Method for rapidly eliminating foam in discharged seawater circulating water

Abstract

The invention discloses a method for rapidly eliminating foam in seawater circulating water drainage, and belongs to the field of seawater once-through cooling circulating water drainage, and the method comprises the following steps: using a high-speed camera to regularly collect images of a water area with foam elimination, establishing an algorithm model according to the collected images, calculating a foam coverage rate, and manually setting a foam coverage rate threshold value; the calculated foam coverage rate is compared with a threshold value, when the threshold value is reached, a spray head is started, water spraying is started for defoaming, and when the threshold value is not reached, the spray head is standby and waits for starting; when the spray head is started, the spray head is controlled and adjusted by the controller, and the optimal spraying angle is adopted for spraying water for defoaming; after water spraying and defoaming are carried out for a certain time, a stop instruction is issued to the nozzle, water spraying is stopped, and defoaming is finished. The purpose of rapidly and accurately eliminating foam in discharged seawater circulating water is achieved, and the production cost and the labor intensity of workers are greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of seawater direct-flow cooling circulating water drainage, and in particular to a method for rapidly eliminating foam in seawater circulating water drainage. Background Technology

[0002] In large-scale industrial production sectors such as power and chemical industries, seawater direct-flow cooling circulating water systems have become one of the mainstream industrial cooling solutions due to their core advantages, including high cooling efficiency and abundant water supply. However, foaming during the drainage process remains a key challenge hindering environmental compliance and aquatic ecosystem protection. Foam formation in seawater circulating water drainage is not caused by a single factor. Besides the physical effects of high-speed water flow impact and water oscillation during drainage, residual disinfectants and other chemical agents in the circulating water system, surfactants introduced through production processes, and the high salinity of seawater itself all contribute to the continuous generation and accumulation of foam at the river's end. Large amounts of foam floating on the surface not only cause significant visual pollution and affect the aesthetics of the surrounding aquatic environment, but may also spread with the water flow, posing a potential threat to the balance of the marine ecosystem, thus falling short of current stringent environmental control requirements. To address the aforementioned foaming problem, the industry has developed two main technical solutions: chemical defoaming and physical defoaming. However, both methods have significant and unavoidable drawbacks. Chemical defoaming involves adding defoaming agents to foamy waters, using the agents to reduce the surface tension of the foam and disrupt its stability. However, this method has significant limitations: defoaming agent residue can inhibit the activity of seawater microorganisms, interfering with subsequent biological treatment processes and disrupting the aquatic ecosystem. Furthermore, in high-salinity seawater environments, the efficiency of defoaming agents decreases significantly, requiring a substantial increase in dosage to achieve the desired effect. This not only directly raises treatment costs but also poses a risk of secondary pollution due to excessive agent use, making it difficult to balance environmental protection and economic efficiency. Physical defoaming methods, as a relatively environmentally friendly alternative, have evolved into various forms, including high-pressure spraying, interception, and mechanical defoaming. Among these, high-pressure spraying is widely used due to its ease of operation and lack of chemical reagents. This method involves pumping seawater and spraying it at high pressure onto areas of foam accumulation, using the impact force of the water flow to break down the foam structure. However, in practical applications, its drawbacks have become increasingly apparent: firstly, high-pressure spraying requires the continuous pumping of large amounts of seawater, resulting in high water consumption; secondly, the sprayed water flow increases the load on subsequent water treatment systems, raising overall operating costs; and thirdly, this method has limited effectiveness in removing highly viscous foam, often requiring repeated spraying to achieve a certain effect, which not only prolongs the defoaming cycle but also further exacerbates energy consumption and water waste. In addition, traditional high-pressure spraying methods lack precise control over the spray direction, and the water flow is mostly indiscriminately diffused, making it difficult to target areas with dense foam, resulting in low defoaming efficiency. At the same time, the spraying time is not adjusted according to the foam generation pattern, which easily leads to situations where "spraying stops before the foam is completely removed" or "spraying continues even after the foam has dissipated", further reducing the rationality and economy of the process. In summary, existing defoaming technologies either pose environmental risks and excessive costs, or suffer from high water consumption, low defoaming efficiency, and insufficient targeting, making it difficult to meet the "fast, efficient, environmentally friendly, and energy-saving" foam treatment needs of industrial production. Given increasingly stringent environmental requirements and the pursuit of cost reduction and efficiency improvement in industrial production, there is an urgent need for a new defoaming method that can precisely adapt to the foam characteristics of seawater circulating water drainage. This method should optimize operational methods to overcome the shortcomings of existing technologies and achieve rapid foam elimination and rational resource utilization. Summary of the Invention

[0003] The technical problem this invention aims to solve is to provide a method for rapidly eliminating foam in seawater circulating water drainage. It addresses the issues of high-pressure spraying methods, such as high water consumption, potential increase in subsequent treatment load, limited effectiveness in removing highly viscous foam, and the need for repeated angle adjustments. This method can efficiently remove foam.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a method for rapidly eliminating foam in seawater circulating water drainage, comprising the following steps: Step 1: Use a high-speed camera to periodically capture images of the water area with foam removal. Step 2: Based on the acquired images, establish an algorithm model to calculate the foam coverage rate, while manually setting the foam coverage rate threshold. Step 3: Compare the calculated foam coverage rate with the threshold. If the threshold is reached, start the nozzle and turn on the water spray to defoam. If the threshold is not reached, the nozzle will standby and wait to be started. Step 4: When the nozzle is started, it is controlled and adjusted by the controller to spray water at the optimal angle to eliminate foam. Step 5: After the water spraying and defoaming process has been running for a certain period of time, a stop command is sent to the nozzle to stop the water spraying and the defoaming process is completed.

[0005] A further improvement to the technical solution of the present invention is as follows: Step 1 is as follows: The high-speed camera acquires images at intervals of 1 minute, and acquires multi-angle images of the water surface at regular intervals. The interference of water surface reflection is eliminated by the ring LED light source, thereby improving the image contrast.

[0006] The further improvement of the technical solution of the present invention is as follows: Step 2 is as follows: Based on image recognition technology and pixel-level semantic segmentation technology, using the pixel-level semantic segmentation model of BiSeNetv2, and utilizing the dual-branch structure of spatial detail branch + semantic branch to balance accuracy and speed, the proportion of the foam coverage area to the total monitoring area is calculated. The formula is: foam coverage rate = (number of foam pixels / total number of effective pixels) × 100%.

[0007] A further improvement of the technical solution of the present invention is that: in step 3, when the threshold is reached, the spatial coordinates of the foam area are calculated; the three-dimensional model of the foam surface is reconstructed using binocular vision technology; based on the disparity map and camera parameters, the spatial coordinates of each point on the surface of the foam area are calculated by triangulation, and the center coordinates P(Xp,Yp,Zp) of the foam water area are calculated.

[0008] A further improvement to the technical solution of this invention lies in the following: the calculation of the optimal injection angle in step 4 is as follows: Step 4.1: Coordinate system establishment: The origin O(0,0) is the center of the nozzle base, the horizontal plane is the X−Y plane, the vertical direction is the Z axis, where Zp is the height difference between the foam surface and the nozzle base, and the horizontal installation height of the nozzle is h. Step 4.2: Calculation of horizontal rotation angle: The horizontal rotation angle θ is determined by the projection coordinates (Xp,Yp) of point P on the X−Y plane: θ=arctan(Yp / Xp); Step 4.3: Pitch angle calculation: The pitch angle ϕ is: ; After the nozzle rotation angle is calculated, the data signal containing the nozzle rotation angle is sent to the nozzle controller, and the water spraying and defoaming is started according to the angle.

[0009] A further improvement to the technical solution of the present invention is that, in step 5, the defoaming time is set to 20 seconds.

[0010] The technological advancements achieved by this invention, due to the adoption of the above-mentioned technical solutions, are as follows: By using a high-speed camera to periodically collect images of foam-containing water areas and calculating the foam coverage rate based on the image data, the defoaming operation is only initiated when the coverage rate reaches a set threshold. This achieves the advantages of on-demand activation and avoids ineffective energy consumption, effectively preventing energy waste caused by continuous idling or premature operation of water pumps. Simultaneously, it accurately matches the dynamic changes in foam generation, ensuring that defoaming operations are only carried out when needed, significantly reducing operating costs. By employing a method of calculating the spatial coordinates of foam areas, the concentrated foam areas are accurately located after the foam coverage rate reaches the target, and then the water pump is controlled to perform targeted defoaming in the target areas. This achieves the advantages of targeted operation and reduced water resource loss, avoiding the water resource waste caused by traditional high-pressure spraying blindly covering the entire water area. Furthermore, the water flow directly acts on the foam-dense areas, quickly destroying the foam structure and significantly improving defoaming efficiency, achieving the core objective of rapid and accurate defoaming. By integrating a continuous control process of timed image acquisition, coverage determination, coordinate positioning, and targeted defoaming, the system achieves the advantages of automation and precision in defoaming operations. It eliminates the need for manual on-site judgment of foam location and start / stop timing, reducing human error. Furthermore, it can continuously adapt to the dynamic distribution characteristics of foam in seawater circulating water drainage, maintaining a stable foam removal effect in the water area and avoiding visual pollution. At the same time, it does not rely on chemical agents, avoiding the impact of chemical residues on seawater microorganisms and subsequent treatment processes, thus balancing environmental protection and practicality. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a flowchart illustrating a method for rapidly eliminating foam in seawater circulating water drainage according to the present invention. Detailed Implementation

[0012] The present invention will be further described in detail below with reference to embodiments: like Figure 1The diagram shows a flowchart of a method for rapidly eliminating foam in seawater circulating water drainage. The core method is high-pressure spraying, where seawater is pumped in and sprayed at high pressure onto areas with high foam concentration. The impact force of the water flow breaks down the foam structure. By performing detailed modeling of the water area image and precisely controlling the angle of the high-pressure spray nozzles and setting the spraying time, the defoaming operation is automated and precise. It eliminates the need for manual on-site judgment of foam location and start / stop timing, reducing human error. Furthermore, it continuously adapts to the dynamic distribution characteristics of foam in seawater circulating water drainage, maintaining a stable foam removal effect. The specific steps are as follows: Step 1: Use a high-speed camera to periodically capture images of the water surface with foam removal; construct a 3D model by using two cameras arranged horizontally to capture images of the water surface from different angles. The camera captures images at 1-minute intervals, periodically acquiring multi-angle images of the water surface. A ring LED light source is used to eliminate water surface reflection interference and improve image contrast.

[0013] Step 2: Based on the acquired images, establish an algorithm model to calculate the foam coverage rate, while manually setting the foam coverage rate threshold. Using image recognition and pixel-level semantic segmentation technologies, and through an intelligent monitoring platform, employ the BiSeNetv2 pixel-level semantic segmentation model, utilizing a dual-branch structure of spatial detail branch + semantic branch to balance accuracy and speed. Calculate the proportion of the foam-covered area to the total monitored area using the formula: Foam Coverage Rate = (Number of Foam Pixels / Total Effective Pixels) × 100%.

[0014] Step 3: Compare the calculated foam coverage rate with the threshold. If the threshold is reached, start the nozzle and start spraying water to defoam. If the threshold is not reached, the nozzle is in standby and waiting to be started. When the threshold is reached, start calculating the spatial coordinates of the foam area. Reconstruct the three-dimensional model of the foam surface using binocular vision technology. Based on the disparity map and camera parameters, calculate the spatial coordinates of each point on the surface of the foam area through triangulation, and calculate the center coordinates P(Xp,Yp,Zp) of the foam water area.

[0015] Step 4: When the nozzle is started, it is controlled and adjusted by the controller to spray water at the optimal angle to eliminate foam. Step 4.1: Coordinate system establishment: The origin O(0,0) is the center of the nozzle base, the horizontal plane is the X−Y plane, the vertical direction is the Z axis, where Zp is the height difference between the foam surface and the nozzle base, and the horizontal installation height of the nozzle is h. Step 4.2: Calculation of horizontal rotation angle: The horizontal rotation angle θ is determined by the projection coordinates (Xp,Yp) of point P on the X−Y plane: θ=arctan(Yp / Xp); Step 4.3: Pitch angle calculation: The pitch angle ϕ is: ; After the nozzle rotation angle is calculated, the data signal containing the nozzle rotation angle is sent to the nozzle controller. The water spray defoaming is started according to the angle. After receiving the start signal, the water pump controller starts the water pump and performs physical defoaming on the target area according to the specified rotation angle.

[0016] Step 5: After a certain period of water spraying for defoaming, a stop command is sent to the nozzle to stop water spraying, and defoaming ends. The defoaming time is set to 20 seconds. When the water pump starts, the timer on the intelligent monitoring platform begins counting. When the set time of 20 seconds is reached, the intelligent monitoring platform sends a stop signal to the water pump controller, and defoaming ends. This invention automatically monitors the amount of foam in the circulating water drainage using a high-speed camera, automatically starting and stopping physical defoaming, achieving the purpose of rapid defoaming in a designated area, realizing automated operation, significantly reducing the labor intensity of on-site personnel, saving labor, and reducing production costs.

[0017] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for rapidly eliminating foam in seawater circulating water drainage, characterized in that: The steps include the following: Step 1: Use a high-speed camera to periodically capture images of the water area with foam removal. Step 2: Based on the acquired images, establish an algorithm model to calculate the foam coverage rate, while manually setting the foam coverage rate threshold. Step 3: Compare the calculated foam coverage rate with the threshold. If the threshold is reached, start the nozzle and turn on the water spray to defoam. If the threshold is not reached, the nozzle will standby and wait to be started. Step 4: When the nozzle is started, it is controlled and adjusted by the controller to spray water at the optimal angle to eliminate foam. Step 5: After the water spraying and defoaming process has been running for a certain period of time, a stop command is sent to the nozzle to stop the water spraying and the defoaming process is completed.

2. The method for rapidly eliminating foam in seawater circulating water drainage according to claim 1, characterized in that: Step 1 is as follows: The high-speed camera acquires images at 1-minute intervals, periodically capturing multi-angle images of the water surface. A ring-shaped LED light source is used to eliminate water surface reflection interference and improve image contrast.

3. The method for rapidly eliminating foam in seawater circulating water drainage according to claim 1, characterized in that: Step 2 is as follows: Based on image recognition technology and pixel-level semantic segmentation technology, the pixel-level semantic segmentation model of BiSeNetv2 is used. By utilizing the dual-branch structure of spatial detail branch + semantic branch, the accuracy and speed are balanced, and the proportion of foam coverage area to the total monitored area is calculated. The formula is: foam coverage rate = (number of foam pixels / total number of effective pixels) × 100%.

4. The method for rapidly eliminating foam in seawater circulating water drainage according to claim 1, characterized in that: In step 3, when the threshold is reached, the spatial coordinates of the foam area are calculated. The three-dimensional model of the foam surface is reconstructed using binocular vision technology. Based on the disparity map and camera parameters, the spatial coordinates of each point on the surface of the foam area are calculated by triangulation, and the center coordinates P(Xp,Yp,Zp) of the foam water area are calculated.

5. The method for rapidly eliminating foam in seawater circulating water drainage according to claim 4, characterized in that: The calculation of the optimal injection angle in step 4 is as follows: Step 4.1: Coordinate system establishment: The origin O(0,0) is the center of the nozzle base, the horizontal plane is the X−Y plane, the vertical direction is the Z axis, where Zp is the height difference between the foam surface and the nozzle base, and the horizontal installation height of the nozzle is h. Step 4.2: Calculation of horizontal rotation angle: The horizontal rotation angle θ is determined by the projection coordinates (Xp,Yp) of point P on the X−Y plane: θ=arctan(Yp / Xp); Step 4.3: Pitch angle calculation: The pitch angle ϕ is: ; After the nozzle rotation angle is calculated, the data signal containing the nozzle rotation angle is sent to the nozzle controller, and the water spraying and defoaming is started according to the angle.

6. The method for rapidly eliminating foam in seawater circulating water drainage according to claim 1, characterized in that: In step 5, the defoaming time is set to 20 seconds.

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