JPH03202138A - Granulating dripping nozzle and granulator using the same - Google Patents

Abstract

PURPOSE:To increase granulating speed by dripping liquid droplets at a rapid interval by providing a tube body and a fine wire to a nozzle and providing the dripping part formed so as to extend from the end part of the tube body to the wire. CONSTITUTION:The liquid (e.g; a liquid prepared by mixing a fine deodorant powder with a water-soluble alginate aqueous solution) in a tank 10 is dripped in the dispersing medium (e. g; alcohol) in the granulating tank 13 provided under the tank 10 from the nozzle 14 provided to the tank 10 to prepare a granule D becoming insoluble in the dispersing medium by the reaction of the component of the dispersing medium with the liquid. At this time, a tube body 15 and a fine wire 16 are provided to the nozzle 14 and the dripping part 16a formed so as to extend from the end part of the tube body 15 is provided to the wire 16. As a result, liquid droplets can be dripped at a rapid interval and the speedup of granulation can be achieved.

Description

[Detailed Description of the Invention] (Objective of the Invention) <Industrial Application Field> The present invention can be applied by dispersing water-soluble alginate dropwise into an aqueous solution of a metal salt such as calcium chloride or a dispersion medium such as an acid or alcohol. , relates to a dropping nozzle for granulation and a granulation device using the same to obtain a good dripping condition in a method of producing granules by utilizing the insolubility of the surface or inner surface of dispersed particles. .

<Background of the Invention> In recent years, aggregates of particles in which zinc oxide, titanium dioxide, and water molecules are tightly bound (see Japanese Patent Application Laid-Open No. 6154935) have been developed.
Its strong deodorizing performance has been evaluated and it has been used in various fields. This deodorizing fine powder agent, which is represented by an aggregate of particles in which zinc oxide, titanium dioxide, and water molecules are tightly bound, is a fine particle of micron or submicron order, so it is easily scattered in its original state. This made it extremely difficult to use in practice. Therefore, when using this material, a method has been adopted in which a binder such as polyvinyl alcohol is used and the material is supported on paper, fiber, foam, etc. However, when using this method, there are problems such as difficulty in granulation due to the viscosity or stickiness of the binder, and insufficient deodorizing effects due to the poor gas permeability of the polyvinyl alcohol film. there were.

Therefore, the present inventor attempted research to obtain a directly granulated product, and as a result, the deodorizing fine powder was mixed into a water-soluble alginate aqueous solution to form a mixed solution, and this mixed solution was mixed with polyvalent metal ions. A method for manufacturing deodorizing granules by drying an intermediate product obtained by dropping the product dropwise into a dispersion medium such as a metal salt aqueous solution or an acid or an alcohol, which is insolubilized at least on the surface, and a similar technology have been developed. . However, when dropping the liquid mixture into the dispersion medium, the time interval between drops is slow if the mixture is simply dropped from a circular nozzle, and there is still room for improvement for industrial mass production. Of course, in order to speed up the time interval between drops, pressurizing the inside of the tank is one method that can be considered, but in reality, with this method, the liquid flows down continuously and granules cannot be obtained. Furthermore, when producing granules with a relatively large diameter, it is necessary to prepare several nozzles for that purpose, and the nozzles must be replaced with ones whose dimensions are set to match, making production management troublesome. In this respect, even with this prior art, there are still problems to be developed.

Technical matters for which development was attempted> The present invention was made in view of this background, and
For granulation, the surface tension at the nozzle tip is reduced to speed up the interval between drops from the nozzle, increasing production efficiency, and by changing the shape of the dripping area at the nozzle tip, large diameter droplets can be produced. This is an attempt to develop a dropping nozzle and a granulation device using the same.

(Structure of the Invention) Means for Achieving the Object> That is, the dropping nozzle for granulation, which is the first invention according to the present application, is capable of dispersing liquid from a nozzle provided in a tank into a dispersion medium in a granulation tank provided below the tank. In the apparatus for producing granules that become insoluble in the dispersion medium by a reaction between components of the dispersion medium and the liquid by dropping a liquid therein, the nozzle has a tube body and a narrow edge, This rim is characterized by having a dripping portion extending from the end of the tube.

In addition to meeting the above-mentioned requirements, the dropping nozzle for granulation, which is the second invention according to the present application, is characterized in that the dropping portion of the edge body is formed obliquely with respect to the vertical direction.

Furthermore, in addition to the above-mentioned requirements, the third invention of the present application is a dropping nozzle for granulation, which is characterized in that the dripping part of the edge has a particle size adjusting part in which the edge is formed into a substantially annular shape. It is what it is.

Furthermore, in addition to the above-mentioned requirements, the fourth invention of the present application, a granulation device using a dropping nozzle for granulation, changes the distance between the dripping part of the edge and the liquid level of the dispersion medium in the granulation tank. It is characterized by being able to do things.

These inventions are intended to distantly achieve the above object.

<Operation of the Invention> In the present invention, since the nozzle has a thin rim body and this rim body has a dripping portion extending from the end of the tube body, the liquid flowing out from the nozzle is transmitted along the rim body. The liquid then reaches the dripping part, from which it is dripped at rapid intervals.

Also, if the drip portions of the edge are formed obliquely to the vertical direction, the intervals between drops will be faster than when the drip portions are oriented vertically.

Furthermore, by providing a particle size adjusting section in which the rim is formed into a substantially annular shape at the dripping portion of the rim, droplets with a large diameter can be dripped by changing the diameter of this particle size adjusting section. .

Furthermore, by making it possible to change the distance between the dripping part of the rim and the liquid surface of the dispersion medium in the granulation tank, the falling distance of the droplet can be changed, so that the falling distance can be adjusted according to the falling distance. Various granules can be produced by physical changes in droplets.

<Examples> The present invention will be specifically described below based on illustrated examples. Reference numeral 1 denotes a deodorizing granule production line in which the granulation device of the present invention is incorporated, and this production line 1 includes a melting tank 2 for mixing a deodorizing fine powder into an alginate aqueous solution.
, a granulating device 3 that drops the liquid in the dissolving tank 2 to granulate it, and a cleaning device W4 that cleans the granules granulated by this granulating device 3. Here, the manufacturing principle and manufacturing method of the deodorizing granules manufactured by this manufacturing line j will be briefly explained. First, the manufacturing principle of deodorizing granules is that a deodorizing fine powder is mixed into a water-soluble alginate aqueous solution, and this mixture is mixed with an aqueous solution of a metal salt that can become a polyvalent metal ion such as calcium chloride, or a dispersion medium such as an acid or alcohol. In this method, the particles are dispersed in the liquid, and the surface or inside of the dispersion stream becomes insolubilized to form granules. That is, metal salt water 'f4? that can become a polyvalent metal ion? (When l is used as a dispersion medium, the sodium ions of a water-soluble alginate, such as sodium alginate, are substituted with polyvalent metal ions, such as calcium ions, to form a layer of water-insoluble calcium alginate on at least the surface. When an acid is used as a dispersion medium, the sodium ions of a water-soluble alginate such as sodium alginate are replaced with hydrogen ions, and a layer of water-insoluble gel-like alginic acid is formed on at least the surface. It is transformed into granules.

Further, when alcohol is used as a dispersion medium, water molecules in a hydrated state with the water-soluble alginate are dehydrated by the dehydrating action of the alcohol, so that the water-soluble alginate itself becomes insoluble in water and becomes granulated. Next, in the manufacturing method, sodium alginate is first dissolved in water, and a deodorizing fine powder is mixed therein. Then, this liquid mixture is dropped into a dispersion medium to form granules, which are then washed and dried to obtain deodorizing granules. In addition, the deodorizing fine powder agent is an aggregate of particles in which zinc oxide, titanium dioxide, and water molecules are tightly bound together (
JP-A-6354935) or activated carbon can be used.

The manufacturing principle and manufacturing method of the deodorizing granules have been described above, and the manufacturing line 1 thereof will be explained below.

The melting tank 2 is a cylindrical tank, which includes a homomixer 6 for mixing the deodorizing fine powder with the alginate aqueous solution, and a homomixer 6 for storing the deodorizing fine powder and transferring the appropriate amount to the melting tank 2.
It has a hopper 7 for supplying the water. Further, from the bottom of such a dissolution tank 2, a tank 1 provided at the top of the granulation device 3 is connected.
A mixed liquid supply pipe 11 is provided to 0, and this mixed liquid supply pipe 1
1 is provided with a pump P. Further, the granulating device 3 includes this tank 10 and a granulating tank 13. The tank 10 has a plurality of holes in its bottom, each of which has a nozzle 14 attached thereto. Further, this tank 10 is movable up and down, so that the distance between tank 0 and the surface of the calcium chloride aqueous solution serving as a dispersion medium in a granulation tank 13, which will be described later, can be changed. Incidentally, by adopting such a structure and making it possible to change the falling distance of the droplet, it is possible to change the state during the droplet falling. That is, for example, if the falling distance is increased, even if the fluid is initially flowing continuously from the falling part 16a, the fluid will accelerate during falling and by the time it falls into the granulation tank 13 due to surface tension. It can be made to be in a droplet state. Furthermore, if the droplet is sufficiently accelerated by increasing the falling distance, the droplet will be divided into a plurality of large and small particles due to the impact upon landing, forming granules of various sizes. Incidentally, by classifying the granules having a mixture of sizes, it is possible to obtain granules with a small diameter that cannot be obtained by the dropping method. Further, for example, when droplets with a large diameter are dropped, the falling distance may be shortened to prevent the droplets from collapsing upon collision with the dispersion medium in the granulation tank 13. In addition, as a method of changing the falling distance of droplets,
In addition, the granulation tank 13, which will be described later, may be moved up and down, or the level of the calcium chloride aqueous solution in the granulation tank 13 may be changed. On the other hand, the nozzle 14 is for dripping into the tank 10, and has a tube body 15 and a thin wire-like edge body 16, as shown in FIG. is formed to extend from the end of the tube body 15. The portion of the edge 16 extending from the end of the tube 15 is a characteristic component of the present invention, and is defined as the dripping portion 16a since dripping is substantially performed in this portion. Also, this dripping part 16a
In addition to being formed straight in the vertical direction as shown in Fig. 2 (a), they may be formed obliquely to the vertical direction as shown in Fig. 2 (b), or as variations thereof, as shown in Fig. 2 (C)
As shown in Figure 2(d), there are also bow-shaped ones and
As shown in FIG. 2, a particle size adjusting portion 17 having an approximately annular shape may be provided in a part thereof. Incidentally, if the dripping part 16a is formed obliquely with respect to the vertical direction or in an arcuate shape,
The interval between drops can be made faster. Also, the dripping part 16a
By providing the particle size adjusting portion 17 in a part of the droplet, it is possible to drop droplets with a larger diameter than in the case where the particle size adjusting portion 17 is not provided. Note that the edge body 16 is connected to the tube body 15 as in this embodiment.
In addition to penetrating the inside of the tube body 15, it may be provided only near the end of the tube body 15. Furthermore, the rim 16 within the tubular body 15 may have a spiral shape as shown in FIG. Also tank 10
An outflow pipe 18 is provided near the upper side of the tank 10 to return overflowing liquid to the melting tank 2 when vft and m in the tank 10 exceed a certain level. The granulation tank 13 has a funnel-shaped bottom and a liquid guide pipe 19 is attached thereto, in which an aqueous calcium chloride solution serving as a dispersion medium is stored. Next, the cleaning device 4 will be explained. This device is equipped with a conveyor device 20 and a liquid tank 21, and is a device for washing away calcium chloride components while the granules supplied from the liquid guide pipe 19 are being transferred by the conveyor device 20. The conveyor device 20 is provided above the liquid tank 21, and includes a fine mesh conveyor belt 20a, a drive pulley 20b, and a driven pulley 20C, and is driven by a motor M to rotate a drive boo U20b and conveyor heald 202a. advance forward. The conveyor device 20 is also provided with two shower devices 22 and 23 in the middle thereof. Incidentally, of these two shower devices, the shower device 22 that is closer to the granulation device 3 is used to transport the granules on the conveyor device 20, using the water that has been collected in a water tank 25, which will be described later, and which is first used as washing water. The other shower device 23 is for sprinkling fresh water on the granules for complete cleaning. Note that the cleaning water in the water tank 25 is pumped up by the pump P2. Also, liquid tank 2
1 is kept away from the calcium chloride aqueous solution 24 and the water tank 25.

The calcium chloride aqueous solution tank 24 is placed near the granulator 3, and a separation membrane 26 is provided within the tank to further divide the tank into the granulator 3 side and the other side. Note that this separation membrane 26
It is preferable to use a material that blocks the permeation of sodium chloride components. That is, sodium chloride generated by the reaction between sodium alginate and calcium chloride in the granulation tank 13 is collected as an aqueous solution together with calcium chloride in the calcium chloride aqueous solution tank 24 from the liquid guide pipe 19 through the conveyor device 20a. Therefore, if only the calcium chloride component can be recovered into the calcium chloride aqueous solution tank 24 of the three granulating apparatuses, the granulation efficiency can be increased.

The calcium chloride aqueous solution tank 24 of the three granulating apparatuses is provided with a lid 27 to prevent liquid from entering from above, and a return pipe 28 having a pump Pa is provided below the lid 27. Incidentally, this return pipe 28 is for supplying the recovered calcium chloride to the granulation tank 13 again.

On the other hand, the water tank 25 has a dish-shaped washing water receiving part 29 at its upper part, and the water that falls into this washing water receiving part 29 is collected from the water tank 2.
It is designed to accumulate within 5. In addition, the conveyor device 20
is followed by a drying step.

The dropping nozzle for granulation and the granulation device using the same according to the present invention have the structure as described above, and the operating state ff of this device will be explained below. First, melting tank 2
A sodium alginate aqueous solution is prepared, and the required amount of deodorizing fine powder is mixed therein and stirred. Next, this mixed liquid is supplied to the tank 10 via the mixed liquid supply pipe 11. In this way, the mixed liquid drops into the granulation tank 13 as droplets from each nozzle 14, reacts with calcium chloride as a dispersion medium in the granulation tank 13, and forms a droplet on the surface or inside of the droplet. A layer of water-insoluble calcium alginate is formed to form granules. When the dispersion medium is an acid, a layer of water-insoluble alginic acid is formed on the surface or inside of the droplets to form granules, and when the dispersion medium is alcohol, the alcohol is dehydrated. Due to the action, the hydration state with water is released, and the sodium alginate itself becomes insolubilized and becomes granules. The thus produced granules are supplied onto the conveyor heald 20a through the liquid conduit 19 together with the calcium chloride aqueous solution.

In the conveyor belt 20a, only the granules remain on the conveyor device 2Oa, and the aqueous solution in which calcium chloride and sodium chloride are dissolved falls into the calcium chloride aqueous solution layer 24. Incidentally, the calcium chloride component in the aqueous solution that has fallen into the aqueous calcium chloride solution N24 permeates through the separation membrane 26, passes through the return pipe 28, and is recovered into the granulation tank 13. Further, the granules are then transferred by the conveyor device 20, and on the way the shower device 22.2
After the calcium chloride component is washed away in Step 3, the pellets are transferred to a drying step, where they are dried to obtain deodorized granules.

(Effects of the Invention) In the present invention, the nozzle 14 has a thin wire rod 16, and this wire rod 16 has a dripping portion 16a extending from the end of the tube body 15.
Because it has, droplets can be dropped at quick intervals,
Manufacturing speed can be increased.

Furthermore, if the dripping portion 16a of the wire rod 16 is formed obliquely with respect to the vertical direction, the dropping can be made even faster, which further increases manufacturing efficiency.

Furthermore, if a particle size adjustment part 17 is provided in the dripping part 16a of the wire rod 16, by changing the diameter of this particle size adjustment part 17, it is possible to manufacture granules with a relatively large diameter. Dimensions can also be easily adjusted.

Furthermore, if it is possible to change the distance between the dripping part 16a of the wire rod 16 and the liquid level of the dispersion medium in the granulation tank 13, for example, by increasing this distance, the fluid will initially drop. Even when the fluid is flowing continuously from the part 16a, the fluid accelerates while falling, and due to surface tension, the fluid flows into the granulation tank 13.
It can be made to be in a droplet state at the time it falls. Also, if the droplet is accelerated enough by increasing the falling distance,
When the droplet lands on the water, the impact splits the droplet into multiple sizes, creating granules of various sizes. By classifying the granules of various sizes thus produced, it is possible to produce granules with small diameters that cannot be obtained by dropping from a nozzle. For example, when droplets with a large diameter are dropped, this distance may be shortened to prevent the droplets from collapsing upon collision with the dispersion medium in the granulation tank 3.

[Brief explanation of drawings]

Fig. 1 is a side view showing a production line for deodorizing granules using the granulation device of the present invention, Fig. 2 is a vertical side view showing various embodiments of the dripping part in a wire rod, and Fig. 3 is the same as above. FIG. 1; 2; 3; 4; 6; 7; 10; 11: 13; 14; 15; 16; 6a 17; 18; 19; Pipe granulation tank nozzle pipe body wire rod; dripping part particle size adjustment part outflow pipe liquid conduit pipe conveyor device; conveyor belt 20b; drive pulley 20C; driven pulley 21; liquid tank 22, 23; shower device 24; calcium chloride aqueous solution tank 25 Water tank 26; Separation membrane 27; Lid 28; Return pipe 29; Cleaning water receiver D; Granules M; Motor PL, p, P3; Pump

Claims (4)

[Claims] (1) The liquid in the tank is dropped from a nozzle provided in the tank into the dispersion medium in the granulation tank provided below the tank, and the liquid is insoluble in the dispersion medium due to a reaction between the components of the dispersion medium and the liquid. In the apparatus for producing granules, the nozzle has a tube body and a thin wire body, and the wire body has a dripping part extending from an end of the tube body. nozzle. (2) The dropping nozzle for granulation according to claim 1, wherein the dropping portion of the wire body is formed obliquely with respect to the vertical direction. (3) The dropping nozzle for granulation according to claim 1 or 2, characterized in that the dropping portion of the wire body has a particle size adjusting part in which the wire body is formed into a substantially annular shape. (4) The granulation dripping nozzle according to claim 1, 2 or 3, characterized in that the distance between the dripping part of the wire body and the liquid level of the dispersion medium in the granulation tank can be changed. Grain device.