JP2811637B2 - Slaked lime aqueous solution production equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing slaked lime aqueous solution used for improving tap water.

[0002]

2. Description of the Related Art Conventionally, caustic soda injection, soda ash injection, slaked lime injection, and the like have been known as measures for preventing red water from tap water. Recently, however, slaked lime injection has attracted attention. It is said that slaked lime not only raises the pH of water but also that the main component calcium is good for health, and furthermore, a technology has been developed to inject slaked lime as an aqueous solution instead of as a powder that is easy to fly. It has been widely adopted in water treatment plants.

[0003] As an apparatus for continuously producing slaked lime aqueous solution, for example, an apparatus described in Japanese Patent Application Laid-Open No. 05-68982 is known. In this known apparatus, the inside of a cylindrical or rectangular melting tank is divided into a main chamber and a sub-chamber communicating with each other at the bottom by a partition plate extending in a vertical direction, and a water supply pipe and an insoluble matter discharge port are provided at the bottom. A horizontally rotating stirring blade is provided just above the pipe, and a slaked lime aqueous solution discharge pipe is provided above the main chamber. Slaked lime is dropped and supplied to the sub chamber from above. The apparatus further includes a fluidized bed height suppression device including a plurality of parallel inclined plates at a position immediately above the stirring blade in the main chamber.

[0004] Since the above-mentioned known apparatus is provided with a fluidized bed height suppressing device, undissolved slaked lime powder flows out even when water is supplied at a high flow rate of, for example, 0.25 to 1.2 mm / s. Disappears. Therefore, the production speed of the slaked lime aqueous solution can be increased, and the size of the apparatus can be reduced.

[0005]

The above-mentioned known apparatus can be applied to a dissolving tank having a cylindrical or rectangular tube. In the case of a square tube, particularly a square tube, a plurality of dissolving tanks can be arranged adjacent to a limited space, which is advantageous, but has a problem in strength. On the other hand, a cylindrical one is advantageous in strength and easy to manufacture. However, it has the above-mentioned fluidized bed height suppressing device inside, and its manufacture is complicated. That is, since a plurality of parallel inclined plates are arranged so that the side edges are close to the inner wall of the cylindrical melting tank, the side edges are elliptical, and the size of each parallel plate is different, so that Has the problem of becoming extremely troublesome.

An object of the present invention is to solve such a problem and to provide an apparatus for producing a slaked lime aqueous solution having a fluidized bed height suppressing apparatus which can be easily manufactured.

[0007]

According to the present invention, a water supply pipe is connected to a lower part of a dissolving tank having a cylindrical portion, and a slaked lime aqueous solution extracting pipe is connected to an upper part thereof. In the apparatus for producing slaked lime aqueous solution having wings, a fluidized bed height suppression device having a rectangular outer shape that is substantially inscribed on the inner wall of the cylindrical portion above the stirring blade is provided, and the fluidized bed height suppression device is disposed on a horizontal plane. This is achieved by having a plurality of inclined and substantially parallel guideways.

[0008]

In the present invention having such a configuration, since the fluidized bed height suppressing device has a rectangular outer shape inscribed in the inner wall of the cylindrical portion of the dissolving tank, each inclined plate forming the guide path is provided on the side. The edges are straight and have the same width, and the length is the same except for the inclined plates near the both ends in the longitudinal direction, and a single type of member having the same shape and dimensions can be used. Even with the inclined plate or the like near both ends in the longitudinal direction, it is only necessary to cut the length to a predetermined size, so that the single type of member can be shortened and used.

According to the apparatus of the present invention, a plurality of broken circles (crescent parts) are formed between the inner wall of the cylindrical portion of the melting tank and the outer periphery of the fluidized bed height suppressing device. ,
It is desirable that at least one of the plurality of missing circles be a slaked lime charging chamber. However, in the present invention, slaked lime may be charged from any place. Further, if an auxiliary fluidized bed height suppressing device having a square outer shape is provided in the other missing circle, the effect is further improved.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view of an apparatus according to an embodiment of the present invention, and FIG. 2 is a plan view of the apparatus.

In FIG. 1, reference numeral 1 denotes a cylindrical melting tank having a cylindrical portion 1A forming an upper portion and a conical cylindrical portion 1B forming a lower portion and having a bottom plate 1C. The cylindrical portion 1A
Is provided with a lid member 1D.

In the range of the cylindrical portion 1A in the height direction of the dissolving tank 1, a fluidized bed height suppressing device 2 having a square external shape (in the illustrated case, a square shape) substantially inscribing the inner wall of the cylindrical portion 1A.
Are arranged. The fluidized bed height suppressing device 2 includes a rectangular frame 2A forming an outer periphery, and a plurality of inclined plates 2B held in parallel by the frame 2A. The frame 2A is fixed to the melting tank 1 by an appropriate means in the vicinity of the inscribed portion. Although the frame 2A is a rectangular tube formed of a flat plate in the illustrated case, the present invention is not limited to this. The frame 2A may be formed by simply connecting a rod-shaped member as long as it can support the inclined plate 2B. In the case of the present embodiment, one side wall of the frame body 2A forming the square tube is extended upward to the lid member 1D, and the four cut-outs formed around the fluidized bed height suppressing device 2 shown in FIG. One of the circular portions (crescent-shaped spaces) 4A to 4D is defined as a space isolated from the surroundings in the fluidized bed height suppressing device 2 and a height range above the fluidized bed height suppressing device 2 and a slaked lime charging chamber described later. Is formed. When the frame 2A is formed of a rod-shaped member, only the one side wall is formed of a flat plate member.

In the case of the present embodiment, the fluidized bed height suppressing device 2 has a plurality of inclined guide paths penetrating vertically by a plurality of parallel inclined plates 2B. The width of the guideway is 5
50 mm is desirable, and the inclination angle with respect to the horizontal plane is often in the range of 45 to 75 °. In the present embodiment, as is apparent from FIG. 2, each of the inclined plates 2B has the same width and straight side edges, so that it can be easily manufactured from plate members of the same dimensions. In addition, except for several inclined plates (shown by two-dot chain lines) located in the vicinity of both side ends in FIG. 1, all the intermediate parts may have the same length (up and down dimensions). In some cases, the inclined plates located near the both side ends are omitted. However, even in the case where the inclined plates are provided, the length may be shorter than that of the intermediate portion, and the same width can be used. There is nothing difficult to make.

The guide path of the fluidized bed height suppression device 2 is not limited to a flat inclined plate as in this embodiment, but also a flat plate having edges at both ends in the width direction or a corrugated plate having grooves extending vertically. Or may be formed by bundling tube members.

A drive shaft 5 vertically penetrating the inclined plate 2B is rotatably supported at the center of the plan view of the fluidized bed height suppressing device 2 and a stirring blade 6 is provided at the lower end of the drive shaft 5. Is attached. The conical cylindrical portion 1B of the melting tank 1
A water supply pipe 7 for supplying water from the outside into the dissolving tank 1 and a discharge pipe 8 for discharging insoluble matter to the outside at an appropriate time are connected to the bottom via valves. Also,
An extraction pipe 9 for extracting a slaked lime aqueous solution as a product is connected to an upper portion of the cylindrical portion 1A of the melting tank 1.

A slaked lime charging hopper 10 is provided on the lid member 1D via a valve (not shown) in the slaked lime charging chamber formed in the above-mentioned missing portion 4A, and the slaked lime charged on the water surface is provided. A spray device 11 for preventing scattering is also provided.

In the apparatus of this embodiment having such a configuration, the slaked lime aqueous solution is manufactured in the following manner.

A predetermined amount of slaked lime is dropped from the hopper 10 onto the water surface in the slaked lime charging chamber formed in the missing circle 4A.
At this time, the scattered slaked lime particles are prevented from escaping to the outside air by the spray 11. The dropped slaked lime comes into contact with water to form a slurry and settle.

The sedimented slurry is deposited at the bottom of the conical cylindrical portion 1B of the dissolving tank 1, where it is stirred by the stirring blades 6 to form a fluidized bed, and further supplied with water from the water supply pipe 7. Upon contact with water, dissolution proceeds to form slaked lime aqueous solution.

The slaked lime aqueous solution rises. that time,
The rising slaked lime aqueous solution contains some undissolved slaked lime particles in the fluidized bed, which rises together.

The aqueous slaked lime solution containing the undissolved slaked lime particles rises in the guide path formed by the inclined plates 2B, 2B... Of the fluidized bed height suppressing device 2. Slaked lime particles are separated inside the guideway, and only the slaked lime aqueous solution continues to rise.

Thus, only the aqueous slaked lime aqueous solution containing almost no undissolved slaked lime particles near the water surface of the main chamber 4 above the fluidized bed height suppressing device 2 is taken out from the discharge pipe 9 as a product.

The present invention is not limited to the above, and various modifications are possible. For example, to effectively use the cross-sectional area of the cylindrical portion 1A for a fluidized bed height suppression device,
The sub-circles 4A, 4B, 4C, and 4D have an inclined plate also in the other three circular-circles 4B, 4C, and 4D except for the circular-circle 4A used for the slaked lime charging chamber. It is preferable to dispose 14B, 14C, and 14D as a fluidized bed height suppressing device. By doing so, the rise of undissolved lime particles can be more effectively suppressed.

Also, the dissolving tank does not need to have a conical cylindrical portion below the cylindrical portion as shown in the figure, and the entire dissolving tank may be formed as a cylindrical portion.

[0025]

As described above, according to the present invention, the cylindrical portion is provided in the dissolving tank, and the fluidized bed height suppressing device has a rectangular outer shape inscribed in the cylindrical portion. An advantage is obtained in that the fluidized bed height suppressing device can be easily manufactured while securing the advantage of strength.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a schematic configuration of an apparatus according to an embodiment of the present invention.

FIG. 2 is a partially cutaway plan view of the apparatus of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dissolution tank 1A Cylindrical part 2 Fluidized bed height suppression device 2B Inclined plate 4A, 4B, 4C, 4D Partial broken part 6 Stirrer blade

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI C01F 11/02 C01F 11/02 Z C02F 1/66 510 C02F 1/66 510C 521 521D 530 530Z C04B 2/08 C04B 2/08 ( 72) Inventor Ryoichi Watanabe 5-8-22 Nakaoka-cho, Iwaki-shi, Fukushima (56) References JP-A-6-63566 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) C02F 1/68 B01F 1/00 B01F 7/16 C01F 11/02 C02F 1/66 C04B 2/08

Claims (4)

(57) [Claims] 1. A slaked lime aqueous solution manufacturing apparatus, comprising: a water supply pipe connected to a lower part of a dissolving tank having a cylindrical portion; A fluidized bed height suppression device having a rectangular outer shape substantially inscribing the inner wall of the cylindrical portion is provided above the fluidized bed height suppression device. An apparatus for producing an aqueous slaked lime solution. 2. A space in which at least one cut-out portion formed between the inner wall of the cylindrical portion and the outer periphery of the fluidized bed height suppressing device having a rectangular outer shape is partitioned in the height direction in the range of the upper portion of the cylinder. The slaked lime aqueous solution manufacturing apparatus according to claim 1, wherein a slaked lime input chamber is provided in the space. 3. The apparatus for producing an aqueous slaked lime aqueous solution according to claim 2, wherein a fluidized bed height suppression device having a rectangular outer shape is provided also in a noncircular portion other than the noncircular portion used as the slaked lime charging chamber. . 4. A guide path of the fluidized bed height suppression device is formed by a plurality of inclined plates or inclined pipes substantially parallel to each other, and the guide path has a width of 5 to 50 mm and an inclination angle of 45 to a horizontal plane.
The apparatus for producing a slaked lime aqueous solution according to claim 1, wherein the temperature is −75 °.