Simulation system and method for atomization anticorrosion area of inner wall of large-diameter pipeline

Abstract

The invention discloses a large-diameter pipeline inner wall atomization anticorrosion area simulation system and method, and belongs to the field of power plant chemistry, and the system comprises an atomization nozzle, an atomization device, an observation pipeline, a liquid drop observation plate, an artificial intelligence model, a corrosion measuring instrument, and a camera. The atomization device provides water for simulating atomization of the inner wall of the large-diameter pipeline; the observation pipeline is a barrel-shaped white plastic film; a liquid drop observation plate is arranged at an outlet of the observation pipeline, the camera and the liquid drop observation plate are respectively connected with an artificial intelligence model, and the artificial intelligence model outputs an analysis result to the corrosion measuring instrument. The system can effectively simulate the actual working condition of the site, the simulation method is simple, ingenious and practical, on one hand, the atomization corrosion prevention area of the inner wall of the large-diameter pipeline is visually visualized through the white transparent barrel-shaped plastic film and the pigment, and on the other hand, through the camera, the artificial intelligence model, the liquid drop observation plate, the corrosion measuring and calculating instrument and other advanced means, the large-diameter pipeline inner wall corrosion prevention area is obtained. The method plays an important role in evaluation of field actual large-diameter pipeline inner wall atomization corrosion prevention.

Description

Technical Field

[0001] The invention belongs to the field of power plant chemistry, and in particular relates to a system and method for simulating a large-diameter pipeline inner wall atomization anti-corrosion area. Background Art

[0002] According to calculations, the water consumption rate of conventional wet cooling units is about 0.8m 3 / (s.GW), while the water consumption rate of direct air-cooled units is only 0.15m 3 / (s.GW), the water-saving benefits are considerable. In coal-rich and water-deficient areas, a large number of 600MW and 1000MW ultra-supercritical direct air-cooling units have been built and put into operation.

[0003] The corrosion products and dissolved impurities of direct air-cooled condensers have become the main source of pollution for condensate in air-cooled units, which have direct or indirect hazards to the operation of the units, mainly reflected in the following aspects: (1) Operational corrosion of direct air-cooled condensers causes corrosion and deposition of carbon steel components of condensers. The wall thickness of air-cooled heat dissipation pipes is mostly 1.5 mm. Long-term operation corrosion may still lead to local thinning failure, which may easily cause air or pollutants to leak in, causing increased turbine back pressure or water vapor quality pollution.

[0004] (2) The corrosion of direct air-cooled condensers will increase the burden on the condensate polishing system. A large amount of corrosion products from the air-cooled condenser will contaminate the filter element of the polishing pre-filter, causing the pre-filter to be frequently backwashed or even replaced prematurely. The anion exchange resin in the mixed bed will be seriously contaminated with iron, the desalination efficiency will be reduced, and the service life of the resin will be shortened.

[0005] (3) Increasing the pH value of feed water can reduce the corrosion of direct air-cooled condensers, but high pH value of feed water will cause deposition at the throttling part of the water vapor system.

[0006] By adding an alkalizer or oxidant with a high liquid phase distribution coefficient into the main exhaust pipe of the direct air-cooled condenser, the pH value or redox potential of the liquid film on the carbon steel surface is increased, so that a dense and stable protective oxide film is formed on the metal surface, thereby achieving the purpose of slowing down the corrosion of the direct air-cooled condenser during operation.

[0007] Since the main exhaust steam pipeline of the direct air-cooled condenser is tens of meters long and the exhaust steam velocity is huge, there is no video observation probe or relevant measuring point in the main exhaust steam pipeline. Therefore, no matter the unit is started or stopped or in operation, it is impossible to see which areas and positions of the inner wall of the main exhaust steam pipeline are covered by the droplets of the agent atomized by the nozzle when the agent is atomized in the main exhaust steam pipeline, driven by the high-velocity exhaust steam. The only way is for the maintenance personnel to enter the main exhaust steam pipeline during the unit shutdown period and visually observe which areas of the inner wall are corroded and which areas are not corroded. Summary of the invention

[0008] In order to solve the problems existing in the prior art, the present invention provides a large-diameter pipeline inner wall atomization anti-corrosion area simulation system and method, which effectively simulates the actual working conditions on site, and the simulation method is simple and practical. On the one hand, through the white transparent barrel-shaped plastic film and edible coloring, the anti-corrosion area and position after the addition of the atomized medicine can be seen most simply and intuitively. On the other hand, through multiple cameras, droplet observation plates, artificial intelligence models, and corrosion calculators, sufficient basis and solid foundation are laid for the effective and reliable evaluation conclusion of the atomization anti-corrosion situation of the inner wall of large-diameter pipelines on site.

[0009] To realize the above simulation method, the technical contents adopted by the present invention are as follows: In a first aspect, the present invention provides a large-diameter pipeline inner wall atomization anti-corrosion area simulation system, comprising: an atomization nozzle, an atomization device, an observation pipeline, a droplet observation plate, an artificial intelligence model, a corrosion calculator, and a camera; The atomizing nozzle is arranged on the inner wall of the observation pipe, and the atomizing nozzle is connected to an atomizing device; the observation pipe is reduced in proportion to the large diameter pipe; The inlet end of the observation pipe is provided with an air supply device, and the outlet end is provided with a droplet observation plate; The atomizing device provides water for atomizing the inner wall of a simulated large-diameter pipe; The observation pipe is a transparent pipe; the droplet observation board is a white board; the water is added with pigment; The camera observes the area covered by the inner wall of the pipeline, the area size and the colored spots formed on the droplet observation plate. The artificial intelligence model determines the atomization anti-corrosion condition of the inner wall of the large-diameter pipeline and sends it to the corrosion measuring instrument.

[0010] As a further improvement of the present invention, the observation duct comprises a transparent barrel-shaped plastic film, and the transparent barrel-shaped plastic film is maintained in a long duct shape by wind support during operation of the air supply device.

[0011] As a further improvement of the present invention, the atomizing device includes a metering pump and a water tank, and the water tank is connected to the atomizing nozzle through a pipeline and the metering pump.

[0012] As a further improvement of the present invention, the air supply device is an industrial fan.

[0013] As a further improvement of the present invention, a plurality of atomizing nozzles are arranged at the inlet end of the observation pipe.

[0014] As a further improvement of the present invention, the inlet section, middle section and outlet section of the observation pipeline are all provided with cameras, and the cameras are respectively connected to the artificial intelligence model and the corrosion calculator.

[0015] A simulation method, based on the large diameter pipeline inner wall atomization anti-corrosion area simulation system, comprises: Obtain the length and diameter of the large-diameter pipeline; reduce the actual length, diameter, and theoretically calculated exhaust air velocity of the large-diameter pipeline in equal proportion; The air volume of the air supply device is adjusted to simulate different wind speeds in the pipeline; several atomizing nozzles are arranged at the inlet end of the observation pipeline; The colored water is atomized and driven by the wind from the air supply device to form small colored droplets on the inner wall of the observation pipe. Observe the location and size of the area covered by the colored atomized droplets on the inner wall of the pipe driven by wind; Observe the formation of colored spots on the droplet observation plate at the outlet end of the pipeline; The camera observes the location and size of the area covered on the inner wall of the pipeline and the colored spots formed on the droplet observation plate. The artificial intelligence model determines the atomization anti-corrosion condition of the inner wall of the large-diameter pipeline and sends it to the corrosion meter.

[0016] As a further improvement of the present invention, the camera observes the area position and size of the area covered by the inner wall of the pipeline and the colored spots formed on the droplet observation plate, and the artificial intelligence model judges the atomization anti-corrosion condition of the inner wall of the large diameter pipeline, including: The camera records the distribution of droplets on the inner wall and the distribution of droplets at different time periods; The camera records the spots on the droplet observation plate, continuously recording the process of spot formation and change; The artificial intelligence model obtains the law of atomization corrosion protection of the inner wall of large-diameter pipelines based on the droplet distribution on the inner wall and the spots on the droplet observation plate.

[0017] As a further improvement of the present invention, the droplet distribution on the inner wall of the pipeline and the spot results of the droplet observation plate are observed, and the image recognition, deep learning, and result analysis functions of the artificial intelligence model are fully entered through the camera to calculate the area and density of the droplet coverage area, and evaluate the uniformity and coverage rate of the anti-corrosion droplets; compare the data of different time periods to analyze the change trend of the droplet distribution over time; The spots on the droplet observation plate are counted and measured, and the number, size and distribution of the spots are recorded. The correlation between the spots and the distribution of droplets on the inner wall is analyzed to verify whether the anti-corrosion droplets can float with the wind to the end of the pipeline. The spot position, spot size, number of spots, spot color depth and other parameters of the droplet observation plate are analyzed through an artificial intelligence model, and the analysis results are transmitted to the corrosion meter.

[0018] As a further improvement of the present invention, the artificial intelligence model obtains the law of atomization corrosion protection of the inner wall of a large diameter pipeline according to the inner wall droplet distribution and the droplet observation plate spots, including: Evaluate the coverage rate of anti-corrosion droplets based on the ratio of the area covered by the inner wall droplets to the total area of ​​the inner wall of the pipeline; set a reasonable coverage rate threshold to determine whether the anti-corrosion effect meets the standard; analyze the uniformity of droplet distribution to determine whether there are obvious blank areas or over-concentrated areas; The corrosion calculator inputs the relevant parameters of the actual large-diameter pipeline on site, combines the analysis results given by the artificial intelligence model, and comprehensively considers evaluation indicators such as coverage, uniformity, and terminal reach, and ultimately gives an evaluation conclusion on the atomization anti-corrosion condition of the inner wall of the large-diameter pipeline.

[0019] Compared with the prior art, the present invention has the following advantages: The present invention provides a method for simulating the atomized corrosion protection area of ​​the inner wall of a large-diameter pipeline. The method is ingeniously conceived, and the corresponding simulation method for the site is simple, feasible, and practical. The most important thing is that on the one hand, the atomized corrosion protection area of ​​the inner wall of the large-diameter pipeline is intuitively visualized, and on the other hand, the camera, artificial intelligence model, droplet observation plate, and corrosion calculator give full play to their advanced nature, which plays an important role in the evaluation conclusion of the atomized corrosion protection of the inner wall of the large-diameter pipeline on site. According to the size and position of the corrosion protection area obtained from the simulation test, the position and number of the nozzles installed in the main exhaust steam pipeline on site can be effectively guided. The optimal nozzle arrangement can fully disperse the agent solution to the maximum extent and as widely as possible to every corner of the inner wall of the main exhaust steam pipeline, which is conducive to achieving the expected goal of reducing the iron content at the outlet of the condensate pump of the water vapor system after adding the medicine. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are for explanation purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. In the drawings: Figure 1 It is a schematic diagram of a method for simulating the atomization anti-corrosion area of ​​the inner wall of a large-diameter pipeline according to the present invention. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0022] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0024] In order to simulate the on-site working conditions and to be able to immediately and intuitively observe the anti-corrosion area after the addition of the atomized agent, so that the atomized agent droplets can cover the inner wall area of ​​the main exhaust steam pipe to the maximum extent and as widely as possible, the present invention provides a large-diameter pipeline inner wall atomization anti-corrosion area simulation system and method.

[0025] Example 1 The present invention provides a large-diameter pipeline inner wall atomization anti-corrosion area simulation system, comprising: an atomization nozzle 6, an atomization device, an observation pipeline 2, a droplet observation plate 8, an artificial intelligence model 9, a corrosion calculator 10, and a camera 11; The atomizing nozzle 6 is arranged on the inner wall of the observation pipe 2, and the atomizing nozzle 6 is connected to an atomizing device; the atomizing nozzle 6 and the atomizing device are both proportionally reduced to the equipment for large-diameter pipes; The inlet end of the observation pipe 2 is provided with an air supply device, and the outlet end is provided with a droplet observation plate 8; The atomizing device provides water for atomizing the inner wall of a simulated large-diameter pipe; The observation pipe 2 is a transparent pipe; the droplet observation plate 8 is a white plate; and pigment is added to the water.

[0026] The camera 11 observes the area position and size of the area covered by the inner wall of the pipe 2 and the colored spots formed on the droplet observation plate 8. The artificial intelligence model 9 determines the atomization corrosion protection condition of the inner wall of the large-diameter pipe and sends it to the corrosion measuring instrument 10.

[0027] The simulation system of the present invention constructs a simulation environment close to reality to evaluate the atomization anti-corrosion effect of the inner wall of large-diameter pipes of direct air-cooled units by means of proportional reduction, transparent observation, wind simulation and pigment marking. The system has the advantages of low cost, simple operation and strong intuitiveness, and can provide strong technical support and reference basis for practical engineering applications. The large-diameter pipe inner wall atomization anti-corrosion area simulation system provided by the present invention evaluates the atomization anti-corrosion effect in an intuitive and economical way by proportionally reducing the actual equipment and constructing a simulation environment.

[0028] Key components such as the atomizing nozzle 6, the atomizing device, and the observation pipe 2 are all proportionally reduced according to the actual size of the large-diameter pipe and its related equipment. This ensures that the fluid dynamic characteristics and the distribution of the anti-corrosion droplets close to the real ones are simulated in a smaller space. Specifically, the observation pipe 2 includes a transparent barrel-shaped plastic film, which is formed into a pipe shape by internal support. Optionally, the atomizing device includes a metering pump 5 and a water tank 3, and the water tank 3 is connected to the atomizing nozzle 6 through a pipe and the metering pump 5.

[0029] The atomizing device provides water required for simulating the atomization of the inner wall of a large diameter pipe, and is connected to the atomizing nozzle 6 arranged on the inner wall of the observation pipe 2 through a pipe. The atomizing nozzle 6 is responsible for atomizing the water into fine droplets to simulate the dosing process in the actual antiseptic process.

[0030] An air supply device (such as an industrial fan) is provided at the inlet end of the observation pipe 2 to simulate the wind speed in a large diameter pipe. By adjusting the air volume of the air supply device, the wind speed in the observation pipe 2 can be controlled, thereby simulating the movement trajectory and coverage area of ​​the antiseptic droplets under different wind speed conditions.

[0031] The observation pipe 2 is made of transparent material, such as transparent plastic or glass, so that the distribution of droplets on the inner wall of the pipe can be directly observed, and intuitive data of the anti-corrosion effect can be obtained without stopping the machine for maintenance.

[0032] A white board is set at the outlet end of the observation pipe 2 as a droplet observation board 8. When the anti-corrosion droplets are driven to the end of the pipe under the action of wind, colored spots will be formed on the droplet observation board 8. These spots can verify whether the anti-corrosion droplets can float with the wind to the end of the inner wall of the pipe, thereby evaluating the comprehensiveness of the anti-corrosion effect.

[0033] In order to observe the distribution of the droplets more clearly, a pigment (such as red food pigment) is added to the atomized water. In this way, the atomized droplets will form obvious color marks on the inner wall of the observation pipe 2 and the droplet observation plate 8, which is convenient for recording and analysis.

[0034] In addition, the present invention also provides a simulation method, based on a large diameter pipeline inner wall atomization anti-corrosion area simulation system, comprising the following steps: Obtain the length and diameter of the large-diameter pipeline; reduce the actual length, diameter, and theoretically calculated exhaust air velocity of the large-diameter pipeline in equal proportion; The air supply device adjusts the air volume to simulate different wind speeds in the pipeline; a plurality of atomizing nozzles 6 are arranged at the inlet end of the observation pipeline 2; The air supply device delivers the colored water into the atomizing nozzle 6, and the water is atomized and then acts on the air supply device to form small colored droplets on the inner wall of the observation pipe 2; Observe the location and size of the area covered by the inner wall of the pipe 2 driven by the colored atomized droplets driven by the air supply device; Observe the formation of colored spots on the droplet observation plate 8 at the outlet end of the pipe 2; The camera 11 observes the position and size of the area covered by the inner wall of the pipe 2 and the colored spots formed on the droplet observation plate 8. The artificial intelligence model 9 determines the atomization corrosion protection condition of the inner wall of the large-diameter pipe and sends it to the corrosion measuring instrument 10.

[0035] This simulation method aims to reproduce the distribution of atomized anti-corrosion droplets in large-diameter pipes in a laboratory environment by reducing the scale. Proportionally reducing the actual length and diameter of the large-diameter pipe and the theoretical exhaust velocity is the key to ensuring that the simulation test can accurately reflect the actual working conditions. By reducing the scale, the fluid dynamics of the large pipe can be simulated in a smaller space.

[0036] The air volume of the air supply device (such as an industrial fan) can be adjusted to simulate different wind speeds in the pipeline. Wind speed is one of the important factors affecting the distribution of atomized droplets. By accurately controlling the wind speed, the movement trajectory and coverage area of ​​the droplets in the actual pipeline can be simulated.

[0037] Arranging several atomizing nozzles at the inlet end of the observation pipeline can simulate the situation of multiple dosing points in the actual pipeline. The number and position of the atomizing nozzles can be adjusted according to actual needs to more accurately simulate the actual working conditions.

[0038] The colored water is fed into the atomizing nozzle, and after being atomized, the water forms small colored droplets under the action of the air supply device. The distribution of these droplets on the inner wall of the observation pipe can intuitively reflect the coverage area and area size of the anti-corrosion droplets.

[0039] A droplet observation plate 8 is provided at the outlet of the observation pipe to collect the droplets driven to the end of the pipe by the wind. The colored spots formed on the droplet observation plate 8 can further verify whether the anticorrosive droplets can float with the wind to the end of the inner wall of the pipe.

[0040] By recording and observing the droplet distribution on the inner wall of the pipeline and the spots on the droplet observation plate 8, a preliminary assessment of the atomization corrosion protection of the inner wall of a large diameter pipeline can be made. These data can be used to optimize the corrosion protection plan and adjust parameters such as the dosing point and wind speed.

[0041] By proportionally reducing the actual parameters of large-diameter pipes, accurately controlling the air volume of the air supply device, arranging multiple atomizing nozzles, and using colored water for visual observation, the distribution of atomized anti-corrosion droplets in large-diameter pipes can be simulated more accurately. This method not only has the advantages of low cost and easy operation, but also can intuitively reflect the anti-corrosion effect, providing strong technical support for actual engineering applications. Therefore, it can be considered that this simulation method has high feasibility in practical applications.

[0042] As an optional solution, the following specific solution can be obtained for preliminarily evaluating the atomization corrosion protection of the inner wall of a large diameter pipeline by recording and observing the distribution of droplets on the inner wall of the pipeline and the spots on the droplet observation plate 8: 1. Data collection and recording a. Recording the distribution of droplets on the inner wall: Use a high-definition camera or video camera 11 to photograph the inner wall of the observation pipe and record the distribution of droplets at different time periods (eg, every few minutes).

[0043] Multiple shooting angles can be set to ensure full capture of droplet coverage on the inner wall.

[0044] The location and time of each shooting point were recorded for subsequent analysis.

[0045] b. Spot recording on the droplet observation plate 8: A fixed camera or video camera is set in front of the droplet observation plate 8 to continuously record the process of spot formation and change. The time of each shooting point is also recorded to compare with the distribution of droplets on the inner wall.

[0046] 2. Data Processing and Analysis a. Droplet distribution analysis: Import the captured droplet distribution images of the inner wall into the image processing software for image enhancement and denoising. Use the image analysis function to calculate the area and density of the droplet coverage area, and evaluate the uniformity and coverage of the antiseptic droplets. Compare the data of different time periods to analyze the change trend of droplet distribution over time.

[0047] Specifically, observe the droplet distribution on the inner wall of the pipeline 2 and the spot results on the observation plate, and enter the image recognition, deep learning, and result analysis functions of the artificial intelligence model 9 through the camera 11 to calculate the area and density of the droplet coverage area, and evaluate the uniformity and coverage rate of the anti-corrosion droplets; compare data from different time periods, and analyze the changing trend of droplet distribution over time.

[0048] b. Spot analysis: Count and measure the spots on the droplet observation plate 8, and record the number, size and distribution of the spots. Analyze the correlation between the spots and the distribution of droplets on the inner wall to verify whether the anti-corrosion droplets can float with the wind to the end of the pipeline.

[0049] Specifically, the spots on the observation plate are counted and measured, and the number, size and distribution of the spots are recorded; the correlation between the spots and the distribution of droplets on the inner wall is analyzed to verify whether the anti-corrosion droplets can float to the end of the pipeline with the wind. The artificial intelligence model is used to analyze multiple parameters such as the spot position, spot size, spot number, spot color depth, etc. on the observation plate, and the analysis results are transmitted to the corrosion calculator.

[0050] 3. Evaluation indicators and conclusions a. Coverage rate assessment: The coverage rate of the anti-corrosion droplets is assessed based on the ratio of the area covered by the inner wall droplets to the total area of ​​the inner wall of the pipeline. A reasonable coverage rate threshold is set to determine whether the anti-corrosion effect meets the standard.

[0051] b. Uniformity assessment: Analyze the uniformity of droplet distribution to determine whether there are obvious blank areas or over-concentrated areas. Uniformity assessment helps optimize parameters such as dosing points and wind speed to improve the anti-corrosion effect.

[0052] c. Terminal reachability assessment: The spots on the droplet observation plate 8 are used to evaluate whether the anticorrosive droplets can float with the wind to reach the end of the pipeline. The number, size and distribution of spots can serve as an important basis for judging the end reachability.

[0053] d. Comprehensive evaluation and conclusion: Based on comprehensive evaluation indicators such as coverage, uniformity and terminal reach, a preliminary evaluation conclusion on the atomization anti-corrosion of the inner wall of large-diameter pipelines is given. Based on the evaluation results, improvement suggestions and optimization plans are proposed to provide reference for actual engineering applications.

[0054] Evaluate the coverage rate of anti-corrosion droplets based on the ratio of the area covered by the inner wall droplets to the total area of ​​the inner wall of the pipeline; set a reasonable coverage rate threshold to determine whether the anti-corrosion effect meets the standard; analyze the uniformity of droplet distribution to determine whether there are obvious blank areas or over-concentrated areas; Specifically, the corrosion measuring instrument 10 inputs the relevant parameters of the actual large-diameter pipeline on site (such as diameter, wall thickness, metal material), combines the analysis results given by the artificial intelligence model, and comprehensively evaluates the coverage, uniformity, and terminal reachability, and finally gives an evaluation conclusion on the atomization anti-corrosion condition of the inner wall of the large-diameter pipeline.

[0055] 4. Subsequent verification and optimization If conditions permit, the simulation test results can be compared with the anti-corrosion effects in the actual unit for verification. According to the verification results, the parameters and conditions of the simulation test can be adjusted to further optimize the simulation method. Continuously accumulate data and experience to improve the accuracy and reliability of the simulation test.

[0056] Example 2 like Figure 1 As shown, the present invention provides a method for simulating the atomization anti-corrosion area of ​​the inner wall of a large-diameter pipeline. The items required for the simulation method include an iron wire 1, an observation pipe 2 (a transparent barrel-shaped plastic film), a water tank 3, edible coloring 4, a metering pump 5, an atomizing nozzle 6, an industrial fan 7, and white paper 8.

[0057] A transparent pipe-shaped plastic film is used as the material for the simulation test (which is equivalent to the main exhaust metal pipe on site). The iron wire 1 stretches the pipe-shaped plastic film and places it on the ground, thereby forming a circular observation pipe 2 for the simulation test.

[0058] The circular observation duct 2 of the simulation test has an industrial fan 7 placed in front of it, and the air volume of the industrial fan can be adjusted to achieve different wind speeds. During the operation of the industrial fan, through its wind flow and wind support, the observation duct 2 continues to be a horizontally placed cylinder, which is conducive to observing the anti-corrosion area.

[0059] An atomizing nozzle 6 is arranged at the inlet end of the observation pipe 2, so as to facilitate observation of the atomized liquid droplets being driven by high-speed wind force and reaching the anti-corrosion area of ​​the inner wall of the observation pipe 2.

[0060] A metering pump 5 is connected to the atomizing nozzle through a plastic pipe and a quick-plug connector, and the metering pump 5 serves as a power source for water to be atomized by the nozzle. The flow range of the metering pump is adjustable, and the atomizing flow rate is easy to change.

[0061] The suction pipe of the metering pump is inserted into the water tank 3, and a certain color of food coloring 4 is dripped into the water tank 3, and stirred evenly with a glass rod to make the water have color. The color of the coloring includes but is not limited to red, orange, yellow, green, cyan, blue, and purple.

[0062] After the colored water is atomized, small colored droplets are formed on the inner wall of the white transparent observation pipe 2, so that the position (i.e., the anti-corrosion area) and the size of the area covered by the inner wall of the observation pipe 2 driven by the high-speed wind can be visually observed.

[0063] The specific steps of the method are as follows: First check the length, diameter and other parameters of the large diameter pipe; The actual length and diameter of the large-diameter pipeline, the exhaust wind speed and other parameters calculated theoretically, each parameter is reduced according to a certain ratio.

[0064] All parameters in the simulation method have been scaled down according to the actual working conditions on site.

[0065] In order to observe the anti-corrosion area after the atomization of the agent, a transparent pipe-shaped film is used as the material (which is equivalent to the main exhaust metal pipe on site), and the wire mesh stretches the pipe-shaped film to form an observation pipe 2. The wire mesh stretches the pipe-shaped plastic film and places it on the ground, thereby forming a circular observation pipe 2 for the simulation test. The length of the observation pipe 2 is 10m.

[0066] An industrial fan is placed directly in front of the observation pipe 2. The circular observation pipe 2 of the simulation test has an industrial fan placed in front of it. The air volume of the industrial fan can be adjusted to achieve different wind speeds. During the operation of the industrial fan, through its wind flow and wind support, the observation pipe 2 continues to be a horizontally placed cylinder, which is conducive to observing the anti-corrosion area. The air volume (0~30000m³ / h) of the industrial fan can be adjusted to simulate different wind speeds of 0~10m / s in the pipe.

[0067] A plurality of atomizing nozzles are arranged at the inlet end of the observation pipe 2, so as to facilitate observation of the atomized liquid droplets being driven by the high velocity wind force and reaching the anti-corrosion area of ​​the inner wall of the observation pipe 2.

[0068] A metering pump is connected to the nozzle as the power source for atomization. The flow range of the metering pump (0~10L / h) can be adjusted. The flow range of the metering pump is adjustable, making it easy to change the atomization flow rate.

[0069] The suction pipe of the metering pump is inserted into the water tank, a certain color of food coloring is dripped into the water tank, and a glass rod is used to stir it evenly so that the water has color. The color of the coloring includes but is not limited to red, orange, yellow, green, cyan, blue, and purple.

[0070] The suction pipe of the metering pump is inserted into the water tank. After the colored water is atomized, small colored droplets are formed on the inner wall of the white transparent observation pipe 2, so that it is easy to observe the position (i.e., the anti-corrosion area) and area size of the area covered by the inner wall of the observation pipe 2 driven by the high-speed wind of the industrial fan.

[0071] A piece of white paper is placed at the outlet end of the observation pipe 2. After the colored water is atomized, the colored small droplets are driven by the wind of the industrial fan to form colored spots on the white paper at the outlet end of the observation pipe 2. As the simulation test time increases, the colors of certain areas on the white paper are concentrated, indicating that the atomized droplets can be driven to the outside of the end of the observation pipe 2.

[0072] The present invention uses a transparent pipe-shaped plastic film as a simulation test material, and can visually observe the coverage of the inner wall of the pipe by atomized liquid droplets, which is impossible to achieve with traditional methods.

[0073] Furthermore, wind speed and flow control: by precisely controlling the air volume of the industrial fan and the flow of the metering pump, the high-speed wind force and atomization effect in the actual unit are simulated to ensure the accuracy of the test results.

[0074] Further, visual marking: red food coloring is added to the water so that the atomized droplets form obvious red marks on the inner wall of the pipe, making it easier to observe and record the location and area of ​​the anti-corrosion area.

[0075] Preferably, by setting different simulation times (such as 10, 30, and 60 minutes), the coverage of the atomized droplets at different times is observed and analyzed to provide a reference for the time dimension for practical applications.

[0076] Further preferably, a white paper is placed at the outlet end of the pipe, and the size of the area on the white paper where the atomized droplets are driven by the wind is observed and recorded to verify whether the medicine can float with the wind to the end of the inner wall of the pipe.

[0077] Example 3 The specific implementation modes of the present invention will be described in detail below with reference to the accompanying drawings.

[0078] When adding chemicals to the main exhaust pipe of a direct air-cooled unit, there is no video monitoring probe in the pipe and no other measurement point information. Therefore, it is impossible to visually determine which areas of the inner wall of the main exhaust pipe will be covered by the atomized droplets. The only way is to observe which areas are corroded and which areas are not corroded by entering the main exhaust pipe after the unit is shut down. Based on this, it is urgent to study a simulation method for the atomization anti-corrosion area of ​​the inner wall of a large-diameter pipeline. After reducing the relevant parameters on site by a certain proportion, a simulation test is built through a simulation method, so that the anti-corrosion area can be seen most intuitively.

[0079] like Figure 1 As shown, the present invention provides a method for simulating the atomization anti-corrosion area of ​​the inner wall of a large-diameter pipeline, using a transparent pipe-shaped (1 meter in diameter) plastic film as a simulation test material, and an iron wire 1 stretches the pipe-shaped plastic film and places it on the ground, thereby forming a circular observation pipeline 2 (1 meter in diameter) for the simulation test.

[0080] In the simulation test, an industrial fan 7 is placed in front of the circular observation duct 2, and the air volume of the industrial fan is adjusted to 28260m³ / h, corresponding to a wind speed of 10m / s for the 1-meter diameter observation duct 2. During the operation of the industrial fan, the observation duct 2 remains a horizontal cylinder through its wind flow and wind support, which is conducive to observing the anti-corrosion area.

[0081] An atomizing nozzle 6 is arranged at the inlet end of the observation pipe 2, so as to facilitate observation of the atomized liquid droplets being driven by high-speed wind force and reaching the anti-corrosion area of ​​the inner wall of the observation pipe 2.

[0082] A metering pump 5 is connected to the atomizing nozzle through a plastic pipe and a quick-connect connector. The metering pump serves as a power source for water to be atomized by the nozzle. The flow rate of the metering pump is adjusted to 10L / h, which means that the atomizing flow rate of the nozzle is 10L / h.

[0083] The suction pipe of the metering pump is inserted into the water tank 3, red food coloring 4 is dripped into the water tank, and stirred evenly with a glass rod to make the water red.

[0084] After the red water is atomized, small red droplets are formed on the inner wall of the white transparent observation pipe 2, so that the position (i.e., the anti-corrosion area) and the size of the area covered by the inner wall of the observation pipe 2 under the drive of the high-speed wind can be visually observed.

[0085] After the simulation test was continued for 10, 30, and 60 minutes, the size of the area formed when the small droplets were driven by the 10m / s wind force onto the white paper at the outlet of the observation pipe 2 was observed. This also shows that after the medicine is atomized, it can float with the wind force to the end of the inner wall of the pipe.

[0086] In order to carry out automated data collection and analysis, a camera is set at the outlet of the observation pipe 2, and the camera is connected to a computer to accurately obtain the coverage of the inner wall of the observation pipe 2 and the simulation process; the image recognition technology and the automated data acquisition system are used to record and analyze the coverage of the atomized droplets in the simulation test in real time to improve the test efficiency and accuracy.

[0087] The present invention cleverly uses a transparent barrel-shaped plastic film as the material of the observation pipe 2, and places an industrial fan at the inlet end of the observation pipe 2 to simulate the high flow rate of the main exhaust pipe on site; white paper is placed at the outlet end of the observation pipe 2, and the color change of the white paper is observed during the simulation test, indicating that the atomized droplets are driven to the end of the observation pipe 2 by the high flow rate wind force.

[0088] In summary, pigment is added to the water of the atomizing device of the present invention, the atomizing nozzle is arranged on the inner wall of the observation pipe, and the atomizing nozzle and the atomizing device are proportionally reduced with the equipment for large-diameter pipes; an air supply device is arranged at the inlet end of the observation pipe, and a droplet observation plate is arranged at the outlet end; the atomizing device provides water for simulating the atomization of the inner wall of the large-diameter pipe; the observation pipe is a barrel-shaped white plastic film; cameras are arranged at the inlet section, middle section and outlet section of the observation pipe, and a droplet observation plate is arranged at the outlet of the observation pipe, and the camera and the droplet observation plate are respectively connected to the artificial intelligence model, and the artificial intelligence model outputs the analysis results to the corrosion calculator. The simulation system can effectively simulate the actual working conditions on site, and the simulation method is simple, ingenious and practical. On the one hand, its advantages are that the atomized anti-corrosion area of ​​the inner wall of the large-diameter pipe is intuitively visualized through the white transparent barrel-shaped plastic film and pigment, and on the other hand, it plays an important role in the evaluation of the atomized anti-corrosion of the inner wall of the actual large-diameter pipe on site through advanced means such as cameras, artificial intelligence models, droplet observation plates, and corrosion calculators.

[0089] In order to enable those skilled in the art to understand the characteristics and effects of the present invention, the following is a general description and definition of the terms and expressions mentioned in the specification and claims. Unless otherwise specified, all technical and scientific terms used in the text are the common meanings understood by those skilled in the art for the present invention. In the event of a conflict, the definition in this specification shall prevail.

[0090] The theories or mechanisms described and disclosed herein, whether correct or incorrect, should not limit the scope of the present invention in any way, that is, the content of the present invention can be implemented without being limited by any specific theory or mechanism. The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be regarded as the scope of protection of the present invention.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. 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 solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A large diameter pipeline inner wall atomization anti-corrosion area simulation system, characterized in that: include: Atomizing nozzle (6), atomizing device, observation pipe (2), droplet observation plate (8), artificial intelligence model (9), corrosion measuring instrument (10), camera (11); The atomizing nozzle (6) is arranged on the inner wall of the observation pipe (2), and the atomizing nozzle (6) is connected to an atomizing device; the observation pipe (2) is reduced in proportion to the large diameter pipe; The inlet end of the observation pipe (2) is provided with an air supply device, and the outlet end is provided with a droplet observation plate (8); The atomizing device provides water for atomizing the inner wall of a simulated large-diameter pipe; The observation pipe (2) is a transparent pipe; the droplet observation plate (8) is a white plate; wherein pigment is added to the water; The camera (11) observes the position and size of the area covered by the inner wall of the pipe (2) and the colored spots formed on the droplet observation plate (8), and the artificial intelligence model (9) determines the atomization corrosion protection condition of the inner wall of the large-diameter pipe and sends it to the corrosion measuring instrument (10).

2. A large diameter pipeline inner wall atomization anti-corrosion area simulation system according to claim 1, characterized in that: The observation pipe (2) comprises a transparent barrel-shaped plastic film, which is supported by the iron wire (1) and the wind force during the operation of the air supply device to maintain a long pipe shape.

3. A large diameter pipeline inner wall atomization anti-corrosion area simulation system according to claim 1, characterized in that: The atomizing device comprises a metering pump (5) and a water tank (3); the water tank (3) is connected to the atomizing nozzle (6) via a pipeline and the metering pump (5).

4. A large diameter pipeline inner wall atomization anti-corrosion area simulation system according to claim 1, characterized in that: The air supply device is an industrial fan (7).

5. The large diameter pipeline inner wall atomization anti-corrosion area simulation system according to claim 1 is characterized in that: A plurality of atomizing nozzles (6) are arranged at the inlet end of the observation pipe (2).

6. A large diameter pipeline inner wall atomization anti-corrosion area simulation system according to claim 1, characterized in that: The inlet section, middle section and outlet section of the observation pipeline (2) are all provided with cameras (11), and the cameras (11) are respectively connected to the artificial intelligence model (9) and the corrosion measuring instrument (10).

7. A simulation method, based on the large diameter pipeline inner wall atomization anti-corrosion area simulation system according to claims 1 to 6, characterized in that: include: Obtain the length and diameter of the large-diameter pipeline; reduce the actual length, diameter, and theoretically calculated exhaust air velocity of the large-diameter pipeline in equal proportion; The air supply device adjusts the air volume to simulate different wind speeds in the pipeline; a plurality of atomizing nozzles (6) are arranged at the inlet end of the observation pipeline (2); The colored water is atomized and driven by the wind from the air supply device to form small colored droplets on the inner wall of the observation pipe (2); Observe the location and size of the area covered by the colored atomized droplets on the inner wall of the observation pipe (2) driven by wind; Observe the formation of colored spots on the droplet observation plate (8) at the outlet end of the pipe (2); The camera (11) observes the position and size of the area covered on the inner wall of the pipe (2) and the colored spots formed on the droplet observation plate (8). The artificial intelligence model (9) determines the atomization corrosion protection condition of the inner wall of the large diameter pipe and sends it to the corrosion measuring instrument (10).

8. The simulation method according to claim 7, characterized in that: The camera (11) observes the position and size of the area covered on the inner wall of the pipe (2) and the colored spots formed on the droplet observation plate (8), and the artificial intelligence model (9) determines the atomization corrosion protection of the inner wall of the large diameter pipe, including: The camera (11) records the distribution of liquid droplets on the inner wall and records the distribution of liquid droplets in different time periods; The camera (11) records the spots on the droplet observation plate (8), and continuously records the process of spot formation and change; The artificial intelligence model (9) obtains the law of atomization corrosion protection of the inner wall of a large diameter pipeline based on the distribution of droplets on the inner wall and the spots on the droplet observation plate (8).

9. The simulation method according to claim 8, characterized in that: Observe the droplet distribution on the inner wall of the pipeline (2) and the spot results on the droplet observation plate (8), and enter the image recognition, deep learning, and result analysis functions of the artificial intelligence model (9) through the camera (11), calculate the area and density of the droplet coverage area, and evaluate the uniformity and coverage rate of the anti-corrosion droplets; compare data from different time periods and analyze the change trend of droplet distribution over time; The spots on the droplet observation plate (8) are counted and measured, and the number, size and distribution position of the spots are recorded; the correlation between the spots and the distribution of droplets on the inner wall is analyzed to verify whether the anti-corrosion droplets can float with the wind to the end of the pipeline; the artificial intelligence model (9) is used to analyze multiple parameters such as the spot position, spot size, spot number, spot color depth, etc. of the droplet observation plate (8), and the analysis results are transmitted to the corrosion measuring instrument (10).

10. The simulation method according to claim 9, characterized in that: The artificial intelligence model (9) obtains the law of atomization corrosion protection of the inner wall of a large diameter pipeline based on the distribution of droplets on the inner wall and the spots on the droplet observation plate (8), including: Evaluate the coverage rate of anti-corrosion droplets based on the ratio of the area covered by the inner wall droplets to the total area of ​​the inner wall of the pipeline; set a reasonable coverage rate threshold to determine whether the anti-corrosion effect meets the standard; analyze the uniformity of droplet distribution to determine whether there are obvious blank areas or over-concentrated areas; The corrosion calculator (10) inputs the relevant parameters of the actual large-diameter pipeline on site, combines the analysis results given by the artificial intelligence model, and comprehensively considers evaluation indicators such as coverage, uniformity, and terminal reachability, and finally gives an evaluation conclusion on the atomization anti-corrosion condition of the inner wall of the large-diameter pipeline.

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