JPH0595601U - Stock solution distributor for centrifugal atomization - Google Patents

Abstract

(57) [Summary] [Purpose] In the stock solution distributor of the centrifugal spray dryer,
The purpose is to make it possible to quantitatively supply the stock solution in any state. [Structure] A stock solution for centrifugal spraying which supplies a stock solution such as ceramic slurry to a centrifugal spray drying apparatus, wherein the stock solution is received from the upper part and the stock solution is supplied to the centrifugal spray drying apparatus from the lower part. The stock solution distributor for centrifugal spraying is provided with a stirring mechanism for generating a swirling flow of the stock solution.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a stock solution distributor for centrifugal spraying, and more particularly to supplying a stock solution of mud-like ceramic slurry to a centrifugal spray dryer at a uniform flow rate and flow rate.

[0002]

[Prior Art]

 The ceramic molded body is formed by drying an undiluted solution of a mud-like ceramic slurry with a drying device into powder and granules, and press-molding and firing the powder and granules. In the conventional centrifugal spray-drying apparatus shown in FIG. 4, a rotary shaft 103 is inserted into a stock solution supply pipe 102 arranged at the center of the upper part of a drying chamber 101, and a lower end of the rotary shaft 103 is connected to a lower end of the stock solution supply pipe 102. The spraying disc 104 is fixed with a gap interposed.

A hot air inflow portion 105 to the drying chamber 101 is formed outside the stock solution supply pipe 102, and a hot air pipe 106 is connected to the hot air inflow portion 105. A lower portion of the drying chamber 101 is formed in a tapered shape with a large diameter in the upper portion and a small diameter in the lower portion, and the lowermost portion is opened as a product outlet 107. An opening 109 of an exhaust pipe 108 is located above the product outlet 107, and a cyclone 110 is interposed to open the exhaust pipe 111 to the atmosphere.

Here, when the undiluted solution G of the mud-like ceramic slurry is supplied onto the spray disk 104 rotated by the rotating shaft 103 through the undiluted solution supply pipe 102, the spray disk 104 rotates. Therefore, the stock solution G is jetted to the outside of the spray disc 104. When hot air is supplied to the drying chamber 101 through the hot air tube 106 and the hot air inflow portion 105, the spray-shaped stock solution G supplied to the drying chamber 101 is dried to be a granular material, and a product take-out port. It falls from 107.

Exhaust gas is discharged to the atmosphere through an exhaust pipe 108, a cyclone 110, and an exhaust pipe 111. The powdery particles contained in the exhaust gas are separated by the cyclone 110. By the way, as a stock solution distributor for supplying the stock solution G of the mud-like ceramic slurry to the centrifugal spray drying apparatus, there are the following. Some stock solution outlets shown in FIGS. 5 (a) and 5 (b) have a plurality of round holes. In this stock solution distributor 201, one stock solution pipe 203 is connected to a dish-shaped distributor 202, and a plurality of round holes 204 are formed at the bottom of the distributor 202. This is a basic type as a stock solution distributor in which a stock solution G reservoir 205 is provided above the distributor 202 and one stock solution pipe 203 is connected.

Further, there is a stock solution outlet having a slot as shown in FIGS. 6 (a) and 6 (b). In this stock solution distributor 301, two stock solution pipes 303 are connected to a container-shaped distributor 302, and an annular slot (groove shape) 304 is formed on the bottom of the distributor 302. This also has a stock solution G reservoir 305 above the distributor 301 and two stock solution pipes 303 connected to the stock solution G.

Next, there is a stock solution outlet shown in FIGS. 7A and 7B, which has a spiral hole. In this stock solution distributor 401, one stock solution pipe 403 is connected to a cylindrical container-shaped distributor 402, and a plurality of spiral holes 404 are engraved in the lower part of the distributor 402. A stock portion 405 of the undiluted solution G is formed on the upper portion.

[0008]

[Problems to be solved by the device]

 The above-mentioned conventional stock solution distributors 201, 301, 401 all have stock solution G reservoirs 206, 306, 406 in the distributors 202, 302, 402, respectively, and once stock solution G is stored therein. The stock solution G is distributed through the circular hole 204, the slot 304, and the spiral hole 404, and the stock solution G is quantitatively supplied to the centrifugal spray dryer.

However, when the stock solution G of the muddy ceramic slurry to be handled has a viscosity of 10 to 100 cps, a high sedimentation property, and a high drying property, the stock solution G in the distributor 202, 302, 402 is The powder of may settle and harden. As far as the specifications of the capability of the centrifugal spray drying device and the shape (size, distribution) of the granulated particles are allowed for such a stock solution G, a large amount of the stock solution G is supplied to the distributor 202.302. -A method has been taken to prevent sedimentation and dry sticking in the 402.

However, in some cases, the supply amount of the stock solution G cannot be increased because fine powder particles are formed, and the stock solution G settles and adheres in the distributors 202, 302 and 402. The stock solution G could not be uniformly supplied to the solution, and in some cases, the holes 204, the slots 302, and the spiral holes 404 were clogged. In the distributor 202 having the round holes 204 shown in FIG. 5, the undiluted solution G stays in the reservoir 205 and the undiluted solution G 2 is settled, and is easily fixed.

Further, in the distributor 302 having the slot 304 shown in FIG. 6, the stock solution G is supplied to the reservoir 305 from the two stock solution pipes 303, and a slight flow of the stock solution G occurs in the reservoir 305, but the stock solution G sinks. Not enough to prevent falling and sticking. Further, the distributor 402 having the spiral hole 404 shown in FIG. 7 also has the reservoir portion 405 as in the case of the distributor 202 shown in FIG. 5, and the stock solution G is settled and fixed.

That is, when the supply amount of the undiluted solution G in each of the reservoirs 205, 305, and 405 of the respective distributors 202, 302, and 402 is small, a stagnant portion of the undiluted solution G is formed, and the centrifugal spray drying device is dried. The stock solution G adheres to the inside of the distributors 202, 302, and 402, and it becomes impossible to quantitatively supply the stock solution G to the centrifugal spray dryer.

[0013]

[Means for Solving the Problems]

 Therefore, in view of the above circumstances, the present invention provides a centrifugal spray dryer with a mud-like ceramic slurry or the like so that the stock solution can be quantitatively supplied to the centrifugal spray dryer in any state. A stock solution distributor for centrifugal spraying that supplies the stock solution, which receives the stock solution from the upper part and provides a stirring mechanism to generate a swirling flow of the stock solution in the distributor that supplies the stock solution to the centrifugal spray dryer from the lower part. It is a stock solution distributor for centrifugal atomization.

[0014]

[Action]

 There is a mechanism that causes a swirling flow of the stock solution to prevent the powder in the stock solution from settling and sticking, and it is possible to quantitatively supply the stock solution to the centrifugal spray dryer even in any state.

[0015]

【Example】

 The present invention will be described in detail below based on specific embodiments shown in the accompanying drawings. According to the present invention, when the undiluted solution G of the muddy ceramic slurry is supplied to the distributor, the undiluted solution G flowing into the distributor generates a swirling flow in the same rotation direction as the spraying plate of the centrifugal spray drying device, and always self-processes. The inside of the distributor is kept in a stirring state to prevent the undiluted solution G from settling.

As shown in FIG. 1, the mechanism for generating the swirling flow is such that the supply tip portion 3 a of the stock solution pipe 3 to the distributor 2 is bent by about 90 ° and bent to enter the stock solution G into the distributor 2. The swirling flow indicated by the arrow may be generated by using the inflowing force of. A rotary shaft 6 for a spray disk of a centrifugal spray dryer is inserted through the center of the distributor 2, and a stock solution pipe 3 for supplying a stock solution G is connected to the upper part of the distributor 2 and its tip 3a. Is bent in the same direction as the rotary shaft 6, and a flow of the stock solution G is formed in the same direction as the rotary shaft 6. A slot 4 for supplying the stock solution G to the centrifugal spray dryer is engraved at the bottom of the distributor 2. Further, the bending angle of the tip portion 3a of the stock solution pipe 3 is not limited to 90 °, and may be any angle as long as a swirling flow is generated.

Further, as a method of generating the swirling flow, as shown in FIG. 2, a stirring blade 17 is projectingly provided on a rotary shaft 16 for rotating a spraying disc of a centrifugal spray drying device, and is housed in a distributor 12. There is a method of mechanically stirring the stock solution G. That is, one undiluted solution pipe 13 for supplying the undiluted solution G is connected to the upper portion of the distributor 12, the rotary shaft 16 of the spraying disk is positioned in the union 12, and the rotation is immediately used for stirring the undiluted solution G. ing. The bottom of the distributor 12 is provided with a slot 14 for supplying the stock solution G to the centrifugal spray dryer. Further, the number of stirring blades of the rotary shaft 16 is not limited to two, and any number suitable for stirring can be provided.

Further, as shown in FIG. 3, when the stock solution pipes 23 are attached to the distributor 22, each stock solution pipe 23 is bent horizontally at the upper part of the distributor 22 so that the stock solution G produces a swirling flow. The same effect can be obtained by arranging so that the inflow direction of the is the rotation direction. Reference numeral 26 is a rotary shaft of the centrifugal spray dryer. Here, a test for distributing and supplying the ceramic slurry was conducted using the stock solution distributor of the present invention shown in FIG. 1 and the stock solution distributor of FIG. 5 as a comparative example. As the undiluted solution of the ceramic slurry, one with an apparent viscosity of about 50 cps containing PVA and PEG and one with an apparent viscosity of about 2000 cps containing high molecular weight acrylic were used for 5 hours each, and then the undiluted solution supply holes Was checked for clogging.

As shown in Table 1, there was no difference when the apparent viscosity was about 50 cps, but when the apparent viscosity was about 2000 cps, most of the supply holes were clogged in the comparative example. In the embodiments of the present invention, no clogging occurred at all, and excellent results were shown.

[0020]

[Table 1]

[0021]

[Effect of the device]

 As described above, the present invention is a stock solution distributor for centrifugal spraying, which supplies a stock solution such as ceramic slurry to a centrifugal spray drying apparatus. The stock solution is received from the upper portion and the centrifugal spray drying apparatus from the lower portion. Since it is a stock solution distributor for centrifugal spraying that is equipped with a stirring mechanism that generates a swirling flow of the stock solution in the distributor that supplies the stock solution, it does not stick to the stock solution even if it is a highly sedimentable stock solution. A stable stock solution can be supplied.

Further, according to the present invention, since the stock solution is uniformly supplied to the spraying disk of the centrifugal spray-drying device, it is possible to consistently and uniformly supply dry powder and granules during operation. Further, in the present invention, since the coarse stock solution spray is not supplied from the distributor, the coarse stock solution spray is prevented from adhering to the inner wall of the drying chamber of the centrifugal spray dryer, and the yield is improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view and a lateral sectional view of a specific embodiment of the present invention.

FIG. 2 is a vertical sectional view and a plan view of another embodiment of the present invention.
It is a side view.

FIG. 3 is a perspective view of another embodiment of the present invention.

FIG. 4 is a vertical cross-sectional view of a conventional centrifugal spray dryer.

FIG. 5 is a vertical sectional view and a bottom view of a conventional stock solution distributor for centrifugal spraying.

FIG. 6 is a two-sided view showing a vertical sectional view and a bottom view of another conventional stock solution distributor for centrifugal spraying.

[Fig. 7] Fig. 7 is two views of a vertical cross-sectional view and a bottom view of still another conventional stock solution distributor for centrifugal spraying.

[Explanation of symbols]

 G ... Undiluted solution 2.12.22 ... Distributor

Claims (1)

[Scope of utility model registration request] 1. A stock solution distributor for centrifugal spraying, which supplies a stock solution such as ceramic slurry to a centrifugal spray drying apparatus, wherein the stock solution is received from an upper part and the stock solution is supplied to a centrifugal spray drying apparatus from a lower part. A stock solution distributor for centrifugal spraying, which is provided with a stirring mechanism for generating a swirling flow of the stock solution.