JP2000346992A - Dust recovering nozzle equipped with brush-like enclosure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to suck dust on the surface with concave and convex parts where dust should be recovered by forming long-piled flexible brush on the periphery of a tip opening of the main body of a nozzle, sucking dust from a suction port made on the main body of the nozzle and allowing the brush to trace dust on the surface where it should be recovered. SOLUTION: The dust recovering nozzle 1 has a long-piled flexible brush 2 at its tip, and the brush 2 physical prevents dust with a kinetic momentum from a dust generation source from scattering. The nozzle 1 transports and recovers the dust together with the sucked air. The dust recovering nozzle 1 whose size covers the range on a recovery objective surface 5 where gas is generated is formed to recover the dust, which is cooled through the mixture with a sucked air, and radioactive substances in the form of aerosol are captured by a high-performance filter placed in a dust collector. In this case, even if the distance between the recovery objective surface 5 and the dust recovering nozzle 1 fluctuates more or less, the length and flexibility of piles of the brush 2 prevents a space where dust scatters from being formed, which makes it possible, to recover the dust stably. Since the high accuracy of the distance between the recovery objective surface 5 and the dust recovering nozzle 1 is unnecessary, consequently, it is convenient for the automation of work.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, vitrification of a surface layer of an inorganic substance such as concrete contaminated by penetration of a radioactive substance using a laser or the like in a nuclear facility or a facility handling radioactive substances. In the case of decontamination by peeling or explosive peeling, or in the case of working using a rotary grinding tool, the dust that comes out with a momentum is collected without scattering.

[0002]

2. Description of the Related Art In the prior art, it is conceivable to collect a dust by installing a cylindrical suction nozzle near a dust generation site.

[0003]

However, in the above-mentioned conventional dust collecting apparatus in the above operation, in the decontamination using a laser or the like, for example, in addition to vaporized radioactive substances, a large amount of dust having momentum is scattered and radioactive substances are scattered. There were inconveniences in handling the material. In addition, in the case of a suction-type grinding tool with a cover to prevent scattering of dust, although there are some measures such as using an elastic material for a part of the cover in order to eliminate the gap between the cover and the surface to be treated, , Its coverage is narrow,
Fine adjustment by hand was necessary.

[0004] It is an object of the present invention to provide an apparatus for easily collecting dust having high momentum, including vaporized radioactive substances, with high collection efficiency.

[0005]

According to the present invention, there is provided a nozzle body having an open end, a brush having a long bristle formed around an opening at the end of the nozzle body, and a nozzle provided on the nozzle body. A suction port, suction is performed from the suction port, and even if the collection target surface has irregularities due to the brush following the collection target surface, or even if the distance between the collection target surface and the nozzle slightly fluctuates, It is characterized in that it is possible to collect dust generated from the, dust collection nozzle, or, in the dust collection nozzle, equipped with a laser head on the nozzle body, and irradiates light energy from the laser head to the surface to be collected The dust collection nozzle, or the dust collection nozzle, wherein the brush covers the area of the collection target surface where dust is generated, and performs decontamination work while moving the light energy irradiation site in the dust collection nozzle. In the dust collecting nozzle, or in the dust collecting nozzle, the brush has an obliquely cut shape in consideration of the surface temperature distribution of the surface layer to be decontaminated in consideration of the surface distribution of the surface to be decontaminated. The dust collection nozzle is characterized in that light energy can be irradiated obliquely to the surface to be decontaminated.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the dust collecting nozzle of the present invention will be described below with reference to the drawings.

<A> Dust Collection Nozzle The dust collection nozzle of the present invention has a flexible brush-like enclosure with a long hair at the tip. As a result, in FIG. 1, scattering of dust having a momentum generated from the dust source (here, dust generated by laser irradiation) is performed by the brush 2.
And physically transported with suction air to collect. The dust in the present invention includes gas (gas) generated from the recovery target surface 5.

In FIG. 1, a dust collecting nozzle having a size covering a range in which a gas (here, a radioactive substance vaporized due to a rise in surface temperature of the surface to be recovered due to laser light energy) is generated on the surface 5 to be recovered. As a result, these are collected, and the radioactive material that has been cooled by mixing with the suction air and has become an aerosol is captured by a high-performance filter installed in a dust collector (not shown here).

For example, Cs is used as a radioactive substance, laser output: 300 to 2000 (W), beam diameter;
6 to 30 (mm), scanning speed; 30 to 300 (mm / m
In), when the surface of the concrete is treated at about in), the range in which the surface layer is equal to or higher than the boiling point of Cs (963K) is at most 20 to 3 behind the movement around the laser irradiation site.
It becomes about 0 (mm). Therefore, a diameter of 100 (m
With a nozzle diameter of about m), vaporized Cs can also be recovered.

In FIG. 1, even if the distance between the surface to be collected and the dust collecting nozzle fluctuates slightly, the length and flexibility of the brush 2 make it possible to stably collect the dust without creating a gap where the dust is scattered. It is possible. Therefore, there is no need to set the distance between the collection target surface and the dust collection nozzle with high accuracy, which is convenient for performing important automation in the operation of handling radioactive materials.

<B> Nozzle Body The nozzle body 1 of the dust collecting nozzle has an opening at its tip for collecting dust (including gas) generated from the collection target surface 5. A flexible brush 2 having a long bristle is attached around the opening. The degree of flexibility with long hair is
Dispersion of relatively large dust having a momentum can also be physically prevented, and even if the collection target surface 5 has irregularities due to the brush 2 following the collection target surface 5 (flat surface), the collection target surface 5 and the nozzle Even if the distance of 2 slightly fluctuates, no gap is created in which dust is scattered. As a result, since air is sucked on average because no air gap is formed, turbulence is reduced, and stable dust collection is possible.

The nozzle body 1 is provided with a suction port 3 for sucking gas. For example, a suction hose is connected to the suction port 3, and a gas such as air can be sucked by a suction pump.

The nozzle body 1 has a laser head 4 for irradiating light energy. In a nuclear facility or a facility handling radioactive materials, the surface to be recovered 5, for example, the surface of an inorganic material such as concrete contaminated by the penetration of radioactive materials, is irradiated with light energy to remove the surface by vitrification or explosion. Dye. At that time, the dust contaminated with the radioactive substance that jumps out with momentum is collected without scattering, and the radioactive substance vaporized by the laser beam is also collected. Therefore, the dust collection nozzle covers a range in which the surface temperature of the surface layer to be decontaminated is equal to or higher than the boiling point of the radioactive substance.

<C> Vitrification exfoliation Vitrification exfoliation is a method of irradiating the surface of an inorganic substance such as concrete contaminated by the penetration of radioactive substances and harmful substances with light energy to vitrify and decontaminate the substance.

As light energy, for example, a CO ₂ laser, a CO laser, or a Nd: YAG laser is used, and irradiation is performed while scanning such light energy. Then, the contaminated layer is melted by the light energy. Thereafter, by natural cooling, the molten layer solidifies while containing contaminants and vitrifies. The solidified glass layer has reduced adhesion at the interface with the substrate due to volume shrinkage due to cooling.

[0016] Therefore, it is easily separated from the substrate by a brush or suction. Therefore, subsequent exclusion and collection can be easily performed by suction.

When fumes are generated by scanning irradiation of light energy, suction and discharge are performed by a dust collecting nozzle.
Alternatively, suction and recovery are performed.

<D> Explosion Explosion Explosion crushing can be caused in the contaminated layer by changing irradiation conditions such as irradiation power, defocus distance and scanning speed in the case of vitrification.

Explosion means that when light energy is applied to a contaminated surface layer, the surface layer is rapidly heated and the moisture contained in the concrete evaporates instantaneously. As a result, explosive crushing occurs, and the contaminated layer becomes small pieces and peels off.

The explosion layer is peeled off and collected. Since the crushed pieces are small pieces containing contaminants, the small pieces are trapped and sucked and collected by a dust collection nozzle.

<E> Other Dust Collection Nozzles FIG. 1 shows a circular dust collection nozzle centered on a dust source, but FIG. 2 shows a case where decontamination work is performed while moving a laser irradiation site. Considering the surface temperature distribution of the decontamination target resulting from
This is a dust collection nozzle having a bulging shape at the rear of the movement. The distance between the laser irradiation site and the front brush can be reduced, so that the nozzle is good in leaning to a corner or the like.

FIGS. 3 and 4 show an example of a dust collecting nozzle having a brush shape that is cut obliquely in order to ensure the processing of the corners.

[0023]

The dust collecting nozzle provided with the brush-like enclosure according to the present invention is as described above, so that the following effects can be obtained. <B> By providing the brush-like enclosure, scattering of relatively large dust having momentum can be physically prevented. <B> Equipped with a long, bristle-shaped, flexible brush-like enclosure, creates a gap where dust can be scattered even if the surface to be collected has irregularities and the distance between the surface to be collected and the nozzle slightly fluctuates. Absent. <C> Even if the distance between the surface to be collected and the nozzle slightly fluctuates, there is no space for dust to be scattered, so that stable dust collection is possible. <D> Even if the distance between the surface to be collected and the nozzle fluctuates somewhat, stable dust collection is possible, and automation is easy. <E> By knowing the temperature distribution of the surface to be recovered and the boiling point of the radioactive material, it is possible to recover the vaporized radioactive material and the like. <F> Use of a brush cut at an angle enables use at a corner of a room.

[Brief description of the drawings]

FIG. 1 is a schematic side cross-sectional view showing one embodiment of the present invention and at the time of decontamination using a laser.

FIG. 2 is a plan view of a dust collection nozzle having a shape that is swollen behind the movement in consideration of a surface temperature distribution of a decontamination target generated by performing a decontamination operation while moving a laser irradiation site.

FIG. 3 is a schematic side view of a dust collection nozzle having an obliquely cut brush shape in consideration of performing laser irradiation obliquely to a surface to be decontaminated when decontaminating a corner. is there.

FIG. 4 is a schematic side view of a dirt-removing brush-shaped dust collecting nozzle in consideration of performing laser irradiation obliquely to a surface to be decontaminated when decontaminating a corner. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Dust collection nozzle main body 2 ... Brush 3 ... Suction port 4 ... Laser head 5 ... Collection target surface

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[Procedure amendment]

[Submission date] February 3, 2000 (200.2.3)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

[0005]

According to the present invention, there is provided a nozzle body having an open end, a brush having a long bristle formed around an opening at the end of the nozzle body, and a nozzle provided on the nozzle body. With a suction port, even if the recovery target surface has irregularities, and even if the distance between the recovery target surface and the nozzle fluctuates slightly,
The brush follows the surface to be collected and sucks air from the suction port
Radioactive material with momentum generated from the surface to be collected
Of dust with a brush, and suction dust with suction air
A dust collection nozzle, or a dust collection nozzle, wherein the nozzle body is provided with a laser head, and the laser head irradiates light energy to the collection target surface from the laser head to generate dust. The brush is covering the range of the surface, the dust collection nozzle, or, in the dust collection nozzle, when performing the decontamination work while moving the light energy irradiation site, the decontamination target surface temperature distribution Considering, characterized in that the rear of the movement is swelled, dust collection nozzle, or, in the dust collection nozzle, the brush has a diagonally cut shape, with respect to the surface to be decontaminated The dust collecting nozzle is characterized by being capable of irradiating light energy obliquely.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shogo Okane No. 2-4 Shirane, Shirakata, Tokai-mura, Naka-gun, Ibaraki Pref. Japan Atomic Energy Research Institute (72) Inventor Hideto Ekimichi Shirakata, Tokai-mura, Naka-gun, Ibaraki 2-4 Shirane Inside Japan Atomic Energy Research Institute (72) Hirofumi Kamata 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. (72) Inventor Wignaraja Shibakumaran Nishishinjuku-ichi, Shinjuku-ku, Tokyo 25-25-1, Taisei Construction Co., Ltd. (72) Inventor Shunji Sato 1-2-1, Wadazakicho, Hyogo-ku, Hyogo-ku, Hyogo Prefecture Inside Mitsubishi Electric Corporation (72) Inventor Tatsuya Koga Hyogo-ku, Kobe-shi, Hyogo 1-2-1, Wadazakicho Mitsubishi Electric Corporation (72) Inventor Tomoyuki Yamamoto 2-2-1 Minatomirai Nishi-ku, Yokohama-shi, Kanagawa Prefecture Shinryo Corporation (72) Inventor Tetsuya Fujita 2-2-1 Minato Mirai, Nishi-ku, Yokohama-shi, Kanagawa Prefecture Shinryo Corporation

Claims (4)

[Claims] 1. A nozzle body having an open end, a flexible brush having a long hair formed around an opening at the end of the nozzle body, and a suction port provided in the nozzle body. It is possible to collect dust generated from the collection target surface even if the collection target surface has irregularities due to the brush following the collection target surface and the distance between the collection target surface and the nozzle slightly fluctuates. A dust collection nozzle, characterized in that: 2. The dust collecting nozzle according to claim 1, further comprising a laser head provided on the nozzle body, and irradiating light energy from the laser head to a surface to be collected.
A dust collection nozzle, wherein a brush covers an area of a collection target surface where dust is generated. 3. The dust collecting nozzle according to claim 2, wherein when the decontamination work is performed while moving the light energy irradiation part, the rear surface of the movement is expanded in consideration of the surface temperature distribution of the decontamination target. A dust collection nozzle, characterized in that: 4. The dust collecting nozzle according to claim 1, wherein the brush has an obliquely cut shape, and can irradiate light energy obliquely to a surface to be decontaminated. Dust collection nozzle.