阅读说明：本技术 一种报废金属管道的处理方法 (Method for treating scrapped metal pipeline ) 是由 张国良 宋纯民 刘希武 庞平 温泉嵩 宋业恒 董雪琟 李昕 张继军 孙伟 瞿帆 于 2019-11-15 设计创作，主要内容包括：本发明公开了一种报废金属管道的处理方法,涉及报废管道处理技术领域,该处理方法包括将至少一个电源负极连接所述报废金属管道的金属部分,电源正极连接地面,在第一电压的条件下通电,所述第一电压≥1.23V,然后,交换电源正负极,在第二电压的条件下通电。本发明采用管道涂层电解水剥离技术,可以提高管道金属和涂层的缝隙,加大管道金属表面与空气和水的接触面积,有效提高电化学腐蚀速率。(The invention discloses a method for processing a scrapped metal pipeline, which relates to the technical field of scrapped pipeline processing and comprises the steps of connecting at least one power supply cathode with a metal part of the scrapped metal pipeline, connecting a power supply anode with the ground, electrifying under the condition of a first voltage, wherein the first voltage is more than or equal to 1.23V, then exchanging the anode and the cathode of the power supply, and electrifying under the condition of a second voltage. The invention adopts the pipeline coating electrolytic water stripping technology, can improve the gap between the pipeline metal and the coating, increases the contact area between the pipeline metal surface and air and water, and effectively improves the electrochemical corrosion rate.)

1. A method for processing a scrapped metal pipeline is characterized by comprising the following steps: connecting at least one power supply cathode with the metal part of the scrapped metal pipeline, connecting a power supply anode with the ground, and electrifying under the condition of a first voltage which is not less than 1.23V;

then, the positive electrode of the power supply is connected to the ground, the negative electrode of the power supply is connected to the ground, and the power is supplied under the condition of a second voltage.

2. The method for treating the scrapped metal pipes according to claim 1, wherein the energization time under the condition of the first voltage is not less than 7 days.

3. The method for treating the scrapped metal pipe as recited in claim 1, wherein the second voltage is not less than 0.05V.

4. The method for treating the scrapped metal pipe as recited in claim 3, wherein the second voltage is less than or equal to 1.0V.

5. The method for treating the scrapped metal pipes according to claim 3, wherein the energizing time under the condition of the second voltage is not less than 7 days.

6. The method for processing the scrapped metal pipe according to any one of claims 1 to 5, wherein when the power is applied under the first voltage condition, a plurality of negative electrodes of a power supply connected with the metal part of the scrapped metal pipe are provided;

the processing method comprises the step of arranging the connection points of the power supply cathodes and the metal part of the scrapped metal pipeline at intervals, wherein the maximum distance of the interval arrangement is less than or equal to 100 m.

7. The method for treating the scrapped metal pipeline according to any one of claims 1 to 5, wherein the minimum distance between the position of the positive electrode of the power supply connected with the ground and the pipeline is not less than 5 m.

8. The method for treating the abandoned metal pipeline according to any one of claims 1 to 5, wherein before the abandoned metal pipeline is electrified, the method for treating the abandoned metal pipeline comprises the step of removing or electrically insulating all metal parts in contact with the abandoned metal pipeline.

9. The method for treating the scrapped metal pipeline according to any one of claims 1 to 5, wherein when the surface of the part of the scrapped metal pipeline used for being connected with the power supply negative electrode is wrapped with a surface anticorrosive layer and/or an insulating layer, the method comprises the step of stripping the surface anticorrosive layer and/or the insulating layer on the surface of the metal pipeline before electrifying so that the power supply negative electrode is connected with the metal part of the metal pipeline.

10. The method for treating the abandoned metal pipeline according to any one of claims 1 to 5, wherein the abandoned metal pipeline comprises an oil field gathering pipeline, a crude oil conveying pipeline or a city water supply buried pipeline.

Technical Field

The invention relates to the technical field of scrapped pipeline treatment, in particular to a method for treating scrapped metal pipelines.

Background

Underground pipelines are complex in use and have the function of conveying various fluids such as water, heat, gas and oil. The current situation that many pipelines operate at present is long in duration, long in age and many in hidden troubles.

After the metal pipeline is built, along with the expansion of the activity range of human beings, the use of the environment and the land around a plurality of pipelines is changed dramatically, and the scrapped pipelines in partial sections cannot be removed due to the factors of economy, safety, environmental protection and the like, such as the sections of farmlands, forest lands and the like, adjacent industrial, commercial and civil facilities, road traffic and the like.

The waste metal pipeline is generally filled after being cleaned and can be disassembled and disassembled, and the small-diameter pipeline can be cleaned and discarded on site. The undetached pipeline is coated with an anticorrosive layer, and can be corroded almost completely after being buried underground for a long time, and no related technology for rapidly corroding the abandoned metal pipeline exists at present. Because the surface of the scrapped metal pipeline is coated with an anticorrosive coating or is wrapped with an anticorrosive material, the metal material is difficult to contact with air, and the corrosion rate is low. Buried metal pipelines are different in depth, high in strength and complex in crossing environment, hidden dangers are left for future land utilization, and damage to farmland deep ploughing machines or underground operation mechanical equipment is easily caused.

In view of this, the invention is particularly proposed.

Disclosure of Invention

The invention aims to provide a method for treating a scrapped metal pipeline. The treatment method can accelerate the corrosion of the scrapped metal pipeline and reduce the potential safety hazard existing in the comprehensive utilization of land.

The invention is realized by the following steps:

in a first aspect, an embodiment provides a method for processing a scrap metal pipe, including:

connecting at least one power supply cathode with the metal part of the scrapped metal pipeline, connecting a power supply anode with the ground, and electrifying under the condition of a first voltage which is not less than 1.23V;

then, the positive electrode of the power supply is connected to the ground, the negative electrode of the power supply is connected to the ground, and the power is supplied under the condition of a second voltage.

In a second aspect, embodiments provide a method of treating a discarded metal pipeline according to any one of claims 1 to 5, the discarded metal pipeline comprising an oil field gathering pipeline, a crude oil transportation pipeline, or a buried pipeline for municipal water supply.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic representation of a first energization condition in accordance with an embodiment of the present invention;

FIG. 2 is a schematic view of a second embodiment of the present invention in a second energized condition.

Icon:

1-a power supply; 2-a metal pipe; 3-a ground point; 4-a metal moiety; 5-anticorrosive coating.

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. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

Specifically, an embodiment of the present invention provides a method for processing a discarded metal pipe, including:

connecting the cathode of at least one power supply 1 with the metal part 4 of the scrapped metal pipeline 2, connecting the anode of the power supply 1 with the ground, electrifying under the condition of a first voltage which is not less than 1.23V, and electrolyzing trace water infiltrated between the metal part 4 of the pipeline and the anticorrosive coating to generate H₂The gap volume index is expanded to make the air and water more likely to contact the pipe, see figure 1.

Then, the positive electrode of the power supply 1 is connected to the ground, the negative electrode of the power supply 1 is connected to the ground, and the power supply is powered on under the condition of the second voltage, that is, when the power supply is powered on under the condition of the second voltage, the positive electrode and the negative electrode of the power supply 1 are exchanged once when the power supply is powered on under the first voltage condition, please refer to fig. 2. That is, under the condition of the second voltage, a plurality of positive electrodes of the power source 1 are connected with the metal part 4 of the scrapped metal pipe 2.

The method for treating the scrapped metal pipeline provided by the embodiment of the invention adopts a pipeline coating electrolytic water stripping technology (the pipeline is electrified under the condition of the first voltage), so that the gap between the pipeline metal and the coating can be increased, the contact area between the pipeline metal surface and air and water is enlarged, and the electrochemical corrosion rate is increased.

In an alternative embodiment, there are a plurality of grounding points 3 to which the power supply 1 is connected to ground.

In an alternative embodiment, the energization time under the condition of the first voltage is 7 days or more.

In an alternative embodiment, the second voltage is ≧ 0.05V.

In an alternative embodiment, the second voltage is ≦ 1.0V.

After the power is switched on under the condition of the first voltage, the anode and the cathode of the power supply 1 are exchanged, and the second voltage is controlled to be not lower than 0.05V and not higher than 1.0V, so that the electrochemical reaction occurs on the metal surface, and the scrapped metal pipeline 2 is more easily and rapidly corroded.

In an alternative embodiment, the energization time under the condition of the second voltage is 7 days or more.

In an alternative embodiment, when the power supply is powered on under the first voltage condition, the number of the negative electrodes of the power supply 1 connected with the metal part 4 of the scrapped metal pipe 2 is multiple. It should be noted that the negative electrodes of the power supplies 1 herein refer to negative electrodes of the power supplies under the first voltage condition, and the metal portion 4 connected to the scrapped metal pipe 2 is a positive electrode of the power supplies 1 under the second voltage condition.

The treatment method comprises the step of arranging the connection points of the cathodes of the power supplies 1 and the metal part 4 of the scrapped metal pipeline 2 at intervals, wherein the maximum distance of the interval arrangement is less than or equal to 100m, so that the metal part 4 of the metal pipeline 2 can be uniformly corroded.

In an alternative embodiment, the minimum distance between the position of the positive pole of the power supply 1 connected with the ground and the pipeline is more than or equal to 5 m.

In an alternative embodiment, before the power is applied to the discarded metal pipe 2, the treatment method includes that all metal parts in contact with the discarded metal pipe 2 need to be removed or electrically insulated.

In an alternative embodiment, when the surface of the part of the scrapped metal pipeline 2, which is used for being in contact with the negative electrode of the power supply 1, is wrapped with the surface anticorrosive layer 5 and/or the insulating layer, the treatment method comprises the step of peeling off the surface anticorrosive layer 5 and/or the insulating layer on the surface of the metal pipeline 2 before electrifying, so that the negative electrode of the power supply 1 is connected with the metal part 4 of the metal pipeline 2.

The embodiment of the invention provides a method for processing a scrapped metal pipeline 2 according to the embodiment, wherein the scrapped metal pipeline 2 comprises an oil field gathering and transporting pipeline, a crude oil transporting pipeline or a city water supply buried pipeline.

In addition, the treatment method provided by the invention does not need to inject electrolyte into the soil, reduces the risk of soil pollution, and is low in cost and environment-friendly.

The features and properties of the present invention are described in further detail below with reference to examples.