JP2014176957A - Device for dry ice blasting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dry ice blasting device capable of preventing sublimation of a dry ice pellet in a hose during pressure-feeding.SOLUTION: A dry ice blasting device 1 is provided with a dry ice blasting machine 2, a compressor 3, an air dryer 4, a liquefied gas evaporator 6a, a liquefied nitrogen cylinder 6b, a transport hose 7, a spray nozzle 8 and remote-controlled heavy equipment 9. The transport hose 7 has flexibility, is covered by a heat insulating material and has two or more combined hose members 17a, 17b having the inner diameters different from each other. The inner diameter of the hose member 17a disposed at the side of the spray nozzle 8 is larger than that of the hose member 17b disposed at the side of the blasting machine 2.

Description

  The present invention relates to a cleaning device (dry ice blasting device) using dry ice.

In many cases, a decontamination technique using dry ice (hereinafter referred to as dry ice blasting) is used as a decontamination method for radioactive substances attached to roads, equipment and the like.
Dry ice blasting sprays fine particles of dry ice (dried ice pellets) onto the deposit with compressed air, drastically lowers the surface temperature of the deposit, and causes the dry ice pellet to enter the gap between the deposits. This is a cleaning technique that causes volume expansion and peels off deposits.

  For road decontamination, it is common for an operator to install a set of dry ice blasting equipment adjacent to the object to be decontaminated and then work with a cleaning nozzle at the tip of the hose (for example, a patent) Reference 1).

As a method for decontamination of radioactive waste at nuclear facilities, etc., a set of dry ice blasting equipment is installed in one room (operation room) isolated by a shielding wall, and the other room on the opposite side of the shielding wall. For example, a dismantled object or a laboratory instrument is placed and the cleaning nozzle is operated using a handle or the like from the operation room side (for example, see Patent Document 2).
In such a conventional dry ice blasting, the radioactive waste and the dry ice blasting device are arranged adjacent to each other with the shielding wall interposed therebetween, so that the dry ice transport hose can be applied even at about 30 m.

JP 2008-68341 A Japanese Patent No. 2991974

When decontaminating floors and walls inside buildings that have been contaminated with radioactivity, or equipment installed inside buildings, workers may not be able to work inside the buildings for health management purposes. In addition, the method of operating the cleaning nozzle handle also has a narrow cleaning range and cannot perform efficient work.
Therefore, when implementing a decontamination method using dry ice inside a building, it is necessary to remotely operate and move a remotely controlled heavy machine equipped with a cleaning nozzle. It is necessary to increase the distance of the dry ice transport hose.

  However, if the transport distance (hose length) of dry ice pellets (dry ice fine particles) is long, sublimation (solid turns directly into a gas without passing through a liquid) before the dry ice pellets reach the cleaning nozzle. There is a risk of Thus, if the dry ice pellets sublime before reaching the cleaning nozzle, the dry ice pellets cannot be sufficiently ejected.

Further, in order to dispose the dry ice blasting apparatus outdoors and to decontaminate the inside of the building, it is necessary to provide a mechanism for suppressing sublimation of the dry ice pellets.
The reason for this is that the temperature of compressed air used for spraying (spraying) dry ice pellets is generally room temperature or higher (20 ° C. or higher), which is much higher than the dry ice sublimation temperature (boiling point: −78.5 ° C.). This is because sublimation of dry ice pellets starts immediately after mixing with compressed air.

  An object of the present invention is to solve the above-mentioned problems, and it is an object to propose a dry ice blasting apparatus capable of suppressing sublimation in a hose of dry ice pellets being pumped. And

  In order to solve the above problems, a dry ice blasting apparatus according to the present invention includes a dry ice blasting machine that supplies dry ice pellets, a compressor that supplies compressed air to the dry ice blasting machine, and the dry ice blasting machine. A transport hose for transporting the supplied dry ice pellets to an object to be cleaned, an injection nozzle attached to a tip of the transport hose for injecting the dry ice pellets, and a remote control heavy machine for gripping the injection nozzle A dry ice blasting apparatus comprising: the transport hose covered with a heat insulating material.

According to such a dry ice blasting apparatus, even if the transport hose is long, sublimation of the dry ice pellets can be suppressed.
Since the transport hose is covered with a heat insulating material, the heat retaining effect in the hose is enhanced, the inside of the hose is prevented from being warmed by the outside air, and the sublimation of the dry ice pellets can be delayed.

If the dry ice blasting device is provided with an air cooling means for cooling the compressed air by arranging at least one of a gas cooling device and an antifreeze liquid cooling device between the dry ice blasting machine and the compressor, Since the compressed air is cooled by the air cooling means, the start of sublimation of the dry ice pellets can be further delayed.
The gas cooling device includes a liquefied nitrogen cylinder that supplies liquefied nitrogen for cooling the compressed air, and a liquefied gas evaporator that is disposed between the dry ice blasting machine and the liquefied nitrogen cylinder to vaporize the liquefied nitrogen. Or a liquefied carbon cylinder for supplying liquefied carbon dioxide for cooling the compressed air, and disposed between the dry ice blasting machine and the liquefied carbon dioxide cylinder to vaporize the liquefied carbon dioxide. What is necessary is just to be comprised including a liquefied carbon dioxide generator.
In the antifreeze liquid cooling device, it is preferable that a tank and a pump are integrated and the compressed air is cooled by circulating the antifreeze liquid.

It is desirable that the liquefied carbon dioxide cylinder has an open / close mechanism that adjusts the supply amount of the liquefied carbon dioxide so that the temperature of the dry ice pellet falls within a control value.
The transport hose is preferably composed of a silicon rubber inner tube and a double structure covering the inner tube with a stainless steel mesh.

  Further, the transport hose of the dry ice blasting device is formed by connecting at least two or more hose members having different inner diameters, and the inner diameter of the hose member disposed on the injection nozzle side is the dry ice blasting machine side. If it is larger than the inner diameter of the hose member disposed on the surface, the sublimation of the dry ice pellets can be more effectively suppressed.

The transportation hose is changed from a small-diameter hose member to a large-diameter hose member and provided with an expansion valve mechanism, whereby the compressed air is rapidly depressurized and the compressed air is adiabatically expanded. The adiabatic expansion referred to here is a physical phenomenon in which the heat energy is consumed and the temperature is lowered when the volume of the refrigerant gas increases due to the expansion of the hose volume.
Therefore, by increasing the diameter of the hose, the temperature in the transportation hose decreases, and sublimation of the dry ice pellets can be suppressed.

  The remote control heavy machine is disposed indoors, and is connected to the suction nozzle via a cover that covers the periphery of the injection nozzle, a suction nozzle for sucking air in the cover, and a suction hose. If it further comprises an indoor dust collector, a dust collecting duct extending from the room to the outdoor, and an outdoor dust collector connected to the outdoor end of the dust collecting duct, the dry ice blasting device is loaded. It can be effectively used for decontamination work in buildings where pressure management is possible, and it is possible to prevent the removed contaminants from being scattered.

  According to the dry ice blasting apparatus of the present invention, it is possible to suppress sublimation in the hose of dry ice pellets being pumped. Therefore, radioactive contamination can be decontaminated safely and at low cost by remote control, and the decontamination work period can be shortened and the decontamination cost can be reduced.

It is a schematic diagram which shows the dry ice blasting apparatus which concerns on 1st embodiment. It is an expanded sectional view which shows a part of transport hose of the dry ice blasting apparatus shown in FIG. It is a schematic diagram which shows the dry ice blasting apparatus which concerns on 2nd embodiment. It is a schematic diagram which shows the other form of a dry ice blasting apparatus.

<First embodiment>
In the first embodiment, a case where decontamination in a building B is performed using the dry ice blasting apparatus 1 will be described.
Dry ice blasting device 1, as shown in FIG. 1, and performs decontamination of such radioactive substances adhering to the inner wall surface W _S of the room that forms part of a building B (cleaned object). In this specification, the inside of a room to be decontaminated is called “indoor I”, and the outside of the room is called “outdoor O”. The room to be cleaned is a sealed space surrounded by walls W, a ceiling, and a floor.

Dry ice blasting device 1, to the wall surface W _{S (cleaned} object), by injecting the dry ice pellet is peeled contaminants adhering to the wall surface W _S (radioactive substances).
In this embodiment, dry ice pellets having a particle size of about 3 mm are used, but the particle size of the dry ice pellets is not limited.

  As shown in FIG. 1, such a dry ice blasting apparatus 1 includes a dry ice blasting machine 2, a compressor 3, an air dryer 4, and air cooling means 5 (a liquefied gas evaporator 6a and a liquefied nitrogen cylinder 6b). , Transport hose 7, injection nozzle 8, remote control heavy machine 9, nozzle cover 10, suction nozzle (not shown), indoor dust collectors 11 and 16, dust collection duct 12, and outdoor dust collector 13. And.

The dry ice blasting machine 2 stores dry ice pellets and supplies the dry ice pellets to the room I. The supply amount of the dry ice pellets is not limited, but is 1.0 kg / min to 1.5 kg / min in the present embodiment.
The dry ice blasting machine 2 is disposed outside the outdoor O and is connected to a transport hose 7 extending from the outdoor O to the indoor I. In the present embodiment, the dry ice blasting machine 2 is disposed inside the working chamber A provided in the outdoor O, but the dry ice blasting machine 2 is not necessarily provided in the working chamber A. The working chamber A is a sealed space.

The dry ice blasting machine 2 discharges dry ice pellets using the compressed air supplied from the compressor 3. In the present embodiment, the capacity of the compressor 3 is set to a motor output of 7.5 kw or more, an air flow rate of 1.0 m ³ / min or more, and a discharge pressure of 0.4 Mpa or more, but the capacity of the compressor 3 is not limited.
The dry ice pellets discharged from the dry ice blasting machine 2 are transported into the room I via the transport hose 7.

The dry ice blasting machine 2 is of a power type and is driven by electric power supplied from the generator 14.
In addition, although the generator 14 is arrange | positioned adjacent to the compressor 3 in the outdoor O, the installation location of the generator 14 is not limited.

The compressor 3 supplies compressed air to the dry ice blast machine 2.
The compressor 3 is disposed outside the room O and is connected to the dry ice blasting machine 2 via an air pipe 15.

  The air pipe 15 is connected to the dry ice blast machine 2 from the compressor 3 via the air dryer 4 and the air cooling means 5. Although the material which comprises the air pipe | tube 15 is not limited, In this embodiment, it is comprised with the pipe material which has flexibility. Further, at least between the air cooling means 5 and the dry ice blasting machine 2, it is desirable that the periphery of the air pipe 15 is covered with a heat insulating material.

  The compressor 3 according to the present embodiment is an electric power type and is driven by electric power supplied from the generator 14. The drive format of the compressor 3 is not limited.

  The compressed air supplied from the compressor 3 is supplied to the dry ice blast machine 2 through the air dryer 4 and the air cooling means 5.

The air dryer 4 reduces the humidity of the compressed air discharged from the compressor 3.
The air dryer 4 is disposed between the dry ice blast machine 2 and the compressor 3 in the outdoor O. Note that the air dryer 4 may be disposed as necessary and may be omitted (see FIG. 4).

  The air cooling means 5 of this embodiment is a gas cooling device provided with the liquefied gas evaporator 6a and the liquefied nitrogen cylinder 6b, as shown in FIG.

The liquefied gas evaporator 6a cools the compressed air. The outlet temperature of the liquefied gas evaporator 6a is managed in the range of 0 ° C to -40 ° C.
The liquefied gas evaporator 6 a is disposed between the dry ice blast machine 2 and the air dryer 4, and cools the compressed air whose humidity has been lowered by the air dryer 4.

The liquefied gas evaporator 6a is connected to the liquefied nitrogen cylinder 6b, and vaporizes the liquefied nitrogen supplied from the liquefied nitrogen cylinder 6b.
Although the liquefied gas evaporator 6a of this embodiment is arrange | positioned inside the working chamber A, the installation location of the liquefied gas evaporator 6a is not limited.

The compressed air supplied from the compressor 3 passes through the liquefied gas evaporator 6a, thereby contacting the liquefied nitrogen inside the liquefied gas evaporator 6a. When the liquefied nitrogen and the compressed air come into contact with each other, the liquefied nitrogen is vaporized and the compressed air is cooled.
Therefore, the compressed air supplied to the liquefied gas evaporator 6a is supplied to the dry ice blast machine 2 in a cooled state.

The liquefied nitrogen cylinder 6b stores liquefied nitrogen for cooling the compressed air.
The liquefied nitrogen cylinder 6b is disposed outside the outdoor O and is connected to the liquefied gas evaporator 6a. Although the liquefied nitrogen cylinder 6b of this embodiment is disposed outside the work chamber A, the liquefied nitrogen cylinder 6b may be disposed inside the work chamber A.

The transport hose 7 pumps the dry ice pellets discharged from the dry ice blasting machine 2 to the object to be cleaned.
The transport hose 7 passes through a wall W provided at the boundary between the room I and the room O. The length of the transport hose 7 is not limited, but is 30 to 100 m in the present embodiment.
The transport hose 7 has an inner diameter of 15A (1/2 inch), 20A (3/4 inch), 25A (1 inch), or the like.

  An injection nozzle 8 is attached to the distal end (inner side end portion) of the transport hose 7, and the proximal end (outdoor end portion) of the transport hose 7 is connected to the dry ice blast machine 2.

  As shown in FIG. 2, the transport hose 7 of this embodiment includes a hose member 17 (first hose member 17a) disposed on the injection nozzle 8 side (tip side) and a dry ice blasting machine 2 side (base). The hose member 17 (second hose member 17b) disposed on the end side is connected through an attachment jig 17c. The number of hose members 17 forming the transport hose 7 is not limited as long as it is two or more.

The hose member 17 is made of a flexible resin tube material and is covered with a flexible resin heat insulating material 7a.
In this embodiment, a heat insulating hose covered with foamed polyethylene (heat insulating material 7a) is used for the air tube 15 and the transport hose 7. The materials of the air tube 15, the transport hose 7 and the heat insulating material 7a are not limited.

  The inner diameter of the first hose member 17a is larger than the inner diameter of the second hose member 17b. That is, the transport hose 7 has an enlarged inner diameter at the joint between the first hose member 17a and the second hose member 17b.

  In the present embodiment, the case where the transport hose 7 is formed by connecting two hose members 17a and 17b having different inner diameters has been described. However, the transport hose can be formed by connecting three or more hose members 17. 7, it is only necessary to provide a portion where the inner diameter is increased at the joint portion between at least one hose member 17, and the inner diameters of all the hose members 17 are not necessarily different.

As shown in FIG. 1, the injection nozzle 8 is attached to the tip of the transport hose 7. Dry ice pellets and compressed air, which have been transported through the transport hose 7 is injected to the inner wall surface W _S from the injection nozzle 8.

In the present embodiment, the injection nozzle 8 is held by the remote control heavy machine 9.
The injection nozzle 8 penetrates the nozzle cover 10 and injects dry ice pellets and compressed air inside the nozzle cover 10.

The remote control heavy machine 9 is a construction machine that can be operated remotely, and is disposed in the room I.
In the present embodiment, two remotely controlled heavy machines 9 are disposed in the room I.
The dry ice blasting apparatus 1 according to the present embodiment is configured so that the work in the room I can be performed unattended by using the remote control heavy machine 9.

At least one of the two remote control heavy machines 9 has an arm 9a that can be rotated up and down and left and right.
One remote control heavy machine 9 holds the injection nozzle 8 at the tip of the arm 9a.

Further, one remote control heavy machine 9 has a first indoor dust collector 11 mounted thereon, and the other remote control heavy machine 9 has a second indoor dust collector 16 mounted thereon.
The number of remotely controlled heavy equipment 9 is not limited, and for example, only one remote heavy equipment 9 (one) that holds the injection nozzle 8 may be provided.

The nozzle cover 10 covers the discharge port of the spray nozzle 8.
Nozzle cover 10 is formed so as to diameter (widening) toward the wall surface W _S side, consisting of frustoconical tubular member.

Nozzle cover 10, by adhering the wall surface distal to the inner wall surface W _S, the wall surface W _{S (cleaned} object) peeled removed material from the dry ice pellets or dry ice pellets injected from the injection nozzle 8 (radioactive To prevent the material) from diffusing.

  A suction nozzle (not shown) is attached to the nozzle cover 10. The suction nozzle serves as a suction port for gas and dust in the nozzle cover 10.

  The suction port (tip) of the suction nozzle is disposed in the nozzle cover 10. The proximal end of the suction nozzle is connected to the first indoor dust collector 11 via a suction hose.

The first indoor-side dust collector 11 sucks the air and dust in the nozzle cover 10 through the suction nozzle and the suction hose 18, to recover the matter removed from the wall surface W _S.
The first indoor dust collector 11 is disposed indoors.

On the other hand, the second indoor dust collector 16 sucks dust and the like scattered in the room I.
In addition, what is necessary is just to arrange | position the 2nd indoor side dust collector 16 as needed.

The dust collection duct 12 passes through a wall W formed at the boundary between the room I and the room O.
The tip (inner side end) of the dust collection duct 12 is open in the room I, and the base end (outdoor end) of the dust collection duct 12 is a chamber (not shown) provided in the working chamber A. The outer dust collector 13 is connected.

  The outdoor dust collector 13 draws in air in the room I through the dust collecting duct 12 and collects dust and the like in the room I. By inhaling the room I, the room I is in a negative pressure state.

When dry ice blasting apparatus cleaned cleaning object by 1 (decontamination), first, the remote control heavy machinery 9 by remote operation, placing the injection nozzle 8 to a desired position of the wall surface W _S.
At this time, by using the outdoor dust collector 13, the indoor I is sucked into the room I to make negative pressure.

Then, by operating the dry ice blasting machine 2 and a compressor 3, for injecting a dry ice pellets against the wall W _S. As the dry ice pellets are jetted, the first indoor-side dust collector 11 is also operated to perform intake air in the nozzle cover 10 and collect removed matter (dust, etc.).

According to the dry ice blasting apparatus 1 of the present embodiment, long distance transportation of dry ice pellets is possible.
Since the transport hose 7 includes a portion whose inner diameter changes to a large diameter, the compressed air being transported is rapidly depressurized. Therefore, the compressed air is in an adiabatic expansion state and the temperature in the transport hose 7 can be lowered, and even when the transport distance by the transport hose 7 is long, the dry ice pellets being transported can be sublimated. Can be suppressed.

  In addition, since the compressed air supplied from the compressor 3 is cooled by liquefied nitrogen, it is possible to delay the sublimation of the dry ice pellets that has been started at the same time as contacting the compressed air.

  In addition, since the compressed air supplied from the compressor 3 is dehumidified by the air dryer 4, moisture in the air is prevented from condensing and adhering to the inside of the transport hose 7. That is, according to the dry ice blasting apparatus 1, it is possible to suppress a decrease in decontamination capability.

Moreover, since the transport hose 7 is covered with the heat insulating material 7a, the heat retaining effect of the transport hose 7 is enhanced. That is, since the inside of the transport hose 7 is prevented from being warmed by outside air, the low temperature state can be maintained for a long time.
Moreover, since the transport hose 7 has flexibility, the injection nozzle 8 can be arranged freely.

Since the injection nozzle 8 is covered by the nozzle cover 10, removed substance fall off from the wall surface W _S is prevented from being scattered around, diffusion of removal is suppressed. Moreover, since the dry ice pellet which sublimates after injection is used, secondary waste does not generate | occur | produce. Furthermore, since the air and dust in the nozzle cover 10 are sucked by the suction nozzle, the removed matter can be collected efficiently.
Therefore, the dry ice blasting apparatus 1 according to the present embodiment is effective in the decontamination work for radioactive substances and the like.

  Moreover, since the inside of the building B is operated in a negative pressure state, it is possible to prevent contaminants from flowing out from the room I to the room O.

  Since the remote control heavy machine 9 is used, the work in the room I can be performed unattended, and the possibility of harming the health of the worker is low and the safety is excellent.

<Second Embodiment>
Dry ice blasting device 1 of the second embodiment, as shown in FIG. 3, performing the decontamination of such radioactive substances adhering to the inner wall surface W _S of the room that forms part of a building B (washing object) Is.

Dry ice blasting device 1, to the wall surface W _{S (cleaned} object), by injecting the dry ice pellet is peeled contaminants adhering to the wall surface W _S (radioactive substances).
In this embodiment, dry ice pellets having a particle size of about 3 mm are used, but the particle size of the dry ice pellets is not limited.

  The dry ice blasting device 1 of the second embodiment is different from the dry ice blasting device 1 of the first embodiment in that the air cooling means 5 that is a gas cooling device includes a liquefied carbon dioxide generator 6c and a liquefied carbon dioxide cylinder 6d. Different from the ice blasting apparatus 1.

  In addition, the dry ice blasting machine 2, the compressor 3, the air dryer 4, the injection nozzle 8, the remote control heavy machine 9, the nozzle cover 10, the suction nozzle, the indoor dust collectors 11 and 16, the dust collecting duct 12, and the outdoor dust collector 13. The details are the same as the contents shown in the first embodiment, and thus detailed description is omitted.

The liquefied carbon dioxide generator 6c cools the compressed air. The outlet temperature of the liquefied carbon dioxide generator 6c is managed in the range of 0 ° C to -40 ° C.
The liquefied carbon dioxide generator 6 c is disposed between the dry ice blast machine 2 and the air dryer 4, and cools the compressed air whose humidity has been lowered by the air dryer 4.

The liquefied carbon dioxide gas generator 6c is connected to the liquefied carbon dioxide cylinder 6d, and vaporizes the liquefied carbon dioxide supplied from the liquefied carbon dioxide cylinder 6d.
Although the liquefied carbon dioxide generator 6c of this embodiment is arrange | positioned inside the working chamber A, the installation location of the liquefied carbon dioxide generator 6c is not limited.

The compressed air supplied from the compressor 3 passes through the liquefied carbon dioxide generator 6c, and thus contacts the liquefied carbon dioxide inside the liquefied carbon dioxide generator 6c. When the liquefied carbonic acid and the compressed air come into contact, the liquefied carbonic acid is vaporized and the compressed air is cooled.
Therefore, the compressed air supplied to the liquefied carbon dioxide generator 6c is supplied to the dry ice blast machine 2 in a cooled state.

The liquefied carbon dioxide cylinder 6d stores liquefied carbon dioxide for cooling the compressed air.
The liquefied carbon dioxide cylinder 6d is disposed outside the outdoor O and is connected to the liquefied carbon dioxide generator 6c. In this embodiment, the liquefied carbon dioxide cylinder 6d is disposed outside the work chamber A, but the liquefied carbon dioxide cylinder 6d may be disposed inside the work chamber A.

  The liquefied carbon dioxide cylinder 6d includes an opening / closing mechanism (not shown). The supply amount of liquefied carbonic acid can be adjusted by the opening / closing mechanism so that the temperature of the dry ice pellets falls within the control value.

  The transport hose 7 pumps the dry ice pellets discharged from the dry ice blasting machine 2 to the object to be cleaned.

  The transport hose 7 of the present embodiment is disposed on the hose member 17 (first hose member 17a) disposed on the injection nozzle 8 side (front end side) and on the dry ice blasting machine 2 side (base end side). The hose member 17 (second hose member 17b) is connected via an attachment jig 17c (see FIG. 2). The number of hose members 17 forming the transport hose 7 is not limited as long as it is two or more.

The hose member 17 of the present embodiment has a double tube structure of an inner tube made of silicon rubber and a stainless mesh covering the inner tube. The hose member 17 is covered with a resin heat insulating material 7a having flexibility.
Since the details of the other transport hose 7 are the same as the contents shown in the first embodiment, the detailed description is omitted.

  Since the method of cleaning (decontamination) of the object to be cleaned by the dry ice blasting apparatus 1 is the same as that shown in the first embodiment, detailed description thereof is omitted.

  According to the dry ice blasting apparatus 1 of the present embodiment, since the liquefied carbonic acid at −56.6 ° C. is used, the flow rate of the refrigerant can be easily adjusted and automatic control can be easily performed. Therefore, cleaning by remote operation is safe and easy.

  Since the liquefied carbon dioxide cylinder 6d can supply liquefied carbonic acid at a flow rate corresponding to the temperature of the dry ice pellets by an opening / closing mechanism, it is easier to manage the temperature of the dry ice pellets within a certain range. Can do. Therefore, decontamination work can be performed with higher quality by using the dry ice blasting apparatus 1. Therefore, the decontamination work period can be shortened and the decontamination cost can be reduced.

  In addition, since the compressed air supplied from the compressor 3 is cooled by liquefied carbon dioxide, it is possible to delay the sublimation of the dry ice pellets that has been started simultaneously with the contact with the compressed air.

Further, since the transport hose 7 is made of a double pipe structure composed of a silicon rubber inner pipe and a stainless mesh covering the inner pipe, flexibility is maintained even at low temperatures. It is excellent in heat retention and can maintain a low temperature state for a long time.
Moreover, since it is covered with the stainless steel mesh, the pipeline is not shielded by breakage or crushing.

  Since the effect of the dry ice blasting apparatus 1 of other 2nd embodiment is the same as the content shown in 1st embodiment, detailed description is abbreviate | omitted.

  The embodiment according to the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and the above-described components can be appropriately changed without departing from the spirit of the present invention.

  For example, in the embodiment, the case where the dust collecting duct 12 and the outdoor dust collector 13 are disposed has been described. However, the dust collecting duct 12 and the outdoor dust collector 13 may be disposed as necessary. It may be omitted.

In the embodiment, as the air cooling means 5, a gas cooling device provided with a liquefied gas evaporator 6a and a liquefied nitrogen cylinder 6b, or a gas cooling device provided with a liquefied carbon dioxide generator 6c and a liquefied carbon dioxide cylinder 6d. Although the case where it employ | adopted was demonstrated, the air cooling means 5 is not limited to a gas cooling device.
For example, as shown in FIG. 4, an antifreeze liquid cooling device that cools the compressed air by circulating the antifreeze liquid may be adopted as the air cooling means 5. A tank and a pump are integrated in the antifreeze cooling device.
Note that the gas cooling device and the antifreeze cooling device may be used in combination.

  Moreover, although the said embodiment demonstrated the case where the indoor side dust collectors 11 and 16 were arrange | positioned in the room I, there exists a possibility that a removal thing may scatter in the outdoor O by working in the state which pressure-reduced the inside of the building B. In the case where there is not, the indoor dust collectors 11 and 16 in the room I may be omitted.

The cleaning object is not limited to the wall surface W _S.
Further, cleaning using the dry ice blasting apparatus 1 is not limited to decontamination of radioactive substances.

  In the above embodiment, the expanded portion is provided in the transport hose at the connecting portion between the large diameter hose member 17a and the small diameter hose member 17b, but the large diameter hose member 17a and the small diameter hose member 17b A hose member, a valve, or the like having an enlarged diameter portion may be connected between them.

  The nozzle cover 10 may be used as necessary, and if the nozzle cover 10 cannot be brought into close contact, such as indoor piping, ducts, and various equipment, the use of the nozzle cover 10 may be omitted. Good. Further, a suction nozzle may be installed as necessary.

DESCRIPTION OF SYMBOLS 1 Dry ice blasting apparatus 2 Dry ice blasting machine 3 Compressor 4 Air dryer 5 Air cooling means 6a Liquefied gas evaporator 6b Liquefied nitrogen cylinder 6c Liquefied carbon dioxide generator 6d Liquefied carbon dioxide cylinder 7 Transportation hose 7a Heat insulation material 8 Injection nozzle 9 Remote Steering heavy machinery 10 Nozzle cover (cover)
11 First indoor dust collector (indoor dust collector)
12 Duct for dust collection 13 Outdoor dust collector 17 Hose member

Claims (6)

A dry ice blasting machine for supplying dry ice pellets;
A compressor for supplying compressed air to the dry ice blasting machine;
A transport hose for transporting dry ice pellets supplied from the dry ice blasting machine to an object to be cleaned;
An injection nozzle attached to the tip of the transport hose and injecting the dry ice pellets;
A dry ice blasting device comprising a remote control heavy machine that grips the injection nozzle,
The dry ice blasting apparatus, wherein the transport hose is covered with a heat insulating material. Between the dry ice blast machine and the compressor, at least one of a gas cooling device and an antifreeze liquid cooling device is provided, and air cooling means for cooling the compressed air is provided.
The gas cooling device includes a liquefied nitrogen cylinder that supplies liquefied nitrogen for cooling the compressed air, and a liquefied gas evaporator that is disposed between the dry ice blasting machine and the liquefied nitrogen cylinder to vaporize the liquefied nitrogen. And, including,
2. The dry ice blasting apparatus according to claim 1, wherein the antifreeze liquid cooling device has a tank and a pump integrated, and cools the compressed air by circulating the antifreeze liquid. Between the dry ice blasting machine and the compressor is provided with an air cooling means for cooling the compressed air by a gas cooling device,
The gas cooling device includes a liquefied carbon dioxide cylinder that supplies liquefied carbon dioxide for cooling the compressed air, and a liquefied carbon dioxide gas generator that is disposed between the dry ice blasting machine and the liquefied carbon dioxide cylinder to vaporize the liquefied carbon dioxide. The dry ice blasting apparatus according to claim 1, comprising a machine. The liquefied carbon dioxide cylinder has an open / close mechanism that adjusts the supply amount of the liquefied carbon dioxide so that the temperature of the dry ice pellets falls within a control value,
4. The dry ice blasting apparatus according to claim 3, wherein the transport hose is composed of an inner tube made of silicon rubber and a double structure in which the inner tube is covered with a stainless steel mesh. The transport hose is formed by connecting at least two hose members having different inner diameters,
The inner diameter of the hose member disposed on the spray nozzle side is larger than the inner diameter of the hose member disposed on the dry ice blasting machine side. 2. A dry ice blasting apparatus according to item 1. The remote control heavy machine is disposed indoors,
A cover covering the periphery of the spray nozzle;
A suction nozzle for sucking air in the cover;
An indoor dust collector connected to the suction nozzle via a suction hose;
A dust collecting duct extending from the room to the outside;
The dry ice blasting device according to any one of claims 1 to 5, further comprising an outdoor dust collector connected to an outdoor end of the dust collection duct.

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