CN101822936A - High-temperature scale anticorrosion construction method for heat-engine plant desulfurizer - Google Patents
High-temperature scale anticorrosion construction method for heat-engine plant desulfurizer Download PDFInfo
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Abstract
The invention discloses a high-temperature scale anticorrosion construction method for a heat-engine plant desulfurizer, comprising following steps of basic treatment, undercoat painting, a primary scale daub coating, a secondary scale daub coating, polishing smoothly, local part enhancement, wear-resisting mortar coating, top coat painting and final inspection. The anticorrosion construction method has the advantages of strong anticorrosion capability, stable adherence, no easy fall, strong adhesion of a glass scale liner, small contraction after solidification, long service life of the liner, better shock resistance and anticorrosion performance than other materials, easy repair of local damage, room-temperature (or low-temperature heating) solidification and convenient construction.
Description
Technical field
The present invention relates to a kind of anticorrosion construction method of heat-engine plant desulfurizer, particularly relate to the anticorrosion construction method of anticorrosive paint spraying in a kind of heat-engine plant desulfurizer high-temperature scale resin interlining.
Background technology
Traditional flue-gas desulfurizing engineering can form moist subenvironment in the part, and this subenvironment can cause the corrosion of certain chemistry and physics to the inwall of metal.Though some present anti-corrosion measures can be controlled the generation of corrosion to a certain extent, owing to reasons such as anticorrosion material, anticorrosion construction methods, cause the not very good and environmental protection of carrying out after the desulfurization of preservative treatment.
Summary of the invention
It is strong that technical problem to be solved by this invention provides a kind of resistance to corrosion, adhere to stable, be not easy to come off, the strong adhesion of glass flake lining, the curing after-contraction is little, the long service life of lining, shock resistance and erosion resistance are better than other materials, and room temperature or low-temperature heat curing are repaired in local damage easily, easy to operate during construction, can reduce cost, save the high-temperature scale anticorrosion construction method for heat-engine plant desulfurizer of duration.
In order to solve the problems of the technologies described above, high-temperature scale anticorrosion construction method for heat-engine plant desulfurizer provided by the invention, may further comprise the steps: basic handling, priming paint brushing, first pass scale clay smear, second time scale clay smeared, polish flat, locally strengthen, anti-wear mortar is smeared, finish paint brushing, inspection eventually, it is characterized in that:
(1), basic handling
A, equipment scale resin antiseptic project matrix are made requirement
1) physical dimension of equipment and intensity adhere to specification;
2) then be the one-time-concreting moulding if any concrete surface, do not allow to use plain sand finish;
3) matrix must be closely knit, smooth, dusting must not be arranged, flakes, crack, voids and pits and greasy dirt;
4) the concrete surface cavity of the exposing reinforcing bar cast of must being in the milk again reaches closely knit smooth, and pre-buried steel member face of weld is level and smooth, no undercut, overlap, dreg defect;
5) the extremely mild transition of hour polishing of template fissure of displacement size, bigger as fissure of displacement size, then polish to arc transition;
6) gradient in liquid overcurrent zone must adhere to specification;
7) basic unit must be dry, and the moisture content in degree of depth 20mm is not more than 6%;
8) more than inner corner trim arc transition R＞10mm, more than external corner arc transition R＞5mm;
9) all weld seams of anticorrosion district are continuous full weld, and seam then must be replenished inside weld as having only outside weld;
10) good, the zero defect of all appearances of weld, all weld seams must polish flat with abrasive machine, and matrix surface to be served as a contrast can not exist overlap and welding slag;
B, construction safeguard
1) the job site environment temperature is not less than 5 ℃, and is higher than 3 ℃ of dew-point temperatures; Relative air humidity is not more than 85%;
2) reasonably workmen and facility configuration, effectively construction management measure is the important leverage that improves efficiency of construction, the combination of taking to optimize is disposed, and carries out the diversification dynamic management;
3) under the normal condition, divide the construction of relieving of two construction teams, each construction team divides many group multiplex (MUX)s to make surface construction, adopts the operation of working in three shifts when the duration is nervous;
4) if environmental aspect does not reach that above construction environment requires and duration when nervous, will set up the constant temperature dehumidification device, to guarantee the requirement of environment to construction;
C, derusting by sandblasting
Can produce a large amount of dusts during 1) owing to sandblast, therefore must be provided with ventilation equipment, guarantee workmen's safety, at once that the cleaning of the dust on the matrix is clean after the sandblast, clear up with brush, pressure-air and dust catcher utensil;
2) derusting by sandblasting comprises quality examination and brushes the first road priming paint and finish in 8h;
3) if engineering is because working face is bigger, finish in can't be when 8h, the way that adopts segmentation and effectively isolate is promptly earlier carried out derusting by sandblasting to certain area, brushes one priming paint through after the assay was approved, after treating solidifying priming paint, to the remainder derusting by sandblasting, protected the part of priming this moment, and continue the distance that the sandblast end is reserved 50mm at least at it again, enable to intersect sandblast, thereby guarantee the quality of sandblast;
4) the desired credit rating of sandblast must reach the Sa2.5 level, promptly the surface is near the silvery white requirement of metal, remove all foreign material such as grease, oxide skin, corrosion product of metal surface fully, and remove dust with the compressed air of dust catcher, dried and clean or brush, remaining rust staining, oxide skin cause that the area of light discolouration must not surpass 5% on the area of any 100 * 100mm2, and roughness should reach 40-70 μ m;
5) the compressed air drying cleaning of sandblast employing must not contain greasy dirt, foreign material and moisture, and pressure is 0.6-0.8Mpa;
6) particle diameter of sand grains is 2-3mm;
7) sandblast construction technology index: nozzle diameter: 6-8mm; Jet angle: 30-75 degree; Spray distance: 80-200mm;
(2), priming paint brushing
Get 120g/m
2Epoxy zinc rich primer mixes according to volume ratio with diluent at 1: 0.5, after stirring according to volume ratio 100: 10～12 ratios adding complete curing agent, brushes twice, consumption 170-200g/m with hairbrush or roller
2
(3), the scale clay smears
A, get the scale clay and mix at 1: 0.5 according to volume ratio with diluent, adding complete curing agent according to volume ratio 100: 10～12 ratios stirs, use after stirring evenly and leave standstill the about 15min of slaking after the batching, each scale clay that stirs is controlled in the 30min and uses up, and the presetting period should be controlled at 38～42min;
B, coating on the basis of priming paint with the unidirectional material of will constructing equably of scraper plate or spatula, is 1.0 ± 0.2mm after the initial set of per pass construction thickness, and the time interval that per pass is smeared is 12h;
After C, per pass scale clay are smeared, before initial set, must in time use the wool felt roll roll extrusion that speckles with styrene solvent till the perusal smooth surface evenly, the surface does not allow the trickling vestige, and roll extrusion is smooth again once producing; Two-layer clay smear finish and completion of cure after, test with the electric spark detector;
In work progress, construction surface keeps clean, and polishes flat if any thrust or construction tear drop;
Butt joint should be avoided in the interface, end that D, secondary are smeared, and must take the overlapping the slot mode to overlap;
(4), the repairing of scale clay layer
A, when pin hole, foreign material are found in check, the application wheel machine is removed its polishing, should polish to basal surface to pin hole or the defective that connects lining, and become the domatic transition, the angle of domatic and matrix is less than 15 degree; After solvent washing and drying, smear priming paint and scale clay again; Find to have holiday or the not enough defective of local lining thickness through check, this region surface is clean with solvent clean, smear the construction material after the drying once more and reach specific thickness;
After B, scaffold were removed, its intersection point place did corresponding the repairing;
(5), local glass fiber cloth or felt strengthen
The flange seal end that A, flue are served as a contrast the flange of all corner regions of zone, deflector, non-metal expansion joint and transition region and miscellaneous equipment, adapter is all solidified the back at the scale lining and is adopted glass fabric or felt to strengthen, and the enhancement region width is that both sides respectively are not less than 100mm; The handing-over material of small pieces of cloth used for patches glass fabric or felt must adopt the resin preparation identical with scale lining clay;
B, the scale liner surface is polished flat, undertaken by the order of gluing-patch-gluing with the clean back of solvent washing, the lap of splice of glass fabric or felt is greater than 50mm; It is smooth that the lining flange sealing surface should keep, and glass fabric or felt after strengthening 12h are removed the burr of enhancement region;
(6), finish paint brushing
A, finish that priming paint brushing, scale clay are smeared, after the operation that the repairing of scale clay layer, glass fabric or felt strengthen, the brushing finish paint;
B, get epoxy resin varnish 0.12kg/m
2Add diluent at 1: 0.5 according to volume ratio, and add the corresponding curing agent of volume ratio 100: 10～12, the back brushing that stirs, finish paint brush twice.
(7), maintenance
Generally speaking, construction finishes and get final product in back maintenance one week, but if environment is relatively poor, is lower than 5 ℃ or humidity greater than 85% as temperature, then prolongation;
(8), detect and check and accept
A, general provision
After each procedure of scale clay construction is finished, be intermediate survey all through checking, can carry out the construction of next process after qualified; The part of disqualified upon inspection must be reprocessed, and check once more, till being up to the standards; After all anticorrosive constructions are finished,, could check and accept after qualified through final inspection; Should reprocess when defective and check again;
B, intermediate survey
1) surface-treated check: adopt ocular estimate and roughness instrument detection method, quality reaches the regulation requirement;
2) detection after the coating brushing: adopt ocular estimate, quality requirement must not be holiday, the figure layer should be even, and brushless line, sagging, bubble, pinprick, micro-crack, foreign material defective do not allow to exist whiting yet or solidify incomplete situation;
3) check behind the daub mud: adopt ocular estimate, anticorrosion surfacing behind the daub mud or one-tenth rounding off;
C, final inspection
Final test item mainly contains open defect, pin hole test, thickness detection, hammering detection, and concrete grammar is as follows:
1) open defect inspection: adopt ocular estimate, figure layer evenly, and brushless line, sagging, bubble, pinprick, micro-crack, foreign material defective do not allow to exist whiting or solidify incomplete;
2) pin hole test: adopt the defective and the discontinuity point of direct current spark detector checkout coating, with do not produce disruptive spark, alarm free is qualified; Detect after twice clay construction finished, the detection voltage of 1.5mm scale lining is: 5000V;
3) test of thickness: utilize calibrator, in the surface measurements of whole coating, every square metre is no less than a point, and liner thickness reaches designing requirement;
4) sound test: touch coating surface with wooden mallet, any access point testing, the sound of the hollowing that do not have.
Because scale resin has unique anti-permeability performance on the structure of institute's composition material.Between apparatus body and corrosive medium, with the solid glass resin flake lining of one deck, make it to be not easy to be permeated by medium, realize desired anticorrosion purpose, in the corrosion-inhibiting coating resin, sneak into the scale filler, not only can improve its mechanical strength, reduce its linear expansion coefficient and cure shrinkage, but also the coating of very easy formation thick-slurry type.The adding of scale filler also can suppress the intrusion of corrosive medium widely.Adopt the high-temperature scale anticorrosion construction method for heat-engine plant desulfurizer of technique scheme, solved anti-corrosion material as adopting glass fibre, glass cloth etc. continuous distributed in resin, thereby make its residual stress, a thereby difficult problem that comes off easily bigger among a small circle.And suppressed the intrusion of corrosive medium effectively, and improved mechanical strength, reduced its linear expansion coefficient and cure shrinkage.And the long service life of its lining, shock resistance and erosion resistance are better than other materials, and local damage repairs easily, and room temperature (or low-temperature heat) is solidified, and easy construction has reached the saving duration, the purpose that reduces cost.
Can form moist subenvironment in the part with traditional flue-gas desulfurizing engineering, this subenvironment can cause the corrosion of certain chemistry and physics to the inwall of metal.Though some present anti-corrosion measures can be controlled the generation of corrosion to a certain extent, owing to reasons such as anticorrosion material, anticorrosion construction methods, cause the not very good and environmental protection of carrying out after the desulfurization of preservative treatment.This paper has proposed scale resin lining anticorrosive paint spraying method on the basis of simple elaboration chimney desulfurization antiseptic principle.
In sum, the present invention is that a kind of resistance to corrosion is strong, adhere to stablely, be not easy to come off the strong adhesion of glass flake lining, it is little to solidify after-contraction, the long service life of lining, shock resistance and erosion resistance are better than other materials, and local damage is repaired easily, room temperature (or low-temperature heat) is solidified, the high-temperature scale anticorrosion construction method for heat-engine plant desulfurizer of easy construction.
Description of drawings
Fig. 1 is interface, the end overlapping the slot schematic diagram of smearing.
The specific embodiment
The invention will be further described below in conjunction with the specific embodiment.
With the silver-colored Loudi gold Zhushan County's power plant desulfurization engineering construction of Datang China is example.
One, project profile
Gold Zhushan County, the silver-colored Loudi of Datang China power plant desulfurization engineering is positioned at the Hunan Lengshuijiang City, and by Datang Hua Yinjin Zhushan County power plant investment construction, its dynamo-electric cost is 1,100 ten thousand yuan, goes into operation in June, 2008, and be completed in July, 2009.
Main points of operation
(1), preliminary preparation
A, equipment scale resin antiseptic project matrix are made requirement
All weld seams of anticorrosion district must be continuous full weld, and seam then must be replenished inside weld as having only outside weld.All weld seams are answered forming, zero defect, and all weld seams must polish flat with abrasive machine.Matrix surface to be served as a contrast can not exist overlap and welding slag.
B, construction environment requirement
The job site environment temperature is not less than 5 ℃, and is higher than 3 ℃ of dew-point temperatures; Relative air humidity is not more than 85%.
C, derusting by sandblasting
Can produce a large amount of dusts during 1) owing to sandblast, therefore must be provided with ventilation equipment, guarantee workmen's safety, after the sandblast, should be at once that the cleaning of the dust on the matrix is clean, the cleaning of utensils such as available brush, pressure-air and dust catcher.
2) derusting by sandblasting (comprise quality examination and brush the first road priming paint) should be finished in 8h.
3), finish the way that can adopt segmentation and effectively isolate in can't be when 8h if engineering is because working face is bigger.Promptly earlier certain area is carried out derusting by sandblasting, brushes priming paint one through after the assay was approved, treat solidifying priming paint after, again to the remainder derusting by sandblasting, the reply this moment part of having primed is protected, and continues the distance that sandblast end should be reserved 50mm at least at it.Enable to intersect sandblast, thereby guarantee the quality of sandblast.
4) the desired credit rating of sandblast must reach the Sa2.5 level, promptly the surface is near the silvery white requirement of metal, remove all foreign material such as grease, oxide skin, corrosion product of metal surface fully, and remove dust with the compressed air or the brush of dust catcher, dried and clean.Remaining rust staining, oxide skin etc. cause that the area of light discolouration must not surpass 5% on the area of any 100 * 100mm2.Roughness should reach 40-70 μ m.
5) compressed air of sandblast employing is answered dried and clean, must not contain greasy dirt, foreign material and moisture, and pressure is 0.6-0.8Mpa.
6) particle diameter of sand grains is 2-3mm.
7) sandblast construction technology index is as follows
Nozzle diameter: 6-8mm; Jet angle: 30-75 degree; Spray distance: 80-200mm
(2) priming paint brushing
Get 120g/m
2Epoxy zinc rich primer mixes according to volume ratio with diluent at 1: 0.5, after stirring according to volume ratio 100: 10～12 ratios adding complete curing agent, brushes twice, consumption 170-200g/m with hairbrush or roller
2
(3) the scale clay smears
Get the scale clay mixes according to volume ratio with diluent at 1: 0.5, adding complete curing agent according to volume ratio 100: 10～12 ratios stirs, use after stirring evenly and leave standstill the about 15min of slaking after the batching, each scale clay that stirs is controlled in the 30min and uses up, and the presetting period should be controlled at 38～42min;
Coating on the basis of priming paint with scraper plate or the unidirectional material of will constructing equably of spatula, per pass construction thickness (after the initial set) is 1.0 ± 0.2mm, and the time interval that per pass is smeared is 12h.
After per pass scale clay is smeared, before initial set, must in time use the wool felt roll roll extrusion that speckles with styrene solvent till the perusal smooth surface evenly, the surface does not allow the trickling vestige, and roll extrusion is smooth again once producing.Two-layer clay smear finish and completion of cure after, test with the electric spark detector.
In work progress, construction surface should keep clean, and should polish flat if any thrust or construction tear drop.Butt joint should be avoided in the interface, end that secondary is smeared, and must take overlapping the slot 1 overlap joint, sees Fig. 1;
(4) repairing of scale clay layer
When pin hole, foreign material were found in check, the application wheel machine was removed its polishing, should polish to basal surface to the defective of pin hole or perforation lining, and become the domatic transition, and domatic angle with matrix should be less than 15 degree.After solvent washing and drying, should smear priming paint and scale clay again.Find that through check defectives such as holiday or local lining thickness deficiency are arranged, should this region surface is clean with solvent clean, smear the construction material after the drying once more and reach specific thickness.After scaffold was removed, its intersection point place should do corresponding repairing.
(5) local glass fiber cloth (felt) strengthens
Flue is served as a contrast the flange of all corner regions of zone, deflector, non-metal expansion joint and back employing glass fabric (felt) enhancing all should be solidified by the scale lining in the flange seal end of transition region and miscellaneous equipment, adapter etc., and the enhancement region width should be both sides and respectively is not less than 100mm.The handing-over material of small pieces of cloth used for patches glass fabric (felt) must adopt the resin preparation identical with scale lining clay.
The scale liner surface is polished flat, undertaken by the order of gluing-patch-gluing with the clean back of solvent washing, the lap of splice of glass fabric (felt) should be greater than 50mm.It is smooth that the lining flange sealing surface should keep, and glass fabric (felt) should be removed the burr of enhancement region after strengthening 12h.
(6) finish paint brushing
Should be after finishing the operation that priming paint brushing, scale clay are smeared, scale clay layer is repaired, glass fabric (felt) strengthens, the brushing finish paint.
Get epoxy resin varnish 0.12kg/m
2Add diluent at 1: 0.5 according to volume ratio, and add the corresponding curing agent of volume ratio 100: 10～12, the back brushing that stirs, finish paint brush twice.
(7) maintenance
Generally speaking, construction finishes and get final product in back maintenance one week, but relatively poor as if environment, is lower than 5 ℃ or humidity greater than 85% as temperature, then should prolong as one sees fit.
(8), detect and check and accept
A, general provision
After each procedure of scale clay construction is finished, be intermediate survey all through checking, can carry out the construction of next process after qualified; The part of disqualified upon inspection must be reprocessed, and check once more, till being up to the standards; After all anticorrosive constructions are finished,, could check and accept after qualified through final inspection; Should reprocess when defective and check again;
B, intermediate survey
1) surface-treated check: adopt ocular estimate and roughness instrument detection method, quality reaches the regulation requirement;
2) detection after the coating brushing: adopt ocular estimate, quality requirement must not be holiday, the figure layer should be even, and brushless line, sagging, bubble, pinprick, micro-crack, foreign material defective do not allow to exist whiting yet or solidify incomplete situation;
3) check behind the daub mud: adopt ocular estimate, anticorrosion surfacing behind the daub mud or one-tenth rounding off;
C, final inspection
Final test item mainly contains open defect, pin hole test, thickness detection, hammering detection, and concrete grammar is as follows:
1) open defect inspection: adopt ocular estimate, figure layer evenly, and brushless line, sagging, bubble, pinprick, micro-crack, foreign material defective do not allow to exist whiting or solidify incomplete;
2) pin hole test: adopt the defective and the discontinuity point of direct current spark detector checkout coating, with do not produce disruptive spark, alarm free is qualified; Detect after twice clay construction finished, the detection voltage of 1.5mm scale lining is: 5000V;
3) test of thickness: utilize calibrator, in the surface measurements of whole coating, every square metre is no less than a point, and liner thickness reaches designing requirement;
4) sound test: touch coating surface with wooden mallet, any access point testing, the sound of the hollowing that do not have.
Two, condition of construction
Gold Zhushan County, the silver-colored Loudi of Datang China power plant desulfurization engineering, the anticorrosion worker's method of scale resin lining has been adopted in the oil tank of this project, flue, absorption tower preservative treatment, after this project is gone into operation operation in the July, 2009, adopt the device of the anticorrosion worker's method of scale resin lining to eliminate corrosion phenomenon, the maintenance cost that produces because of corrosion is zero, for this project is directly saved on the cost 100,000 yuan.And in work progress economic benefit we be example with the accident slurries case of its oil tank:
It is 825m that its accident slurries case need be coated with the scale resin area, is the strong corrosion that waits, as calculated, as follows with epoxy coating, epoxy coking coal coating economic efficiency contrast table:
| Project | Scale resin | Epoxy resin | Tar resin |
| Fee of material (unit/m 2) | ??136950 | ??175725 | ??225225 |
| Labour cost (unit/m 2) | ??63525 | ??77550 | ??84975 |
| Project | Scale resin | Epoxy resin | Tar resin |
| Amount to (unit/m 2) | ??200475 | ??253275 | ??310200 |
| Save cost rate | ??0 | ??30％ | ??36％ |
Claims (2)
1. high-temperature scale anticorrosion construction method for heat-engine plant desulfurizer, may further comprise the steps: basic handling, priming paint brushing, first pass scale clay smear, second time scale clay smeared, polish flat, locally strengthen, anti-wear mortar is smeared, finish paint brushing, inspection eventually, it is characterized in that:
(1), basic handling
A, equipment scale resin antiseptic project matrix are made requirement
1) physical dimension of equipment and intensity adhere to specification;
2) then be the one-time-concreting moulding if any concrete surface, do not allow to use plain sand finish;
3) matrix must be closely knit, smooth, dusting must not be arranged, flakes, crack, voids and pits and greasy dirt;
4) the concrete surface cavity of the exposing reinforcing bar cast of must being in the milk again reaches closely knit smooth, and pre-buried steel member face of weld is level and smooth, no undercut, overlap, dreg defect;
5) the extremely mild transition of hour polishing of template fissure of displacement size, bigger as fissure of displacement size, then polish to arc transition;
6) gradient in liquid overcurrent zone must adhere to specification;
7) basic unit must be dry, and the moisture content in degree of depth 20mm is not more than 6%;
8) more than inner corner trim arc transition R＞10mm, more than external corner arc transition R＞5mm;
9) all weld seams of anticorrosion district must be continuous full weld, and seam then must be replenished inside weld as having only outside weld;
10) good, the zero defect of all appearances of weld, all weld seams must polish flat with abrasive machine, and matrix surface to be served as a contrast can not exist overlap and welding slag;
B, construction safeguard
1) the job site environment temperature is not less than 5 ℃, and is higher than 3 ℃ of dew-point temperatures; Relative air humidity is not more than 85%;
2) reasonably workmen and facility configuration, the diversification dynamic management is carried out in effectively construction management measure;
3) under the normal condition, the construction of relieving of branch construction team;
4) if environmental aspect does not reach that above construction environment requires and duration when nervous, will set up the constant temperature dehumidification device, to guarantee the requirement of environment to construction;
C, derusting by sandblasting
Can produce a large amount of dusts during 1) owing to sandblast, therefore must be provided with ventilation equipment, guarantee workmen's safety, after the sandblast, should be at once that the cleaning of the dust on the matrix is clean, clear up with brush, pressure-air and dust catcher utensil;
2) derusting by sandblasting comprises quality examination and brushes the first road priming paint and finish in 8h;
3) if engineering is because working face is bigger, finish in can't be when 8h, the way that adopts segmentation and effectively isolate is promptly earlier carried out derusting by sandblasting to certain area, brushes one priming paint through after the assay was approved, after treating solidifying priming paint, to the remainder derusting by sandblasting, protected the part of priming this moment, and continue the distance that the sandblast end is reserved 50mm at least at it again, enable to intersect sandblast, thereby guarantee the quality of sandblast;
4) the desired credit rating of sandblast must reach the Sa2.5 level, promptly the surface is near the silvery white requirement of metal, remove grease, oxide skin, the corrosion product of metal surface fully, and remove dust with the compressed air of dust catcher, dried and clean or brush, remaining rust staining, oxide skin cause that the area of light discolouration is at any 100 * 100mm
2Area on must not surpass 5%, roughness should reach 40-70 μ m;
5) the compressed air drying cleaning of sandblast employing must not contain greasy dirt, foreign material and moisture, and pressure is 0.6-0.8Mpa;
6) particle diameter of sand grains is 2-3mm;
7) sandblast construction technology index: nozzle diameter: 6-8mm; Jet angle: 30-75 degree; Spray distance: 80-200mm;
(2), priming paint brushing
Get 120g/m
2Epoxy zinc rich primer mixes according to volume ratio with diluent at 1: 0.5, after stirring according to volume ratio 100: 10～12 ratios adding complete curing agent, brushes twice, consumption 170-200g/m with hairbrush or roller
2
(3), the scale clay smears
A, get the scale clay and mix at 1: 0.5 according to volume ratio with diluent, adding complete curing agent according to volume ratio 100: 10～12 ratios stirs, use after stirring evenly and leave standstill the about 15min of slaking after the batching, each scale clay that stirs is controlled in the 30min and uses up, and the presetting period should be controlled at 38～42min;
B, coating on the basis of priming paint with the unidirectional material of will constructing equably of scraper plate or spatula, is 1.0 ± 0.2mm after the initial set of per pass construction thickness, and the time interval that per pass is smeared is 12h;
After C, per pass scale clay are smeared, before initial set, must in time use the wool felt roll roll extrusion that speckles with styrene solvent till the perusal smooth surface evenly, the surface does not allow the trickling vestige, and roll extrusion again is smooth once producing; Two-layer clay smear finish and completion of cure after, test with the electric spark detector; In work progress, construction surface keeps clean, and polishes flat if any thrust or construction tear drop;
Butt joint is avoided at the interface, end that D, secondary are smeared, and must take overlapping the slot (1) mode to overlap;
(4), the repairing of scale clay layer
A, when pin hole, foreign material are found in check, with abrasive machine its polishing is removed, pin hole or the defective that connects lining are polished to basal surface, and become the domatic transition, the angle of domatic and matrix is less than 15 degree; After styrene solvent flushing and drying, smear priming paint and scale clay again; Find to have holiday or the not enough defective of local lining thickness through check, this region surface is cleaned up with styrene solvent, smear the construction material after the drying once more and reach specific thickness;
After B, scaffold were removed, its intersection point place did corresponding the repairing;
(5), local glass fiber cloth or felt strengthen
The flange seal end that A, flue are served as a contrast the flange of all corner regions of zone, deflector, non-metal expansion joint and transition region and miscellaneous equipment, adapter is solidified the back by the scale lining and is adopted glass fabric or felt to strengthen, the enhancement region width is that both sides respectively are not less than 100mm, and the handing-over material of small pieces of cloth used for patches glass fabric or felt must adopt the epoxy resin preparation identical with scale lining clay;
B, the scale liner surface is polished flat, rinse the back well with styrene solvent and undertaken by the order of gluing-patch-gluing, the lap of splice of glass fabric or felt is greater than 50mm, and it is smooth that the lining flange sealing surface keeps, glass fabric or felt after strengthening 12h are removed the burr of enhancement region;
(6), finish paint brushing
A, finish that priming paint brushing, scale clay are smeared, after the operation that the repairing of scale clay layer, glass fabric or felt strengthen, the brushing finish paint;
B, get epoxy resin varnish 0.12kg/m
2Add diluent at 1: 0.5 according to volume ratio, and add the corresponding curing agent of volume ratio 100: 10～12, the back brushing that stirs, finish paint brush twice.
(7), maintenance
Generally speaking, construction finishes and get final product in back maintenance one week, but relatively poor as if environment, is lower than 5 ℃ or humidity greater than 85% as temperature, then should prolong as one sees fit.
(8), detect and check and accept.
2. high-temperature scale anticorrosion construction method for heat-engine plant desulfurizer according to claim 1 is characterized in that: described step (8) detects and checks and accepts:
A, general provision
After each procedure of scale clay construction is finished, all should be intermediate survey through check, can carry out the construction of next process after qualified, the part of disqualified upon inspection must be reprocessed, and check once more, till being up to the standards, after all anticorrosive construction is finished, should pass through final inspection, could check and accept after qualified, reprocess when defective and check again;
B, intermediate survey
1) surface-treated check: adopt ocular estimate and roughness instrument detection method, quality reaches the regulation requirement;
2) detection after the coating brushing: adopt ocular estimate, quality requirement must not be holiday, the figure layer should be even, and brushless line, sagging, bubble, pinprick, micro-crack, foreign material defective do not allow to exist whiting yet or solidify incomplete situation;
3) check behind the daub mud: adopt ocular estimate, anticorrosion surfacing behind the daub mud or one-tenth rounding off;
C, final inspection
Final test item mainly contains open defect, pin hole test, thickness detection, hammering detection, and concrete grammar is as follows:
1) open defect inspection: adopt ocular estimate, figure layer evenly, and brushless line, sagging, bubble, pinprick, micro-crack, foreign material defective do not allow to exist whiting yet or solidify incomplete;
2) pin hole test: adopt the defective and the discontinuity point of direct current spark detector checkout coating, with do not produce disruptive spark, alarm free is qualified, detects after twice clay construction finished, the detection voltage of 1.5mm scale lining is: 5000V;
3) test of thickness: utilize calibrator, in the surface measurements of whole coating, every square metre is no less than a point, and liner thickness should reach designing requirement;
4) sound test: touch coating surface with wooden mallet, any access point testing, the sound of the hollowing that do not have.
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