Flue gas washing water treatment structure and method for dual-fuel main engine of ship

Abstract

The invention relates to the technical field of ship washing water treatment, and particularly discloses a ship dual-fuel main engine flue gas washing water treatment structure and method.The ship dual-fuel main engine flue gas washing water treatment structure comprises a treatment box, a washing water feeding assembly, a sludge discharging assembly, a floating oil fishing-out assembly and a clear water filtering and discharging assembly; the sludge discharging assembly is arranged at the lower end of the treatment box, the floating oil fishing-out assembly is arranged at the upper end of the treatment box, the clear water filtering and discharging assembly is arranged above the sludge discharging assembly, and the washing water feeding assembly extends into the treatment box; the outer end of the washing water feeding assembly is connected with a demulsifier adding and premixing assembly, and a microbubble generating assembly is arranged at the side end of the treatment box; effective separation between oil and water is achieved, the water content of finally discharged floating oil is extremely low, the situation that the discharged floating oil contains a large amount of water and occupies the storage space of a waste oil tank on a ship is avoided, meanwhile, discharged clear water does not need to be subjected to rear-end retreatment, the treatment procedure of washing water is simplified, and the cost is reduced. And the occupied space of the whole system is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of ship washing water treatment, and specifically discloses a structure and method for treating ship dual-fuel main engine flue gas washing water. Background Art

[0002] A dual-fuel main engine ship is a ship that can use diesel and liquefied natural gas as fuels. However, dual-fuel main engine ships are prone to problems of incomplete fuel combustion, resulting in a large amount of impurities such as emulsified oil and carbon powder particles in the washing liquid discharged from the flue gas scrubber. This part of the washing liquid needs to be effectively treated before it can be discharged.

[0003] The invention application with the application number 202311494863.4 discloses a ship iCER dual-fuel main engine flue gas washing water treatment device. This washing water treatment device forms a complete set of new washing water treatment devices by setting up a high-efficiency flotation separation module for clear water and oil sludge, a raw water adding demulsifier mixing and demulsifying module, a backend deep filtration module, and a water replenishing part is arranged at the top of the side wall of the vertical air flotation tank, and a drainage part is arranged near the bottom. Finally, it is electrically connected to the input and output components through a control cabinet. The device can mix the demulsifier with the raw water and then flow into the vertical air flotation tank. After high-efficiency flotation in the vertical air flotation tank, the oil sludge is automatically discharged from the sludge discharge pipe at the top of the vertical air flotation tank, and the clear water is pumped to the backend deep filter by a water production pump for filtration, and the water discharged after passing through the filter meets the discharge standard. However, when separating and filtering the demulsified washing water, this flue gas washing water treatment device only statically stratifies through the densities of three materials, namely oil, water, and mud, to achieve the separation effect. This separation method cannot ensure that the oil, water, and mud are separated cleanly. In particular, the separated clear water still needs to be secondary-treated by the backend deep filtration module to meet the discharge standard. In addition, the discharge of the upper floating oil is through the rise of the liquid level, and then it flows out from the sludge discharge pipe and is finally collected in a designated collection tank on the ship. The floating oil separated by this method will be mixed with a large amount of water, resulting in more than half of the internal space of the collection tank being washing water when collecting the floating oil. For a ship, the space volume of its floating oil or oil sludge collection tank is limited, resulting in its inability to collect and process the floating oil separated from a large amount of washing water. Therefore, in view of the above deficiencies of the existing ship iCER dual-fuel main engine flue gas washing water treatment device, the present application proposes a structure and method for treating ship dual-fuel main engine flue gas washing water that can effectively solve the above technical problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a structure and method for treating ship dual-fuel main engine flue gas washing water to solve the deficiencies existing in the separation of the demulsified materials by the existing ship iCER dual-fuel main engine flue gas washing water treatment device.

[0005] The present invention is achieved through the following technical solutions: A flue gas washing water treatment structure for a ship's dual-fuel main engine, comprising a treatment tank, a washing water feeding assembly, a sludge discharging assembly, an oil slick fishing-out assembly, and a clear water filtering and discharging assembly; The sludge discharging assembly is arranged at the lower end of the treatment tank, the oil slick fishing-out assembly is arranged at the upper end of the treatment tank, the clear water filtering and discharging assembly is arranged above the sludge discharging assembly, and the washing water feeding assembly extends into the treatment tank and is arranged between the clear water filtering and discharging assembly and the oil slick fishing-out assembly; The outer end of the washing water feeding assembly is connected with a demulsifier adding and premixing assembly, and a microbubble generating assembly is arranged at the side end of the treatment tank opposite to the washing water feeding assembly; The clear water filtering and discharging assembly includes an orifice plate arranged at the lower end of the inner cavity of the treatment tank. A row of filter cartridges with their lower ends hermetically connected to the orifice plate are arranged on the orifice plate, and a filter membrane layer is arranged on the outer surface of each filter cartridge. A suction branch pipe vertically extending downward is arranged in each filter cartridge, and the lower ends of a plurality of suction branch pipes are jointly connected with a suction main pipe. The outer end of the suction main pipe extending out of the treatment tank is connected with a water pump; The oil slick fishing-out assembly includes an oil suction drum rotatably arranged at the upper end of the inner cavity of the treatment tank. One end of the oil suction drum is connected with a power motor located on the outer end face of the treatment tank. An oil outlet parallel to the oil suction drum is opened at the upper end of the side face of the treatment tank. A scraping oil plate with its inner end fitting the upper half of the oil suction drum is fixedly installed in the oil outlet, and an oil collecting groove is arranged at the outer end of the scraping oil plate. An oil discharging pipe for directionally conveying the floating oil is connected to the oil collecting groove.

[0006] As a further setting of the above solution, two oil suction drums are symmetrically arranged at the upper end of the inner cavity of the treatment tank. Oil outlets are opened at the upper ends of both side faces of the treatment tank. A scraping oil plate acting on the corresponding oil suction drum is installed in each oil outlet. An oil collecting groove is arranged at the outer end of each scraping oil plate. The lower ends of the two oil collecting grooves are jointly connected with an oil discharging pipe through a lower oil pipe.

[0007] As a further setting of the above solution, the oil suction drum includes a cylindrical drum body. A plurality of strip-shaped grooves arranged axially are circumferentially and evenly opened on the outer circular surface of the drum body. A pushing strip is arranged in each strip-shaped groove. The inner end of the pushing strip is connected with the strip-shaped groove through a guide rod and a spring. An elastic oil suction cortex covering all the pushing strips is arranged on the outer circular surface of the drum body. Cam rings are concentrically fixed on the inner walls of the treatment tank at both ends of the drum body. A roller part acting on the cam ring is arranged at the outer side end of each pushing strip.

[0008] As a further setting of the above solution, the contour surface of the cam ring is composed of a large-radius arc segment, a small-radius arc segment, and transition segments on both sides, and the large-radius arc segment is arranged at the lower half of the cam ring.

[0009] As a further setting of the above solution, the washing water feeding assembly includes a spray pipe extending into the interior of the treatment tank and located directly above a row of filter cartridges. The outer end of the spray pipe is connected to a booster pump, and a row of spray holes are provided on both sides of the spray pipe located in the treatment tank.

[0010] As a further setting of the above solution, the demulsifier adding and premixing assembly includes a pre-mixer connected to the outer end of the spray pipe. The upper end of the pre-mixer is connected to an adding agent pipe, and the end of the adding agent pipe is connected to a demulsifier medicine tank through an adding agent pump.

[0011] As a further setting of the above solution, a rotating connection part is provided at the bottom of the spray pipe directly above each filter cartridge. A blade shaft is rotatably connected in the rotating connection part. A follower blade is provided on the blade shaft extending into the spray pipe. The lower end of the blade shaft is connected to a U-shaped brush holder, and brush hairs acting on the filter membrane layer on the filter cartridge are provided at both side ends of the U-shaped brush holder.

[0012] As a further setting of the above solution, two stirring shafts perpendicular to the spray pipe are rotatably provided in the treatment tank above the spray pipe. The outer ends of the stirring shafts are connected to stirring motors. A group of stirring blades are provided at both the front and rear ends of the stirring shafts located inside the treatment tank. The microbubble generating assembly includes a microbubble generator connected to the side end of the treatment tank, and the outer end of the microbubble generator is connected to a compressed air source through a compressed air pipe.

[0013] As a further setting of the above solution, the sludge discharging assembly includes a discharge barrel connected to the lower end of the treatment tank. A discharge auger blade shaft is rotatably installed in the discharge barrel. A discharge motor connected to the discharge auger blade shaft is provided on one end face of the discharge barrel, and a sludge outlet is provided on the lower surface of the other end of the discharge barrel.

[0014] The present invention also discloses a washing water treatment method using the above-mentioned ship dual-fuel main engine flue gas washing water treatment structure, including the following steps: S1: Use a demulsifier in an amount corresponding to the composition ratio of the ship dual-fuel main engine flue gas washing water. Then, premix the washing water with the demulsifier first, and then discharge it into the treatment tank through the washing water feeding assembly; S2: After the premixed material of the demulsifier and the washing water enters the treatment tank, start the microbubble generating assembly to generate a large number of high-pressure microbubbles from the lower end of one side of the treatment tank. Then, the premixed material is fully mixed under the action of the high-pressure microbubbles, so that the oil sludge in the washing water begins to separate under the action of the demulsifier. The separated light oil will quickly float under the action of the microbubbles, while the heavy sludge will begin to sink; S3: When a large amount of light oil accumulates and floats on the upper layer of the liquid level inside the treatment tank, the floating oil fishing component fishes out the floating oil and transports it to the waste oil tank in the ship at regular intervals. At the same time, the accumulated sludge that sinks is quantitatively discharged by the sludge discharge component. S4: Finally, during the operation of the clean water filtration and discharge component, the clean water inside the filter cartridge is continuously pumped out, increasing the pressure difference between the inside and outside of the filter cartridge. When the water liquid in the middle layer of the treatment tank enters the filter cartridge, it will be fully filtered by the filter membrane layer to ensure that the finally pumped out clean water can meet the direct discharge standard.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: When the flue gas washing water treatment structure of the ship's dual-fuel main engine disclosed in the present invention treats the flue gas washing water containing a large amount of oil sludge, it first performs demulsification treatment on the washing water by adding a demulsifier, causing the oil sludge in the washing water to lose the emulsification protection layer, resulting in the separation and stratification of the three materials of oil, water, and mud in the washing water. Coupled with the introduction of high-pressure microbubbles to accelerate the floating of light oil, then the rotating oil absorption drum above the liquid level is used to continuously adsorb the floating oil on the upper layer of the liquid level, and then it is shoveled off online by the oil scraping plate and collected and discharged in a directional manner. The water in the upper layer liquid has different properties from the floating oil and cannot adhere to the surface of the oil absorption roller like the demulsified floating oil, thus achieving an effective separation between oil and water, making the water content in the finally discharged floating oil extremely low, avoiding the discharged floating oil containing a large amount of water and occupying the storage space of the waste oil tank on the ship, enabling the ship to treat and collect a large amount of floating oil in the flue gas washing water.

[0016] The present invention further improves the structural design of the oil absorption drum. During the rotation of the oil absorption drum, the roller parts at both ends of the push bar will act on the outer circular surface of the cam ring. When the push bar rotates with the oil absorption drum and immerses into the light oil layer, the push bar will move downward against the tension of the spring, so that the lower end of the elastic oil absorption cortex can fully extend into the light oil layer, having a larger contact area with the light oil layer, adsorbing more floating oil through the elastic oil absorption cortex, and then returning to a circular shape when rotating to the upper half and being completely shoveled off by the oil scraping plate, enabling the oil absorption drum to adsorb more floating oil at one time and being shoveled off in time, improving the floating oil removal efficiency; the overall structural design of the oil absorption drum is novel and ingenious, and the effect of adsorbing and removing floating oil is better.

[0017] In the washing water treatment device of the present invention, a filter cartridge with a filter membrane layer coated on its outer surface is directly arranged in the treatment tank. Then, through the continuous suction action of the suction assembly on the inside of the filter cartridge, the sediment in the clear water will be directly filtered by the filter membrane layer, ensuring that the extracted clear water does not contain sludge and meeting the standard for direct discharge. In addition, the present invention also sets a brushing mechanism on the lower surface of the injection pipe, and utilizes the high-speed flow action of the premixed liquid to drive the operation of the brushing mechanism. Through the brushing mechanism, the filter membrane layer on the outer surface of the filter cartridge can be brushed in real time, enabling the filter membrane layer to maintain an efficient filtration and interception effect for a long time, so that the discharged clear water does not require post-treatment at the back end, simplifying the treatment process of the washing water and reducing the occupied space of the entire washing water treatment system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for describing the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0019] Figure 1 is a schematic three-dimensional structure diagram of the first angle of the present invention; Figure 2 is a schematic three-dimensional structure diagram of the second angle of the present invention; Figure 3 is a schematic three-dimensional structure diagram inside the treatment tank of the present invention; Figure 4 is a schematic side view plane structure diagram inside the treatment tank in Embodiment 1 of the present invention; Figure 5 is a schematic side view plane structure diagram inside the treatment tank in Embodiment 2 of the present invention; Figure 6 is a schematic three-dimensional structure diagram of the floating oil fishing component, injection pipe, stirring shaft, etc. of the present invention; Figure 7 is a schematic partial sectional internal structure diagram of the injection pipe of the present invention; Figure 8 is a schematic three-dimensional structure diagram of the oil absorption drum in Embodiment 2 of the present invention; Figure 9 is a schematic three-dimensional assembly diagram of the oil absorption drum in Embodiment 2 of the present invention; Figure 10 of the present invention Figure 1 is an enlarged structure diagram of part A.

[0020] Wherein: 1 - treatment tank, 2 - washing water feeding assembly, 201 - injection pipe, 202 - booster pump, 203 - injection hole, 204 - rotating connection part, 205 - blade shaft, 206 - follower blade, 207 - U-shaped brush holder, 208 - brush bristles, 3 - sludge discharge assembly, 301 - discharge cylinder, 302 - discharge auger leaf shaft, 303 - discharge motor, 304 - sludge outlet, 4 - floating oil fishing-out assembly, 401 - oil suction drum, 4011 - drum body, 4012 - strip groove, 4013 - pushing bar, 4014 - guide rod, 4015 - spring, 4016 - elastic oil suction cortex, 4017 - cam ring, 4018 - roller part, 402 - power motor, 403 - oil scraping plate, 404 - oil collecting tank, 405 - oil discharge pipe, 406 - lower oil pipe, 5 - clean water filtering and discharging assembly, 501 - orifice plate, 502 - filter cartridge, 503 - suction branch pipe, 504 - suction main pipe, 505 - water suction pump, 6 - demulsifier adding and premixing assembly, 601 - premixer, 602 - adding agent pipe, 603 - adding agent pump, 604 - demulsifier medicine tank, 7 - microbubble generating assembly, 701 - microbubble generator, 702 - compressed air pipe, 703 - compressed air source, 8 - stirring shaft, 801 - stirring motor, 802 - stirring blade, 9 - control box. Specific embodiments

[0021] In order to enable those skilled in the art to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0022] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following will refer to the attached Figures 1 to 10 drawings and describe this application in detail in combination with the embodiments. Embodiment 1

[0023] Embodiment 1 discloses a flue gas washing water treatment structure for a marine dual-fuel main engine. Refer to the attached Figures 1 - 3, including a treatment tank 1, a washing water feeding assembly 2, a sludge discharging assembly 3, an oil slick fishing assembly 4, a clean water filtering and discharging assembly 5, and a control box 9. Among them, the sludge discharging assembly 3 is arranged at the lower end of the treatment tank 1, the oil slick fishing assembly 4 is arranged at the upper end of the treatment tank 1, the clean water filtering and discharging assembly 5 is arranged above the sludge discharging assembly 3, and the washing water feeding assembly 2 extends into the treatment tank 1 and is arranged between the clean water filtering and discharging assembly 5 and the oil slick fishing assembly 4. At the same time, a demulsifier adding and premixing assembly 6 is connected to the outer end of the washing water feeding assembly 2, and a microbubble generating assembly 7 is arranged at the side end of the treatment tank 1 opposite to the washing water feeding assembly 2.

[0024] Reference appendix Figure 3 and appendix Figure 6 , the clean water filtering and discharging assembly 5 includes a perforated plate 501 arranged at the lower end of the inner cavity of the treatment tank 1. A row of filter cartridges 502 whose lower ends are hermetically connected to the perforated plate 501 are arranged on the perforated plate 501, and a filter membrane layer is arranged on the outer surface of the filter cartridges 502. The oil sludge in the treated washing water can be filtered and intercepted through the arranged filter membrane layer. A suction branch pipe 503 vertically extending downward is arranged in each filter cartridge 502. The lower ends of a plurality of suction branch pipes 503 are jointly connected to a suction main pipe 504, and the outer end of the suction main pipe 504 extending out of the treatment tank 1 is connected to a water pump 505.

[0025] Reference appendix Figure 1 , appendix Figure 3 and appendix Figure 10 , the washing water feeding assembly 2 includes a spray pipe 201 extending into the treatment tank 1 and located directly above a row of filter cartridges 502. A booster pump 202 is connected to the outer end of the spray pipe 201, and a row of spray holes 203 are arranged on both sides of the spray pipe 201 in the treatment tank 1. The demulsifier adding and premixing assembly 6 includes a premixer 601 connected to the outer end of the spray pipe 201. An additive pipe 602 is connected to the upper end of the premixer 601, and the end of the additive pipe 602 is connected to a demulsifier medicine tank 604 through an additive pump 603. Before the washing water feeding assembly 2 feeds into the treatment tank 1, the demulsifier in the demulsifier medicine tank 604 is quantitatively added to the premixer 601 by the additive pump 603 first, and then the washing water sent by the booster pump 202 will be premixed with the demulsifier in the premixer 601, and then they will be discharged into the treatment tank 1 together from the spray holes 203 on both sides of the spray pipe 201.

[0026] In addition, the present embodiment 1 is also provided with two stirring shafts 8 perpendicular to the injection pipe 201 in the treatment box 1 above the injection pipe 201, the outer end of the stirring shaft 8 is connected to a stirring motor 801, and the front and rear ends of the stirring shaft 8 located inside the treatment box 1 are provided with a group of stirring blades 802. The microbubble generating assembly 7 includes a microbubble generator 701 connected to the side end of the treatment box 1, and the outer end of the microbubble generator 701 is connected to a compressed air source 703 through a compressed air pipe 702. When the premixed liquid of washing water and demulsifier is ejected from the injection hole 203, on the one hand, it is stirred by the stirring blade 802, which accelerates the reaction between the two. On the other hand, the high-pressure microbubbles introduced by the microbubble generator 701 intensify the reaction between the premixed liquids, so that the oil, water and mud in the washing water are separated, and the microbubbles carry the light oil upward during the floating process and eventually float on the upper layer of the liquid level.

[0027] Reference Attachment Figure 3 The sludge discharge assembly 3 includes a discharge barrel 301 connected to the lower end of the treatment box 1. A discharge auger blade shaft 302 is rotatably mounted in the discharge barrel 301. A discharge motor 303 connected to the discharge auger blade shaft 302 is provided on one end surface of the discharge barrel 301. A sludge outlet 304 is provided on the lower surface of the other end of the discharge barrel 301. When the settled sludge accumulates in the discharge barrel 301, it acts as a seal. When the sludge reaches a certain amount, the discharge motor 303 is activated to rotate the discharge auger blade shaft 302, thereby discharging the sludge from the sludge outlet 304.

[0028] Reference Attachment Figure 4 The floating oil scooping assembly 4 includes an oil suction drum 401 rotatably provided at the upper end of the inner cavity of the processing box 1, one end of the oil suction drum 401 is connected to a power motor 402 located at the outer end surface of the processing box 1, and an oil outlet parallel to the oil suction drum 401 is provided at the upper end of the side of the processing box 1, and an oil scraper 403 is fixedly installed in the oil outlet, the inner end of which is in contact with the upper half of the oil suction drum 401, and an oil collecting groove 404 is provided at the outer end of the oil scraper 403, and an oil discharge pipe 405 for directional transportation of floating oil is connected to the oil collecting groove 404.

[0029] During the specific design, two oil suction drums 401 are symmetrically arranged at the upper end of the inner cavity of the processing box 1, and oil outlets are opened on the upper ends of both side surfaces of the processing box 1. Each oil outlet is installed with an oil scraper 403 that acts on the corresponding oil suction drum 401. The outer end of each oil scraper 403 is provided with an oil collecting groove 404, and the lower ends of the two oil collecting grooves 404 are connected to the oil drain pipe 405 through the lower oil pipe 406.

[0030] During the operation of the floating oil recovery component 4 in this Embodiment 1, the oil suction drum 401 is driven by the power motor 402 to rotate at a certain speed. The two oil suction drums 401 extend into the upper light oil layer. The demulsified light oil will continuously adhere to the oil suction drum 401, and after rotating upward, it will come into contact with the oil scraping plate 403. The auxiliary light oil is shoveled off by the oil scraping plate 403 and then flows into the oil collecting tank 404. Finally, it is directionally transported to the waste oil tank on the ship through the drain pipe 405 for collection. Embodiment Two

[0031] Embodiment 2 discloses a ship dual-fuel main engine flue gas washing water treatment structure improved on the basis of the technical solution in Embodiment 1, and the same parts as those in Embodiment 1 will not be described again.

[0032] Refer to the appendix Figure 3 and the appendix Figure 7 In addition, in this Embodiment 2, a rotating connection part 204 is provided at the bottom of the injection pipe 201 directly above each filter cartridge 502. A blade shaft 205 is rotatably connected in the rotating connection part 204. A follower blade 206 is provided on the blade shaft 205 extending into the injection pipe 201. The lower end of the blade shaft 205 is connected with a U-shaped brush holder 207. Brush hairs 208 acting on the filter membrane layer on the filter cartridge 502 are provided at both side ends of the U-shaped brush holder 207. Through the above improvement design in this Embodiment 2, when the premixed liquid enters the injection pipe 201, it will act on the follower blade 206, so that the blade shaft 205 rotates, and then drives the U-shaped brush holder 207 to rotate directionally. During the rotation of the U-shaped brush holder 207, the filter membrane layer on the outer surface of the corresponding filter cartridge 502 can be cleaned by the brush hairs 208, avoiding sludge from adhering to its surface and affecting the subsequent filtration and interception effect of the muddy water.

[0033] Refer to the appendix Figure 5 、the appendix Figure 8 and the appendix Figure 9 In this Embodiment 2, the oil suction drum 401 includes a cylindrical drum body 4011. A plurality of strip-shaped grooves 4012 arranged axially are circumferentially and uniformly formed on the outer circumferential surface of the drum body 4011. A push bar 4013 is arranged in each strip-shaped groove 4012. The inner end of the push bar 4013 is connected with the strip-shaped groove 4012 through a guide rod 4014 and a spring 4015. An elastic oil suction cortex 4016 covering all the push bars 4013 is arranged on the outer circumferential surface of the drum body 4011. Cam rings 4017 are concentrically fixed on the inner walls of the processing box 1 at both ends of the drum body 4011. A roller member 4018 acting on the cam ring 4017 is arranged at the outer end of each push bar 4013. In addition, the contour surface of the cam ring 4017 is composed of a large-radius arc segment, a small-radius arc segment and transition segments on both sides, and the large-radius arc segment is arranged in the lower half of the cam ring 4017.

[0034] In Embodiment 2, through the special design of the oil-absorbing drum 401, during the rotation of the oil-absorbing drum 401, the roller parts 4018 at both ends of the pushing bar 4013 will act on the outer cylindrical surface of the cam ring 4017. When the pushing bar 4013 rotates with the oil-absorbing drum 401 and immerses into the light oil layer, the pushing bar 4013 will move downward against the tension of the spring 4015, so that the lower end of the elastic oil-absorbing cortex 4016 can fully extend into the light oil layer, having a larger contact area with the light oil layer, adsorbing more floating oil through the elastic oil-absorbing cortex 4016, and then returning to a circular shape when rotating to the upper half and being completely scraped off by the oil scraping plate 403, enabling the oil-absorbing drum 401 to adsorb more floating oil at one time and scrape it off in time, improving the efficiency of removing floating oil. Embodiment Three

[0035] Embodiment 3 discloses a washing water treatment method using the ship dual-fuel main engine flue gas washing water treatment structure in Embodiment 1 or Embodiment 2, including the following steps: First step, first use a demulsifier in an amount corresponding to the composition ratio of the ship dual-fuel main engine flue gas washing water, and then premix the washing water with the demulsifier first, and then discharge it into the treatment tank 1 by the washing water feeding assembly 2; Second step, after the premixed material of the demulsifier and the washing water enters the treatment tank 1, start the microbubble generating assembly 7 to generate a large number of high-pressure microbubbles from the lower end of one side of the treatment tank 1, and then the premixed material is fully mixed under the action of the high-pressure microbubbles, so that the oil sludge in the washing water begins to separate under the action of the demulsifier. The separated light oil will quickly float upward under the action of the microbubbles, while the heavy sludge will begin to sink; Third step, when a large amount of light oil accumulates and floats on the upper layer of the liquid level inside the treatment tank 1, the floating oil is fished out by the floating oil fishing-out assembly 4 and regularly transported to the waste oil tank on the ship, and at the same time, the sludge that sinks and accumulates is quantitatively discharged by the sludge discharging assembly 3; Fourth step, during the operation of the clean water filtering and discharging assembly 5, the clean water inside the filter cartridge 502 is continuously pumped out, and the pressure difference between the inside and outside of the filter cartridge 502 increases. When the water liquid in the middle layer of the treatment tank 1 enters the filter cartridge 502, it will be fully filtered by the filter membrane layer to ensure that the finally pumped out clean water can meet the direct discharge standard.

[0036] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A flue gas washing water treatment structure for a marine dual-fuel main engine, characterized in that, It comprises a treatment box (1), a washing water feeding assembly (2), a sludge discharge assembly (3), an oil floating removal assembly (4) and a clean water filtering and discharge assembly (5); The sludge discharge assembly (3) is arranged at the lower end of the treatment box (1), the floating oil scooping assembly (4) is arranged at the upper end of the treatment box (1), the clean water filter discharge assembly (5) is arranged above the sludge discharge assembly (3), and the washing water feed assembly (2) extends into the treatment box (1) and is arranged between the clean water filter discharge assembly (5) and the floating oil scooping assembly (4); The outer end of the washing water feeding assembly (2) is connected to a demulsifier adding premixing assembly (6), and a micro-bubble generating assembly (7) is provided on the side end of the treatment box (1) opposite to the washing water feeding assembly (2); The clean water filter discharge assembly (5) comprises a perforated plate (501) arranged at the lower end of the inner cavity of the treatment box (1); a row of filter cartridges (502) whose lower ends are sealedly connected to the perforated plate (501) are arranged on the perforated plate (501); and a filter membrane layer is arranged on the outer surface of the filter cartridges (502); each of the filter cartridges (502) is provided with a suction branch pipe (503) extending vertically from the lower end; the lower ends of the plurality of suction branch pipes (503) are commonly connected to a suction main pipe (504); and the outer end of the suction main pipe (504) extending from the treatment box (1) is connected to a water pump (505); The floating oil scooping assembly (4) comprises an oil suction drum (401) rotatably provided at the upper end of the inner cavity of the processing box (1); one end of the oil suction drum (401) is connected to a power motor (402) located at the outer end surface of the processing box (1); an oil outlet parallel to the oil suction drum (401) is provided at the upper end of the side surface of the processing box (1); an oil scraper (403) whose inner end is in contact with the upper half of the oil suction drum (401) is fixedly installed in the oil outlet; an oil collecting groove (404) is provided at the outer end of the oil scraper (403); and an oil drain pipe (405) for directional transportation of floating oil is connected to the oil collecting groove (404).

2. The flue gas washing water treatment structure of the dual-fuel main engine of a ship according to claim 1, characterized in that, Two oil suction drums (401) are symmetrically arranged at the upper end of the inner cavity of the processing box (1), and oil outlets are opened at the upper ends of both side surfaces of the processing box (1). Each oil outlet is installed with an oil scraper (403) that interacts with the corresponding oil suction drum (401), and an oil collecting groove (404) is arranged at the outer end of each oil scraper (403). The lower ends of the two oil collecting grooves (404) are connected to an oil drain pipe (405) through a lower oil pipe (406).

3. The flue gas washing water treatment structure of the ship's dual-fuel main engine according to claim 2, characterized in that, The oil-absorbing drum (401) includes a cylindrical drum body (4011). A plurality of strip-shaped grooves (4012) arranged axially are circumferentially and uniformly formed on the outer circumferential surface of the drum body (4011). A push bar (4013) is arranged in each strip-shaped groove (4012). The inner end of the push bar (4013) is connected to the strip-shaped groove (4012) through a guide rod (4014) and a spring (4015). An elastic oil-absorbing cortex (4016) covering all the push bars (4013) is arranged on the outer circumferential surface of the drum body (4011). Cam rings (4017) are concentrically fixed on the inner walls of the treatment tank (1) on both ends of the drum body (4011). A roller member (4018) acting on the cam ring (4017) is arranged at the outer end of each push bar (4013).

4. The flue gas washing water treatment structure of the ship's dual-fuel main engine according to claim 3, characterized in that, The contour surface of the cam ring (4017) is formed by connecting a large-radius arc segment, a small-radius arc segment and transition segments on both sides, and the large-radius arc segment is arranged on the lower half of the cam ring (4017).

5. The flue gas washing water treatment structure of the ship's dual-fuel main engine according to claim 1, characterized in that, The washing water feeding assembly (2) includes a spray pipe (201) extending into the treatment tank (1) and located directly above a row of filter cartridges (502). A booster pump (202) is connected to the outer end of the spray pipe (201). A row of spray holes (203) are formed on both sides of the spray pipe (201) located in the treatment tank (1).

6. The flue gas washing water treatment structure of the ship's dual-fuel main engine according to claim 5, characterized in that, The demulsifier adding and premixing assembly (6) includes a premixer (601) connected to the outer end of the spray pipe (201). An adding agent pipe (602) is connected to the upper end of the premixer (601). The end of the adding agent pipe (602) is connected to a demulsifier medicine tank (604) through an adding agent pump (603).

7. The flue gas washing water treatment structure of the ship's dual-fuel main engine according to claim 5, characterized in that, A rotating connection part (204) is arranged at the bottom of the spray pipe (201) directly above each filter cartridge (502). A blade shaft (205) is rotatably connected in the rotating connection part (204). Follow-up blades (206) are arranged on the blade shaft (205) extending into the spray pipe (201). The lower end of the blade shaft (205) is connected to a U-shaped brush holder (207). Brush hairs (208) acting on the filter membrane layer of the filter cartridge (502) are arranged at both side ends of the U-shaped brush holder (207).

8. The flue gas washing water treatment structure of the ship's dual-fuel main engine according to claim 5, characterized in that Two stirring shafts (8) perpendicular to the spray pipe (201) are rotatably arranged in the treatment tank (1) above the spray pipe (201). A stirring motor (801) is connected to the outer end of the stirring shaft (8). A group of stirring blades (802) are arranged at both the front and rear ends of the stirring shaft (8) inside the treatment tank (1). The microbubble generating assembly (7) includes a microbubble generator (701) connected to the side end of the treatment tank (1). The outer end of the microbubble generator (701) is connected to a compressed air source (703) through a compressed air pipe (702).

9. The flue gas washing water treatment structure of the ship's dual-fuel main engine according to claim 1, characterized in that, The sludge discharge assembly (3) includes a discharge cylinder (301) connected to the lower end of the treatment tank (1). A discharge auger blade shaft (302) is rotatably installed in the discharge cylinder (301). A discharge motor (303) connected to the discharge auger blade shaft (302) is arranged on one end face of the discharge cylinder (301). A sludge outlet (304) is arranged on the lower surface of the other end of the discharge cylinder (301).

10. A method for treating flue gas washing water using the ship dual-fuel main engine flue gas washing water treatment structure according to any one of claims 1-9, characterized in that, It includes the following steps: S1: Use a demulsifier corresponding to the composition ratio and dosage of the flue gas washing water of the ship's dual-fuel main engine. Then, after premixing the washing water with the demulsifier first, it is discharged into the treatment tank (1) by the washing water feeding assembly (2). S2: After the premixed material of the demulsifier and the washing water enters the treatment tank (1), start the microbubble generating assembly (7) to generate a large number of high-pressure microbubbles from the lower end of one side of the treatment tank (1). Then, the premixed material is fully mixed under the action of the high-pressure microbubbles, so that the oil sludge in the washing water begins to separate under the action of the demulsifier. The separated light oil will quickly float up under the action of the microbubbles, while the heavy sludge will begin to sink. S3: When a large amount of light oil accumulates and floats on the upper layer of the liquid level inside the treatment tank (1), the floating oil fishing assembly (4) fishes out the floating oil and regularly transports it to the waste oil tank on the ship. At the same time, the sludge that sinks and accumulates is quantitatively discharged by the sludge discharge assembly (3). S4: During operation, the clean water filtering and discharging assembly (5) continuously pumps out the clean water inside the filter cartridge (502), increasing the pressure difference between the inside and outside of the filter cartridge (502). When the water liquid in the middle layer of the treatment tank (1) enters the inside of the filter cartridge (502), it is fully filtered by the filter membrane layer to ensure that the finally pumped out clean water can meet the direct discharge standard.

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