KR102463089B1 - A radioactivty removal apparatus on the surface of solide waste based on high-pressure abrasive spray - Google Patents

Abstract

The present invention relates to a device for removing radioactivity from the surface of solid waste based on high-pressure abrasive spraying. According to an embodiment of the present invention, there is provided an abrasive high-pressure spray-based radioactive removal device for the surface of solid waste, an air compression unit for compressing air; and a high-pressure spraying unit for high-pressure spraying of an abrasive to the radioactivity of the surface of the decontamination object by using the compressed known material.

Description

A radioactivty removal apparatus on the surface of solide waste based on high-pressure abrasive spray}

The present invention relates to a radioactivity control device on the surface of a solid waste contaminated with radioactivity, and more particularly, to an abrasive high-pressure injection-based radioactivity removal device on the surface of the solid waste.

In domestic operating nuclear power plants, about 100 drums of solid waste such as iron contaminated with radioactivity is generated per unit per year. expected.

In particular, about 80% of the solid waste generated from decommissioned nuclear power plants is iron and concrete waste, which is low-level and ultra-low-level radioactive waste with only a slightly contaminated surface. have.

However, until now, no special technology has been developed in Korea for decontamination of iron and concrete waste, so in actual nuclear power plant sites, workers are decontamination by hand using hand tools such as grinders, which causes radiation exposure and manpower consumption of workers very much. There is a limit to the reduction of radioactive waste due to the decrease in radioactive removal efficiency.

Therefore, there is an urgent need to develop a radioactive removal technology that can dramatically reduce radiation exposure of iron and concrete waste and workers contaminated with radioactivity, but research on this is insufficient.

[Patent Document 1] Korean Patent Publication No. 10-2022-0053270

The present invention was created in order to solve the above problems, and an object of the present invention is to provide an abrasive high-pressure injection-based device for removing radioactivity from the surface of solid waste.

Objects of the present invention are not limited to the objects mentioned above, and other objects not mentioned will be clearly understood from the description below.

In order to achieve the above objects, an abrasive high-pressure injection-based radioactive removal device on the surface of the solid waste according to an embodiment of the present invention, an air compression unit for compressing air; and a high-pressure spraying unit for high-pressure spraying an abrasive to the radioactivity of the surface of the decontamination object by using the compressed air.

In an embodiment, the apparatus for removing radioactivity from the surface of the solid waste based on high-pressure spraying of the abrasive may further include an abrasive recovery unit configured to recover the abrasive sprayed at high pressure to the radioactivity.

In an embodiment, the apparatus for removing radioactivity from the surface of the solid waste based on the high-pressure spraying of the abrasive may further include a radioactive purification unit for collecting the radioactivity removed from the surface by the high-pressure sprayed abrasive.

In an embodiment, the abrasive may include at least one of alumina oxide, ceramic beads, glass beads, and plastic beads.

In an embodiment, the apparatus for removing radioactivity from the surface of the solid waste based on the high-pressure injection of the abrasive may further include a control unit for adjusting the pressure of the high-pressure injection of the abrasive through the high-pressure injection unit.

In an embodiment, the recovered abrasive may be reused for high-pressure spraying of the high-pressure spraying unit.

In an embodiment, the apparatus for removing radioactivity from the surface of the solid waste based on high-pressure spraying of the abrasive may further include a housing for moving to block external leakage of radioactivity removed from the surface by the high-pressure spraying by maintaining a negative pressure.

Specific details for achieving the above objects will become clear with reference to the embodiments to be described in detail below in conjunction with the accompanying drawings.

However, the present invention is not limited to the embodiments disclosed below, and may be configured in various different forms, and those of ordinary skill in the art to which the present invention pertains ( Hereinafter, "a person skilled in the art") is provided to fully inform the scope of the invention.

According to an embodiment of the present invention, secondary waste such as contaminated waste water may hardly be generated when radioactivity is removed.

In addition, according to an embodiment of the present invention, the radioactive decontamination efficiency is very high, so that the amount of waste can be significantly reduced.

In addition, according to an embodiment of the present invention, the decontamination speed is very fast and remote operation is possible, so that the radiation exposure of the operator and the required manpower can be remarkably reduced.

In addition, according to an embodiment of the present invention, it is possible to perform the removal of radioactivity from the surface of the solid waste with a highly soluble portable device.

In addition, according to an embodiment of the present invention, the decontamination performance of radioactive solid waste generated during operation and dismantling of a nuclear power plant is very excellent, the decontamination rate is very fast, and it can be directly applied to the field.

The effects of the present invention are not limited to the above-described effects, and potential effects expected by the technical features of the present invention will be clearly understood from the following description.

1 is a view showing an apparatus for removing radioactivity from the surface of solid waste based on high-pressure abrasive spraying according to an embodiment of the present invention.
2A to 2D are diagrams illustrating examples of an abrasive according to an embodiment of the present invention.
Figure 3 is a view showing the functional configuration of the radiation removal device according to an embodiment of the present invention.

Since the present invention can have various changes and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail.

Various features of the invention disclosed in the claims may be better understood upon consideration of the drawings and detailed description. The apparatus, methods, preparations, and various embodiments disclosed herein are provided for purposes of illustration. The disclosed structural and functional features are intended to enable those skilled in the art to specifically practice the various embodiments, and are not intended to limit the scope of the invention. The terms and sentences disclosed are for the purpose of easy-to-understand descriptions of various features of the disclosed invention, and are not intended to limit the scope of the invention.

In describing the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

Hereinafter, an apparatus for removing radioactivity from the surface of solid waste based on high-pressure abrasive spraying according to an embodiment of the present invention will be described.

1 is a view showing an abrasive high-pressure spray-based solid waste surface radioactive removal device 100 according to an embodiment of the present invention.

Referring to FIG. 1 , the radiation removal device 100 includes an air compression unit 110 , a high-pressure injection unit 120 , an abrasive recovery unit 130 , a radiation purification unit 140 , a movable housing 150 , and a control unit 160 . ) may be included.

The air compression unit 110 may perform air compression and storage.

The high-pressure spraying unit 120 may spray a high-pressure abrasive to the radioactivity of the surface of the decontamination object. For example, the decontamination object may include solid waste such as iron and concrete waste.

In one embodiment, the high-pressure injection unit 120 may be capable of adjusting the pressure of the high-pressure injection.

In one embodiment, the high-pressure injection unit 120 may include an injection unit for injecting an abrasive.

For example, the high-pressure injector 120 may include a manual direct-pressure injector, an automatic suction-type injector, a conveyor-type injector, and a movable injector.

The abrasive recovery unit 130 may recover the used abrasive. For example, the abrasive recovery unit 130 may include a cyclone device.

The radioactivity purification unit 140 may collect and purify the radioactivity removed from the surface. For example, the radioactive purification unit 140 may include a fine bag type purification unit.

The mobile housing 150 may include a housing for a mobile workplace.

The control unit 160 may control the operations of the air compression unit 110 , the high-pressure injection unit 120 , the abrasive recovery unit 130 , the radiation purification unit 140 , and the movable housing 150 . For example, the controller 160 may control the pressure of the high-pressure injection of the high-pressure injection unit 120 .

The high-pressure spray unit 120 sprays an abrasive such as alumina oxide on the surface of the solid waste contaminated with radioactivity at a spray pressure of up to 9 bar to remove radioactivity and coating materials attached to the surface.

The abrasive recovery unit 130 may separate the used abrasive and reuse it. In one embodiment, the abrasive recovery unit 130 may transfer the recovered abrasive back to the high-pressure injector 120 so that the abrasive can be reused.

The radioactivity purification unit 140 may collect the removed radioactivity.

The control unit 160 may remotely control the radiation removal device 100 so that the radiation exposure of the operator is minimized.

The movable housing 150 can fundamentally block radioactive external leakage by maintaining a negative pressure.

According to the present invention, the abrasive spray technique can be applied to radioactive decontamination.

In addition, according to the present invention, the decontamination performance can be increased by 10 times and the decontamination speed by 10 times or more compared to the existing decontamination technology.

In addition, according to the present invention, the spraying pressure of the abrasive can be adjusted according to the degree of contamination of the decontamination object.

Further, according to the present invention, the used abrasive can be reused after recovery.

In addition, according to the present invention, it is possible to make the purification efficiency of the removed radioactivity 99.9995% or more.

In addition, according to the present invention, it is possible to minimize worker exposure by performing the decontamination operation remotely.

In addition, according to the present invention, it is possible to minimize the amount of secondary waste generated by using the bag (BAG) filter of the radioactive purification unit 140 .

In addition, according to the present invention, by adding a negative pressure function to the movable housing 150, it is possible to block the source of radiation outside diffusion.

In one embodiment, as a technique applicable to the removal of radioactivity from the surface of solid waste in a conventional decommissioned nuclear power plant and an operating nuclear power plant, there are chemical decontamination, electrolytic polishing, ultrasonic decontamination, high pressure decontamination, metal melting technology, etc. Comparing the advantages and disadvantages of the decontamination technology and the abrasive high-pressure spray decontamination technology according to the present invention and the applicability to the removal of radioactivity from the steel and concrete surfaces coated with epoxy, etc., it can be shown in <Table 1> below.

Compare Conventional decontamination method according to the invention
Abrasive high-pressure spray decontamination method chemistry
decontamination the year before
grinding ultrasonic decontamination high pressure water
decontamination metal
melt Decontamination performance middle middle very low middle height very high Decontamination speed height lowness lowness middle lowness very high Secondary waste generation plenty middle middle very much very much Almost none Facility complexity very complicated middle middle middle very complex simple Decontamination facility cost high price lowness lowness lowness very expensive lowness Cost of decontamination height lowness lowness lowness height very low decontamination object Metal/Non-Metal metal Metal/Non-Metal Metal/Non-Metal metal Metal/Non-Metal Damage to the decontamination object damage possible damaged no damage no damage damaged no damage Synthesis incongruity incongruity incongruity incongruity incongruity very suitable

2A to 2D are diagrams illustrating examples of an abrasive according to an embodiment of the present invention.

2A to 2D , the abrasive may include at least one of alumina oxide, ceramic beads, glass beads, and plastic beads.

Referring to FIG. 2A , alumina oxide has a longitudinal brown color and strong strength. In one embodiment, alumina oxide may be used for paint removal or surface treatment of carbon steel and castings.

Referring to FIG. 2B , ceramic beads may be used for excellent surface treatment and uniform surface treatment. In one embodiment, the ceramic beads may be used for surface treatment of molds such as plastic, rubber, glass and aluminum.

Referring to FIG. 2C , glass beads may be used for surface treatment of plastic, rubber, glass aluminum, and the like. For example, glass beads can be used to remove carbon from aircraft and power plant turbine blades and automobile engines.

Referring to FIG. 2D , the plastic beads are inexpensive and can be used to remove rust from iron and the like.

Figure 3 is a view showing the functional configuration of the radiation removal device according to an embodiment of the present invention. In one embodiment, the radiation removal device 300 of Figure 3 may include the radiation control device 100 of Figure 1 .

Referring to FIG. 3 , the radiation removal device 300 includes an air compression unit 310 , a high pressure injection unit 320 , an abrasive recovery unit 330 , a radiation purification unit 340 , a movable housing 350 , and a control unit 360 . ) may be included.

The air compression unit 310 may compress air.

The high-pressure spraying unit 320 may spray a high-pressure abrasive on the radioactivity of the surface of the decontamination target by using compressed air.

In one embodiment, the abrasive may include at least one of alumina oxide, ceramic mid, glass beads, and plastic beads, but is not limited thereto, and may include various abrasives.

The abrasive recovery unit 330 may recover the abrasive sprayed with high-pressure radiation. In one embodiment, the recovered abrasive may be reused for high-pressure spraying of the high-pressure spraying unit 320 .

The radioactivity purification unit 340 may collect radioactivity removed from the surface by the high-pressure sprayed abrasive.

The movable housing 350 may block external leakage of radioactivity removed from the surface by high-pressure injection by maintaining a negative pressure.

The control unit 360 may adjust the pressure of the high-pressure injection of the abrasive through the high-pressure injection unit 320 .

In one embodiment, the controller 360 may adjust the spraying pressure of the abrasive according to the degree of contamination of the decontamination object.

In an embodiment, the controller 360 may calculate characteristic relation information between the type of the abrasive and the type of the decontamination object, and adjust the pressure of high-pressure jetting of the abrasive according to the characteristic relation information.

For example, the property relationship information may include strength information between the abrasive and the decontamination target.

In one embodiment, the control unit 360 may control the injection into the high-pressure injection unit 320 by adjusting the ratio of the abrasive to be recovered and reused and the abrasive that is initially injected and used according to the degree of contamination of the decontamination object.

In an embodiment, the controller 360 may include at least one processor or microprocessor, or may be a part of the processor. Also, the controller 360 may be referred to as a communication processor (CP). The controller 360 may control the operation of the radiation removal device 300 according to various embodiments of the present invention.

Referring to FIG. 3 , the radiation removal device 300 includes an air compression unit 310 , a high pressure injection unit 320 , an abrasive recovery unit 330 , a radiation purification unit 340 , a movable housing 350 , and a control unit 360 . ) may be included. In various embodiments of the present invention, the radiation removal device 300 is not essential to the configurations described in FIG. 3, so it may be implemented with more configurations than those described in FIG. 3, or having fewer configurations. have.

The above description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention.

The various embodiments disclosed herein may be performed out of order, and may be performed simultaneously or separately.

In one embodiment, at least one step may be omitted or added in each figure described herein, may be performed in the reverse order, or may be performed simultaneously.

The embodiments disclosed in the present specification are not intended to limit the technical spirit of the present invention, but to illustrate, and the scope of the present invention is not limited by these embodiments.

The protection scope of the present invention should be interpreted by the claims, and all technical ideas within the scope equivalent thereto should be understood to be included in the scope of the present invention.

100: radioactive removal device
110: air compression unit
120: high pressure injection unit
130: abrasive recovery unit
140: radioactive purification unit
150: movable housing
160: control unit
300: radioactive removal device
310: air compression unit
320: high pressure injection unit
330: abrasive recovery unit
340: radioactive purification unit
350: movable housing
360: control

Claims (7)

an air compression unit for compressing air;
a high-pressure spraying unit for high-pressure spraying an abrasive to the radioactive material on the surface of the decontamination object by using the compressed air;
an abrasive recovery unit for recovering the high-pressure sprayed abrasive; and
a control unit for calculating characteristic relation information between the type of the abrasive and the type of the decontamination target through the high-pressure injection unit, and adjusting the pressure of the high-pressure injection of the abrasive according to the characteristic relation information;
including,
The characteristic relationship information includes strength information between the abrasive and the decontamination object,
The recovered abrasive is reused for high-pressure spraying of the high-pressure spraying unit,
The control unit controls the ratio of the abrasive to be recovered and reused according to the degree of contamination of the decontamination object and the abrasive to be injected and used for the first time to be injected into the high-pressure spraying unit,
A device for removing radioactivity from the surface of solid waste based on high-pressure abrasive jetting.
delete According to claim 1,
a radioactive purification unit for collecting the radioactive material removed from the surface by the high-pressure sprayed abrasive;
further comprising,
A device for removing radioactivity from the surface of solid waste based on high-pressure abrasive jetting.
According to claim 1,
The abrasive comprises at least one of alumina oxide, ceramic beads, glass beads and plastic beads,
A device for removing radioactivity from the surface of solid waste based on high-pressure abrasive jetting.
delete delete According to claim 1,
a housing for moving to block external leakage of the radioactive material removed from the surface by the high-pressure injection by maintaining a negative pressure;
further comprising,
A device for removing radioactivity from the surface of solid waste based on high-pressure abrasive jetting.

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