Graphene oxide pipeline coating thermal sensing device

Abstract

The invention discloses a graphene oxide pipeline film-coated thermal sensing device, which effectively prevents a heat tracing pipe freezing problem by introducing graphene oxide, improves the stability of a system in an extremely cold environment, and greatly reduces the risk of equipment performance reduction. Besides, an intelligent frozen pipe detection and prevention mechanism is integrated, a temperature sensing system is combined with a DCS system in a company, the system can monitor the pipeline temperature in real time, the working state is adjusted in time, the freezing phenomenon is effectively prevented, and the automation level and the intelligent level of the system are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline protection, and specifically relates to a graphene oxide pipeline coating thermal sensor device. Background Art

[0002] In the cold northern regions, the temperature can reach around minus 50 degrees Celsius during the extreme cold winter. The traditional pipeline design concept is to add a heating pipe to the main pipeline, wrap it with insulation cotton, and then hit it with iron sheet to complete it. It often faces the occurrence of frozen pipes and burst pipes, affecting the normal operation of the system.

[0003] Thermal sensing materials can quickly transfer heat energy and prevent pipes from freezing due to low temperatures. However, in practical applications, thermal sensing materials still need to overcome technical issues such as stability, concentration optimization, heating power dependence, environmental adaptability, cost, and preparation process. In addition, due to the long length of pipes exposed outdoors and the large frozen area, there is also the problem of being unable to quickly determine the location of the problem when the pipes are frozen. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the above problems and / or the problems existing in the prior art, the present invention is proposed.

[0006] Therefore, the purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for preparing a graphene oxide pipeline coating thermal sensor device.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a method for preparing a graphene oxide pipeline coating thermal sensor device, characterized in that: comprising:

[0008] preparing a graphene oxide solution;

[0009] Pre-treat the pipeline surface;

[0010] Repeatedly spraying or brushing the graphene oxide solution on the pretreated pipeline surface;

[0011] Before installing the pipeline, the sprayed pipeline shall be restored;

[0012] Temperature sensors are installed at equal distances on the finished product after the reduction treatment;

[0013] Wrap with thermal insulation cotton and iron sheet.

[0014] As a preferred embodiment of the preparation method of the present invention, wherein: the graphene oxide solution is prepared, wherein the concentration of the prepared graphene oxide solution is 1 to 5 mg / L.

[0015] As a preferred embodiment of the preparation method of the present invention, the pipeline surface is pretreated, wherein the pretreatment includes surface cleaning, rust treatment, surface drying, surface roughening treatment, cleaning of surface dust and application of primer before coating.

[0016] As a preferred embodiment of the preparation method of the present invention, the sprayed pipe is subjected to reduction treatment, wherein the reduction treatment includes chemical reduction and photochemical reduction.

[0017] As a preferred embodiment of the preparation method of the present invention, the chemical reduction method is to use a reducing agent to treat the sprayed graphene oxide coating, and the reducing agent is at least one of hydrogen, hydrazine, hydrazine hydrate or ascorbic acid.

[0018] As a preferred embodiment of the preparation method of the present invention, the photochemical reduction method is to irradiate graphene oxide with ultraviolet light or laser.

[0019] As a preferred embodiment of the preparation method of the present invention, the graphene oxide solution is repeatedly sprayed or brushed, wherein the number of layers of the graphene oxide solution coating is 10 to 20 layers.

[0020] As a preferred solution of the preparation method of the present invention, temperature sensors are installed at equal distances on the finished product after reduction treatment, wherein the sensor probes are installed on the pipeline coating.

[0021] As a preferred solution of the preparation method described in the present invention, the sensor can be connected to the company system to update the temperature of the pipeline at each location in real time and track and repair it in time.

[0022] Another object of the present invention is to overcome the deficiencies in the prior art and provide a graphene oxide pipeline coating thermal sensor device for use in pipeline antifreeze.

[0023] Beneficial effects of the present invention:

[0024] (1) The present invention introduces graphene oxide to effectively prevent the freezing of heating pipes, improve the stability of the system in extremely cold environments, and significantly reduce the risk of equipment performance degradation.

[0025] (2) The excellent thermal conductivity of graphene oxide improves the efficiency of the entire thermal sensing system, allowing thermal energy to be transferred more quickly and evenly, thereby improving the performance of the system.

[0026] (3) By optimizing the structure of the heating pipe and introducing graphene oxide on its surface, the cold resistance of the heating pipe is improved, avoiding the problem that traditional materials are easily damaged in low temperature environments.

[0027] (4) The intelligent frozen pipe detection and prevention mechanism is integrated, and the temperature sensing system is combined with the company's internal DCS system. The system can monitor the pipe temperature in real time, adjust the working status in time, and effectively prevent the occurrence of freezing, thereby improving the automation and intelligence level of the system.

[0028] (5) After rigorous durability testing and optimization, the solution ensures that the system has stable performance in extreme environments and extends the service life of the heat sensing device of the heating pipe. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the embodiments of the specification.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0032] Example 1

[0033] This embodiment provides a graphene oxide pipeline coating thermal sensing device, comprising the following steps:

[0034] (1) Preparing a graphene oxide solution, including:

[0035] Take 2.5g of graphite and add 60ml of 18M H2SO4 (98%). Stir in an ice bath, then slowly add 1.25g of NaNO3 and 7.5g of KMnO4 and grind. Keep the temperature below 5℃ within 2 hours, then heat in a 35℃ water bath for 1 hour.

[0036] Keep the temperature below 60°C, add 120 ml of ultrapure water for dilution; then keep the temperature at 95°C in a water bath with magnetic stirring for 0.5 hours;

[0037] Then add 100 ml of 6% H2O2, filter while hot, and wash with 1M HCl (use BaCl2 to detect SO4 2- whether to divide by zero);

[0038] Then, the mixture was centrifuged and washed at 12000 r / min until neutral, dried under vacuum at 50°C for 24 hours, and then cut into pieces and ground into graphene oxide powder.

[0039] Take 0.5g of graphite oxide powder, add it to (1:2) ethanol-water solution, make the volume to 250ml, and then disperse it by ultrasonic for 6 hours;

[0040] The supernatant was taken by centrifugation at 4000 r / h to obtain a 2 mg / L graphene oxide solution.

[0041] (2) Pre-treat the pipeline surface to remove impurities and dirt on the surface, including:

[0042] Personnel protection: Workers must wear appropriate protective equipment (such as dust masks, goggles, protective gloves, protective clothing, etc.);

[0043] On-site arrangement: Set up safety fences around the water pipes to prevent non-staff from entering the operation area;

[0044] Equipment inspection: Ensure that cleaning and coating equipment is in good condition to avoid malfunctions during construction.

[0045] Surface cleaning: First, use a high-pressure water gun to rinse the surface of the pipe to remove dust, dirt and other surface dirt. High-pressure water cleaning should ensure that no obvious dirt is left on the outer surface of the pipe; when there is grease on the surface of the pipe, use an appropriate degreaser to wipe it to ensure that the grease is thoroughly removed.

[0046] Rust treatment: According to the rust condition of the water pipe, use a wire brush, grinder or sandblaster to grind the rusted area until the original color of the metal is exposed; the polished surface should be smooth and free of residual oxide scale; if mechanical rust removal cannot completely remove deep rust, use an appropriate amount of pickling agent for chemical treatment; after completion, neutralize and rinse with clean water to ensure that there is no chemical residue on the surface.

[0047] Surface drying: Use a dry cloth or industrial hot air blower to dry the surface of the water pipe to ensure that no moisture remains; the drying process should be thorough to prevent moisture from affecting the adhesion of subsequent coatings.

[0048] Surface roughening: Through light sandblasting or coarse grinding, the surface roughness can be appropriately increased to enhance the adhesion of the coating. The roughening treatment should be uniform to avoid excessive damage to the pipeline surface.

[0049] Clean surface dust: Use clean compressed air or dust cloth to clean the surface again to ensure that there is no dust and impurities to achieve the best clean state before coating.

[0050] Primer application before coating: Apply anti-rust primer, ensuring that the primer is evenly coated on the entire outer surface of the water pipe. The primer should be fully dry before proceeding to the next coating.

[0051] It should be noted that during the coating process, try to choose sunny weather to avoid high humidity, rain, etc. After the primer is completed, try to shorten the exposure time to prevent dust or impurities from adhering again and affecting the coating quality.

[0052] (3) Selecting 10 to 20 layers, repeatedly spraying or brushing the pretreated pipe surface with the graphene oxide solution, so that the graphene oxide aqueous solution completely covers the pipe surface, and drying it for 48 hours to allow the aqueous solution on the pipe surface to completely evaporate.

[0053] (4) Before installing the pipeline, the sprayed pipeline shall be restored, including:

[0054] Use the reducing agent ascorbic acid to treat the sprayed graphene oxide coating, and evenly apply or spray the reducing agent on the surface of the pipe to make it fully contact with the graphene oxide. After the reaction is sufficient, rinse with water to remove the residual reducing agent and dry it.

[0055] (5) Temperature sensors are installed at equal intervals on the finished products after reduction treatment, and the sensor probes are installed on the pipeline coating; the sensors can be connected to the company system to update the temperature of the pipeline at each location in real time, and track maintenance in a timely manner (because graphene oxide has excellent thermal conductivity, a heat conduction device can be installed on the pipeline covered with graphene oxide. When the sensor probe finds that the temperature of this section of the pipeline is too low, it is directly heated up to temperature).

[0056] (6) Wrap the thermal insulation cotton on the basis of (5).

[0057] (7) Wrap the base of (6) with iron sheet.

[0058] Example 2

[0059] The difference between this embodiment and embodiment 1 is that the reduction method in step (4) is replaced by using ultraviolet light or laser to irradiate graphene oxide to cause a photochemical reduction reaction, specifically, using an ultraviolet light source to irradiate the coating for several hours, or using a laser to irradiate for a short time at a specific wavelength; the remaining steps are the same as in embodiment 1.

[0060] Comparative Example 1

[0061] The difference between this embodiment and embodiment 1 is that the reduction treatment in step (4) is not performed, and the remaining steps are the same as those in embodiment 1.

[0062] Compared with Examples 1 and 2, the performance of the graphene oxide coating of the device that has not been reduced is greatly reduced. This is because the corrosion resistance of graphene oxide is much lower than that of reduced graphene oxide, and reduction treatment can improve the corrosion resistance by about 40% to 60%. The conductivity of unreduced graphene oxide is poor, but after reduction, the conductivity can be increased by about 70% to 90%, which is crucial for pipeline coatings that require anti-static or conductive properties. Reduction treatment can significantly enhance the strength and wear resistance of the graphene layer, improve the mechanical properties of the pipeline surface by about 30% to 50%, and extend the service life of the coating. Therefore, reduction treatment is an essential step in the application of graphene oxide coating. Failure to perform reduction treatment will significantly reduce the effect of the coating, affect the corrosion resistance, conductivity and mechanical properties of the pipeline, and thus reduce the service life of the pipeline.

[0063] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the present invention.

Claims

1. A method for preparing a graphene oxide pipeline coating thermal sensor device, characterized in that: include, preparing a graphene oxide solution; Pre-treat the pipeline surface; Repeatedly spraying or brushing the graphene oxide solution on the pretreated pipeline surface; Before installing the pipeline, the sprayed pipeline shall be restored; Temperature sensors are installed at equal distances on the finished product after the reduction treatment; Wrap with thermal insulation cotton and iron sheet.

2. The preparation method according to claim 1, characterized in that: The graphene oxide solution is prepared, wherein the concentration of the prepared graphene oxide solution is 1 to 5 mg / L.

3. The preparation method according to claim 1, characterized in that: The pipeline surface is pretreated, wherein the pretreatment includes surface cleaning, rust treatment, surface drying, surface roughening, cleaning of surface dust and application of primer before coating.

4. The preparation method according to claim 1, characterized in that: The sprayed pipe is subjected to reduction treatment, wherein the reduction treatment includes chemical reduction and photochemical reduction.

5. The preparation method according to claim 4, characterized in that: The chemical reduction method is to use a reducing agent to treat the sprayed graphene oxide coating, and the reducing agent is at least one of hydrogen, hydrazine, hydrazine hydrate or ascorbic acid.

6. The preparation method according to claim 4, characterized in that: The photochemical reduction method is to irradiate graphene oxide with ultraviolet light or laser.

7. The preparation method according to claim 1, characterized in that: The graphene oxide solution is repeatedly sprayed or brushed, wherein the number of layers of the graphene oxide solution coating is 10 to 20 layers.

8. The preparation method according to claim 1, characterized in that: The temperature sensors are installed at equal intervals on the finished product after the reduction treatment, wherein the sensor probes are installed on the pipeline coating.

9. The preparation method according to claim 8, characterized in that: The sensor can be connected to the company's system to update the temperature of pipelines at various locations in real time and track maintenance in a timely manner.

10. Application of the graphene oxide pipeline coating thermal sensor device prepared by the preparation method according to any one of claims 1 to 9 in pipeline antifreeze.