Ship ballast water treatment and online aeration mixed residual chlorine neutralization system and method

Abstract

The invention provides a ship ballast water treatment and online aeration mixed residual chlorine neutralization system and method. The system comprises a filter unit, a primary mixing unit, an aeration unit, a secondary mixing unit and a residual chlorine detection device, the sea chest is respectively communicated with or disconnected from one end of the filtering unit and one end of the secondary mixing unit through a manual valve; the other end of the filtering unit is communicated with or disconnected from one end of the primary mixing unit through a remote control valve; the other end of the first-stage mixing unit is respectively communicated with the aeration unit and the other end of the second-stage mixing unit, the other end of the second-stage mixing unit is respectively communicated with the residual chlorine detection device and the ballast tank, and the other end of the second-stage mixing unit is communicated with or disconnected from the outboard discharge port through a manual valve; according to the ship ballast water treatment and on-line aeration mixed residual chlorine neutralization system and method, the configuration of the neutralization system can be simplified, real-time agent configuration is achieved, the accuracy of the agent configuration amount is improved, and the problem of agent waste caused by a pre-configuration mode is avoided.

Description

Technical Field

[0001] This invention relates to the field of marine environmental engineering technology, and more specifically, to a system and method for treating ship ballast water and neutralizing residual chlorine through online aeration. Background Technology

[0002] In the process of treating ship ballast water using the branch-channel electrolysis method, the electrolyzer electrolyzes seawater to produce sodium hypochlorite solution, which is then injected into the main pipeline to inactivate microorganisms in the seawater. However, a certain amount of residual chlorine remains in the seawater during biological fire suppression. During unloading operations, neutralizing agents need to be added to ensure the residual chlorine remains within the range required by the classification society. Currently, the system uses a pre-mixed neutralization tank for adding chemicals. The chemicals need to be prepared in advance and injected via metering pumps, making the system design complex and leading to the problem of over-mixing chemicals. Furthermore, since the chemicals have a limited shelf life after preparation, the pre-mixing method also results in significant waste. Therefore, researching how to simplify the neutralization system configuration, achieve real-time chemical mixing, improve the accuracy of chemical mixing, and avoid the waste caused by pre-mixing is of great significance.

[0003] Patent CN102491569A mentions a ship ballast water treatment system, including a sea valve, a seawater coarse filter, a ballast water pump, a seawater fine filter, and a ballast tank. The sea valve connects to the ballast tank via the seawater coarse filter, the ballast water pump, a mechanical filter, a microfiltration membrane filter, and the seawater fine filter. Nitrogen is supplied to the seawater by a nitrogen generator through a nitrogen-water mixer. This system can separate and treat microorganisms and organisms, including sediments, in the ballast water, thereby inhibiting the growth of residual microorganisms and bacteria and meeting strict discharge standards. However, the neutralization method used in this system is unrelated to the addition of chemicals, and therefore, it cannot improve the accuracy of the chemical dosage. Summary of the Invention

[0004] In view of this, the present invention aims to propose a system and method for treating ship ballast water and neutralizing residual chlorine through online aeration, in order to solve the problems of existing systems that use pre-configured neutralization tanks for chemical dosing. This requires pre-preparation of chemicals and their addition via metering pumps, making the system design complex and prone to over-dosing. Furthermore, the pre-configuration method results in significant waste of chemicals due to their limited shelf life. The present invention aims to simplify the configuration of the neutralization system, enable real-time chemical dosing, improve the accuracy of chemical dosing, and avoid the waste caused by pre-configuration.

[0005] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0006] This invention relates to a ship ballast water treatment and online aeration mixing residual chlorine neutralization system and method. The ship ballast water treatment and online aeration mixing residual chlorine neutralization system includes a filtration unit, a primary mixing unit, an aeration unit, a secondary mixing unit, and a residual chlorine detection device. The seagate is connected to or shut off one end of the filtration unit and the secondary mixing unit via manual valves. The other end of the filtration unit is connected to or shut off one end of the primary mixing unit via a remote control valve. The other end of the primary mixing unit is connected to the other end of the aeration unit and the other end of the secondary mixing unit. The other end of the secondary mixing unit is connected to the residual chlorine detection device and the ballast tank. The other end of the secondary mixing unit is connected to or shut off the discharge port via a manual valve.

[0007] Furthermore, at least one manual valve and one remote control valve are provided.

[0008] Furthermore, the filtration unit includes a booster pump and a filter; one end of the booster pump is connected to or shut off from the sea gate via a manual valve, the other end of the booster pump is connected to or shut off from one end of the filter, and the other end of the filter is connected to or shut off from the primary mixing unit via a remote control valve.

[0009] Furthermore, the system also includes a check valve to prevent backflow; the check valve includes a first check valve; the first check valve is located between the booster pump and the filter.

[0010] Furthermore, the check valve is a manually operated shut-off check valve.

[0011] Furthermore, the primary mixing unit includes an electrolysis device, a dosing pump, and an injector; one end of the electrolysis device is connected to or shut off one end of the injector via the dosing pump and a remote control valve in sequence; the other end of the electrolysis device is connected to or shut off the other end of the filter unit and the injector via a remote control valve and a manual valve in turn; the other end of the injector is connected to or shut off the aeration unit.

[0012] Furthermore, the aeration unit includes a compressed air source, a neutralizing agent storage device, and an aeration mixer; the compressed air source and the neutralizing agent storage device are both connected to one end of the aeration mixer, and the other end of the aeration mixer is connected to the injector of the primary mixing unit through a check valve.

[0013] Furthermore, the compressed gas source is generally compressed nitrogen or compressed air.

[0014] Furthermore, the secondary mixing unit includes a ballast pump; the manual valves include a manual three-valve and a manual four-valve; one end of the ballast pump is connected to or shut off from the seagate via the manual three-valve, and the other end of the ballast pump is connected to the residual chlorine detection device, the ballast tank, the discharge port, and one end of the manual four-valve, respectively; the other end of the manual four-valve is located between the manual three-valve and the ballast pump.

[0015] A method for treating ship ballast water and neutralizing residual chlorine through online aeration, the method being applied to a ship ballast water treatment and online aeration system for neutralizing residual chlorine through online aeration, the method comprising the following steps:

[0016] Step 1: Start the booster pump: Use the booster pump to fill the ejector with seawater and run it.

[0017] Step 2, reagent mixing: First, the reagents are initially mixed by starting the compressed air source, and then the reagents are mixed evenly with seawater;

[0018] Step 3: Neutralize residual chlorine in seawater;

[0019] Step 4: Detection and Judgment.

[0020] Compared with existing technologies, the ship ballast water treatment and online aeration mixed residual chlorine neutralization system and method described in this invention have the following beneficial effects:

[0021] By setting up the system, the configuration of the neutralization system can be effectively simplified, real-time reagent preparation can be achieved, the accuracy of reagent preparation can be improved, and the waste of reagents caused by pre-preparation methods can be avoided. By setting up the method, the operation of the neutralization process can be simplified, the efficiency of neutralization can be improved, the waste of neutralizing reagents can be reduced, and the stability of the neutralization system can be improved. Attached Figure Description

[0022] The accompanying drawings, which constitute a part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0023] Figure 1 This is a schematic diagram of the overall system structure.

[0024] Explanation of reference numerals in the attached drawings: 1. Filtration unit; 11. Booster pump; 12. Filter; 2. Primary mixing unit; 21. Electrolysis device; 22. Dosing pump; 23. Injector; 3. Aeration unit; 31. Compressed air source; 32. Neutralizing agent storage device; 33. Aeration mixer; 4. Secondary mixing unit; 41. Ballast pump; 5. Residual chlorine detection device; 6. Subsea gate; 7. Ballast tank; 8. Outboard discharge port; 9. Manual valve; 91. Manual valve 1; 92. Manual valve 2; 93. Manual valve 3; 94. Manual valve 4; 95. Manual valve 5; 96. Manual valve 6; 10. Remote control valve; 101. Remote control valve 1; 102. Remote control valve 2; 20. Check valve; 201. Check valve 1; 202. Check valve 2; 203. Check valve 3. Detailed Implementation

[0025] The inventive concepts of this disclosure will be described below using terminology commonly used by those skilled in the art to communicate the essence of their work to others skilled in the art. However, these inventive concepts may be embodied in many different forms and should not be construed as limited to the embodiments described herein.

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0027] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] To address the current technology's use of pre-configured neutralization tanks for chemical dosing, which requires advance preparation of chemicals and metering pump injection, complicating system design and leading to over-preparation and waste due to the limited shelf life of the chemicals, this embodiment proposes a ship ballast water treatment and online aeration mixed residual chlorine neutralization system and method. The system includes a filtration unit 1, a primary mixing unit 2, an aeration unit 3, a secondary mixing unit 4, and a residual chlorine detection device 5. A seagate 6 is connected to or disconnected from one end of the filtration unit 1 and the secondary mixing unit 4 via manual valves 9. The other end of the filtration unit 1 is connected to or disconnected from one end of the primary mixing unit 2 via a remote control valve 10. The other end of the primary mixing unit 2 is connected to the other ends of the aeration unit 3 and the secondary mixing unit 4. The other end of the secondary mixing unit 4 is connected to the residual chlorine detection device 5 and the ballast tank 7, and is also connected to or disconnected from the outer discharge port 8 via manual valve 9. At least one manual valve 9 and one remote control valve 10 are provided. The number of manual valves 9 and remote control valves 10 is selected according to the requirements.

[0029] Unlike existing neutralization methods that require neutralization tanks, metering pumps, and related accessories, this application, through the configuration of each unit within the system and the coordinated configuration of the residual chlorine detection device 5, can achieve real-time reagent preparation to a great extent while simplifying system configuration. Furthermore, the configuration of a two-stage mixing unit improves the system's efficiency in neutralizing residual chlorine. The aeration mixing method also eliminates the need for neutralization tanks, metering pumps, and related accessories, simplifying system configuration and resulting in a more streamlined system design. During the discharge process, the system prepares reagents in real time according to reagent consumption requirements, avoiding waste caused by pre-preparation and reducing reagent consumption during system application.

[0030] The filtration unit 1 includes a booster pump 11 and a filter 12. One end of the booster pump 11 is connected to or shut off from the seagate 6 via a manual valve 9, and the other end of the booster pump 11 is connected to or shut off from one end of the filter 12. The other end of the filter 12 is connected to or shut off from the primary mixing unit 2 via a remote control valve 10. The system also includes a check valve 20 to prevent backflow. The check valve 20 includes a check valve 201. The check valve 201 is located between the booster pump 11 and the filter 12 to prevent seawater backflow. In this embodiment, the check valve 201 is a manually operated shut-off check valve, allowing for manual shut-off of the seawater. The remote control valve 10 includes a remote control valve 101, located between the filter 12 and the primary mixing unit 2. The manual valve 9 includes a manual valve 91, located between the seagate 6 and the booster pump 11.

[0031] By combining the booster pump 11, filter 12, manual valve 9, and remote control valve 10, the seawater entering through the seabed gate 6 can be initially filtered, thus filtering and preventing clogging of the ship's ballast water obtained by each unit in the subsequent system, thereby ensuring the reliability and stability of the system operation.

[0032] The primary mixing unit 2 includes an electrolysis device 21, a dosing pump 22, and an injector 23. One end of the electrolysis device 21 is connected to or disconnected from one end of the injector 23 via the dosing pump 22 and a remote control valve 10. The other end of the electrolysis device 21 is connected to or disconnected from the other end of the filter unit 1 and the injector 23 via the remote control valve 10 and a manual valve 9. The other end of the injector 23 is connected to or disconnected from the aeration unit 3. The remote control valve 10 also includes a remote control secondary valve 102, which is located between the dosing pump 22 and the injector 23 to control the flow direction of the electrolyzed water containing the neutralizing agent as needed. The manual valve 9 also includes a manual secondary valve 92, which is located between the electrolysis device 21 and the injector 23.

[0033] By setting up the components within the primary mixing unit 2, the system's neutralization efficiency can be enhanced, and the accuracy of real-time drug configuration can be improved, thus avoiding the problem of over-configuration of drugs.

[0034] Aeration unit 3 includes a compressed air source 31, a neutralizing agent storage device 32, and an aeration mixer 33. The compressed air source 31 and the neutralizing agent storage device 32 are both connected to one end of the aeration mixer 33, and the other end of the aeration mixer 33 is connected to the injector 23 of the primary mixing unit 2 via a check valve 20. The check valve 20 further includes a secondary check valve 202, which is located between the aeration mixer 33 and the injector 23. The compressed air source 31 is generally compressed nitrogen or compressed air.

[0035] The components within aeration unit 3 are designed to store and pump in neutralizing agents as needed. The check valve 202 prevents backflow after the neutralizing agent is pumped into the injector 23 by the compressed air source 31, thus improving the operational stability and safety of aeration unit 3. Furthermore, aeration mixing achieves primary uniform mixing of the gas and agent phases, and the booster pump 11 drives water to fully mix the gas-solid and liquid phases, enabling real-time agent preparation and avoiding agent waste caused by pre-mixing methods.

[0036] The secondary mixing unit 4 includes a ballast pump 41; the manual valve 9 includes a manual three-valve 93 and a manual four-valve 94. One end of the ballast pump 41 is connected to or shut off the seagate 6 via the manual three-valve 93, and the other end of the ballast pump 41 is connected to the residual chlorine detection device 5, the ballast tank 7, the outboard discharge port 8, and one end of the manual four-valve 94. The other end of the manual four-valve 94 is located between the manual three-valve 93 and the ballast pump 41. In addition, the manual valve 9 also includes a manual five-valve 95, which is located between the ejector 23 and the residual chlorine detection device 5.

[0037] The configuration of ballast pump 41, manual three-valve 93, and manual four-valve 94 enables precise detection of residual chlorine in water treatment, allowing for dynamic adjustment of the reagent ratio based on the residual chlorine level. This improves the neutralization efficiency of the residual chlorine neutralization system, avoids reagent waste caused by pre-mixing, and prevents cavitation of ballast pump 41 by locating both the main management neutralization dosing point and the sodium hypochlorite dosing point downstream of ballast pump 41. Furthermore, the water pressure downstream of this dosing point allows for direct venting of gases mixed in with the seawater to the outer outlet, simplifying the system structure, reducing system costs, improving the purity of the discharged water, and minimizing environmental pollution.

[0038] The manual valve 9 also includes a manual six-valve 96, and the check valve 20 also includes a check three-valve 203; one end of the manual six-valve 96 is connected to the end of the residual chlorine detection device 5 toward the ballast pump 41 through the check three-valve 203; the other end of the manual six-valve 96 is connected to or shut off the output end of the injector 23.

[0039] The adjacent arrangement of the manual six-valve 96 and the check three-valve 203 can prevent the backflow of seawater in the ballast tank 7 and facilitate the dynamic control of the amount of chemicals added, thereby optimizing the accuracy of system control.

[0040] A method for treating ship ballast water and neutralizing residual chlorine through online aeration, the method being applied to a ship ballast water treatment and online aeration system for neutralizing residual chlorine through online aeration, the method comprising the following steps:

[0041] Step 1: Start the booster pump 11: Before starting the system unloading process, the booster pump 11 must be started to drive seawater into the ejector 23; the booster pump 11 fills the ejector 23 with seawater and makes it run.

[0042] Step 2, reagent mixing: First, the reagent is initially mixed by starting the compressed air source 31, and then the reagent is evenly mixed with seawater.

[0043] Step 3, Neutralizing residual chlorine in seawater: The mixed neutralizing solution is added to the main pipeline of the ballast water system through different check valves 20 to neutralize the residual chlorine in the seawater;

[0044] Step 4, Detection and Judgment: The ballast water treatment system is started to enter the ballast process. During ballast, the residual chlorine detection device 5 monitors the residual chlorine concentration C of the seawater in real time during the discharge process. It determines whether the currently detected residual chlorine value C ≤ C0 ± a. If yes, the residual chlorine value in the current seawater is qualified, and the seawater is discharged to the discharge port 8. If no, the residual chlorine value in the current seawater is unqualified. The main controller in the system processes the real-time residual chlorine data detected by the residual chlorine detection device 5 and interlocks with the remote control valve 101 to control the amount of chemical dosing, thereby realizing the system's on-demand chemical dosing treatment. Step 4 is repeated. Here, C0 is the preset value for qualified residual chlorine value in the seawater to be discharged, and a is the deviation value of the residual chlorine value. The specific values ​​of C0 and a are set according to requirements.

[0045] By setting the method described above, the neutralization process can be simplified, neutralization efficiency improved, neutralization agent waste reduced, and the stability of the neutralization system enhanced. Furthermore, by setting step four, the remote-controlled valve 101 can be dynamically adjusted to minimize neutralization agent consumption during system operation.

[0046] Step two includes:

[0047] Step S21: Initial mixing of the agent: First, start the compressed air source 31, and then start the aeration mixer 33 at the maximum dosage. The compressed air source 31 drives the aeration mixer 33 to draw in the powdered neutralizing agent in the neutralizing agent storage device 32 to achieve uniform mixing of the air and solid phases.

[0048] Step S22: Uniform mixing of agent and seawater: After the booster pump 11 drives the seawater into the injector 23, it draws in the gas-solid mixture from the aeration mixer 33 to achieve uniform mixing of agent and seawater.

[0049] By coordinating steps one and two, crystallization can be avoided when the gas-solid mixture is directly injected into the injector 23, which would otherwise affect the neutralization efficiency of residual chlorine in the seawater. Injecting the gas-solid mixture after the booster pump 11 has been activated in step one to operate the injector 23 in a seawater-filled environment effectively improves the operational reliability of the neutralization system and increases its neutralization efficiency.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A ship ballast water treatment and online aeration mixed residual chlorine neutralization system, characterized in that, It includes a filter unit (1), a primary mixing unit (2), an aeration unit (3), a secondary mixing unit (4), and a residual chlorine detection device (5); the sea gate (6) is connected to or shut off one end of the filter unit (1) and the secondary mixing unit (4) through a manual valve (9); the other end of the filter unit (1) is connected to or shut off one end of the primary mixing unit (2) through a remote control valve (10); the other end of the primary mixing unit (2) is connected to the other end of the aeration unit (3) and the secondary mixing unit (4), the other end of the secondary mixing unit (4) is connected to the residual chlorine detection device (5) and the ballast tank (7), and the other end of the secondary mixing unit (4) is connected to or shut off the discharge port (8) through a manual valve (9).

2. The ship ballast water treatment and online aeration mixed residual chlorine neutralization system according to claim 1, characterized in that, At least one manual valve (9) and one remote control valve (10) are provided.

3. The ship ballast water treatment and online aeration mixed residual chlorine neutralization system according to claim 1, characterized in that, The filter unit (1) includes a booster pump (11) and a filter (12); one end of the booster pump (11) is connected to or shut off the sea gate (6) through a manual valve (9), the other end of the booster pump (11) is connected to or shut off one end of the filter (12), and the other end of the filter (12) is connected to or shut off the primary mixing unit (2) through a remote control valve (10).

4. The ship ballast water treatment and online aeration mixing residual chlorine neutralization system according to claim 3, characterized in that, The system also includes a check valve (20) for preventing backflow; the check valve (20) includes a check valve (201); the check valve (201) is located between the booster pump (11) and the filter (12).

5. The ship ballast water treatment and online aeration mixed residual chlorine neutralization system according to claim 4, characterized in that, The check valve (201) is a manually operated shut-off check valve.

6. The ship ballast water treatment and online aeration mixed residual chlorine neutralization system according to claim 1, characterized in that, The primary mixing unit (2) includes an electrolysis device (21), a dosing pump (22), and an injector (23). One end of the electrolysis device (21) is connected to or disconnected from one end of the injector (23) via the dosing pump (22) and a remote control valve (10). The other end of the electrolysis device (21) is connected to or disconnected from the other end of the filter unit (1) and the injector (23) via the remote control valve (10) and a manual valve (9). The other end of the injector (23) is connected to or disconnected from the aeration unit (3).

7. The ship ballast water treatment and online aeration mixed residual chlorine neutralization system according to claim 1, characterized in that, The aeration unit (3) includes a compressed air source (31), a neutralizing agent storage device (32), and an aeration mixer (33); the compressed air source (31) and the neutralizing agent storage device (32) are both connected to one end of the aeration mixer (33), and the other end of the aeration mixer (33) is connected to the injector (23) of the primary mixing unit (2) through a check valve (20).

8. The ship ballast water treatment and online aeration mixed residual chlorine neutralization system according to claim 7, characterized in that, The compressed gas source (31) is generally compressed nitrogen or compressed air.

9. A ship ballast water treatment and online aeration mixed residual chlorine neutralization system according to claim 1, characterized in that, The secondary mixing unit (4) includes a ballast pump (41); the manual valve (9) includes a manual three-valve (93) and a manual four-valve (94); one end of the ballast pump (41) is connected to or shut off the sea gate (6) through the manual three-valve (93), and the other end of the ballast pump (41) is connected to the residual chlorine detection device (5), the ballast tank (7), the discharge port (8), and one end of the manual four-valve (94), respectively. The other end of the manual four-valve (94) is located between the manual three-valve (93) and the ballast pump (41).

10. A method for treating ship ballast water and neutralizing residual chlorine through online aeration, characterized in that, The method is applied to a ship ballast water treatment and online aeration mixed residual chlorine neutralization system according to any one of claims 1-9, and the method includes the following steps: Step 1: Start the booster pump (11): Use the booster pump (11) to fill the ejector (23) with seawater and run it. Step 2, reagent mixing: First, the reagent is initially mixed by starting the compressed air source (31), and then the reagent is mixed evenly with seawater; Step 3: Neutralize residual chlorine in seawater; Step 4: Detection and Judgment.

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