CN103915124A - Nuclear power station conventional island desalted water distribution system full-stop overhauling method - Google Patents
Nuclear power station conventional island desalted water distribution system full-stop overhauling method Download PDFInfo
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- CN103915124A CN103915124A CN201310495101.6A CN201310495101A CN103915124A CN 103915124 A CN103915124 A CN 103915124A CN 201310495101 A CN201310495101 A CN 201310495101A CN 103915124 A CN103915124 A CN 103915124A
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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
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Abstract
The invention discloses a nuclear power station conventional island desalted water distribution system full-stop overhauling method. The method comprises the steps that A, ice blockage is carried out on a main pipeline between a conventional island desalted water distribution system and a unit, and an isolating device and a connecting device are additionally arranged at the downstream part of ice blockage; B, a temporary water supply pipeline is connected to the connecting device from an SED, operation verification is carried out on the temporary water supply pipeline, and the temporary water supply pipeline is communicated with the main pipeline between the conventional island desalted water distribution system and the unit through the connecting device after the temporary water supply pipeline is qualified; C, the connecting device is opened to supply water to the unit, and then the isolating device is closed; D, the conventional island desalted water distribution system is made to stop fully, isolating and emptying are carried out, and damaged or aged devices on the main pipeline are replaced; E, a drain valve and a vent valve are opened fully, the system is filled with water, air in the system is exhausted, the system is washed, samples are taken for a laboratory test, and after the samples are qualified, the drain valve is closed, and the conventional island desalted water distribution system is put into operation; F, the connecting device is disconnected with the temporary water supply pipeline, and the connecting device is sealed. The nuclear power station conventional island desalted water distribution system full-stop overhauling method is convenient and rapid to implement, safe and low in cost.
Description
Technical field
The invention belongs to nuclear power technology field, relate to repair method, relate in particular to a kind of nuclear power station conventional island demineralized water distribution system full cut-off repair method.
Background technology
The function of conventional island demineralized water distribution system (SER) is to be 9 demineralized water for unit provides pH value.SDA(demineralized water production system) complete after demineralized water production, be transported in the D0SER401/402BA on YA north, again by the D0SER401/402PO that is arranged in YA manufacturer basement, by mother's pipe of D0SER, carry demineralized water by nuclear island demineralized water distribution system, conventional island demineralized water distribution system to nuclear island and the conventional island of unit respectively.
In existing nuclear power plant equipment, because conventional island demineralized water distribution system (SER) (is given conventional island 1, No. 2 unit supply demineralized waters, due to without active redundancy pipeline, cannot be realized full cut-off maintenance simultaneously; And be arranged on the rubber expansion joint on SER main pipeline, and therefore fail to arrange replacing to occur aging always, will cause chaser once lose efficacy.And because the female pipe of SER is given two unit supply demineralized waters (mainly consuming at conventional island) simultaneously, at the beginning of design, do not consider the function of a unit of isolation separately, also without active redundancy pipeline, normal isolation maintenance needs full cut-off SER, by affecting the normal moisturizing of the equipment such as two unit condensers, cause chaser.Therefore cannot realize full cut-off maintenance.
Expansion joint D0SER001/002/003JD had never changed since power plant project is installed, active time nearly 20 years, the catabiosis such as crackle appearred in surface, be clamminess.On May 3rd, 2010, to expansion joint, D0SEK001/002JD changes.After changing, finding that these two expansion joint inside are aging must be the same with rotten wood, powders at a touch with hand.
To cause two unit conventional islands, nuclear islands to lose SER moisturizing once above-mentioned 3 expansion joints lose efficacy, especially the moisturizing of the equipment such as condenser, cannot eliminate defect and will cause unit chaser in the short time.Therefore need to try every possible means as early as possible to arrange to change.
Summary of the invention
The technical problem to be solved in the present invention is, for the defect that cannot realize conventional island demineralized water distribution system full cut-off maintenance in prior art, provide a kind of fast and easy enforcement, safety, nuclear power station conventional island demineralized water distribution system full cut-off repair method that expense is low.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of nuclear power station conventional island demineralized water distribution system full cut-off repair method, comprises the following steps:
A, that conventional island demineralized water distribution system to the main pipeline of unit is carried out to ice is stifled; In the time that installing the spacer assembly of isolating for conventional island additional and lose pressure or dehydration for demineralized water distribution system, the stifled downstream of ice accesses the coupling arrangement at interim water source;
B, connect interim supply channel to coupling arrangement from nuclear island demineralized water distribution system nuclear island demineralized water distribution system, connected rear to interim supply channel put into operation checking check, putting into operation after checking passed examination, carrying out supplies water prepares, and described interim supply channel is by coupling arrangement and the main pipeline UNICOM that arrives unit;
C, open coupling arrangement and supply water to unit by interim supply channel, then close spacer assembly and cut off the water supply of conventional island demineralized water distribution system and unit;
D, all stop the work of conventional island demineralized water distribution system, isolate emptying conventional island demineralized water distribution system, change and damage or aging equipment;
E, damage or aging equipment carry out water-filling exhaust to conventional island demineralized water distribution system after changing, and keep all drain valve, vent valve standard-sized sheets, and pipeline, valve are rinsed; Sample examination, chemically examines the qualified drain valve conventional island demineralized water distribution system that puts into operation of closing; If chemically examine defective, continue to rinse to chemically examine qualified after, then close the drain valve conventional island demineralized water distribution system that puts into operation;
F, dismounting coupling arrangement are connected with interim supply channel, enclosed connecting device.
Described nuclear power station conventional island demineralized water distribution system full cut-off repair method, in described steps A, stifled the referring at conventional island demineralized water distribution system of ice arranges ice block apparatus to the main pipeline of unit, by ice block apparatus, water in corresponding main pipeline freezed to blocking pipe, isolation downstream line.
In described steps A, described spacer assembly is isolation valve; Install going on the female pipe of conventional island entrance of conventional island demineralized water distribution system.
In described steps A, described coupling arrangement is included in threeway and the bypass valve that spacer assembly downstream increases, and the arm end of bypass valve is removably connected with flange assembly or blind plate; When day-to-day operation, bypass valve arm end seals with blind plate, when use, blind plate is pulled down by flange assembly and is accessed interim supply channel.
In described steps A, before spacer assembly and coupling arrangement installation, they are carried out to bulge test, ensure the quality of products qualified; After spacer assembly and coupling arrangement installation, they are carried out to ultrasonic leakage detection, and rinse and water sampling chemical examination, chemically examine the interim supply channel of qualified rear access.
In described step B, connect interim supply channel step from nuclear island demineralized water distribution system and comprise:
A, manage on female pipe of nuclear island demineralized water distribution system arranged side by side with the mother of conventional island demineralized water distribution system, select two drain valves, in drain valve downstream line, difference sleeve welding method orchid, is connected respectively to two-way metal hose one end on these two flanges after flushing again;
B, at metal hose other end joint flange, and junction is rinsed;
After the chemical examination of c, water sampling is qualified, two metal hoses are connected with coupling arrangement respectively by the flange of the other end.
In described step B, described to interim supply channel put into operation checking check comprise the following steps:
A, by interim water supply line access nuclear island demineralized water distribution system respective lines downstream, rinse and carry out water sampling chemical examination, rinse until chemically examine qualified stopping;
B, unlatching drain valve, by flowmeter or downstream measuring cup water receiving way, the water supply capacity of clear and definite interim supply channel.
In described step C, between unit delivery period, irregularly make an inspection tour interim supply channel, prevent and repair in time the leakage of interim supply channel.
In described step D, the described work that all stops conventional island demineralized water distribution system refers to: the work of SER pump in halt system (conventional island demineralized water distribution system pump), and end conventional island demineralized water and distribute.
In described step D, described replacing damage or aging equipment comprise the following steps:
A, damage or aging equipment rinse to soak with the water of nuclear island demineralized water distribution system before changing and damage or aging equipment, and water sampling chemical examination, rinse until chemically examine qualified stopping;
After b, dismounting damage or aging equipment, need to use the water cleaning flange sealing surface of nuclear island demineralized water distribution system;
C, the maintenance mouth of pipe and damage or aging equipment inside surface are pollution-free and contactless, and line up checks, in the time of definite mouth of pipe planted agent foreign, new equipment is installed;
D, new equipment rinse after installing, and water sampling carries out OPC chemical examination, stop rinsing to chemically examining after qualified;
E, finally the equipment of new installation is carried out to preservative treatment.
The method of full cut-off maintenance of the present invention has the following advantages: successfully utilize on the one hand the stifled difficult problem of online spacer assembly and coupling arrangement being installed on main pipeline that solved of ice, can isolate fast the downstream line of the stifled point of ice, can implement to cut pipeline and spacer assembly is installed and coupling arrangement.Connect the interim interim supply channel supplying water owing to adopting from nuclear island demineralized water distribution system on the other hand, interim water supply can be satisfied the demand from aspects such as water quality, flow, pressure, and the two spacing is short, easy to implement.In ensureing maintenance, also ensure the water supply of conventional island unit.
The present invention has novelty at following three aspects:: the water source of 1, introducing nuclear island demineralized water distribution system meets single unit SER water requirements; 2, it is stifled that the success of heavy caliber carbon steel piping realizes ice; 3, single unit increases isolation valve/bypass valve to realize full cut-off function.The present invention is a novelty, easy method, by proving, test and facts have proved its feasibility, and complete smoothly on a nuclear power station SER main pipeline and to have damaged or the replacing of aging equipment, the method has great directive significance for similar nuclear power station, and this nuclear power station also adopts this scheme to supply water to L2SER and be successfully completed L1ASG gravity moisturizing test during L109 overhaul temporarily, there are smoothly outstanding contributions for follow-up similar unit ASG gravity moisturizing test.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the structural representation of embodiment of the present invention ice block apparatus;
Structural representation when Fig. 2 is the filling of embodiment of the present invention ice block apparatus;
Fig. 3 is the partial enlarged drawing of embodiment of the present invention ice block apparatus.
Embodiment
Understand for technical characterictic of the present invention, object and effect being had more clearly, now contrast accompanying drawing and describe the specific embodiment of the present invention in detail.
A kind of nuclear power station conventional island demineralized water distribution system full cut-off repair method, comprises the following steps:
A, that conventional island demineralized water distribution system to the main pipeline of unit is carried out to ice is stifled; Stifled the referring at conventional island demineralized water distribution system of ice arranges ice block apparatus to the main pipeline of unit, by ice block apparatus, water in corresponding main pipeline freezed to blocking pipe, isolation downstream line.
Ice block apparatus can directly be sleeved on the pipeline needing repairing, refrigerant is poured in the chuck of ice block apparatus, refrigerant heat absorption, can be fast by ducted water freezing corresponding fixture, blocking pipe, like this without valve-off, just realized the shutoff of pipeline, detachable maintaining aging or damage equipment and pipeline, change or maintenance after remove ice block apparatus, just recovered flowing of water in pipe, the present invention is simple in structure, convenient and reliable operation, energy Rapid Implementation maintain and replace, has saved a large amount of maintenance costs, has also avoided the waste of water simultaneously.
In the present embodiment, cannot full cut-off due to the former design reasons of conventional island demineralized water distribution system, therefore, need to adopt the main pipeline of the stifled conventional island demineralized water distribution system of ice to a unit of conventional island, to isolate the stifled point of an ice downstream line, cutting pipeline also increases isolation valve.But the stifled work of ice will affect downstream SER user, therefore can only during No. 1 machine overhaul, carry out.Conventional island demineralized water distribution system to the main pipeline diameter of a unit of conventional island is 8 " (DN200mm), the material of main pipeline is carbon steel pipe.The stifled refrigerant of ice can be selected liquid nitrogen and dry ice, due to CO
2temperature is low not, the icicle friction force deficiency of formation, the stifled maximum caliber of ice is 2 ", and liquid nitrogen ice plugging footpath can reach 10 ", therefore the present invention finally chooses the stifled scheme of liquid nitrogen ice.Ice block apparatus of the present invention is level and vertically installation at the scene, easy accessibility, liquid nitrogen good seal performance, liquid nitrogen cavity volume is reasonable, liquid nitrogen perfusing hole and vent port size design are reasonable, isolation of system effect while ensureing the stifled enforcement of ice, implements checking through the present embodiment at nuclear power station SER system for field, respond well.
Concrete disclosure after the square method of concrete structure of ice block apparatus.
In the time that installing the spacer assembly of isolating for conventional island additional and lose pressure or dehydration for demineralized water distribution system, the stifled downstream of ice accesses the coupling arrangement at interim water source.Described spacer assembly the present embodiment is chosen as isolation valve, except isolation valve, and the valve that also can adopt other to open and close for pipeline; Install going on the female pipe of conventional island entrance of conventional island demineralized water distribution system; Described coupling arrangement is included in threeway and the bypass valve that spacer assembly downstream increases, and the arm end of bypass valve is removably connected with flange assembly or blind plate; When day-to-day operation, bypass valve arm end seals with blind plate, when use, blind plate is pulled down by flange assembly and is accessed interim supply channel.Flange assembly be comprise a large flange, at large two little flanges of flange welding, little flange is tightly connected with interim supply channel.
Before spacer assembly and coupling arrangement installation, all need them to carry out bulge test, to ensure the quality of products qualified, bulge test is routine techniques, does not repeat them here; After spacer assembly and coupling arrangement installation, they are carried out to ultrasonic leakage detection, and rinse and water sampling chemical examination, chemically examine the interim supply channel of qualified rear access, ultrasonic leakage detection is routine techniques, does not repeat them here.
In the present embodiment, on the female pipe of the conventional island entrance of going to a unit of conventional island demineralized water distribution system, increase a DN200 butterfly isolation valve 0SER021VD, as total isolation valve of SER system 1 machine conventional island; The threeway and the bypass valve 0SER022VD that increase a DN200*200 in 0SER021VD downstream, access interim water source for SER system while losing pressure or dehydration.When day-to-day operation, bypass valve arm end seals with blind plate, is pulled down the interim supply channel of access when use.
B, connect interim supply channel to coupling arrangement from nuclear island demineralized water distribution system, connected rear to interim supply channel put into operation checking check, putting into operation after checking passed examination, carrying out supplies water prepares, and described interim supply channel is by coupling arrangement and the main pipeline UNICOM that arrives unit.
In the present embodiment, because the impact that upstream device is supplied water is as follows:
1, EX condenser moisturizing, as lose SER moisturizing, will cause chaser;
2, SER sealing jellyfish pipe, the negative pressure valve valve stem seal being connected with condenser, losing moisturizing will affect condenser vacuum, in serious situation, will cause chaser;
3, SRI001BA moisturizing, SEN pump can consume with SER shaft seal water, and losing moisturizing will affect the normal operation of pump;
4, STR001DZ moisturizing, affects the use of SVA steam;
5, the moisturizing of SER001BA elevated tank, affects the sealing of the valve packings such as APP;
6, CVI separation water tank does not have moisturizing, and impact is little;
7, the MP wash-down water of CRF debris filter, impact is little.
8, JPI is fed to the moisturizing of RCV one-level fire water water tank, and impact is little.
Therefore, ensure the water of above-mentioned main watering equipment, just need the water of certain pressure, flow.
Connecting interim supply channel step from nuclear island demineralized water distribution system comprises:
A, manage on the female pipe of nuclear island demineralized water distribution system arranged side by side with the mother of conventional island demineralized water distribution system in GB gallery the inside, select two drain valves, in drain valve downstream line, difference sleeve welding method orchid, is connected respectively to two-way metal hose one end on these two flanges after flushing again;
B, at metal hose other end joint flange separately, and junction is rinsed;
After the chemical examination of c, water sampling is qualified, two metal hoses are connected with coupling arrangement respectively by the flange of the other end.Connection by metal hose be the flange assembly in coupling arrangement, the flange of metal hose end docks with the little flange seal in flange assembly, forms path between the two.
In the present embodiment, from drain valve D0SED387VD, D1SED214VD(all in GB piping lane) in draw the metal hose of two DN25 to the arm end of bypass valve D0SER022VD.Wherein D0SED387VD, D1SED214VD downstream line port, apart from ground space deficiency, need be chosen correct position and cut away pipe string, and then sleeve welds a flange respectively.The dismantle blind plate of bypass valve D0SER022VD arm end, is installed to the flange assembly processing the arm end of bypass valve.Flanged (FLGD) metal hose of 2 Dn25 that also clamp flange connects is installed.Opening drain valve D0SED387VD, D1SED214VD valve, then opening bypass valve D0SER022VD, just can realize conventional island demineralized water distribution system and supply water temporarily.
Described to interim supply channel put into operation checking check comprise the following steps:
A, by interim water supply line access nuclear island demineralized water distribution system respective lines downstream, rinse and carry out water sampling chemical examination, rinse until chemically examine qualified stopping;
B, unlatching drain valve, by flowmeter or downstream measuring cup water receiving way, the water supply capacity of clear and definite interim supply channel.
C, open coupling arrangement and supply water to unit by interim supply channel, then close spacer assembly and cut off the water supply of conventional island demineralized water distribution system and unit.To between unit delivery period, irregularly make an inspection tour interim supply channel, prevent and repair in time the leakage of interim supply channel.
In the present embodiment, first drive the bypass valve of nuclear island demineralized water distribution system feed water valve and conventional island demineralized water distribution system, then close the isolation valve of conventional island demineralized water distribution system, to ensure the not dehydration of downstream user of conventional island demineralized water distribution system.But may there is conventional island demineralized water distribution system to return water to nuclear island demineralized water distribution system polluted water risk.Think and switch moment because nuclear island demineralized water distribution system pressure of supply water (6.5 ?about 7bar.g) is than conventional island demineralized water distribution system (6 ?6.5bar.g left and right) height, there will not be in theory this problem; Even if occur, amount also can be considerably less, after switching, also can be back to conventional island demineralized water distribution system user with stream.Before the connecting systems such as interim water supply hose, flange, use SER or nuclear island demineralized water distribution system water rinse well and sample examination qualified, especially note the flexible pipe inside greasy dirt that do not have, otherwise use hot water injection.
TSD is installed to the last before a step, water sampling chemical examination is qualified.
Water supply capacity inspection:
1, enrich the water
Rule of thumb, normal rate of water make-up every unit SER rate of water make-up approximately 100 sides every day, the about 4.16T/H of average discharge.And by field demonstration, the nuclear island demineralized water distribution system pipeline enrich the water of single DN25 is about 7.2m
3/ H (7.2t/H).
Before formal full cut-off maintenance, interim water supply TSD is tested: after TSD installs, need this full cut-off inspection and repair shop of the about 40H(of test ruuning situation to take time).Be specially and open nuclear island demineralized water distribution system feed water valve, close SER main isolating valve 0SER021VD, through its interim water supply capacity of 40H trial run checking; Recover D1SER normal water supply once extremely open 0SER021VD by operations staff.
2, Water Quality Evaluation
SER is conventional island demineralized water, and nuclear island demineralized water distribution system is nuclear island demineralized water, and difference just has hydrazine in SER water.Adopt the interim water supply of nuclear island demineralized water distribution system to need ammonification to SER moisturizing, can carry out by SIR ammonification through chemical personnel's demonstration.
3, the impact analysis to nuclear island demineralized water distribution system itself
Whether, from the moisturizing of nuclear island demineralized water distribution system, some water will branch to SER, have impact to need to analyze on the water consumption of nuclear island demineralized water distribution system.The overall interim moisturizing time is probably no more than 40H, and rule of thumb total rate of water make-up is no more than 167 sides (every unit SER moisturizing every day approximately 100 sides), and therefore total rate of water make-up is on the impact of nuclear island demineralized water distribution system upstream user (water tank is 500 sides) nothing.
During another full cut-off, can control nuclear island demineralized water distribution system water, comprise that chemical personnel control moisturizing by 1REA/ATE, and notice requires overhaul unit to use less nuclear island demineralized water distribution system water source as far as possible.
4, nuclear island demineralized water distribution system water pump capability evaluation
For nuclear island demineralized water distribution system, increase the user outside some designs, whether the ability of nuclear island demineralized water distribution system water pump enough needs assessment.Nuclear island demineralized water distribution system pump has two, and every design discharge is 80M
3/ H.Nuclear island demineralized water distribution system maximum flow every day is M more than 100
3(in 200 sides); SER every day, every machine consumption was 100M
3; Calculate like this, flow altogether can not exceed 300M
3, be equivalent to 12.5M
3/ H, much smaller than the design discharge of a pump.From the design, can meet the normal demand under at present interim state.In addition, also has a stand-by pump.
5, to nuclear safety impact analysis
Once accident conditions appears in D1MX, may cause D1SER insufficient water problem.What impact is these problems have need to analyze on unit safety.
In checking safe related system equipment, 9ASG001DZ can be supplied water by nuclear island demineralized water distribution system, the unavailable availability of 9ASG001DZ to ASG001BA moisturizing that do not affect of SER.According to system, equipment and part classification supervisory routine, nuclear island demineralized water distribution system and SER belong to QR system but not QSR system, and technical manual is to this two system no requirement (NR).Accident as I2.1 in, if cannot be to D1ASG001BA moisturizing, unit will require the operating mode that connects to RRA of recession, the safety of unit is not directly related with this two system.As there is similar accident operating mode, carry out corresponding malfunction protocol and carry out operation when the time comes, on the not directly impact of the nuclear safety of unit
D, all stop the work of conventional island demineralized water distribution system, isolate emptying conventional island demineralized water distribution system, change and damage or aging equipment;
The described work that all stops conventional island demineralized water distribution system refers to: the work of SER pump in halt system, and end conventional island demineralized water and distribute.
Described replacing damage or aging equipment comprise the following steps:
A, damage or aging equipment rinse to soak with nuclear island demineralized water distribution system water before changing and damage or aging equipment, and water sampling chemical examination, rinse until chemically examine qualified stopping;
B, remove the water cleaning flange sealing surface that needs to use nuclear island demineralized water distribution system after old damage or aging equipment;
C, the maintenance mouth of pipe and damage or aging equipment inside surface are pollution-free and contactless, and line up checks, in the time of definite mouth of pipe planted agent foreign, new equipment is installed;
D, new equipment rinse after installing, and sampling is chemically examined, and stop rinsing to chemically examining after qualified.
E, finally the equipment of new installation is carried out to preservative treatment.
E, damage or aging equipment carry out water-filling exhaust to conventional island demineralized water distribution system after changing, and keep all drain valve, vent valve standard-sized sheets, and pipeline, valve are rinsed; Sample examination, chemically examines the qualified drain valve conventional island demineralized water distribution system that puts into operation of closing; If chemically examine defective, continue to rinse to chemically examine qualified after, close the drain valve conventional island demineralized water distribution system that puts into operation.
F, dismounting coupling arrangement are connected with interim supply channel, enclosed connecting device.
Remove the joint flange between interim supply channel and bypass valve D0SER022VD, close bypass valve D0SER022VD, blind plate is installed at flange-interface place.
As shown in Figure 1, 2, 3, a kind of ice block apparatus for pipe plugging, for form the device of shutoff at waterpipe, for the ice block apparatus of pipe plugging comprise be fitted in pipeline outer wall for loading at least two chucks 1 of refrigerant, for refrigerant being filled in to the feeding mechanism 5 of chuck, the interior sidewall surface shape of described chuck 1 is consistent with pipeline outer wall form fit, on described chuck 1, be provided with charging exhausr port 2, described feeding mechanism 5 is corresponding with charging exhausr port 2, and described chuck 1 is fixed together by removable connector 3.
Chuck 1 is to be used to form the stifled critical piece of ice, stifled owing to will forming fast ice, within one week, can there is refrigerant more can make cold conduction fast at pipeline, and pipeline is circular pipe, chuck 1 is installed need to be sleeved on pipeline, independently a chuck 1 is difficult to implement, and therefore needs at least two chucks 1 to complete installation, and ensures that refrigerant evenly transmits cold to pipeline.Require in addition the interior sidewall surface shape of chuck 1 consistent with pipeline outer wall form fit, chuck 1 just makes refrigerant efficiently to conduct fast with pipeline laminating.
Chuck 1 arranges and can, along the setting of pipeline one-week interval, preferably evenly arrange, and more preferably the described chuck 1 of at least two is end to end surrounds pipeline around one week formation tubular structure of pipeline.Can on the limited outer wall area of pipeline, form enough colds like this, form fast ice stifled.Chuck 1 described in the present embodiment arranges two, is respectively the first chuck 11 and the second chuck 12.Described the first chuck 11 and the second chuck 12 are all arc chuck, and the two fastens closed conduct one week.
The length of chuck 1 is relevant with caliber, the water flow velocity of pipeline, can design according to real data.Structure and the shape of chuck 1 are not construed as limiting, only need the wall of inner side of chuck 1 consistent with pipeline outer wall face shape, chuck 1 interior sidewall surface and the laminating of pipeline outer wall face, because pipe shape mostly is pipe, chuck 1 internal face is shaped as arc, between chuck 1 and pipeline, could form good conducting, realize conduction cold fast.
Although it is multiple that chuck 1 arranges, can UNICOM between chuck 1 also UNICOM not.The first embodiment is: each chuck 1 is provided with the hollow cavity 13 of splendid attire refrigerant, and between adjacent chuck 1, removable seal connects, and the hollow cavity 13 of adjacent chuck 1 is interconnected.The second embodiment is: each described chuck 1 is independent sealing separately, and the outer side surface of each chuck 1 is or/and arrange separately charging exhausr port 2 on end face.
Between adjacent chuck 1, to be fixed together, be that the fixed form of multiple chucks 1 on pipeline can have multiple, the structure that is removable connector 3 has multiple, only chuck 1 detachably need be fixed into an entirety, for example: the modes such as bolt, pipe collar, locking latch, buckle connection, removable connector 3 described in the present embodiment is bolt, on adjacent chuck 1, is respectively arranged with connecting hole, and described connecting hole is detachably fixed together by bolt.Connecting hole evenly arranges multiple, the corresponding connecting hole setting of bolt.The fixed form that removable connector 3 is pipe collar is: be outside equipped with pipe collar at chuck 1, adopt pipe collar that multiple chucks 1 are fastened on pipeline.Locking latch refers to: the adjacent concavo-convex cooperation of chuck 1, after grafting, be fixed together, for example: chuck 1 end face is provided with groove, on another chuck 1 end face, be provided with convex edge, boss is inserted in groove from groove one end, groove is just locked in boss in groove can not deviate from, and groove and convex edge are removable connector 3.Buckle connection refers to that it is buckle and snap ring that removable connector 3 is set respectively on adjacent chuck 1, and buckle is connected in snap ring two chucks 1 are fixed together.
As shown in Figure 3, in embodiment for hollow cavity 13 UNICOMs, in order to prevent coolant leakage, require the binding face of adjacent two chucks 1 better to coordinate, the gap of the two is as far as possible little, reduce and leak, and can adopt the mode of sealing, by the clearance seal between the two, be between described adjacent chuck 1, to be provided with the seal 6 for sealing the two gap, seal 6 adopts O-ring seal or sealing gasket, can also adopt other hermetically-sealed construction, and O-ring seal and sealing gasket can adopt the soft structures such as rubber.
Preferably the binding face between described adjacent two chucks 1 is plane, and each binding face extends outward and connect along 15, and described connection, along having connecting hole 16 on 15, is coated with bolt two chucks 1 are detachably fixed together in connecting hole 16.The quantity of connecting hole 16 is relevant with chuck 1 length, and chuck 1 length is long, and what connecting hole 16 was offered is many.The connecting hole 16 of chuck 1 both sides is preferably symmetrical arranged, and chuck 1 is stressed even, indeformable like this, and the gap between adjacent two chucks 1 is just not yielding, reduces and leaks.
The charging exhausr port 2 arranging on chuck 1, can be to arrange separately one, also can be paired setting, when a charging exhausr port 2 is set, this mouth be all passed through in charging and exhaust, therefore caliber setting can be relatively larger, when two charging exhausr ports 2 are set, the paired interval of described charging exhausr port 2 arranges, and one of them is for loading refrigerant, another exhaust, two charging exhausr port 2 interval locations can far some be beneficial to filling exhaust.
Because pipeline is horizontally disposed with and vertically arranges two kinds, on the outer side surface of described chuck 1 and end face, be respectively arranged with charging exhausr port 2, pipeline can conveniently not filled refrigerant in the time being horizontally disposed with and vertically arrange like this, on horizontal pipe, the charging exhausr port 2 that chuck 1 end face arranges is by plug shutoff, on vertical pipeline, the charging exhausr port 2 arranging on chuck 1 lateral wall is by plug shutoff, Leakage prevention.No matter the chuck 1 on horizontal pipe and vertical pipeline, charging exhausr port 2 positions are generally on chuck 1 top.
Refrigerant can select dry ice, liquid nitrogen etc. multiple, specifically according to actual conditions choice for use.
Feeding mechanism 5 is the instruments for refrigerant being filled into chuck 1, and the structure that can be used for filling refrigerant is all applicable to the present invention.As: funnel, feed pipe etc., corresponding liquid nitrogen, can adopt funnel, can also directly adopt feed pipe to be inserted in the charging exhausr port 2 of chuck.Can also screw thread be set at a charging exhausr port 2, feed pipe is screwed onto on charging exhausr port 2, utilize another charging exhausr port 2 exhausts.
Be used for the specific implementation process of the ice block apparatus of pipe plugging: nuclear power station conventional island demineralized water distribution system (SER), cannot full cut-off due to the former design reasons of SER, therefore must be undertaken by nonconventional approaches the transformation that increases isolation valve, bypass valve on the pipeline of this system.Block up the main pipeline of SER toward 1MX system by ice, to isolate the stifled point of ice downstream line, cutting pipeline also increases isolation valve.
And SER to 1MX main pipeline diameter is 8 " carbon steel pipe (DN200mm); because CO2 temperature is low not, the icicle friction force deficiency of formation, the stifled maximum caliber of ice is 2 ", and liquid nitrogen ice plugging footpath can reach 10 ", finally choose liquid nitrogen as the stifled refrigerant of ice.
The stifled employing of the ice ice block apparatus for pipe plugging of the present invention, the sealing property requiring according to liquid nitrogen, and determine the capacity of the volumetric quantity of liquid nitrogen and the hollow cavity of chuck according to the caliber of pipeline, the cold tolerance energy of ice block apparatus and seal, the intensity of ice block apparatus and rigidity requirement, on-the-spot clamping space, the layout of liquid nitrogen perfusing hole and vent port, the factors such as the tolerance clearance of ice block apparatus and pipeline appearance.Finally make a set of ice block apparatus of the present invention, this ice block apparatus is level and vertically installation at the scene, easy accessibility, liquid nitrogen good seal performance, liquid nitrogen cavity volume is reasonable, and liquid nitrogen perfusing hole and vent port size design are reasonable, the isolation of system effect while ensureing the stifled enforcement of ice, implement checking through Daya Gulf and ridge Australia first phase nuclear power station SER system for field, respond well.
Claims (10)
1. a nuclear power station conventional island demineralized water distribution system full cut-off repair method, is characterized in that, comprises the following steps:
A, that conventional island demineralized water distribution system to the main pipeline of unit is carried out to ice is stifled; In the time that installing the spacer assembly of isolating for conventional island additional and lose pressure or dehydration for conventional island demineralized water distribution system, the stifled downstream of ice accesses the coupling arrangement at interim water source;
B, connect for the interim interim supply channel supplying water to coupling arrangement from nuclear island demineralized water distribution system, connected rear to interim supply channel put into operation checking check, putting into operation after checking passed examination, carrying out supplies water prepares, and described interim supply channel is by coupling arrangement and the main pipeline UNICOM that arrives unit;
C, open coupling arrangement and supply water to unit by interim supply channel, then close spacer assembly and cut off the water supply of conventional island demineralized water distribution system and unit;
D, all stop the work of conventional island demineralized water distribution system, isolate emptying conventional island demineralized water distribution system, change and damage or aging equipment;
E, damage or aging equipment carry out water-filling exhaust to conventional island demineralized water distribution system after changing, and keep all drain valve, vent valve standard-sized sheets, and pipeline, valve are rinsed; Sample examination, chemically examines the qualified drain valve conventional island demineralized water distribution system that puts into operation of closing; If chemically examine defective, continue to rinse to chemically examine qualified after, then close the drain valve conventional island demineralized water distribution system that puts into operation;
F, dismounting coupling arrangement are connected with interim supply channel, enclosed connecting device.
2. nuclear power station conventional island demineralized water distribution system full cut-off repair method according to claim 1, it is characterized in that, in described steps A, stifled the referring at conventional island demineralized water distribution system of ice arranges ice block apparatus to the main pipeline of unit, by ice block apparatus, water in corresponding main pipeline is freezed to blocking pipe, isolation downstream line.
3. nuclear power station conventional island demineralized water distribution system full cut-off repair method according to claim 2, it is characterized in that, described ice block apparatus comprise be fitted in pipeline outer wall for loading at least two chucks of refrigerant, the interior sidewall surface shape of described chuck is consistent with pipeline outer wall form fit, on described chuck, be provided with charging exhausr port, described chuck is fixed together by removable connector.
4. nuclear power station conventional island demineralized water distribution system full cut-off repair method according to claim 1, is characterized in that, in described steps A, described spacer assembly is isolation valve; Install going on the female pipe of conventional island entrance of conventional island demineralized water distribution system.
5. nuclear power station conventional island demineralized water distribution system full cut-off repair method according to claim 1, it is characterized in that, in described steps A, described coupling arrangement is included in threeway and the bypass valve that spacer assembly downstream increases, and the arm end of bypass valve is removably connected with flange assembly or blind plate; When day-to-day operation, bypass valve arm end seals with blind plate, when use, blind plate is pulled down by flange assembly and is accessed interim supply channel.
6. nuclear power station conventional island demineralized water distribution system full cut-off repair method according to claim 1, is characterized in that, in described steps A, before spacer assembly and coupling arrangement installation, they is carried out to bulge test, ensures the quality of products qualified; After spacer assembly and coupling arrangement installation, they are carried out to ultrasonic leakage detection, and rinse and water sampling chemical examination, chemically examine the interim supply channel of qualified rear access.
7. nuclear power station conventional island demineralized water distribution system full cut-off repair method according to claim 1, is characterized in that, in described step B, connects interim supply channel step comprise from nuclear island demineralized water distribution system:
A, manage on female pipe of nuclear island demineralized water distribution system arranged side by side with the mother of conventional island demineralized water distribution system, select two drain valves, in drain valve downstream line, difference sleeve welding method orchid, is connected respectively to two-way metal hose one end on these two flanges after flushing again;
B, at metal hose other end joint flange separately, and junction is rinsed;
After the chemical examination of c, water sampling is qualified, two metal hoses are connected with coupling arrangement respectively by the flange of the other end.
8. nuclear power station conventional island demineralized water distribution system full cut-off repair method according to claim 1, is characterized in that, in described step B, described to interim supply channel put into operation checking check comprise the following steps:
A, by interim water supply line access nuclear island demineralized water distribution system respective lines downstream, rinse and carry out water sampling chemical examination, rinse until chemically examine qualified stopping;
B, unlatching drain valve, by flowmeter or downstream measuring cup water receiving way, the water supply capacity of clear and definite interim supply channel.
9. nuclear power station conventional island demineralized water distribution system full cut-off repair method according to claim 1, it is characterized in that, in described step D, the described work that all stops conventional island demineralized water distribution system refers to: the work of SER pump in halt system, and end conventional island demineralized water and distribute.
10. nuclear power station conventional island demineralized water distribution system full cut-off repair method according to claim 1, is characterized in that, in described step D, described replacing damage or aging equipment comprise the following steps:
A, damage or aging equipment rinse to soak with the water of nuclear island demineralized water distribution system before changing and damage or aging equipment, and water sampling chemical examination, rinse until chemically examine qualified stopping;
After b, dismounting damage or aging equipment, need to use the water cleaning flange sealing surface of nuclear island demineralized water distribution system;
C, the maintenance mouth of pipe and damage or aging equipment inside surface are pollution-free and contactless, and line up checks, in the time of definite mouth of pipe planted agent foreign, new equipment is installed;
D, new equipment rinse after installing, and water sampling is chemically examined, and stop rinsing to chemically examining after qualified;
E, finally the equipment of new installation is carried out to preservative treatment.
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| CN105108445A (en) * | 2015-08-12 | 2015-12-02 | 大唐湘潭发电有限责任公司 | Method for handling high-pressure fire-resistant oil leakage |
| CN106352155A (en) * | 2016-09-23 | 2017-01-25 | 广东核电合营有限公司 | Online pressure seal overhauling method of primary loop check valve of nuclear power plant |
| CN110124236A (en) * | 2019-04-17 | 2019-08-16 | 岭澳核电有限公司 | The synchronous method for replacing peripheral workshop fire-fighting water isolation valve of nuclear power station |
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| CN110241886A (en) * | 2019-05-16 | 2019-09-17 | 岭澳核电有限公司 | Million kilowatt nuclear power station essential service water system repair method and device |
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| CN110448844A (en) * | 2019-07-12 | 2019-11-15 | 岭澳核电有限公司 | The synchronous method for replacing peripheral workshop fire-fighting water isolation valve of nuclear power station |
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| CN105108445A (en) * | 2015-08-12 | 2015-12-02 | 大唐湘潭发电有限责任公司 | Method for handling high-pressure fire-resistant oil leakage |
| CN106352155A (en) * | 2016-09-23 | 2017-01-25 | 广东核电合营有限公司 | Online pressure seal overhauling method of primary loop check valve of nuclear power plant |
| CN106352155B (en) * | 2016-09-23 | 2018-06-19 | 广东核电合营有限公司 | One loop of nuclear power station non-return valve on-line pressure sealant repair method |
| CN110124236A (en) * | 2019-04-17 | 2019-08-16 | 岭澳核电有限公司 | The synchronous method for replacing peripheral workshop fire-fighting water isolation valve of nuclear power station |
| CN110170121A (en) * | 2019-04-17 | 2019-08-27 | 岭澳核电有限公司 | Nuclear power station fire_fighting pipe network system and nuclear power station fire_fighting pipe network method for on-line optimization |
| CN110170121B (en) * | 2019-04-17 | 2021-05-07 | 岭澳核电有限公司 | Nuclear power station fire-fighting pipe network system and nuclear power station fire-fighting pipe network online optimization method |
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| CN110448844A (en) * | 2019-07-12 | 2019-11-15 | 岭澳核电有限公司 | The synchronous method for replacing peripheral workshop fire-fighting water isolation valve of nuclear power station |
| CN112044173A (en) * | 2020-08-13 | 2020-12-08 | 沪东中华造船(集团)有限公司 | Temporary filtering implementation method for pipeline in debugging stage of large-scale ship equipment |
| CN113782237A (en) * | 2021-08-03 | 2021-12-10 | 中广核核电运营有限公司 | Maintenance method for reactor core measurement system sealing section |
| CN113782237B (en) * | 2021-08-03 | 2024-03-29 | 中广核核电运营有限公司 | Maintenance method for seal section of reactor core measurement system |
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