CN109686463B - Movable remote freezing overhaul device - Google Patents
Movable remote freezing overhaul device Download PDFInfo
- Publication number
- CN109686463B CN109686463B CN201811441011.8A CN201811441011A CN109686463B CN 109686463 B CN109686463 B CN 109686463B CN 201811441011 A CN201811441011 A CN 201811441011A CN 109686463 B CN109686463 B CN 109686463B
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- China
- Prior art keywords
- liquid nitrogen
- freezing
- freezing tank
- pipeline
- service unit
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/017—Inspection or maintenance of pipe-lines or tubes in nuclear installations
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C15/00—Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants
- G21C15/02—Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices
- G21C15/14—Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices from headers; from joints in ducts
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Pipe Accessories (AREA)
- Measurement Of Radiation (AREA)
Abstract
The invention relates to the technical field of radioactive environment maintenance, and particularly discloses a mobile remote freezing maintenance device which comprises a freezing tank, an exhaust pipe arranged at the top end of the freezing tank and a liquid nitrogen guide pipe connected with the side wall of the freezing tank. The device provided by the invention is corrosion-resistant, free of deformation during freezing, free of embrittlement, light in weight, convenient for remote operation of maintainers, capable of reducing the irradiated dose of the maintainers to the maximum extent, simple to operate, convenient to use and capable of meeting the requirement of remote maintenance in high-radioactivity places.
Description
Technical Field
The invention belongs to the technical field of radioactive environment maintenance, and particularly relates to a movable remote freezing maintenance device.
Background
The process pipeline maintenance under the high radioactivity environment mainly has two kinds of modes at present: 1. cleaning and decontaminating a process system, carrying out on-site detection, leading maintenance personnel to wear protective working clothes, maintenance gas clothes and the like after the radioactive dosage is at least less than 200uSv/h to meet the safety requirement, entering an equipment room with radioactivity, cutting and blocking process pipelines, welding after replacing pipelines with the same specification and material, finishing the maintenance after the flaw detection is qualified, and treating the cut process pipelines, the protective clothes and the like according to radioactive garbage. 2. After the process pipeline is blocked, a maintainer introduces a pressure air blowing mode, a steam blowing mode or an acid soaking mode to dredge through the outdoor process pipeline of the equipment, however, if the process pipeline is blocked seriously in a high-radioactivity environment, the process pipeline is difficult to dredge through the acid soaking mode, the 6Kg pressure air blowing mode, the 8Kg steam blowing mode and the like.
After the process pipeline in the high-radioactivity environment is blocked, the process pipeline in the equipment room is mostly a tee joint or a four-way joint and is communicated with a plurality of equipment storage tanks, and the maintenance valve is not installed in the equipment room, so that the pressure in the process pipeline cannot be held, and the blocked pipeline cannot be dredged in conventional modes such as air pressure and steam. In addition, the radioactive dose of the hanging test in the field equipment room is more than 3000mSv/h, the dose of the blocking position of the process pipeline is higher, the safe overhaul condition is not provided, and the overhaul personnel can not enter the equipment room for overhaul, so the existing overhaul mode is difficult to implement.
And the process pipeline in the high-radioactivity environment is blocked, and the blocked pipeline cannot be dredged in time, so that a process system is stopped, and the facility of the whole process system is directly stopped. Therefore, the maintenance device which can be moved and operated remotely needs to be developed in combination with the actual situation on site, and the operation safety of the maintenance personnel is met.
Disclosure of Invention
The invention aims to provide a movable remote freezing and overhauling device which can obviously reduce the irradiation dose of an overhauling person.
The technical scheme of the invention is as follows:
the mobile remote freezing and overhauling device is used for freezing and overhauling blocked high-radioactivity pipelines and comprises a freezing tank, an exhaust pipe and a liquid nitrogen guide pipe;
the freezing tank is used for containing liquid nitrogen, an inwards concave clamping opening is processed on the freezing tank, and a high-radioactivity pipeline to be overhauled can be clamped in the clamping opening and is tightly attached to the freezing tank;
the liquid nitrogen outlet end of the liquid nitrogen guide pipe penetrates through the side wall of the freezing tank to be communicated with the interior of the freezing tank, and the liquid nitrogen inlet end is positioned in the safe operation area and can guide liquid nitrogen into the freezing tank;
the liquid nitrogen guide pipe is a hard pipe and has strength, and an operator can clamp the freezing tank at the position of a high-radioactivity pipeline to be overhauled in a long distance by holding the liquid nitrogen inlet end of the liquid nitrogen guide pipe;
the exhaust pipe is arranged at the top end of the freezing tank, the opening of the exhaust pipe is vertically upward, and the exhaust pipe is used for exhausting gas in the freezing tank when liquid nitrogen is added, so that the liquid nitrogen is conveniently added.
The high-radioactivity pipeline to be overhauled is clamped in the clamping opening through friction force.
The high-activity pipeline to be overhauled is a pipeline arranged at any angle.
The liquid nitrogen guide pipe and the freezing tank are connected, and the positions of the liquid nitrogen guide pipe and the inner concave position of the clamping opening are respectively positioned on two opposite sides of the freezing tank.
And judging whether the freezing tank is filled with liquid nitrogen or not by observing whether the liquid nitrogen emerges from the exhaust pipe or not.
The size of the clamping opening is matched with the diameter of a high-radioactivity pipeline to be overhauled.
The length of the liquid nitrogen guide pipe is determined according to the distance between the freezing position and the safe operation area.
The freezing jar be cavity cylinder structure, the upper surface of freezing jar is located to the blast pipe, the trend of putting the mouth in the card is parallel with the axis of freezing jar.
The freezing tank, the liquid nitrogen guide pipe and the exhaust pipe are all made of stainless steel.
The wall thickness of the freezing tank is 1mm, the diameter is 200mm, and the height is 260 mm; the size of the liquid nitrogen draft tube is phi 25 multiplied by 3 mm; the size of the exhaust pipe is phi 8 multiplied by 2 mm.
The invention has the following remarkable effects:
(1) the device provided by the invention is corrosion-resistant, free of deformation during freezing, free of embrittlement, light in weight, convenient for remote operation of maintainers, capable of reducing the irradiated dose of the maintainers to the maximum extent, controllable in irradiated dose, simple to operate, convenient to use and capable of meeting the requirement of remote maintenance in high-radioactivity places.
(2) The device is adopted for pipeline maintenance, the cleaning and decontamination of the process system are not needed to be carried out for a long time before the maintenance, the radioactive waste liquid generated by the cleaning and decontamination is not needed to be treated, and the cost of the process system for cleaning and decontaminating power energy, manpower and the like is not generated; in the maintenance process, the required time is short, and the process system does not need to be stopped for a long time; meanwhile, the radioactive garbage generated by personnel overhaul and the radioactive pollution of the site environment can be avoided.
(3) The device provided by the invention is used for overhauling the blocked process pipeline, overcomes the defect that the existing overhauling mode cannot be used for overhauling in a high-radioactivity environment, and avoids the possibility of shutdown of process system facilities.
(4) The device has good dredging effect on the blocked process pipeline and can ensure production.
Drawings
Fig. 1 is a schematic structural diagram of a mobile remote freezing and overhauling device.
In the figure: firstly, clamping a placing port; secondly, exhausting the pipe; ③ freezing the tank; and fourthly, a liquid nitrogen flow guide pipe.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
The mobile remote freezing and overhauling device shown in figure 1 can be used for freezing and overhauling blocked high-radioactivity pipelines and comprises a freezing tank 3, an exhaust pipe 2 and a liquid nitrogen guide pipe 4.
Freezing jar 3 be used for the splendid attire liquid nitrogen freezing jar 3 on process the card of indent put mouthful 1, the card is put mouthful 1 trend and is parallel with freezing jar 3 axis, the high radioactivity pipeline that waits to overhaul can establish through the frictional force card the card put mouthful 1 in, closely laminate with freezing jar 3, ensure that medium is frozen in the shortest time in the pipeline. The size of the clamping opening 1 is matched with the diameter of a high-radioactivity pipeline to be overhauled. The high activity pipeline to be overhauled can be a pipeline arranged at any angle, such as a vertical arrangement, a horizontal arrangement or an oblique arrangement. In the embodiment, the freezing cylinder 3 is a hollow cylinder structure, is made of a stainless steel plate with the diameter of 1mm, and has the diameter of 200mm and the height of 260 mm.
The liquid nitrogen outlet end of the liquid nitrogen guide pipe 4 penetrates through the side wall of the freezing tank 3 to be communicated with the inside of the freezing tank 3, the liquid nitrogen inlet end is located in the safe operation area, the length of the liquid nitrogen guide pipe 4 is determined according to the distance between the freezing position and the safe operation area, and the liquid nitrogen can be guided to the freezing tank 3. Liquid nitrogen honeycomb duct 4 be the hard tube, have intensity, operating personnel can be remote with freezing jar 3 card in the high radioactivity pipeline position of waiting to overhaul through handheld liquid nitrogen entry end of liquid nitrogen honeycomb duct 4. The position where the liquid nitrogen guide pipe 4 is connected with the freezing tank 3 is opposite to the concave position of the clamping opening 1 and is respectively positioned at two sides of the freezing tank 3. In the examples, the liquid nitrogen guide tube 4 is a stainless steel tube having a diameter of 25X 3 mm.
Blast pipe 2 locate the top of freezing jar 3, the opening is vertical upwards for gaseous discharge in freezing jar 3 when the liquid nitrogen adds, the liquid nitrogen of being convenient for adds, whether the accessible is observed blast pipe 2 department simultaneously and is had the liquid nitrogen to emerge and judge whether the liquid nitrogen has been full of freezing jar 3. In the embodiment, the exhaust pipe 2 is provided on the upper surface of the freezing cylinder 3 and has a size of 8 mm by 2 mm.
Claims (10)
1. Portable remote refrigeration overhauls device for the refrigeration of high radioactivity pipeline jam is overhauld, its characterized in that: comprises a freezing tank (3), an exhaust pipe (2) and a liquid nitrogen guide pipe (4);
the freezing tank (3) is used for containing liquid nitrogen, an inwards concave clamping opening (1) is processed on the freezing tank (3), and a high-radioactivity pipeline to be overhauled can be clamped in the clamping opening (1) and tightly attached to the freezing tank (3);
the liquid nitrogen outlet end of the liquid nitrogen guide pipe (4) penetrates through the side wall of the freezing tank (3) to be communicated with the inside of the freezing tank (3), and the liquid nitrogen inlet end is positioned in the safe operation area and can guide liquid nitrogen into the freezing tank (3);
the liquid nitrogen guide pipe (4) is a hard pipe and has strength, and an operator can clamp the freezing tank (3) at the position of a high-radioactivity pipeline to be overhauled in a long distance by holding the liquid nitrogen inlet end of the liquid nitrogen guide pipe (4);
exhaust pipe (2) locate the top of freezing jar (3), the opening is vertical upwards for gaseous discharge in freezing jar (3) when liquid nitrogen adds, the liquid nitrogen of being convenient for adds.
2. A mobile remote freezer service unit as defined in claim 1 wherein: the high-radioactivity pipeline to be overhauled is clamped in the clamping opening (1) through friction force.
3. A mobile remote freezer service unit as defined in claim 2 wherein: the high-activity pipeline to be overhauled is a pipeline arranged at any angle.
4. A mobile remote freezer service unit as defined in claim 3 wherein: the liquid nitrogen guide pipe (4) is connected with the freezing tank (3) and the concave position of the clamping opening (1) are respectively positioned at two opposite sides of the freezing tank (3).
5. A mobile remote freezer service unit as defined in claim 4 wherein: and judging whether the freezing tank (3) is filled with liquid nitrogen by observing whether the liquid nitrogen emerges from the exhaust pipe (2).
6. A mobile remote freezer service unit as defined in claim 5 wherein: the size of the clamping opening (1) is matched with the diameter of a high-radioactivity pipeline to be overhauled.
7. A mobile remote freezer service unit as defined in claim 6 wherein: the length of the liquid nitrogen guide pipe (4) is determined according to the distance between the freezing position and the safe operation area.
8. A mobile remote freezer service unit as defined in claim 7 wherein: freezing jar (3) be cavity cylinder structure, the upper surface of freezing jar (3) is located in blast pipe (2), the trend of putting mouth (1) in the card is parallel with the axis of freezing jar (3).
9. A mobile remote freezer service unit as defined in claim 8 wherein: the freezing tank (3), the liquid nitrogen guide pipe (4) and the exhaust pipe (2) are all made of stainless steel.
10. A mobile remote freezer service unit as defined in claim 9 wherein: the wall thickness of the freezing tank (3) is 1mm, the diameter is 200mm, and the height is 260 mm; the liquid nitrogen draft tube (4) has the size of phi 25 multiplied by 3 mm; the size of the exhaust pipe (2) is phi 8 multiplied by 2 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811441011.8A CN109686463B (en) | 2018-11-29 | 2018-11-29 | Movable remote freezing overhaul device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811441011.8A CN109686463B (en) | 2018-11-29 | 2018-11-29 | Movable remote freezing overhaul device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109686463A CN109686463A (en) | 2019-04-26 |
| CN109686463B true CN109686463B (en) | 2022-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811441011.8A Active CN109686463B (en) | 2018-11-29 | 2018-11-29 | Movable remote freezing overhaul device |
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| CN (1) | CN109686463B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103811083B (en) * | 2012-11-14 | 2017-06-20 | 中国广核集团有限公司 | Nuclear plant safety injected system and clear up its injection pipeline method for cleaning |
| CN205104243U (en) * | 2015-11-10 | 2016-03-23 | 大亚湾核电运营管理有限责任公司 | Stifled isolation structure of online ice of nuclear power station pipeline |
| CN106098129A (en) * | 2016-06-14 | 2016-11-09 | 中广核工程有限公司 | The portable online radioactive decontamination system of nuclear power station |
| CN107622805A (en) * | 2017-08-29 | 2018-01-23 | 中核四0四有限公司 | MOX device maintenance methods |
| JP3214053U (en) * | 2017-10-05 | 2017-12-14 | 株式会社東洋ユニオン | Equipment for stripping and removing radioactive contamination layers |
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- 2018-11-29 CN CN201811441011.8A patent/CN109686463B/en active Active
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| CN109686463A (en) | 2019-04-26 |
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