Radioactive gas extraction device with external irradiation shielding function and manufacturing and using method thereof

Abstract

The invention relates to a radioactive gas extraction device with an external irradiation shielding function and a manufacturing and using method thereof. The device comprises a shell (1), a gas guide joint nut (2), a gas guide tube (3), a gas outlet joint (4), a gas outlet joint nut (5), a heating layer (6) and an external shielding layer (7), a radioactive gas to-be-extracted product is arranged in the shell (1), the gas guide connector nut (2) is communicated with the interior of the shell (1) through the gas guide pipe (3), the gas outlet connector nut (5) is communicated with the interior of the shell (1) through the gas outlet connector (4), and a heating layer (6) and an outer shielding layer (7) are sequentially arranged on the outer side of the shell (1). Compared with the prior art, the external radiation shielding function of the device is expected to achieve the effects of a traditional extraction hot chamber and an extraction furnace, and meanwhile, conditions can be created for continuous extraction of radioactive gas.

Description

Technical Field

[0001] This invention relates to the field of nuclear production equipment technology, and in particular to a radioactive gas extraction device with external irradiation shielding function, and its manufacturing and usage methods. Background Technology

[0002] In the extraction of radioactive gases, components containing radioactive gas components often have a certain external radiation dose, or the radioactive gas itself has a certain external radiation dose. Traditional extraction methods typically involve constructing an extraction hot chamber with dedicated extraction equipment inside. While this method can extract radioactive gases, the transfer of the extracted radioactive material is extremely complex, with very low transfer-in and transfer-out efficiency, and the amount of extracted radioactive gas that can be transferred is also greatly limited. Furthermore, this extraction method can only achieve intermittent extraction, with most of the time spent on the transfer-in, transfer-out, and heating / cooling processes of the extraction furnace. Therefore, traditional methods are difficult to implement for large-scale, low-cost production of radioactive gases, significantly limiting extraction capacity. At the same time, constructing an extraction hot chamber requires substantial investment, which also significantly increases the production cost of radioactive gases.

[0003] In conclusion, there is an urgent need to develop a radioactive extraction device with external irradiation shielding function to achieve large-scale and low-cost extraction of radioactive gases without the need to construct an extraction hot chamber. Summary of the Invention

[0004] The purpose of this invention is to provide a radioactive gas extraction device with external irradiation shielding function, as well as its manufacturing and usage methods. The external irradiation shielding function of this device is expected to realize the functions of traditional extraction hot chambers and extraction furnaces, and at the same time, it can create conditions for the continuous extraction of radioactive gases.

[0005] The objective of this invention can be achieved through the following technical solution: a radioactive gas extraction device with external irradiation shielding function, comprising a shell, a gas guide connector nut, a gas guide pipe, a gas outlet connector, a gas outlet connector nut, a heating layer and an outer shielding layer; The housing contains radioactive gas to be extracted. The gas inlet nut is connected to the inside of the housing through the gas inlet pipe, and the gas outlet nut is connected to the inside of the housing through the gas outlet connector. The outer side of the housing is provided with a heating layer and an outer shielding layer in sequence.

[0006] Preferably, a distribution plate is provided inside the shell, and the radioactive gas to be extracted is placed on the distribution plate.

[0007] More preferably, the air guide tube is connected to the opening on the upper side of the housing, the air guide tube runs downward along the inner wall of the housing, and is connected to the center hole of the distribution plate.

[0008] More preferably, the distribution plate is located 20-30 mm above the bottom of the housing.

[0009] More preferably, the diameter of the central hole of the distribution plate is 10~12mm, and the diameter of the air distribution hole is ≤6mm.

[0010] More preferably, the distribution plate is made of tungsten-nickel-iron alloy.

[0011] More preferably, the distribution plate is circular.

[0012] More preferably, the distribution plate has the following dimensions: Φ80~400mm and a thickness of 3~5mm.

[0013] Preferably, the bottom of the housing is provided with a housing bottom.

[0014] More preferably, the bottom of the housing is welded to the bottom of the housing.

[0015] More preferably, the bottom of the shell is made of tungsten-nickel-iron alloy.

[0016] More preferably, the bottom dimensions of the housing are required to be Φ30~450mm and the thickness is 8~50mm.

[0017] Preferably, the top of the housing is connected to the lower flange, and the lower flange is connected to the upper flange; The vent connector is connected to the center hole at the top of the upper flange.

[0018] More preferably, the top of the housing is welded to the lower flange.

[0019] More preferably, a filter head is connected to the bottom of the upper flange.

[0020] More preferably, the filter head cover is located outside the center hole at the bottom of the upper flange.

[0021] More preferably, the filter head is made of 316L stainless steel.

[0022] More preferably, the filter head has the following dimensions: Φ50~60mm and height: 50~60mm.

[0023] More preferably, the filter head has a pore size of 5~10μm.

[0024] More preferably, the lower flange and the upper flange are connected by bolts in the flange hole.

[0025] More preferably, the bolt material is: ≥ carbon steel grade 8.8, M16~18, and length ≥ 70mm.

[0026] More preferably, the material of the nut matching the bolt is: ≥ carbon steel grade 8.8, M16~18.

[0027] More preferably, the spring washer for the bolt is made of 65Mn.

[0028] More preferably, the upper flange is made of tungsten-nickel-iron alloy.

[0029] More preferably, the upper flange has the following dimensions: Φ100~500mm, thickness 10~50mm.

[0030] More preferably, the lower flange is made of tungsten-nickel-iron alloy.

[0031] More preferably, the lower flange has the following dimensions: Φ100~500mm, thickness 16~18mm.

[0032] More preferably, a sealing gasket is provided between the lower flange and the upper flange.

[0033] More preferably, the sealing gasket is made of oxygen-free copper.

[0034] More preferably, the sealing gasket has the following dimensions: Φ90~490mm, and a thickness of 6~8mm.

[0035] More preferably, the sealing gasket is circular.

[0036] More preferably, the sharp edges of the sealing gasket are deburred, and the surface roughness is ≤3.2.

[0037] Preferably, the heating layer is an electric furnace.

[0038] More preferably, the heating furnace includes heating wires, a furnace shell, and a heat insulation layer.

[0039] More preferably, the heating wire is made of nickel-chromium alloy with a nickel content ≤35% and a chromium content ≤20%.

[0040] More preferably, the furnace shell is made of tungsten-nickel-iron alloy.

[0041] More preferably, the thickness of the electric furnace shell is 8~50mm.

[0042] More preferably, the thermal insulation layer contains aluminum silicate fibers.

[0043] More preferably, the heating furnace has the following dimensions: inner diameter Φ50~500, height 200~1200mm.

[0044] Preferably, the heating layer is connected by a split snap fastener.

[0045] Preferably, the outer shielding layer contains a material that can shield X-rays and γ-rays.

[0046] More preferably, the material capable of shielding X-rays and gamma rays includes lead (Pd) or tungsten (W).

[0047] More preferably, the outer shielding layer has the following dimensions: Φ350~450mm, thickness 50~100mm, and height 350~400mm.

[0048] Preferably, the outer shielding layer is located outside the heating layer and is connected by a split snap fastener.

[0049] Preferably, the housing is made of tungsten-nickel-iron alloy.

[0050] Preferably, the housing is a tubular structure with openings at the top and bottom.

[0051] Preferably, the dimensions of the shell are: Φ30~450mm; wall thickness 8~50mm; length 100~1000mm.

[0052] Preferably, the air guide nut is made of Q275 chrome-plated material with a wall thickness of ≥5mm.

[0053] Preferably, the surface roughness of the air guide nut is ≤3.2.

[0054] Preferably, the air guide tube is made of tungsten-nickel-iron alloy.

[0055] Preferably, the dimensions of the air guide tube are: Φ10~14mm, wall thickness 1.5~2.5mm, and length 320~350mm.

[0056] Preferably, the vent connector nut is made of Q275 chrome-plated material with a wall thickness of ≥5mm.

[0057] Preferably, the air outlet connector is made of 316L stainless steel.

[0058] Preferably, the outer diameter of the air outlet connector is ≤Φ22 and the length is ≥50mm.

[0059] Preferably, the surface roughness of the air outlet connector is ≤3.2.

[0060] Preferably, the heating layer and the outer shielding layer are provided with thermocouple sockets.

[0061] More preferably, the thermocouple socket is made of a ceramic insulating tube.

[0062] More preferably, the thermocouple socket has a socket depth of 70~150mm and an inner diameter of Φ8~16mm.

[0063] More preferably, the heating layer, the outer shielding layer, and the housing are provided with thermocouple sockets.

[0064] A method for manufacturing the above-mentioned radioactive gas extraction device with external irradiation shielding function includes the following steps: A1: Connect the vent connector nut to the vent connector with the thread facing upwards, and weld the vent connector to the center hole of the flange on the top of the housing. A2: Connect the vent connector nut to the vent pipe with the thread facing outwards. Weld the vent pipe to the opening on the side wall of the housing and extend into the housing. A3: A heating layer and an outer shielding layer are sequentially arranged on the outside of the casing.

[0065] Preferably, the method for manufacturing the radioactive gas extraction device with external irradiation shielding function includes the following steps: A11: Connect the vent connector nut to the vent connector with the thread facing upwards, and weld the vent connector to the center hole of the upper flange on the top of the housing. A12: Connect the vent connector nut to the vent pipe with the thread facing outwards. Weld the vent pipe to the opening on the side wall of the housing and extend into the housing. A13: Weld the lower flange at the top of the housing to the housing; A14: Weld the distribution plate to the air duct and the shell; A15: Install a sealing gasket between the upper flange and the lower flange, and connect the upper flange and the lower flange with bolts; A16: Weld the bottom of the shell to the shell; A17: A heating layer is provided on the outside of the casing; A18: An outer shielding layer is provided on the outside of the heating layer.

[0066] Preferably, the vent connector nut described in step A1 is connected to the valve of the extraction system pipeline interface, and the connection is sealed with an oxygen-free copper washer.

[0067] More preferably, the outer diameter of the oxygen-free copper washer is ≤Φ22, and its shape is rhomboid.

[0068] More preferably, the sharp edges of the oxygen-free copper washer are deburred, and the surface roughness is ≤3.2.

[0069] Preferably, the gas connector nut described in step A2 is connected to the gas supply system pipeline interface valve, and the connection is sealed with an oxygen-free copper washer.

[0070] More preferably, the outer diameter of the oxygen-free copper washer is ≤Φ22, and its shape is rhomboid.

[0071] More preferably, the sharp edges of the oxygen-free copper washer are deburred, and the surface roughness is ≤3.2.

[0072] A method of using the above-mentioned radioactive gas extraction device with external irradiation shielding function includes the following steps: S1: Place the radioactive gas to be extracted into the casing; S2: Connect the vent connector nut to the extraction interface of the extraction system; S3: Turn on the heating layer to perform extraction.

[0073] Preferably, the method of using the radioactive gas extraction device with external irradiation shielding function includes the following steps: S1: Place the radioactive gas to be extracted into the casing; S2: Connect the vent connector nut to the extraction interface of the extraction system; S3: Turn on the heating layer to begin extraction; S4: Connect another device containing radioactive gas to be extracted to another extraction port of the extraction system using the same method; S5: Turn on the heating layer to begin extraction; S6: Repeat the above process to achieve continuous extraction of radioactive gas.

[0074] Compared with the prior art, the present invention has the following technical advantages: 1) This invention provides a radioactive extraction device with external irradiation shielding function. The external irradiation shielding function of this device is expected to realize the function of traditional extraction hot chamber and extraction furnace, and at the same time, it can create conditions for continuous extraction of radioactive gas.

[0075] 2) The radioactive gas extraction device of the present invention with external irradiation shielding function has both sealed extraction and external irradiation shielding functions, which can replace the traditional extraction hot chamber and extraction furnace, and is conducive to significantly reducing the cost of radioactive gas extraction facilities.

[0076] 3) This invention utilizes both the extraction container itself and the furnace shell of the extraction furnace to achieve external irradiation of radioactive gases.

[0077] 4) The radioactive gas extraction device of the present invention with external irradiation shielding function is only equipped with extractable material containing radioactive gas, which is beneficial to improving the extraction capacity of radioactive gas.

[0078] 5) The radioactive gas extraction device with external irradiation shielding function of the present invention can realize the continuous extraction of radioactive gas, which is beneficial to significantly improve the extraction capacity of radioactive gas.

[0079] 6) This invention provides a device that shields against X-rays and gamma rays and extracts radioactive gas from a radioactive gas cartridge by heating. This device has the advantages of shielding against X-rays and gamma rays and good heat transfer. Furthermore, by optimizing its usage method, continuous extraction of radioactive gas is achieved, ultimately realizing the goal of large-scale, low-cost extraction of radioactive gas. Attached Figure Description

[0080] Figure 1 This is a schematic diagram of the overall structure of a radioactive gas extraction device with external irradiation shielding function according to the present invention. Figure 2 This is a schematic diagram of the top structure of a radioactive gas extraction device with external irradiation shielding function according to the present invention; Figure 3 for Figure 1 AA section diagram; In the diagram: 1-Shell, 2-Gas connector nut, 3-Gas pipe, 4-Gas outlet connector, 5-Gas outlet connector nut, 6-Heating layer, 7-Outer shielding layer, 8-Distribution plate, 9-Shell bottom, 10-Lower flange, 11-Upper flange, 12-Filter head, 13-Bolt, 14-Sealing gasket, 15-Thermocouple socket, a-Radioactive gas to be extracted. Detailed Implementation

[0081] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0082] Example 1 A radioactive gas extraction device with external irradiation shielding function, such as Figure 1 As shown, it includes a housing 1, an air duct connector nut 2, an air duct 3, an air outlet connector 4, an air outlet connector nut 5, a heating layer 6, and an outer shielding layer 7.

[0083] The shell 1 contains a radioactive gas to be extracted.

[0084] The air connector nut 2 is connected to the air pipe 3, the air pipe 3 is connected to the housing 1, and the air connector nut 2 communicates with the inside of the housing 1 through the air pipe 3.

[0085] The vent nut 5 is connected to the vent connector 4, the vent connector 4 is connected to the top flange of the housing 1, and the vent nut 5 communicates with the inside of the housing 1 through the vent connector 4.

[0086] Furthermore, in this embodiment, a heating layer 6 for heating the housing 1 and an outer shielding layer 7 for shielding the housing 1 from external irradiation by the radioactive gas to be extracted a are sequentially provided on the outer side of the housing 1.

[0087] Example 2 A radioactive gas extraction device with external irradiation shielding function has a shell 1 that is a hollow cylindrical structure with openings at both the top and bottom. A lower flange 10 is welded to the top of the shell 1, a shell bottom 9 is welded to the bottom, and a distribution plate 8 is welded to the inside. The radioactive gas to be extracted, a, is placed on the distribution plate 8.

[0088] An opening is provided on the upper left side of the housing 1, which is welded to the air guide pipe 3. The air guide pipe 3 extends into the housing 1 and runs downward along the inner wall of the housing 1, and is finally welded to the distribution plate 8.

[0089] like Figure 2 As shown, the lower flange 10 is detachably connected to the upper flange 11 by multiple bolts 13, and the center hole of the upper flange 11 is welded to the air outlet connector 4. A filter head 12 is also provided at the bottom of the upper flange 11. The filter head 12 is located at the input end of the air outlet connector 4 and can filter the gas discharged through the air outlet connector 4.

[0090] like Figure 3 As shown, the device in this embodiment also includes a thermocouple socket 15 for detecting the heating temperature.

[0091] The rest is the same as in Example 1.

[0092] Example 3 A radioactive gas extraction device with external irradiation shielding function is composed of connector nuts (including gas inlet connector nut 2 and gas outlet connector nut 5), gas inlet pipe 3, long connector (gas outlet connector 4), bolt 13, upper flange 11, sealing gasket 14, lower flange 10, filter head 12, shell 1, radioactive gas to be extracted a, heating furnace (heating layer 6), distribution plate 8, outer shielding layer 7, shell bottom 9 and other components.

[0093] A radioactive gas extraction device with external irradiation shielding function, the connection relationship of each component is as follows: 1) The air duct connector nut 2 is connected to the upper left hole of the housing 1 by mating with the air duct 3; 2) The air guide tube 3 is welded to the upper opening of the housing 1 by welding after fitting the air guide connector nut 2; 3) The vent connector nut 5 is welded to the upper center hole of the upper flange 11 by fitting with the vent connector 4; 4) The vent connector 4 is connected to the upper flange 11 by welding after fitting the vent connector nut 5; 5) Bolt 13 is located in the flange holes of the upper flange 11 and the lower flange 10; 6) The upper flange 11 is located above the sealing gasket 14 and the lower flange 10; 7) The sealing gasket 14 is located between the upper flange 11 and the lower flange 10; 8) The lower flange 10 is connected to the upper flange 11 by bolts 13; 9) The filter head 12 is located at the bottom of the upper flange 11 and is connected by welding; 10) Radioactive gas to be extracted, a, accumulates inside the shell 1, on the upper part of the distribution plate 8; 11) The housing 1 is located below the lower flange 10 and is welded to the lower flange 10 by plasma arc welding; 12) The heating layer 6 is located outside the housing 1 and is connected by a split-type snap fastener; 13) The outer shielding layer 7 is located outside the heating layer 6; it is fixedly connected by a split-type snap fastener; 14) The distribution plate 8 is located 30mm above the bottom of the shell 1 and is connected by argon arc welding; 15) The bottom of the shell 9th ​​position is connected by plasma arc welding.

[0094] Example 4 A radioactive gas extraction device with external irradiation shielding function, in this embodiment: 1) Function of the vent connector nut 2: It mates with the vent pipe 3 using an outward-facing threaded connection, and connects to the system piping interface valves. An oxygen-free copper washer is used for sealing at the connection. Technical specifications are as follows: Material requirements: A. Q275 chrome-plated connector nut wall thickness ≥ 5mm; B. Joint sealing gasket material: oxygen-free copper TU2, outer diameter ≤ Φ22, shape requirement: rhombus.

[0095] Other requirements: A. Joint surface roughness ≤ 3.2; B. Joint sealing gasket: Sharp edges deburred, surface roughness ≤3.2.

[0096] 2) Function of the gas guide pipe 3: After mating with the gas guide connector nut 2, the gas guide pipe 3 is argon-arc welded to the opening on the upper part of the shell 1. The gas guide pipe 3 runs downward along the inner wall of the shell 1 and is welded to the center hole of the distribution plate 8. Technical specifications are as follows: Material requirements: Tungsten-nickel-iron alloy, preferred grade: 93W-4Ni-3F; Shape requirement: tubular; Size requirements: Φ10~14mm; wall thickness: 1.5~2.5mm; length: 320~350mm.

[0097] 3) Function of the vent connector nut 5: It mates with the vent connector 4 to connect to the center hole of the upper flange 11 via argon arc welding. When connecting to the system pipeline interface valve, an oxygen-free copper gasket is used for sealing at the connection. Technical specifications are as follows: Material requirements: Q275 chrome-plated connector nuts with a wall thickness ≥ 5mm; Other requirements: Before welding the vent connector 4 onto the upper flange 11, the nut thread should be facing upwards.

[0098] 4) Function of vent connector 4: It is connected to the upper flange 11 by welding, and connected to the system pipeline interface valve using the matching vent connector nut 5. The connection is sealed with an oxygen-free copper gasket. Technical specifications are as follows: Material requirements: A. Connector material: 316L stainless steel, 022Cr17Ni12Mo2; Outer diameter ≤ Φ22, length ≥ 50mm; B. Joint sealing gasket material: oxygen-free copper TU2, outer diameter ≤ Φ22, shape requirement: rhombus.

[0099] Other requirements: A. Joint surface roughness ≤ 3.2; B. Joint sealing gasket: Sharp edges deburred, surface roughness ≤3.2; C. When welding the joint, keep the joint perpendicular to the upper flange and use argon arc welding.

[0100] 5) The function of bolt 13: To connect and tighten the upper and lower flanges of the radioactive gas extraction device after loading, achieving a sealing effect by compressing the sealing gasket through the upper and lower flanges. Technical specifications are as follows: Material requirements: A. Bolt material: ≥ Carbon steel grade 8.8, M16~18 are all acceptable, length ≥ 70mm; B. Matching nut material: ≥ Carbon steel grade 8.8, M16~18 are all acceptable; C. Matching spring washer material: 65Mn.

[0101] 6) The function of the upper flange 11: to seal the radioactive gas extraction device after loading. Technical specifications are as follows: Material requirements: Tungsten-nickel-iron alloy, preferred grade: 93W-4Ni-3F; Size requirements: Φ100~500mm, thickness 10~50mm.

[0102] Other requirements: A. The surface roughness of the upper flange is ≤3.2; B. The cut surface of the sealing blade must be free from bumps and damage; C. When welding the joint, keep the joint perpendicular to the upper flange and use argon arc welding.

[0103] 7) Function of sealing gasket 14: It provides a seal by being tightened between the upper and lower flanges via bolts, thus compressing the flanges. Technical specifications are as follows: Material requirements: Sealing gasket material: Oxygen-free copper TU2; Size requirements: Φ90~490mm, thickness 6~8mm; Shape requirement: Circular.

[0104] Other requirements: A. Sealing gasket: Sharp edges deburred, surface roughness ≤3.2.

[0105] B. During assembly, place the deformed gasket in the center of the lower flange; it must not be reused.

[0106] 8) Function of the lower flange 10: It connects to the upper flange 11 and sealing gasket 14 via bolts 13 to achieve overall sealing of the device. It is connected to the shell 1 by plasma arc welding. Technical specifications are as follows: Material requirements: Tungsten-nickel-iron alloy, grade: 93W-4Ni-3F; Size requirements: Φ100~500mm, thickness 16~18mm.

[0107] 9) Function of filter head 12: Used to filter dust particles and impurities in the outlet gas, and connected to the upper flange 11 by argon arc welding; Material requirements: 316L stainless steel, 022Cr17Ni12Mo2; Size requirements: Φ50~60mm, height 50~60mm, filter pore size 5~10μm.

[0108] 10) The role of radioactive gas extract a: Material requirements: Solid components containing radioactive gases.

[0109] 11) Function of shell 1: The area for filling and heating the core block. Its material has the ability to shield X-rays and γ-rays and has good heat transfer effect, and completes the heat conduction during heating and cooling.

[0110] The technical specifications are as follows: Material requirements: Tungsten-nickel-iron alloy, preferred grade: 93W-4Ni-3F; Shape requirement: tubular; Size requirements: Φ30~450mm; wall thickness: 8~50mm; length: 100~1000mm; Other requirements: During assembly, it needs to be inserted into the corresponding hole at the bottom of the lower flange 10 and then welded by plasma arc welding.

[0111] 12) Function of heating layer 6: The temperature is controlled by a voltage circuit to heat the apparatus shell according to experimental needs. Heat is transferred through the side wall of the shell to the radioactive gas to be extracted, thus achieving the extraction of the radioactive gas. Technical specifications are as follows: Material requirements: A. Heating wire: Nikrothal40, nickel-chromium alloy, nickel content ≤35%, chromium content ≤20%; B. Electric furnace shell: tungsten-nickel-iron alloy, preferred grade: 93W-4Ni-3F; thickness: 8~50mm; C. Thermal insulation layer: aluminum silicate fiber; Size requirements: Inner diameter Φ50~500, height 200~1200mm.

[0112] 13) Function of outer shielding layer 7: It is made of materials that can shield X-rays and γ-rays to shield external irradiation from radioactive gas extract a.

[0113] Material requirements: Lead (Pd) or Tungsten (W); Shape requirement: Barrel-shaped; Size requirements: Φ350~450mm, thickness 50~100mm; height 350~400mm.

[0114] 14) Function of the distribution plate 8: Welded to the bottom of the shell 1 to support the radioactive gas to be extracted (a), it has pores to ensure uniform distribution of the gas introduced through the gas guide tube 3. Technical specifications are as follows: Material requirements: Tungsten-nickel-iron alloy, grade: 93W-4Ni-3F; Shape requirement: Circular; Size requirements: Φ80~400mm; thickness 3~5mm; center hole diameter: 10~12mm; air distribution hole diameter ≤6mm; quantity: evenly distributed.

[0115] 15) The function of the bottom of the casing 9: to achieve overall sealing of the device through plasma arc welding. Technical specifications are as follows: Material requirements: Tungsten-nickel-iron alloy, grade: 93W-4Ni-3F; Shape requirement: Circular.

[0116] Size requirements: Φ30~450mm; Thickness: 8~50mm.

[0117] Other requirements: During assembly, it must be aligned with the lower part of housing 1 and then welded using plasma arc welding.

[0118] 16) Function of thermocouple socket 15: to provide a temperature measurement channel for the temperature measuring element thermocouple.

[0119] The technical specifications are as follows: Material requirements: Ceramic insulating tube; Size requirements: Socket depth 70~150mm, inner diameter Φ8~16mm.

[0120] The method of using a radioactive gas extraction device with external irradiation shielding function is as follows: 1) The extract to be extracted (with other parts that do not contain radioactive gas removed) containing radioactive gas is loaded into the extraction device of this embodiment; 2) Connect the extraction device to the extraction interface of the extraction system; 3) Turn on the heating layer to perform extraction; 4) Connect another device to another extraction interface of the extraction system; 5) Turn on the heating layer to extract.

[0121] 6) Repeating the above process can achieve continuous extraction of radioactive gases.

[0122] The rest is the same as in Example 3.

[0123] Example 5 A radioactive gas extraction device with external irradiation shielding function is composed of connector nuts (including gas inlet connector nut 2 and gas outlet connector nut 5), gas inlet pipe 3, long connector (gas outlet connector 4), bolt 13, upper flange 11, sealing gasket 14, lower flange 10, filter head 12, radioactive gas to be extracted a, shell 1, heating furnace (heating layer 6), outer shielding layer 7, distribution plate 8, shell bottom 9 and other components.

[0124] A radioactive gas extraction device with external irradiation shielding function, the connection relationship of each component is as follows: 1) The tungsten-nickel-iron alloy gas pipe 3 is connected to the upper opening of the tungsten-nickel-iron alloy shell 1 by argon arc welding. 2) The Q275 chrome-plated gas connector nut 2 is connected to the tungsten nickel-iron alloy gas pipe 3 by argon arc welding through the opening in the tungsten nickel-iron alloy shell 1. 3) The Q275 chrome-plated vent connector nut 5 is connected to the 316L stainless steel upper flange 11 by argon arc welding after being matched with the 316L stainless steel vent connector 4. 4) The 316L stainless steel vent connector 4, after being fitted with the Q275 chrome-plated vent connector nut 5, is argon-arc welded to the 316L stainless steel upper flange 11. 5) Carbon steel grade 8.8 bolt 13 is located in the flange hole of 316L stainless steel upper flange 11 and tungsten nickel iron alloy lower flange 10; 6) The 316L stainless steel upper flange 11 is located above the oxygen-free copper TU2 sealing gasket 14 and the tungsten nickel iron alloy lower flange 10. 7) The oxygen-free copper TU2 sealing gasket 14 is located between the 316L stainless steel upper flange 11 and the tungsten nickel iron alloy lower flange 10. 8) The tungsten-nickel-iron alloy lower flange 10 is connected to the 316L stainless steel upper flange 11 by carbon steel grade 8.8 bolts 13; 9) The 316L stainless steel filter head 12 is located below the 316L stainless steel upper flange 11; 10) The radioactive gas to be extracted, a, is located inside the tungsten-nickel-iron alloy shell 1 and is irregularly stacked; 11) The tungsten-nickel-iron alloy shell 1 located below the tungsten-nickel-iron alloy lower flange 10 is welded by plasma arc welding; 12) The nickel-chromium alloy wire heating furnace is located outside the tungsten-nickel-iron alloy shell 1; 13) The lead / tungsten outer shielding layer 7 is located outside the nickel-chromium alloy wire heating furnace; 14) The tungsten-nickel-iron alloy distribution plate 8 is welded 20-30mm above the bottom of the tungsten-nickel-iron alloy shell bottom 9; 15) The bottom of the tungsten-nickel-iron alloy shell 9 is welded to the lower part of the tungsten-nickel-iron alloy shell 1 by plasma arc welding. 16) The ceramic thermocouple socket 15 is located in the middle of the side wall of the nickel-chromium alloy wire heating furnace.

[0125] The following is a method for manufacturing a radioactive gas extraction device with external irradiation shielding function: 1) Machining a 316L stainless steel bar or plate into an upper flange blank with an outer diameter of Φ220~240mm and a thickness of 16~18mm, and then machining it into a 316L stainless steel upper flange 11 with an outer diameter of Φ220~240mm, one eccentric hole and one center hole of Φ16~18mm, and a thickness of 16~18mm and a sealing platform with a 70° notch.

[0126] 2) Weld the 316L stainless steel vent connector 4 (50-70mm in length, 10-12mm in inner diameter, and 3-4mm in wall thickness) and its matching vent connector nut 5 vertically to both sides of the 316L stainless steel upper flange 11.

[0127] 3) Weld the tungsten-nickel-iron alloy gas pipe 3, with a length of 75~90mm, an inner diameter of 10~12mm, and a wall thickness of 3~4mm, to the opening on the upper part of the tungsten-nickel-iron alloy shell 1 with its matching gas connector nut 2.

[0128] 4) Machining a lower flange blank with an outer diameter of Φ220~240mm and a thickness of 16~18mm from tungsten nickel iron alloy bars or plates, and then machining it into a tungsten nickel iron alloy lower flange 10 with an outer diameter of Φ220~240mm, a center hole of Φ80~88mm, a thickness of 16~18mm and a sealing platform with a 70° notch.

[0129] 5) Cut the tungsten nickel-iron alloy pipe shell 1 with a diameter of 114~100mm into a length of 380~420mm and weld it to the tungsten nickel-iron alloy lower flange 10 by plasma arc welding.

[0130] 6) After processing the 3-5mm thick tungsten-nickel-iron alloy plate into a circular distribution plate 8 with a diameter of 100-80mm, weld it to the lower part of the gas guide pipe 3, and then weld it to the bottom of the tungsten-nickel-iron alloy shell 1 by plasma arc welding.

[0131] 7) Place the oxygen-free copper TU2 sealing gasket 14 in the center above the tungsten nickel iron alloy lower flange 10, and then place the 316L stainless steel upper flange 11 on top of the oxygen-free copper TU2 sealing gasket 14 with the joint facing upwards. Tighten the two upper and lower flanges symmetrically with 6 carbon steel grade 8.8 bolts 13.

[0132] 8) The tungsten-nickel-iron alloy plate with a thickness of 8~10mm is processed into a circular shell bottom 9 with a diameter of 114~100mm and welded to the bottom of the tungsten-nickel-iron alloy shell 1 by plasma arc welding.

[0133] 9) After connecting the DN10 stainless steel spring box valve to the 316L stainless steel gas outlet connector 4 and the gas guide pipe 3, connect it to the vacuum system for evacuation and leak detection, then purge with protective gas. Other pressures are controlled at atmospheric pressure +5~10KPa. Place it inside the horizontally placed nickel-chromium alloy wire heating electric furnace and fasten the furnace shell buckle.

[0134] 10) Install an outer shielding layer 7 on the outside of the nickel-chromium alloy wire heating furnace and fasten the outer shielding layer 7 clips.

[0135] The method of using a radioactive gas extraction device with external irradiation shielding function is as follows: 1) The extract to be extracted (with other parts that do not contain radioactive gas removed) containing radioactive gas is loaded into the extraction device of this embodiment; 2) Connect the extraction device to the extraction interface of the extraction system; 3) Turn on the heating furnace to extract the product; 4) Connect another device to another extraction interface of the extraction system; 5) Turn on the heating furnace to extract the product.

[0136] 6) Repeating the above process can achieve continuous extraction of radioactive gases.

[0137] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A radioactive gas extraction device with external irradiation shielding function, characterized in that, It includes a housing (1), an air duct connector nut (2), an air duct (3), an air outlet connector (4), an air outlet connector nut (5), a heating layer (6), and an outer shielding layer (7); The housing (1) contains radioactive gas to be extracted. The gas duct connector nut (2) is connected to the inside of the housing (1) through the gas duct pipe (3). The gas outlet connector nut (5) is connected to the inside of the housing (1) through the gas outlet connector (4). The outer side of the housing (1) is provided with a heating layer (6) and an outer shielding layer (7) in sequence.

2. The radioactive gas extraction device with external irradiation shielding function according to claim 1, characterized in that, A distribution plate (8) is provided inside the shell (1), and the radioactive gas to be extracted is placed on the distribution plate (8); The air guide tube (3) is connected to the upper side opening of the shell (1), and the air guide tube (3) runs downward along the inner wall of the shell (1) and is connected to the center hole of the distribution plate (8).

3. The radioactive gas extraction device with external irradiation shielding function according to claim 2, characterized in that, The distribution plate (8) is located 20-30 mm above the bottom of the shell (1); The bottom of the housing (1) is provided with a housing bottom (9).

4. The radioactive gas extraction device with external irradiation shielding function according to claim 1, characterized in that, The top of the housing (1) is connected to the lower flange (10), and the lower flange (10) is connected to the upper flange (11); The vent connector (4) is connected to the center hole at the top of the upper flange (11).

5. The radioactive gas extraction device with external irradiation shielding function according to claim 4, characterized in that, The bottom of the upper flange (11) is connected to a filter head (12); The filter head (12) is placed on the outside of the center hole at the bottom of the upper flange (11).

6. The radioactive gas extraction device with external irradiation shielding function according to claim 4, characterized in that, The lower flange (10) and the upper flange (11) are connected by bolts (13) in the flange holes; A sealing gasket (14) is provided between the lower flange (10) and the upper flange (11).

7. The radioactive gas extraction device with external irradiation shielding function according to claim 1, characterized in that, The heating layer (6) is a heating electric furnace, which is connected by a split buckle.

8. The radioactive gas extraction device with external irradiation shielding function according to claim 1, characterized in that, The outer shielding layer (7) contains a material that can shield X-rays and γ-rays; The outer shielding layer (7) is located outside the heating layer (6) and is connected by a split snap fastener.

9. A method for manufacturing a radioactive gas extraction device with external irradiation shielding function as described in any one of claims 1 to 8, characterized in that, Includes the following steps: A1: Connect the vent connector nut (5) to the vent connector (4) with the threaded upwards. The vent connector (4) is welded to the center hole of the top flange of the housing (1). A2: Connect the vent connector nut (2) to the vent pipe (3) with the thread facing outwards. The vent pipe (3) is welded to the side wall opening of the housing (1) and extends into the housing (1). A3: A heating layer (6) and an outer shielding layer (7) are sequentially arranged on the outside of the shell (1).

10. A method of using a radioactive gas extraction device with external irradiation shielding function as described in any one of claims 1 to 8, characterized in that, Includes the following steps: S1: Place the radioactive gas to be extracted into the casing (1); S2: Connect the vent connector nut (5) to the extraction interface of the extraction system; S3: Turn on the heating layer (6) to perform extraction.

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