JPH0691119A - Dust collecting hood - Google Patents

Abstract

PURPOSE:To collect a relatively coarse grain which is transferred to a conveyor on the downstream side by arranging a collecting member blocking a dust current sucked in the direction of a dust collecting duct to stagnate the current in a dust collecting hood covering a dusty place. CONSTITUTION:A dust collecting hood 1 is set at a extremely dusty place like a place where a granular body-contg. material is transferred. A dust current (a) sucked into the hood 1 covering the dusty place in the direction of the dust collecting duct 2 is blocked and stagnated. An appropriate number of collecting members 7 with the lower surface recessed are arranged and sloped downward toward the place where the flow velocity of the sucked dust is low. The dust grains (b) having 0.1-0.5mm diameter are collected and returned. Consequently, the relatively coarse grains having 0.1-0.5mm diameter in the dust sucked by the dust collecting duct are collected and transferred to a belt conveyor 3b on the downstream side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust collecting hood installed at a connecting portion of a belt conveyor, for example.

[0002]

2. Description of the Related Art Dust collecting hoods, dust collecting ducts, dust collectors, exhaust fans, etc. in dust-generating parts such as transit parts of belt conveyors and vibrating screens or in places where highly abrasive dust is generated in a sintering plant of a steel mill. The inside is abraded by the collision when the collected dust passes.

In this case, in order to prevent dust from the dust collecting portion as much as possible, the dust collecting equipment is designed with a margin for the required air volume, and the dust collecting hood is Since the flow velocity distribution is biased, generally even dust of a size that does not float is sucked into the dust collection duct. One of the causes of wear inside the dust collecting equipment is the collision of the above-mentioned dust having a large particle size.

For example, in a transfer section of a belt conveyor in a sintering facility, as shown in FIG. 1, the transfer section, which is a dust generating section, is surrounded by a dust collecting hood 1 such as an iron plate, and a dust collecting duct 2 is provided above it. In addition to connecting, the dust collecting hood 1 is connected to the cover 4a of the upstream belt conveyor 3a, and the downstream belt conveyor 3b is connected to the lower part of the dust collecting hood 1 via a chute 5 and a skirt board 6. With the structure connected to the cover 4b of the downstream belt conveyor 3b,
The cover 4a and the dust-collecting hood 1 are connected to each other, the chute 5 and the skirt board 6 are connected to each other, and the upstream belt conveyor 3a is inserted into the chute 5 in the vicinity of C and D. Outside air is collected from these openings. It flows into the dust hood 1.

Further, in the above-mentioned conventional connecting portion, there is no straightening vane inside the dust collecting hood 1, so that the flow velocity is high near the front of the dust collecting duct 2, while the dust collecting hood 1
Since the flow velocity is slow near the wall surface, it becomes a stagnation part.

[0006]

That is, in the connecting portion of the belt conveyor having the above-mentioned structure, when the sinter ore, which is a conveyed product, is introduced into the chute from the upstream belt conveyor, the sinter particles are The air held inside and the air around the sinter will be replenished into the dust collection hood at the same time as the sinter. The air replenished in the dust collecting hood is sucked toward the dust collecting duct at a flow velocity of about 1 m / sec in the vicinity of the front side, which is opposite to the falling direction, so that the particle size of the air is increased along with the air flow. In addition to dust of 0.1 mm or less, relatively fine particles in sintered ore particles having a diameter of 0.1 to 0.5 mm (relatively coarse particles in dust collected)
Even the particles will be sucked in the direction of the dust collecting duct, and the weight ratio of the sucked particles is about 50%.
Particles of about 1 to 0.5 mm wear the inside of the dust collecting equipment.

The present invention has been made in view of the above problems in the conventional dust collecting hood, and has a relatively coarse particle diameter of 0.1 to 0.5 mm in the dust sucked in the dust collecting duct.
It is an object of the present invention to provide a dust collection hood capable of collecting the particles of and collecting the particles and transferring them to the downstream belt conveyor again.

[0008]

In order to achieve the above-mentioned object, a dust collecting hood of the present invention is a dust collecting hood installed at a place where dust generation is remarkable, such as a transfer place of a granular material-containing conveyed product. A hood having a dented lower surface that interferes with a dust flow sucked in the direction of the dust collection duct installed above the dust collection hood that covers the dust-generating portion and stagnates the dust flow. Are arranged in an appropriate number, and the collecting member is a long member and is installed so as to have a downward slope toward the transfer destination.

[0009]

In the dust collecting hood of the present invention, when a conveyed product is loaded into the chute from the transfer source, dust containing a particle size of 0.1 to 0.5 mm is sucked in the direction of the dust collecting duct. As shown in FIG. 2, the flow collides with the collecting member 7 installed in the dust collecting hood and stagnates in the recessed portion 7a on the lower surface thereof. Then, due to this stagnation, the dust particles b having a relative velocity difference with the dust flow a and having a particle size of 0.1 to 0.5 mm are
When the collecting member 7 is a long material and has a downward slope toward a portion with a slow suction dust flow velocity, it is separated toward the slow portion by inertial separation due to the difference in specific gravity. It moves and falls downward when the gravity settling velocity becomes higher.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the accompanying drawings. FIG. 1 is an overall schematic view showing an embodiment of the present invention, FIG. 2 is an explanatory view of stagnation of a dust flow in a collecting member, and FIG. 3 is a drawing showing an example of arrangement of the collecting members.

In FIG. 1, reference numeral 7 denotes a long collecting member arranged in the dust collecting hood 1 so as to obstruct the suction dust flow a rising therein. For example, as shown in FIG. A dented bottom surface such as a chevron cross section is used. Then, as shown in FIG. 3, a large number of the collecting members 7 are arranged in a staggered manner in the dust collecting hood 1, and the inside of the dust collecting hood 1 is sucked toward the dust collecting duct 2 above the dust collecting hood 1. The dust flow a surely collides with the lower surfaces of the collecting members 7.

As shown in FIG. 2, the dust flow a colliding with the hollow portion 7a on the lower surface of the collecting member 7 is settled in the hollow portion 7a, and has a relative velocity difference with the dust flow a, for example, a particle size of 0. The dust particles b of 1 to 0.5 mm are inertially separated due to the difference in specific gravity between them. If the dust particles b that have been inertially separated are installed in the collecting member 7 so as to have a downward slope toward the point where the suction dust flow velocity is the slowest, that is, toward the wall surface of the dust collecting hood 1, It moves along the gradient, drops downward when the gravity settling velocity becomes higher than the suction velocity, and is transferred onto the downstream belt conveyor. In FIG. 1, 8 is a dust collector, 9 is an exhaust fan, and 10 is a chimney.

[0013]

As described above, the present invention has the above-described structure, and the weight of dust per unit of collected gas was 24.5 g / Nm ³ when the conventional dust collection hood was used. By applying a dust hood, 9.8g / Nm ³
Decreased to. This means that the object of the present invention, which is to collect dust particles having a particle diameter of 0.1 to 0.5 mm, can be sufficiently achieved, and wear of dust collecting equipment such as a dust collecting duct and a dust collecting machine can be achieved. It can greatly contribute to the reduction of the amount.

In the present invention, the collecting member is installed in the dust collecting hood. Since the increase in pressure loss in the dust collecting hood due to this is 1 mmAq or less, the influence of the decrease in the dust collecting air volume is almost zero. Absent. Therefore, it is possible to reduce the dust concentration in the dust collecting gas without reducing the dust collection air volume and increasing the pressure loss. Further, in a line that conveys a conveyed product as a product from a sintering plant or the like to the next step, a relatively coarse dust is intensively sucked at a final connecting portion from the plant, so that abrasion of the dust collecting duct over a wide range is reduced. It is possible to concentrate on the location and facilitate repair work.

[Brief description of drawings]

FIG. 1 is an overall schematic view showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram of stagnation of a dust flow in a collection member.

FIG. 3 is a drawing showing an example of an arrangement example of a collecting member.

[Explanation of symbols]

 1 Dust collecting hood 3a Upstream belt conveyor 3b Downstream belt conveyor 7 Collection member

Claims (2)

[Claims] 1. A dust collection hood that is installed at a location where dust generation is significant, such as a location where a powdery or granular material-containing conveyed material is transferred, and is installed above the dust collection hood that covers the dust generation location. A dust collecting hood, characterized by arranging an appropriate number of collecting members having a recessed bottom surface that obstructs the dust flow sucked in the direction of the dust collecting duct and stagnates the dust flow. 2. The dust collecting hood according to claim 1, wherein the collecting member is long and is installed so as to have a downward slope toward a location where the suction dust flow velocity is slow.