Ship ballast water residual chlorine neutralization system and dosing control method and controller thereof

Abstract

This invention provides a method for controlling the addition of chemicals in a ship's ballast water residual chlorine neutralization system, comprising: S10: obtaining the holding time T of ballast water in the ballast tank; S20: calculating the dynamic standard dosing flow rate Q, the maximum dosing flow rate Qmax, and the minimum dosing flow rate Qmin of the neutralizing agent; wherein, Q = a*T^(-b), Qmax = c*Q, and Qmin = d*Q; S30: after the start of unloading, adding the neutralizing agent to the unloading pipeline at the maximum dosing flow rate Qmax; S40: detecting the current residual chlorine concentration X of the neutralized ballast water in the unloading pipeline; if the current residual chlorine concentration X is greater than a set value, increasing the dosing flow rate of the neutralizing agent; if the current residual chlorine concentration X is less than or equal to the set value, decreasing the dosing flow rate of the neutralizing agent, and when the dosing flow rate of the neutralizing agent decreases to less than or equal to the minimum dosing flow rate Qmin, maintaining the dosing at the minimum dosing flow rate Qmin; S50: repeating the above steps S40 until the unloading is completed. The present invention also provides a residual chlorine neutralization system and controller for ship ballast water.

Description

Technical Field

[0001] This invention relates to the field of ship ballast water treatment technology, and in particular to a ship ballast water residual chlorine neutralization system and its dosing control method and controller. Background Technology

[0002] To control factors such as list, trim, draft, stability, and stress concentration, almost all ships are equipped with ballast water tanks, and additional ballast water is added according to the ship's actual cargo load to ensure navigational safety. Untreated ballast water discharge can cause a series of problems, including biological invasion and marine pollution. Therefore, the International Maritime Organization (IMO) and the U.S. Environmental Protection Agency have established strict regulations for ballast water discharge to protect the marine environment. To meet these regulations, ballast water treatment systems have emerged.

[0003] To kill bacteria and plankton in ballast water, active substances such as sodium hypochlorite are typically added to disinfect it. To prevent potential environmental risks to receiving water bodies from TRO (Total Residual Oxidant) during discharge, both the IMO and the US Environmental Protection Agency require that management systems using active substances to treat ballast water be equipped with neutralization devices. These devices add neutralizing agents to the discharged water to neutralize residual chlorine. Residual chlorine detection devices are installed outside the discharge hull to monitor the residual chlorine concentration in real time, ensuring it remains below 0.1 ppm.

[0004] Currently, during the ballast water treatment process, the minimum concentration of neutralizing agents is generally calculated based on the residual chlorine concentration 24 hours after ballast water treatment. However, according to research, the holding time of ballast water treatment on most ships worldwide is generally more than 10 days. In order to ensure the stable operation of the ship's ballast water treatment system, ships often over-add chemicals during the ballast water treatment process, resulting in a great waste of neutralizing agents. Summary of the Invention

[0005] The purpose of this invention is to provide a method for controlling the addition of chemicals in a ship's ballast water residual chlorine neutralization system. This method can determine the addition flow rate of the neutralizing agent based on the actual holding time of the ballast water in the ballast tank. While ensuring the neutralization effect, it can greatly reduce the amount of neutralizing agent used and avoid waste of the neutralizing agent.

[0006] This invention provides a dosing control method for a ship ballast water residual chlorine neutralization system, the ship ballast water residual chlorine neutralization system including a ballast tank and a discharge pipeline, the discharge pipeline being connected to the ballast tank; the dosing control method includes:

[0007] S10: Obtain the retention time T of the ballast water in the ballast tank;

[0008] S20: Based on the ballast water retention time T, calculate the dynamic standard dosing flow rate Q, maximum dosing flow rate Qmax, and minimum dosing flow rate Qmin of the neutralizing agent; where Q=a*T^(-b), a is the dosing coefficient, b is the dynamic correction factor; Qmax=c*Q, Qmin=d*Q, c is a control coefficient greater than 1, and d is a control coefficient less than 1;

[0009] S30: After the discharge begins, add neutralizing agent into the discharge pipeline at the maximum dosing flow rate Qmax;

[0010] S40: Detect the current residual chlorine concentration X of the neutralized ballast water in the discharge pipeline, and compare the current residual chlorine concentration X with a set value; if the current residual chlorine concentration X is greater than the set value, increase the flow rate of the neutralizing agent; if the current residual chlorine concentration X is less than or equal to the set value, decrease the flow rate of the neutralizing agent, and when the flow rate of the neutralizing agent is reduced to less than or equal to the minimum flow rate Qmin, maintain the addition at the minimum flow rate Qmin;

[0011] S50: Repeat step S40 above until the loading is complete.

[0012] Furthermore, in step S40 above, while maintaining the minimum dosing flow rate Qmin, the current residual chlorine concentration X is continuously monitored. If the current residual chlorine concentration X is less than or equal to the set value, the dosing continues at the minimum dosing flow rate Qmin; if the current residual chlorine concentration X is greater than the set value, the dosing flow rate of the neutralizing agent is increased.

[0013] Furthermore, in step S40 above, the increase or decrease in the flow rate of the neutralizing agent each time does not exceed 20% of the previous flow rate.

[0014] Furthermore, in step S40 above, the amount of increase or decrease in the flow rate of the neutralizing agent each time is 10% of the previous flow rate.

[0015] Furthermore, in step S40 above, there is no upper limit set on the actual maximum flow rate of the neutralizing agent during the loading process.

[0016] Furthermore, the dosing control method also includes:

[0017] Obtain the actual maximum and minimum dosing flow rates of the neutralizing agent during the discharge process; after the discharge is completed, update the database based on the actual maximum dosing flow rate Q1, the actual minimum dosing flow rate Q2, and the ballast water retention time T during this discharge process, and refit the equation of the dynamic standard dosing flow rate Q to correct the dosing coefficient a and the dynamic correction factor b.

[0018] Furthermore, the control coefficient c ranges from 1.1 to 1.5.

[0019] Furthermore, the control coefficient d ranges from 0.6 to 0.9.

[0020] The present invention also provides a controller, comprising:

[0021] A memory, wherein instructions are stored;

[0022] The processor, when the instructions are executed by the processor, implements the dosing control method for the residual chlorine neutralization system of ship ballast water as described above.

[0023] This invention also provides a ship ballast water residual chlorine neutralization system, including the controller described above. The ship ballast water residual chlorine neutralization system further includes a ballast tank, a discharge pipeline, a neutralization dosing device, a residual chlorine detection device, and a timer. The discharge pipeline is connected to the ballast tank. The neutralization dosing device and the residual chlorine detection device are sequentially connected to the discharge pipeline, and the residual chlorine detection device is located downstream of the neutralization dosing device. The neutralization dosing device is used to add neutralizing agent to the discharge pipeline. The residual chlorine detection device is used to detect the residual chlorine concentration of the neutralized ballast water in the discharge pipeline. The timer is used to record the retention time of the ballast water in the ballast tank.

[0024] The timer, the neutralization dosing device, and the residual chlorine detection device are all electrically connected to the controller. The controller is used to control the neutralization dosing device to dosing chemicals based on the ballast water retention time recorded by the timer and the residual chlorine concentration detected by the residual chlorine detection device.

[0025] Furthermore, the neutralization dosing device includes a neutralizing agent storage tank, a dosing pipeline, and a dosing pump. One end of the dosing pipeline is connected to the neutralizing agent storage tank, and the other end of the dosing pipeline is connected to the discharge pipeline. The dosing pump is installed on the dosing pipeline and is a variable frequency pump. The dosing pump is electrically connected to the controller.

[0026] The present invention provides a method for controlling the dosing of a residual chlorine neutralization system in ship ballast water. This method determines the maximum and minimum dosing flow rates of the neutralizing agent (Qmax and Qmin) based on the retention time (T) of the ballast water in the ballast tank. After unloading begins, the agent is first added at the maximum flow rate (Qmax). Simultaneously, the current residual chlorine concentration (X) is detected and compared with a set value to determine the neutralization effect. The dosing flow rate of the neutralizing agent is then adjusted accordingly. This allows the ship's ballast water residual chlorine neutralization system to dosing based on the actual amount of neutralizing agent required during unloading, significantly reducing the amount of neutralizing agent used while ensuring the neutralization effect and avoiding waste. Furthermore, by setting a minimum dosing flow rate (Qmin), when the neutralizing agent dosing flow rate decreases to less than or equal to the minimum flow rate (Qmin), dosing is maintained at the minimum flow rate (Qmin). This reduces the amount of neutralizing agent used and avoids frequent system fluctuations, thus contributing to system stability. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the residual chlorine neutralization system for ship ballast water in an embodiment of the present invention.

[0028] Figure 2 This is a flowchart of the dosing control method for the residual chlorine neutralization system of ship ballast water in an embodiment of the present invention.

[0029] Figure 3 This is a schematic diagram illustrating the relationship between the TRO concentration of ballast water and the retention time of ballast water in an embodiment of the present invention. Detailed Implementation

[0030] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0031] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and claims of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0032] The directional terms such as "up," "down," "left," "right," "front," "back," "top," and "bottom" (if present) used in the specification and claims of this invention are defined by the position of the structures in the drawings and the relative positions of the structures, and are only for the clarity and convenience of expressing the technical solution. It should be understood that the use of directional terms should not limit the scope of protection claimed in this application.

[0033] like Figure 1 and Figure 2As shown, this embodiment of the invention provides a dosing control method for a ship ballast water residual chlorine neutralization system. The ship ballast water residual chlorine neutralization system includes a ballast tank 1 and a discharge pipeline 2, with the discharge pipeline 2 connected to the ballast tank 1. The dosing control method includes:

[0034] S10: Obtain the retention time T of the ballast water in ballast tank 1 (i.e., the residence time of the ballast water in ballast tank 1);

[0035] S20: Based on the ballast water retention time T, calculate the dynamic standard dosing flow rate Q, maximum dosing flow rate Qmax, and minimum dosing flow rate Qmin of the neutralizing agent; where Q=a*T^(-b), a is the dosing coefficient, b is the dynamic correction factor, and both a and b are positive numbers; Qmax=c*Q, Qmin=d*Q, c is a control coefficient greater than 1, d is a control coefficient less than 1, and d is a positive number;

[0036] S30: After the discharge begins, add neutralizing agent to the discharge pipeline 2 at the maximum dosing flow rate Qmax (to ensure the neutralization effect at the initial discharge and prevent the discharge water quality from being substandard due to insufficient dosing at the beginning).

[0037] S40: Detect the current residual chlorine concentration X of the neutralized ballast water in the discharge pipeline 2, and compare the current residual chlorine concentration X with the set value; if the current residual chlorine concentration X is greater than the set value, increase the flow rate of the neutralizing agent; if the current residual chlorine concentration X is less than or equal to the set value, decrease the flow rate of the neutralizing agent, and when the flow rate of the neutralizing agent is reduced to less than or equal to the minimum flow rate Qmin, maintain the minimum flow rate Qmin for dosing (i.e., when the calculated flow rate is less than or equal to the minimum flow rate Qmin, dosing is performed according to the minimum flow rate Qmin).

[0038] During the dosing process at the minimum dosing flow rate Qmin, it is necessary to continuously monitor the current residual chlorine concentration X. If the current residual chlorine concentration X is less than or equal to the set value, the dosing process continues at the minimum dosing flow rate Qmin; if the current residual chlorine concentration X is greater than the set value, the dosing flow rate of the neutralizing agent is increased. This is to prevent the residual chlorine concentration from exceeding the standard during the discharge of ballast water.

[0039] S50: Repeat step S40 above until the loading is complete.

[0040] Specifically, when using active substances such as sodium hypochlorite to treat the ballast water in ballast tank 1, the residual concentration (TRO concentration) of the active substances after reacting with harmful organisms in the ballast water is related to the salinity, temperature, dissolved oxygen, pH value of the ballast water, and the holding time T of the ballast water in ballast tank 1 (i.e., the reaction time between the active substances and harmful organisms in the ballast water). However, based on experimental results and actual operating conditions, considering that: 1. Changes in the salinity, temperature, dissolved oxygen, and pH value of the ballast water have a relatively small impact on the TRO concentration of the ballast water; 2. Changes in the salinity, temperature, dissolved oxygen, and pH value of the ballast water have a relatively small impact on the TRO concentration of the ballast water. Temperature, dissolved oxygen, and pH do not change much during actual shipboard operation. When formulating the equation for the dynamic standard dosing flow rate Q, the design margin is fully considered. Therefore, the relationship between the TRO concentration of ballast water and the salinity, temperature, dissolved oxygen, pH value, and the holding time T of ballast water in ballast tank 1 can be simplified to the relationship between the TRO concentration of ballast water and the holding time T of ballast water in ballast tank 1. At the same time, by combining mathematical statistics and curve fitting, the relationship between the dynamic standard dosing flow rate Q and the holding time T of ballast water can be obtained, that is, Q=a*T^(-b).

[0041] At the same time, such as Figure 3 As shown, the TRO concentration of ballast water decreases with increasing ballast water retention time T, and the rate of TRO concentration decay slows down with increasing time. Therefore, Q and T have an inverse proportional relationship. Figure 3 The figure illustrates the relationship curves between the TRO concentration and the holding time T of ballast water in three groups; where the horizontal axis represents the holding time T of ballast water in hours, and the vertical axis represents the TRO concentration of ballast water in mg / L. According to actual engineering simulation calculations, the above exponential inverse proportional function relationship Q=a*T^(-b) fits well with the relationship curve between the TRO concentration and the holding time T of ballast water.

[0042] The chemical dosing control method for a ship ballast water residual chlorine neutralization system provided in this invention determines the maximum and minimum dosing flow rates of the neutralizing agent, Qmax and Qmin, based on the retention time T of the ballast water in ballast tank 1. After unloading begins, the maximum dosing flow rate Qmax is initially used. Simultaneously, the current residual chlorine concentration X is detected and compared with a set value to determine the neutralization effect. The dosing flow rate of the neutralizing agent is adjusted accordingly. This allows the ship's ballast water residual chlorine neutralization system to dosing based on the actual amount of neutralizing agent required during unloading, significantly reducing the amount of neutralizing agent used while ensuring the neutralization effect and avoiding waste. Furthermore, by setting a minimum dosing flow rate Qmin, when the neutralizing agent dosing flow rate decreases to less than or equal to the minimum dosing flow rate Qmin, the minimum dosing flow rate Qmin is maintained. This reduces the amount of neutralizing agent used and avoids frequent system fluctuations, thus contributing to system stability.

[0043] Furthermore, in this embodiment, in step S40 above, the increase or decrease in the flow rate of the neutralizing agent each time does not exceed 20% of the previous flow rate (for example, if the previous flow rate was 10L / h, then the adjustment range of the flow rate does not exceed 2L / h), thereby avoiding excessive adjustment of the flow rate each time and causing frequent fluctuations in the system. At the same time, it is beneficial for the system to adjust to a flow rate suitable for the current operating conditions during the dosing process.

[0044] Furthermore, in this embodiment, in the above S40 step, the amount of increase or decrease in the flow rate of the neutralizing agent each time is 10% of the previous flow rate.

[0045] Furthermore, in this embodiment, in step S40 above, the actual maximum dosing flow rate of the neutralizing agent during the loading process (i.e., Q1 below) is not set with an upper limit. That is, during the dosing process, the actual maximum dosing flow rate is not set with an upper limit, and the actual minimum dosing flow rate is executed according to the minimum dosing flow rate Qmin (the actual minimum dosing flow rate may be greater than the minimum dosing flow rate Qmin).

[0046] Furthermore, in this embodiment, the values ​​of a and b in step S20 above can be calculated based on actual data. For example, a is 4.8 and b is 0.55, i.e., Q = 4.8 * T^(-0.55). Meanwhile, besides being related to the decay rate of the TRO concentration of the ballast water with the holding time T, a is also related to the discharge flow rate of the ballast water and the concentration of the neutralizing agent during the discharge process: when the concentration of the neutralizing agent remains constant, the larger the discharge flow rate of the ballast water, the larger a is; the smaller the discharge flow rate of the ballast water, the smaller a is; when the discharge flow rate of the ballast water remains constant, the larger the concentration of the neutralizing agent, the smaller a is; the smaller the concentration of the neutralizing agent, the larger a is.

[0047] Furthermore, in this embodiment, the control coefficient c ranges from 1.1 to 1.5, and the control coefficient d ranges from 0.6 to 0.9. Of course, in other embodiments, the ranges of control coefficients c and d can be selected according to the actual situation.

[0048] Furthermore, in this embodiment, the set value in step S40 above can be 0.1 ppm, that is, during the discharge process, the residual chlorine concentration of the ballast water does not exceed 0.1 ppm.

[0049] Furthermore, in this embodiment, in step S40 above, the interval between each detection of residual chlorine concentration can be set to 2 minutes.

[0050] Furthermore, in this embodiment, the dosing control method further includes:

[0051] The actual maximum and minimum dosing flow rates of the neutralizing agent during the discharge process are obtained. After discharge, the database is updated based on the actual maximum and minimum dosing flow rates Q1 and Q2 and the ballast water retention time T, and the equation for the dynamic standard dosing flow rate Q is fitted again to correct the dosing coefficient a and the dynamic correction factor b. This allows the dynamic standard dosing flow rate Q to be continuously corrected and adapted to various operating conditions, improving the applicability of the dosing control method. This correction process can be performed manually or automatically by the system.

[0052] like Figure 1 As shown, this embodiment of the invention also provides a controller 7, comprising:

[0053] Memory, which stores instructions;

[0054] The processor, when the instructions are executed, implements the dosing control method of the residual chlorine neutralization system for ship ballast water described above.

[0055] Furthermore, in this embodiment, the controller 7 is a PLC control device.

[0056] like Figure 1 As shown in the figure, this embodiment of the invention also provides a ship ballast water residual chlorine neutralization system, including the controller 7 described above. The ship ballast water residual chlorine neutralization system also includes a ballast tank 1, a discharge pipeline 2, a neutralization dosing device 3, a residual chlorine detection device 4, and a timer 5. The ballast tank 1 is used to temporarily store ballast water. The discharge pipeline 2 is connected to the ballast tank 1, and the ballast water in the ballast tank 1 can be discharged to the outside of the ship through the discharge pipeline 2. The neutralization dosing device 3 and the residual chlorine detection device 4 are connected to the discharge pipeline 2 in sequence, and the residual chlorine detection device 4 is located downstream of the neutralization dosing device 3 (i.e., the residual chlorine detection device 4 is connected to the downstream pipeline after the neutralization dosing device 3). The neutralization dosing device 3 is used to add neutralizing agent to the discharge pipeline 2. The residual chlorine detection device 4 is used to detect the residual chlorine concentration of the neutralized ballast water in the discharge pipeline 2. The timer 5 is used to record the holding time of the ballast water in the ballast tank 1 (i.e., the timer 5 records the time from the end of each ballasting process to the start of the next discharge).

[0057] The timer 5, the neutralization dosing device 3, and the residual chlorine detection device 4 are all electrically connected to the controller 7. The controller 7 is used to control the neutralization dosing device 3 to dosing chemicals according to the dosing control method described above, based on the ballast water holding time recorded by the timer 5 and the residual chlorine concentration detected by the residual chlorine detection device 4.

[0058] Furthermore, the timer 5 can be a timing device built into the controller 7, or it can be an external timing device.

[0059] Furthermore, such as Figure 1As shown, in this embodiment, the neutralization dosing device 3 includes a neutralization agent storage tank 31 for storing neutralizing agents, a dosing pipeline 32, and a dosing pump 33. One end of the dosing pipeline 32 is connected to the neutralization agent storage tank 31, and the other end is connected to the discharge pipeline 2. The dosing pump 33 is installed on the dosing pipeline 32. The dosing pump 33 is a variable frequency pump, which allows for adjustment of its dosing flow rate. The dosing pump 33 is electrically connected to the controller 7, which controls the dosing flow rate of the dosing pump 33.

[0060] Furthermore, such as Figure 1 As shown, in this embodiment, a discharge pump 6 is installed on the discharge pipeline 2. The neutralization dosing device 3 is connected to the pipeline before the inlet of the ballast tank 1 and the discharge pump 6. The residual chlorine detection device 4 is connected to the pipeline after the outlet of the discharge pump 6. The neutralizing agent added by the neutralization dosing device 3 can not only mix and react with the ballast water in the discharge pipeline 2 in the pipeline, but can also be further mixed by the discharge pump 6, thereby improving the neutralization reaction rate.

[0061] The chemical dosing control method for a ship ballast water residual chlorine neutralization system provided in this invention determines the maximum and minimum dosing flow rates of the neutralizing agent, Qmax and Qmin, based on the retention time T of the ballast water in ballast tank 1. After unloading begins, the maximum dosing flow rate Qmax is initially used. Simultaneously, the current residual chlorine concentration X is detected and compared with a set value to determine the neutralization effect. The dosing flow rate of the neutralizing agent is adjusted accordingly. This allows the ship's ballast water residual chlorine neutralization system to dosing based on the actual amount of neutralizing agent required during unloading, significantly reducing the amount of neutralizing agent used while ensuring the neutralization effect and avoiding waste. Furthermore, by setting a minimum dosing flow rate Qmin, when the neutralizing agent dosing flow rate decreases to less than or equal to the minimum dosing flow rate Qmin, the minimum dosing flow rate Qmin is maintained. This reduces the amount of neutralizing agent used and avoids frequent system fluctuations, thus contributing to system stability.

[0062] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for controlling the dosing of chemicals in a ship's ballast water residual chlorine neutralization system, the system comprising a ballast tank and a discharge pipeline, the discharge pipeline being connected to the ballast tank, characterized in that, The dosing control method includes: S10: Obtain the retention time T of the ballast water in the ballast tank; S20: Based on the ballast water retention time T, calculate the dynamic standard dosing flow rate Q, maximum dosing flow rate Qmax, and minimum dosing flow rate Qmin of the neutralizing agent; where Q=a*T^(-b), a is the dosing coefficient, and b is the dynamic correction factor; Qmax=c*Q, Qmin=d*Q, c is a control coefficient greater than 1, and d is a control coefficient less than 1; S30: After the discharge begins, add neutralizing agent into the discharge pipeline at the maximum dosing flow rate Qmax; S40: Detect the current residual chlorine concentration X of the neutralized ballast water in the discharge pipeline, and compare the current residual chlorine concentration X with a set value; if the current residual chlorine concentration X is greater than the set value, increase the flow rate of the neutralizing agent; if the current residual chlorine concentration X is less than or equal to the set value, decrease the flow rate of the neutralizing agent, and when the flow rate of the neutralizing agent decreases to less than or equal to the minimum flow rate Qmin, maintain the minimum flow rate Qmin for dosing; wherein, the increase or decrease in the flow rate of the neutralizing agent each time does not exceed 20% of the previous flow rate; S50: Repeat step S40 above until the loading is completed; S60: Obtain the actual maximum dosing flow rate Q1 and the actual minimum dosing flow rate Q2 of the neutralizing agent during the discharge process; after the discharge is completed, update the database based on the actual maximum dosing flow rate Q1, the actual minimum dosing flow rate Q2 and the ballast water retention time T during this discharge process, and refit the equation of the dynamic standard dosing flow rate Q to correct the dosing coefficient a and the dynamic correction factor b; no upper limit is set for the actual maximum dosing flow rate Q1 of the neutralizing agent during the discharge process.

2. The dosing control method for the residual chlorine neutralization system of ship ballast water as described in claim 1, characterized in that, In step S40 above, while maintaining the minimum dosing flow rate Qmin, the current residual chlorine concentration X is continuously monitored. If the current residual chlorine concentration X is less than or equal to the set value, the dosing continues at the minimum dosing flow rate Qmin; if the current residual chlorine concentration X is greater than the set value, the dosing flow rate of the neutralizing agent is increased.

3. The dosing control method for the residual chlorine neutralization system of ship ballast water as described in claim 1, characterized in that, In step S40 above, the amount of increase or decrease in the flow rate of the neutralizing agent each time is 10% of the previous flow rate.

4. The dosing control method for the residual chlorine neutralization system of ship ballast water as described in claim 1, characterized in that, The control coefficient c ranges from 1.1 to 1.

5.

5. The dosing control method for the residual chlorine neutralization system of ship ballast water as described in claim 1, characterized in that, The control coefficient d ranges from 0.6 to 0.

9.

6. A controller, characterized in that, include: A memory, wherein instructions are stored; The processor, when the instructions are executed by the processor, implements the dosing control method for the residual chlorine neutralization system of ship ballast water as described in any one of claims 1 to 5.

7. A residual chlorine neutralization system for ship ballast water, characterized in that, Including the controller as described in claim 6, the ship ballast water residual chlorine neutralization system further includes a ballast tank, a discharge pipeline, a neutralization dosing device, a residual chlorine detection device, and a timer; the discharge pipeline is connected to the ballast tank, and the neutralization dosing device and the residual chlorine detection device are sequentially connected to the discharge pipeline; the neutralization dosing device is used to add neutralizing agent to the discharge pipeline, the residual chlorine detection device is used to detect the residual chlorine concentration of the neutralized ballast water in the discharge pipeline, and the timer is used to record the retention time of the ballast water in the ballast tank; The timer, the neutralization dosing device, and the residual chlorine detection device are all electrically connected to the controller. The controller is used to control the neutralization dosing device to dosing chemicals based on the ballast water retention time recorded by the timer and the residual chlorine concentration detected by the residual chlorine detection device.

8. The ship ballast water residual chlorine neutralization system as described in claim 7, characterized in that, The neutralization dosing device includes a neutralizing agent storage tank, a dosing pipeline, and a dosing pump. One end of the dosing pipeline is connected to the neutralizing agent storage tank, and the other end of the dosing pipeline is connected to the discharge pipeline. The dosing pump is installed on the dosing pipeline and is a variable frequency pump. The dosing pump is electrically connected to the controller.

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