CN111036523A - Compound corrosion prevention process for desulfurizing tower - Google Patents
Compound corrosion prevention process for desulfurizing tower Download PDFInfo
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- CN111036523A CN111036523A CN201911164467.9A CN201911164467A CN111036523A CN 111036523 A CN111036523 A CN 111036523A CN 201911164467 A CN201911164467 A CN 201911164467A CN 111036523 A CN111036523 A CN 111036523A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/56—Three layers or more
- B05D7/58—No clear coat specified
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
- C09D183/08—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen, and oxygen
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2518/00—Other type of polymers
- B05D2518/10—Silicon-containing polymers
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- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
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- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention relates to the technical field of equipment anticorrosion processes, in particular to a desulfurization tower composite anticorrosion process, and aims to solve the technical problem that the service life of a desulfurization tower is influenced because the desulfurization tower is easy to crack and fall in the prior art. The technical key points comprise the following steps: (1) spraying a base layer: spraying NR-7LP fluorine-silicon anticorrosive resin, and thinly spraying the resin for 20 to 30 mu m; (2) spraying a fluorine-silicon anticorrosive layer after the base layer is sprayed for 20-30 minutes, so as to ensure no omission; (3) after the fluorine-silicon anticorrosive layer is slightly dried, spraying fluorine-silicon-based composite glass flake coating, wherein the thickness of the coating reaches 100-; (4) spraying the fluorosilicone-based composite glass flake coating again when the glass flake composite layer is cured for 2-24 hours or the surface of the glass flake composite layer is not sagging; (5) and after the spraying is finished for 4-24 hours, spraying and adding the graphite composite resin containing graphene. The surface of the anti-corrosion composite layer obtained by the anti-corrosion process is extremely firm, tough, smooth and wear-resistant, so that slurry is not easy to adhere, the service life is longer, and the service life can reach more than 10 years.
Description
Technical Field
The invention relates to the technical field of equipment anticorrosion processes, in particular to a desulfurization tower composite anticorrosion process.
Background
The desulfurization tower is tower equipment for performing desulfurization treatment on industrial waste gas. In a desulfurizing tower and a desulfurizing dust remover, SO in flue gas is treated2Carrying out chemical absorption, wherein in the absorption process, water or alkaline solution is required to be sprayed inside the desulfurizing tower to remove SO in the waste gas2The absorption is carried out, wherein a strong acid substance is inevitably generated, and the tower body is seriously corroded, so that the inside of the desulfurizing tower needs to be subjected to antiseptic treatment.
In order to solve the corrosion problem inside the desulfurizing tower, the tower body of the existing desulfurizing tower mostly adopts glass flake daub, although the glass flake daub can play a certain anti-corrosion role, most of the glass flake daub are epoxy and ethylene, and the glass flakes are easy to crack and fall off for a long time, so that the service life of the desulfurizing tower is influenced.
Disclosure of Invention
The invention aims to provide a composite anticorrosion process for a desulfurizing tower, which aims to solve the technical problems of cracking and falling off after the desulfurizing tower is corroded for a long time.
In order to realize the purpose of the invention, the following technical scheme is provided:
a composite anticorrosion process for a desulfurizing tower comprises the following steps:
(1) spraying a base layer: spraying NR-7LP fluorine-silicon anticorrosive resin, and thinly spraying the resin for 20 to 30 mu m;
(2) spraying a fluorine-silicon anticorrosive layer after the base layer is sprayed for 20-30 minutes, so as to ensure no omission;
(3) after the fluorine-silicon anticorrosive layer is slightly dried, spraying fluorine-silicon-based composite glass flake coating, wherein the thickness of the coating reaches 100-;
(4) spraying the fluorosilicone-based composite glass flake coating again when the glass flake composite layer is cured for 2-24 hours or the surface of the glass flake composite layer is not sagging;
(5) and after the fluorosilicone-based composite glass flake coating is finished for 4-24 hours, spraying and adding the graphene-containing graphite composite resin to ensure that no omission exists.
In the composite anticorrosion process for the desulfurizing tower, in the step (1), 0.5-5% of zinc phosphate is added into NR-7LP fluorine-silicon anticorrosion resin.
In the composite anticorrosion process for the desulfurizing tower, the spraying thickness of the fluorine-silicon anticorrosion layer in the step (2) is 40-50 μm.
In the above composite anticorrosion process for the desulfurization tower, the thickness of the fluorosilicone-based composite glass flake coating in the step (4) is 100-120 μm.
In the composite anticorrosion process for the desulfurizing tower, the size of the glass flakes in the coating in the step (3) is 100-200 meshes.
In the above composite corrosion prevention process for the desulfurization tower, in the step (5), the thickness of the graphite composite resin is 40-60 μm.
In the composite anticorrosion process for the desulfurizing tower, the fluorine-silicon-based composite glass flake coating is sprayed again in the step (4) for 2-10 hours.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the composite anticorrosion process for the desulfurizing tower, the time and the thickness are set in the manufacturing process, so that the composite materials of all layers can be enabled to perform chemical reaction with water molecules in the air in the presence of oxygen, and the performance and the effect which are comparable to those of ceramics can be achieved.
2. In the composite anticorrosion process for the desulfurizing tower, the base layer is sprayed by adopting NR-7LP fluorine-silicon anticorrosion resin, and 0.5-5% of zinc phosphate is added, so that the anticorrosion coating can permeate conveniently, bubbles are prevented from being generated, and the adhesive force is enhanced.
3. In the composite anticorrosion process of the desulfurizing tower, two layers of coatings containing glass flakes are adopted, and the coatings are fluorine-silicon-based composite resin. Different from epoxy and ethylene glass flakes, the glass flake has the advantages that no flammable solvent is added in the construction process, the glass flake has fire resistance at the temperature of 300 ℃, the process technology is simple, the spraying and rolling construction can be carried out, the construction time is short (1/3 is the anticorrosion construction time of other glass flakes), the glass flake has super-strong wear resistance and is resistant to corrosion of various acids, alkalis and salts, the glass flake has extremely high hardness and toughness, the glass flake is not easily damaged and cracked, the subsequent maintenance process is simple, and the cost is low.
4. In the composite anticorrosion process for the desulfurizing tower, the graphite composite resin containing the graphene is sprayed on the surface of the outermost layer, so that the surface of the inner wall of the desulfurizing tower is extremely firm, tough, smooth and wear-resistant, and slurry is not easy to adhere, so that the service life is longer and can reach more than 10 years.
Detailed Description
The technical solution of the present invention will be described in further detail with reference to the following embodiments, but the present invention is not limited thereto.
Example 1
(1) Spraying a base layer: adopting NR-7LP fluorine-silicon anticorrosive resin and adding 0.5% of zinc phosphate to spray the resin on a tower body, and thinly spraying the resin by 20 mu m;
(2) spraying a fluorine-silicon anticorrosive layer on the base layer after 20-30 minutes, and spraying the fluorine-silicon anticorrosive layer for 40 mu m to ensure no omission;
(3) spraying a composite coating of NR-7 and glass flakes with the size of 100 meshes (namely a fluorine-silicon-based composite glass flake coating) after the fluorine-silicon anticorrosive layer is slightly dried, wherein the thickness of the coating reaches 100 mu m;
(4) spraying fluorosilicone-based composite glass flake paint again for 2 hours on the glass flake composite layer, and spraying the paint to the thickness of 100 mu m;
(5) and after the fluorosilicone-based composite glass flake coating is finished for 4 hours, spraying and adding 40 micrometers of graphite composite resin containing 5% of graphene, and ensuring no omission.
Example 2
(1) Spraying a base layer: adopting NR-7LP fluorine-silicon anticorrosive resin and adding 1.5 percent of zinc phosphate to spray the resin on a tower body, and thinly spraying the resin by 30 mu m;
(2) spraying a fluorine-silicon anticorrosive layer on the base layer after 30 minutes, wherein the spraying is 50 mu m, so that omission is avoided;
(3) spraying a composite coating of NR-7 and 200-mesh glass flakes (namely a fluorine-silicon-based composite glass flake coating) after the fluorine-silicon anticorrosive layer is slightly dried, wherein the thickness of the coating reaches 120 mu m;
(4) after the glass flake composite layer is cured, spraying fluorine-silicon-based composite glass flake coating again, and spraying 100 mu m;
(5) and after the fluorosilicone-based composite glass flake coating is finished for 24 hours, spraying and adding 60 micrometers of graphite composite resin containing 5% of graphene, and ensuring no omission.
Example 3
(1) Spraying a base layer: adopting NR-7LP fluorine-silicon anticorrosive resin and adding 5% of zinc phosphate to spray the resin on a tower body, and thinly spraying the resin by 20-30 mu m;
(2) spraying a fluorine-silicon anticorrosive layer 25 minutes after spraying the base layer, wherein the spraying is 40-50 mu m, and no omission is ensured;
(3) spraying a composite coating of NR-7 and 200-mesh glass flakes (namely a fluorine-silicon-based composite glass flake coating) after the fluorine-silicon anticorrosive layer is slightly dried, wherein the thickness of the coating reaches 100-;
(4) spraying fluorine-silicon-based composite glass flake coating again after spraying the glass flakes for 10 hours, and spraying 100-;
(5) and after the fluorosilicone-based composite glass flake coating is finished for 20 hours, spraying and adding 40-60 mu m of graphite composite resin containing 5% of graphene, and ensuring no omission.
The composite anticorrosion process for the desulfurization towers in the embodiments 1 to 3 enables the composite material of each layer to react with water molecules in the air in the presence of oxygen, and the performance and effect comparable to those of ceramics can be achieved after curing. The surface of the inner wall of the sulfur tower is extremely firm, tough, smooth and wear-resistant, so that slurry is not easy to adhere, the service life is longer and can reach more than 10 years.
In addition, the composite anticorrosion process is also suitable for: the corrosion-resistant structure comprises various corrosion-resistant pipelines at the seabed, petroleum and natural gas pipelines, tank bodies, the inner and outer walls of large acid tanks of chemical enterprises, steel structures, the ground and the structure of dust removal water towers of power plants with the inner and outer walls of various metal tanks, the inner wall of an air preheater, a chimney, a sewage pool and the pool wall for storing corrosive liquid, and has the effects of better corrosion resistance and prolonging the service life.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (7)
1. The composite anticorrosion process for the desulfurizing tower is characterized by comprising the following steps of:
(1) spraying a base layer: spraying NR-7LP fluorine-silicon anticorrosive resin, and thinly spraying the resin for 20 to 30 mu m;
(2) spraying a fluorine-silicon anticorrosive layer after the base layer is sprayed for 20-30 minutes, so as to ensure no omission;
(3) after the fluorine-silicon anticorrosive layer is slightly dried, spraying fluorine-silicon-based composite glass flake coating, wherein the thickness of the coating reaches 100-;
(4) spraying the fluorosilicone-based composite glass flake coating again when the glass flake composite layer is cured for 2-24 hours or the surface of the glass flake composite layer is not sagging;
(5) and after the fluorosilicone-based composite glass flake coating is finished for 4-24 hours, spraying and adding the graphene-containing graphite composite resin to ensure that no omission exists.
2. The composite corrosion prevention process for the desulfurizing tower according to claim 1, wherein in the step (1), 0.5-5% of zinc phosphate is added into NR-7LP fluorine-silicon anticorrosive resin.
3. The desulfurization tower composite corrosion prevention process according to claim 1 or 2, wherein the spray thickness of the fluorosilicone corrosion prevention layer in the step (2) is 40-50 μm.
4. The composite corrosion prevention process for the desulfurization tower as recited in claim 3, wherein the thickness of the fluorosilicone-based composite glass flake coating in the step (4) is 100-120 μm.
5. The composite corrosion prevention process for the desulfurization tower as recited in claim 1, wherein the size of the glass flakes in the coating in the step (3) is 100-200 meshes.
6. The composite corrosion prevention process for the desulfurizing tower according to claim 1, wherein in the step (5), the thickness of the graphite composite resin is 40-60 μm.
7. The composite corrosion prevention process for the desulfurizing tower according to claim 1, wherein in the step (4), the fluorine-silicon-based composite glass flake coating is sprayed again within 2-10 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911164467.9A CN111036523A (en) | 2019-11-25 | 2019-11-25 | Compound corrosion prevention process for desulfurizing tower |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911164467.9A CN111036523A (en) | 2019-11-25 | 2019-11-25 | Compound corrosion prevention process for desulfurizing tower |
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| CN111036523A true CN111036523A (en) | 2020-04-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113025171A (en) * | 2021-03-18 | 2021-06-25 | 浙江嘉诚环保科技有限公司 | Fluorinated silicone glass flake anticorrosion structure and technology for sewage and chemical water tank |
-
2019
- 2019-11-25 CN CN201911164467.9A patent/CN111036523A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113025171A (en) * | 2021-03-18 | 2021-06-25 | 浙江嘉诚环保科技有限公司 | Fluorinated silicone glass flake anticorrosion structure and technology for sewage and chemical water tank |
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