JP2001025652A - Powder injection and dissolution apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably produce a desired solution and a slurry by easily preventing or suppressing adhesion of a supplied powder to the inner face of a dissolution tank. SOLUTION: In a powder injection and dissolution apparatus for producing a solution or a slurry by dissolving a powder supplied to a dissolution tank 5 having the ceiling wall 11 and the sidewall 12 in a liquid, at least a part of a supply means for a liquid to the dissolution tank 5 is composed to be a means 14 for supplying a liquid along the inner face of the ceiling wall 11 and/or the sidewall 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder injecting and dissolving apparatus, and more particularly to a powder injecting and dissolving apparatus capable of supplying a liquid to a dissolving tank for cleaning an inner surface.

[0002]

2. Description of the Related Art There is known a powder injection and dissolution apparatus for transporting powder to a dissolution tank and dissolving the powder in a liquid in the dissolution tank to prepare a solution or slurry. In this powder injection melting apparatus, for example, as shown in FIG. 7, powder is supplied to a melting tank 101 through a transport pipe 102, and a separate melting tank 101 is supplied.
It is dissolved in a liquid supplied into the inside, for example, water, and stirred to produce a solution or slurry.

In such a powder injection melting apparatus,
The soared powder may adhere to the inner surface of the ceiling wall 103 or the side wall 104 of the melting tank 101. In particular, when water droplets or moisture are present on the inner surface of the wall due to moisture in the dissolving tank 101, dew condensation, or the like, powder easily adheres.

In recent years, in the supply of powder, the advent of a single-screw screw pump and the like has made it easier to transport the powder little by little in a quantitative and accurate manner.
Thus, it is possible to accurately prepare a target solution or slurry having a predetermined concentration.

[0005]

However, as described above, when a part of the supplied powder adheres to the inner surfaces of the ceiling wall 103 and the side wall 104 of the dissolving tank 101, the dissolving solution prepared is correspondingly increased. And the accuracy of the slurry concentration may be reduced. Further, when the amount of powder attached becomes large, the attached powder may be irregularly peeled off and mixed into the solution or slurry being prepared, and the accuracy of the concentration may also be reduced.

[0006] If the powder adheres for a long period of time, the composition of the powder may change to cause inconvenience. For example, if the powder is slaked lime, if it adheres, it may react with carbon dioxide in the gas and change to calcium carbonate. If the adhered powder changed in this way is mixed, it becomes impossible to prepare a solution or slurry to a target composition.

Further, for example, when the powder is slaked lime as described above, since the powder attached to calcium carbonate is hard, it takes a great deal of time and labor to clean or scrape off the powder. In other words, maintenance is inferior.

Therefore, the adhesion of the supplied powder to the inner surface of the melting tank must be suppressed as much as possible.

Accordingly, an object of the present invention is to pay attention to the above-mentioned problems, to easily prevent or suppress the adhesion of the supplied powder to the inner surface of the dissolving tank, and to prepare a desired dissolving solution or slurry. An object of the present invention is to provide a powder injection and melting apparatus which can be stably performed.

[0010]

In order to solve the above-mentioned problems, a powder injection dissolution apparatus according to the present invention dissolves powder supplied into a dissolution tank having a ceiling wall and side walls by dissolving the powder in a liquid. In a powder injection dissolution apparatus for preparing a liquid or a slurry, at least a part of the supply means of the liquid into the dissolution tank is configured to be a means for supplying the liquid along the inner surface of the ceiling wall and / or the side wall. It is characterized by the following. The liquid supply means may be a means for supplying the entire amount of the liquid for preparing the solution or slurry in the dissolution tank, or a means for supplying a part of the liquid along the inner surface of the wall. Alternatively, the remaining part may be configured differently from a means for supplying the remaining amount from another pipe so that a predetermined amount can be supplied as a whole.

The liquid supply means may be composed of, for example, a liquid supply pipe having a plurality of holes for ejecting the liquid along the inner surface of either or both of the ceiling wall and the side wall.

The position of the liquid supply means is as follows.
For example, a corner between a ceiling wall and a side wall is preferable.
By arranging the liquid at this location, the liquid can be easily supplied along the inner surface of both or both of the ceiling wall and the side wall. It is preferable that the liquid supply means, for example, a liquid supply pipe arranged at the corner portion extends in the circumferential direction of the dissolving tank. That is, when the cross-sectional shape of the dissolution tank is circular, it preferably extends along the circumferential direction, and when the cross-sectional shape is square, it extends along each side direction, preferably over the entire circumference. .

Further, it is also possible to adopt a structure in which the inner surface of the ceiling wall is formed in a cone shape in which the central portion is located at a lower position and the peripheral portion is located at a higher position in the transverse sectional direction of the dissolving tank. If such a shape is adopted, the liquid supplied along the inner surface of the ceiling wall from the peripheral portion of the ceiling wall,
It can flow along the ceiling wall toward the cone-shaped tip (lowest part), and can be dropped from the tip into the tank. Therefore, the supplied liquid can be flowed substantially without dropping over the entire inner surface of the ceiling wall, and the entire surface of the ceiling wall can be reliably washed.

The supply port of the powder to the melting tank is provided on the ceiling wall or the side wall of the melting tank (usually the ceiling wall), but is supplied along the inner surface of the wall as described above. In order to prevent the liquid to be supplied from coming into contact with the supplied powder as much as possible at the powder supply port, and to prevent the powder from adhering due to wetness, for example, the powder supply port is provided with a double pipe. It is preferable to have a structure. For example, the supply port of the powder to the dissolving tank is an outer cylinder that is disposed around the inner pipe at an interval from the inner pipe, and that opens toward the dissolving tank. And a double pipe structure. Further, in this case, it is also possible to adopt a structure in which the distal ends of the inner tube and the outer cylinder protrude more toward the inside of the melting tank than the inner surface of the melting tank.

The means for transporting the powder to the melting tank is not particularly limited. However, if a transport system using a screw pump, for example, a single-shaft screw pump, is used, the powder can be transported quantitatively little by little as described above. In addition, the liquid supply method according to the present invention can simultaneously prevent the powder from adhering to the inner surface of the dissolving tank.

According to the powder injection dissolution apparatus of the present invention, at least a part of the liquid for preparing the solution or slurry is supplied along the inner surface of the ceiling wall or the side wall and used for cleaning the inner surface of the wall. After washing, the solution or slurry is used as it is. That is, instead of supplying a liquid specifically for cleaning, at least a part of the liquid used for preparing the solution or slurry is used for cleaning the inner surface of the wall, and the supplied liquid is not wasted. Does not occur at all.

The liquid supplied along the inner surface of the ceiling wall or the side wall flows along the inner surface along the inner surface to prevent the powder from adhering and to wash away the adhering powder. . Since the liquid supply is performed intermittently or substantially continuously at each operation of preparing the solution or slurry, adhesion of the powder to the inner surface of the wall is reliably prevented.

As a result of preventing the powder from adhering to the inner surface of the wall, the entire amount of the supplied powder is used for preparing the solution or slurry, and the concentration can be adjusted with high accuracy. Become. Further, since the composition of the attached powder does not change, the target solution or slurry is stably prepared. In addition, it is possible to eliminate the need for removal of deposits, and it is not necessary to generate hard deposits.Thus, maintenance of the melting tank becomes extremely easy and stable operation can be performed for a long period of time. become. Therefore, as in the case of slaked lime or the like, an optimal powder injection and melting apparatus is realized by using a system in which the composition has conventionally changed or hard deposits have been easily generated.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 and FIG.
1 shows a powder pouring and dissolving apparatus according to an embodiment of the present invention, particularly a powder pouring and dissolving apparatus suitable for a case where adhesion of powder such as slaked lime to a wall surface becomes a problem. In FIG. 1, a powder 1 is stored in a powder storage hopper 2, and is supplied into a melting tank 5 through a transport pipe 4 by a powder supply pump 3 installed below the hopper 2. As the powder supply pump 3, a single-shaft screw pump capable of supplying a fixed amount is used.

A liquid, in this embodiment, water, is supplied to the dissolving tank 5 through a liquid supply line 6. The supplied powder 1 and water are prepared into a predetermined solution or slurry while being stirred by the stirrer 7. The generated solution or slurry is sent to another process via the drawing pump 8. When preparing the solution or slurry in the dissolving tank 5, in order to prevent the powder from scattering from the exhaust port 9, the exhaust port 9
Is provided with a filter 10.

The dissolving tank 5 has a ceiling wall 11 and side walls 12, and in the present embodiment, is configured as a tank having a circular cross section. The transport pipe 4 for the powder 1 is connected to the ceiling wall 11 in the present embodiment, and the supply port 13 to the melting tank 5 is opened downward. Into the dissolution tank 5, the supplied liquid (water) is connected to the liquid supply line 6 and spouts the supplied liquid (water) along the inner surfaces of the ceiling wall 11 and the side wall 12.
A liquid supply means 14 for supplying is provided. In the present embodiment, the liquid supply means 14 is disposed at a corner between the ceiling wall 11 and the side wall 12 and extends in the circumferential direction of the dissolution tank 5. In the circumferential direction, it may extend over the entire circumference, or may extend partially. Further, it may extend continuously in the circumferential direction, or may extend intermittently.

More specifically, as shown in FIG. 2, the liquid supply means 14 comprises a liquid supply pipe having a plurality of holes 14a and 14b formed in a pipe extending annularly in the dissolution tank 5. , From the hole 14a toward the inner surface of the ceiling wall 11,
The liquid is ejected from the holes 14b toward the inner surface of the side wall 12, respectively. However, holes 14a, 1
4b may be only one of them, and a configuration in which the liquid is ejected toward only one of the inner surface of the ceiling wall 11 and the inner surface of the side wall 12 is also possible. The direction in which the liquid is ejected may be determined according to the portion where the adhesion of the powder becomes a problem.

In the powder injection and dissolution apparatus configured as described above, the supplied powder 1 and water are mixed in the dissolution tank 5.
The mixture is mixed while being stirred by the stirrer 7 to prepare a solution or slurry having a predetermined concentration. Since the powder 1 is quantitatively supplied by the single screw pump 3, the powder 1 is precisely prepared into a target solution of a predetermined concentration or a slurry.

The water is sent from the liquid supply line 6 to the liquid supply means 14 (liquid supply pipe) and flows through the liquid supply means 14 extending in an annular shape, and passes through the holes 14a and 14b to form the inner surface and the side wall of the ceiling wall 11. 12 is sprayed toward the inner surface. This ejection operation is performed intermittently or substantially continuously. The jetted water flows along the inner surface of the ceiling wall 11 and the inner surface of the side wall 12, and while cleaning the inner surface,
It falls or flows downward in the dissolving tank 5 and is used for preparation of a dissolving solution or slurry.

The supply water is supplied to the inner surface of the ceiling wall 11 and the side wall 12.
The powder does not substantially adhere to these surfaces because it flows along the inner surfaces of the surfaces. Also, even if a small amount of powder adheres, it is washed away with the supplied water, so that substantially,
It does not grow to deposits. Since the supply of water is performed at least for each preparation of the solution or the slurry, large growth and deposition of deposits cannot occur.

As a result, substantially all of the supplied powder 1 is used for preparing the solution or slurry, and substantially all of the supplied water is used for preparing the solution or slurry. Therefore, it is precisely adjusted to a target concentration. In addition, since there is no drop of the deposits and no deposits having a changed composition, a desired solution or slurry can be obtained reliably and stably. Further, since the powder is prevented from adhering and hard deposits are not generated as in the case of slaked lime, the maintainability is extremely excellent and the maintenance can be made substantially free.

At the supply port of the powder 1 to the dissolving tank 5, water flowing along the inner surface of the ceiling wall 11 and direct contact with the supplied powder are avoided. In order to more reliably prevent the liquid from being wetted and attached to the supply port and its surroundings, for example, as shown in FIG. 3, it is effective to use a supply port 21 having a double pipe structure. That is, the inner pipe 22 and the ceiling are formed by forming the powder transport pipe 4 as the inner pipe 22 and surrounding the inner pipe 22 with an outer cylinder 23 opening toward the inside of the melting tank 5 at intervals. Since the space between the inner surface of the wall 11 and the inner surface of the wall 11 is isolated, water flowing along the inner surface of the ceiling wall 11 prevents the powder of the inner tube 22 or the powder immediately before falling from the inner tube 22 from getting wet. You.

In order to effectively use the water flowing along the inner surface of the ceiling wall 11 for cleaning over the entire surface without dropping on the way, for example, as shown in FIG.
It is effective that the ceiling wall 32 of the dissolving tank 31 has a configuration in which the inner surface thereof is formed in a cone shape in which the central portion is positioned lower and the peripheral portion is positioned higher in the cross-sectional direction of the dissolving tank 31. It is.

With such a cone-shaped ceiling wall 32, the water jetted from the liquid supply means 14 along the inner surface of the ceiling wall 32 does not fall, but goes to the lowest part of the central part of the cone shape. And falls downward from the tank from there. Therefore, the annular liquid supply means 1
The water supplied from 4 will be used for preparing the solution or slurry after substantially completely cleaning the inner surface of the ceiling wall 32, and the adhesion of powder on this surface will be more reliably prevented. You.

Further, at the supply port of the powder 1 to the dissolving tank 5, a structure is provided to avoid direct contact between the water flowing along the inner surface of the ceiling wall 11 and the supply powder. It is also effective to use a structure in which the tip portion projects more inward of the dissolution tank 5 than the inner surface of the ceiling wall 11. Referring to the supply port of the above-described double pipe structure, for example, as shown in FIG. 5, the lower end of the inner tube 42 and the outer cylinder 43 of the supply port 41 having the double pipe structure is A structure protruding inward of the melting tank 5 from the inner surface of the ceiling wall 11 can be adopted.

With this configuration, the outlet of the powder can be separated from the inner surface of the ceiling wall 11, and the adhesion of the powder to the inner surface of the ceiling wall 11 due to the curling of the powder from the outlet can be minimized. In addition to being able to suppress, the washing water is more reliably prevented from flowing into the double pipe, particularly to the inner pipe 42, and the powder inside is prevented from getting wet.

Further, it is also possible to adopt a structure in which the inner surface of the ceiling wall has a cone shape in the opposite direction to that shown in FIG. For example, as shown in FIG. 6, the ceiling wall 52 of the melting tank 51 is formed in a cone shape in which the central portion is located at a higher position and the peripheral portion is located at a lower position. A supply port 53 of powder having, for example, a double-pipe structure of an inner pipe 54 and an outer pipe 55 is provided at or near the top of the cone, and around the outer pipe 55, on the inner surface of the ceiling wall 52. The liquid supply means 56 for ejecting liquid toward the liquid supply unit is disposed.

In such a configuration, the liquid supplied from the liquid supply means 56 toward the inner surface of the ceiling wall 52 is
After flowing along the inner surface of the ceiling wall 52 without falling, the inner surface of the side wall of the dissolving tank 51 is washed, and then flows down along the inner surface of the side wall. Also wash. Therefore, the liquid once supplied is efficiently used for cleaning both the inner surface of the ceiling wall 52 and the inner surface of the side wall, and is then provided for the preparation of the solution or slurry.

[0034]

As described above, according to the powder pouring and dissolving apparatus of the present invention, at least a part of the means for supplying the liquid into the dissolving tank is arranged along the inner surface of the ceiling wall and / or the side wall. Since it is configured as a means for supplying a liquid, and a solution for preparing a solution or a slurry is used for cleaning the inner surface of the tank, it is possible to prevent powder from adhering to the inner surface of the tank, and it is stable for a long time. A highly accurate solution or slurry can be prepared.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a powder injection melting apparatus according to an embodiment of the present invention.

FIG. 2 is an enlarged partial perspective view of a liquid supply unit of FIG.

FIG. 3 is a schematic vertical sectional view of a powder supply port of a powder injection and melting apparatus according to another embodiment of the present invention.

FIG. 4 is a schematic longitudinal sectional view of a melting tank of a powder injection melting apparatus according to still another embodiment of the present invention.

FIG. 5 is a schematic longitudinal sectional view of a melting tank of a powder injection melting apparatus according to still another embodiment of the present invention.

FIG. 6 is a schematic longitudinal sectional view of a melting tank of a powder injection melting apparatus according to still another embodiment of the present invention.

FIG. 7 is a schematic vertical sectional view of a conventional dissolving tank.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Powder 2 Powder storage hopper 3 Powder supply pump (uniaxial screw pump) 4 Transport pipe 5, 31, 51 Dissolution tank 6 Liquid supply line 7 Stirrer 8 Extraction pump 9 Exhaust port 10 Filter 11 Ceiling wall 12 Side wall 13, 21 , 41, 53 Powder supply port 14, 56 Liquid supply means (liquid supply pipe) 14a, 14b Hole 22, 42, 54 Inner tube 23, 43, 55 Outer tube 32, 52 Conical ceiling wall

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Masayuki Takahashi 1-2-2-8 Shinsuna, Koto-ku, Tokyo Organo Corporation F-term (reference) 4G035 AA19 AA20 AB46 4G037 AA03 AA09 EA04

Claims (9)

[Claims] 1. A powder injection dissolving apparatus for dissolving powder supplied into a dissolving tank having a ceiling wall and a side wall into a liquid to prepare a dissolving liquid or a slurry, wherein a means for supplying liquid to the dissolving tank is provided. At least part of the ceiling wall and / or
Alternatively, the powder injection and dissolution apparatus is configured to supply liquid along the inner surface of the side wall. 2. The powder injection and dissolution apparatus according to claim 1, wherein the liquid supply means comprises a liquid supply pipe having a plurality of holes for ejecting liquid along the inner surface of the ceiling wall and / or the side wall. 3. The powder injection and dissolution apparatus according to claim 1, wherein the liquid supply means is disposed at a corner between the ceiling wall and the side wall. 4. The powder injection and dissolution apparatus according to claim 3, wherein the liquid supply means extends in a circumferential direction of the dissolution tank at a corner between the ceiling wall and the side wall. 5. The inner surface of the ceiling wall is formed in a cone shape having a lower central portion and a higher peripheral portion in the cross-sectional direction of the melting tank.
A powder injection dissolution apparatus according to any one of the above. 6. A supply port for supplying a powder to a melting tank has a powder transport pipe as an inner pipe, is disposed around the inner pipe at an interval from the inner pipe, and opens toward the melting tank. The powder injection and dissolution apparatus according to any one of claims 1 to 5, wherein the apparatus is configured to have a double-pipe structure provided with an outer cylinder. 7. The powder injection and melting apparatus according to claim 6, wherein the powder supply port is provided on a ceiling wall of the melting tank. 8. The dissolving tank according to claim 6, wherein the distal ends of the inner tube and the outer cylinder protrude more toward the inside of the dissolving tank than the inner surface of the dissolving tank.
Powder dissolution equipment. 9. The powder according to claim 1, wherein the powder is slaked lime.
A powder injection dissolution apparatus according to any one of the above.