CN111518497A - Anticorrosion adhesive for tube plate of seawater cooling condenser of power plant and use method thereof - Google Patents
Anticorrosion adhesive for tube plate of seawater cooling condenser of power plant and use method thereof Download PDFInfo
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- CN111518497A CN111518497A CN202010423023.9A CN202010423023A CN111518497A CN 111518497 A CN111518497 A CN 111518497A CN 202010423023 A CN202010423023 A CN 202010423023A CN 111518497 A CN111518497 A CN 111518497A
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- parts
- tube plate
- condenser
- power plant
- seawater cooling
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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
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
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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
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention discloses a power plant seawater cooling condenser tube plate anticorrosion adhesive and a use method thereof, wherein the power plant seawater cooling condenser tube plate anticorrosion adhesive is composed of the following components in parts by weight: 65-80 parts of anticorrosive main material, 6-10 parts of modifier, 2-3 parts of toughening agent and 5-6 parts of curing agent; the application method of the anti-corrosion adhesive comprises the steps of decontamination and drying, rough derusting of the tube plate, sand blasting derusting, coating of the anti-corrosion adhesive, maintenance and leakage detection. The anticorrosive adhesive has the effects of inhibiting corrosion, improving the anti-erosion capacity and the anti-stripping performance, increasing the chemical resistance and the strength, and promoting the curing and the adhesion of the expansion joint part of the pipe orifice; the service life of the condenser is prolonged, and the quality of condensed water of the unit and the safe and economic operation of the unit are guaranteed.
Description
Technical Field
The invention relates to the technical field of corrosion prevention of cooling condensers, in particular to a seawater cooling condenser tube plate corrosion prevention adhesive and a using method thereof.
Background
The condenser is the most important one of the steam turbine auxiliary equipment, and mainly functions to condense the steam discharged by the steam turbine by using circulating cooling water, so that the required vacuum is established and maintained at the steam turbine exhaust port, and pure condensed water is obtained to supply water to the boiler.
When the circulating water on the water side of the condenser adopts seawater, the content of chloride ions in the seawater is up to 20000mg/L, so that the water chamber, the tube plate and the like of the condenser can be seriously corroded, and particularly, the contact part between the tube plate of the condenser and a copper tube or a stainless steel tube is seriously corroded. Due to the difference of corrosion potentials of steel materials, copper or stainless steel, the dissimilar metal galvanic corrosion is easy to generate in the strong corrosion environment of seawater; secondly, the kneck of condenser tube sheet and heat exchange tube generally adopts the expanded joint mode, has the condition of overexpansion and underexpansion easily, especially when the unit opens and stops or the load frequently changes, the expend with heat and contract with cold of heat exchange tube can cause the heat exchange tube thickness attenuate of expanded joint department, takes place to become flexible, and then arouses the seepage, causes a large amount of sea water seepage to enter the vapour side of condenser, not only influences the vapour side vacuum of condenser, still greatly reduced soda quality, make the rapid scale deposit of thermodynamic system, seriously threaten unit safety and economy and move.
With the operation of high-parameter and high-capacity generator sets, the requirements on the quality of water vapor are more and more strict, so that the technology for anticorrosion and adhesion treatment of condenser tube plates is widely promoted.
The epoxy resin coating in the traditional anticorrosion construction of the condenser tube plate has the advantages of acid and alkali resistance, firm binding force, long effective time, low price and the like, and is widely applied. However, seawater corrodes the tube plate of the cooling condenser seriously, the toughness of the epoxy resin is poor, and particularly at the joint of the heat exchange tube and the tube plate, due to the effects of thermal expansion and cold contraction and stress, the brittle epoxy resin coating falls off or bubbles, so that the coating fails. According to statistics, due to the fact that the traditional coating is improper in variety selection or the quality of the traditional coating, the coating can bubble and fall off within 2 years of use, so that an anticorrosion coating system fails, and the failure accidents of the coating account for 50% -60% of corrosion accidents.
Disclosure of Invention
The invention aims to solve the technical problem of providing an anticorrosion adhesive for a tube plate of a seawater cooling condenser of a power plant, and aims to solve the problems that the traditional adhesive is not good in toughness and is easy to fall off or bubble to cause corrosion accidents, so that the wear resistance and the erosion resistance of the tube plate of the seawater cooling condenser are improved.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows.
An anticorrosion adhesive for a tube plate of a seawater cooling condenser of a power plant comprises the following components in parts by weight: 65-80 parts of anticorrosive main material, 6-10 parts of modifier, 2-3 parts of toughening agent and 5-6 parts of curing agent.
Further, the anticorrosive main material comprises 45-55 parts of diphenol propane epoxy resin and 20-25 parts of polysulfide rubber.
Further, the modifier comprises 3-5 parts of polyvinyl butyral and 3-5 parts of urea-formaldehyde melamine resin.
Further, the toughening agent is dioctyl phthalate.
Further, the curing agent is 2-methylimidazole.
Further, the anticorrosion adhesive for the tube plate of the seawater cooling condenser of the power plant comprises the following components in parts by weight: 65-70 parts of anticorrosive main material, 6-8 parts of modifier, 2-2.5 parts of toughening agent and 5.5-6 parts of curing agent.
The invention also provides a use method of the anticorrosion adhesive for the tube plates of the seawater cooling condenser of the power plant, which specifically comprises the following steps:
s1, decontamination and drying: blowing dirt on the condenser by using compressed air, and continuously ventilating to keep the dirt dry;
s2, roughly derusting the tube plate: removing a corrosion rust layer of the condenser by using a small shovel, and blowing the surface clean;
s3, sand blasting and rust removing: further performing sand blasting and rust removal on the condenser treated in the step S2, and purging the surface;
s4: coating an anticorrosive adhesive: uniformly brushing three layers of anticorrosive adhesives on the surface of the condenser and the pipe orifice;
s5, maintenance and leakage detection: and (4) ventilating and maintaining the coating coated by the S4 at normal temperature for 4 days, and then filling water to the steam side of the condenser for leakage detection and blockage detection.
Due to the adoption of the technical scheme, the technical progress of the invention is as follows.
The anticorrosion adhesive for the tube plate of the seawater cooling condenser in the power plant not only has the effects of inhibiting corrosion, improving the anti-erosion capability and the anti-stripping performance of the tube plate and increasing the chemical resistance and the strength of the tube plate, but also has the effects of promoting the solidification and adhesion of the expanded joint part of the tube opening. The anti-corrosion adhesive also has the advantages of simple use method, quick effect, economy and relative reliability, can effectively reduce the occurrence of leakage accidents of the tube plate expansion port, improve the sealing performance of the tube plate and the copper tube expansion port, prolong the service life of the condenser, and ensure the quality of condensed water of a unit and the safe and economic operation of the unit.
Detailed Description
An anticorrosion adhesive for tube plates of a seawater cooling condenser of a power plant comprises, by weight, 65-80 parts of an anticorrosion main material, 6-10 parts of a modifier, 2-3 parts of a toughening agent and 5-6 parts of a curing agent;
wherein: the anticorrosive main material comprises 45-55 parts of diphenol propane epoxy resin and 20-25 parts of polysulfide rubber, the modifier comprises 3-5 parts of polyvinyl butyral and 3-5 parts of urea-formaldehyde melamine resin, the toughening agent is dioctyl phthalate, and the curing agent is 2-methylimidazole.
The main operation steps of the anti-corrosion adhesive when being applied to the tube plate of the seawater cooling condenser comprise the steps of decontamination and drying, rough rust removal of the tube plate, sand blasting and rust removal, coating of the anti-corrosion adhesive, maintenance and leakage detection, and the specific operation mode is as follows:
s1, decontamination and drying: the outlet end plate and the inlet end plate of the condenser are disassembled firstly, water is filled in the condenser to check whether water leakage and blockage exist, each stainless steel pipe, pipe plate and water chamber of the condenser are purged by compressed air, so that sludge and sundries do not exist in the pipe orifice, and continuous ventilation is carried out to ensure that the copper pipe, the pipe plate and the water chamber are in a dry state.
S2, roughly derusting the tube plate: and (3) removing the corrosion rust layer at the dead corners of the tube plate and the water chamber by using a small shovel under the condition of ensuring that the stainless steel tube is not damaged. And (4) descaling and derusting the water chamber, the tube plates and the pipe orifices of all the stainless steel tubes, and repeatedly brushing and sweeping the scale and rust in the pipe orifices by using soft copper wire brushes until the metal matrix is exposed, wherein the derusting depth is about 150 mm. After rust removal, the surface of the rust removal is cleaned by dry and clean compressed air, and abrasive dust adhered to the surface is swept and cleaned.
S3, sand blasting and rust removing: the special plug for the stainless steel pipe is covered, protective measures are taken for the stainless steel pipe, sand blasting and rust removing are carried out on the inner wall of the tube plate of the condenser, all impurities are removed, the metal matrix is exposed, and the requirement of the national standard GB89232.5 level is met. And then compressed air is used for fully sweeping dust in the tube plate, the water chamber and each stainless steel tube.
S4, brushing an anticorrosive adhesive: then, an anticorrosive adhesive is uniformly coated on the pipe orifice of each stainless steel pipe and the metal surface of the condenser, a layer of anticorrosive adhesive is coated immediately after drying and solidification, the interval time from sand blasting to finishing of spraying construction is shortened as much as possible, spraying is started before a fresh surface is oxidized, 3 layers are coated in total, the adhesive layer is ensured to be uniform and flat, and the sagging and falling phenomena are avoided. The thickness of the glue layer of the water chamber and the tube plate is about 0.4-0.5 mm, the thickness of the glue layer in the tube opening is about 0.20-0.30 mm, the cleaning of the glue ball in operation is not influenced, and the glue coating depth is 150 mm.
S5, maintenance and leakage detection: and (4) after the coating coated by the S4 is subjected to normal-temperature ventilation drying maintenance for 4 days, watering the steam side of the condenser, and after the conditions of no water leakage and blockage are checked, reinstalling the end cover of the condenser to finish the work of the anticorrosive coating of the condenser.
The present invention will be described in further detail with reference to specific examples.
Example 1
An anticorrosion adhesive for a tube plate of a seawater cooling condenser of a power plant comprises the following components in parts by weight: 45 parts of diphenol propane epoxy resin, 25 parts of polysulfide rubber, 3 parts of polyvinyl butyral, 3 parts of urea-formaldehyde melamine resin, 2 parts of dioctyl phthalate and 5 parts of 2-methylimidazole.
The specific application method of the anticorrosion adhesive for the tube plate of the seawater cooling condenser of the power plant comprises the following steps:
s1, decontamination and drying: the outlet end plate and the inlet end plate of the condenser are disassembled firstly, water is filled in the condenser to check whether water leakage and blockage exist, each stainless steel pipe, pipe plate and water chamber of the condenser are purged by compressed air, so that sludge and sundries do not exist in the pipe orifice, and continuous ventilation is carried out to ensure that the copper pipe, the pipe plate and the water chamber are in a dry state.
S2, roughly derusting the tube plate: and (3) removing the corrosion rust layer at the dead corners of the tube plate and the water chamber by using a small shovel under the condition of ensuring that the stainless steel tube is not damaged. And (4) descaling and derusting the water chamber, the tube plates and the pipe orifices of all the stainless steel tubes, and repeatedly brushing and sweeping the scale and rust in the pipe orifices by using soft copper wire brushes until the metal matrix is exposed, wherein the derusting depth is about 150 mm. After rust removal, the surface of the rust removal is cleaned by dry and clean compressed air, and abrasive dust adhered to the surface is swept and cleaned.
S3, sand blasting and rust removing: the special plug for the stainless steel pipe is covered, protective measures are taken for the stainless steel pipe, sand blasting and rust removing are carried out on the inner wall of the tube plate of the condenser, all impurities are removed, the metal matrix is exposed, and the requirement of the national standard GB89232.5 level is met. And then compressed air is used for fully sweeping dust in the tube plate, the water chamber and each stainless steel tube.
S4, brushing an anticorrosive adhesive: then, an anticorrosive adhesive is uniformly coated on the pipe orifice of each stainless steel pipe and the metal surface of the condenser, a layer of anticorrosive adhesive is coated immediately after drying and solidification, the interval time from sand blasting to finishing of spraying construction is shortened as much as possible, spraying is started before a fresh surface is oxidized, 3 layers are coated in total, the adhesive layer is ensured to be uniform and flat, and the sagging and falling phenomena are avoided. The thickness of the glue layer of the water chamber and the tube plate is about 0.4-0.5 mm, the thickness of the glue layer in the tube opening is about 0.20-0.30 mm, the cleaning of the glue ball in operation is not influenced, and the glue coating depth is 150 mm.
S5, maintenance and leakage detection: and (4) after the coating coated by the S4 is subjected to normal-temperature ventilation drying maintenance for 4 days, watering the steam side of the condenser, and after the conditions of no water leakage and blockage are checked, reinstalling the end cover of the condenser to finish the work of the anticorrosive coating of the condenser.
Examples 2 to 5:
examples 2 to 5 were the same as example 1 except that the components and the contents of the compounds used in the anticorrosive binder were different. The compound components and contents of the anticorrosion adhesive for the tube plates of the seawater cooling condenser of the power plant in the examples 2 to 5 are shown in the following table:
| component name | Example 2 | Example 3 | Example 4 | Example 5 |
| Diphenolpropane epoxy resin | 47 | 50 | 52 | 55 |
| Polysulfide rubber | 21 | 23 | 24 | 22 |
| Polyvinyl butyral | 4.5 | 4 | 5 | 3.5 |
| Urea-formaldehyde melamine resin | 4 | 3.5 | 4.5 | 5 |
| Dioctyl phthalate | 2.5 | 2 | 3 | 3.5 |
| 2-methylimidazole | 5.3 | 5.5 | 5.6 | 6 |
After GB/T9274-1986 test tests are respectively carried out on the anticorrosion adhesives prepared in the embodiments 1-5, the results show that the anticorrosion adhesives prepared in the embodiments 1-5 have no foaming, cracking, shedding and discoloration phenomena, and the anticorrosion adhesives prepared in the invention have good stripping resistance, chemical resistance and corrosion inhibition performance. After GB/T1732-1993 test is carried out on the anticorrosive adhesives prepared in the examples 1-5 respectively, the test results show that: the corrosion resistance of the corrosion resistant adhesives prepared in examples 1-5 were all relatively high.
Claims (7)
1. The anticorrosion adhesive for the tube plate of the seawater cooling condenser of the power plant is characterized by comprising the following components in parts by weight: 65-80 parts of anticorrosive main material, 6-10 parts of modifier, 2-3 parts of toughening agent and 5-6 parts of curing agent.
2. The power plant seawater cooling condenser tube plate anticorrosion adhesive agent as claimed in claim 1, wherein: the anticorrosive main material comprises 45-55 parts of diphenol propane epoxy resin and 20-25 parts of polysulfide rubber.
3. The power plant seawater cooling condenser tube plate anticorrosion adhesive agent as claimed in claim 1, wherein: the modifier comprises 3-5 parts of polyvinyl butyral and 3-5 parts of urea-formaldehyde melamine resin.
4. The power plant seawater cooling condenser tube plate anticorrosion adhesive agent as claimed in claim 1, wherein: the toughening agent is dioctyl phthalate.
5. The power plant seawater cooling condenser tube plate anticorrosion adhesive agent as claimed in claim 1, wherein: the curing agent is 2-methylimidazole.
6. The anticorrosion adhesive for the tube plate of the seawater cooling condenser of the power plant is characterized by comprising the following components in parts by weight: 65-70 parts of anticorrosive main material, 6-8 parts of modifier, 2-2.5 parts of toughening agent and 5.5-6 parts of curing agent.
7. The use method of the anticorrosion adhesive for the tube plates of the seawater cooling condenser for the power plant as claimed in claims 1 to 6 is characterized by comprising the following steps:
s1, decontamination and drying: blowing dirt on the condenser by using compressed air, and continuously ventilating to keep the dirt dry;
s2, roughly derusting the tube plate: removing a corrosion rust layer of the condenser by using a small shovel, and blowing the surface clean;
s3, sand blasting and rust removing: further performing sand blasting and rust removal on the condenser treated in the step S2, and purging the surface;
s4: coating an anticorrosive adhesive: uniformly brushing three layers of anticorrosive adhesives on the surface of the condenser and the pipe orifice;
s5, maintenance and leakage detection: and (4) ventilating and maintaining the coating coated by the S4 at normal temperature for 4 days, and then filling water to the steam side of the condenser for leakage detection and blockage detection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010423023.9A CN111518497A (en) | 2020-05-19 | 2020-05-19 | Anticorrosion adhesive for tube plate of seawater cooling condenser of power plant and use method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010423023.9A CN111518497A (en) | 2020-05-19 | 2020-05-19 | Anticorrosion adhesive for tube plate of seawater cooling condenser of power plant and use method thereof |
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| CN111518497A true CN111518497A (en) | 2020-08-11 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85103496A (en) * | 1985-03-21 | 1986-11-19 | 晋华水力磨蚀技术开发研究中心 | The powder adhesive of Polyurethane and metal and construction technology thereof |
| JPH09263745A (en) * | 1996-03-29 | 1997-10-07 | Sumitomo Kinzoku Electro Device:Kk | Adhesive epoxy resin composition for sealing |
| CN1824717A (en) * | 2005-02-25 | 2006-08-30 | 赵东楼 | Anti corrosion paint for condenser |
| CN105238206A (en) * | 2015-09-29 | 2016-01-13 | 国家电网公司 | Metal corrosion resistant agent and metal anticorrosion treatment method |
| CN108559382A (en) * | 2018-05-22 | 2018-09-21 | 海南大学 | Polysulfide rubber modified anticorrosive sewage-preventing epoxy resin paint, preparation method and system |
-
2020
- 2020-05-19 CN CN202010423023.9A patent/CN111518497A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85103496A (en) * | 1985-03-21 | 1986-11-19 | 晋华水力磨蚀技术开发研究中心 | The powder adhesive of Polyurethane and metal and construction technology thereof |
| JPH09263745A (en) * | 1996-03-29 | 1997-10-07 | Sumitomo Kinzoku Electro Device:Kk | Adhesive epoxy resin composition for sealing |
| CN1824717A (en) * | 2005-02-25 | 2006-08-30 | 赵东楼 | Anti corrosion paint for condenser |
| CN105238206A (en) * | 2015-09-29 | 2016-01-13 | 国家电网公司 | Metal corrosion resistant agent and metal anticorrosion treatment method |
| CN108559382A (en) * | 2018-05-22 | 2018-09-21 | 海南大学 | Polysulfide rubber modified anticorrosive sewage-preventing epoxy resin paint, preparation method and system |
Non-Patent Citations (1)
| Title |
|---|
| 李文彬等: "《精细化工生产技术》", 31 January 2014, 中央广播电视大学出版社 * |
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Address after: 050000 2nd floor, Yingpan commercial and residential building, 129 Nanxiao street, Qiaoxi District, Shijiazhuang City, Hebei Province Applicant after: Hebei Jiantou energy science and Technology Research Institute Co.,Ltd. Address before: 050000 2nd floor, Yingpan commercial and residential building, 129 Nanxiao street, Qiaoxi District, Shijiazhuang City, Hebei Province Applicant before: HEBEI JI-YAN ENERGY SCIENCE AND TECHNOLOGY RESEARCH INSTITUTE Co.,Ltd. |
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Application publication date: 20200811 |
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