CN110961063A - Photocuring nano anticorrosive material for desulfurization system and construction process thereof - Google Patents
Photocuring nano anticorrosive material for desulfurization system and construction process thereof Download PDFInfo
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Abstract
The invention relates to the field of anticorrosive materials, in particular to a photocuring nano anticorrosive material for a desulfurization system and a construction process thereof, and the photocuring nano anticorrosive material is characterized in that: the light-cured nano sheet material comprises a carbon steel substrate lining and a concrete lining, wherein the carbon steel substrate lining sequentially comprises a nano bottom coating, a light-cured nano sheet material layer and a nano sealing coating from inside to outside, and the concrete lining comprises an epoxy sealing bottom coating and a nano composite daub layer. The photocuring nano anticorrosive material for the desulfurization system has the advantages of strong chemical corrosion resistance, corrosion medium permeability resistance, wear resistance, scouring resistance and tensile elongation at break, high construction uniformity, low construction difficulty, low technical requirements on constructors, stable construction quality, difficulty in cracking, low liner thickness and weight, no formation of large weight load, difficulty in falling and peeling of the liner for the desulfurization system with vibration, and difficulty in cracking and separation due to the adoption of a superposition process at the joint of photocuring sheets of the carbon steel substrate liner.
Description
Technical Field
The invention relates to the field of anticorrosive materials, in particular to a photocuring nano anticorrosive material for a desulfurization system and a construction process thereof.
Background
The light cured nanometer anticorrosive material engineering for desulfurizing system includes various devices and facilities of absorption tower, flue, tank, water pond, etc. as well as concrete base material. In the lime slurry wet desulphurization, the inlet temperature of the flue gas is generally 70-100 ℃, and the outlet temperature is 30-70 ℃, so that the corrosive medium in the flue gas mainly comprises sulfur dioxide, sulfurous acid and sulfuric acid, and part of the mixed acid in the flue gas, such as nitric acid and hydrofluoric acid, is generally low in concentration but complex in components. Besides acid mist corrosion, the inside of the absorption tower is subjected to scouring wear and corrosion of the desulfurization slurry. Therefore, the lining layer must have strong chemical resistance, corrosion medium permeability resistance, wear resistance, erosion resistance, tensile elongation at break, substrate adhesion and certain temperature resistance.
The prior art generally adopts scale daub, vulcanized rubber plates or glass fiber reinforced plastic linings, but the scale daub has higher construction difficulty, difficult achievement of construction uniformity and high technical requirement on constructors, causes extremely unstable construction quality and difficult resistance to the osmotic corrosion of acid mist and desulfurization slurry; the scale daub is relatively fragile and easy to crack; meanwhile, the daub can show the anti-seepage effect only by being coated to a certain thickness, and the thickness also forms a larger weight load, so that the anti-corrosion lining is easy to peel off and fall off particularly in a desulfurization system with vibration; the vulcanized rubber plate is more difficult to construct, bubbles are easy to generate in the construction process, the rubber plate joint is easy to crack and separate, and meanwhile, the joint is the weakest link of corrosion prevention of the rubber plate; the vinyl resin used by the glass fiber reinforced plastic is generally difficult to resist corrosive media with complex components for a long time, and various corrosive ions in the media easily penetrate through the crosslinked network of the glass fiber reinforced plastic, so that the base material is rusted back, and the anti-corrosion lining layer is peeled off, peeled, swelled and cracked. Accordingly, the present disclosure has been made.
Disclosure of Invention
The invention aims to solve the technical problem of providing a photocuring nano anticorrosive material for a desulfurization system and a construction process thereof, so as to solve the problems in the background art.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a photocurable nano anticorrosive material for a desulfurization system, comprising:
-a carbon steel substrate lining covering the carbon steel substrate of the original flue, the clean flue, the absorption tower conventional area, the absorption tower high wear area, the absorption tower inlet high temperature area and the slurry tank of the flue gas desulfurization system, the carbon steel substrate lining comprising a nano undercoat layer, a photo-cured nano sheet layer and a nano seal coating in this order from inside to outside;
-a concrete lining overlying the concrete substrate of the pool, trench and cofferdam, said concrete lining comprising an epoxy seal primer and a nanocomposite daub layer.
Preferably, the nano primer layer is formed by two painting, and the thickness of the nano primer layer is 60 to 80 μm.
Preferably, the thickness of the photocuring nano sheet layer of the original flue, the clean flue, the absorption tower conventional area, the absorption tower inlet high-temperature area and the slurry tank is 1.6-1.8mm, the thickness of the absorption tower high-abrasion area is 2.0-2.4mm, and it is required to indicate that the thickness of the photocuring nano sheet layer refers to the thickness of a single layer, and the thickness of double-layer or multi-layer photocuring nano sheet layers at the lap joint is increased by a multiple of the single layer.
Preferably, the thickness of the nano sealing coating is 200-220 μm.
Preferably, the epoxy sealing primer layer is formed by two-time coating, and the thickness of the epoxy sealing primer layer is 140-160 μm.
Preferably, the nano composite daub layer is formed by two times of smearing, and the thickness of the nano composite daub layer is 1500-1600 μm.
The construction process of the photocuring nano anticorrosive material for the desulfurization system comprises a carbon steel base material lining construction process and a concrete lining construction process;
the construction process of the carbon steel substrate lining comprises the following steps:
step one, carbon steel base material treatment: comprehensively polishing a carbon steel substrate, removing welding slag, welding beading and splashes on a base surface, polishing and flattening the internal and external corners, welding seams, sharp edges of sharp corners, pipe joints and the like of equipment or performing circular arc smooth transition, and performing sand blasting and rust removal on Sa2.5 grade or St3 grade; cleaning and dust absorption are carried out on the base surface, and a thinner or a cleaner is recommended to be adopted for wiping once in a whole manner, so that residual oil stains and sand grains are removed; the surface of the treated product is clean and dry without dust, oil stain and other chemical media; the sand blasting rust removal, the cleaning dust removal and the first primary coat construction are finished within 1-8 hours so as to prevent the substrate from returning rust and repeated pollution;
step two, construction of a nano base coat: smearing a second nano-composite emulsion base coat, wherein the standard dosage of each nano-composite emulsion base coat is 0.07kg/m2 nano-composite emulsion base coat, a curing agent is added into each nano-composite emulsion base coat according to the weight percentage of 1.0-3.0 percent of each nano-composite emulsion base coat, and the thickness of the dried film is 60-80 mu m;
step three, construction of a photocuring nano sheet layer: cutting the photocuring nano sheet according to the actual area size coated with the base coat, sticking the cut sheet sticking surface film with the base coat while uncovering, and uniformly applying force to ensure that the sheet is completely and tightly attached to the coating as much as possible, wherein the sheet cannot be directly trodden on the sheet during sticking so as to avoid damaging the sheet; and after the sheet is pasted, curing by adopting a lamp set, wherein the curing time of the single-layer sheet area is about 5-10min, and the curing time of the double-layer area is 15-20 min.
Construction of the lap joint of the photocuring nano sheet: when in lapping, the upper layer film is uncovered, the sheets are lapped together, the uncovered upper layer film is covered and pressed, the section arc of the lapping part is in smooth transition, the lapping length is not less than 50mm, and the lapping openings between adjacent sections are staggered to prevent the overlapping from being on the same straight line, so as to prevent multiple lapping;
step four, construction of the nano sealing coating: smearing a layer of nano sealing emulsion, wherein the standard dosage of the nano sealing emulsion is 0.35kg/m2, a curing agent is added into the nano sealing emulsion according to the weight percentage of 1.0-3.0 percent, the thickness of a dry film is 200-220 mu m, and the construction of the nano sealing coating can adopt brush coating, troweling or spraying;
the concrete lining construction process comprises the following steps:
step a, treating a concrete base material: comprehensively polishing, cleaning basal slag blocks, crusts, loose and convex parts until a firm and compact layer is achieved, and flattening the surface; polishing or repairing the internal and external corners, sharp edges of sharp corners, pipe joints and the like to form circular arc smooth transition; the base layer which is not dried completely locally needs to be dried, and air circulation is enhanced, so that the water content in the base layer with the depth of 20mm is not more than 6%; sealing the place with serious leakage by using a reinforcing leakage repairing agent; surface pretreatment such as flame baking and solvent wiping should be carried out on the polluted or corroded surface; if the base layer has the requirement of the infiltration crystallization waterproof treatment, the base material is treated in advance before the infiltration crystallization process; the surface of the treated product should be clean and dry, and free of dust, oil stain and other chemical media
B, epoxy sealing bottom coating construction: coating two epoxy sealing non-metal primers, wherein the standard dosage of each epoxy sealing non-metal primer is 0.15kg/m2, the component proportion of A, B is 2:1, the thickness of the epoxy sealing primer is 140-;
c, construction of the nano composite clay layer: and (2) blade-coating two layers of nano-composite daub, wherein the standard dosage of the nano-composite daub is 1.3kg/m2, the weight ratio of A to B to C is 20: 3.5-5: 30, the thickness is 1500-1600 mu m, the coating method adopts a spatula, a scraping plate or a trowel, the spatula or the scraping plate is used for uniformly coating along the same direction at a certain angle, and the coating is compacted, compressed and flattened so as to be full and flat, and the re-coating interval is 8 hours-7 days. .
Furthermore, in the construction of the nanometer base coat, the coating construction can adopt roller coating, brush coating, troweling or spraying, the time interval between the first coating construction and the second coating construction is 3 hours to 7 days, if pits, cracks, holes and areas which are difficult to polish to be smooth or have smooth transition of circular arcs exist on the base material, the nanometer composite emulsion base coat and quartz powder or putty prepared by modified resin and quartz powder can be used for repairing and leveling after the nanometer base coat construction, and the repaired part of the putty needs to be timely leveled by a felt roller which is stained with a thinner before initial setting, or the surface is polished to be smooth after the putty is cured.
Further, in the construction of the light-cured nano sheet layer, the width of the raw material of the sheet is 1040mm, the length of the sheet is 8m or 10 m/roll, the sheet can be cut and cut at will, and can also be combined in a lap joint manner, and the construction standard dosage of the light-cured nano sheet layer is as follows: the conventional area is 2.7kg/m2, and the thickness is 1.6-1.8 mm; the high wear area was 3.6kg/m2 with a thickness of 2.0-2.2 mm.
As can be seen from the above description, the photo-curing nano anticorrosive material for desulfurization system and the construction process thereof provided by the invention have the following beneficial effects:
the photocuring nano anticorrosive material for the desulfurization system is divided into a carbon steel base material lining and a concrete lining according to different base materials, wherein the carbon steel base material lining is suitable for high-temperature and high-abrasion carbon steel base materials such as a flue, an absorption tower and a slurry tank of a flue gas desulfurization system, and the concrete lining is suitable for concrete base materials such as a pool, a groove and a cofferdam, and has good adhesive force and temperature resistance aiming at different base materials and use scenes.
The carbon steel substrate lining sequentially comprises a nano bottom coating, a photocuring nano sheet layer and a nano sealing coating from inside to outside, and the concrete lining comprises an epoxy sealing bottom coating and a nano composite daub layer, so that the carbon steel substrate lining has high chemical corrosion resistance, high corrosion medium permeability, high wear resistance, high scouring resistance and high tensile elongation at break.
And thirdly, the construction uniformity is high, the construction difficulty is low, the technical requirements on constructors are low, the construction quality is stable, and the cracking is not easy.
And fourthly, the thickness and the weight of the lining are low, larger weight load cannot be formed, the lining is not easy to fall off and peel off for a desulfurization system with vibration, and the joint of the photocuring sheet of the carbon steel substrate lining is not easy to crack and separate by adopting a superposition process.
Detailed Description
The invention is further described below by means of specific embodiments.
The invention relates to a photocuring nano anticorrosive material for a desulfurization system, which comprises the following components:
a carbon steel substrate lining covering the carbon steel substrate of the original flue, the clean flue, the absorption tower conventional area, the absorption tower high wear area, the absorption tower inlet high temperature area and the slurry tank of the flue gas desulfurization system, the carbon steel substrate lining comprising a nano undercoat layer, a photo-cured nano sheet layer and a nano seal coating in sequence from inside to outside (from the carbon steel substrate to the outside);
wherein, the nanometer bottom coating is formed by two times of coating, the thickness of the nanometer bottom coating is 60-80 μm, preferably 70 μm, the thickness of the light-cured nanometer sheet layer of the original flue, the clean flue, the conventional area of the absorption tower, the high-temperature area of the inlet of the absorption tower and the slurry tank is 1.6-1.8mm, preferably 1.8mm, and the thickness of the high-abrasion area of the absorption tower is 2.0-2.4mm, preferably 2.4 mm. The thickness of the nano-sealing coating is 200-220 μm, preferably 210 μm.
Preferably, the carbon steel substrate lining is designed to have a normal thickness area (referring to non-high-abrasion parts such as a raw flue, a clean flue, a normal area of an absorption tower, a high-temperature area at the inlet of the absorption tower, a slurry tank and the like) and a medium-abrasion area (referring to a high-abrasion area of the absorption tower) of about 2080um, the high-abrasion area is about 2680 μm, and the design service life is 10-15 years.
A concrete lining covering the concrete base material of the basin, the trench and the cofferdam, the concrete lining comprising, in order from the inside outwards (from the outside of the concrete base material), an epoxy seal primer and a nanocomposite daub layer.
Wherein, the epoxy sealing bottom coating is formed by two times of coating, the thickness of the epoxy sealing bottom coating is 140-160 μm, preferably 150 μm, the nano composite daub layer is formed by two times of coating, and the thickness of the nano composite daub layer is 1500-1600 μm, preferably 1520 μm.
Preferably, the overall design thickness of the concrete lining is about 1670um, and the design service life is 8-10 years.
The nano bottom coating, the light-cured nano sheet layer, the nano sealing coating, the epoxy sealing bottom coating and the nano composite daub layer are related products of new material Shishi Huabao Co., Ltd, and specific models can refer to company handbooks and official nets, wherein the light-cured nano sheet layer is a light-cured nano sheet series product, and the nano bottom coating, the nano sealing coating, the epoxy sealing bottom coating and the nano composite daub layer are a nano composite heavy-duty anticorrosion series product.
Photocuring nano sheet series products: is formed by hybridization and compounding of various nano-scale corrosion-resistant and impervious materials, and is a multifunctional photocuring fiber reinforced composite material. The product appearance is the pellicular sticky tape form, the quality is light, it is simple and convenient swift to construct, can be according to the engineering needs, cut or tailor into various shapes, paste, twine, wrap up on waiting to protect or prosthetic basic unit, the high molecule is cross-linked fast and cured under the sunlight or ultraviolet lamp irradiation and shaped, the curing time is only 5-20 minutes, almost no solvent volatilizees, the work progress need not electric welding, fire, can construct throughout the year, need not to maintain, can put into use immediately after the construction, reduce the construction time, construction degree of difficulty and cost of labor by a wide margin.
After curing, the anticorrosive fireproof insulating jacket layer with high strength, high adhesion, high temperature resistance and seamless sealing is formed, and the mechanical property of the insulating jacket layer can be comparable to that of a metal material. The product has excellent chemical corrosion resistance, temperature resistance and long service life, has good resistance to corrosion of most acids, alkalis, salts, various oils, organic solvents, seawater, soil and the like, the shell is completely sealed in a seamless manner, no connecting part for leading water, gas and corrosive media to enter and exit is arranged, the permeation and convection of the corrosive media inside and outside the layer or the air can be fundamentally avoided, the long-term stability of the base material is ensured, and good effects of corrosion resistance, protection, reinforcement and the like are provided. Is suitable for heavy-duty anticorrosion, temperature-resistant, wear-resistant, scouring-resistant, crack-resistant and impact-resistant systems.
Nano composite heavy anti-corrosion series products: the composite material is a nano-scale organic-inorganic hybrid composite material, has the characteristics of excellent chemical corrosion resistance, nano-scale corrosion-resistant medium permeability, excellent mechanical strength and performance, excellent base material adhesion, high temperature resistance, heat shock resistance, low thermal expansion coefficient, high electric heating insulativity, high ageing resistance, long service life, excellent construction and maintenance convenience and the like, can replace the traditional processes of lining glue, lining plastic, lining polyurea, scale cement, granite, acid-resistant ceramic tiles, acid-resistant cement, furan, vinyl, epoxy resin hand-pasted glass steel and the like, and is suitable for high and low temperature environment places. The special anti-seepage reinforced inorganic nano material of the hollow waxberry type forms a nano-scale sealing protection net with extremely high chemical compactness and excellent mechanical property on the surface and the inner layer of the lining layer in an excellent particle form, so that the penetration of molecules, ions and gas in a corrosive medium is isolated to the greatest extent, and the problems of stripping, falling, swelling, cracking and the like of the lining layer caused by rust return are solved. The double electric layer supermolecule nano material has two laminated plates with positive and negative charges, has extremely strong repulsion action on negative and positive ions in a corrosive medium respectively, and can effectively prevent the corrosive ions from contacting with a base material.
The nano bottom coating, the photo-curing nano sheet layer, the nano sealing coating, the epoxy sealing bottom coating and the nano composite clay layer are selected from the following product types:
an original flue: two nano-primer layers 8241A + a layer of 1.8mm light-cured nano-sheet 9130-S8+ a nano-seal coating layer 8244-05
Cleaning a flue: two nano-primer layers 8231A + a layer of 1.8mm light-cured nano-sheet 9130-S8+ a nano-seal coating layer 8234-05
Absorption column conventional zone: two nano-base coats 8231A +, a layer of 1.8mm photocuring nano-sheet 9130+ a nano-seal coating 8234-05
High abrasion area of absorption tower: two nano-base coats 8231A +, a 2.4mm photocuring nano-sheet layer 9130 and a nano-sealing coating layer 8234-05
High-temperature zone at the inlet of the absorption tower: two nano-base coats 8241A +, a layer of 1.8mm photocuring nano-sheet 9130+ one nano-seal coating 8244-05
Slurry tank: two nano-primer layers 8231A + a layer of 1.8mm light-cured nano-sheet 9130-S8+ a nano-seal coating layer 8234-05
Pool, trench and cofferdam: and two sealing primer coats of 82-29+ two nano composite daub WA 707.
The construction process of the photocuring nano anticorrosive material for the desulfurization system comprises a carbon steel base material lining construction process and a concrete lining construction process;
the construction process of the carbon steel substrate lining comprises the following steps:
step one, carbon steel base material treatment: comprehensively polishing a carbon steel substrate, removing welding slag, welding beading and splashes on a base surface, polishing and flattening the internal and external corners, welding seams, sharp edges of sharp corners, pipe joints and the like of equipment or performing circular arc smooth transition, and performing sand blasting and rust removal on Sa2.5 grade or St3 grade; cleaning and dust absorption are carried out on the base surface, and a thinner or a cleaner is recommended to be adopted for wiping once in a whole manner, so that residual oil stains and sand grains are removed; the surface of the treated product is clean and dry without dust, oil stain and other chemical media; the sand blasting rust removal, the cleaning dust removal and the first primary coat construction are finished within 1-8 hours so as to prevent the substrate from returning rust and repeated pollution;
step two, construction of a nano base coat: smearing a second nano-composite emulsion base coat, wherein the standard dosage of each nano-composite emulsion base coat is 0.07kg/m2 nano-composite emulsion base coat, a curing agent is added into each nano-composite emulsion base coat according to the weight percentage of 1.0-3.0 percent of each nano-composite emulsion base coat, and the thickness of the dried film is 60-80 mu m; the nanometer base coat can form chemical bond with metal base material, has strong adhesive force to the metal base material, and has high temperature resistance and tensile elongation at break.
Step three, construction of a photocuring nano sheet layer: cutting the photocuring nano sheet according to the actual area size coated with the base coat, sticking the cut sheet sticking surface film with the base coat while uncovering, and uniformly applying force to ensure that the sheet is completely and tightly attached to the coating as much as possible, wherein the sheet cannot be directly trodden on the sheet during sticking so as to avoid damaging the sheet; and after the sheet is pasted, an LED-50W lamp group or a Philips HPA-400S lamp group is adopted for curing, the curing time of a single-layer sheet region is about 5-10min, and the curing time of a double-layer region is 15-20 min.
Construction of the lap joint of the photocuring nano sheet: when in lapping, the upper layer film (the length is not less than 50mm) is uncovered, the sheets are lapped together, the uncovered upper layer film is covered and pressed tightly (the rolling by using a tool) so that the section of a lapping part is in smooth transition, the lapping length is not less than 50mm, and lapping openings between adjacent sections are staggered so as to be not on the same straight line, thereby preventing multiple lapping;
step four, construction of the nano sealing coating: smearing a layer of nano sealing emulsion, wherein the standard dosage of the nano sealing emulsion is 0.35kg/m2, a curing agent is added into the nano sealing emulsion according to the weight percentage of 1.0-3.0 percent, the thickness of a dry film is 200-220 mu m, and the construction of the nano sealing coating can adopt brush coating, troweling or spraying; because of the excellent sealing property of the sealing coating, multiple constructions are not suggested, and the sealing coating can form a nano-scale sealing protection net with extremely high consistency and excellent mechanical property on the surface of a paint film due to the unique sealing function, and can isolate the permeation of molecules, ions and gases in a corrosive medium.
The concrete lining construction process comprises the following steps:
step a, treating a concrete base material: comprehensively polishing, cleaning basal slag blocks, crusts, loose and convex parts until a firm and compact layer is achieved, and flattening the surface; polishing or repairing the internal and external corners, sharp edges of sharp corners, pipe joints and the like to form circular arc smooth transition; the base layer which is not dried completely locally needs to be dried, and air circulation is enhanced, so that the water content in the base layer with the depth of 20mm is not more than 6%; sealing the place with serious leakage by using a reinforcing leakage repairing agent; surface pretreatment such as flame baking and solvent wiping should be carried out on the polluted or corroded surface; if the base layer has the requirement of the infiltration crystallization waterproof treatment, the base material is treated in advance before the infiltration crystallization process; the surface should be clean and dry after treatment without dust, oil stain and other chemical media.
B, epoxy sealing bottom coating construction: smearing two epoxy sealing non-metal primers, wherein the standard dosage of each epoxy sealing non-metal primer is 0.15kg/m2, the component proportion of A, B is 2:1, the thickness of the epoxy sealing primer is 140-;
c, construction of the nano composite clay layer: and (2) blade-coating two layers of nano-composite daub, wherein the standard dosage of the nano-composite daub is 1.3kg/m2, the weight ratio of A to B to C is 20: 3.5-5: 30, the thickness is 1500-1600 mu m, the coating method adopts a spatula, a scraping plate or a trowel, the spatula or the scraping plate is used for uniformly coating along the same direction at a certain angle, and the coating is compacted, compressed and flattened so as to be full and flat, and the re-coating interval is 8 hours-7 days.
In the construction of the nanometer base coat, the coating construction can adopt roller coating, brush coating, troweling or spraying, the time interval between the first coating construction and the second coating construction is 3 hours-7 days, if the base material has pits, cracks, holes and areas which are difficult to polish to be smooth or have smooth transition of circular arcs during treatment, the nanometer base coat can be repaired and leveled by using the nanometer composite emulsion base coat and quartz powder (the weight part formula is 20-30 parts of the nanometer composite emulsion base coat and 50-60 parts of the quartz powder) or putty prepared by blending the modified resin 1230 and the quartz powder (the weight part formula is 20-30 parts of the modified resin and 50-60 parts of the quartz powder), and the repaired part of the putty needs to be smoothed by a felt roller which is stained with a diluent before initial setting or the surface is polished to be smooth after the putty is cured.
In the construction of the light-cured nanometer sheet layer, the width of the raw material of the sheet is 1040mm, the length is 8m or 10 m/roll, the sheet can be cut and cut at will, and can also be combined in a lap joint way, and the construction standard dosage of the light-cured nanometer sheet layer is as follows: the conventional area is 2.7kg/m2, and the thickness is 1.6-1.8 mm; the high wear area was 3.6kg/m2 with a thickness of 2.0-2.2 mm.
The photo-curing nano anticorrosive material for the desulfurization system and the construction process thereof provided by the invention have the following beneficial effects:
the photocuring nano anticorrosive material for the desulfurization system is divided into a carbon steel base material lining and a concrete lining according to different base materials, wherein the carbon steel base material lining is suitable for high-temperature and high-abrasion carbon steel base materials such as a flue, an absorption tower and a slurry tank of a flue gas desulfurization system, and the concrete lining is suitable for concrete base materials such as a pool, a groove and a cofferdam, and has good adhesive force and temperature resistance aiming at different base materials and use scenes.
The carbon steel substrate lining sequentially comprises a nano bottom coating, a photocuring nano sheet layer and a nano sealing coating from inside to outside, and the concrete lining comprises an epoxy sealing bottom coating and a nano composite daub layer, so that the carbon steel substrate lining has high chemical corrosion resistance, high corrosion medium permeability, high wear resistance, high scouring resistance and high tensile elongation at break.
And thirdly, the construction uniformity is high, the construction difficulty is low, the technical requirements on constructors are low, the construction quality is stable, and the cracking is not easy.
And fourthly, the thickness and the weight of the lining are low, larger weight load cannot be formed, the lining is not easy to fall off and peel off for a desulfurization system with vibration, and the joint of the photocuring sheet of the carbon steel substrate lining is not easy to crack and separate by adopting a superposition process.
The above description is only a few specific embodiments of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by the design concept should fall within the scope of the present invention.
Claims (9)
1. A photocurable nano anticorrosive material for a desulfurization system, comprising:
-a carbon steel substrate lining covering the carbon steel substrate of the original flue, the clean flue, the absorption tower conventional area, the absorption tower high wear area, the absorption tower inlet high temperature area and the slurry tank of the flue gas desulfurization system, the carbon steel substrate lining comprising a nano undercoat layer, a photo-cured nano sheet layer and a nano seal coating in this order from inside to outside;
-a concrete lining covering the concrete substrate of the basin, the trench and the cofferdam, said concrete lining comprising, in sequence from the inside outwards, an epoxy sealing primer and a layer of nanocomposite mastic.
2. The photo-curing nano anticorrosive material for desulfurization system according to claim 1, characterized in that: the nano base coat is formed by coating twice, and the thickness of the nano base coat is 60-80 mu m.
3. The photo-curing nano anticorrosive material for desulfurization system according to claim 1, characterized in that: the thickness of the photocuring nano sheet layer of the original flue, the clean flue, the absorption tower conventional area, the absorption tower inlet high-temperature area and the slurry tank is 1.6-1.8mm, and the thickness of the absorption tower high-abrasion area is 2.0-2.4 mm.
4. The photo-curing nano anticorrosive material for desulfurization system according to claim 1, characterized in that: the thickness of the nano sealing coating is 200-220 mu m.
5. The photo-curing nano anticorrosive material for desulfurization system according to claim 1, characterized in that: the epoxy sealing primer layer is formed by two times of coating, and the thickness of the epoxy sealing primer layer is 140-160 mu m.
6. The photo-curing nano anticorrosive material for desulfurization system according to claim 1, characterized in that: the nano composite daub layer is formed by smearing twice, and the thickness of the nano composite daub layer is 1500-1600 mu m.
7. The construction process of the photo-curing nano anticorrosive material for desulfurization system according to any one of claims 1 to 6, wherein: the construction method comprises a carbon steel base material lining construction process and a concrete lining construction process;
the construction process of the carbon steel substrate lining comprises the following steps:
step one, carbon steel base material treatment: comprehensively polishing a carbon steel substrate, removing welding slag, welding beading and splashes on a base surface, polishing and flattening the internal and external corners, welding seams, sharp edges of sharp corners, pipe joints and the like of equipment or performing circular arc smooth transition, and performing sand blasting and rust removal on Sa2.5 grade or St3 grade; cleaning and dust absorption are carried out on the base surface, and a thinner or a cleaner is recommended to be adopted for wiping once in a whole manner, so that residual oil stains and sand grains are removed; the surface of the treated product is clean and dry without dust, oil stain and other chemical media; the sand blasting rust removal, the cleaning dust removal and the first primary coat construction are finished within 1-8 hours so as to prevent the substrate from returning rust and repeated pollution;
step two, construction of a nano base coat: coating the nano composite emulsion on the primary coat twice, wherein the standard dosage of each step is 0.07kg/m2The nano composite emulsion base coat is prepared by adding a curing agent in 1.0-3.0 wt% of each nano composite emulsion base coat, wherein the thickness of the dried film is 60-80 μm;
step three, construction of a photocuring nano sheet layer: cutting the photocuring nano sheet according to the actual area size coated with the base coat, sticking the cut sheet sticking surface film with the base coat while uncovering, and uniformly applying force to ensure that the sheet is completely and tightly attached to the coating as much as possible, wherein the sheet cannot be directly trodden on the sheet during sticking so as to avoid damaging the sheet; and after the sheet is pasted, curing by adopting a lamp set, wherein the curing time of the single-layer sheet area is about 5-10min, and the curing time of the double-layer area is 15-20 min.
Construction of the lap joint of the photocuring nano sheet: when in lapping, the upper layer film is uncovered, the sheets are lapped together, the uncovered upper layer film is covered and pressed, the section arc of the lapping part is in smooth transition, the lapping length is not less than 50mm, and the lapping openings between adjacent sections are staggered to prevent the overlapping from being on the same straight line, so as to prevent multiple lapping;
step four, construction of the nano sealing coating: smearing a layer of nano sealing emulsion, wherein the standard dosage of the nano sealing emulsion is 0.35kg/m2, a curing agent is added into the nano sealing emulsion according to the weight percentage of 1.0-3.0 percent, the thickness of a dry film is 200-220 mu m, and the construction of the nano sealing coating can adopt brush coating, troweling or spraying;
the concrete lining construction process comprises the following steps:
step a, treating a concrete base material: comprehensively polishing, cleaning basal slag blocks, crusts, loose and convex parts until a firm and compact layer is achieved, and flattening the surface; polishing or repairing the internal and external corners, sharp edges of sharp corners, pipe joints and the like to form circular arc smooth transition; the base layer which is not dried completely locally needs to be dried, and air circulation is enhanced, so that the water content in the base layer with the depth of 20mm is not more than 6%; sealing the place with serious leakage by using a reinforcing leakage repairing agent; surface pretreatment such as flame baking and solvent wiping should be carried out on the polluted or corroded surface; if the base layer has the requirement of the infiltration crystallization waterproof treatment, the base material is treated in advance before the infiltration crystallization process; the surface of the treated product should be clean and dry, and free of dust, oil stain and other chemical media
B, epoxy sealing bottom coating construction: coating two epoxy sealing non-metal primers, wherein the standard dosage of each epoxy sealing non-metal primer is 0.15kg/m2, the component proportion of A, B is 2:1, the thickness of the epoxy sealing primer is 140-;
c, construction of the nano composite clay layer: coating two times of nano composite daub with the standard dosage of 1.3kg/m2The ratio of A to B to C is 20: 3.5-5: 30 by weight, the thickness is 1500-. .
8. The construction process of the photo-curing nano anticorrosive material for desulfurization system according to claim 7, wherein: in the construction of the nanometer base coat, the coating construction can adopt roller coating, brush coating, troweling or spraying, the time interval between the first coating construction and the second coating construction is 3 hours to 7 days, if the base material has pits, cracks, holes and areas which are difficult to polish to be smooth or have circular arc smooth transition during processing, the nanometer base coat can be repaired and leveled by using the nanometer composite emulsion base coat and quartz powder or putty prepared by blending modified resin and quartz powder, and the repaired part of the putty needs to be timely leveled by using a felt roller stained with a diluent before initial setting or the surface is polished to be smooth after the putty is cured.
9. The construction process of the photo-curing nano anticorrosive material for desulfurization system according to claim 7, wherein: in the construction of the light-cured nano sheet layer, the width of the raw material of the sheet is 1040mm, the length of the sheet is 8m or 10 m/roll, the sheet can be cut and cut at will and can also be combined in a lap joint mode, and the construction standard dosage of the light-cured nano sheet layer is as follows: conventional area 2.7kg/m2The thickness is 1.6-1.8 mm; high wear region 3.6kg/m2The thickness is 2.0-2.2 mm.
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