JPS6026506A - Device for distributing powdered material - Google Patents

Abstract

PURPOSE:To distribute a powdered or a particulate material in an arbitrary ratio, by installing a chute bottom plate which is connected to the top part of a powdered material feed pipe and has a slanted angle approximately equal to the angle of repose of the powdered material. CONSTITUTION:A powdered material, fed as shown by an arrow mark (a) from thr lower part of a powdered material feed pipe 1, is raised in a condition to fill the powdered material feed pipe 1 therewith. The powdered material so supplied is swollen in a cone at the top part of the powdered material feed pipe 1 depending upon the angle of repose inherent in the powdered material. When the supply of the powdered material is further continued starting with this state, the powdered material swollen in a cone is slipped down onto a chute bottom plate 2 along a slope inclined at the angle of repose. During such slip, the powdered material is divided by means of chute partitions 3, the slip of the powdered material onto each chute bottom plate 2 is distributed in a ratio proportioning a distance between the partitions 3.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a powder dispensing device for distributing powder or granules in arbitrary proportions.

In various technical fields of industry, there is a demand for the development of equipment that can accurately divide and distribute powder or granular materials (hereinafter simply referred to as powder 5) at a constant ratio.

For example, in a fluidized bed combustion device, in order to obtain good combustion or to reduce the emission of pollutants such as nitrogen oxides, the fuel must be distributed and supplied to the fluidized bed as evenly as possible throughout the entire fluidized bed. There is a need to do.

Therefore, for a fluidized bed combustion apparatus, a device for evenly dividing and distributing a certain amount of granular fuel to a large number of fuel supply nozzles is essential.

A conventional powder supply device is shown in FIG. 1 and will be described.

In the figure, the same number of fuel supply nozzles as fuel supply nozzles 1
02 is provided, and the fuel is cut out for each fuel supply nozzle through the fuel hopper 101 and the above-mentioned fuel quantitative supply device 102, and is supplied to the air nozzle 104, and the fuel is supplied to the air conveyance path 10.
5, it was designed to lead to each fuel supply nozzle.

By doing this, the fuel is distributed evenly to each fuel supply nozzle, but a large number of fuel constant supply machines and associated control devices are required, which makes the entire system complicated. This method is complicated and expensive, and has the drawback of increasing power consumption for individually driving a large number of fuel metering devices.

As an alternative to this, the supply distribution device shown in FIGS. 2 and 3 has been proposed.

First, the device shown in FIG.
The air is distributed along air streams that branch out from air flow path 07 into a large number of air conveyance paths 105.

However, the flow of air branching from the collection tube 107 to the air conveyance path 105 is largely influenced by the ventilation resistance of the air conveyance path 105, and the air flow rate is not necessarily uniform for each air conveyance path 105. The drawback was that highly accurate and even fuel distribution was not possible.

As an improvement on this, a distribution means shown in FIG. 3 has been proposed. In the figure, the conduit 106 is branched into two conduits 107', which are further divided into two conduits 108,
The conduit 108 is then sequentially branched into two conduits 109 to divide the air flow as accurately as possible.

However, in order to divide the air evenly into each branch pipe, it is necessary to install a considerable length of straight pipe section before and after the branch pipe to rectify the flow, which requires a considerably large space occupied by the piping. There was a drawback.

As shown in FIGS. 2 and 3, distributing during the transportation process has the drawbacks of not being able to perform highly accurate distribution and requiring a large space; In the case of pneumatically conveying pre-distributed materials, there are technical problems in that the entire device becomes complicated and power consumption increases.

The present invention aims to solve the above-mentioned conventional drawbacks or technical problems and to provide a powder dispensing device that has high dispensing accuracy, has a simple structure, and occupies less space.

That is, in the present invention, a powder supply pipe is vertically installed, connected to the top of the powder supply pipe, and inclined at an angle approximately close to the angle of repose of the powder, and the outer periphery of the powder supply pipe is set at an arbitrary angle. A plurality of chrysanthemum-petal-shaped chute bottom plates are divided into angles, and a seven-piece partition is provided at the joint of the plurality of chute bottom plates, and the powder is supplied from the bottom of the powder supply pipe. This is a book that distributes powder by sliding it freely along the angle of repose.

In the second invention, a scraper is provided facing the top of the powder supply pipe, and the powder transferred by the powder supply pipe is scraped off by the scraper, and the powder is distributed to each chute. It is something.

In a third invention, the chute bottom plate is sealed with a cover plate, and a conveying air duct is connected to this, so that the powder scraped off and distributed by the scraper is directly conveyed by air. be.

An embodiment of the present invention will be described in detail below. In FIG. 4 (plan view) and FIG. 5 (longitudinal cross-sectional view), reference numeral 1 denotes a powder supply pipe that stands vertically. Reference numeral 2 denotes a chute bottom plate, one end of which is connected to the top of the powder supply pipe 1 so as to be inclined at an angle close to the angle of repose of the powder. In addition, this chute bottom plate 2 divides the outer circumference of the powder supply pipe 1 into arbitrary angles,
Multiple pieces are arranged in the shape of chrysanthemum petals. In the case of FIG. 4, as an example, the case where the angle is divided into eight equal parts is excluded. 3ti The chute partition walls are provided upright at the joints of the plurality of chute bottom plates 2 to form divided entrance portions of the chute bottom plates 2. A chute side wall 4 is continuously joined to the chute bottom plate 3 and is erected along the inclined surface of the chute bottom plate 2. 5 is a discharge pipe provided at the final end of the chute bottom plate 2.

In this embodiment configured as above, the powder supply pipe 1
The powder that has been supplied downward as shown by arrow A rises while the powder supply pipe 1 is filled with it. The powder thus supplied is placed at the top of the powder supply pipe 1.
It rises in a conical shape according to the powder's unique angle of repose. If the supply continues from this state, the powder that has risen into a conical shape will become
It slides down onto the chute bottom plate 2 along the slope of the angle of repose. In this process, the powder is divided by the chute partition walls 3, and the amount of powder falling onto each chute bottom plate 2 is distributed at a ratio according to the spacing between the partition walls 3. The powder, which is distributed in a desired ratio in this manner and slides down onto the chute bottom plate 2, then slides down along the slope of the chute bottom plate 2 and is distributed to a predetermined location through the discharge pipe 5. .

Next, a second embodiment shown in FIG. 6 (plan view) and FIG. 7 (longitudinal sectional view) will be described.

In the figure, the difference from the first embodiment shown in FIGS. 4 and 5 is that a scraper is provided facing the top of the powder supply pipe 1.

In the figure, 6 is a rotating shaft of the scraper, which is rotated by a drive device (not shown). Reference numeral 7 denotes a plurality of blades attached to the rotating shaft 6, and the blades 7 are shaped so as to push the powder outward when rotated in the direction of the arrow.

In this second embodiment, the powder that has filled the powder supply pipe 1 and been pushed up is successively further pushed outward by the blades 7 of the scraper. The powder thus pushed out is distributed in an arbitrary ratio by the chute bulkhead 3, slides down onto the chute bottom plate 2, then slides down on the chute bottom plate 2, and then passes through the discharge pipe 5 (see Fig. 5). is discharged.

The second embodiment is suitable for powders with a small angle of repose, such as relatively fine powders or those containing moisture.

Next, a third embodiment shown in FIG. 8 (plan view) and FIG. 9 (longitudinal sectional view) will be described.

The third embodiment differs from the first and second embodiments in that the chute bottom plate is sealed to allow direct pneumatic conveyance.

In the figure, reference numeral 11 is a clad plate, which is provided so as to cover the chute partition wall 3, the upper surface of the chute side plate 4, and the upper surface of the crane blade 7, thereby sealing the chute bottom plate 2.

14 is an annular conveying air duct with reeds, and the lid plate 11
The air blown through the main air duct 12 is guided to the annular duct 14 via the conical duct 13, and is divided into arbitrary ratios by the chute bulkhead 3 (the eighth
(see figure) and is formed to flow along the slope of the chute bottom plate 2.

In the figure, 8 is a connecting member for connecting the drive device 9 and the rotating shaft 6 of the screener, and 10 is a support member for the drive device 9.

In the third embodiment configured as described above, the powder that is supplied from the direction of arrow A, fills the powder supply pipe 1, and is pushed up is pushed outward by the blades 7 of the scraper. Meanwhile, it is distributed in an arbitrary ratio by the chute partition wall 3 and slides down onto the chute bottom plate 2. The powder that has slipped down on the chute bottom plate 2 in this way is blown from the annular conveying duct 14, carried by the air flow flowing along the slope of the chute bottom plate 2, and then passed through the discharge pipe 5. It is transported as it is to a predetermined location.

As described in detail above, according to the powder distribution device of the present invention, the powder supply pipe is vertically erected, and the plurality of chute bottom plates are connected to the powder supply pipe at an angle of inclination approximately equal to the angle of repose of the powder. Since the chute bulkhead is installed at the joint between the chute bottom plates, the powder supplied from below through the powder supply pipe will slide down the chute according to the angle of repose of the powder. It could be distributed in any ratio by means of partitions.

In addition, a scraper is provided facing the top opening of the powder supply pipe to push out the powder that is being supplied to the outside, so regardless of the properties of the powder, it is forced through the chute partition wall. It was possible to allocate it evenly.

Furthermore, by sealing the shade bottom plate and connecting the conveying air duct to it, the powder can be directly conveyed by air without the need for a complicated air duct.

By distributing the powder in advance in an arbitrary ratio in this way, even if the flow path resistance of the air conveyance path differs, the distribution of the powder to be conveyed is not affected in any way, and the distribution of the powder is ensured. It will be held on.

Further, since the powder is transferred while filling the inside of the powder supply pipe, the amount of powder supplied can be quickly adjusted, and the amount of powder supplied can be finely adjusted and controlled with high responsiveness.

Furthermore, since the structure is simple, the space occupied by the device is small, and since there are few moving parts, the power consumption required for this is greatly reduced, which improves distribution function, controllability, space occupancy, and economical aspects. It has excellent effects in all respects.

[Brief explanation of drawings]

1 to 3 are diagrams schematically showing a conventional dispensing device. 4 to 9 show embodiments of the present invention. Fourth
The figure is a plan view of the first embodiment, and FIG. 5 is a longitudinal cross-sectional view taken along line A--A in FIG. 4. FIG. 6 is a plan view of a main part of the second embodiment in which a scraper is provided, and FIG. 7 is a longitudinal cross-sectional view taken along the line A--A in FIG. 6. Figure 8 shows the chute bottom plate 1...
Powder supply pipe 2... Chute bottom plate 3... Chute partition wall 4... - Chute side wall 5... Discharge pipe 6... Rotating shaft 7... Scraper blade (scraper) 11-
・・Lid plate °-1. ．． 1st part'■゛ ゛ 101 03 箪 21 sentences 5th diagram/Figure 6

Claims (3)

[Claims] (1) A powder supply pipe installed vertically, connected to the top of the powder supply pipe and having an inclination angle approximately close to the angle of repose of the powder, and dividing the outer circumference of the powder supply pipe into arbitrary angles. A powder distribution device comprising a plurality of chrysanthemum petal-shaped chute bottom plates and a chute partition wall erected at the joint of the plurality of chute bottom plates. (2) A powder supply pipe installed vertically, connected to the top of the powder supply pipe, with an inclination angle tl close to the angle of repose of the powder, and the outer periphery of the powder supply pipe is divided into arbitrary angles. a plurality of shoot bottom plates provided in the shape of chrysanthemum petals, and the plurality of shoot bottom plates;
A powder distribution device comprising a chute partition wall installed upright at the joint of the plurality of chute bottom plates, and a scraper provided facing the top opening of the powder supply pipe. (3) A powder supply pipe installed vertically, connected to the top of the powder supply pipe and having an inclination angle approximately close to the angle of repose of the powder, and dividing the outer periphery of the powder supply pipe into arbitrary angles. It consists of a plurality of chrysanthemum petal-shaped chute bottom plates, a chute partition wall erected at the joint of the plurality of chute bottom plates, and a scraper provided facing the top opening of the powder supply pipe, A powder distribution device characterized in that the chute bottom plate is provided with a lid plate and sealed, and a conveying air duct is connected to the sealed chute bottom plate.