Marine engine exhaust gas recirculation system, water treatment system and method

Abstract

The present application relates to the technical field of ship engine water treatment, and discloses a ship engine exhaust gas recirculation system, a water treatment system and method, and a water treatment system of the ship engine exhaust gas recirculation system, which comprises a water treatment device, a circulating cabin, a wetting cabin, a zero-emission cabin and a controller; the circulating cabin is connected with the water treatment device through a first pipeline, a flow meter and an adjusting valve are arranged on the first pipeline, the wetting cabin is connected with the water treatment device through a second pipeline and a main pipeline in sequence, a water quality monitor is arranged on the main pipeline, the wetting cabin is provided with a liquid level detector, the second pipeline and the main pipeline are connected through a first three-way valve, and the zero-emission cabin is connected with the first three-way valve through a third pipeline; and the controller is electrically connected with the flow meter, the adjusting valve, the water quality monitor, the liquid level detector and the first three-way valve respectively. The water treatment system of the present application distributes the treated wastewater meeting the standard from the water treatment device to the circulating cabin and the wetting cabin for repeated use, thereby improving the utilization rate of water resources.

Description

Technical Field

[0001] This invention relates to the field of marine engine water treatment technology, specifically to marine engine exhaust gas recirculation systems, water treatment systems, and methods. Background Technology

[0002] With increasingly stringent regulations from the International Maritime Organization (IMO) on ship air pollutant emissions and the widespread adoption of liquefied natural gas (LNG) as a clean marine fuel, intelligent exhaust gas recirculation (iCER) technology has become a core component of new marine dual-fuel low-speed diesel engines. The iCER system combines NO... X With its dual functions of high-efficiency emission reduction and LNG ship boil-off gas (BOG) reuse, it enables ship engines to meet the relevant regulations of the International Maritime Organization regarding NOx emissions without the need for additional after-treatment devices such as selective catalytic reduction (SCR). X Emission requirements have led to their widespread application in the new generation of ocean-going vessels.

[0003] The iCER system mainly consists of two parts: an Exhaust Gas Cooling (EGC) system and a water treatment system. The EGC system uses a cooling tower spray scrubbing method to cool and purify a portion of the high-temperature exhaust gas from the marine engine. The treated, low-temperature exhaust gas is then introduced into the front of the turbocharger of the marine engine, mixed with fresh air in a specific ratio, and then enters the cylinder for combustion. By precisely controlling the oxygen concentration in the scavenging gas, the iCER system can significantly improve the in-cylinder combustion process, effectively avoiding abnormal combustion phenomena such as pre-ignition and detonation that are prone to occur in gas combustion mode. This allows the marine engine to use a higher compression ratio, further improving fuel economy and power performance.

[0004] The process of exhaust gas scrubbing easily generates a large amount of oily wastewater. When the cooling tower sprays and cools the high-temperature exhaust gas, it washes away unburned fuel oil, lubricating oil, and acidic oxides produced by combustion, forming highly corrosive acidic oily wastewater. According to relevant requirements, the oil content in wastewater discharged from ships must not exceed 15 ppm, therefore, a water treatment system must be installed to purify the oily wastewater.

[0005] Existing water treatment systems often discharge oily wastewater directly overboard after purifying it to meet standards, resulting in low water resource utilization efficiency. Summary of the Invention

[0006] This invention provides a marine engine exhaust gas recirculation system, a water treatment system, and a method to solve the problem of water waste caused by the direct discharge of treated wastewater from the water treatment system of the marine engine exhaust gas recirculation system.

[0007] In a first aspect, the present invention provides a water treatment system for a marine engine exhaust gas recirculation system, comprising: Water treatment equipment for receiving and treating wastewater generated by the ship's engine exhaust gas recirculation system; The circulation chamber is connected to the outlet of the water treatment device via a first pipeline. The first pipeline is equipped with a flow meter and a regulating valve. The circulation chamber is used to mix the wastewater treated by the water treatment device with the wastewater generated by the ship engine exhaust gas recirculation system before sending it back into the water treatment device. The wetting chamber is connected to the outlet of the water treatment device via a second pipeline and a main pipeline in sequence. A water quality monitor is installed on the main pipeline, and a liquid level detector is installed in the wetting chamber. The second pipeline is connected to the main pipeline via a first three-way valve. The wetting chamber is used to send the treated wastewater into the air cooler of the ship engine exhaust gas recirculation system to wet and clean the air cooler. The zero-emission chamber is connected to the first three-way valve via a third pipeline. The zero-emission chamber is used to temporarily store and discharge treated wastewater. The controller is electrically connected to the flow meter, the regulating valve, the water quality monitor, the liquid level detector, and the first three-way valve, respectively. The controller is configured to control the opening of the regulating valve based on the relationship between the flow data detected by the flow meter and a preset flow threshold, so as to regulate the flow rate of wastewater input to the circulation chamber and maintain the liquid level of the circulation chamber within a preset liquid level range; and is configured to control the first three-way valve to connect the main pipeline and the second pipeline when the water quality data detected by the water quality monitor meets a preset condition and the liquid level of the wetting chamber detected by the liquid level detector meets a preset liquid level condition.

[0008] Beneficial effects: The water treatment system of the marine engine exhaust gas recirculation system of the present invention uses a water treatment device to receive and treat the wastewater generated by the marine engine exhaust gas recirculation system, and divides the treated qualified wastewater into three streams so that the clean qualified wastewater can be reused, thereby improving the utilization rate of water resources and reducing the cost of use.

[0009] The first pipeline introduces clean wastewater into the circulation chamber, which also receives untreated wastewater from the ship's engine exhaust gas recirculation system. The treated clean wastewater improves the quality of the untreated wastewater before it is introduced into the water treatment unit, enhancing its operational stability and processing efficiency. A flow meter and regulating valve are installed on the first pipeline to control the flow rate of wastewater entering the circulation chamber, thus maintaining the liquid level within the chamber within a suitable range.

[0010] The second route involves feeding clean wastewater into the wetting tank through the main pipeline and the second pipeline when the water quality data detected by the water quality monitor meets the preset conditions and the liquid level detected by the liquid level detector meets the preset liquid level conditions. This is used to wet and clean the air cooler, reducing the risk of scaling and corrosion of the air cooler, and also reducing the pressure on the ship's freshwater supply.

[0011] The third route involves sending clean wastewater into the zero-discharge chamber via the main pipeline and the third pipeline when the water quality data detected by the water quality monitor does not meet the preset conditions or the liquid level detected by the liquid level detector does not meet the preset liquid level conditions. The treated wastewater is then temporarily stored and discharged through the zero-discharge chamber.

[0012] In one optional embodiment, a second three-way valve is provided on the main pipeline, which divides the main pipeline into a first branch and a second branch. The first branch is connected to the water treatment device, and an oil separator is provided at the outlet of the water treatment device. The second branch is connected to the first pipeline and the first three-way valve, respectively, and the water quality monitor is located on the second branch. The controller is also electrically connected to the oil separator and the second three-way valve, and in response to the oil content detected by the oil separator being lower than a preset oil threshold, controls the second three-way valve to connect the first branch and the second branch.

[0013] Beneficial effects: By setting up a second three-way valve and an oil separator, the oil content of the wastewater is detected after the water treatment device has treated the wastewater, so that the output wastewater with oil content that meets the discharge standards can be ensured. This avoids non-compliant wastewater from entering the circulation chamber and wetting chamber, which could contaminate subsequent equipment, and also avoids the discharge of non-compliant wastewater that could cause environmental pollution.

[0014] In one alternative implementation, it further includes: The vent chamber is connected to the second three-way valve via the fourth pipeline, and the outlet of the vent chamber is connected to the inlet of the water treatment device via the ninth pipeline. The controller also controls the second three-way valve to connect the first branch and the fourth pipeline when the oil content detected by the oil separator is higher than the preset oil threshold.

[0015] Beneficial effects: By setting up a venting chamber connected to the second three-way valve and connecting the outlet of the venting chamber to the inlet of the water treatment device, wastewater that does not meet the discharge standards can be temporarily stored in the venting chamber and then reprocessed in the water treatment device, which further improves the utilization rate of water resources.

[0016] In one alternative implementation, the overflow port of the circulation chamber is connected to the inlet of the venting chamber via a sixth pipeline.

[0017] Beneficial effects: When the water volume in the circulation chamber is too large, the wastewater is sent to the discharge chamber for temporary storage through the overflow port of the circulation chamber and the sixth pipeline, and then sent to the water treatment device for secondary use.

[0018] In one alternative implementation, it further includes: A third three-way valve is installed on the third pipeline and divides the third pipeline into a third branch and a fourth branch. The third branch is connected to the first three-way valve, and the fourth branch is connected to the zero-emission cabin. The fifth pipeline has its inlet connected to the third three-way valve and its outlet connected to the outside of the ship's hull.

[0019] Beneficial effects: By installing a third three-way valve on the third pipeline, the treated clean wastewater can be discharged to the zero-emission tank for temporary storage or directly discharged overboard as needed, which improves the flexibility of wastewater discharge, avoids the risk of illegal discharge in the zero-emission area, and can be directly discharged overboard in the permitted discharge area, reducing the storage pressure in the zero-emission tank.

[0020] In one optional embodiment, the inlet of the circulation chamber is connected to the outlet of the spray system of the ship engine exhaust gas recirculation system via a seventh pipeline. The circulation chamber is used to receive wastewater generated by the spray system and mix it with the wastewater treated by the water treatment device before returning it to the water treatment device.

[0021] Beneficial effects: Wastewater from the spray system is temporarily stored in the circulation chamber. The water treatment device continuously replenishes the circulation chamber with treated clean wastewater, improving the water quality in the circulation chamber. The improved wastewater in the circulation chamber is then returned to the water treatment device, facilitating the recycling of wastewater from the spray system and improving the operational stability and treatment efficiency of the water treatment device.

[0022] In one alternative embodiment, the outlet of the circulation chamber is connected to the inlet of the spray system via an eighth pipeline, and the circulation chamber is also used to input the mixed wastewater into the spray system.

[0023] Beneficial effects: The circulation chamber and the spray system form an independent water circulation loop. Wastewater from the spray system is sent to the circulation chamber after use. The water treatment device continuously replenishes the circulation chamber with treated clean wastewater, improving the water quality of the wastewater in the circulation chamber. The circulation chamber then inputs the improved wastewater back into the spray system for reuse, thereby further improving the utilization rate of water resources.

[0024] Secondly, the present invention also provides a marine engine exhaust gas recirculation system, comprising: Sprinkler system and air cooler; The water treatment system of the aforementioned marine engine exhaust gas recirculation system has its inlet connected to both the spray system and the air cooler.

[0025] Beneficial effects: Since the marine engine exhaust gas recirculation system includes a water treatment system for the marine engine exhaust gas recirculation system, it has the same effect as the water treatment system for the marine engine exhaust gas recirculation system, and will not be repeated here.

[0026] Thirdly, the present invention also provides a water treatment method for a marine engine exhaust gas recirculation system, wherein the water treatment system employing the above-mentioned marine engine exhaust gas recirculation system includes: Wastewater generated by the ship's engine exhaust gas recirculation system is received and treated using a water treatment device; The wastewater treated by the water treatment device is distributed into three streams. The first stream is sent to the circulation chamber through the first pipeline. In the circulation chamber, the wastewater treated by the water treatment device is mixed with the wastewater generated by the ship engine exhaust gas recirculation system before being sent back to the water treatment device. During the process of the wastewater being sent into the circulation chamber, the flow rate data of the first pipeline is obtained by a flow meter. Based on the relationship between the flow rate data and a preset flow rate threshold, the opening degree of the regulating valve on the first pipeline is determined. The second stream is sent to the wetting chamber through the main pipeline and the second pipeline. In the wetting chamber, the treated wastewater is sent to the air cooler of the ship engine exhaust gas recirculation system to wet and clean the air cooler. The third stream is sent to the zero-emission chamber through the main pipeline and the third pipeline. In the zero-emission chamber, the treated wastewater is temporarily stored and discharged. The water quality data of the wastewater treated by the water treatment device is obtained by a water quality monitor, and the liquid level of the wetting chamber is obtained by a liquid level detector. When the water quality data meets the preset conditions and the liquid level in the wetting chamber meets the preset liquid level conditions, the first three-way valve is controlled to connect the main pipeline and the second pipeline to perform the allocation of the first and second pipelines; or, when the water quality data does not meet the preset qualification conditions or the liquid level in the wetting chamber does not meet the preset liquid level conditions, the first three-way valve is controlled to connect the main pipeline and the third pipeline to perform the allocation of the first and third pipelines.

[0027] Beneficial Effects: The water treatment method for the marine engine exhaust gas recirculation system of the present invention utilizes a water treatment device to receive and treat the wastewater generated by the marine engine exhaust gas recirculation system. The treated, compliant wastewater is divided into three streams for reuse, improving water resource utilization and reducing operating costs. The first stream involves inputting clean wastewater into the circulation chamber via a first pipeline. The circulation chamber can also connect to wastewater from the spray system. The treated clean wastewater improves the water quality of the spray system's wastewater before being input into the spray system and the water treatment device, improving the operational stability and treatment efficiency of the water treatment device and further enhancing water resource utilization. A flow meter and regulating valve are installed on the first pipeline to control the flow rate of wastewater entering the circulation chamber, maintaining the liquid level within the circulation chamber within a suitable range. The second route involves sending clean wastewater into the wetting tank via the main pipeline and the second pipeline when the water quality data detected by the water quality monitor meets the preset conditions and the liquid level in the wetting tank detected by the level detector meets the preset liquid level conditions. This clean water is used to wet and clean the air cooler, reducing the risk of scaling and corrosion, and also reducing the pressure on the ship's freshwater supply. The third route involves sending clean wastewater into the zero-discharge tank via the main pipeline and the third pipeline when the water quality data detected by the water quality monitor does not meet the preset conditions or the liquid level in the wetting tank detected by the level detector does not meet the preset liquid level conditions. The treated wastewater is then temporarily stored and discharged through the zero-discharge tank.

[0028] In one optional implementation, determining the opening degree of the regulating valve on the first pipeline based on the relationship between the flow data and a preset flow threshold includes: A preset flow range is obtained, which is based on a preset flow threshold, wherein the magnitude of the preset flow threshold is positively correlated with the power of the ship's engine; In response to the flow rate data being lower than the lower limit of the preset flow rate range, the opening of the regulating valve is increased; In response to the flow rate data being higher than the upper limit of the preset flow rate range, the opening of the regulating valve is reduced.

[0029] Beneficial effects: The interval flow regulation method avoids frequent operation of the regulating valve. By setting a preset flow range, the valve opening is adjusted when the flow data exceeds the preset flow range, reducing the number of times the regulating valve operates, extending the service life of the regulating valve, and effectively filtering out small fluctuations in flow measurement, avoiding frequent system oscillations, and improving the stability and reliability of flow control.

[0030] Moreover, the preset flow threshold is positively correlated with the power of the ship's engine. It can automatically adjust the return water volume of the circulation tank according to the changes in water production under different loads of the ship's engine, accurately control the liquid level of the circulation tank, and adapt to the fluctuations in water production of the ship's engine under different operating conditions. Attached Figure Description

[0031] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is a first schematic diagram of a water treatment system for a marine engine exhaust gas recirculation system according to an embodiment of the present invention; Figure 2 This is a second schematic diagram of a water treatment system for a marine engine exhaust gas recirculation system according to an embodiment of the present invention.

[0033] Explanation of reference numerals in the attached figures: 1. Water treatment unit; 2. Circulation chamber; 3. First pipeline; 4. Flow meter; 5. Regulating valve; 6. Wetting chamber; 601. Liquid level detector; 7. Second pipeline; 8. Main pipeline; 801. First branch pipeline; 802. Second branch pipeline; 9. Water quality monitor; 10. First three-way valve; 11. Zero discharge chamber; 12. Third pipeline; 1201. Third branch pipeline; 1202. Fourth branch pipeline; 13. Second three-way valve; 14. Tenth pipeline; 15. Venting chamber; 16. Fourth pipeline; 17. Third three-way valve; 18. Fifth pipeline; 19. Sixth pipeline; 20. Seventh pipeline; 21. Eighth pipeline; 22. Spray system; 23. Air cooler; 24. Pressure regulating valve; 25. Ninth pipeline. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] The iCER system mainly consists of two parts: an exhaust gas cooling system (EGC) and a water treatment system. During operation, the exhaust gas cooling system generates acidic oily wastewater. In existing technologies, the oily wastewater is treated by the water treatment system to reduce the oil content to below 15 ppm before being discharged directly, resulting in low water resource utilization.

[0036] In addition, the air coolers of the iCER system require continuous wetting and cleaning with clean fresh water to prevent salt crystallization and fouling from affecting heat exchange efficiency. Existing air coolers rely on the ship's onboard freshwater production system or a stored freshwater supply, significantly increasing the operating load on the freshwater production unit and the pressure on the ship's freshwater reserves. This is especially problematic for long-haul ocean-going vessels, potentially impacting the crew's domestic water needs and the normal water requirements of other critical equipment.

[0037] The following is combined with Figures 1 to 2 The following describes embodiments of the present invention.

[0038] According to an embodiment of the present invention, in one aspect, referring to Figure 1 A water treatment system for a marine engine exhaust gas recirculation system is provided, which mainly includes: a water treatment device 1, a circulation chamber 2, a wetting chamber 6, a zero-emission chamber 11, and a controller (not shown in the figure). It is used to treat oily wastewater generated during the operation of the marine engine exhaust gas recirculation system (iCER) and to distribute and reuse the treated clean wastewater to improve the utilization rate of water resources.

[0039] Water treatment unit 1 is used to receive and treat wastewater generated by the ship's engine exhaust gas recirculation system. Specifically, refer to... Figure 2 Wastewater generated by the ship's engine exhaust gas recirculation system is sent into the vent tank 15, where the inlet of the water treatment device 1 draws in the wastewater for treatment. The water treatment device 1 can treat the oil content in the wastewater using methods such as air flotation, filtration, and membrane separation. Understandably, the water treatment device 1 can also perform other treatments on the wastewater as needed, such as adjusting the pH value and filtering impurities. Furthermore, the water treatment device 1 can also selectively receive and treat wastewater generated by other components of the ship's engine exhaust gas recirculation system as needed.

[0040] The circulation chamber 2 is connected to the outlet of the water treatment device 1 via the first pipe 3. A flow meter 4 and a regulating valve 5 are sequentially installed on the first pipe 3 along the flow direction of the wastewater. The flow meter 4 is used to detect the wastewater flow rate in the first pipe 3, and the regulating valve 5 is used to regulate the wastewater flow rate in the first pipe 3. The circulation chamber 2 is used to mix the wastewater treated by the water treatment device 1 with the wastewater generated by the ship's engine exhaust gas recirculation system before sending it back into the water treatment device 1.

[0041] The inlet of the wetting chamber 6 is connected to the outlet of the water treatment device 1 via the second pipe 7 and the main pipe 8. A water quality monitor 9 is installed on the main pipe 8 to detect the water quality data of the wastewater in the main pipe 8, including turbidity and conductivity. The wetting chamber 6 is equipped with a level detector 601 to detect the liquid level within the wetting chamber 6. The second pipe 7 is connected to the main pipe 8 via a first three-way valve 10. The wetting chamber 6 is used to send the treated wastewater into the air cooler 23 of the ship's engine exhaust gas recirculation system to wet and clean the air cooler 23. Specifically, refer to... Figure 2 The outlet of the wetting chamber 6 is connected to the inlet of the air cooler 23 via the tenth pipe 14.

[0042] The zero-emission chamber 11 is connected to the first three-way valve 10 via the third pipeline 12. The zero-emission chamber 11 is used to temporarily store and discharge treated wastewater to avoid pollution caused by direct discharge of wastewater.

[0043] The controller is electrically connected to the flow meter 4, the regulating valve 5, the water quality monitor 9, the liquid level detector 601, and the first three-way valve 10.

[0044] The controller is configured to control the opening of the regulating valve 5 based on the relationship between the flow data detected by the flow meter 4 and a preset flow threshold, thereby regulating the wastewater flow rate into the circulation chamber 2 to maintain the liquid level in the circulation chamber 2 within a preset liquid level range. It is also configured to control the first three-way valve 10 to connect the main pipeline 8 and the second pipeline 7 in response to the water quality data detected by the water quality monitor 9 meeting preset conditions and the liquid level in the wetting chamber 6 detected by the liquid level detector 601 meeting preset liquid level conditions. The wetting chamber 6 has a preset liquid level threshold; when the liquid level in the wetting chamber 6 is lower than the preset liquid level threshold, the preset liquid level condition is met.

[0045] The water treatment system of the ship engine exhaust gas recirculation system provided in this embodiment of the invention uses water treatment device 1 to receive and treat the wastewater generated by the ship engine exhaust gas recirculation system, and divides the treated qualified wastewater into three streams so that the clean qualified wastewater can be reused, thereby improving the utilization rate of water resources, reducing the cost of use, and improving the operational reliability of the water treatment system.

[0046] In the first route, clean wastewater is fed into the circulation chamber 2 via the first pipeline 3. The circulation chamber 2 also receives untreated wastewater from the ship's engine exhaust gas recirculation system. The treated clean wastewater improves the quality of the untreated wastewater before it is fed into the water treatment device 1, thus enhancing the operational stability and treatment efficiency of the water treatment device 1. A flow meter 4 and a regulating valve 5 are installed on the first pipeline 3 to control the flow rate of wastewater entering the circulation chamber 2, thereby maintaining the liquid level within the circulation chamber 2 within a suitable range.

[0047] In the second route, when the water quality data detected by the water quality monitor 9 meets the preset conditions and the liquid level of the wetting tank 6 detected by the liquid level detector 601 meets the preset liquid level conditions, clean wastewater is input into the wetting tank 6 through the main pipeline 8 and the second pipeline 7 to wet and clean the air cooler 23, reducing the risk of scaling and corrosion of the air cooler 23, and also reducing the pressure on the ship's freshwater supply.

[0048] The third route involves sending clean wastewater into the zero-discharge chamber 11 via the main pipeline 8 and the third pipeline 12 when the water quality data detected by the water quality monitor 9 does not meet the preset conditions or the liquid level in the wetting chamber 6 detected by the liquid level detector 601 does not meet the preset liquid level conditions. The treated wastewater is then temporarily stored and discharged through the zero-discharge chamber 11. Of course, the main pipeline 8 and the third pipeline 12 can always be kept unobstructed so that when the wastewater flow rate is large, it can be discharged into the zero-discharge chamber 11.

[0049] Specifically, the preset flow threshold can be set according to the power of the ship's engine and the climate. When the power of the ship's engine is high or the climate is humid, the water production is large, and the preset flow threshold can be reduced. When the power of the ship's engine is low or the climate is dry, the water production is small, and the preset flow threshold can be increased, thereby ensuring that the liquid level in the circulation tank 2 is maintained within a suitable range.

[0050] For example, the preset flow threshold is P1, the power of the ship's engine is P2, and P1 = P2 × R, where R is the return water rate.

[0051] When the ship's engine power P2 is low, or when the climate is dry, R is 50 L / MWh.

[0052] When the ship's engine power P2 is at medium power, or under normal weather conditions, R is 100 L / MWh.

[0053] When the ship's engine power P2 is at high power, or under normal humidity conditions, R is 150 L / MWh.

[0054] When the flow rate detected by flow meter 4 is lower than the preset flow rate threshold P1, the opening of regulating valve 5 is increased until the flow rate is greater than the preset flow rate threshold P1.

[0055] When the flow rate detected by flow meter 4 is higher than 120% of the preset flow rate threshold P1, the opening of regulating valve 5 is reduced until the flow rate is less than 120% of the preset flow rate threshold P1.

[0056] When the flow data detected by the flow meter 4 is between the preset flow threshold P1 and 120% of the preset flow threshold P1, the opening of the control valve 5 remains unchanged.

[0057] It should be noted that the embodiments of the present invention do not limit the specific structure of the flow meter 4, regulating valve 5, water quality monitor 9, and liquid level detector 601, and any existing structure can be selected as needed.

[0058] For example, the flow meter 4 can be an electromagnetic flow meter, the regulating valve 5 can be an electromagnetic regulating valve, and the water quality monitor 9 can integrate a turbidity sensor and a conductivity sensor. The turbidity sensor has a range of 0 NTU-50 NTU and is used to detect the particulate matter content in wastewater; the conductivity sensor has a range of 0 μS / cm-2000 μS / cm, with an alarm value set at 750 μS / cm, and is used to indirectly reflect the salt and ion content in the water. When the detected turbidity is within the range and the conductivity does not exceed the alarm value, the preset conditions are met. When the turbidity exceeds the range or the conductivity exceeds the alarm value, the preset conditions are not met. The level detector 601 can be a float-type level sensor.

[0059] It should be noted that the controller can be any existing controller as needed. For example, the controller can be a microcontroller unit (MCU), a central processing unit (CPU), an electronic control unit (ECU), or other existing controllers. Of course, other conventional controllers can also be selected as needed. This embodiment of the invention does not impose any limitations on this.

[0060] In one embodiment, refer to Figure 2 The main pipeline 8 is equipped with a second three-way valve 13, which divides the main pipeline 8 into a first branch 801 and a second branch 802. The first branch 801 is connected to the outlet of the water treatment device 1, and an oil separator is installed at the outlet of the water treatment device 1 to detect the oil content of the wastewater treated by the water treatment device 1. The oil separator can be integrated into the water treatment device 1. The second branch 802 is connected to the first pipeline 3 and the first three-way valve 10, and a water quality monitor 9 is installed on the second branch 802.

[0061] The controller is also electrically connected to the oil separator and the second three-way valve 13 respectively, and in response to the oil content detected by the oil separator being lower than the preset oil content threshold, it controls the second three-way valve 13 to connect the first branch 801 and the second branch 802.

[0062] By setting a second three-way valve 13 and an oil separator, the oil content of the wastewater is detected after the wastewater is treated by the water treatment device 1, so that the wastewater with an oil content that meets the discharge standards can be output. This avoids the wastewater that does not meet the standards from entering the circulation chamber 2 and the wetting chamber 6, which would contaminate subsequent equipment, and also avoids the discharge of wastewater that does not meet the standards, which would cause environmental pollution.

[0063] Specifically, the preset oil content threshold can be selected and set as needed. For example, the preset oil content threshold adopts the general emission standard of 15 ppm. When the oil content detected by the oil separator is less than 15 ppm, it indicates that the oil content of the wastewater has been treated to a qualified standard. The second three-way valve 13 is then controlled to connect the first branch 801 and the second branch 802 to distribute the treated clean wastewater. Alternatively, an infrared oil analyzer can be selected as the oil separator.

[0064] Furthermore, referring to Figure 2 The second branch 802 can also be equipped with a pressure regulating valve 24, which is connected in parallel with the water quality monitor 9 to regulate the water pressure entering the water quality monitor 9 so as to detect water quality data.

[0065] In one embodiment, reference Figure 2 The water treatment system of the ship's engine exhaust gas recirculation system also includes a venting chamber 15. The venting chamber 15 is connected to the second three-way valve 13 via a fourth pipe 16, and the outlet of the venting chamber 15 is connected to the inlet of the water treatment device 1 via a ninth pipe 25. The venting chamber 15 is used to temporarily store wastewater, and the water treatment device 1 draws wastewater from the venting chamber 15 for treatment by driving a pump.

[0066] The controller also controls the second three-way valve 13 to connect the first branch 801 and the fourth pipeline 16 when the oil content detected by the oil separator is higher than the preset oil content threshold.

[0067] By setting up a venting chamber 15 connected to the second three-way valve 13 and connecting the outlet of the venting chamber 15 to the inlet of the water treatment device 1, wastewater that does not meet the discharge standards can be temporarily stored in the venting chamber 15 and then reprocessed in the water treatment device 1, thereby further improving the utilization rate of water resources.

[0068] Furthermore, in one embodiment, reference is made to... Figure 2 The overflow port of the circulation chamber 2 is connected to the inlet of the discharge chamber 15 through the sixth pipe 19. When the water volume in the circulation chamber 2 is too large, the wastewater is sent to the discharge chamber 15 for temporary storage through the overflow port of the circulation chamber 2 and the sixth pipe 19, and then sent to the water treatment device 1 for secondary use.

[0069] Furthermore, in one embodiment, reference is made to... Figure 2 The outlet of the air cooler 23 is connected to the venting chamber 15. The wastewater generated by the air cooler 23 is first sent into the venting chamber 15, and the water treatment device 1 extracts the wastewater from the venting chamber 15 for treatment.

[0070] Of course, in some other embodiments, wastewater generated by other subsystems of the ship engine exhaust gas recirculation system can also be first sent into the venting chamber 15, and the water treatment device 1 can extract the wastewater from the venting chamber 15 for treatment.

[0071] In one embodiment, refer to Figure 2 The water treatment system of the ship's engine exhaust gas recirculation system also includes a third three-way valve 17 and a fifth pipeline 18. The third three-way valve 17 is located on the third pipeline 12 and divides the third pipeline 12 into a third branch 1201 and a fourth branch 1202. The third branch 1201 is connected to the first three-way valve 10, and the fourth branch 1202 is connected to the zero-emission compartment 11. The inlet of the fifth pipeline 18 is connected to the third three-way valve 17, and the outlet of the fifth pipeline 18 is connected to the outside of the ship's hull.

[0072] Furthermore, the controller is also connected to the third three-way valve 17. When the ship is sailing in a zero-emission area such as the emission control zone, the controller controls the third three-way valve 17 to connect the third branch 1201 and the fourth branch 1202, sending the wastewater into the zero-emission tank 11 for temporary storage. After the ship leaves the zero-emission area, the wastewater temporarily stored in the zero-emission tank 11 can be discharged to the outside of the ship via the discharge pump.

[0073] When the ship is sailing in a non-emission control area, the controller controls the third three-way valve 17 to connect the third branch 1201 and the fifth pipeline 18, so that the wastewater is discharged directly to the outside of the ship.

[0074] By installing a third three-way valve 17 on the third pipeline 12, the treated clean wastewater can be discharged to the zero-emission tank 11 for temporary storage or directly discharged overboard as needed, which improves the flexibility of wastewater discharge, avoids the risk of illegal discharge in the zero-emission area, and can be directly discharged overboard in the permitted discharge area, reducing the storage pressure of the zero-emission tank 11.

[0075] It should be noted that the embodiments of the present invention do not limit the specific structure of the first three-way valve 10, the second three-way valve 13, and the third three-way valve 17, and any existing structure can be selected as needed. For example, the first three-way valve 10, the second three-way valve 13, and the third three-way valve 17 can all be electric three-way ball valves.

[0076] In one embodiment, refer to Figure 2 The inlet of the circulation chamber 2 is connected to the outlet of the spray system 22 of the ship's engine exhaust gas recirculation system via the seventh pipe 20. The circulation chamber 2 is used to receive wastewater generated by the spray system 22 and mix it with the wastewater treated by the water treatment device 1 before returning it to the water treatment device 1. The wastewater after the spray system 22 is used is sent to the circulation chamber 2 for temporary storage. The water treatment device 1 continuously replenishes the circulation chamber 2 with treated clean wastewater to improve the wastewater quality in the circulation chamber 2. The improved wastewater in the circulation chamber 2 is then returned to the water treatment device 1, which facilitates the recycling of wastewater from the spray system 22 and also helps to improve the operational stability and treatment efficiency of the water treatment device 1.

[0077] Furthermore, in one embodiment, reference is made to... Figure 2The outlet of the circulation chamber 2 is connected to the inlet of the spray system 22 via the eighth pipe 21. The circulation chamber 2 is also used to input the mixed wastewater into the spray system 22. The circulation chamber 2 and the spray system 22 form an independent water circulation loop. Wastewater from the spray system 22 is sent into the circulation chamber 2 after use. The water treatment device 1 continuously replenishes the circulation chamber 2 with treated clean wastewater, improving the wastewater quality in the circulation chamber 2. The circulation chamber 2 then inputs the improved wastewater back into the spray system 22 for recycling, thereby further improving the utilization rate of water resources.

[0078] Specifically, the circulation tank 2 first receives the waste liquid from the spray system 22 and the clean waste liquid from the water treatment device 1, mixes the two, and then inputs the mixed wastewater into the spray system 22 through the eighth pipeline 21. The spray system 22 uses the mixed wastewater to spray and cool the exhaust gas of the ship's engine.

[0079] As time goes on, the amount of water vapor in the ship's engine exhaust gas condenses into liquid water, causing the liquid level in the circulation tank 2 to rise continuously. Once it reaches the overflow level, it overflows through the overflow port into the venting tank 15, where it is extracted by the water treatment device for secondary treatment.

[0080] Furthermore, the wastewater generated by the spray system 22 can have two paths: one path enters the circulation chamber 2, and the other path enters the water treatment device 1. Alternatively, the wastewater generated by the spray system 22 can directly enter the circulation chamber 2, mix with the treated clean wastewater, and then be temporarily stored in the discharge chamber 15. The wastewater is then pumped from the discharge chamber 15 to the water treatment device 1 by a drive pump, and the mixed wastewater is reintroduced into the spray system 22.

[0081] Understandably, the circulating tank 2 can also pump the mixed wastewater through a circulating pump and cool it with seawater before sending it into the spray system 22 to meet the usage requirements of the spray system 22.

[0082] In addition, the water treatment system of the ship engine exhaust gas recirculation system can also be equipped with other conventional components as needed, such as switching valves on the corresponding pipelines. The specific settings can be selected according to actual needs, and the embodiments of the present invention do not impose too many restrictions.

[0083] Application scenarios: During the operation of the ship's engine exhaust gas recirculation system, the oily wastewater generated by the spray system 22 spraying and cooling the exhaust gas is sent to the circulation chamber 2, and the excess wastewater in the circulation chamber 2 overflows into the vent chamber 15. The wastewater generated from cleaning and wetting the air cooler 23 is also sent to the vent chamber 15. The water treatment device 1 extracts wastewater from the vent chamber 15 and purifies it to remove oil, particulate matter, and acidic substances. The wastewater treated by the water treatment device 1 is first tested for oil content in real time by an oil separator.

[0084] When the oil content exceeds 15 ppm, the controller activates the second three-way valve 13 to connect the first branch 801 and the fourth pipeline 16, sending the wastewater into the discharge chamber 15 for storage. The wastewater in the discharge chamber 15 is then returned to the water treatment device 1 for secondary treatment via the ninth pipeline 25.

[0085] When the oil content is lower than the preset oil threshold (15ppm in this embodiment), the controller controls the second three-way valve 13 to connect the first branch 801 and the second branch 802, and sends the wastewater that meets the oil discharge standard into the second branch 802 for distribution.

[0086] The clean and compliant wastewater from the second branch 802 is partially transported to the circulation chamber 2 via the first pipeline 3. The flow meter 4 monitors the flow data of the first pipeline 3 in real time and transmits the flow data to the controller. The controller adjusts the opening of the flow regulating valve 5 according to the relationship between the flow data and the preset flow threshold to maintain the liquid level in the circulation chamber 2 within the preset liquid level range.

[0087] The specific flow regulation logic is as follows: A preset flow range is obtained based on a preset flow threshold. In this embodiment, the preset flow range is 100%-120% of the preset flow threshold. The preset flow threshold is determined based on the power of the ship's engine or weather conditions.

[0088] When the detected flow rate is lower than the preset flow rate threshold, the opening of the regulating valve 5 is increased until the flow rate is greater than or equal to the preset flow rate threshold.

[0089] When the detected flow rate is higher than 120% of the preset flow rate threshold, reduce the opening of the regulating valve 5 until the flow rate is less than or equal to 120% of the preset flow rate threshold.

[0090] When the flow rate is within the preset flow rate range, the opening of the regulating valve 5 remains unchanged.

[0091] Clean wastewater entering the circulation chamber 2 is mixed with untreated wastewater generated by the spray system 22. The mixed wastewater is cooled by seawater and then transported to the spray system 22 through the eighth pipeline 21 to spray and cool the exhaust gas.

[0092] When the liquid level in the circulation chamber 2 exceeds the overflow threshold, the excess wastewater overflows through the sixth pipe 19 to the discharge chamber 15, and then flows back to the water treatment device 1 through the discharge chamber 15, forming a circulation loop.

[0093] The water quality monitor 9 on the second branch 802 monitors water quality data in real time, including turbidity and conductivity. The controller receives water quality data signals from the water quality monitor 9 and liquid level signals from the liquid level detector 601 in real time.

[0094] When the water quality data meets the preset conditions (turbidity not exceeding the range and conductivity ≤ 750 μS / cm) and the liquid level in the wetting chamber 6 is lower than the preset liquid level threshold, the controller controls the first three-way valve 10 to connect the second branch 802 and the second pipeline 7, sending qualified clean wastewater into the wetting chamber 6. The wetting chamber 6 then sends the clean wastewater into the air cooler 23 through the tenth pipeline 14 to wet and clean the air cooler 23. At this time, the first three-way valve 10 can choose whether to connect the second branch 802 and the third pipeline 12 as needed, sending wastewater into the third pipeline 12.

[0095] When the water quality data does not meet the preset conditions, or when the liquid level in the wetting chamber 6 is higher than the preset liquid level threshold (the wetting chamber 6 is full of clean and qualified wastewater), the controller controls the first three-way valve 10 to connect the second branch 802 and the third pipeline 12, sending the wastewater into the third pipeline 12. At this time, the first three-way valve 10 closes the second branch 802 and the second pipeline 7 to prevent unqualified wastewater from being sent into the wetting chamber 6.

[0096] The qualified produced water supplied to the third pipeline 12 is diverted according to the emission regulations of the ship's navigation area: when the ship is navigating in a zero-emission zone such as an emission control zone, the controller controls the third three-way valve 17 to connect the third branch 1201 and the fourth branch 1202, sending the wastewater into the zero-emission tank 11 for temporary storage. After the ship leaves the zero-emission zone, the wastewater temporarily stored in the zero-emission tank 11 can be discharged overboard via the discharge pump.

[0097] When the ship is sailing in a non-emission control area, the controller controls the third three-way valve 17 to connect the third branch 1201 and the fifth pipeline 18, so that the wastewater is discharged directly to the outside of the ship.

[0098] According to an embodiment of the present invention, another aspect provides a marine engine exhaust gas recirculation system, comprising: a spray system 22, an air cooler 23, and a water treatment system for the marine engine exhaust gas recirculation system, wherein the inlet of the water treatment device 1 is connected to the spray system 22 and the air cooler 23 respectively.

[0099] Since the exhaust gas recirculation system of a ship's engine includes a water treatment system for the exhaust gas recirculation system, which has the same effect as the water treatment system for the exhaust gas recirculation system of a ship's engine, it will not be elaborated on here.

[0100] According to an embodiment of the present invention, in another aspect, a water treatment method for a marine engine exhaust gas recirculation system is also provided, wherein the water treatment system employing the above-described marine engine exhaust gas recirculation system includes: S100. Wastewater generated by the ship's engine exhaust gas recirculation system is received and treated using water treatment device 1.

[0101] S200. The wastewater treated by the water treatment device 1 is divided into three streams. The first stream is sent to the circulation chamber 2 through the first pipeline 3. The circulation chamber 2 mixes the wastewater treated by the water treatment device 1 with the wastewater generated by the ship engine exhaust gas recirculation system before sending it back to the water treatment device 1. During the process of sending the wastewater into the circulation chamber 2, the flow rate data of the first pipeline 3 is obtained by the flow meter 4. Based on the relationship between the flow rate data and the preset flow rate threshold, the opening degree of the regulating valve 5 on the first pipeline 3 is determined. The second stream is sent to the wetting chamber 6 through the main pipeline 8 and the second pipeline. The wetting chamber 6 sends the treated wastewater to the air cooler 23 of the ship engine exhaust gas recirculation system to wet and clean the air cooler 23. The third stream is sent to the zero emission chamber 11 through the main pipeline 8 and the third pipeline 12. The zero emission chamber 11 is used to temporarily store and discharge the treated wastewater.

[0102] S300: Obtain water quality data of the wastewater treated by the water treatment device 1 through the water quality monitor 9, and obtain the liquid level of the wetting chamber 6 through the liquid level detector 601.

[0103] S400: In response to the water quality data meeting preset conditions and the liquid level of the wetting chamber 6 meeting preset liquid level conditions, control the first three-way valve 10 to connect the main pipeline 8 and the second pipeline 7, and perform the allocation of the first and second pipelines; or, in response to the water quality data not meeting preset qualification conditions, or the liquid level of the wetting chamber 6 not meeting preset liquid level conditions, control the first three-way valve 10 to connect the main pipeline 8 and the third pipeline 12, and perform the allocation of the first and third pipelines.

[0104] The water treatment method for a marine engine exhaust gas recirculation system provided in this embodiment of the invention utilizes a water treatment device 1 to receive and treat wastewater generated by the marine engine exhaust gas recirculation system. The treated clean wastewater is divided into three streams for reuse, improving water resource utilization and reducing operating costs. The first stream involves inputting clean wastewater into a circulation chamber 2 via a first pipeline 3. The circulation chamber 2 can also be connected to wastewater from a spray system 22. The treated clean wastewater improves the water quality of the wastewater from the spray system 22 before being input into the spray system 22 and the water treatment device 1, improving the operational stability and treatment efficiency of the water treatment device 1 and further enhancing water resource utilization. A flow meter 4 and a regulating valve 5 are installed on the first pipeline 3 to control the flow rate of wastewater entering the circulation chamber 2, thereby maintaining the liquid level within the circulation chamber 2 within a suitable range. The second route involves sending clean wastewater into the wetting tank 6 via the main pipeline 8 and the second pipeline 7 when the water quality data detected by the water quality monitor 9 meets the preset conditions and the liquid level in the wetting tank 6 detected by the liquid level detector 601 meets the preset liquid level conditions. This is used to wet and clean the air cooler 23, reducing the risk of scaling and corrosion in the air cooler 23 and also reducing the pressure on the ship's freshwater supply. The third route involves sending clean wastewater into the zero-discharge tank 11 via the main pipeline 8 and the third pipeline 12 when the water quality data detected by the water quality monitor 9 does not meet the preset conditions or the liquid level in the wetting tank 6 detected by the liquid level detector 601 does not meet the preset liquid level conditions. This is done by temporarily storing and discharging the treated wastewater in the zero-discharge tank 11.

[0105] In one embodiment, in step S200, determining the opening degree of the regulating valve 5 on the first pipeline 3 based on the relationship between the flow data and a preset flow threshold includes: S210. Obtain a preset flow range, which is based on a preset flow threshold, wherein the magnitude of the preset flow threshold is positively correlated with the power of the ship's engine.

[0106] S220, In response to the flow data being lower than the lower limit of the preset flow range, increase the opening of the regulating valve 5.

[0107] S230, in response to the flow data being higher than the upper limit of the preset flow range, reduce the opening of the regulating valve 5.

[0108] By adopting a range-based flow regulation method, frequent operation of the regulating valve 5 is avoided. By setting a preset flow range, when the flow data exceeds the preset flow range, the opening of the regulating valve 5 is reduced, thus reducing the number of times the regulating valve 5 operates, extending the service life of the regulating valve 5, and effectively filtering out small fluctuations in flow measurement, avoiding frequent system oscillations, and improving the stability and reliability of flow control.

[0109] Moreover, the preset flow threshold is positively correlated with the power of the ship engine. It can automatically adjust the return water volume of the circulation tank 2 according to the changes in water production under different loads of the ship engine, accurately control the liquid level of the circulation tank 2, and adapt to the fluctuations in water production under different operating conditions of the ship engine.

[0110] For example, the preset traffic range is 100%-120% of the preset traffic threshold P1.

[0111] When the flow rate detected by flow meter 4 is lower than the preset flow rate threshold P1, the opening of regulating valve 5 is increased until the flow rate is greater than the preset flow rate threshold P1.

[0112] When the flow rate detected by flow meter 4 is higher than 120% of the preset flow rate threshold P1, the opening of regulating valve 5 is reduced until the flow rate is less than 120% of the preset flow rate threshold P1.

[0113] When the flow data detected by the flow meter 4 is between the preset flow threshold P1 and 120% of the preset flow threshold P1, the opening of the control valve 5 remains unchanged.

[0114] In addition, the preset flow threshold is P1, the power of the ship's engine is P2, and P1 = P2 × R, where R is the return water rate.

[0115] When the ship's engine power P2 is low, or when the climate is dry, R is 50 L / MWh.

[0116] When the ship's engine power P2 is at medium power, or under normal weather conditions, R is 100 L / MWh.

[0117] When the ship's engine power P2 is at high power, or under normal humidity conditions, R is 150 L / MWh.

[0118] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A water treatment system for a marine engine exhaust gas recirculation system, characterized in that, include: Water treatment device (1) is used to receive and treat wastewater generated by the ship engine exhaust gas recirculation system; The circulation chamber (2) is connected to the outlet of the water treatment device (1) through the first pipeline (3). The first pipeline (3) is equipped with a flow meter (4) and a regulating valve (5). The circulation chamber (2) is used to mix the wastewater treated by the water treatment device (1) with the wastewater generated by the ship engine exhaust gas recirculation system and then send it into the water treatment device (1). The wetting chamber (6) is connected to the outlet of the water treatment device (1) in sequence through the second pipeline (7) and the main pipeline (8). The main pipeline (8) is equipped with a water quality monitor (9), and the wetting chamber (6) is equipped with a liquid level detector (601). The second pipeline (7) and the main pipeline (8) are connected through the first three-way valve (10). The wetting chamber (6) is used to send the treated wastewater into the air cooler (23) of the ship engine exhaust gas recirculation system to wet and clean the air cooler (23). The zero-emission chamber (11) is connected to the first three-way valve (10) via a third pipeline (12). The zero-emission chamber (11) is used to temporarily store and discharge treated wastewater. The controller is electrically connected to the flow meter (4), the regulating valve (5), the water quality monitor (9), the liquid level detector (601), and the first three-way valve (10), respectively. The controller is configured to control the opening of the regulating valve (5) based on the relationship between the flow data detected by the flow meter (4) and the preset flow threshold, so as to regulate the flow rate of wastewater input to the circulation chamber (2) and maintain the liquid level of the circulation chamber (2) within the preset liquid level range; and is configured to control the first three-way valve (10) to connect the main pipeline (8) and the second pipeline (7) when the water quality data detected by the water quality monitor (9) meets the preset conditions and the liquid level of the wetting chamber (6) detected by the liquid level detector (601) meets the preset liquid level conditions.

2. The water treatment system of the marine engine exhaust gas recirculation system according to claim 1, characterized in that, The main pipeline (8) is provided with a second three-way valve (13), which divides the main pipeline (8) into a first branch (801) and a second branch (802). The first branch (801) is connected to the water treatment device (1), and an oil separator is provided at the outlet of the water treatment device (1). The second branch (802) is connected to the first pipeline (3) and the first three-way valve (10) respectively. The water quality monitor (9) is located on the second branch (802). The controller is also electrically connected to the oil separator and the second three-way valve (13), and in response to the oil content detected by the oil separator being lower than the preset oil threshold, controls the second three-way valve (13) to connect the first branch (801) and the second branch (802).

3. The water treatment system of the marine engine exhaust gas recirculation system according to claim 2, characterized in that, Also includes: The vent chamber (15) is connected to the second three-way valve (13) via the fourth pipe (16), and the outlet of the vent chamber (15) is connected to the inlet of the water treatment device (1) via the ninth pipe (25). The controller also controls the second three-way valve (13) to connect the first branch (801) and the fourth pipeline (16) when the oil content detected by the oil separator is higher than the preset oil threshold.

4. The water treatment system of the marine engine exhaust gas recirculation system according to claim 3, characterized in that, The overflow port of the circulation chamber (2) is connected to the inlet of the venting chamber (15) via the sixth pipe (19).

5. The water treatment system of the marine engine exhaust gas recirculation system according to claim 2, characterized in that, Also includes: The third three-way valve (17) is installed on the third pipeline (12) and divides the third pipeline (12) into a third branch (1201) and a fourth branch (1202). The third branch (1201) is connected to the first three-way valve (10), and the fourth branch (1202) is connected to the zero-emission cabin (11). The fifth pipeline (18) has its inlet connected to the third three-way valve (17) and its outlet connected to the outside of the ship.

6. The water treatment system of the marine engine exhaust gas recirculation system according to any one of claims 1 to 5, characterized in that, The inlet of the circulation chamber (2) is connected to the outlet of the spray system (22) of the ship engine exhaust gas recirculation system through the seventh pipeline (20). The circulation chamber (2) is used to receive the wastewater generated by the spray system (22) and mix it with the wastewater treated by the water treatment device (1) before returning it to the water treatment device (1).

7. The water treatment system of the marine engine exhaust gas recirculation system according to claim 6, characterized in that, The outlet of the circulation chamber (2) is connected to the inlet of the spray system (22) via the eighth pipe (21). The circulation chamber (2) is also used to input the mixed wastewater into the spray system (22).

8. A marine engine exhaust gas recirculation system, characterized in that, include: Sprinkler system (22) and air cooler (23); The water treatment system of the marine engine exhaust gas recirculation system according to any one of claims 1 to 7, wherein the inlet of the water treatment device (1) is connected to the spray system (22) and the air cooler (23) respectively.

9. A water treatment method for a marine engine exhaust gas recirculation system, characterized in that, A water treatment system employing the marine engine exhaust gas recirculation system according to any one of claims 1 to 7, comprising: Wastewater generated by the ship's engine exhaust gas recirculation system is received and treated using a water treatment device (1); The wastewater treated by the water treatment device (1) is divided into three routes. The first route is sent to the circulation chamber (2) through the first pipeline (3). The circulation chamber (2) is used to mix the wastewater treated by the water treatment device (1) with the wastewater generated by the ship engine exhaust gas recirculation system before sending it back to the water treatment device (1). During the process of sending the wastewater into the circulation chamber (2), the flow data of the first pipeline (3) is obtained by the flow meter (4). Based on the relationship between the flow data and the preset flow threshold, the opening degree of the regulating valve (5) on the first pipeline (3) is determined. The second route is sent to the wetting chamber (6) through the main pipeline (8) and the second pipeline (7). The wetting chamber (6) is used to send the treated wastewater into the air cooler (23) of the ship engine exhaust gas recirculation system to wet and clean the air cooler (23). The third route is sent to the zero emission chamber (11) through the main pipeline (8) and the third pipeline (12). The zero emission chamber (11) is used to temporarily store and discharge the treated wastewater. The water quality data of the wastewater treated by the water treatment device (1) is obtained by the water quality monitor (9), and the liquid level of the wetting chamber (6) is obtained by the liquid level detector (601). When the water quality data meets the preset conditions and the liquid level of the wetting chamber (6) meets the preset liquid level conditions, the first three-way valve (10) is controlled to connect the main pipeline (8) and the second pipeline (7) to perform the allocation of the first and second pipelines; or, when the water quality data does not meet the preset qualified conditions, or the liquid level of the wetting chamber (6) does not meet the preset liquid level conditions, the first three-way valve (10) is controlled to connect the main pipeline (8) and the third pipeline (12) to perform the allocation of the first and third pipelines.

10. The water treatment method for a marine engine exhaust gas recirculation system according to claim 9, characterized in that, The determination of the opening degree of the regulating valve (5) on the first pipeline (3) based on the relationship between the flow data and the preset flow threshold includes: A preset flow range is obtained, which is based on a preset flow threshold, wherein the magnitude of the preset flow threshold is positively correlated with the power of the ship's engine; In response to the flow rate data being lower than the lower limit of the preset flow rate range, the opening of the regulating valve (5) is increased; In response to the flow rate data being higher than the upper limit of the preset flow rate range, the opening of the regulating valve (5) is reduced.

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