CN110706831A - Bottom heat preservation and insulation device and method for primary circuit voltage stabilizer of nuclear power plant - Google Patents
Bottom heat preservation and insulation device and method for primary circuit voltage stabilizer of nuclear power plant Download PDFInfo
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- CN110706831A CN110706831A CN201911112326.2A CN201911112326A CN110706831A CN 110706831 A CN110706831 A CN 110706831A CN 201911112326 A CN201911112326 A CN 201911112326A CN 110706831 A CN110706831 A CN 110706831A
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- 238000004321 preservation Methods 0.000 title claims abstract description 78
- 239000003381 stabilizer Substances 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000010276 construction Methods 0.000 claims abstract description 18
- 238000009434 installation Methods 0.000 claims abstract description 14
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- 239000010410 layer Substances 0.000 claims description 38
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- 238000004088 simulation Methods 0.000 claims description 6
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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
- G21C15/20—Partitions or thermal insulation between fuel channel and moderator
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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
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- 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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Abstract
The invention belongs to the field of nuclear power plant machinery, and particularly relates to a bottom heat preservation and insulation device and method for a primary circuit voltage stabilizer of a nuclear power plant. The original heat-insulating layer of the nuclear power plant has the problems of complex installation, incapability of being reused, serious dust pulverization phenomenon and insufficient firmness in fixation. The device comprises a supporting structure, a heat insulation structure and a locking structure. The method comprises the following steps: the method comprises the following steps: confirming the prerequisite; step two: site construction conditions; step three: the bottom of the voltage stabilizer is removed after heat preservation; step four: collecting related data of the voltage stabilizer and prefabricating a new heat insulation structure; step five: the bottom of the voltage stabilizer is installed in a heat preservation way; step six: and (5) heat preservation optimization acceptance. The thermal insulation layer at the bottom of the voltage stabilizer implemented by the improved scheme has the advantages of good thermal insulation effect, repeated use, long service life, easy disassembly and convenient maintenance, greatly shortens the maintenance and construction time of a nuclear power plant, and improves the economic benefit of the nuclear power plant.
Description
Technical Field
The invention belongs to the field of nuclear power plant machinery, and particularly relates to a bottom heat preservation and insulation device and method for a primary circuit voltage stabilizer of a nuclear power plant.
Background
The electric heater elements at the bottoms of the voltage stabilizers of two units in a certain nuclear power plant have the defect of damage failure, and the reason of project group analysis is that the original heat insulation layer is complicated in field installation process, consumes long time, is easy to generate gaps after installation, is easy to loose after running for a period of time, has high requirements on installers, leads to the situation that the heat insulation structure at the bottom of the voltage stabilizer is not tightly installed in the capital construction period, and the electric heater elements are directly baked by a system medium at high temperature to be damaged.
The heat preservation layer at the bottom of the voltage stabilizer in the nuclear island plant is used for performing a heat preservation function on the voltage stabilizer equipment body during the operation of a reactor, so that the economical efficiency of the operation of the reactor is reduced due to the heat loss, and the environmental temperature of a system equipment plant is also reduced. The original heat preservation preparation installation has following problem: (1) the field installation is complex and the disassembly and the assembly are inconvenient; (2) because the equipment can generate certain vibration when running, the heat-insulating material can generate pulverization phenomenon under the condition of continuous high temperature, and a large amount of dust can be generated when the equipment is assembled and disassembled in the common heat-insulating way, thereby influencing the health of constructors; (3) the heat insulating material is not beneficial to recycling and increases nuclear waste; (4) the fixation is not firm enough, and large gaps are easy to generate between layers, so that the heat preservation and insulation effects are lost. The improvement aims at the defects, the on-site disassembly and assembly can be more quickly realized, the fixation is more stable, the heat-preservation layers are tight and seamless, the gap is not easy to generate after long-term operation, and the heat-insulation effect is more ensured.
Disclosure of Invention
1. Purpose(s) to
The thermal insulation structure at the bottom of the voltage stabilizer is optimized, so that the thermal insulation structure and the insulated object are tightly and completely installed in a thermal insulation way.
2. Technical scheme
A bottom thermal insulation device for a loop voltage stabilizer in a nuclear power plant comprises: supporting structure, insulation construction, locking structure. In the heat insulation structure, a filler pipe head heat insulation block, an inner ring heat insulation block, a middle 1 ring heat insulation block, a middle 2 environment-friendly heat insulation block, an outer ring heat insulation block, a first layer of soft detachable heat insulation and a second layer of soft detachable heat insulation are sequentially connected along the outward direction of the circle center; a pore for a heater element connecting pipe to pass through is reserved between the heat insulation blocks of the heat insulation structure; the supporting structure integrally covers the outer surface of the heat insulation structure.
The supporting structure comprises a keel supporting seat, a keel steel belt, a steel belt fixing ring and a keel supporting belt; the keel supporting seat is supported on the periphery of the whole device, and the keel steel band stainless steel band supporting support is fixed on the periphery of the first layer of soft detachable heat preservation and the second layer of soft detachable heat preservation.
The locking structure comprises a magic tape overlapping edge and a magic tape locking belt; the heat preservation blocks are connected through magic tape overlapping edges, and the keel steel belt and the heat preservation blocks are fixedly connected through magic tape locking belts.
The heat insulation structure adopts a single-layer or multi-layer detachable blanket type heat insulation, the seam heat insulation blankets are overlapped by 45-60-degree inclined seams, and the single weight of the heat insulation block is less than or equal to 30 kg.
A bottom heat preservation and insulation method for a loop voltage stabilizer of a nuclear power plant is characterized by comprising the following steps: the method comprises the following steps: the method comprises the following steps: confirming the prerequisite; step two: site construction conditions; step three: the bottom of the voltage stabilizer is removed after heat preservation; step four: collecting related data of the voltage stabilizer and prefabricating a new heat insulation structure; step five: the bottom of the voltage stabilizer is installed in a heat preservation way; step six: and (5) heat preservation optimization acceptance.
The method comprises the following steps: the prerequisite confirmation specifically includes: 1. before entering the region at the bottom of the voltage stabilizer, the radiation protection personnel must be queried and the access is permitted after the personnel; 2. confirming that the scaffold erection conditions are met; 3. the field illumination meets the construction requirements; 4. and processing the operation application of the radiation control area.
Step two: the field construction conditions specifically comprise: 1. confirming that the bottom area of the voltage stabilizer can enter and the environmental dosage rate can be accepted; 2. erecting a scaffold on site, and maintaining electric personnel and heat preservation personnel to perform on-site monitoring work; 3. confirming that the scaffold erection is finished and acceptance is qualified; 4. confirming that the construction isolation area is established; 5. electrical maintenance personnel must track and monitor throughout the insulation removal and reinstallation process to ensure that the surrounding electrical heater elements are not damaged by the insulation/scaffolding operation.
The third step is that: the stabiliser bottom keeps warm and demolishs, specifically includes: 1. the working object can be confirmed on site together with the maintenance electric guardian, the scaffold is confirmed to be qualified for acceptance, and an acceptance qualified plate is hung; 2. removing about 3M straight pipe sections of a vertical part of a fluctuation pipe at the bottom of a lower end socket of the voltage stabilizer; 3. a fixing frame made of flat steel and used for fixing a lower end socket heat insulation cotton pad of the voltage stabilizer is removed, and the fixing frame is of a quick-opening structure and is connected by bolts; 4. and gradually removing the original heat insulation structure of the lower end socket of the voltage stabilizer from inside to outside until the original heat insulation structure is completely removed.
The fourth step is that: the relevant data acquisition of stabiliser and insulation construction are prefabricated, specifically include: 1. actually measuring data required by heat preservation at the bottom of the voltage stabilizer on site; 2. determining the thicknesses of the heat insulation structures in different areas and corresponding heat insulation structures according to the field measured data; 3. and prefabricating a simulation body in a shape of 1:1 according to a drawing and field actual measurement data, and prefabricating a heat insulation structure on the simulation body.
Step five: stabiliser bottom heat preservation installation specifically includes: 1. checking and confirming that the number, the thickness, the relevant sizes and the like of the heat preservation blocks are completely correct and carrying the heat preservation blocks to the position of a specified area; 2. the heat preservation blocks are gradually installed from outside to inside, and a first layer of soft detachable heat preservation and a second layer of soft detachable heat preservation in the peripheral area of the periphery of the outermost ring electric heater are installed firstly; secondly, an outer ring heat insulation block, a middle 2 environment-friendly heat insulation block, a middle 1 ring heat insulation block, an inner ring heat insulation block and a filler neck heat insulation block are gradually installed to the inner ring; 3. all gaps are tightly filled by small cotton pads; 4. the installation and the positioning of the heat insulation structure are completed, the fixing frame made of flat steel is firstly used for positioning, and then the secondary fixing of the heat insulation structure is completed by adopting the glass fiber cloth strips.
Step six: the heat preservation optimization acceptance specifically comprises: 1. the installation and the positioning of the heat insulation structure are completed, and all seams are tight and have no clearance; 2. the new heat insulation structure is installed and positioned to finish the heat radiation sheet of the electric heater of the voltage stabilizer, the outer surface of which is not allowed to be shielded and covered.
3. The effect is as follows:
the improved scheme is applied and verified in two units of a certain nuclear power plant in China: the heat preservation thickness is 130-200 mm, the heat preservation layer is wrapped by high-temperature resistant alkali-free glass fiber cloth and is lapped by metal thread gluing between heat preservation blocks, the detachable heat preservation layer supported by a stainless steel band is adopted outside, appearance inspection is carried out after about 18 months of operation period, the heat preservation block is complete and has no crack, compared with the installation state, the state is almost unchanged, the condition of the electric heater element of the voltage stabilizer is good, and the phenomenon that more faults are caused by the original heat preservation installation method can not occur.
The thermal insulation layer at the bottom of the voltage stabilizer implemented by the improved scheme has the advantages of good thermal insulation effect, repeated use, long service life, easy disassembly and convenient maintenance, greatly shortens the maintenance and construction time of a nuclear power plant, and improves the economic benefit of the nuclear power plant.
Drawings
FIG. 1 is a side sectional view of a bottom insulation fabrication structure of a voltage regulator;
FIG. 2 is a bottom view of the bottom insulation fabrication structure of the voltage stabilizer;
FIG. 3 is a layout view of the first layer of insulating layer of the inner ring;
FIG. 4 is a layout view of the inner ring second layer of insulation;
FIG. 5 is a layout diagram of the middle 1 ring first insulating layer;
FIG. 6 is a layout diagram of a middle 1 ring second insulating layer;
FIG. 7 is a layout view of the middle 2 ring first insulating layer;
FIG. 8 is a layout view of the middle 2 ring second insulation layer;
FIG. 9 is a view of the arrangement of the first layer of insulation of the outer ring;
FIG. 10 is a view of the arrangement of the second layer of insulation of the outer ring;
FIG. 11 is a schematic view of a metallic hook and loop arrangement;
in the figure: 1. a keel supporting seat; 2. a keel steel band; 3. a steel belt fixing ring; 4. the first layer of soft detachable heat preservation; 5. the second layer of soft detachable heat preservation; 6. a heater element take-over; 7. a filler neck heat preservation block; 8. an inner ring heat preservation block; 9. a middle 1 ring heat preservation block; 10. middle 2, environmental protection temperature block; 11. an outer ring heat-insulating block; 12. a keel support band; 13. magic tape lap joint edges; 14. magic tape locking belt.
Detailed Description
The following detailed description of the patent refers to the accompanying drawings and specific embodiments:
the invention is mainly designed by adopting the following technology:
1) the heat preservation structure is designed to be fully detachable for heat preservation. The heat insulation structure is convenient for in-service maintenance of the bottom of the voltage stabilizer, can be repeatedly used and can be conveniently and quickly disassembled and assembled. The schematic diagram of the structure of the bottom heat preservation manufacturing of the voltage stabilizer is shown in fig. 1 and fig. 2. The arrangement of the heat-insulating layers of the inner ring, the middle ring and the outer ring is shown in figures 3-10.
2) As shown in fig. 3-10, the seams overlap. The single-layer/multi-layer detachable blanket type heat preservation is adopted, the seam heat preservation blanket is designed into the inclined seam lap joint of 45-60 degrees as far as possible, the unallowed air gap is avoided, and the heat loss is prevented.
3) As shown in fig. 9 and 10, the heat insulation with a large overall coverage area is prefabricated according to the field size. The weight of the single heat-insulating block is not more than 30 kg. The quick assembly and disassembly on site are facilitated, and the splicing seams are reduced.
4) As shown in fig. 1 and 2, the outer surface of the keel supporting device is made of stainless steel strips, and the keel supporting device comprises a keel supporting seat 1, a keel steel strip 2, a steel strip fixing ring 3 and a keel supporting band 12. In order to prevent the soft heat-insulating layer from sagging due to dead weight, the bottom heat-insulating layer adopts the magic tape overlapping edge 13 and the magic tape locking belt 14. After the lapping and fixing, the outer surface is supported and fixed by a stainless steel band, and the arrangement of the stainless steel band is comprehensively considered according to the position of the electric heater element of the voltage stabilizer. See fig. 1 and 2.
5) As shown in fig. 11, the heat preservation blocks are connected by a magic tape overlapping edge 13. Magic subsides overlap edge 13 is arranged the figure and is shown in figure 11, uses magic subsides overlap edge 13 to ensure that the contact is inseparable not pine takes off, the gap does not appear between the heat preservation piece, satisfies long-term operation demand, the quick assembly disassembly of also being convenient for.
The specific implementation steps are explained by taking the implementation process of a certain domestic nuclear power station as an example:
1. prerequisite confirmation
1.1 before entering the region at the base of the pressurizer, the radiation protection personnel must be queried and access must be granted from the rear.
1.2 confirmation of scaffold erection conditions.
1.3 the field illumination meets the construction requirements.
1.4, the operation application of the radiation control area is processed.
2. Conditions of site operation
2.1 confirm that the bottom region of the potentiostat is accessible and that the ambient dose rate is acceptable.
2.2 the scaffold is set up on site (attention to protection measures), and the maintenance personnel and the heat preservation personnel do the site monitoring work.
And 2.3, confirming that the scaffold erection is finished and the scaffold is qualified through acceptance.
2.4 confirming that the construction isolation area is established.
2.5 the electrical maintenance personnel must follow the entire process to ensure that the peripheral electric heater elements are not damaged by the operation of the insulation/scaffold during the insulation removal and reinstallation process.
3. Heat preservation dismantling step for bottom of voltage stabilizer
3.1, the working object is confirmed on site together with the maintenance electric guardian, the scaffold is confirmed to be qualified for acceptance, and an acceptance board is hung.
3.2 remove stabiliser bottom surge pipe vertical part about 3M straight tube sections.
3.3 remove the mount that adopts the band steel to make of fixed stabilizer lower head heat preservation cotton pad, the mount is quick-open structure and adopts bolted connection (if the bolt corrosion uses the loosening agent to soak).
And 3.4, gradually removing the original heat insulation structure of the lower end socket of the voltage stabilizer from inside to outside until the removal is completed.
4. Voltage stabilizer related data acquisition and new heat insulation structure prefabrication
4.1 the required relevant data of field measurement stabiliser bottom heat preservation, if: the heat preservation thickness and the size of the distance between the welding seam of each electric heater element and the sleeve pipe of the electric heater element and the lower surface of the end socket; the relative spacing between the electric heater elements, etc.
And 4.2, determining the thicknesses of the heat insulation structures in different areas and corresponding heat insulation structures according to the field measured data.
4.3 according to the drawings shown in fig. 1-11, prefabricating a simulation body in a 1:1 shape according to drawings and field actual measurement data, and prefabricating a heat insulation structure on the simulation body.
5. Thermal insulation mounting step for bottom of voltage stabilizer
5.1 checking to confirm that the number, thickness and relevant sizes of the heat preservation structures are completely correct and carrying the heat preservation structures to the position of the appointed area.
5.2, mounting heat preservation blocks step by step from outside to inside, and firstly mounting a first layer of soft detachable heat preservation 4 and a second layer of soft detachable heat preservation 5 in the peripheral area of the periphery of the outermost ring electric heater; secondly, an outer ring heat insulation block 11, a middle 2 ring heat insulation block 10, a middle 1 ring heat insulation block 9, an inner ring heat insulation block 8 and a filler neck heat insulation block 7 are gradually installed towards the inner ring; all gaps are tightly filled by small cotton pads
5.3 all gaps are tightly filled by small cotton pads.
5.4 the thermal insulation structure is installed and positioned, the fixing frame made of flat steel is firstly used for positioning, and then the glass fiber cloth strip is used for fixing the thermal insulation structure completely for the second time.
6. Heat preservation optimization completion acceptance
6.1 the installation and positioning of the heat-insulating structure are completed, and all seams are tight and have no clearance
6.2 the installation and positioning of the heat preservation structure are completed, the outer surface of the heat preservation structure is not allowed to be shielded, and the heat dissipation sheet of the electric heater of the voltage stabilizer is covered, and a distance of 10-50 mm is recommended to be reserved.
Claims (10)
1. A bottom thermal insulation device for a loop voltage stabilizer in a nuclear power plant comprises: bearing structure, insulation construction, locking structure, its characterized in that: in the heat insulation structure, a filler pipe head heat insulation block (7), an inner ring heat insulation block (8), a middle 1 ring heat insulation block (9), a middle 2 ring heat insulation block (10), an outer ring heat insulation block (11), a first layer of soft detachable heat insulation (4) and a second layer of soft detachable heat insulation (5) are sequentially connected along the outward direction of the circle center; a pore through which the heater element connecting pipe (6) passes is reserved between the heat preservation blocks; the supporting structure integrally covers the outer surface of the heat insulation structure.
2. The bottom thermal insulation device for the nuclear power plant primary loop voltage stabilizer as claimed in claim 1, wherein: the supporting structure comprises a keel supporting seat (1), a keel steel belt (2), a steel belt fixing ring (3) and a keel supporting belt (12); the keel supporting seat (1) is supported on the periphery of the whole device, and the keel steel band (2) and the stainless steel band are supported and fixed on the periphery of the first layer of soft detachable heat preservation (4) and the second layer of soft detachable heat preservation (5).
3. The bottom thermal insulation device for the nuclear power plant primary loop voltage stabilizer as claimed in claim 1, wherein: the locking structure comprises a magic tape overlapping edge (13) and a magic tape locking belt (14); the heat preservation blocks are connected through magic tape overlapping edges (13), and the keel steel belt (2) and the heat preservation blocks are fixedly connected through magic tape locking belts (14).
4. The bottom thermal insulation device for the nuclear power plant primary loop voltage stabilizer as claimed in claim 1, wherein: the heat insulation structure adopts a single-layer or multi-layer detachable blanket type heat insulation, the seam heat insulation blankets are overlapped by 45-60-degree inclined seams, and the single weight of the heat insulation block is less than or equal to 30 kg.
5. A bottom heat preservation and insulation method for a loop voltage stabilizer of a nuclear power plant is characterized by comprising the following steps: the method comprises the following steps: the method comprises the following steps: confirming the prerequisite; step two: site construction conditions; step three: the bottom of the voltage stabilizer is removed after heat preservation; step four: collecting related data of the voltage stabilizer and prefabricating a new heat insulation structure; step five: the bottom of the voltage stabilizer is installed in a heat preservation way; step six: heat preservation optimization acceptance;
wherein: step five: stabiliser bottom heat preservation installation specifically includes: 1. checking and confirming that the number, the thickness, the relevant sizes and the like of the heat preservation blocks are completely correct and carrying the heat preservation blocks to the position of a specified area; 2. the heat preservation blocks are gradually installed from outside to inside, and a first layer of soft detachable heat preservation (4) and a second layer of soft detachable heat preservation (5) in the peripheral area of the periphery of the outermost ring electric heater are installed firstly; secondly, an outer ring heat insulation block (11), a middle 2 environment-friendly heat insulation block (10), a middle 1 ring heat insulation block (9), an inner ring heat insulation block (8) and a filler neck heat insulation block (7) are gradually installed towards the inner ring; 3. all gaps are tightly filled by small cotton pads; 4. the installation and the positioning of the heat insulation structure are completed, the fixing frame made of flat steel is firstly used for positioning, and then the secondary fixing of the heat insulation structure is completed by adopting the glass fiber cloth strips.
6. The method for preserving and insulating the bottom of the nuclear power plant primary loop voltage stabilizer as claimed in claim 5, wherein: the first step is as follows: the prerequisite confirmation specifically includes: 1. before entering the region at the bottom of the voltage stabilizer, the radiation protection personnel must be queried and the access is permitted after the personnel; 2. confirming that the scaffold erection conditions are met; 3. the field illumination meets the construction requirements; 4. and processing the operation application of the radiation control area.
7. The method for preserving and insulating the bottom of the nuclear power plant primary loop voltage stabilizer as claimed in claim 5, wherein: the second step is that: the field construction conditions specifically comprise: 1. confirming that the bottom area of the voltage stabilizer can enter and the environmental dosage rate can be accepted; 2. erecting a scaffold on site, and maintaining electric personnel and heat preservation personnel to perform on-site monitoring work; 3. confirming that the scaffold erection is finished and acceptance is qualified; 4. confirming that the construction isolation area is established; 5. electrical maintenance personnel must track and monitor throughout the insulation removal and reinstallation process to ensure that the surrounding electrical heater elements are not damaged by the insulation/scaffolding operation.
8. The method for preserving and insulating the bottom of the nuclear power plant primary loop voltage stabilizer as claimed in claim 5, wherein: the third step is that: the stabiliser bottom keeps warm and demolishs, specifically includes: 1. the working object can be confirmed on site together with the maintenance electric guardian, the scaffold is confirmed to be qualified for acceptance, and an acceptance qualified plate is hung; 2. removing about 3M straight pipe sections of a vertical part of a fluctuation pipe at the bottom of a lower end socket of the voltage stabilizer; 3. a fixing frame made of flat steel and used for fixing a lower end socket heat insulation cotton pad of the voltage stabilizer is removed, and the fixing frame is of a quick-opening structure and is connected by bolts; 4. and gradually removing the original heat insulation structure of the lower end socket of the voltage stabilizer from inside to outside until the original heat insulation structure is completely removed.
9. The method for preserving and insulating the bottom of the nuclear power plant primary loop voltage stabilizer as claimed in claim 5, wherein: the fourth step is that: the relevant data acquisition of stabiliser and insulation construction are prefabricated, specifically include: 1. actually measuring data required by heat preservation at the bottom of the voltage stabilizer on site; 2. determining the thicknesses of the heat insulation structures in different areas and corresponding heat insulation structures according to the field measured data; 3. and prefabricating a simulation body in a shape of 1:1 according to a drawing and field actual measurement data, and prefabricating a heat insulation structure on the simulation body.
10. The method for preserving and insulating the bottom of the nuclear power plant primary loop voltage stabilizer as claimed in claim 5, wherein: the sixth step is as follows: the heat preservation optimization acceptance specifically comprises: 1. the installation and the positioning of the heat insulation structure are completed, and all seams are tight and have no clearance; 2. the new heat insulation structure is installed and positioned to finish the heat radiation sheet of the electric heater of the voltage stabilizer, the outer surface of which is not allowed to be shielded and covered.
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