KR20180078885A - Movable soil sterilizer - Google Patents

Abstract

The present invention relates to a movable soil sterilization apparatus for sterilizing soil using an electron beam, which comprises the following: a moving vehicle (100) capable of moving; an electron accelerator (200) provided in the moving vehicle and capable of generating an electron beam in a continuous mode; a shielding body (120) shielding the electron accelerator (200); and a transportation means (110) provided on the moving vehicle (100) for transporting soil in the electron beam irradiation direction of the electron accelerator (200).

Description

[0001] MOVABLE SOIL STERILIZER [0002]

The present invention relates to a mobile sterilization apparatus for sterilizing soil using an electron beam.

Soil sterilization refers to treating the soil physically or chemically in order to reduce the density of pathogens appearing in the soil in the control of soil infectious diseases.

The physical soil disinfection method is to heat the soil, and the heating method is steam disinfection and soot which injects high pressure steam into the soil. In some cases, a polyethylene film is stretched on the surface to accumulate solar heat to disinfect the soil. Chemical soil disinfection is the introduction of a disinfectant into the soil, and soil fumigation is commonly used to inject gaseous disinfectants into the soil at room temperature.

For example, the ginseng is quite good in terms of its effect and price, but it is mainly grown in 4-year-olds before growing to 6-year-old due to various fungi (Cylindrocarpon destrutans, Fusarium solani, Erwinia carotovora, Pseudomonas fluorescens) It is a reality that there are many cases to harvest.

Also, even after ginseng is harvested, ginseng fields can not be sequenced because these harmful fungi remain in the soil. For this reason, conventionally, fumigation disinfection methods for disinfecting the soil of ginseng fields prior to cultivation of ginseng, and a method of cultivating a crop for avoiding the sequence itself have been used. However, the fumigation disinfection method has a high possibility that the nitrogen content of the soil is increased due to the ammonia-based nitrogen generated by the decomposition of the chloropicrin in the soil, and thus the physiological disorder is likely to be induced in the ginseng. In the case of the centrifugal cultivation method, There is a problem in that it is limited. In particular, there is a risk that the chemical fertilizer component present in the rice paddy may induce a yellowing of ginseng due to the presence of the chemical fertilizer component in the rice field, so that rye and the like must be cultivated to absorb the residual inorganic nutrients.

In addition, it is not easy to grow high quality 6 - year - old Korean ginseng because it is very difficult to prevent roots rot of ginseng root caused by root infections of Cylindrocarpon dustructans Scholten or to detect root rot disease early. Even if the ginseng has succeeded in cultivation, it is difficult to cultivate ginseng in succession because of the fungus already existing in the soil of the ginseng field.

In order to solve these problems, Korean Patent Registration No. 10-0885860 (Publication Date: 2009.02.26) discloses a method for sterilizing fungi in soil by irradiating a high-energy electron beam to soil to prevent various diseases of ginseng cultivation, A sterilization method and a sterilization apparatus capable of growing ginseng crops have been proposed.

As another prior art, Japanese Patent Application Laid-Open No. 2003-145128 (published on May 20, 2003) discloses a method for purifying soil contaminated with harmful substances such as dioxins and halogenated organic compounds such as polychlorinated biphenyls Discloses a contaminated soil purification method and apparatus for purifying soil by irradiating an electron beam.

On the other hand, the electron beam for the sterilization treatment of the soil requires a long and high power for processing a large amount of soil, and thus a large and complicated electron accelerator is required. Therefore, it is difficult to move and there are many restrictions in use.

Patent Registration No. 10-0885860 (Publication Date: Feb. 26, 2009)

Japanese Patent Application Laid-Open No. 2003-145128 (published on May 20, 2003)

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a portable sterilizing apparatus for sterilizing soil using electron beams.

According to an aspect of the present invention, there is provided a portable soil sterilization apparatus comprising: a traveling vehicle capable of traveling; An electron accelerator provided in the moving vehicle and capable of generating an electron beam in a continuous mode; A shield for shielding the electron accelerator; And transporting means provided on the moving vehicle for transporting the soil in the electron beam irradiation direction of the electron accelerator.

Preferably, the electron accelerator includes: an RF electron gun for generating electrons; A linear acceleration tube for accelerating electrons generated from the RF electron gun; And an RF generator for generating an RF signal corresponding to a resonance frequency of the linear acceleration tube.

More preferably, the RF electron gun includes a body portion in which a plurality of cavity cells are formed in the beam line direction by an iris; A photo cathode portion provided at one end of the cavity of the body portion; A laser generating unit for irradiating the photocathode with a laser; A reference signal generator for generating a reference signal in the RF generator and the laser generator; And a phase adjuster provided between the reference signal generator and the laser generator to adjust the phase.

Preferably, the body portion includes an electron beam exit port in which a cavity cell is formed and accelerated electron beams are emitted from the cavity cell, and a first solenoid for generating a magnetic field in the axial direction is formed on the outer circumferential surface of the electron beam exit port .

More preferably, a second solenoid for reducing the magnetic field in the axial direction adjacent to the phototube portion is further included.

Preferably, the laser generating unit generates a continuous laser pulse signal, and more preferably, generates a continuous laser pulse signal having the same frequency as the RF generating unit.

Preferably, the apparatus further includes a pressure vessel filled with an insulating gas to receive the electron accelerator, and a scan chamber located at a lower portion of the pressure vessel and irradiating the electron accelerator with an electron beam.

The mobile soil sterilization apparatus according to the present invention comprises a moving vehicle equipped with an electron accelerator capable of generating a continuous high-power electron beam, and can be moved to a position where sterilization operation of the soil is required, so that soil sterilization and restoration work There is an effect that it can be done quickly and conveniently.

1 (a) and 1 (b) are a side view and a front view, respectively, of a mobile soil sterilizer according to the present invention;
2 is a configuration diagram of an electron accelerator according to a preferred embodiment of the present invention,
3 is a schematic configuration diagram of a RF electron gun according to a preferred embodiment of the present invention,
FIG. 4 is a sectional view of a RF electron gun according to a preferred embodiment of the present invention,
5A and 5B are graphs showing the relationship between the electric field and the laser pulse waveform by the resonant frequency in the continuous mode of the RF electron gun according to the preferred embodiment of the present invention.

The specific structure or functional description presented in the embodiment of the present invention is merely illustrative for the purpose of illustrating an embodiment according to the concept of the present invention, and embodiments according to the concept of the present invention can be implemented in various forms. And should not be construed as limited to the embodiments described herein, but should be understood to include all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Meanwhile, in the present invention, the terms first and / or second etc. may be used to describe various components, but the components are not limited to the terms. The terms may be referred to as a second element only for the purpose of distinguishing one element from another, for example, to the extent that it does not depart from the scope of the invention in accordance with the concept of the present invention, Similarly, the second component may also be referred to as the first component.

Whenever an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but it should be understood that other elements may be present in between something to do. On the other hand, when it is mentioned that an element is "directly connected" or "directly contacted" to another element, it should be understood that there are no other elements in between. Other expressions for describing the relationship between components, such as "between" and "between" or "adjacent to" and "directly adjacent to" should also be interpreted.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. It will be further understood that the terms " comprises ", or "having ", and the like in the specification are intended to specify the presence of stated features, integers, But do not preclude the presence or addition of steps, operations, elements, parts, or combinations thereof.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 (a) and 1 (b) are a side view and a front view, respectively, of a mobile soil sterilizer according to the present invention.

Referring to FIG. 1, the present invention includes a traveling vehicle 100 capable of traveling, an electron accelerator 200 provided in the moving vehicle 100 to generate an electron beam in a continuous mode, And a conveying means provided on the moving vehicle 100 for conveying the soil in the electron beam irradiating direction of the electron accelerator 200.

The moving vehicle 100 is provided with a wheel 101 on a vehicle body 101 and is driven by a separate towing vehicle and a cargo box 103 on which sterilizing equipment is stored is installed on the upper part of the vehicle body 101. On the other hand, the moving vehicle may be capable of running on its own with the engine mounted directly.

The body 101 is composed of a trailer structure, and the lower part of the trailer structure is connected to the ground so that the sterilized soil can be discharged through the lower part of the body 101.

Inside the cargo box 103, an electron accelerator 200 for generating an electron beam and an auxiliary equipment for operating the electron accelerator 200 are provided. The auxiliary equipment includes a cooling unit 310 for circulating and supplying cooling water to the electron accelerator 200, A power supply unit 320 for supplying power, and a control unit 330 for controlling the electron accelerator 200.

The cooling unit 310 includes a pump for circulating cooling water.

The power supply unit 320 supplies power necessary for the operation of the electron accelerator 200 and includes an RF generator for generating an RF signal to the electron accelerator 200 for electron acceleration.

The cargo box 103 can be applied with a shielding structure capable of shielding X-rays as braking radiation and electron beams of high energy that may be generated during operation of the electron accelerator.

Preferably, the electron accelerator 200 is housed in a separate shield 120.

The shield 120 may be formed of lead and steel so as to surround the electron accelerator 200 and some additional equipment may be provided in the shield 120 as well.

In this embodiment, the shield 120 has a three-layer structure composed of an iron plate 121, a lead plate 122 and an iron plate 123, and a lead plate or a lead block is filled between the two plates 121 and 123 And the two steel plates 121 and 123 have a proper thickness within a range in which deformation of the case does not occur due to the weight of the lead.

The plasma display apparatus further includes a shielding body configured by a pressure vessel 130 and a scan chamber 140 disposed inside the shielding body 120 to shield the electron accelerator 200.

An SF6 gas for insulation is filled in the pressure vessel 130 to place the electron accelerator 200. The scan chamber 140 is disposed under the pressure vessel 130 and is connected to a scan horn 210).

The pressure vessel 130 and the scan chamber 140 have a shielding structure composed of lead and steel.

The conveying means is arranged to pass under the scan horn 210 of the electron accelerator 200 to convey the soil in the electron beam irradiating direction. In this embodiment, the conveying means includes a conveyor belt But the present invention is not limited thereto.

On the other hand, the shielding body 120 and the scan chamber 140 can be provided with a passage at a position where the conveyor belt 110 passes, and the conveying means is disposed on the bottom side of the vehicle body 101 so as to prevent the radiation from leaking through the passage And the passageway is not directly exposed to the outside.

The electron accelerator 200 is for generating an electron beam. Preferably, the electron accelerator 200 emits an electron beam in a continuous mode. In addition, the electron accelerator 200 can be sterilized for a compact size and a large amount of soil so that the electron beam can be loaded on a moving vehicle A continuous high-power electron beam irradiation is required, and a specific embodiment thereof will be described again with reference to the related drawings.

2 is a configuration diagram of an electron accelerator according to a preferred embodiment of the present invention.

2, the electron accelerator 200 includes a RF electron gun 220 for generating electrons, a linear acceleration tube 230 for accelerating electrons generated from the RF electron gun 220, And an RF generator 321 for generating an RF signal for performing the RF signal.

In particular, the RF electron gun 220 of the present invention includes a photo cathode as an electron generating source in which photoelectrons are emitted by a laser pulse, and the electron gun bundle 220 is driven by a continuous laser pulse signal synchronized with a resonant frequency electron bunch).

The electron beam generated from the RF electron gun 220 is accelerated by the linear accelerators 230 and 240. The linear accelerators 230 and 240 preferably accelerate the electron beam generated from the RF electron gun 220 A first linear accelerator tube 230 for accelerating the electron beam accelerated by the first linear accelerator tube 240 to a target output 240).

The linear accelerators 230 and 240 have a structure in which a plurality of cavity cells communicate with the iris along the beam line direction and are accelerated by an electric field formed by the resonance frequency applied in the cavity cell.

The second linear accelerating tube 240 is provided with a scan horn 210 having an annular shape at an end where the electron beam is output and an exit window of titanium having high transparency of electrons is provided at the open end of the scan horn 210 .

A scan magnet 251 is provided at an end of the second linear acceleration tube 240 to sweep the electron beam to the soil moved by the conveyor.

In another embodiment, a copper or tungsten target is provided at the output end of the second linear acceleration tube 240 so that an electron beam is irradiated on the target, and X-rays are emitted to sterilize the soil using X-rays.

The RF generator 321 generates a high-output RF signal for accelerating the electron beam, and generates an RF signal corresponding to the resonance frequency (cavity cell) of the linear accelerator. The RF generator may be a magnetron or a klystron.

3 is a schematic configuration diagram of a RF electron gun according to a preferred embodiment of the present invention.

3, the RF electron gun 220 of the present invention includes a body portion 221 having a hollow cell, a photo cathode portion 222 provided at one end of the hollow cell 221a of the body portion 221, An RF generator 321 for generating a high output RF signal in the cavity cell 221a and an RF generator 321 for generating a high output RF signal in the cavity cell 221a, A reference signal generating unit 322 for generating a reference signal at the reference signal generating unit 322 and a phase adjusting unit 323 for adjusting the phase of a reference signal transmitted from the reference signal generating unit 322 to the laser generating unit 223 .

A cavity 221a is formed in the body 221 and an electron beam outlet port 224 is provided at one end of the cavity 221. The cavity 221a may be resonated at the same frequency as a specific high frequency input And the resonance performance of the cavity cell can be represented by a Q value. The cavity cell 221a of the body 221 may be a single cell and preferably a plurality of cavity cells for accelerating the electron beam in the beam line direction are connected by iris to obtain a high- .

A first solenoid 225 for generating a magnetic field in the axial direction is provided on the outer circumferential surface of the electron beam outlet port 224 and the first solenoid 225 forms a magnetic field in the beam line C direction, 222 are focused and emitted along the beam line C as shown in FIG. Meanwhile, the first solenoid 225 is housed in a ferromagnetic housing (not shown), so that a more uniform magnetic field can be formed in the axial direction.

The body portion 221a is formed with a cooling water channel 221b and the body portion 221 can maintain a constant temperature during operation by deionized water w circulated and supplied along the cooling water channel 221b. Particularly, such cooling means prevents the resonance frequency change and the output decrease of the photoelectron gun due to the thermal deformation during the continuous wave (CW) mode operation in order to obtain a high output electron beam.

The photo cathode part 222 is fixed to the body part 221 and is located in the cavity 221a and laser light is emitted to emit the photoelectrons and metal cathodes (Cu, Mg, etc.) An optical semiconductor thin film material having a high quantum efficiency can be used, and examples thereof include CsI, an alkali iodide of CsI-Ge or an alkali antimonide such as K2CsSb, Na2K (Cs) Sb, or Cs2Te , RbCsTe, and the like.

Preferably, the photo cathode portion 222 is provided by a plug-shaped photo cathode plug capable of being detached and exchanged with the body portion 221, so that the deteriorated photo cathode can be easily exchanged.

The second solenoid 226 may be provided adjacent to the photo cathode portion 222 and the second solenoid 226 may reduce the magnetic field in the axial direction so that a magnetic field is not formed along the surface of the photo cathode portion 222 Thereby preventing a decrease in the emittance of the electrons generated in the photo cathode part 222.

The laser generating unit 223 generates a photoelectron by irradiating a laser beam to the photo cathode unit 222. The laser generating unit 223 is directly attached to the body 221 in FIG. For example, the laser generating part 223 is provided separately from the body part 221, and a laser incidence port is provided in the body part 2221 so that the laser can be guided to the optical cathode part 222 through the incidence port, (Reflecting mirrors) for guiding the direction of the light beam.

The RF signal generated in the RF generating unit 321 is transmitted to the cavity cell 221a of the body 221 through the waveguide 227 and high frequency resonance is performed in the cavity cell 221a. On the other hand, the photoelectrons generated in the photo cathode part 222 are accelerated by the electric field formed by the resonance in the cavity cell 221a, and are emitted through the electron beam exit port 224.

The reference signal is transmitted to the laser generation unit 223 and the RF generation unit 321 and is transmitted to the laser generation unit 223 and the RF generation unit 321. The reference signal generation unit 322 generates a reference signal, Are synchronized and operated on the same frequency.

The phase adjusting unit 323 is provided between the reference signal generating unit 322 and the laser generating unit 223 and is for adjusting the phase of the reference signal transmitted to the laser generating unit 223.

4 is a cross-sectional view of a RF electron gun according to a preferred embodiment of the present invention.

Referring to FIG. 4, in the present embodiment, four cell blocks are integrally joined together by brazing welding to form three coaxial cells 221a ', 221a' ', 221a' '' And the first cavity cell 221a 'to be positioned in the photo cathode part 222 is composed of a half cell (0.5 cell), so that the electric field intensity at the cathode face is maximized. The second cavity cell 221a '' and the third cavity cell 221a '' 'are made of full cells, and the size (length) of each cavity cell can be expressed by the following equation (1) Is determined by the speed of the electron beam.

[Equation 1]

Above where v is _RF λ is the wavelength of the resonance frequency, v is the velocity of the electron beam, c is the speed of light.

In this embodiment, Argos (R) CW laser (ND: YVO4) (10 W @ 350 MHz, 532 nm) is used as a high output CW laser light source irradiated on the photo cathode part 222, and a beam of 300 keV at a resonance frequency of 2,450 MHz Energy was obtained and accelerated by two linear accelerators 230 and 240 to obtain an electron beam energy of 3 MeV. On the other hand, the total length of the linear accelerators 230 and 240 for obtaining an electron beam of 3 MeV is approximately 2 m, which is suitable for mounting on a moving vehicle.

5A and 5B are graphs showing the relationship between the electric field and the laser pulse waveform according to the resonant frequency in the continuous mode of the RF electron gun according to the preferred embodiment of the present invention.

Referring to FIG. 5, an electric field E having a constant period corresponding to the resonance frequency is generated in the cavity of the body part. When a continuous laser pulse having the same frequency as the resonance frequency is generated in the laser generation part, The photoelectrons generated in the part are accelerated by the magnetic field formed by the resonance frequency, and a continuous electron bunch is generated every cycle of the resonance frequency.

The portable soil sterilization apparatus of the present invention constructed as described above employs an electron accelerator of a compact structure and has a beam output of 50 kW to 100 kW (maximum 400 kW), and it is possible to perform soil sterilization treatment (15 kGy, 2.5 MeV) of 15 ton per hour At this time, the electron accelerator and its auxiliary facilities can be installed in a space of 5m ㅧ 5m ㅧ 5m or less.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be apparent to those of ordinary skill in the art.

100: Moving vehicle 110: Conveyor belt
120: shielding body 130: pressure vessel
140: scan chamber 200: electron accelerator
210: scan horn 220: RF electron gun
225: first solenoid 226: second solenoid
230: first linear acceleration tube 240: second linear acceleration tube
310: Cooling unit 320: Power supply unit
321: RF generator 322: reference signal generator
323: phase adjusting unit 330:

Claims (8)

A traveling vehicle capable of traveling;
An electron accelerator provided in the moving vehicle and capable of generating an electron beam in a continuous mode;
A shield for shielding the electron accelerator;
And transporting means provided on the moving vehicle for transporting the soil in the electron beam irradiation direction of the electron accelerator. The electronic accelerator according to claim 1,
An RF electron gun for generating electrons;
A linear acceleration tube for accelerating electrons generated from the RF electron gun;
And an RF generator for generating an RF signal corresponding to a resonant frequency of the linear accelerator. The RF electron gun according to claim 2,
A body portion in which a plurality of hollow cells are communicated with an iris in a beam line direction;
A photo cathode portion provided at one end of the cavity of the body portion;
A laser generating unit for irradiating the photocathode with a laser;
A reference signal generator for generating a reference signal in the RF generator and the laser generator;
And a phase adjusting unit provided between the reference signal generating unit and the laser generating unit to adjust a phase. The apparatus of claim 3, wherein the body includes an electron beam exit port in which a cavity cell is formed and accelerated electron beam is emitted from the cavity cell, Further comprising a solenoid. The apparatus according to claim 3 or 4, further comprising a second solenoid for reducing a magnetic field in the axial direction adjacent to the phototube unit. 4. The apparatus of claim 3, wherein the laser generator generates a continuous laser pulse signal. The apparatus of claim 6, wherein the laser generator generates a continuous laser pulse signal having the same frequency as the RF generator. The apparatus according to claim 1, further comprising: a pressure vessel filled with an insulating gas to store the electron accelerator; and a scan chamber located at a lower portion of the pressure vessel and irradiating an electron beam of the electron accelerator.

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