CN106270960A - A kind of plugging method for Condenser Titanium Tube - Google Patents

A kind of plugging method for Condenser Titanium Tube Download PDF

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Publication number
CN106270960A
CN106270960A CN201610686082.9A CN201610686082A CN106270960A CN 106270960 A CN106270960 A CN 106270960A CN 201610686082 A CN201610686082 A CN 201610686082A CN 106270960 A CN106270960 A CN 106270960A
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China
Prior art keywords
pipe
titanium
titanium pipe
vacuum
close
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CN201610686082.9A
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Chinese (zh)
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CN106270960B (en
Inventor
何剑坤
王健
吴秋
马昌盛
魏岩
赵畅
杨飞鹏
刘振国
齐伟
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哈尔滨汽轮机厂有限责任公司
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/16Arc welding or cutting making use of shielding gas
    • B23K9/167Arc welding or cutting making use of shielding gas and of a non-consumable electrode
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K33/00Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
    • B23K33/004Filling of continuous seams
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00Investigating fluid-tightness of structures
    • G01M3/02Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/20Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
    • G01M3/22Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
    • G01M3/225Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for welds

Abstract

A kind of plugging method for Condenser Titanium Tube, belongs to steam turbine technology field.It is of poor quality that the present invention solves the titanium pipe closure that existing Condenser Titanium Tube plugging technology exists, and the problem that cannot check tightness that titanium pipe blocks before unit operation.A kind of plugging method for Condenser Titanium Tube, step is as follows: one, use the full titanium pipe close closure titanium pipe two ends mouth of pipe;Two, the GTAW technique full titanium pipe close and the titanium pipe mouth of pipe respectively to titanium pipe two ends is used to carry out sealing welding;Three, vacuum foam leakage detection apparatus butt welded seam is utilized to carry out leak check.The present invention is for the closure of titanium pipe.

Description

A kind of plugging method for Condenser Titanium Tube
Technical field
The present invention relates to a kind of Condenser Titanium Tube plugging method, belong to steam turbine technology field.
Background technology
Condenser is as a visual plant of nuclear power plant's secondary circuit, and the normal economical operation of steam turbine is played to pass by it Important effect.Cooling Tubes of Condenser plays the effect of steam condensation Cheng Shui, is the core component in condenser.Therefore cool down The selection quality of pipe determines security reliability and the service life of condenser.Industrially pure titanium has good mechanical property with resistance to Erosion performance, is the most frequently used material of Cooling Tubes of Condenser.Hereinafter cooling tube is referred to as titanium pipe.
The exigent air-tightness of nuclear power plant's turbine condenser, and during nuclear power plant's condenser longtime running, by running work Condition affects, it is difficult to avoid there will be the problem that Condenser Titanium Tube is revealed, and the reason causing Condenser Titanium Tube to be revealed is a lot.Due to Titanium pipe safeguard procedures are not in place, in transportation protection the reason such as be not good at, be likely to result in partial-titanium pipe and there is slight damage.Unit Run duration can experience the experiment works such as removal of load, hypervelocity, high back pressure and repeatedly start and stop, and the damage location of titanium pipe likely can Expand further, and then cause titanium pipe to reveal.Although condenser recirculating cooling water system is equipped with filter screen, overwhelming majority rubbish in sea water Rubbish will not enter Condenser Titanium Tube.But the hard sharp foreign bodies such as the medium and small shell of sea water are it is possible to enter condenser titanium with sea water Pipe, if these foreign matters are in Condenser Titanium Tube, under current constantly impact, can make titanium pipe produce vibration and displacement, pass through A period of time titanium pipe will be worn out.Condenser uppermost titanium pipe bears a large amount of steam impringement, under the long-term impact of steam also Easily cause titanium pipe to damage.Nuclear power plant's condenser has up to ten thousand titanium pipes, and in longtime running, once some of which titanium pipe is damaged, just There is a possibility that sea water is released into Steam Side of Condenser, bring nuclear island steam generator secondary side therewith into, make secondary side water degradation, The too high meeting of sodium, chlorine ion concentration causes steam generator heat-transfer pipe to corrode, and seriously corroded then causes steam generator heat-transfer pipe to break Splitting, make nuclear power plant's active water of primary Ioops band enter secondary circuit, consequence is extremely serious.Condenser Titanium Tube is once revealed, will Cause nuclear power plant's turbine LP rotors non-programmed halt, directly influence economy and the safe operation of nuclear power plant.Therefore, solidifying Can vapour device titanium pipe process after occurring revealing in enforcement fast and effectively, for ensureing the safe and stable operation of nuclear power plant, and maximum journey The economic loss caused is shut down in reducing of degree, significant.
At present, the existing treatment technology after leakage occurs in Condenser Titanium Tube is to use taper nylon stopper closure titanium pipe, logical Cross external force and nylon stopper is squeezed in titanium pipe pore, to realize the closure to leakage titanium pipe.But due to condenser longtime running, envelope Stifled plug is easily produced loosening by the effect of hydraulic blow and vibration, situation about loosening once occurs, will cause condenser Titanium pipe is again revealed and shuts down.Therefore, in place of this plugging technology Shortcomings, it is impossible to ensure Condenser Titanium Tube airtight quality.Separately Outward, titanium pipe, after using plug closure, lacks effective measuring means and confirms titanium pipe closure sealing, can only be at unit operation Time, the tightness of vapour side and water side by checking condenser blocks quality with confirmation titanium pipe, and this brings safety for unit operation Hidden danger.When taking existing plugging technology that Condenser Titanium Tube leakage occur is implemented closure, for ensureing titanium pipe closure quality, need The strict each operation link controlling titanium pipe plug pipe process, can at utmost ensure titanium pipe plug pipe quality, which increase quality Process control pressure, it is difficult to stop human-equation error hidden danger.
Summary of the invention
The present invention is that the titanium pipe existed to solve existing Condenser Titanium Tube plugging technology blocks of poor quality, and cannot The problem checking the tightness of titanium pipe closure before unit operation, and then provide a kind of plugging side for Condenser Titanium Tube Method.
The present invention solves that above-mentioned technical problem be the technical scheme is that
A kind of plugging method for Condenser Titanium Tube, step is as follows:
One, the full titanium pipe close closure titanium pipe two ends mouth of pipe is used;
Two, the GTAW technique full titanium pipe close and the titanium pipe mouth of pipe respectively to titanium pipe two ends is used to carry out seal weld Connect;
Three, vacuum foam leakage detection apparatus butt welded seam is utilized to carry out leak check.
The present invention compared with prior art has the effect that
Use full titanium pipe close that the titanium pipe two ends mouth of pipe is implemented closure, it is simple to follow-up line up and the welding operation of pipe close;Adopt Argon tungsten arc process welds full titanium pipe close and the titanium pipe mouth of pipe by hand, hydrogen, oxygen, nitrogen, carbon etc. when can be prevented effectively from sealing welding Impact on titanium, is effectively ensured quality of weld joint, effectively solves titanium pipe and the on-the-spot welding problem of pipe close;Utilize vacuum foam Leakage detection apparatus carries out leak check, and titanium pipe closure sealing can be confirmed in advance, with existing conventional plugging method phase Ratio, the pipe close of titanium pipe closure non-loosening or possibility of coming off when follow-up unit longtime running, alleviate proceeding in quality control link Pressure, detection methods easily operates, it is ensured that Condenser Titanium Tube closure quality and sealing, ensure that nuclear power plant condenser is follow-up Stable operation.
Accompanying drawing explanation
Fig. 1 is the main cross-sectional schematic of full titanium pipe close;
Fig. 2 is that full titanium pipe close blocks titanium pipe schematic diagram;
Fig. 3 is that full titanium pipe close welds schematic diagram with the titanium seal of tube;
Fig. 4 is the structural representation (comprising two water separators) of vacuum foam leakage detection apparatus.
Detailed description of the invention
Detailed description of the invention one: combine Fig. 1~Fig. 4 and present embodiment is described, the one of present embodiment is used for condenser The plugging method of titanium pipe, step is as follows:
One, full titanium pipe close 1 is used to block the titanium pipe 2 two ends mouth of pipe;
Two, the GTAW technique full titanium pipe close 1 and titanium pipe 2 mouth of pipe respectively to titanium pipe 2 two ends is used to carry out close Soldering and sealing connects;
Three, vacuum foam leakage detection apparatus butt welded seam is utilized to carry out leak check.
Use the plugging method that the present invention provides, in time the Condenser Titanium Tube 2 leakage occur can be implemented closure.
The present invention is after revealing occurs in nuclear power plant's Condenser Titanium Tube 2, it is possible to the Condenser Titanium Tube 2 of leakage is implemented closure And guarantee plugging quality, quickly eliminate condenser source of leakage, can effectively check plugging quality, it is to avoid due to full titanium pipe close simultaneously 1 defective with titanium pipe 2 mouth of pipe weldquality causes Condenser Titanium Tube 2 the most again to be revealed.
Titanium has bigger chemism, and under high temperature, titanium is very strong with the affinity of hydrogen, oxygen, nitrogen, carbon etc., and unshielded titanium exists Starting to inhale hydrogen for more than 300 DEG C, more than 600 DEG C start oxygen uptake, and more than 700 DEG C start to inhale nitrogen.This getter action of titanium will cause Plastic property of weld bead, toughness decline, even brittle cracking, bring the biggest difficulty to welding.In order to make the high temperature position of weldment exempt from The pollution of the impurity such as hydrogen, oxygen, nitrogen, carbon, must take the protective measure of necessity, the full titanium pipe close 1 of present invention use and titanium during welding Pipe 2 seals welding and uses GTAW technique, can be prevented effectively from the shadow to titanium such as hydrogen, oxygen, nitrogen, carbon when sealing welding Ring, it is ensured that seal welding quality, effectively solve titanium pipe 2 and the on-the-spot welding problem of full titanium pipe close 1.
Detailed description of the invention two: combine Fig. 1~Fig. 3 illustrate present embodiment, described full titanium pipe close 1 include guide section 1-1, Seal section 1-2 and spacing section of 1-3, guide section 1-1 and spacing section of 1-3 are respectively and fixedly connected to the two ends of seal section 1-2, guide section 1-1 With titanium pipe 2 endoporus matched in clearance, seal section 1-2 and titanium pipe 2 endoporus interference fit, spacing section of 1-3 is positioned at titanium pipe 2 end.So Design, guide section 1-1 play the guiding role when full titanium pipe close 1 fills in titanium pipe 2 pore, and seal section 1-2 joins with titanium pipe 2 pore interference Closing to ensure sealing, spacing section of 1-3 plays position-limiting action after full titanium pipe close 1 fills in titanium pipe 2 pore.Other forms and is connected pass It is identical with detailed description of the invention one.
Detailed description of the invention three: combining Fig. 1~Fig. 3 and present embodiment is described, one end of described full titanium pipe close 1 offers recessed Groove 1-4, the bottom of groove 1-4 offers blind hole 1-5, the diameter of the blind hole 1-5 diameter less than groove 1-4.It is so designed that, will be complete After the guide section 1-1 of titanium pipe close 1 is inserted in titanium pipe 2, punching pin 100 is used to impact bottom groove 1-4, thus by full titanium pipe close 1 Squeezing in titanium pipe 2 pore, make seal section 1-2 and titanium pipe 2 endoporus interference fit, blind hole 1-5 rises when punching pin impacts full titanium pipe close To guide effect, it is ensured that full titanium pipe close uniform force.Other composition is identical with detailed description of the invention two with annexation.
Detailed description of the invention four: combine Fig. 4 and illustrate that present embodiment, described vacuum foam leakage detection apparatus include vacuum pump 3- 1, inlet valve 3-2, leak valve 3-3, the first vacuum tube 3-41, the second vacuum tube 3-42, four-way pipe 3-13, vacuum meter 3-5, bleed Valve 3-6, mixing cover 3-7, vacuum foam agent container 3-8, butterfly valve 3-9 and water separator 3-10, mixing cover 3-7 covers on and has blocked On titanium pipe 2 mouth of pipe and some titanium pipe 2 mouths of pipe not blocked about, and opening and the condenser steam pipe plate 101 of 3-7 is covered in mixing Being in close contact, vacuum foam agent container 3-8 is connected with the upper end mixing cover 3-7 by conveying pipe 3-11 and foaming agent control valve 3-12 Logical, the lower end of mixing cover 3-7 is separated from water device 3-10 by the first vacuum tube 3-41 and connects, and four mouths of pipe of four-way pipe 3-13 divide It is not connected with one end, vacuum meter 3-5, extraction valve 3-6 and the water separator 3-10 of the second vacuum tube 3-42, and butterfly valve 3-9 is arranged Between one end and four-way pipe 3-13 of the second vacuum tube 3-42, the other end of the second vacuum tube 3-42 by inlet valve 3-2 with Vacuum pump 3-1 connects, and is additionally provided with leak valve 3-3 between inlet valve 3-2 and vacuum pump 3-1.Being so designed that, inlet valve 3-2 is Check valve, plays protection vacuum system and the effect of vacuum pump, and leak valve 3-3 plays the effect of protection vacuum pump, water separator 3-10 can remove the aqueous water in air, it is to avoid during evacuation, water enters vacuum pump and affects vacuumizing effect, mixing cover 3-7 Can be circular arc, it is also possible to for semi-cylindrical, it is also possible to for up big and down small half cone-shaped, the leak test after welding Time, it would be desirable to titanium pipe 2 nose end carrying out hunting leak installs vacuum foam leakage detection apparatus, is covered on by mixing cover 3-7 therein and seals On stifled titanium pipe 2 mouth of pipe and some titanium pipe 2 mouths of pipe not blocked about, mixed with vacuum foam leakage detection apparatus on titanium pipe 2 Close the other end mouth of pipe that titanium pipe 2 mouth of pipe in cover 3-7 is relative, use individually mixing cover 3-7 to cover, start vacuum pump 3-1, logical Crossing the effect of vacuum, the mixing cover 3-7 absorption tightly at titanium pipe 2 two ends, on two ends condenser tube sheet 101, observes vacuum meter 3- 5, when vacuum reaches in the range of-0.094~-0.08MPa, close butterfly valve 3-9 and vacuum pump 3-1 successively, open foaming agent Control valve 3-12, makes foaming agent water solution be sprayed on the pipe close 1 blocked and titanium pipe 2 mouth of pipe weld seam, and mixing cover 3-7 is transparent Cover body, observes commissure by mixing cover 3-7, if commissure acomia bubble out existing, or foaming occurs but size is unchanged, then weld seam There is not the situation of leakage;If full titanium pipe 2 fill in 1 and the commissure of titanium pipe 2 mouth of pipe occur what continuous foamed or foaming persistently increased Situation, then there is the problem revealed in this weld seam, need to again weld, and need to again carry out vacuum after being removed by commissure weld defect Foaming leak detection, until qualified.After vacuum foam leak detection is qualified, opens extraction valve 3-6 and introduce air, true in eliminating mixing cover 3-7 Sky also takes off mixing cover 3-7.
Wherein water separator 3-10 can be two, and the upper end of each water separator 3-10 is respectively provided with a vacuum meter 3-5 And an extraction valve 3-6, vacuum meter 3-5 and extraction valve 3-6 are separated from water device 3-10 by four-way pipe 3-13 and connect, the second vacuum One end of pipe 3-4 by tee T 3-14 and two water separator 3-10 connections, tee T 3-14 and two four-way pipe 3-13 it Between a butterfly valve 3-9 is respectively set, when carrying out leak detection operation, uses one water separator 3-10, one end of the first vacuum tube 3-4 and One water separator 3-10 connects, and is closed by the butterfly valve 3-9 of another water separator 3-10 upper end, when needs use another water During separator 3-10, the butterfly valve 3-9 of the water separator 3-10 upper end used before closedown, by one end of the first vacuum tube 3-41 even Receive on another water separator 3-10, open the butterfly valve 3-9 on another water separator 3-10, can use.Other composition Identical with annexation and detailed description of the invention one, two or three.
Detailed description of the invention five: combine Fig. 1~Fig. 3 and present embodiment, a kind of plugging side for Condenser Titanium Tube are described In method,
Full titanium pipe close 1 is used to block the titanium pipe two ends mouth of pipe described in step one method particularly includes:
1) cleannes are controlled: titanium pipe 2 inner chamber is rinsed well with pure water by the titanium pipe 2 of required plugging, treats that tube chamber is dried Titanium pipe 2 end of plugging is needed, simultaneously with washes of absolute alcohol full titanium pipe close 1 with washes of absolute alcohol;
2) full titanium pipe close 1 is used to implement closure: to be placed in titanium pipe 2 pore by full titanium pipe close 1, and withstand on punching pin 100 The groove 1-4 bottom of full titanium pipe close 1 one end, beats full titanium pipe close 1 in titanium pipe 2 pore, gently when full titanium pipe close 1 end face (firmly can not be excessive during percussion, in order to avoid affecting the circularity of adjacent tubes) be beaten with termination during titanium pipe 2 end face;
3) clean: use anhydrous ethanol solvent titanium pipe 2 surrounding tube sheet 101 plate to full titanium pipe close 1 end face and required plugging Face is carried out, remove need to carry out the surface impurity of welding position (prevent from affecting welding quality, surface impurity include greasy dirt, Rust, moisture content).Other composition is identical with detailed description of the invention four with annexation.
Detailed description of the invention six: combine Fig. 1~Fig. 3 and present embodiment, a kind of plugging side for Condenser Titanium Tube are described In method,
The GTAW technique full titanium pipe close 1 and titanium pipe 2 mouth of pipe respectively to titanium pipe two ends is used described in step 2 Carrying out sealing in welding, the requirement for welding procedure and welding quality is:
1) selection of welding procedure: use ERTi 2 pure titanium welding wire, welding wire specification uses φ 1.0mm or φ 1.2mm, welding Time electric current select 80~100A, polarity is straight polarity direct current, and protective gas is argon;
ERTi-2 trade mark titanium welding wire (component of weld wire is shown in Table 1) in AWS A5.16 standard.Owing to ERTi-2 welding wire has good Intensity and welding performance, apply widely in the industry, and ERTi-2 titanium welding wire is commonly used for the pure titanium of welding industry.ERTi-2 welds Silk is when welding, and owing in titanium alloy, the impurity content such as S, P, C is less, the low melting point eutectic that S, p-shaped become is difficult to occur in crystal boundary On, adding that effective crystallization interval is narrow, during titanium alloy solidification, amount of contraction is little, and weld metal is not likely to produce fire check, i.e. welds The probability of the fire check that joint produces is the least;
The composition of the ERTi-2 titanium welding wire that table 1 seal weld uses
During welding, welding wire and argon being desirable that the lowest hydrogen content, there is crackle in hydrogen after being easily caused welding, institute so that The welding wire the lowest with hydrogen content and high purity argon, it is possible to when avoiding welding, hydrogen causes crackle.
Argon electric arc feature is that arc draws the energy of inner core higher, and appearance energy is relatively low, and produced welding bead is that mamillary melts Shape thoroughly.Full titanium pipe close 1 and titanium tube of thin wall 2 welding requirements are the welding bead molding melting narrow width, therefore use pure argon as guarantor Protect gas to be more suitable for;High purity argon is used, it is to avoid during welding, absorb the impurity such as oxygen, nitrogen and hydrogen in argon during welding Gas and cause weld contamination brittle (argon composition is shown in Table 2).
The argon composition used when table 2 welds
2) welding quality requires: the face of weld of full titanium pipe close 1 and titanium pipe 2 mouth of pipe should be uniform, attractive in appearance, and face of weld is without splitting The defects such as stricture of vagina, pore, incomplete fusion, face of weld color must not occur that purple, black, blueness, weld seam dyeing inspection must not exist Any defect shows.Other composition and annexation and detailed description of the invention one, two, three or five are identical.
Detailed description of the invention seven: combine Fig. 1~Fig. 4 and present embodiment, a kind of plugging side for Condenser Titanium Tube are described In method,
The vacuum foam leakage detection apparatus butt welded seam that utilizes described in step 3 carries out concretely comprising the following steps of leak check:
1) start vacuum pump 3-1, check and confirm each composition coupling part No leakage, and observe vacuum meter 3-5 total indicator reading The vacuum of more than-0.094MPa can be maintained at, after confirming no problem, close vacuum pump 3-1;
2) vacuum foam inspection: titanium pipe 2 nose end carrying out needs hunting leak installs vacuum foam leakage detection apparatus, will wherein Mixing cover 3-7 cover on titanium pipe 2 mouth of pipe blocked and some titanium pipe 2 mouths of pipe not blocked about, with true on titanium pipe 2 The other end mouth of pipe that in empty foaming leakage detection apparatus, titanium pipe 2 mouth of pipe in mixing cover 3-7 is relative, uses individually mixing cover 3-7 cover Live;
Starting vacuum pump 3-1, by the effect of vacuum, the mixing cover 3-7 absorption tightly at titanium pipe 2 two ends is at two ends condensing On device tube sheet 101, observe vacuum meter 3-5, when vacuum reaches in the range of-0.094~-0.08MPa, close butterfly valve 3-successively 9 and vacuum pump 3-1, open foaming agent control valve 3-12, make foaming agent water solution be sprayed on the full titanium pipe close 1 and titanium pipe blocked On 2 mouth of pipe weld seams, it is ensured that foaming aqueous solution is completely covered weld seam;
Mixing cover 3-7 is transparent cover, in the range of in mixing cover 3-7, vacuum maintains-0.094~-0.08MPa, logical Cross mixing cover 3-7 and observe commissure, if commissure acomia bubble out existing, or foaming occurs but size is unchanged, then weld seam does not exists Situation about revealing;If there is the situation that continuous foamed or foaming persistently increases in the commissure of full titanium pipe close 1 and titanium pipe 2 mouth of pipe, then There is the problem revealed and (again weld after needing after finding leakage to remove commissure weld defect, and need to again carry out in this weld seam Vacuum foam is hunted leak, until qualified);
3) after vacuum foam has been hunted leak, open extraction valve 3-6 and introduce air, eliminate vacuum taking off in mixing cover 3-7 Mixing cover 3-7.
4) clean: use the condenser tube sheet 101 plate face around dehydrated alcohol titanium pipe 2 pore to being blocked and full titanium pipe The foaming agent filled on 1 end face thoroughly cleans.Other composition is identical with detailed description of the invention six with annexation.
Detailed description of the invention eight: combine Fig. 1~Fig. 4 and illustrate that present embodiment, Cooling Tubes of Condenser all use with tube sheet 101 Industrially pure titanium, the most full titanium condenser, titanium pipe 2 two ends expanded and welded tube joint, on tube sheet 101, supports by sagging plate 101, and titanium pipe 2 is The Thin Wall Welded Ti Pipe 2 of material Gr.2 in standard ASME SB338, occur leakage titanium pipe 2 external diameters × wall thickness be 25.4mm × 0.5mm, internal diameter is 24.4mm, and the full titanium pipe close 1 a diameter of 24.1mm of guide section 1-1 of plugging (is slightly less than titanium pipe 2 pore internal diameter 24.4mm), the full titanium pipe close 1 a diameter of 24.45mm of seal section 1-2 (with pore internal diameter interference fit, it is ensured that sealing), pipe close limits The position a diameter of 25.5mm of section 1-3 (compared with the titanium pipe 2 big 0.1mm of external diameter, play position-limiting action after pipe close is filled in), the groove 1-4 of pipe close Internal diameter is 22.45mm.

Claims (7)

1. the plugging method for Condenser Titanium Tube, it is characterised in that: step is as follows:
One, full titanium pipe close (1) closure titanium pipe (2) the two ends mouth of pipe is used;
Two, the GTAW technique full titanium pipe close (1) and titanium pipe (2) mouth of pipe respectively to titanium pipe (2) two ends is used to carry out Seal welding;
Three, vacuum foam leakage detection apparatus butt welded seam is utilized to carry out leak check.
A kind of plugging method for Condenser Titanium Tube the most according to claim 1, it is characterised in that: described full titanium pipe close (1) including guide section (1-1), seal section (1-2) and spacing section (1-3), guide section (1-1) and spacing section (1-3) are respectively and fixedly connected with At the two ends of seal section (1-2), guide section (1-1) and titanium pipe (2) endoporus matched in clearance, seal section (1-2) and titanium pipe (2) endoporus Interference fit, spacing section (1-3) is positioned at titanium pipe (2) end.
A kind of plugging method for Condenser Titanium Tube the most according to claim 2, it is characterised in that: described full titanium pipe close (1) one end offers groove (1-4), and the bottom of groove (1-4) offers blind hole (1-5), and the diameter of blind hole (1-5) is less than recessed The diameter of groove (1-4).
4. according to a kind of plugging method for Condenser Titanium Tube described in claim 1,2 or 3, it is characterised in that: described very Empty foaming leakage detection apparatus includes vacuum pump (3-1), inlet valve (3-2), leak valve (3-3), the first vacuum tube (3-41), second true Blank pipe (3-42), vacuum meter (3-5), extraction valve (3-6), mixing cover (3-7), vacuum foam agent container (3-8), butterfly valve (3-9) And water separator (3-10), mixing cover (3-7) covers on titanium pipe (2) mouth of pipe blocked and some titanium pipes not blocked about (2) on the mouth of pipe, and the opening of mixing cover (3-7) is in close contact with condenser steam pipe plate (101), vacuum foam agent container (3-8) Connected with the upper end of mixing cover (3-7) by conveying pipe (3-11) and foaming agent control valve (3-12), the lower end of mixing cover (3-7) By the first vacuum tube (3-41) be separated from water device (3-10) connect, four mouths of pipe of four-way pipe (3-13) respectively with the second vacuum The pipe one end of (3-42), vacuum meter (3-5), extraction valve (3-6) and water separator (3-10) connect, and butterfly valve (3-9) is arranged on Between one end and the four-way pipe (3-13) of the second vacuum tube (3-42), the other end of the second vacuum tube (3-42) passes through inlet valve (3-2) it is connected with vacuum pump (3-1), between inlet valve (3-2) and vacuum pump (3-1), is additionally provided with leak valve (3-3).
A kind of plugging method for Condenser Titanium Tube the most according to claim 4, it is characterised in that: a kind of for condensing In the plugging method of device titanium pipe,
Full titanium pipe close (1) the closure titanium pipe two ends mouth of pipe is used described in step one method particularly includes:
1) cleannes are controlled: titanium pipe (2) inner chamber is rinsed well with pure water by the titanium pipe (2) of required plugging, treats that tube chamber is dried Titanium pipe (2) end of plugging is needed, simultaneously with washes of absolute alcohol full titanium pipe close (1) with washes of absolute alcohol;
2) full titanium pipe close (1) is used to implement closure: full titanium pipe close (1) to be placed in titanium pipe (2) pore, and with punching pin (100) Withstand on groove (1-4) bottom of full titanium pipe close (1) one end, full titanium pipe close (1) is beaten in titanium pipe (2) pore gently, when entirely Terminate when titanium pipe close (1) end face and titanium pipe (2) end face beaing;
3) clean: use anhydrous ethanol solvent titanium pipe (2) tube sheet (101) around to full titanium pipe close (1) end face and required plugging Plate face is carried out, and removes and needs the surface impurity carrying out welding position.
6. according to a kind of plugging method for Condenser Titanium Tube described in claim 1,2,3 or 5, it is characterised in that: a kind of In the plugging method of Condenser Titanium Tube,
The GTAW technique full titanium pipe close (1) and titanium pipe (2) mouth of pipe respectively to titanium pipe two ends is used described in step 2 Carrying out sealing in welding, the requirement for welding procedure and welding quality is:
1) selection of welding procedure: use ERTi 2 pure titanium welding wire, welding wire specification uses φ 1.0mm or φ 1.2mm, electricity during welding Stream selects 80~100A, and polarity is straight polarity direct current, and protective gas is argon;
2) welding quality requires: the face of weld of full titanium pipe close (1) and titanium pipe (2) mouth of pipe should be uniform, attractive in appearance.
A kind of plugging method for Condenser Titanium Tube the most according to claim 6, it is characterised in that: a kind of for condensing In the plugging method of device titanium pipe,
The vacuum foam leakage detection apparatus butt welded seam that utilizes described in step 3 carries out concretely comprising the following steps of leak check:
1) start vacuum pump (3-1), check and confirm each composition coupling part No leakage, and observe vacuum meter (3-5) total indicator reading The vacuum of more than-0.094MPa can be maintained at, after confirming no problem, close vacuum pump (3-1);
2) vacuum foam inspection: titanium pipe (2) nose end carrying out needs hunting leak installs vacuum foam leakage detection apparatus, by therein Mixing cover (3-7) covers on titanium pipe (2) mouth of pipe blocked and some titanium pipe (2) mouths of pipe not blocked about, titanium pipe (2) The other end mouth of pipe that upper and in mixing cover (3-7) in vacuum foam leakage detection apparatus titanium pipe (2) mouth of pipe is relative, uses the most mixed Close cover (3-7) to cover;
Starting vacuum pump (3-1), by the effect of vacuum, the absorption tightly of the mixing cover (3-7) at titanium pipe (2) two ends is solidifying at two ends On vapour device tube sheet (101), observe vacuum meter (3-5), when vacuum reaches in the range of-0.094~-0.08MPa, close successively Butterfly valve (3-9) and vacuum pump (3-1), open foaming agent control valve (3-12), makes foaming agent water solution be sprayed on blocked complete On titanium pipe close (1) and titanium pipe (2) mouth of pipe weld seam, it is ensured that foaming aqueous solution is completely covered weld seam;
Mixing cover (3-7) is transparent cover, in the range of mixing cover (3-7) interior vacuum maintains-0.094~-0.08MPa, logical Cross mixing cover (3-7) and observe commissure, if commissure acomia bubble out existing, or foaming occurs but size is unchanged, then weld seam is not deposited In situation about revealing;If there are the feelings that continuous foamed or foaming persistently increases in the commissure of full titanium pipe close (1) and titanium pipe (2) mouth of pipe Condition, then there is the problem revealed in this weld seam;
3) after vacuum foam has been hunted leak, open extraction valve (3-6) and introduce air, eliminate mixing cover (3-7) interior vacuum and take off Mixing cover (3-7).
4) clean: use condenser tube sheet (101) the plate face around dehydrated alcohol titanium pipe (2) pore to being blocked and full titanium pipe Foaming agent on plug (1) end face thoroughly cleans.
CN201610686082.9A 2016-08-18 2016-08-18 A kind of plugging method for Condenser Titanium Tube Active CN106270960B (en)

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