阅读说明：本技术 一种地面燃气管道防腐工艺 (Ground gas pipeline anticorrosion technology ) 是由 张喆 季洪成 吕建桥 于 2021-08-26 设计创作，主要内容包括：本发明涉及管道防腐技术领域,具体涉及一种地面燃气管道防腐工艺；包括以下步骤：S1、对燃气管道进行预处理,S2、在预处理的燃气管道上喷涂防腐涂层,S3、在防腐涂层上均匀涂抹热熔胶；本发明在燃气管道的表面喷涂双层防腐漆,能够提升对然气管道的防腐效,通过聚乙烯醋酸乙烯酯接枝马来酸酐单体作为基础聚合物制备热熔胶,使得热熔胶具有防腐作用,提升了对燃气管道的防腐效果,改变了传统的采用液化气喷枪加热的方式,使得对地面燃气管道防腐施工过程中无明火,上手较快,施工完成后成品美观,提升了安全性,由防腐涂层、热熔胶和热收缩套管形成多层防腐,能够有效的提升对燃气管道的防腐效果。(The invention relates to the technical field of pipeline corrosion prevention, in particular to a surface gas pipeline corrosion prevention process; the method comprises the following steps: s1, preprocessing the fuel gas pipeline, S2, spraying an anticorrosive coating on the preprocessed fuel gas pipeline, and S3, uniformly coating hot melt adhesive on the anticorrosive coating; the double-layer anticorrosive paint is sprayed on the surface of the gas pipeline, so that the anticorrosive effect on the gas pipeline can be improved, the hot melt adhesive is prepared by taking the polyvinyl acetate grafted maleic anhydride monomer as a basic polymer, the hot melt adhesive has an anticorrosive effect, the anticorrosive effect on the gas pipeline is improved, the traditional mode of heating by adopting a liquefied gas spray gun is changed, open fire is avoided in the anticorrosive construction process of the ground gas pipeline, the operation is fast, the finished product is attractive after the construction is finished, the safety is improved, the multilayer anticorrosion is formed by the anticorrosive coating, the hot melt adhesive and the heat shrinkage sleeve, and the anticorrosive effect on the gas pipeline can be effectively improved.)

1. An anticorrosion process for a ground gas pipeline is characterized by comprising the following steps:

s1, preprocessing a gas pipeline;

s2, spraying an anticorrosive coating on the pretreated gas pipeline;

s3, uniformly smearing hot melt adhesive on the anticorrosive coating;

and S4, sleeving the thermal shrinkage sleeve on the gas pipeline, and heating the gas pipeline to finish the corrosion prevention of the gas pipeline.

2. The corrosion prevention process for the ground gas pipeline as claimed in claim 1, wherein in the step S1, the gas pipeline is pretreated, comprising the following steps:

s101, removing rust on the surface of the gas pipeline by using quartz sand;

s102, wiping off oil stains and sandy soil on the surface of the gas pipeline by using cotton cloth;

s103, heating the surface of the natural gas pipeline by using a flame accelerator, and removing moisture on the surface of the natural gas pipeline.

3. The surface gas pipeline corrosion prevention process as claimed in claim 2, wherein in the step S103, the surface of the gas pipeline is heated at a temperature of 30-40 ℃.

4. The process of claim 1, wherein in the step S2, the step of spraying the anticorrosion coating on the pretreated gas pipeline comprises the steps of:

s201, spraying a first layer of anticorrosive paint on the surface of the gas pipeline by using a spray gun;

s202, after the first layer of antirust paint is solidified, spraying a second layer of anticorrosive paint on the surface of the gas pipeline by using the spray gun again to form an anticorrosive coating.

5. The anticorrosion process for the ground gas pipeline as claimed in claim 1, wherein in the step S3, the preparation method of the hot melt adhesive comprises:

placing the polyethylene vinyl acetate in a stirrer; heating to dissolve the polyethylene vinyl acetate, and adding a maleic anhydride monomer; when the temperature rises to 120-135 ℃, adding the xylene solution, reacting for 2 hours at constant temperature, stopping heating, and naturally cooling; when the temperature is reduced to 70-80 ℃, adding an ethanol precipitator, stirring, cooling to room temperature, and filtering under reduced pressure; washing the fine fraction with detergent for 2 times; and filtering to obtain the hot melt adhesive.

6. The process for preventing corrosion of a ground gas pipeline according to claim 5, wherein the detergent is acetone.

7. The surface gas pipeline corrosion prevention process of claim 1, wherein in the step S4, a heat shrinkage sleeve is heated by a heat gun.

8. The process of claim 1, wherein in step S4, the distance from the air outlet of the heat gun to the heat shrinkable sleeve is 10 cm.

9. The process for corrosion protection of a ground gas pipeline according to claim 1, wherein in the step S4, the heating temperature of the hot blast is 650 ℃.

10. The process of claim 1, wherein in step S4, after the operation is completed, the power supply of the heat gun is turned off after the heat gun is cooled to room temperature.

Technical Field

The invention relates to the technical field of pipeline corrosion prevention, in particular to a surface gas pipeline corrosion prevention process.

Background

The gas pipeline is a special pipeline for conveying combustible gas. With the improvement of environmental protection requirements, natural gas is increasingly applied to thousands of households as clean energy. The more widespread the use of natural gas, the more and more natural gas transportation pipelines are required. Avoid taking place the condition of corroding natural gas transportation pipeline, can effectual improvement natural gas transportation pipeline's life, can avoid the danger of natural gas leakage simultaneously, consequently need carry on anticorrosive to gas pipeline.

The patent document CN111718624A discloses a harmless pipeline corrosion prevention method, which has a certain corrosion prevention effect, but the corrosion prevention effect is not good, and the safety is not good, so that the use requirements of users cannot be met.

In conclusion, the development of a surface gas pipeline anticorrosion process remains a key problem to be solved urgently in the technical field of pipeline anticorrosion.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a process for preventing corrosion of a ground gas pipeline, which comprises the steps of removing rust on the surface of the gas pipeline, removing oil stain, sandy soil and water, easily spraying an anti-corrosion coating, improving the anti-corrosion effect of the anti-corrosion coating, spraying a double-layer anti-corrosion paint on the surface of the gas pipeline, improving the anti-corrosion effect on the gas pipeline, avoiding water in the air and the like to cause corrosion of the gas pipeline, preparing a hot melt adhesive by grafting a maleic anhydride monomer with polyvinyl acetate as a basic polymer, enabling the hot melt adhesive to have an anti-corrosion effect, improving the anti-corrosion effect on the gas pipeline, changing the traditional mode of heating by using a liquefied gas spray gun, enabling the ground gas pipeline to be free of open fire in the anti-corrosion construction process, fast in operation, attractive finished products after construction, and improving safety, wherein the anti-corrosion coating is used, The hot melt adhesive and the heat shrinkable sleeve form a multilayer anticorrosion structure, so that the anticorrosion effect on the gas pipeline can be effectively improved.

In order to achieve the purpose, the invention provides the following technical scheme:

an anticorrosion process for a ground gas pipeline comprises the following steps:

and S1, preprocessing the gas pipeline.

And S2, spraying an anticorrosive coating on the pretreated fuel gas pipeline.

And S3, uniformly coating hot melt adhesive on the anticorrosive coating.

And S4, sleeving the thermal shrinkage sleeve on the gas pipeline, and heating the gas pipeline to finish the corrosion prevention of the gas pipeline.

By adopting the technical scheme: the invention carries out pretreatment on the fuel gas pipeline, sprays the anticorrosion coating, and sprays the double-layer anticorrosion paint on the pretreated fuel gas pipeline to form the anticorrosion coating, thereby being capable of improving the anticorrosion effect on the fuel gas pipeline.

The invention is further configured to: in step S1, the method for preprocessing the gas pipeline includes the following steps:

s101, removing rust on the surface of the gas pipeline by using quartz sand.

And S102, wiping off oil stains and sandy soil on the surface of the gas pipeline by using cotton cloth.

S103, heating the surface of the natural gas pipeline by using a flame accelerator, and removing moisture on the surface of the natural gas pipeline.

By adopting the technical scheme: the invention can remove impurities, oil stains, sandy soil and water on the surface of the gas pipeline, can be easily and tightly connected with the gas pipeline by the anticorrosive paint, and can improve the adhesion capability of the anticorrosive coating.

The invention is further configured to: in the step S103, the surface of the natural gas pipeline is heated under the condition that the temperature is 30-40 ℃.

By adopting the technical scheme: the surface of the gas pipeline is heated at the temperature of 30-40 ℃, so that the water on the gas pipeline can be effectively removed, and the spraying of the anticorrosive coating is prevented from being influenced by the water.

The invention is further configured to: in the step S2, spraying an anticorrosive coating on the pretreated gas pipeline includes the following steps:

s201, spraying a first layer of anticorrosive paint on the surface of the gas pipeline by using a spray gun.

S202, after the first layer of antirust paint is solidified, spraying a second layer of anticorrosive paint on the surface of the gas pipeline by using the spray gun again to form an anticorrosive coating.

By adopting the technical scheme: the spray gun is adopted to spray the double-layer anticorrosive paint, so that the corrosion of the gas pipeline caused by water in the air is avoided, and the anticorrosive coating is formed by the double-layer anticorrosive paint, so that the anticorrosive effect on the gas pipeline is realized.

The invention is further configured to: in step S3, the preparation method of the hot melt adhesive is:

placing the polyethylene vinyl acetate in a stirrer; heating to dissolve the polyethylene vinyl acetate, and adding a maleic anhydride monomer; when the temperature rises to 120-135 ℃, adding the xylene solution, reacting for 2 hours at constant temperature, stopping heating, and naturally cooling; when the temperature is reduced to 70-80 ℃, adding an ethanol precipitator, stirring, cooling to room temperature, and filtering under reduced pressure; washing the fine fraction with detergent for 2 times; and filtering to obtain the hot melt adhesive.

By adopting the technical scheme: the polyethylene vinyl acetate grafted maleic anhydride monomer is used as a base polymer to prepare the hot melt adhesive, so that the cohesiveness of the hot melt adhesive is enhanced, meanwhile, the modified maleic anhydride introduces a polar group, so that the hot melt adhesive has certain crystallization capacity, the movement of a molecular chain is blocked due to the association of hydrogen bonds, the thermal property is improved, and the hot melt adhesive has an anti-corrosion effect.

The invention is further configured to: the detergent is acetone.

By adopting the technical scheme: the invention takes acetone as a detergent, and the maleic anhydride monomer can be dissolved in the acetone, thereby realizing the function of removing the unreacted maleic anhydride monomer.

The invention is further configured to: in step S4, the heat shrinkable sleeve is heated by a heat gun.

By adopting the technical scheme: the invention changes the traditional heating mode by adopting a liquefied gas spray gun, so that open fire is avoided in the process of anticorrosion construction of the ground gas pipeline, the operation is fast, and the finished product is beautiful after the construction is finished.

The invention is further configured to: in step S4, the distance from the air outlet of the heat gun to the heat-shrinkable sleeve is 10cm during heating.

By adopting the technical scheme: the invention enables the hot air gun to heat the heat shrinkable sleeve, so that the heat shrinkable sleeve is fixed on the gas pipeline, thereby realizing the anticorrosion effect.

The invention is further configured to: in step S4, the heating temperature of the hot air gun is 650 ℃.

By adopting the technical scheme: the invention enables the heat gun to provide proper temperature, so that the heat shrinkable sleeve can be shrunk and fixed on the gas pipeline.

The invention is further configured to: in step S4, after the operation is completed, the power supply of the heat gun is turned off after the heat gun is cooled to room temperature.

By adopting the technical scheme: the invention improves the safety in the process of using the air heater.

Advantageous effects

Compared with the known public technology, the technical scheme provided by the invention has the following beneficial effects:

the invention removes rust on the surface of the gas pipeline, removes impurities on the surface of the gas pipeline, removes oil stain, sand and water, can easily spray an anticorrosive coating, avoids the anticorrosive coating from being separated from the gas pipeline, improves the anticorrosive effect of the anticorrosive coating, can improve the anticorrosive effect of the gas pipeline by spraying double-layer anticorrosive paint on the surface of the gas pipeline, ensures that the formed anticorrosive coating can prolong the service life of the gas pipeline, avoids water in the air and the like to cause corrosion of the gas pipeline, prepares the hot melt adhesive by using the polyethylene vinyl acetate grafted maleic anhydride monomer as a base polymer, enhances the caking property of the hot melt adhesive, simultaneously, leads in polar group after maleic anhydride is modified, ensures that the hot melt adhesive has certain crystallization capability, blocks the movement of molecular chains due to hydrogen bond association, improves the thermal property, and ensures that the hot melt adhesive has the anticorrosive effect, the anti-corrosion effect of the gas pipeline is improved, the traditional mode of heating by adopting a liquefied gas spray gun is changed, open fire does not exist in the anti-corrosion construction process of the ground gas pipeline, the operation is quick, the finished product is attractive after the construction is finished, the safety is improved, the multilayer anti-corrosion is formed by the anti-corrosion coating, the hot melt adhesive and the heat shrinkage sleeve, and the anti-corrosion effect of the gas pipeline can be effectively improved.

Drawings

FIG. 1 is a flow chart of a corrosion prevention process for a ground gas pipeline.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The present invention will be further described with reference to the following examples.

Example 1

Referring to fig. 1, fig. 1 is a flow chart of a corrosion prevention process for a ground gas pipeline, which includes the following steps:

step one, preprocessing a gas pipeline.

The method for pretreating the fuel gas pipeline comprises the following steps:

101) and derusting the surface of the gas pipeline by using quartz sand.

102) And wiping off oil stains and sandy soil on the surface of the gas pipeline by using cotton cloth.

103) And heating the surface of the natural gas pipeline by using a flame accelerator to remove moisture on the surface of the natural gas pipeline.

The surface of the natural gas pipeline is heated under the condition that the temperature is 30 ℃.

The surface of the natural gas pipeline is subjected to rust removal in the step, manual or mechanical rust removal can be adopted, selection is carried out according to use requirements, impurities on the surface of the natural gas pipeline can be removed through the rust removal, oil stains, sand and water are removed, the anti-corrosion coating can be easily sprayed, the anti-corrosion coating is prevented from being separated from the natural gas pipeline, and the anti-corrosion effect of the anti-corrosion coating is improved.

And step two, spraying an anticorrosive coating on the pretreated gas pipeline.

Spraying an anticorrosive coating on the pretreated gas pipeline, comprising the following steps of:

201) and spraying a first layer of anticorrosive paint on the surface of the gas pipeline by using a spray gun.

202) And after the first layer of antirust paint is solidified, spraying a second layer of anticorrosive paint on the surface of the gas pipeline by using the spray gun again to form an anticorrosive coating.

The step can improve the corrosion prevention effect of the gas pipeline by spraying the double-layer anticorrosive paint, so that the formed anticorrosive coating can prolong the service life of the gas pipeline, and the gas pipeline is prevented from being corroded by water and the like in the air.

And step three, uniformly coating the hot melt adhesive on the anticorrosive coating.

The preparation method of the hot melt adhesive comprises the following steps:

placing the polyethylene vinyl acetate in a stirrer; heating to dissolve the polyethylene vinyl acetate, and adding a maleic anhydride monomer; when the temperature is raised to 120 ℃, adding the xylene solution, reacting for 2 hours at constant temperature, stopping heating, and naturally cooling; when the temperature is reduced to 70 ℃, adding an ethanol precipitator, stirring, cooling to room temperature, and filtering under reduced pressure; washing the fine fraction with detergent for 2 times; and filtering to obtain the hot melt adhesive.

The detergent is acetone.

According to the step, the hot melt adhesive is prepared by preparing the hot melt adhesive and taking the polyethylene vinyl acetate grafted maleic anhydride monomer as a basic polymer, so that the cohesiveness of the hot melt adhesive is enhanced, meanwhile, the polar group is introduced after the maleic anhydride is modified, so that the hot melt adhesive has certain crystallization capacity, the movement of a molecular chain is blocked due to the association of hydrogen bonds, the thermal performance is improved, the hot melt adhesive has an anti-corrosion effect, and the anti-corrosion effect on a gas pipeline is further improved.

And step four, sleeving the heat shrinkable sleeve on the gas pipeline, and heating the gas pipeline to finish the corrosion prevention of the gas pipeline.

And heating the heat shrinkable sleeve by using a hot air gun.

When heating, the distance between the air supply outlet of the hot air gun and the heat shrinkage sleeve is 10 cm.

The heating temperature of the hot air gun is 650 ℃.

After the operation is finished, the power supply of the hot air gun is closed when the hot air gun is cooled to the room temperature.

This step has changed the traditional mode that adopts the liquefied gas spray gun heating for to ground gas pipeline anticorrosive work progress in not having naked light, the first hand is very fast, and the finished product is pleasing to the eye after the construction is accomplished, and the full load power of use of hot-blast rifle of adoption is 2000W, and the job site easily satisfies the power supply and satisfies, facilitates the use, and the use of hot-blast rifle is: the power supply is connected, the power switch is turned to the I gear, the motor runs, the temperature control switch is turned to the maximum when wind blows out, and if hot wind is sent out, the normal work of the hot air gun is indicated; when heating, the working temperature of the hot air gun is set to 650 ℃, the distance between the air supply outlet of the hot air gun and the heat shrinkable sleeve is 10cm, then the hot air gun is uniformly heated towards the heat shrinkable sleeve until the heat shrinkable sleeve is shrunk to a state required by the production process, then the hot air gun is moved away to finish the operation, the temperature control switch is adjusted to a minimum state, the power switch is turned to an I gear position, and when the temperature of the hot air gun is reduced and cooled, the power switch is turned off, so that the heat gun can be used after the temperature of the hot air gun is reduced and cooled, and the heat gun is used for: when the hot air gun is used or just after the hot air gun is used, the metal part of the air supply outlet does not need to be touched to prevent scalding; in the production process, if a hot air gun is not used for a short time, only the power switch is required to be turned to the I gear position; if operation failure occurs in the production process, please immediately turn off the power switch, adjust the temperature control switch to the lowest temperature, and unplug the power supply; when the hot air gun is in standing, the gun mouth is kept upward to protect the heating wire from being damaged.

Example 2

The process for improving the corrosion resistance of the ground gas pipeline provided by the embodiment is approximately the same as that of the embodiment 1, and the main difference is as follows: heating the surface of the natural gas pipeline at the temperature of 35 ℃;

the preparation process of the hot melt adhesive comprises the following steps: adding xylene solution when the temperature is raised to 130 ℃; when the temperature drops to 75 ℃, the ethanol precipitant is added.

Example 3

The process for improving the corrosion resistance of the ground gas pipeline provided by the embodiment is approximately the same as that of the embodiment 1, and the main difference is as follows: heating the surface of the natural gas pipeline at the temperature of 40 ℃;

the preparation process of the hot melt adhesive comprises the following steps: adding xylene solution when the temperature is raised to 135 ℃; when the temperature is reduced to 80 ℃, the ethanol precipitant is added.

The invention improves the anti-corrosion effect of the anti-corrosion coating by removing impurities on the surface of the gas pipeline and then removing oil stain, sandy soil and water, avoids the anti-corrosion coating from being separated from the gas pipeline, adopts the double-layer anti-corrosion paint, ensures that the formed anti-corrosion coating can prolong the service life of the gas pipeline, avoids water and the like in the air to cause corrosion of the gas pipeline, prepares the hot melt adhesive by using the polyethylene vinyl acetate grafted maleic anhydride monomer as a base polymer, enhances the cohesiveness of the hot melt adhesive, simultaneously has certain crystallization capacity due to the introduction of polar group after the modification of the maleic anhydride, prevents the movement of a molecular chain due to the association of hydrogen bonds, improves the thermal property, ensures that the hot melt adhesive has the anti-corrosion effect, improves the anti-corrosion effect on the gas pipeline, changes the traditional mode of heating by adopting a liquefied gas spray gun, and ensures that no open fire exists in the anti-corrosion construction process of the ground gas pipeline, the method has the advantages that the method is quick to operate, the finished product is attractive after construction is completed, the safety is improved, the multilayer corrosion prevention is formed by the anticorrosive coating, the hot melt adhesive and the heat shrinkable sleeve, and the corrosion prevention effect on the gas pipeline can be effectively improved.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.