CN115415732A - Method for treating material degradation of induced draft blade of deep peak regulation coal-electric unit - Google Patents
Method for treating material degradation of induced draft blade of deep peak regulation coal-electric unit Download PDFInfo
- Publication number
- CN115415732A CN115415732A CN202210875178.5A CN202210875178A CN115415732A CN 115415732 A CN115415732 A CN 115415732A CN 202210875178 A CN202210875178 A CN 202210875178A CN 115415732 A CN115415732 A CN 115415732A
- Authority
- CN
- China
- Prior art keywords
- welding
- blade
- coal
- induced draft
- deep peak
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000005297 material degradation process Methods 0.000 title claims description 16
- 238000003466 welding Methods 0.000 claims abstract description 74
- 230000008439 repair process Effects 0.000 claims abstract description 33
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000006247 magnetic powder Substances 0.000 claims abstract description 17
- 238000005260 corrosion Methods 0.000 claims abstract description 16
- 230000007797 corrosion Effects 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 12
- 238000005516 engineering process Methods 0.000 claims abstract description 11
- 230000007547 defect Effects 0.000 claims abstract description 10
- 238000007689 inspection Methods 0.000 claims abstract description 9
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 9
- 230000006378 damage Effects 0.000 claims abstract description 8
- 206010016256 fatigue Diseases 0.000 claims abstract description 8
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000000919 ceramic Substances 0.000 claims abstract description 6
- 238000005524 ceramic coating Methods 0.000 claims abstract description 4
- 238000003745 diagnosis Methods 0.000 claims abstract description 4
- 238000013399 early diagnosis Methods 0.000 claims abstract description 4
- 238000001514 detection method Methods 0.000 claims description 28
- 239000010410 layer Substances 0.000 claims description 15
- 239000011324 bead Substances 0.000 claims description 12
- 238000004140 cleaning Methods 0.000 claims description 10
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- 238000005507 spraying Methods 0.000 claims description 10
- 230000005415 magnetization Effects 0.000 claims description 9
- 238000005498 polishing Methods 0.000 claims description 9
- 238000012360 testing method Methods 0.000 claims description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 239000006249 magnetic particle Substances 0.000 claims description 6
- 230000035945 sensitivity Effects 0.000 claims description 6
- 239000000725 suspension Substances 0.000 claims description 6
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 claims description 3
- 239000007900 aqueous suspension Substances 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 239000010953 base metal Substances 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 238000011437 continuous method Methods 0.000 claims description 3
- 230000002950 deficient Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 229910001026 inconel Inorganic materials 0.000 claims description 3
- 239000011229 interlayer Substances 0.000 claims description 3
- 239000002932 luster Substances 0.000 claims description 3
- 230000035515 penetration Effects 0.000 claims description 3
- 239000003245 coal Substances 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims description 2
- 230000035882 stress Effects 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 5
- 230000006866 deterioration Effects 0.000 abstract description 4
- 230000001680 brushing effect Effects 0.000 abstract 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 8
- 239000003546 flue gas Substances 0.000 description 8
- 239000000428 dust Substances 0.000 description 5
- 238000009659 non-destructive testing Methods 0.000 description 4
- 238000005488 sandblasting Methods 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000012459 cleaning agent Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005536 corrosion prevention Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000011086 high cleaning Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- 238000007751 thermal spraying Methods 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
- B23P6/002—Repairing turbine components, e.g. moving or stationary blades, rotors
- B23P6/007—Repairing turbine components, e.g. moving or stationary blades, rotors using only additive methods, e.g. build-up welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
- B08B7/0035—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by radiant energy, e.g. UV, laser, light beam or the like
- B08B7/0042—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by radiant energy, e.g. UV, laser, light beam or the like by laser
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
- G01N27/84—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields by applying magnetic powder or magnetic ink
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
- G01N27/85—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields using magnetographic methods
-
- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Electrochemistry (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Pathology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
A method for treating the deterioration of the material of the induced draft blade of a deep peak shaving coal-electric machine set comprises the following steps: carrying out laser rust removal to quickly remove scale and attached crops on the surface of the blade; a magnetic memory detector is adopted to detect the problem of material deterioration caused by stress concentration of the blade and the like, and early diagnosis of fatigue damage of equipment is given; rechecking the defects of a stress concentration area and a surface corrosion pit in the fatigue diagnosis result by adopting magnetic powder inspection to determine whether cracks exist; repairing the discovered cracks and corrosion pits on the surface of the blade by adopting a low-stress nickel-based cold repair welding technology; and cold brushing the nano ceramic coating to form a compact ceramic layer. The treatment method provided by the invention has the advantages that the problem of material deterioration of the induced draft fan blade of the deep peak shaving coal-electric machine set is solved rapidly, environmentally and thoroughly, and the treatment method is proved to have good effect through practice and is suitable for popularization and application.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of electric power generator sets, in particular to a degradation treatment technology for blades of a generator set.
[ background of the invention ]
The induced draft fan is one of the important auxiliary machinery of the power station boiler, and the work flow is that the boiler combustion produces the flue gas, at first passes through the denitrification facility (desorption nitrogen oxide in the flue gas), then gets into the dust remover (removes the dust in the flue gas), and the induced draft fan sends the flue gas into the set flue gas pipeline, gets into flue gas desulphurization unit (removal sulphide in the flue gas), discharges in the atmosphere at last.
Under the double-carbon target, the flexible operation of the coal-electric unit under deep peak shaving becomes a normal state, during the extremely-low load operation of the unit, the operation state of the unit is greatly changed compared with the rated working condition, the operation parameters of the draught fan are easy to change suddenly aiming at the draught fan, the air quantity is inconsistent and alternative, the draught fan is easy to lose speed and generate a surge phenomenon, and finally fatigue cracks or even breakage is generated at the blade root. In addition, the research finds that the efficiency of the boiler can be improved by about 0.5 to 0.7 percent when the exhaust gas temperature is reduced by 10 ℃. The exhaust gas temperature can be reduced to 90 ℃, and the low-temperature corrosion problem of tail flue areas such as a draught fan and the like is brought while the exhaust gas waste heat of the boiler is greatly utilized. The flue gas often contains ash particles which continuously wash the blades under the action of high-speed airflow, and the metal surfaces of the blades are easily abraded and scaled.
To sum up, the main problems of the induced draft fan blade of the deep peak shaving coal motor unit are dust and scale formation, low-temperature sulfur corrosion and fatigue cracks at the blade root.
[ summary of the invention ]
The invention provides the existing problems and a solution aiming at the problems, namely aiming at the aging of the blade of the induced draft fan, and mainly aiming at improving and comprehensively treating the conditions of dust deposition, scaling, low-temperature sulfur and fatigue cracks at the blade root. The problems of dust and scale formation, low-temperature sulfur corrosion and fatigue cracks at the leaf root are solved and eliminated, the service life of the fan blade is obviously prolonged, and non-stop accidents of the boiler caused by the cracking of the leaf segment due to the deterioration of the material are prevented.
The invention relates to a comprehensive treatment method for material degradation of a draught fan blade of a deep peak shaving coal-electric machine set, which is characterized by comprising the following steps of:
the method comprises the following steps: carrying out laser rust removal, and rapidly removing scale and attached crops on the surface of the blade to expose metal luster;
step two: a magnetic memory detector is adopted to detect stress concentration and surface and subsurface defects caused by material discontinuity at a blade root and a variable cross section of the blade, and early diagnosis of fatigue damage of equipment is given;
step three: rechecking a stress concentration area and defects in the fatigue diagnosis result by adopting magnetic particle inspection to determine whether cracks exist or not;
step four: repairing the discovered cracks and corrosion pits on the surface of the blade by adopting a low-stress nickel-based cold repair welding technology;
step five: the nano ceramic coating is used for cold brush coating, and is solidified by laser irradiation heating to form a compact ceramic layer with corrosion resistance, adhesion resistance and wear resistance.
In the step of laser derusting, cleaning parameters are determined according to orthogonal test and range analysis method
And cleaning parameters include, without limitation: laser power, scan speed, laser pulse width, and laser frequency.
During detection in the second step, a single sensor is adopted to be perpendicular to a detection surface and scan along the vertical direction of the variable cross section;
the main parameters of magnetic particle testing in step three include, but are not limited to: magnetic powder type, magnetization method, magnetic suspension concentration, magnetization current, detection sensitivity and acceptance level;
and the main parameters of the magnetic powder detection are selected as follows: type of magnetic powder: non-fluorescent black magnetic powder; the magnetization method comprises the following steps: wet yoke continuous method; concentration of magnetic suspension: an aqueous suspension; magnetizing current: alternating current; detection sensitivity: a1-30/100; and (4) acceptance level: and (4) I stage. Nondestructive testing of fourth part magnetic powder by referring to NB/T47013-2015 pressure-bearing equipment
In the fourth step, manual argon arc welding is adopted when low-stress nickel-based cold repair welding is adopted; inconel 82 welding wire, 2.4mm in diameter; preheating temperature is 150-200 ℃, and interlayer temperature is controlled below 100 ℃; welding current is 70-90A, direct current is connected in a positive mode, voltage is 20-25V, and welding speed is 40-70 mm/min.
Furthermore, the welding rod does not swing in repair welding, the thickness of each welding bead does not exceed 4mm, a sectional back welding method is adopted for the long welding bead, and an arc pit is filled during arc closing; hammering immediately after welding, wherein the middle part of the welding bead is hammered first during hammering, then the two sides of the welding bead are hammered, and the hammer marks are compact and neat, so that repetition is avoided; ensuring enough grinding allowance after repair welding, and performing surface macroscopic inspection on a repair welding area and a nearby base metal after welding one layer to confirm that no obvious defect exists; and (5) polishing the repair welding area 24 hours after the repair welding operation is finished, performing penetration flaw detection on the repair welding area, and polishing the repair welding area after the flaw detection is qualified.
If the blade profile is defective, the back of the blade is supported by a lining plate during welding, the welding area is controlled according to the blade profile layer by layer.
In the fifth step: the coating material adopts composite nano boron nitride; spraying viscosity: measured with a-4 viscometer, at 20s to 30s, where 20s to 30s represents a quantity of measured viscosity, meaning the time required for total run-off; the spraying pressure is 0.3-0.4 MPa; the distance between the nozzles is 300-400mm; during spraying, the lower track is ensured to press 1/4 or 1/3 of the upper track, so that the phenomenon of spray leakage is avoided; the laser irradiation power was 800W.
The technical scheme adopted by the invention has the beneficial effects that: the technical parameter selection of laser rust removal is crucial, and through a large number of tests, the cleaning parameters of the attachments and the scale deposits of the steel type (Q345) commonly used for the fan blade are determined, so that the cleaning agent has the advantages of no damage to the base layer of the blade, high smoothness, high cleaning efficiency, no pollution to the working environment and low cost in single-person operation compared with the common sand blasting cleaning.
After laser derusting, the surface smoothness can meet the magnetic memory flaw detection requirement. The blade cracks mainly occur at the root of the blade root and the stress concentration part of the variable cross section, and a magnetic memory flaw detector is adopted to quickly scan to determine the key position, so that the flaw detection efficiency is improved. And (3) aiming at the key position, magnetic powder inspection is adopted, whether cracks exist is finally confirmed, and if the cracks exist, low-stress nickel-based cold repair welding technology is adopted for welding repair treatment. The method greatly improves the nondestructive testing speed of the blade. The detection of one fan can be completed within 4 hours in the two steps. If flaw detection is carried out after sand blasting and mechanical polishing, the construction period is at least more than 2 days.
The nano ceramic technology is adopted for anti-abrasion and anti-corrosion treatment, and the thickness of the coating is below 0.2mm and is uniformly distributed. Compared with the common thermal spraying corrosion prevention technology, the coating is thin, does not damage a base material, has good corrosion resistance, slag bonding resistance and wear resistance effects, and has the quality guarantee period of more than 3 years.
To sum up, the method provided by the patent has the advantages that the problem of material degradation of the induced draft fan blade of the deep peak regulation coal-electric machine set is solved quickly, environmentally and thoroughly, the method runs for 2 years in a Longshan power plant, and the effect is good.
[ detailed description ] embodiments
The present invention will be described in detail with reference to the embodiments, in the description of the present invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on positional relationships, merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
The invention relates to a comprehensive treatment method for material degradation of a draught fan blade of a deep peak shaving coal-electric machine set, which is characterized by comprising the following steps of:
the method comprises the following steps: carrying out laser rust removal, and rapidly removing scale and attached crops on the surface of the blade to expose the metal luster;
step two: a magnetic memory detector is adopted to detect stress concentration and surface and subsurface defects caused by material discontinuity at a blade root and a variable cross section of the blade, and early diagnosis of fatigue damage of equipment is given;
step three: rechecking a stress concentration area and a defect in a fatigue diagnosis result by adopting magnetic particle inspection to determine whether a crack exists;
step four: repairing the cracks and the corrosion pits on the surface of the blade by adopting a low-stress nickel-based cold repair welding technology;
step five: the nano ceramic coating is used for cold brush coating, and is solidified by laser irradiation heating to form a compact ceramic layer with corrosion resistance, adhesion resistance and wear resistance.
In step one laser derusting, cleaning parameters are determined according to the method of orthogonal test and range analysis, and the cleaning parameters include but are not limited to: laser power, scan speed, laser pulse width, and laser frequency.
During detection in the second step, a single sensor is adopted to be perpendicular to a detection surface and scan along the vertical direction of the variable cross section;
the main parameters of magnetic particle testing in step three include, but are not limited to: magnetic powder type, magnetization method, magnetic suspension concentration, magnetization current, detection sensitivity and acceptance level;
and the main parameters of the magnetic powder detection are selected as follows: type of magnetic powder: non-fluorescent black magnetic powder; the magnetization method comprises the following steps: a wet yoke continuous method; concentration of magnetic suspension: an aqueous suspension; magnetizing current: alternating current; detection sensitivity: a1-30/100; and (4) acceptance level: and (4) I stage. And 4, carrying out nondestructive testing on the fourth part of magnetic powder detection by referring to NB/T47013-2015 pressure-bearing equipment.
In the fourth step, manual argon arc welding is adopted when low-stress nickel-based cold repair welding is adopted; inconel 82 welding wire, 2.4mm in diameter; preheating temperature is 150-200 ℃, and interlayer temperature is controlled below 100 ℃; welding current is 70-90A, direct current is connected positively, voltage is 20-25V, and welding speed is 40-70 mm/min.
Furthermore, the welding rod does not swing in repair welding, the thickness of each welding bead does not exceed 4mm, a sectional backing welding method is adopted for long welding beads, and an arc pit is filled during arc closing; hammering immediately after welding, wherein the middle part of the welding bead is hammered first during hammering, then the two sides of the welding bead are hammered, and the hammer marks are compact and neat, so that repetition is avoided; ensuring enough grinding allowance after repair welding, and performing surface macroscopic inspection on a repair welding area and a nearby base metal after welding one layer to confirm that no obvious defect exists; and (5) polishing the repair welding area 24h after the repair welding operation is finished, performing penetration flaw detection on the repair welding area, and polishing the repair welding area after the flaw detection is qualified.
If the blade profile is defective, the back of the blade is supported by a lining plate during welding, the welding area is controlled according to the blade profile layer by layer.
In the fifth step: the coating material adopts composite nano boron nitride; spraying viscosity: measured with a-4 viscometer, at 20s to 30s; the spraying pressure is 0.3-0.4 MPa; the distance between the nozzles is 300-400mm; during spraying, the lower track is ensured to press 1/4 or 1/3 of the upper track, so that the phenomenon of spraying leakage is avoided; the laser irradiation power was 800W.
The technical scheme adopted by the invention has the beneficial effects that: the technical parameter selection of laser rust removal is crucial, and through a large number of tests, the cleaning parameters of the attachments and the scale deposits of the steel type (Q345) commonly used for the fan blade are determined, so that the cleaning agent has the advantages of no damage to the base layer of the blade, high smoothness, high cleaning efficiency, no pollution to the working environment and low cost in single-person operation compared with the common sand blasting cleaning.
After laser derusting, the surface smoothness can meet the magnetic memory flaw detection requirement. The blade cracks mainly occur at the root of the blade root and the stress concentration part of the variable cross section, and a magnetic memory flaw detector is adopted to quickly scan to determine the key position, so that the flaw detection efficiency is improved. And (3) aiming at the key position, magnetic powder inspection is adopted, whether cracks exist is finally confirmed, and if the cracks exist, low-stress nickel-based cold repair welding technology is adopted for welding repair treatment. The method greatly improves the nondestructive testing speed of the blade. The detection of one fan can be completed within 4 hours in the two steps. If the flaw detection is carried out after sand blasting and mechanical polishing, the construction period is at least more than 2 days.
The nano ceramic technology is adopted for anti-abrasion and anti-corrosion treatment, and the thickness of the coating is below 0.2mm and is uniformly distributed. Compared with the common thermal spraying corrosion prevention technology, the coating is thin, does not damage a base material, has good corrosion resistance, slag resistance and wear resistance effects, and has a shelf life of more than 3 years.
To sum up, the method provided by the patent has the advantages that the problem of material degradation of the induced draft fan blade of the deep peak regulation coal-electric machine set is solved quickly, environmentally and thoroughly, the method runs for 2 years in a Longshan power plant, and the effect is good.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A comprehensive treatment method for material degradation of a draught fan blade of a deep peak shaving coal-electric machine set is characterized by comprising the following steps:
the method comprises the following steps: carrying out laser rust removal, and rapidly removing scale and attached crops on the surface of the blade to expose metallic luster;
step two: a magnetic memory detector is adopted to detect stress concentration and surface and subsurface defects caused by material discontinuity at a blade root and a variable cross section of the blade, and early diagnosis of fatigue damage of equipment is given;
step three: rechecking the defects of a stress concentration area and a surface corrosion pit in the fatigue diagnosis result by adopting magnetic powder inspection to determine whether cracks exist;
step four: repairing the discovered cracks and corrosion pits on the surface of the blade by adopting a low-stress nickel-based cold repair welding technology;
step five: the nano ceramic coating is used for cold brush coating, and is solidified by laser irradiation heating to form a compact ceramic layer with corrosion resistance, adhesion resistance and wear resistance.
2. The comprehensive treatment method for the material degradation of the induced draft fan blade of the deep peak shaving coal-electric machine set according to claim 1, wherein the laser rust removal is adopted in the step, and the cleaning parameters are determined according to an orthogonal test and range analysis method.
3. The comprehensive treatment method for the material degradation of the induced draft fan blade of the deep peak shaving coal-electric machine set according to claim 2, wherein the cleaning parameters include but are not limited to: laser power, scan speed, laser pulse width, and laser frequency.
4. The comprehensive treatment method for the material degradation of the induced draft fan blade of the deep peak shaving coal-electric machine set according to claim 1, wherein in the second step, a single sensor is adopted to be perpendicular to the detection surface and scan along the vertical direction of the variable cross section.
5. The comprehensive treatment method for the material degradation of the induced draft fan blade of the deep peak shaving coal-electric machine set according to claim 1, wherein the main parameters of the magnetic particle testing in the third step include but are not limited to: magnetic powder type, magnetization method, magnetic suspension concentration, magnetization current, detection sensitivity and acceptance level.
6. The comprehensive treatment method for the material degradation of the induced draft fan blade of the deep peak shaving coal-electric machine set according to claim 5, characterized in that the main parameters of the magnetic particle testing are selected from the following steps: type of magnetic powder: non-fluorescent black magnetic powder; the magnetization method comprises the following steps: a wet yoke continuous method; concentration of magnetic suspension: an aqueous suspension; magnetizing current: alternating current; detection sensitivity: a1-30/100; and (4) acceptance level: and (4) I stage.
7. The comprehensive treatment method for the material degradation of the induced draft fan blade of the deep peak shaving coal-electric machine set according to claim 1, wherein in the fourth step, manual argon arc welding is adopted when low-stress nickel-based cold repair welding is adopted; inconel 82 welding wire, 2.4mm in diameter; preheating temperature is 150-200 ℃, and interlayer temperature is controlled below 100 ℃; welding current is 70-90A, direct current is connected positively, voltage is 20-25V, and welding speed is 40-70 mm/min.
8. The comprehensive treatment method for the material degradation of the induced draft fan blade of the deep peak shaving coal-electric machine set according to claim 7, wherein in the repair welding process, a welding rod does not swing, the thickness of each welding bead does not exceed 4mm, a sectional back welding method is adopted for long welding beads, and an arc pit is filled during arc closing; hammering immediately after welding, wherein the middle part of the welding bead is hammered first during hammering, then the two sides of the welding bead are hammered, and the hammer marks are compact and neat, so that repetition is avoided; after repair welding, enough polishing allowance is ensured, and after one layer of repair welding is finished, surface macroscopic inspection is carried out on a repair welding area and nearby base metal, and no obvious defect is confirmed; and (5) polishing the repair welding area 24h after the repair welding operation is finished, performing penetration flaw detection on the repair welding area, and polishing the repair welding area after the flaw detection is qualified.
9. The comprehensive treatment method for material degradation of the induced draft fan blade of the deep peak shaving coal motor unit according to claim 8, wherein if the profile of the blade is defective, the back surface is backed by a lining plate during welding, the layer is built up layer by layer, and the size of a welding area is controlled according to the profile of the blade.
10. The comprehensive treatment method for the material degradation of the induced draft fan blade of the deep peak shaving coal-electric machine set according to claim 1, characterized by comprising the following steps: the coating material adopts composite nano boron nitride; spraying viscosity: measuring by a-4 viscometer for 20-30 s; the spraying pressure is 0.3-0.4 MPa; the distance between the nozzles is 300-400mm; during spraying, the lower track is ensured to press 1/4 or 1/3 of the upper track, so that the phenomenon of spray leakage is avoided; the laser irradiation power was 800W.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210875178.5A CN115415732A (en) | 2022-07-22 | 2022-07-22 | Method for treating material degradation of induced draft blade of deep peak regulation coal-electric unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210875178.5A CN115415732A (en) | 2022-07-22 | 2022-07-22 | Method for treating material degradation of induced draft blade of deep peak regulation coal-electric unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115415732A true CN115415732A (en) | 2022-12-02 |
Family
ID=84196370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210875178.5A Pending CN115415732A (en) | 2022-07-22 | 2022-07-22 | Method for treating material degradation of induced draft blade of deep peak regulation coal-electric unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115415732A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116481679A (en) * | 2023-02-28 | 2023-07-25 | 国能锅炉压力容器检验有限公司 | Stress monitoring device and stress monitoring method for fire side of water-cooled wall of power station boiler |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001303903A (en) * | 2000-04-24 | 2001-10-31 | Toshiba Corp | Repairing method for gas turbine blade |
| CN101053926A (en) * | 2007-05-31 | 2007-10-17 | 四川东风电机厂有限公司 | Axial-flow rotary propeller type water turbine runner blade crackle treating method |
| CN101412176A (en) * | 2008-11-20 | 2009-04-22 | 江苏大学 | Laser impact refabrication method for metallic structural parts containing fine crack |
| CN101566077A (en) * | 2009-06-04 | 2009-10-28 | 湖南省湘电锅炉压力容器检验中心有限公司 | Last stage vane of steam turbine and preparation method thereof |
| CN101748403A (en) * | 2009-12-28 | 2010-06-23 | 天津大族烨峤激光技术有限公司 | Composite strengthening method of anti-wear plate |
| CN101767261A (en) * | 2010-01-13 | 2010-07-07 | 西安热工研究院有限公司 | Process for repairing water erosion damage of flow passage component of steam turbine and protecting flow passage component of steam turbine |
| CN103111724A (en) * | 2012-12-07 | 2013-05-22 | 无锡透平叶片有限公司 | Turbine blade laser cladding area flaw welding method |
| CN104668741A (en) * | 2013-11-29 | 2015-06-03 | 陕西天元材料保护科技有限公司 | Welding repair method of blast furnace gas turbine blade |
| US20190039191A1 (en) * | 2017-08-07 | 2019-02-07 | United Technologies Corporation | Laser deposition weld repair |
| CN109848638A (en) * | 2019-01-25 | 2019-06-07 | 哈尔滨工业大学 | A kind of high temperature alloy combined-repair method and repair materials |
-
2022
- 2022-07-22 CN CN202210875178.5A patent/CN115415732A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001303903A (en) * | 2000-04-24 | 2001-10-31 | Toshiba Corp | Repairing method for gas turbine blade |
| CN101053926A (en) * | 2007-05-31 | 2007-10-17 | 四川东风电机厂有限公司 | Axial-flow rotary propeller type water turbine runner blade crackle treating method |
| CN101412176A (en) * | 2008-11-20 | 2009-04-22 | 江苏大学 | Laser impact refabrication method for metallic structural parts containing fine crack |
| CN101566077A (en) * | 2009-06-04 | 2009-10-28 | 湖南省湘电锅炉压力容器检验中心有限公司 | Last stage vane of steam turbine and preparation method thereof |
| CN101748403A (en) * | 2009-12-28 | 2010-06-23 | 天津大族烨峤激光技术有限公司 | Composite strengthening method of anti-wear plate |
| CN101767261A (en) * | 2010-01-13 | 2010-07-07 | 西安热工研究院有限公司 | Process for repairing water erosion damage of flow passage component of steam turbine and protecting flow passage component of steam turbine |
| CN103111724A (en) * | 2012-12-07 | 2013-05-22 | 无锡透平叶片有限公司 | Turbine blade laser cladding area flaw welding method |
| CN104668741A (en) * | 2013-11-29 | 2015-06-03 | 陕西天元材料保护科技有限公司 | Welding repair method of blast furnace gas turbine blade |
| US20190039191A1 (en) * | 2017-08-07 | 2019-02-07 | United Technologies Corporation | Laser deposition weld repair |
| CN109848638A (en) * | 2019-01-25 | 2019-06-07 | 哈尔滨工业大学 | A kind of high temperature alloy combined-repair method and repair materials |
Non-Patent Citations (1)
| Title |
|---|
| 焦钢毅;: "轴流式水轮机过流部件修复方法的探讨研究", 电站系统工程, no. 03, pages 223 - 66 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116481679A (en) * | 2023-02-28 | 2023-07-25 | 国能锅炉压力容器检验有限公司 | Stress monitoring device and stress monitoring method for fire side of water-cooled wall of power station boiler |
| CN116481679B (en) * | 2023-02-28 | 2023-09-12 | 国能锅炉压力容器检验有限公司 | Stress monitoring device and stress monitoring method for fire side of water-cooled wall of power station boiler |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103409758B (en) | Pump shells and blade microcrack laser reinforcing life-prolonging method | |
| CN104532233B (en) | Rotor axle position laser melting coating restorative procedure | |
| CN109590668A (en) | A kind of steam turbine cylinder sealing surface renovation technique | |
| WO2019037410A1 (en) | Method for repairing abraded bearing | |
| US20080028605A1 (en) | Weld repair of metallic components | |
| CN102218638B (en) | Process method for repairing gas turbine vanes by micro-arc deposition coating | |
| CN107813051A (en) | Laser melting coating and manual electric arc welding combination restorative procedure after the abrasion of TRT wheel hubs | |
| CN105057969A (en) | Blisk repairing method based on micro-ray plasma arc welding and electric spark finishing | |
| CN115415732A (en) | Method for treating material degradation of induced draft blade of deep peak regulation coal-electric unit | |
| CN113172361B (en) | Method and system for welding and repairing hub of wind generating set | |
| CN109986279A (en) | A kind of pyrolysis furnace high pressure steam boiler water-supply valve welding repair method | |
| CN102009279A (en) | Method for lowering crack sensitivity of aeroengine cast stainless steel component during repair welding | |
| CN108326509A (en) | A kind of quick reproducing method of conticaster roller | |
| CN109108269A (en) | Locomotive wheel reparation iron(-)base powder and laser 3D printing renovation technique | |
| CN101920429A (en) | Combustion engine crankshaft electric spark overlaying repairing process | |
| CN107175460A (en) | Tuyere cover of blast furnace renovation technique | |
| CN112877569A (en) | Nickel-based alloy powder for laser cladding and laser cladding method | |
| CN106521491A (en) | Technique for manufacturing turnout bedplate of high-speed railway by laser | |
| CN105506505A (en) | Laser cladding Fe-base alloy powder for repairing damaged axial flow fan blade and repairing method | |
| CN113983275A (en) | Reinforcing and repairing method for corrosion defects on outer surface of oil and gas pipeline | |
| CN112475549A (en) | Argon arc welding multilayer multi-channel water wall pipe repairing method | |
| CN104233283B (en) | A kind of Co-based alloy powder for internal-combustion engine booster moving vane laser repairing | |
| RU2082573C1 (en) | Method of reconditioning of worn switch points by electric arc surfacing | |
| CN110846653A (en) | Method for strengthening wear-resistant layer on surface of steel conveying roller | |
| CN104233002A (en) | Nickel base alloy powder for laser repair of supercharger air outlet housing of internal combustion engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |