JP3419246B2 - Separation and discharge device for air transport of granular material - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powdery or granular material at the end of transportation of an air flow transporting device for transporting the powdery or granular material such as various minerals and grains with a gas flowing in a pipeline. The present invention relates to a separation discharge device that separates and discharges a carrier gas.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, in order to separate powder particles and carrier gas at the end of transportation of an air flow transportation device, as shown in FIG.
A mixed flow 3 of powder and granules and a gas is introduced in a tangential direction of the cylindrical container 1 through an introduction pipe line 2 and the mixed flow 3 is introduced in the container 1.
Is horizontally swirled, and the particles 4 and the gas 5 are separated by the action of centrifugal force and gravity generated at that time, and the particles 4 are separated from the discharge port 1a at the lower end of the container 1 and the gas 5
A cyclone separator is generally used that discharges the water from an exhaust pipe 1b provided at the center of the container 1.

[0003]

The cyclone separator, which has been widely used as a separator / exhaust device in the past, is often used as a dust collector for dust-containing air, and relatively small particles of about several tens of μm are used. Although it can be efficiently collected, on the other hand, there are problems as listed below as a separating and discharging device for air flow transportation.

A large volume of container is required because a volume is required to swirl the gas in the container. Since a swirling flow is generated in the gas, the pressure loss is large. Since the solid is swirling along the inner wall surface of the container and falls downward by gravity and is discharged, the moving speed of the solid downward is slow, and especially the solid concentration in the air flow becomes high,
When attempting to continuously discharge a large amount of powder or granules, the discharge of solids may be delayed, and the solids may accumulate in the container.

The present invention has been made in view of the above-mentioned problems in the conventional cyclone separator, and is compact, has a small pressure loss, and is capable of smoothly discharging the granular material. It is an object of the present invention to provide a separating and discharging device for pneumatic transportation.

[0006]

In order to achieve the above-mentioned object, the separation and discharge device for air transport of powder and granules of the present invention comprises a solid-gas separation section having a flow passage width in the flow direction of one of the introduction pipe passages. .5-3
The structure is such that it gradually and smoothly expands twice, and the flow direction of the introducing pipe is curved at a substantially right angle and downward, and an exhaust unit is provided near the center of the curve of the solid-gas separating unit. There is. And by doing in this way, the granular material is converted into the downward speed, and is guide | induced downwards, almost without reducing the speed which flowed through the introduction pipe line.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The separating / ejecting device for air current transportation of powder and granules of the present invention is provided with an introduction pipe for guiding a mixed flow of powder and granules, and a width of the passage in the flow direction connected to the introduction pipe. Is gradually expanded 1.5 to 3 times as much as the introduction pipe line, and the flow direction is curved at a substantially right angle and downward to separate the powder and granules from the gas, and the solid-gas separation is conducted to the discharge port below. Part and an exhaust part which is provided near the center of the curve of the solid-gas separation part and extracts the separated gas to the side, and if necessary, the exhaust gas from the solid-gas separation part. In the middle of the flow path to the part, while rectifying the gas extracted to the exhaust part,
A louver that eliminates the powder or granular material that flows into the exhaust unit, or a louver angle adjustment mechanism is provided.

In the separation and discharge apparatus for air transport of powder and granular material of the present invention, the mixed flow introduced to the solid-gas separation section through the introducing pipe is
As the width of the flow passage is expanded, the velocity of the gas is reduced, and the traveling direction is changed to be curved downward at a substantially right angle. Then, at the time of changing the traveling direction, the powdery particles in the mixed flow are biased toward the wall surface side in the forward direction of the solid-gas separation section by the inertial force, and are separated from the accompanying gas.
At this time, the reduction of the velocity of the gas has the effect of efficiently separating the powder and granules from the gas.

A separating and discharging device for curving the flow direction downward so as to separate powders from gas has already been disclosed in Japanese Patent Publication No. 57-2.
Although disclosed in Japanese Patent No. 6628, this separation / exhaust device does not adopt a structure in which the flow path width is gradually expanded in the solid-gas separation section. On the other hand, in the separation and discharge device for air current transportation of granular material of the present invention, the flow velocity of the gas is rapidly reduced by gradually expanding the flow passage width in the solid-gas separation portion, and the velocity difference with the solid is increased. As a result, it has the effect of promoting the separation of the powder and granules from the gas.

The separated granular material is guided downward by the speed and gravity of the transported particles and is discharged from the discharge port. At this time, the velocity of the transported granular material is converted into the downward velocity with almost no reduction, so that the discharging velocity of the granular material is kept high and the flow near the discharge port becomes smooth. No trouble such as blockage occurs.

On the other hand, the gas separated from the powdery or granular material deviates from the flow of the powdery or granular material and is withdrawn toward the center of the solid-gas separating section, and is provided near the center of the curve of the solid-gas separating section. It flows into the exhaust unit and is exhausted to the outside. At this time, if the exhausted gas contains particulate particles having a vertical terminal velocity smaller than the gas flow velocity at the exhaust part, it will flow into the exhaust part together with the gas. However, when the louver is arranged in the middle of the flow path from the solid-gas separation section to the exhaust section, the powder particles collide with the louver,
Along with this, the number of powder particles that are exhausted to the outside is reduced.

[0012] In the above-described separation and discharge device for air current transportation of powder and granules, when the louver angle adjusting mechanism is provided, the particle size constitution of the powder and granule particles accompanying the gas and flowing into the exhaust portion is controlled. be able to.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A separation and discharge device for air current transportation of powder and granules of the present invention will be described below based on an embodiment shown in FIGS.
FIG. 1 is a schematic configuration diagram of a separating and discharging apparatus for air transport of powder and granular material according to the present invention, in which (a) is a sectional front view and (b) is (a).
FIG. 2 is a plan view of the apparatus used in the experiment for confirming the effect of the separating and discharging apparatus for air transport of powder and granular material of the present invention.

In FIG. 1, reference numeral 11 is an introduction pipe line connected to an air flow transport pipe, which guides a mixed flow 12 of gas and powders sent through the air flow transport pipe to a solid-gas separation section 13. Is. As shown in FIG. 1 (b), the solid-gas separation unit 13 is
The flow passage width is gradually increased in the flow direction, and the introduction pipe line 11
The flow direction of the mixed flow 12 flowing therethrough is substantially perpendicular and curved downward, and therefore, the mixed flow 12 sent to the solid-gas separation section 13 through the introduction pipe line 11 is formed.
Will change the traveling direction downward by approximately 90 ° along the curve. And when this course is changed, mixed flow 1
Due to the inertial force, the powder particles 14 included in 2 are biased toward the front wall surface side (the left side of the paper surface in FIG. 1A) in the solid-gas separating portion 13 and are separated from the accompanying gas 15.

The separated granular material 14 flows downward in the solid-gas separation section 13 due to the speed and gravity sent in,
It is discharged from a discharge port 13a provided below the solid-gas separation unit 13. In the separation and discharge device for air current transportation of the granular material of the present invention, since the solid-gas separation section 13 has a shape in which the flow direction of the mixed flow 12 is curved at a substantially right angle and downward, The velocity of the granules 14 is converted to the downward velocity with almost no reduction. Therefore, the discharge speed of the powder or granules 14 is kept high, the flow of the powder or granules 14 in the vicinity of the discharge port 13a becomes smooth, and troubles such as the powder or granules 14 being blocked at the discharge port 13a can be prevented.

Reference numeral 16 denotes a gas 15 which is separated from the flow of the powdery or granular material 14 and is extracted toward the center of the solid-gas separation portion 13.
Is a louver arranged in the middle of a flow path from the solid-gas separation section 13 to an exhaust section 17 described later in order to extract the gas to the outside and exhaust the gas to the outside. The gas 15 extracted toward the center is the louver 16. After being rectified by the solid-gas separation unit 1
3 is guided to an exhaust unit 17 provided near the center of the curve and is exhausted to the outside.

By the way, when the gas 15 to be exhausted contains particulate particles whose vertical terminal velocity is smaller than the gas flow velocity in the exhaust unit 17, it is accompanied with the gas 15 and is exhausted. In the present invention, since the louver 16 described above is arranged, the powder particles collide with the louver 16 and the powder particles that are exhausted to the outside are reduced. You can

Generally, it is desirable that the associated outflow of powder particles to the gas side is as small as possible. Therefore, for example, if the pivot pin 16a of the louver 16 is rotated by an actuator (not shown) so that the attachment angle θ of the louver 16 can be adjusted, the exhaust portion 17 is accompanied by the gas 15.
It is possible to control the particle size configuration of the powder / granular particles guided to the above, and to reduce the accompanying outflow of the powder / granular particles to the gas side as much as possible.

In principle, the separation performance of fine particles is inferior to the conventional cyclone type separator using centrifugal force in the structure utilizing the inertial force as in the separating and discharging apparatus of the present invention. It is considered that the amount of particles flowing out with the gas increases. However, in the case of pneumatic transportation of particles, particularly in the case of high-concentration pneumatic transportation such that the solid-gas ratio (weight ratio of solid and gas) exceeds 10, the particles behave as nodules and diffusely mix with gas. Is suppressed, the diffusion rate of the fine particles into the gas is reduced, and as a result, the entrainment of the fine particles in the gas is suppressed to be low.

Next, the results of experiments conducted to confirm the effects of the present invention will be described. As shown in FIG. 2, the experiment was conducted under the conditions shown in Table 1 below, using an apparatus in which the separation and discharge device of the present invention was provided at the transport end of the air flow transport pipe 19 connecting the two gas phase tanks 18a and 18b. went. In this experiment, as for the exhaust gas of the separation / exhaust device, a blower sucked approximately the same amount as the carrier nitrogen gas amount, the bag filter 20 collected the solids accompanying the gas, and measured the solid amount. The total weight of the transported solids was also measured by the load cell 21 attached to the vapor phase tank 18b.

[0021]

[Table 1]

The solid collection rate in the case of the experiment under the above-mentioned conditions was 99.5%. For comparison, the solid collection rate was 99.6% when the cyclone-type separation / discharger shown in FIG. 4 was used instead of the separation / discharge apparatus of the present invention. From this result, it has been found that the separation and discharge device of the present invention has substantially the same performance as that of the conventional cyclone type separation and discharge device. The solid collection rate was obtained by dividing the weight of the solid flowing out with the exhaust by the weight of the transported solid.

FIG. 3 shows the result of measurement of the particle size composition of the coal flowing out along with the exhaust gas during the above experiment.
From these results, when the separation discharge device of the present invention is used (marked with ● in FIG. 3), the particle size of the solid particles flowing out to the gas side is the case when the conventional cyclone type separation discharge device is used (in FIG. 3). It was found to be equal to or smaller than that of (○).

Although a concrete angle adjusting mechanism for the louver 16 is not shown in the present embodiment, an appropriate mechanism such as a combination of a motor and a gear is adopted as long as the attachment angle of the louver 16 can be adjusted. To be done. Also,
Although this embodiment discloses that four louvers 16 are provided, the number of louvers is not particularly limited, and the size of the passage from the solid-gas separation portion 13 to the exhaust portion 17 and the louver 16 are not limited. It is determined appropriately depending on the size.

[0025]

As described above, according to the separation and discharge device for air transport of powder and granular material of the present invention, the performance equivalent to that of the conventional cyclone type separation and discharge device is simple, compact and compact. Moreover, it can be provided at low cost. in addition,
INDUSTRIAL APPLICABILITY The separation discharge device for air current transportation of powder and granules has a small pressure loss and can smoothly discharge the powder and granules.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a separation and discharge device for air transport of powder and granular material of the present invention, (a) is a front view showing a cross section, and (b) is a view of (a) as seen from a plane direction.

FIG. 2 is an overall configuration diagram of an apparatus used in an experiment for confirming the effect of the separating and discharging apparatus for air transport of powder and granular material of the present invention.

[Fig. 3] Fig. 3 is a diagram showing experimental results in the case of using the separating and discharging apparatus for air current transportation of powder and granules of the present invention and a conventional cyclone.

FIG. 4 is a schematic configuration diagram of a cyclone-type separation ejector.

[Explanation of symbols]

11 Introduction pipeline 12 mixed flow 13 Solid separation section 13a discharge part 14 Granules 15 gas 16 louvers 16a pivot pin 17 Exhaust section

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP 57-1458 (JP, A) Actual development 57-199021 (JP, U) Actual development 62-181522 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) B65G 53/00-53/28 B65G 53/32-53/66 B01D 45/00-45/18

Claims (3)

(57) [Claims] 1. An introduction pipe line for guiding a mixed flow of powdery particles and a gas, and a flow passage width which is connected to the introduction pipe line and gradually expands to 1.5 to 3 times the width of the introduction pipe line. The flow direction is curved at a substantially right angle and downward, and the solid-gas separation unit that separates the granular material from the gas and guides it to the lower outlet is provided near the center of the curve of the solid-gas separation unit. And a gas exhaust unit for laterally extracting the separated gas. 2. A louver is provided in the middle of the flow path from the solid-gas separation section to the exhaust section, for rectifying the gas extracted to the exhaust section and for eliminating the granular material flowing into the exhaust section. The separation and discharge device for air transport of powder and granules according to claim 1. 3. The separation and discharge device for air transport of powder and granular material according to claim 2, further comprising a louver angle adjusting mechanism.