WO1989002866A1

WO1989002866A1 - Apparatus for preventing segregation of particulate bodies

Info

Publication number: WO1989002866A1
Application number: PCT/JP1987/000720
Authority: WO
Inventors: Takashi Yamamoto; Yoku Shiraishi; Masaaki Uno; Masaaki Shin
Original assignee: Mitsui Toatsu Chemicals, Incorporated
Priority date: 1987-09-30
Filing date: 1987-09-30
Publication date: 1989-04-06

Abstract

This invention provides an apparatus for preventing the segregation of particulate bodies, in which a pipe having a plurality of branch pipes is provided in a storage vessel so that the pipe extends from a particulate body feed port of the storage vessel to the bottom portion thereof. Thus, the rolling distance of the particulate bodies is reduced to prevent the segregation of the particulate bodies. This segregation preventing apparatus is useful as a particulate body storage apparatus having a small particle-size variation.

Description

Specification

Powder segregation prevention device

Technical field

TECHNICAL FIELD The present invention relates to an apparatus for preventing segregation of a granular material. More specifically, the present invention relates to an anti-folding device capable of uniformly storing powders and granules regardless of the shape of a storage tank.

When powder is deposited or supplied to a storage tank,

Granules accumulate in a conical shape, the top of which is directly below the feed point and slopes to the side with a repose angle. Surgery just below the supply point

Fine powder accumulates on the surface, and coarse powder rolls down the slope and collects on the side. This phenomenon becomes more pronounced as the difference between the specific gravity and the particle size of the granules increases, and more pronounced as the diameter of the storage tank increases. In the case of a mixture of various types of powder and granules such as fertilizers and chemicals, if such phenomena occur, the difference in components appears and poses a serious problem. Is considered. Devices that solve these problems include, for example,

(1) Batch loading device (Fig. 1)

(2) Uniform feeder that rotates the feed port (Fig. 2)

(3) Equipment with perforated piping (Fig. 3)

(4) Storage tank with partition walls (Fig. 4)

and so on.

However, the device of (1) uses the top of the accumulated granular material. If they are put in batches in the vicinity one by one, the sedimentation rate is certainly faster than the rolling speed of the granules, so the effect of preventing segregation is improved. In such cases, the equipment cost increases, and there are many maintenance problems, including countermeasures for failures.

In the device of (2), since the supply port always moves while drawing a circle, the top has a circular shape with a certain radius. As a result, the rolling distance of the granular material is shortened and the effect of preventing segregation is obtained.However, when the shape of the storage tank is other than a cylinder, for example, when the cross section of the storage tank is a sector shape, the vertical ratio is very different. In the case of a rectangular shape, the effect is not as expected. In the device of (3), since the position of the top of the granular material differs with time, and the rolling position changes accordingly, a layer of granular material with less segregation can be obtained. However, if the cross section of the storage tank is not a circle or the inside diameter of the storage tank is very large, the distance from the top of the sedimentary layer of the granular material to the side of the storage tank becomes longer, and the effect is reduced by half. .

In the device of (4), since the partition wall is provided in the storage tank, the rolling distance of the powder is short, which greatly contributes to the prevention of segregation. Since it is necessary to use equipment with a certain degree of strength, there are disadvantages in that it is impossible to install it in an existing storage tank in terms of strength, and that even if it is newly built, the equipment becomes expensive. Also, when extracting from the storage tank because the area surrounded by the partition is narrow In addition, there is a danger that a clogging phenomenon may occur depending on the granular material. Therefore, it is desired to provide a simple segregation preventing device which prevents segregation of the granular material in any type of storage tank and does not require equipment cost.

Disclosure of the invention

An object of the present invention is to solve the above-mentioned problems and to provide an apparatus capable of preventing segregation of powder particles in a storage tank of any shape.

Another object of the present invention is to provide an inexpensive apparatus for preventing segregation of powders, which is lightweight and easy to manufacture.

The above object of the present invention is achieved by attaching a conduit having a branch pipe to a supply port. In other words, according to the present invention, a conduit having a branch pipe is provided from the granular material supply port of the storage tank to the bottom, and the position and length of the branch pipe are determined and arranged so as to adapt to the shape of the storage tank. This is a device for preventing segregation of powder and granules for supplying powder and granules to a storage, characterized in that the powder and granules can be stored uniformly.

BRIEF DESCRIPTION OF THE FIGURES

FIGS. 1 to 4 show examples of a device conventionally used to prevent segregation. FIG. 5 shows an example of the segregation prevention device of the present invention, and FIG. 7 and 8 are views showing one example of a conduit having a branch pipe employed in the present invention.

New paper 1 to 6, (a) is a schematic view from the top of the storage tank, and (b) is a cross-sectional view of the groove of the storage tank.

In the figure, 1 is a supply port, 2 is a pipe, 3 is a perforated S pipe, 4 is a bulkhead, 5 is a conduit, 6 is a branch pipe, and 7 is a discharge port.

BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be described in detail with reference to FIG.

In the present invention, the term “granules” generally means powders or granules having a particle size of ΙΟ, ΟΟΟ or less, and the types thereof include cereals, chemical products such as cement, fertilizers, resins, and coal. There are minerals such as sand.

The storage tanks of the present invention include silos, tanks, vans, bins, and hoppers.

In the conduit having a branch pipe according to the present invention, as shown in FIG. 5, 導管 -η (η is the number of branch pipes) is attached to the conduit 5 from the branch pipe B-1 at an angle smaller than the angle of repose. The length of each of the branch pipes B-1 to Β-η is determined by the distance between the conduit 5 and the side of the storage tank, and is 1/3 to 2/3 of the distance between the conduit 5 and the side of the storage tank. It is appropriate to have a supply port at the location. Also, the difference between the heights of the supply ports of the branch pipes B-1 and 0.1-2 is 0.1 to 5 m, more generally 0.2 to lm, and the value of n is the height of the storage tank. Determined by

In the present invention, the granular material continuously sent to the supply port first passes through the outlet at the lower end of the conduit 5 and accumulates at the bottom of the storage tank.

New paper You. The peak of the accumulated powder gradually rises, and when it reaches the outlet, the powder surface rises in the conduit 5 and reaches the level of the branch B-1. From the exit, deposition starts again in the storage tank. At this time, depending on the length, position, and orientation of the branch pipe B-1, the position of the apex when the particulate matter accumulates differs from the location of the conduit outlet, and the particulate matter accumulates from the conduit outlet. A form different from the form is overlaid on it.

Thereafter, when the top of the powder reaches the outlet of the branch pipe B-1, the powder surface rises again in the conduit 5, and is discharged from the branch pipe B-2. Similarly, it is returned to the branch pipe Β-η, the discharge outlet changes sequentially, and each time the inside of the storage tank is filled with a new accumulation form. Of course, it is possible to bring the vertices of the granular material throughout the storage tank depending on the length and direction of the branch pipe Β-1 to the branch pipe Β-η at this time. This form of deposition reduces the rolling distance and reduces segregation. Even if there is a temporary deviation due to rolling, coarse particles and fine particles tend to be dispersed in a thin layer, and the deviation such as a remarkable fine layer and coarse layer as in the past is also observed. In addition, even when the material is extracted from the bottom of the storage tank, a material having little variation in particle size distribution and having no change in components can be obtained. In the granular material segregation apparatus of the present invention, a conduit having a branch pipe may be provided at the center of the storage tank. 5 As shown in Fig. 5, the interior can be divided vertically into two or more sections, and the branch pipes corresponding to the number can be installed. However, in the case of a relatively small storage tank, it is generally preferable to divide into three.

The thickness of the conduits and branch pipes varies depending on the properties of the granular material to be handled.For example, in the scale of the apparatus shown in Fig. 6 described below, the conduit diameter is 150 mm and the branch pipe diameter is about 100 mm. If the thickness is excessively reduced, it is determined as appropriate considering the cause of the blockage phenomenon. Also, n of the branch pipe is appropriately determined depending on the properties of the granular material, but in a storage tank having a capacity as shown in FIG. 6, it is preferable that n is about 10 to 25. Of course, the length of the branch pipe can also be changed as appropriate and can be deformed as shown in Fig. 7, and as shown in Fig. 8, the direction of the branch pipe depends on the location of the conduit. Can also be provided.

Hereinafter, the present invention will be described specifically with reference to Examples, but the present invention is not limited to these Examples. As shown in Fig. &, The equipment used in the experiment was a `` deformation storage tank '' that vertically divided the inside of a hopper with a diameter of 4.5 m, a cylindrical part height of 5 m, and a circular protruding part height of 5 m into three parts. A near the center of the supply port is A, C is outside, and B is B. Granule you supplied, 2min Furui on 5 less than ¾, 2 ⁵ 0 Furui under less than 10¾, it is 2min Furui under and 250 mu on sieve 85 or more.

Sheep paper Example 1

A 6m long, 150min diameter pipe with a branch pipe with a diameter of 100mm as shown in Fig. 7 is installed vertically at supply port B. The position, length and direction of the branch pipe were determined based on the distance between the tank side and the conduit, and the positions of the front and rear branch pipes. In this case, n is 1.5. The granular material was supplied from the supply port B at a rate of 500 kg / Hr and maintained for 24 hours. When the 12 ton powder stored in this storage tank was discharged from the outlet 7, the particle size distribution was measured every 500 kg.

Example 2

Using the same equipment as in Example 1, the supply rate was 125 kg / Hr, the supply was continued for 4 days, and the particle size distribution was measured in the same manner.

Example 3

As shown in Fig. 8, a pipe with a different length, direction, and position of the branch pipe was attached to the supply port A as shown in Fig. 8, and the particle size distribution was measured in the same manner as in Example 1.

Comparative Example 1

From the supply port A, powder is supplied at 500 kg / Hr without using a conduit with a branch pipe. The powders fall freely from the supply port A and accumulate just below the supply port. The particle size distribution was measured similarly.

Comparative Example 2

Use a conduit with a branch pipe from supply port B None, the powder was supplied at 125 _kg / Hr for 4 days, and the particle size distribution when discharged from the outlet 7 was measured in the same manner.

Comparative Example 3

The powder was supplied from the supply port C for 24 hours at 500 kg / Hr without using a conduit having a branch pipe, and the particle size distribution when the powder was discharged from the discharge port 7 was measured.

Comparative Example 4

A 6-meter-long pipe with a diameter of 150 mm and a 100-mm-diameter hole spirally attached to supply port B is installed vertically. The powder was supplied from supply port B at 125 kg / Hr for 4 days, and the particle size distribution was measured in the same manner at the time of discharge.

Table 1 shows the particle size distribution results of Examples 1-3 and Comparative Examples 1-4. -

(l)

000 / 8df / JOd 9S98 / 68 OAV

The granules supplied by using the conduits having the branch pipes of Examples 1 to 3 did not cause swelling, had no large variation in the average particle size, and had a weight percentage of 3 nim or more. In addition, the weight percentage of less than 100 μ hardly changed, and the result was that very average powder was discharged from the bottom of the storage tank.

In the comparative example, when discharged from the bottom of the storage tank, a fine powder region and a coarse particle region were always present in any of the initial, middle and late stages, and segregation occurred.

From the above results, it is apparent that the apparatus for preventing segregation of granular material of the present invention is very excellent in preventing segregation when providing the granular material to the storage tank without being restricted by the shape of the storage tank. Device.

New paper

Claims

The scope of the claims

1. Install a conduit with a branch pipe from the powder supply port of the storage tank to the bottom, and determine the position and length of the branch pipe so that it conforms to the shape of the storage tank and place it S to make the powder and granules uniform. A device for preventing segregation of powder and granules for supplying powder and granules to a storage tank, characterized in that the powder and granules can be stored in a storage tank.

2. The apparatus according to claim 1, wherein the inside of the reservoir is vertically divided, and a conduit having a branch pipe is provided in each of the divided spaces.

3.3 According to Claim 2, which is divided

4. The apparatus according to claim 1, which is a conduit having a branch pipe installed at an angle equal to or less than the angle of repose.

New paper