservoir 11 is formed between opposing surfaces of both parts 2 and 4 so as to be located on the main body axis 5, and this internal gas reservoir 11 is connected to the inner end of the inner gas supply passage 9. At the same time, the first gas supply pipe 12 attached to the upper part 4 is communicated. An annular external gas reservoir 13 is formed in the upper part 4 outside the hopper 6, and this external gas reservoir 13 communicates with the outer end of the outer gas supply passage 10, and a second A gas supply pipe 14 is communicated. 15 indicates fine powder, and 16.17 indicates gas such as air.

The ring-shaped lower flow path 8 has a ring-shaped spout 18 at its end.
A plywood 2o having a ring-shaped flow path 19 facing and communicating with the spout 18 is fitted and disposed below the lower part 2 via a sealing material 21.

In the first embodiment, when dispersing the fine powder 15, firstly, from both supply pipes 12.14, for example, 2 to 3K
High pressure gases 16 and 17 of gf/clI or higher are supplied respectively. Then, the gas 16 in the internal gas reservoir 11 is injected downstream into the flow channels 7 and 8 through the inner gas supply channel 9, and the gas 17 in the external gas reservoir 13 is injected into the flow channels 7 and 8 through the inner gas supply channel 9. They are injected downstream through the channel 1o into the annular lower channel 8, producing an ejector effect in these injectors. At this time, the lower part of the ring-shaped upper flow path 7 becomes negative pressure, and an air flow 22 is generated from the hopper 6 through the ring-shaped upper flow path 7. When the fine powder 15 is supplied to the hopper 6 in this state, the fine powder 15 is entrained (suctioned) by the airflow 22 and flows from the ring-shaped upper channel 7 to the ring-shaped lower channel 8. Here, the fine powder 15 is composed of a low-velocity airflow 22 flowing in from the ring-shaped upper channel 7 and a high-velocity (supersonic) gas 16.17 injected (inflowing) from both gas supply channels 9.10. The intense mixed shear flow of gas resulting from the velocity difference causes the agglomerated particles to be dispersed into single particles.

According to this distributed format, the processing amount can be reduced to, for example, 1 tan/
This can be significantly improved to 1 unit over hr.

A lid plate may be disposed in the opening of the hopper 6, or the hopper 6 may be omitted and a fine powder supply pipe may be connected thereto.

FIG. 3 shows a second embodiment that is a modification of the first embodiment.

That is, in contrast to the first embodiment, the structure for supplying gas 17 from the outside is omitted, and the gas 16 is supplied only from the inside.

Whereas in the first and second embodiments described above, the injection port 18 and the like are formed in a ring shape, in the third embodiment shown in FIG. 4 and the fourth embodiment shown in FIG. is formed in a line shape.

Effects of the Invention According to the present invention having the above configuration, the gas injected at an angle toward the downstream side with respect to the fine powder flow path causes an ejector action in the fine powder flow path to suction and transport the fine powder, and the gas The agglomerated fine powder can be dispersed by the intense mixed shear flow generated from the speed difference. At this time, since the fine powder flow path and the ejection port are of a slit type, it is possible to simultaneously disperse a large number of particles. As described above, according to the present invention, without impairing the dispersion performance of the single hole type,
The throughput of fine powder per unit time can be dramatically improved.

[Brief explanation of drawings]

1 and 2 show a first embodiment of the present invention, FIG. 1 is a longitudinal sectional view, FIG. 2 is a bottom view with the plywood removed, and FIG. 3 is a second embodiment. FIG. 4 is a partially cutaway perspective view showing the third embodiment, FIG. 5 is a partially cutaway perspective view of the fourth embodiment, and FIG. 6 is an explanatory view. 1...Main body, 2...Lower parts, 4...Upper parts,
7... Ring-shaped upper channel, 8... Ring-shaped lower channel, 9... Inner gas supply channel, 10... Outer gas supply channel, 11... Internal gas reservoir, 13...・External gas reservoir, 15... Fine powder, 16, 17... Gas, 18.
...Spout, 22...Airflow agent Morimoto
YoshihiroFigure 3Figure 4Figure 5Figure 2

Claims (1)

[Claims] 1. A fine powder flow path having a ring-shaped or line-shaped slit-shaped jet outlet at the end is formed in the main body, and a gas that is inclined toward the downstream side with respect to the fine powder flow path and communicates with the main body is formed. A dispersion device for fine powder, characterized in that a supply path is formed.