JP2008119600A - Method for mixing powder and powder mixer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for mixing powders and a powder mixer suppressing powdery activated carbon from floating on water and enabling suitably mixing the powdery activated carbon in water. <P>SOLUTION: A first water stream (W1) is made to fall along the upper part of the inner wall (1a) of a mixing container (1) while circulating, the powdery activated carbon (P) is made to fall over the circulating first water stream (W1), a second water stream (W2) is made to join so as to cover the first water stream (W1) transferring the powdery activated carbon (P) while circulating along the upper inner wall (1a) and the joined water stream is made to fall and mix while circulating along the lower inner wall (1b) of the mixing container (1). The powdery activated carbon is held between the first and the second water streams to prevent the powdery activated carbon from floating on water. Since the first water stream, the activated carbon and the second water stream are mixed by circulating, the powdery activated carbon is suitably mixed with water. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a powder mixing method and a powder mixer, and more particularly to a powder mixing method and a powder mixer capable of suppressing powder from floating on water and suitably mixing the powder with water.

Conventionally, a mixer is known that mixes powdered activated carbon and water by spraying water downward from the top toward the falling powdered activated carbon while dropping the powdered activated carbon on flowing water (for example, Patent Documents). 1).
JP-A-9-155334 (FIG. 4)

In the conventional mixer, since the powdered activated carbon floats on the water simply by dropping the powdered activated carbon on the water, the powdered activated carbon is pressed down with the spray water by spraying water toward the powdered activated carbon.
However, since the powdered activated carbon falls continuously from above, the powdered activated carbon cannot be completely pressed down with the jet water, and there is a problem that some powdered activated carbon floats on the water.
Therefore, an object of the present invention is to provide a powder mixing method and a powder mixer capable of suppressing powder from floating on water and suitably mixing the powder with water.

In the first aspect, the present invention provides a first step of dropping the first water stream while swirling along the upper inner wall of the mixing container, and dropping the powder from above with respect to the swirling first water stream. A second step, a third step for joining the first water flow for conveying the powder while swirling along the upper inner wall so as to cover the second water flow from above, and the combined water flow And a fourth step of dropping while swirling along the lower inner wall of the mixing container.
In the powder mixing method according to the first aspect, after a powder (powdered activated carbon, slaked lime, etc.) is dropped on the first water stream, the second water stream is put on the powder, and the first water stream and the second water stream are covered. Since the powder is sandwiched between them, it can be suppressed that the powder floats on the water. Since the first water stream, the powder, and the second water stream are mixed by swirling, the powder can be suitably mixed with water.

In a second aspect, the present invention injects a first water flow toward the upper inner wall so as to fall while swirling along the upper inner wall of the mixing container, and a mixing container having a circular inner wall with a horizontal section. For a first water supply nozzle, a powder injection tube for dropping powder from above with respect to the swirling first water flow, and for the first water flow for conveying the powder while swirling along the upper inner wall Provided is a powder mixer comprising a second water supply nozzle for joining so as to cover a second water flow from above, and a lower inner wall of the mixing container in which the joined water flow falls while swirling. .
In the powder mixer according to the second aspect, the powder mixing method according to the first aspect can be suitably implemented.

In a third aspect, the present invention provides the powder mixer according to the second aspect, wherein the upper inner wall is cylindrical, and the lower inner wall is cylindrical with an inner diameter smaller than that of the upper inner wall. The powder mixer is characterized in that the part has a funnel shape.
In the powder mixer according to the third aspect, a swirl flow of the first water flow, the powder, and the second water flow is created in the upper part of the mixing container, and the swirl flow is directed toward the lower part of the mixing container to reduce the radius. The speed can be increased and the whole can be suitably mixed. Moreover, it is easy to manufacture structurally.

In a fourth aspect, the present invention provides the powder mixer according to the second aspect, wherein the powder mixer has a funnel shape in which the inner diameter gradually decreases from the upper inner wall to the lower inner wall. .
In the powder mixer according to the fourth aspect, a swirl flow of the first water flow, the powder, and the second water flow is formed at the upper part of the mixing container, and the swirl flow is directed toward the lower part of the mixing container to reduce the radius. The speed can be increased and the whole can be suitably mixed. In addition, it is difficult for powder to adhere to and accumulate on the inner wall.

In a fifth aspect, the present invention provides the powder mixer according to the second aspect, wherein the upper inner wall has a funnel shape in which an inner diameter gradually decreases downward, and the lower inner wall has a cylindrical shape. A powder mixer is provided.
In the powder mixer according to the fifth aspect, a swirl flow of the first water flow, the powder, and the second water flow is created at the upper part of the mixing container, and the swirl flow is directed toward the lower part of the mixing container to reduce the radius. The speed can be increased and the whole can be suitably mixed. Moreover, it is easy to manufacture structurally.

  According to the powder mixer of the present invention, the powder can be prevented from floating on the water, and the powder can be suitably mixed with water.

  Hereinafter, the present invention will be described in more detail with reference to embodiments shown in the drawings. Note that the present invention is not limited thereby.

FIG. 1 is a longitudinal sectional view of a powdered activated carbon mixer 100 according to the first embodiment. FIG. 2 is a top view of the same.
This powder activated carbon mixer 100 includes a mixing container 1 in which an upper inner wall 1a has a cylindrical shape, a lower inner wall 1b has a cylindrical shape whose inner diameter is smaller than that of the upper inner wall 1a, and an intermediate portion 1c thereof has a funnel shape. The first water supply nozzle 2 that injects the first water flow (W1 in FIG. 3) toward the upper inner wall 1a so as to fall while swirling along the upper inner wall 1a of the mixing container 1, and the first swirling first A powdered activated carbon injection pipe 3 for dropping powdered activated carbon (P in FIG. 3) from above with respect to the water flow (W1 in FIG. 3), and a first water stream (PW) that conveys the powdered activated carbon P while turning along the upper inner wall 1a ( 3 is provided with a second water supply nozzle 4 that joins a second water flow (W2 in FIG. 3) from above with respect to W1) in FIG.

As shown in FIGS. 3 and 4, when the first water flow W1 is injected from the first water supply nozzle 2 toward the upper inner wall 1a, the first water flow W1 falls while turning along the upper inner wall 1a. When the powdered activated carbon P is dropped from the powdered activated carbon injection pipe 3 onto the first water flow W1 falling while turning, the first water flow W1 falls while turning along the upper inner wall 1a with the powdered activated carbon P placed thereon. .
As shown in FIG. 5, when the second water flow W2 is sprayed from the second water supply nozzle 4 toward the upper inner wall 1a, the powdered activated carbon P on the first water flow W1 falling while swirling with the powdered activated carbon P is placed. A second water flow W2 is covered on (arranged so as to be), and the powdered activated carbon P is sandwiched between the first water flow W1 and the second water flow W2.
The first activated water stream W1, the powdered activated carbon P, and the second activated water stream W2 are swirled at a high speed peripheral speed along the intermediate portion 1c and the lower inner wall 1b, so that the powdered activated carbon P can be suitably mixed with water. I can do it.

  The powdered activated carbon mixer 100 is installed above the landing well in the water purification facility, and the mixed flow of the powdered activated carbon P and water is discharged to the injection point of the landing well.

  According to the powdered activated carbon mixer 100 of Example 1, it can suppress that the powdered activated carbon P floats on water, and can mix the powdered activated carbon P with water suitably. Moreover, it is the mixing container 1 of the structure which is easy to manufacture.

FIG. 6 is a longitudinal sectional view of the powdered activated carbon mixer 200 according to the second embodiment. FIG. 7 is a top view of the same.
The powdered activated carbon mixer 200 uses a funnel-shaped mixing container 1 whose inner diameter gradually decreases from the upper inner wall 1a to the lower inner wall 1b. Other configurations are the same as those of the first embodiment.

  According to the powdered activated carbon mixer 200 of Example 2, it can suppress that the powdered activated carbon P floats on water, and can mix the powdered activated carbon P with water suitably. Moreover, it is the mixing container 1 of the structure where powdered activated carbon P does not adhere and deposit easily.

FIG. 8 is a longitudinal sectional view of the powdered activated carbon mixer 300 according to the third embodiment. FIG. 9 is a top view of the same.
In the powdered activated carbon mixer 300, the upper inner wall 1a has a funnel shape in which the inner diameter gradually decreases downward, and the lower inner wall 1b has a cylindrical mixing container 1. Other configurations are the same as those of the first embodiment.

  According to the powdered activated carbon mixer 300 of Example 3, it can suppress that the powdered activated carbon P floats on water, and can mix the powdered activated carbon P with water suitably. Moreover, it is easy to manufacture structurally.

You may provide the 3rd water supply nozzle which covers a swirl flow which covered the 2nd water flow further, and covers a 3rd water flow.
Similarly, you may provide the 4th water supply nozzle etc. which cover a water flow further.

  The powder mixer of the present invention can be used, for example, to mix powdered activated carbon or slaked lime with water in a water purification facility.

1 is a longitudinal sectional view showing a powdered activated carbon mixer according to Example 1. FIG. 1 is a top view showing a powdered activated carbon mixer according to Example 1. FIG. It is explanatory drawing which shows the 1st water flow which concerns on Example 1, a powdered activated carbon, and a 2nd water flow. It is explanatory drawing which shows the 1st water flow and powdered activated carbon which concern on Example 1. FIG. It is explanatory drawing which shows the 1st water flow which concerns on Example 1, a powdered activated carbon, and a 2nd water flow. 3 is a longitudinal sectional view showing a powdered activated carbon mixer according to Example 2. FIG. 6 is a top view showing a powdered activated carbon mixer according to Example 2. FIG. It is a longitudinal cross-sectional view which shows the powdered activated carbon mixer which concerns on Example 3. FIG. 6 is a top view showing a powdered activated carbon mixer according to Example 3. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mixing container 1a Upper inner wall 1b Lower inner wall 1c Middle part 2 1st water supply nozzle 3 Powdered activated carbon injection pipe 4 2nd water supply nozzle 100,200 Powdered activated carbon mixer P Powdered activated carbon W1 1st water flow W2 2nd water flow

Claims (5)

A first step of dropping the first water stream while swirling along the upper inner wall of the mixing container; a second step of dropping powder from above with respect to the swirling first water stream; A third step of joining the first water stream carrying the powder while swirling along the second water stream from above, and the joined water stream along the lower inner wall of the mixing vessel A powder mixing method comprising: a fourth step of dropping while swirling. A mixing container having a circular inner wall with a horizontal cross section; a first water supply nozzle that injects a first water stream toward the upper inner wall so as to fall while swirling along the upper inner wall of the mixing container; A powder injection tube for dropping powder from above with respect to the first water flow, and a second water flow from above to cover the first water flow for conveying the powder while turning along the upper inner wall. A powder mixer, comprising: a second water supply nozzle to be joined; and a lower inner wall of the mixing container in which the joined water flow falls while swirling. The powder mixer according to claim 2, wherein the upper inner wall is cylindrical, the lower inner wall is cylindrical with an inner diameter smaller than the upper inner wall, and an intermediate portion thereof is funnel-shaped. Characteristic powder mixer. The powder mixer according to claim 2, wherein the powder mixer has a funnel shape in which an inner diameter gradually decreases from the upper inner wall to the lower inner wall. 3. The powder mixer according to claim 2, wherein the upper inner wall has a funnel shape in which an inner diameter gradually decreases downward and the lower inner wall has a cylindrical shape. 4.

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