CN102554550B - Method for rapidly repairing defects of finned tube module of waste heat boiler - Google Patents
Method for rapidly repairing defects of finned tube module of waste heat boiler Download PDFInfo
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- CN102554550B CN102554550B CN201010597136.7A CN201010597136A CN102554550B CN 102554550 B CN102554550 B CN 102554550B CN 201010597136 A CN201010597136 A CN 201010597136A CN 102554550 B CN102554550 B CN 102554550B
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Abstract
The invention relates to a method for rapidly repairing defects of a finned tube module of a waste heat boiler, which includes the steps: 1 judging the position of a defective tube of the finned tube module, judging a system or module with a leakage point and determining a peripheral duct needing to be cut by means of visual examination outside a furnace and operational data analysis; 2 stripping fins of a heated tube and finding the specific position of the defective tube; 3 cutting off the section of the defective tube according to the position of the module with the defective tube; 4 replacing the section of the defective tube in an inserted manner, performing argon-arc backing weld by an internal wire filling method, and controlling the weld quality of a backing layer by a welder through end clearance; and 5 inspecting quality after welding and thoroughly removing slag and splash after welding until passing inspection. The method can be used for rapidly stripping the fins without hoisting the module, avoiding damage to a body of the finned tube, more rapidly cutting the section of the defective tube and realizing argon filling tightness in the finned tube module of the waste heat boiler.
Description
Technical field
The present invention relates to a kind of method of quick reparation defects of finned tube module of waste heat boiler, belong to power generation industries and auxiliary device technical field field.
Background technology
At present, send along with the western gas east of China and introduce LNG abroad, steam-gas combined cycle unit starts a large amount of operations of putting into production.Meanwhile, due to the technical policy that country is relevant, the waste heat boiler be equipped with the Combined Cycle Unit overwhelming majority is produced after domestic manufacturer's introduction of foreign technology.According to external relevant theory, extended surface tube is disposable apparatus by thermal modules, generally can not leak in lifetime, therefore there is no recovery technique and the record of extended surface tube heating surface defect abroad.But according to waste heat boiler this ruuning situation in several years at home, the event that extended surface tube heating surface occurs to leak happens occasionally.According to these several years domestic power plant, defect occurs to analyze, mainly some reason following causes extended surface tube heating surface to leak:
1) large-scale residual heat boiler configured with steam-gas combined cycle unit is the domestic Design and manufacture of introduction of foreign technology first, digestion and innovation ability deficiency, certainly exist many problems, as: do not take into full account that combustion engine exhaust flow rate causes comparatively greatly vibration and the friction problem of front several module (particularly module 1).Heating surface pipe is easily caused to damage and leak; To waste heat boiler and combustion engine operation characteristic unclear, design too theorize, cause working media assignment of traffic uneven, easily cause overtemperature tube burst; Totally introduce by foreign standard, variant with domestic current standard, cannot carry out sufficient preventive inspection, easily meet accident leakage accident etc.
2) external unit is band base load operation mode; China is then long-term two-shift operation; for the world is initiated; start, shut down speed more faster than coal unit with the speed of ascending, descending load; rate temperature change is very large; large to the test of material and architectural characteristic (helix fin as all densely covered in whole heating surface pipe), the new problem that temperature alternating stress, fatigue rupture etc. cause will be inevitable.
3) problem of materials: for meeting the operational factor requirement of waste heat boiler, ensures boiler life and quality, and when current material technology cannot meet at home, boiler for producing producer of China all uses external imported material when manufacturing waste heat boiler.But imported material is because the factor such as the mode of production and the place of production, there will be material property cannot meet instructions for use, causes extended surface tube heating surface generation defect.
4) absorption of technology of waste heat boiler manufacturing enterprise welding procedure and quality control aspect is inadequate with digestion, causes finned tube module to there is fabrication and installation defect, leaks in production run.
In the prior art, waste heat boiler heating surface of boiler proper adopts N/E standard design modular structure, is divided into 6 modules, and each module is made up of, to obtain best heat-transfer effect and minimum flue gas pressure drop along row spiral finned tube and import and export header vertically arranged.The flue gas that gas turbine is discharged enters boiler body by inlet flue duct, and horizontal cross washes away each heating surface module successively, then is discharged by main chimney through exhaust pass.Due to the restriction of traffic condition, this boiler in the width direction each heating surface module is divided into three tube panel modules, each modular design devises 8-16 along flue gas flow direction and arranges fin pipe, pipe all adopts tooth punching helix fin tubular construction, between each module tube and tube, closely, the gap of fin is less than 5mm in (comprising fin) connection.Each tube panel is suspended on crossbeam, and top and the bottom header of module have installed gas baffle, prevent flue gas short circuit.
This kind of structure brings very large difficulty with regard to giving the service work of finned tube module, and the intensive layout of extended surface tube, tube and tube spacing is quite little.Because heating surface fin gap is less than 5mm, not only instrument cannot go deep into, and sight line also can be blocked, once finned tube module leaks, confirm occur defect tracking position, carry out pipe cutting, welding and gold inspection work difficulty quite large.Just in case there is quick-fried leakage at unfavorable position (in the middle of module), then can execute without good plan, can only carry out according to the method for erection stage the manpower and materials processing (need hang out module), at substantial, the repair time is very long, substantially reaches two weeks.
Summary of the invention
Object of the present invention, to solve the problem cannot repaired defects of finned tube module of waste heat boiler in prior art, a kind of method of quick reparation defects of finned tube module of waste heat boiler is provided, adopt the method without the need to carrying out module hoisting, can realize divesting fin fast, and damage can not be caused to extended surface tube pipe shaft; Defect pipeline section can be cut sooner, and the sealing of argon filling can be realized in finned tube module of waste heat boiler.
Object of the present invention can be reached by following measure:
A method for quick reparation defects of finned tube module of waste heat boiler, its feature is to comprise the following steps:
1) position of the defect pipe of finned tube module is tentatively judged: the first step: by the outer visual examination of stove and Operational Data Analysis, first judge leak source said system or module, determine the pipeline that periphery should be cut;
2) divesting heat pipe fin, find out the particular location of defect pipe: first, with cutting machine parallel heat pipe radial cuts fin, without the need to switching to fin roots, only needing pipe radial cuts to fin about 4/5 degree of depth; Axially knock fin with short drill rod along caliber, pull up with hand vice after fin gets loose and press from both sides out; Divest after fin forms about 4cm space, down knock fin with drill rod along tube wall, fin can get loose by nature, then takes out the fin got loose with hand vice, finds out defect pipe after having cleared up fin;
The method divesting heat pipe fin needs the position according to module, pipe way apart from determining.Tradition adopts gas cutting and abrasive wheel cutting machine to peel off.But through test, adopt the method for gas cutting, be difficult to do not damage pipe mother metal and cut clean all fins, or because flame temperature is too high, pipe and fin heated, cause melt to stick together, take out more difficult; Because root cannot thoroughly Ex-all, cause fin residual fraction more, gap is less, until the 3rd row then again cannot cut, thus cannot determine leak source.If cut with conventional abrasive wheel cutting machine, because emery wheel external diameter is usually more than 150mm, for most module, be greater than the fin height sum of two pipes, therefore fragile mother metal.Meanwhile, due to grinding wheel broken (fin too many, unbalance stress) easy to break, cut inner row's time space limited, even if use reciprocating saw, there will be the problems referred to above equally, therefore, need to study more suitably instrument and method.
By analysis, the processing technology of waste heat boiler boiler tooth punching used spiral finned tube on seamless steel pipe outer surface, is wound around tooth punching steel band by certain pitch and keeps vertical, by kelvin effect and the electrocaloric effect of high frequency electric, the contact surface of local heat steel pipe and steel band, realizes the plasticity welding of contact surface.I.e. waste heat boiler extended surface tube being directly welded on heat pipe unlike conventional boiler extended surface tube.The experiment proved that the connection of fin and heat pipe is not very fastening.
Through test of many times, we adopt step 2 now) in method can divest rapidly the fin of extended surface tube.The benefit done like this is: one, speed is fast, saves for 50% time than conventional method; Two, divest effective, fin peels off completely, the fin of heat pipe face noresidue, there will not be that more to arrive rear of tube fin residual fraction more, and gap is less, causes the situation again cannot cutting fin to occur in the middle of module because space is too small; Three, because fin cutting carries out along pipe radial direction, can not occur because heat pipe blocks the situation causing cutting machine to stretch into; Can not heat pipe be hurt when four, peeling off fin, no matter cut or knock, all carry out on fin, and pipe being contactless, easily as Normal practice can not hurt heat pipe, cause new hidden danger and defect to occur.
3) cut off defect pipeline section: according to the module position at defect pipe place, use reciprocating saw, oppositely cut off by the form of " 1-1-3-3-5-5 "; The form of described " 1-1-3-3-5-5 " refers to: if defect pipe is at second row, then outermost row only need cut a heat pipe, just can carry out pipe maintenance work, if pipe is the 3rd row, then outermost need cut 3 pipes just can have sufficient space to carry out maintenance work; Due to space problem, time maximum, outermost layer also only need cut 5 pipes, and welder just can stretch into and carry out maintenance work by health;
4) plug-in type changes defect pipeline section: a) adopt interior silk filling method to carry out argon arc backing weld and connect, by alignment clearance, welder can control prime coat weldquality; B) filling and the welding of capping layer, take people's welding, a people coordinates the way with little sem observation; Control capping layer weldquality; C) excise defect fin pipeline section, change a new pipe and weld two weld bonds, adopt novel argon-filling device to solve argon filling sealing problem;
5) welded rear quality inspection: postwelding thoroughly removes slag and splash, used hand magnifier inspection, this type of weld defect of crackle, pore, slag inclusion can not have been had; Otherwise adopt electric angle grinder polishing, again weld, until passed examination after removing weld defect.
Object of the present invention can also be reached by following measure:
One embodiment of the present invention are: in step 1) in, when the first step cannot judge defects of finned tube module position, judge in conjunction with second step, as described below: the speed utilizing each system pressure or temperature to decline is different, open manhole to observe, judge pipe belonging to leak source and general height; If desired, properly protect measure, comprises high dish and purge, accelerate burner hearth cooling; Observe (each 1h is generally 2 times) for several times, positive opening flue gas plate washer, keeps the draft to burner hearth, opens corresponding manhole door, inwards visual, listen attentively to; Coordinated operation personnel, note pressurize or build the pressure consciously, wherein, centering presses through vapours system, manual intervention operated valve when also can take to run, pours in down a chimney steam to coordinate leakage detection by auxiliary vapour or high-pressure superheater;
One embodiment of the present invention are: in step 1) in, vapour system may because of various unexpected and to cause pressure release too fast, when leak source position cannot be found by the above-mentioned first step and second step, then air testing method, water pressure test method or steam test method must be adopted to search.
One embodiment of the present invention are: in step 4) in, described novel argon-filling device has a bend pipe, and bend pipe adopts flat tube, thus makes bend pipe can fill in very little weld seam; The two ends up and down that extended surface tube inwall is positioned at weld bond are respectively equipped with the blocking cup made with the water soluble paper, and when rushing argon gas in pipe, argon gas can not be escaped along pipeline, ensure to complete welding job under argon shield.
The invention has the beneficial effects as follows:
1, the quick reparation of defects of finned tube module of waste heat boiler is realized; Without the need to carrying out module hoisting.
2, innovate formula extended surface tube fin process for stripping, have the following advantages: one, speed is fast, saves for 50% time than conventional method; Two, divest effective, fin peels off completely, the fin of heat pipe face noresidue, there will not be that more to arrive rear of tube fin residual fraction more, and gap is less, causes the situation again cannot cutting fin to occur in the middle of module because space is too small; Three, because fin cutting carries out along pipe radial direction, can not occur because heat pipe blocks the situation causing cutting machine to stretch into; Can not heat pipe be hurt when four, peeling off fin, no matter cut or knock, all carry out on fin, and pipe being contactless, easily as Normal practice can not hurt heat pipe, cause new hidden danger and defect to occur.
3, be different from traditional cutting mode, cut defect pipeline section sooner.Conventional pipe cutting method adopts gas cutting, this be the most fast, the simplest method, but operating personnel are required high, must by technical operation that is senior, that be skilled in technique, in order to avoid damage contiguous pipe; And for some material finned tube module, tubing is unfavorable for gas cutting more firmly.Also can be less than with grinding wheel external diameter the minitype cutting machine that caliber adds tube pitch to cut, be performed by experienced pincers worker, otherwise easily cause the damage to adjacent tube; But require cutter special like this, and if extended surface tube caliber comparatively large, then because grinding wheel is less, the back side of extended surface tube cannot be cut to.Compare through test, use reciprocating saw cutting effect better, requisite space is little, caliber also can complete cutting comparatively greatly, and directly can cut on extended surface tube due to reciprocating saw, and the fin of scarfing position need divest and just can to come into operation afterwards by cutting machine, can save maintenance time.
4, unique argon-filling device, realizes the sealing of argon filling in finned tube module of waste heat boiler.
Accompanying drawing explanation
Fig. 1 a, Fig. 1 b, Fig. 1 c are that the fin that divests of the specific embodiment of the invention cuts schematic diagram.
In figure: 1 is heat pipe; 2 is fin; 3 is abrasive machine; 4 is drill rod.
Fig. 2 is the structural representation of the novel argon-filling device of the specific embodiment of the invention.
In figure: 1 is heat pipe; 2 is fin; 5 is weld bond; 6 is argon-filling device; 7 is blocking cup.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail:
Specific embodiment 1:
Now with the maintenance of certain finned tube module of waste heat boiler (defect pipe is positioned at the 3rd row), a kind of method having quick reparation defects of finned tube module of waste heat boiler described in the present embodiment is described, carries out according to the following steps successively:
1) adopting water pressure test method, probably judging the position of defects of finned tube module by observing to leak, can judge that defect is positioned on the 3rd or the 4th row's extended surface tube, determine the pipeline that periphery should be cut.
2) reciprocating saw is used, by first row 3 pipe excisions.
3) reciprocating saw is used, excision second row one pipe.3rd array of pipes has water mark, tentatively judges that defect may on this root extended surface tube.
4) the 3rd row, Fig. 1 a, Fig. 1 b, Fig. 1 c, suspects that defect extended surface tube is along pipe radial cuts, axially knocks fin 2 with short drill rod along caliber, pulls up press from both sides out after fin gets loose with hand vice with abrasive machine.Divest after fin 2 forms about 4cm space, down knock fin 2 with drill rod along tube wall, fin 2 can get loose by nature, then takes out the fin 2 got loose with hand vice.Defect is found out after having cleared up fin.
5) cut off 2, pipe side pipe along pipe radial cuts with abrasive machine at second row extended surface tube, axially knock fin with short drill rod along caliber, pull up with hand vice after fin gets loose and press from both sides out.Divest after fin forms about 4cm space, down knock fin with drill rod along tube wall, fin can get loose by nature, then takes out the fin got loose with hand vice.Divest about 30CM fin.
6) with reference to Fig. 2 a, Fig. 2 b, Fig. 2 c, from joint edge, rejected region segment of tube is oppositely cut off in extended surface tube side with reciprocating saw, then polish to groove dimensional requirement.New pipeline section is also polished to groove dimensional requirement simultaneously.
7) header rework area is about in 200mm and is preheated to 150 DEG C by flame heating means, carries out local back gas shielded by Fig. 4 requirement argon-filling device 6, by new pipeline section and old pipeline section tack welding, and alignment clearance 3-4mm.What ensure welding wire stretches people.
8) select and appoint veteran I class welder by the welding of minute surface imaging welding method, under ensureing that root fuses good prerequisite, adopt less specification to weld the first weld seam, interlayer temperature controls below 300 DEG C as far as possible.Employing specification is AWS A5.28, the ER 90S-B9 welding wire of vertical 2.0nlln, and electric current 100-130A, two layers are soldered.Often be soldered one deck, utilize little mirror to assist in time and carry out visual examination.
9), after docking weld bond 5 completes, back of the body gas shielded device is removed.Soluble paper ring 7 is placed by Fig. 4 requirement.
10), after checking that back of the body gas shielded is all right, carry out the second weld seam assembling and positioning and welding, welding procedure is the same with the first weld seam.
11) when weld seam integral solder is complete, during slow cooling to 100 ~ 120 DEG C, post weld heat treatment is carried out in time, heat treatment heating-up temperature (760 ± 10) DEG C, constant temperature 4h.
12) welded rear quality inspection: postwelding thoroughly removes slag and splash, used hand magnifier inspection, this type of weld defect of crackle, pore, slag inclusion can not have been had; Otherwise adopt electric angle grinder polishing, again weld, until passed examination after removing weld defect.
Specific embodiment 2: the feature of this specific embodiment comprises the following steps:
1) position of the defect pipe of finned tube module is tentatively judged: the first step: by the outer visual examination of stove and Operational Data Analysis, first judge leak source said system or module, determine the pipeline that periphery should be cut;
2) divesting heat pipe fin, find out the particular location of defect pipe: first, with cutting machine parallel heat pipe radial cuts fin, without the need to switching to fin roots, only needing pipe radial cuts to fin about 4/5 degree of depth; Axially knock fin with short drill rod along caliber, pull up with hand vice after fin gets loose and press from both sides out; Divest after fin forms about 4cm space, down knock fin with drill rod along tube wall, fin can get loose by nature, then takes out the fin got loose with hand vice, finds out defect pipe after having cleared up fin;
The method divesting heat pipe fin needs the position according to module, pipe way apart from determining.Tradition adopts gas cutting and abrasive wheel cutting machine to peel off.But through test, adopt the method for gas cutting, be difficult to do not damage pipe mother metal and cut clean all fins, or because flame temperature is too high, pipe and fin heated, cause melt to stick together, take out more difficult; Because root cannot thoroughly Ex-all, cause fin residual fraction more, gap is less, until the 3rd row then again cannot cut, thus cannot determine leak source.If cut with conventional abrasive wheel cutting machine, because emery wheel external diameter is usually more than 150mm, for most module, be greater than the fin height sum of two pipes, therefore fragile mother metal.Meanwhile, due to grinding wheel broken (fin too many, unbalance stress) easy to break, cut inner row's time space limited, even if use reciprocating saw, there will be the problems referred to above equally, therefore, need to study more suitably instrument and method.
By analysis, the processing technology of waste heat boiler boiler tooth punching used spiral finned tube on seamless steel pipe outer surface, is wound around tooth punching steel band by certain pitch and keeps vertical, by kelvin effect and the electrocaloric effect of high frequency electric, the contact surface of local heat steel pipe and steel band, realizes the plasticity welding of contact surface.I.e. waste heat boiler extended surface tube being directly welded on heat pipe unlike conventional boiler extended surface tube.The experiment proved that the connection of fin and heat pipe is not very fastening.
Through test of many times, we adopt step 2 now) in method can divest rapidly the fin of extended surface tube.The benefit done like this is: one, speed is fast, saves for 50% time than conventional method; Two, divest effective, fin peels off completely, the fin of heat pipe face noresidue, there will not be that more to arrive rear of tube fin residual fraction more, and gap is less, causes the situation again cannot cutting fin to occur in the middle of module because space is too small; Three, because fin cutting carries out along pipe radial direction, can not occur because heat pipe blocks the situation causing cutting machine to stretch into; Can not heat pipe be hurt when four, peeling off fin, no matter cut or knock, all carry out on fin, and pipe being contactless, easily as Normal practice can not hurt heat pipe, cause new hidden danger and defect to occur.
3) cut off defect pipeline section: according to the module position at defect pipe place, use reciprocating saw, oppositely cut off by the form of " 1-1-3-3-5-5 "; The form of described " 1-1-3-3-5-5 " refers to: if defect pipe is at second row, then outermost row only need cut a heat pipe, just can carry out pipe maintenance work, if pipe is the 3rd row, then outermost need cut 3 pipes just can have sufficient space to carry out maintenance work; Due to space problem, time maximum, outermost layer also only need cut 5 pipes, and welder just can stretch into and carry out maintenance work by health;
4) plug-in type changes defect pipeline section: a) adopt interior silk filling method to carry out argon arc backing weld and connect, by alignment clearance, welder can control prime coat weldquality; B) filling and the welding of capping layer, take people's welding, a people coordinates the way with little sem observation; Control capping layer weldquality; C) excise defect fin pipeline section, change a new pipe and weld two weld bonds, adopt novel argon-filling device to solve argon filling sealing problem;
5) welded rear quality inspection: postwelding thoroughly removes slag and splash, used hand magnifier inspection, this type of weld defect of crackle, pore, slag inclusion can not have been had; Otherwise adopt electric angle grinder polishing, again weld, until passed examination after removing weld defect.
Other specific embodiments:
The feature of other embodiments of the invention is: with reference to specific embodiment 2,
In step 1) in, when the first step cannot judge defects of finned tube module position, judge in conjunction with second step, as described below: the speed utilizing each system pressure or temperature to decline is different, open manhole and observe, judge pipe belonging to leak source and general height; If desired, properly protect measure, comprises high dish and purge, accelerate burner hearth cooling; Observe for several times, positive opening flue gas plate washer, keeps the draft to burner hearth, opens corresponding manhole door, inwards visual, listen attentively to; Coordinated operation personnel, centering presses through vapours system, manual intervention operated valve when taking to run, pours in down a chimney steam to coordinate leakage detection by auxiliary vapour or high-pressure superheater;
Or in step 1) in, if vapour system is because of various unexpected and to cause pressure release too fast, when leak source position cannot be found by the above-mentioned first step and second step, then adopt air testing method, water pressure test method or steam test method to search;
Or in step 4) in, described argon-filling device has a bend pipe, and bend pipe adopts flat tube, enables bend pipe fill in little weld seam; The two ends up and down that extended surface tube inwall is positioned at weld bond are respectively equipped with the blocking cup made with the water soluble paper;
All the other are identical with specific embodiment 2.
The above; be only the present invention's preferably specific embodiment; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the scope that the present invention discloses; be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, all belonged to protection scope of the present invention.
Claims (4)
1. repair a method for defects of finned tube module of waste heat boiler fast, it is characterized in that comprising the following steps:
1) tentatively judge the position of the defect pipe of finned tube module, by the outer visual examination of stove and Operational Data Analysis, judge leak source said system or module, determine the pipeline that periphery should be cut;
2) divest heat pipe fin, find out the particular location of defect pipe; First, with cutting machine along heat pipe radial cuts fin, depth of cut is 4/5 depth along pipe radial cuts to fin; Axially knock fin with short drill rod along caliber, pull up with hand vice after fin gets loose and press from both sides out; After divesting fin formation 4cm space, down knock fin with drill rod along tube wall, can get loose by nature to fin, then take out the fin got loose with hand vice, after having cleared up fin, find out defect pipe;
3) cut off defect pipeline section, according to the module position at defect pipe place, use reciprocating saw, oppositely cut off by the form of " 1-1-3-3-5-5 "; The form of described " 1-1-3-3-5-5 " refers to: if defect pipe is at second row, then outermost row only need cut a heat pipe, just can carry out pipe maintenance work, if pipe is the 3rd row, then outermost need cut 3 pipes just can have sufficient space to carry out maintenance work;
4) plug-in type changes defect pipeline section, and a) adopt interior silk filling method to carry out argon arc backing weld and connect, by alignment clearance, welder controls prime coat weldquality; B) filling and the welding of capping layer, take people's welding, a people coordinates the way with little sem observation; Control capping layer weldquality; C) excise defect fin pipeline section, change a new pipe and weld two weld bonds, adopt argon-filling device to solve argon filling sealing problem;
5) welded rear quality inspection, postwelding thoroughly removes slag and splash, uses hand magnifier inspection, can not have crackle, pore, slag inclusion weld defect in sealing; If there is aforementioned drawback, adopt electric angle grinder to polish, again weld, until passed examination after removing weld defect.
2., according to the method for a kind of quick reparation defects of finned tube module of waste heat boiler described in claim 1, it is characterized in that:
In step 1) in, when the first step cannot judge defects of finned tube module position, judge in conjunction with second step, as described below:
The speed utilizing each system pressure or temperature to decline is different, opens manhole and observes, judge pipe belonging to leak source and general height; Observe for several times, positive opening flue gas plate washer, keeps the draft to burner hearth, opens corresponding manhole door, inwards visual, listen attentively to; Coordinated operation personnel, centering presses through vapours system, manual intervention operated valve when taking to run, pours in down a chimney steam to coordinate leakage detection by auxiliary vapour or high-pressure superheater.
3., according to the method for a kind of quick reparation defects of finned tube module of waste heat boiler described in claim 2, it is characterized in that:
In step 1) in, if vapour system is because of various unexpected and to cause pressure release too fast, when leak source position cannot be found by the above-mentioned first step and second step, then adopt air testing method, water pressure test method or steam test method to search.
4. the method for a kind of quick reparation defects of finned tube module of waste heat boiler according to claim 1 or 2 or 3, it is characterized in that: in step 4) in, described argon-filling device has a bend pipe, and bend pipe adopts flat tube, enables bend pipe fill in little weld seam; The two ends up and down that extended surface tube inwall is positioned at weld bond are respectively equipped with the blocking cup made with the water soluble paper.
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| CN106239029B (en) * | 2016-08-23 | 2018-06-01 | 郑州荣奇热电能源有限公司 | A kind of high temperature superheater imports and exports header restorative procedure |
| CN106180987A (en) * | 2016-08-23 | 2016-12-07 | 郑州荣奇热电能源有限公司 | A kind of high temperature superheater imports and exports header restorative procedure |
| CN106180988A (en) * | 2016-08-23 | 2016-12-07 | 郑州荣奇热电能源有限公司 | A kind of high temperature superheater imports and exports header restorative procedure |
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| WO1999010696A1 (en) * | 1997-08-27 | 1999-03-04 | Electric Power Research Institute, Inc. | Method for repairing heat exchanger tubing through partial tube replacement |
| RU2235011C1 (en) * | 2003-09-26 | 2004-08-27 | Андрианов Николай Филиппович | Method for making or repairing heat exchange sections of air cooled apparatuses |
| CN100458261C (en) * | 2007-06-29 | 2009-02-04 | 大庆石油管理局 | Small diameter metal pipe long-range lining glass reinforced plastic hose repairing method |
| CN101762633A (en) * | 2008-12-25 | 2010-06-30 | 中国石油天然气股份有限公司 | Method for rapidly detecting pipeline body defects |
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| CN102554550A (en) | 2012-07-11 |
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