Closed water mist dust suppression system for bauxite ore carrier fan house louvers

Abstract

The application discloses a closed water mist dust removal system for a bauxite ore ship fan room shutter, which comprises a plurality of nozzles 1 arranged in multiple rows at equal intervals side by side above the fan room shutter; a water collecting tank 2 arranged below the fan room shutter, the inside of the bottom of the water collecting tank 2 being provided with an inclined slope, and the lowest end of the bottom of the water collecting tank 2 being provided with a water collecting tank discharge pipe 3; a circulating water tank 4, the inside of which is provided with a sand filter layer 22, one side of the sand filter layer 22 being a sewage side, and the other side of the sand filter layer 22 being a clean water side, the sewage side of the circulating water tank 4 being communicated with the water collecting tank discharge pipe 3 below, and the clean water side of the circulating water tank 4 being provided with a water supplementing device; and a fresh water circulating pipeline 19, one end of which is connected with the clean water side outlet of the circulating water tank 4, and the other end of which is connected with the plurality of nozzles 1. The application can prevent the problems such as environmental pollution of the cabin, equipment damage, health damage of personnel, high maintenance cost and potential explosion risk caused by dust entering the cabin through the shutter.

Description

Technical Field

[0001] This application relates to the field of dust removal technology for ore ships, specifically to a closed water mist dust removal system for the louvers of the fan room of a bauxite ore ship. Background Technology

[0002] During loading and unloading operations on bauxite / ore carriers, the inherent characteristics of the cargo generate a large amount of dust. This dust inevitably gets drawn into the blower through the louvers of the blower room, affecting not only the blower's normal operation and lifespan but also potentially entering the engine room through the ventilation ducts, spreading throughout the cabin, deteriorating the engine room environment, and threatening the health of the crew. More importantly, when the bauxite dust concentration reaches the lower explosive limit and contains high levels of impurities or aluminum, there is a risk of explosion should a static electricity, open flame, or mechanical spark ignite the area.

[0003] Currently, water mist systems on traditional bauxite / ore carriers are mostly focused on fire prevention and explosion suppression. Their deployment area typically does not cover the louvered area of ​​the fan room, nor do they fully consider the impact of dust on crew health and the long-term operation of engine room equipment. In addition, while adsorption-type dust collection systems are effective to some extent, they require regular manual cleaning by crew members, resulting in high labor costs and inconvenient maintenance.

[0004] Existing water mist systems are mostly open designs, which cannot achieve freshwater recycling, and their structures are complex and costly. Therefore, to improve the operational efficiency and safety of bauxite / ore carriers, it is particularly necessary to develop a closed water mist dust removal system specifically for the fan room. Utility Model Content

[0005] In view of this, the main objective of this application is to provide a closed water mist dust removal system for the louvers of the blower room of a bauxite ore ship, which helps to prevent dust from entering the engine room through the louvers and causing problems such as engine room environmental pollution, equipment damage, personnel health damage, high maintenance costs and potential explosion risks.

[0006] This application provides a closed-loop water mist dust removal system for the louvers of the fan room of a bauxite ore ship, comprising:

[0007] Multiple nozzles 1 are arranged in parallel rows at equal intervals above the louvers of the fan room;

[0008] Water collection trough 2 is located below the louvers of the fan room. The bottom inner side of the water collection trough 2 is provided with an inclined slope. The lowest end of the bottom of the water collection trough 2 is equipped with a water collection trough drain pipe 3.

[0009] The circulating water tank 4 has a sand filter layer 22 inside. One side of the sand filter layer 22 is the sewage side, and the other side is the clean water side. The drain pipe 3 of the water collection tank is connected to the sewage side of the circulating water tank 4. A water replenishment device is provided on the clean water side of the circulating water tank 4.

[0010] The freshwater circulation pipe 19 is connected at one end to the clean water outlet of the circulating water tank 4, and at the other end to multiple nozzles 1.

[0011] As described above, multiple nozzles 1 are directly arranged above the louvers of the fan room, allowing for water mist washing of dust before it is drawn into the fan. This prevents dust from entering the engine room and causing environmental pollution, equipment damage, personnel health problems, and potential explosion risks. The closed-loop water mist dust removal system collects wastewater after water mist washing through a water collection tank 2 with an inclined slope. The wastewater is then filtered through a sand filter layer 22 in the circulating water tank 4 to obtain clean water. This clean water is then recycled through a fresh water circulation pipeline 19, which saves costs and reduces the consumption of fresh water resources. Furthermore, this closed-loop water mist dust removal system is independent of the open water mist system on bauxite / ore ships and can be flexibly installed in other places where dust removal is required.

[0012] Optionally, from the circulating water tank 4 to the multiple nozzles 1, the fresh water circulation pipeline 19 is sequentially equipped with a circulating water tank outlet valve 12, a Y-type filter 13, a pneumatic pump inlet pressure gauge 14, a pneumatic pump 15, a pneumatic pump outlet pressure gauge 16, a pneumatic pump outlet valve 17, and a circulation pipeline relief valve 18.

[0013] As described above, the freshwater circulation pipeline 19 provides stable pressure through the pneumatic pump 15, ensuring that the clean water in the circulating water tank 4 smoothly enters the multiple nozzles 1, ensuring that the nozzles can generate effective fan-shaped water mist and improve dust removal efficiency; by installing a pneumatic pump inlet pressure gauge 14 at the inlet of the pneumatic pump 15 and a pneumatic pump outlet pressure gauge 16 at its outlet, the operating status of the pneumatic pump 15 is monitored in real time, improving the maintainability of the closed water mist dust removal system; the circulating water tank outlet valve 12 controls the water output from the circulating water tank 4; the Y-type filter 13 performs secondary filtration on the filtered clean water to prevent the nozzles 1 from clogging; the circulating pipeline drain valve 18 is used to drain the water in the freshwater circulation pipeline 19 to prevent corrosion of the pipeline due to freezing in winter or long-term shutdown.

[0014] Optionally, the water supply device includes:

[0015] A float-type self-closing automatic water replenishment valve 6 is installed inside the upper part of the clear water side of the circulating water tank 4 to automatically replenish the clear water side of the circulating water tank 4.

[0016] Automatic water replenishment valve 10 is mounted on the upper outer side of the clean water side of the circulating water tank 4. The automatic water replenishment valve 10 is kept in the normally open state to automatically replenish water to the clean water side of the circulating water tank 4.

[0017] The manual water supply valve 9 is mounted on the outside of the clean water side of the circulating water tank 4, and is connected in parallel above the automatic water supply valve 10 for manually supplying water to the clean water side of the circulating water tank 4.

[0018] As described above, the float-type self-closing automatic water replenishment valve 6 can automatically sense the water level to achieve automatic opening and closing. That is, it automatically opens to replenish water when the water level drops and automatically closes when the water level recovers. The automatic water replenishment valve 10 remains in a normally open state to ensure stable water supply pressure. The two work together to automatically replenish water when the water level in the circulating water tank 4 is insufficient. The manual water replenishment valve 9 is in a normally closed state and is used for manual water replenishment in special circumstances such as failure of automatic water replenishment or commissioning of the closed water mist dust removal system.

[0019] Optionally, a drain valve 5 is provided at the bottom of the sewage side and the clean water side of the circulating water tank 4 respectively; a sight glass 7 and a liquid level sensor 8 are respectively installed on the sewage side of the circulating water tank 4; a circulating water tank float switch 11 is installed on the clean water side of the circulating water tank 4, which is located at 20% liquid level height on the clean water side of the circulating water tank 4.

[0020] As described above, the drain valve 5 is used to discharge the sludge deposited at the bottom of the circulating water tank 4 to prevent clogging of the sand filter layer 22; the inspection mirror 7 can directly observe the turbidity of the sewage on the sewage side of the circulating water tank 4; the liquid level sensor 8 monitors the water level on the sewage side of the circulating water tank 4 in real time; the circulating water tank float switch 11 monitors the water level on the clean water side of the circulating water tank 4 in real time, and alarms in time when the water level is lower than the preset low level (i.e., 20% of the liquid level height of the circulating water tank 4) to prevent the pneumatic pump 15 from running dry when the water volume is insufficient.

[0021] Optionally, a compressed air line check valve 21 is installed on the freshwater circulation line 19, near the side of the plurality of nozzles 1. The compressed air line check valve 21 is connected to the cabin compressed air system for use in reverse purging cleaning with compressed air when the nozzles 1 are blocked.

[0022] Therefore, by utilizing the cabin compressed air system, the clogged nozzle 1 can be quickly cleared by reverse purging without disassembling the nozzle 1, which reduces maintenance difficulty and saves time.

[0023] Optionally, an overflow pipe 20 is provided on the upper outer side of the clear water side of the circulating water tank 4. The inlet of the overflow pipe 20 is located at 90% liquid level on the clear water side of the circulating water tank 4, and the outlet of the overflow pipe 20 is connected to the bilge water tank.

[0024] As a result, the overflow pipe 20 can prevent the water level in the circulating water tank 4 from overflowing due to excessively high water levels, thus improving the safety of the closed-loop water mist dust removal system.

[0025] Optionally, the loop vent valve 18 is installed at the lowest point of the freshwater circulation pipe 19.

[0026] As described above, the circulation pipeline drain valve 18 is used to discharge the residual circulating water in the pipeline after the closed water mist dust removal system is shut down.

[0027] Optionally, the inner wall of the water collection tank 2 is equipped with an anti-clogging filter screen.

[0028] As described above, large particles of mineral sand are intercepted by the anti-clogging filter screen to prevent blockage of the drainage pipe 3 of the water collection tank, thus ensuring smooth drainage.

[0029] Optionally, an inspection mirror 7 is provided on the overflow pipe 20.

[0030] As shown above, the overflow pipe 20 can be observed through the inspection mirror 7 to determine whether the circulating water tank 4 is in an overflow state, and to detect any abnormalities in the automatic water replenishment in a timely manner.

[0031] Optionally, the signal output terminal of the level sensor 8 is connected to the monitoring system in the ship's bridge or control room.

[0032] As mentioned above, the liquid level sensor 8 is integrated into the bridge and central control room to prevent insufficient manpower during the loading and unloading of cargo, which would prevent the operation status of the closed water mist dust removal system from being monitored.

[0033] In summary, the closed-loop water mist dust removal system for the louvers of the blower room of a bauxite ore ship provided in this application directly washes the louvers of the blower room with water mist by setting multiple nozzles 1 at equal intervals above the louvers of the blower room, which can spray fan-shaped water mist. This washes away the dust such as bauxite / ore, preventing it from directly entering the engine room. The wastewater after water mist washing is collected through the water collection tank 2 and flows into the circulating water tank 4 through the water collection tank drain pipe 3 below the water collection tank 2. The circulating water tank 4 filters the wastewater into clean water through the sand filter layer 22. The clean water is then transported to the nozzles 1 through the fresh water circulation pipeline 19, completing the closed-loop fresh water circulation and saving fresh water resources. Attached Figure Description

[0034] The various technical features of this application and their relationships will be further explained below with reference to the accompanying drawings. The drawings are exemplary; some technical features are not shown to scale, and some drawings may omit technical features commonly used in the art to which this application pertains that are not essential for understanding and implementing this application, or additionally show technical features that are not essential for understanding and implementing this application. In other words, the combination of various technical features shown in the drawings is not intended to limit this application. Furthermore, throughout this application, the same reference numerals refer to the same things. Specific descriptions of the drawings are as follows:

[0035] Figure 1 This is a structural diagram of a closed water mist dust removal system for the louvers of the fan room of a bauxite ore ship, as described in this application.

[0036] Explanation of reference numerals in the attached figures

[0037] 1- Nozzle, 2- Water collection tank, 3- Water collection tank drain pipe, 4- Circulating water tank, 5- Drain valve, 6- Float-type self-closing automatic water replenishment valve, 7- Inspection mirror, 8- Liquid level sensor, 9- Manual water replenishment valve, 10- Automatic water replenishment valve, 11- Circulating water tank float switch, 112- Circulating water tank outlet valve, 13- Y-type filter, 14- Pneumatic pump inlet pressure gauge, 15- Pneumatic pump, 16- Pneumatic pump outlet pressure gauge, 17- Pneumatic pump outlet valve, 18- Circulating pipeline drain valve, 19- Freshwater circulating pipeline, 20- Overflow pipeline, 21- Compressed air pipeline check valve, 22- Sand filter layer.

[0038] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0039] The preferred embodiments of this application will now be described in detail with reference to the accompanying drawings, so that the advantages and features of this application can be more easily understood by those skilled in the art, thereby providing a clearer and more definite definition of the scope of protection of this application.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0041] It should be noted that in the description herein, the terms "middle," "front," "back," "top," "bottom," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0042] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linked," "socketed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection; they can refer to a direct connection, or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0043] To clearly illustrate the implementation of this application, the structures shown in the accompanying drawings are merely illustrative of preferred embodiments of this application and are not intended to limit the technical solutions of this application. Some details (such as specific dimensions, shapes, or connection methods) may be simplified or omitted, and should not be presumed to be an undue limitation on the scope of protection of this application. For the omitted parts or details that are not precisely represented, those skilled in the art can understand and implement them based on the content of this application and conventional technical means.

[0044] Bauxite (also known as bauxite ore) is mainly composed of aluminum oxide, silicon dioxide, iron oxide, and small amounts of impurities such as titanium and calcium. Dust is micron-sized particulate matter generated during the crushing and grinding of the ore, and its generation is unavoidable during the loading and unloading of bauxite ships.

[0045] The main hazards of bauxite dust are divided into health hazards and explosion hazards. Health hazards: Long-term inhalation can lead to pneumoconiosis, causing coughing, pulmonary fibrosis; dust adsorbing oils can cause skin diseases; and dust entering the eyes can cause conjunctivitis. Explosion hazards: When bauxite dust contains impurities or has a high aluminum content, the explosion risk increases significantly. In complex situations such as loading and unloading bauxite / ore ships at ports, where dust levels are high, the explosion risk is greatly increased, and the consequences of an explosion would be extremely severe.

[0046] Ventilation fans are the primary source of fresh air in a ship's engine room. Located in the fan room, they function to ventilate the engine room. The fan room is typically located inside the ship's funnel and is a small, independent room. The walls of the fan room are fitted with louvers that connect to the fan intake. Due to the properties of bauxite dust—fine particles, large specific surface area, and easy suspension in the air—dust generated during the loading and unloading of bauxite / ore carriers is easily drawn into the fan and then transported into the engine room along with fresh air through ducts. This dust significantly impacts the health of engine room personnel and the normal operation of the fans and engine room equipment.

[0047] Currently, water mist spraying systems on bauxite / ore carriers are mostly used in high-risk areas such as cargo holds, decks, and ports. These systems take the form of high-pressure water mist explosion suppression systems, fixed deck spraying systems, and retractable outer plating spraying devices. These systems effectively prevent explosions and protect the health of deck and port personnel. However, they cannot protect against the hazards posed by dust entering the engine room through the fan room louvers, and most of these systems are open systems that cannot recycle fresh water, resulting in high costs.

[0048] This application aims to solve the above problems by inventing a closed water mist system that can prevent bauxite dust from entering the fan, nacelle, and nacelle equipment, effectively protecting the fan room environment, the operation of nacelle equipment, and the health of nacelle personnel. It is also low in cost, easy to operate, and easy to maintain.

[0049] The closed-loop water mist dust removal system for the blower room proposed in this application directly targets the source of dust intrusion—the louvers at the blower's intake—simultaneously addressing health hazards to crew members and the wear and tear and malfunctions of the blower and engine room equipment caused by dust. The system employs a closed-loop circulation system, significantly reducing freshwater consumption. Its compact structure and convenient installation make it highly adaptable to both newbuildings and retrofits of existing vessels. During bauxite / ore loading and unloading operations on bauxite carriers, it continuously suppresses dust, protecting crew health and ensuring the stable operation of the blower and engine room equipment.

[0050] The technical solutions of this application and how they solve the aforementioned technical problems will be described in detail below with specific embodiments. The specific embodiments described below can be combined with each other to form new embodiments. The same or similar ideas or processes described in one embodiment may not be repeated in other embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0051] Figure 1 This is a structural diagram of a specific embodiment of the closed-loop water mist dust removal system for the louvers of the fan room of a bauxite ore ship according to this application. Figure 1 As shown, this application provides a closed-loop water mist dust removal system for the louvers of the fan room of a bauxite ore ship, comprising:

[0052] Multiple nozzles 1 are arranged in parallel rows at equal intervals above the louvers of the fan room;

[0053] Water collection trough 2 is located below the louvers of the fan room. The bottom inner side of the water collection trough 2 is provided with an inclined slope. The lowest end of the bottom of the water collection trough 2 is equipped with a water collection trough drain pipe 3.

[0054] The circulating water tank 4 has a sand filter layer 22 inside. One side of the sand filter layer 22 is the sewage side, and the other side is the clean water side. The drain pipe 3 of the water collection tank is connected to the sewage side of the circulating water tank 4. A water replenishment device is provided on the clean water side of the circulating water tank 4.

[0055] The freshwater circulation pipe 19 is connected at one end to the clean water outlet of the circulating water tank 4, and at the other end to multiple nozzles 1.

[0056] Specifically, multiple nozzles 1 are directly arranged above the louvers of the fan room, and water mist is used to wash the dust directly before it is sucked into the fan, thereby preventing dust from entering the cabin and causing problems such as environmental pollution, equipment damage, personnel health damage, and potential explosion risks. This closed water mist dust removal system collects the wastewater after water mist washing through a water collection tank 2 with an inclined slope. The wastewater is then filtered through a sand filter layer 22 in a circulating water tank 4 to obtain clean water. The clean water is then recycled through a fresh water circulation pipeline 19, which can recycle fresh water, save costs, and reduce the consumption of fresh water resources. Furthermore, this closed water mist dust removal system is independent of the open water mist system on bauxite / ore ships and can be flexibly set up in other places where dust removal is required.

[0057] Optionally, from the circulating water tank 4 to the multiple nozzles 1, the fresh water circulation pipeline 19 is sequentially equipped with a circulating water tank outlet valve 12, a Y-type filter 13, a pneumatic pump inlet pressure gauge 14, a pneumatic pump 15, a pneumatic pump outlet pressure gauge 16, a pneumatic pump outlet valve 17, and a circulation pipeline relief valve 18.

[0058] Specifically, the freshwater circulation pipeline 19 provides stable pressure through the pneumatic pump 15, ensuring that the clean water in the circulating water tank 4 smoothly enters the multiple nozzles 1, ensuring that the nozzles can generate effective fan-shaped water mist and improve dust removal efficiency; by installing a pneumatic pump inlet pressure gauge 14 at the inlet and a pneumatic pump outlet pressure gauge 16 at the outlet of the pneumatic pump 15, the operating status of the pneumatic pump 15 is monitored in real time, improving the maintainability of the closed water mist dust removal system; the circulating water tank outlet valve 12 controls the water output from the circulating water tank 4; the Y-type filter 13 performs secondary filtration on the filtered clean water to prevent the nozzles 1 from clogging; the circulating pipeline drain valve 18 is used to drain the water in the freshwater circulation pipeline 19 to prevent corrosion of the pipeline due to freezing in winter or long-term shutdown.

[0059] Optionally, a compressed air line check valve 21 is installed on the freshwater circulation line 19, near the side of the plurality of nozzles 1. The compressed air line check valve 21 is connected to the cabin compressed air system for use in reverse purging cleaning with compressed air when the nozzles 1 are blocked.

[0060] Specifically, by using the cabin compressed air system, the clogged nozzle 1 can be quickly cleared by reverse blowing without disassembling the nozzle 1, which can reduce maintenance difficulty and save time.

[0061] Optionally, the loop vent valve 18 is installed at the lowest point of the freshwater circulation pipe 19.

[0062] Specifically, the circulation pipeline drain valve 18 is used to discharge the residual circulating water in the pipeline after the closed water mist dust removal system is shut down.

[0063] Optionally, the water supply device includes:

[0064] A float-type self-closing automatic water replenishment valve 6 is installed inside the upper part of the clear water side of the circulating water tank 4 to automatically replenish the clear water side of the circulating water tank 4.

[0065] Automatic water replenishment valve 10 is mounted on the upper outer side of the clean water side of the circulating water tank 4. The automatic water replenishment valve 10 is kept in the normally open state to automatically replenish water to the clean water side of the circulating water tank 4.

[0066] The manual water supply valve 9 is mounted on the outside of the clean water side of the circulating water tank 4, and is connected in parallel above the automatic water supply valve 10 for manually supplying water to the clean water side of the circulating water tank 4.

[0067] Specifically, the float-type self-closing automatic water replenishment valve 6 can automatically sense the water level and achieve automatic opening and closing. That is, it automatically opens to replenish water when the water level drops and automatically closes when the water level recovers. The automatic water replenishment valve 10 remains in a normally open state to ensure stable water supply pressure. The two work together to automatically replenish water when the water level in the circulating water tank 4 is insufficient. The manual water replenishment valve 9 is in a normally closed state and is used for manual water replenishment in special circumstances such as failure of automatic water replenishment or commissioning of the closed water mist dust removal system.

[0068] Optionally, a drain valve 5 is provided at the bottom of the sewage side and the clean water side of the circulating water tank 4 respectively; a sight glass 7 and a liquid level sensor 8 are respectively installed on the sewage side of the circulating water tank 4; a circulating water tank float switch 11 is installed on the clean water side of the circulating water tank 4, which is located at 20% liquid level height on the clean water side of the circulating water tank 4.

[0069] Specifically, the drain valve 5 is used to discharge the sludge deposited at the bottom of the circulating water tank 4 to prevent clogging of the sand filter layer 22; the inspection mirror 7 can directly observe the turbidity of the sewage on the sewage side of the circulating water tank 4; the liquid level sensor 8 monitors the water level on the sewage side of the circulating water tank 4 in real time; the circulating water tank float switch 11 monitors the water level on the clean water side of the circulating water tank 4 in real time, and alarms in time when the water level is lower than the preset low level (i.e., 20% of the liquid level height of the circulating water tank 4) to prevent the pneumatic pump 15 from running dry when the water volume is insufficient.

[0070] Optionally, an overflow pipe 20 is provided on the upper outer side of the clear water side of the circulating water tank 4. The inlet of the overflow pipe 20 is located at 90% liquid level on the clear water side of the circulating water tank 4, and the outlet of the overflow pipe 20 is connected to the bilge water tank.

[0071] Specifically, the overflow pipe 20 can prevent the water level in the circulating water tank 4 from overflowing due to excessively high water levels, thereby improving the safety of the closed-loop water mist dust removal system.

[0072] Optionally, an inspection mirror 7 is provided on the overflow pipe 20.

[0073] Specifically, the inspection mirror 7 can be used to observe whether there is water flow in the overflow pipe 20, determine whether the circulating water tank 4 is in an overflow state, and promptly detect any abnormalities in automatic water replenishment.

[0074] Optionally, the signal output terminal of the level sensor 8 is connected to the monitoring system in the ship's bridge or control room.

[0075] Specifically, the liquid level sensor 8 is integrated into the bridge and control room to prevent insufficient manpower during the loading and unloading of cargo, which would prevent the operation of the closed water mist dust removal system from being monitored.

[0076] Optionally, the inner wall of the water collection tank 2 is equipped with an anti-clogging filter screen.

[0077] Specifically, large particles of mineral sand are intercepted by the anti-clogging filter screen to prevent blockage of the drainage pipe 3 of the water collection tank, thus ensuring smooth drainage.

[0078] In one specific embodiment of this application, nozzles 1 are arranged at equal intervals above the louvers. The nozzles 1 spray fan-shaped water mist downwards to wash away dust on the louvers. The washed wastewater falls into the collection tank 2, which is set at a certain angle. Due to gravity, the wastewater flows into the wastewater side of the circulating water tank 4 through the collection tank drain pipe 3. The wastewater on the wastewater side undergoes natural sedimentation and passes through the sand filter layer 22 (composed of quartz sand and activated carbon, etc.) to enter the clean water side. The filtered clean water is then pumped back into the nozzles 1 by the pneumatic pump 15 through the fresh water circulation pipeline 19 via the circulating water tank outlet valve 12, participating in the dust removal and cleaning cycle of the louvers.

[0079] It is important to note that the bottom of the collection tank 2 should have a certain angle of inclination to facilitate the flow of sewage into the collection tank drain pipe 3; the collection tank drain pipe 3 can be fitted with an anti-clogging filter screen depending on the environmental conditions; a sight glass 7 should be installed at the upper end of the sewage side of the circulating water tank 4; a 20% low liquid level alarm (circulating water tank float switch 11) should be installed on the clean water side to prevent the pneumatic pump 15 from running dry when the water volume is insufficient; an automatic water replenishment valve 10 and a float-type self-closing automatic water replenishment valve 6, which are normally open, should be installed on the clean water side for automatic water replenishment when the water level in the circulating water tank 4 is insufficient. A manual water replenishment valve 9, which is normally closed, is used for manual water addition in special circumstances; an overflow pipe 20 should be installed at the 90% liquid level of the circulating water tank 4 to prevent water from overflowing from the circulating water tank 4 when the water level is too high, and the overflow pipe 20 can replace the function of a high-level alarm, saving more costs compared to setting up a high-level alarm. An inspection mirror 7 should also be installed on the overflow pipe 20; the Y-type filter 13 serves as a secondary filter; the circulation pipe drain valve 18 should be installed at the lowest point of the fresh water circulation pipe 19 to drain the residual circulating fresh water in the fresh water circulation pipe 19 after loading and unloading.

[0080] Before each loading and unloading, the closed-loop water mist dust removal system checks the nozzle 1 for blockage. If it cannot produce water mist normally, it can be purged by opening the compressed air pipeline check valve 21. Before each loading and unloading, the sand filter layer 22 is checked. If the effect is not good, it should be cleaned and replaced in time. After each loading and unloading, the drain valve 5 and the drain valve 18 on the fresh water circulation pipeline 19 should be opened in time to drain the water. The liquid level sensor 8 is integrated into the bridge and the central control room to prevent insufficient manpower during the loading and unloading of the ship from making it impossible to monitor the operation status of the closed-loop water mist dust removal system.

[0081] It should be noted that the water collection tank drain pipe 3, the circulating water tank 4, the fresh water circulation pipe 19, the overflow pipe 20, and other related pipes should be made of 316L stainless steel to withstand the abrasion of mineral sand and the seawater environment.

[0082] The closed-loop water mist dust removal system is determined based on a comprehensive calculation of the area, number, and arrangement of the louvers in the fan room: the number, size, and coverage of nozzles 1; the size of the water collection tank 2; the diameter of the water collection tank drain pipe 3; the volume of the circulating water tank 4; the model of the pneumatic pump 15; and the diameter of the fresh water circulation pipeline 19.

[0083] In the above embodiment, the number, size (model), and effective coverage of nozzles 1 are determined as follows: First, the net ventilation area of ​​the louvers is calculated, denoted by S. Based on the external dimensions of each louver (length × width, denoted by L and width by W) and the occlusion rate (denoted by A, typically 30%~50%), the actual net ventilation area of ​​multiple louvers is calculated, i.e., S = ∑(L × W × (1-A)). Then, nozzles 1 are fan-shaped nozzles, with spray angles commonly 60°, 80°, and 100°. The fan-shaped water mist is required to completely cover the surface of the louvers, and the design coverage rate is typically ≥110%. Based on the required spray flow rate (denoted by q) and working pressure (denoted by P), nozzles 1 are initially selected. From the nozzle manufacturer's sample, a model of nozzle 1 with a suitable flow rate (typically around 5~20 L / min) is selected at the system's available pressure (e.g., 3~5 bar). The effective coverage width of a single nozzle (denoted by W_s, which is determined by the spray fan angle θ and the installation height h): W s =2×h×tan(θ / 2); Nozzles are arranged along the length of the louvers, with a spacing S to ensure overlapping coverage. p ≤W s ×0.8; Number of nozzles 1 N=[L total / S p ], where L total This is the total length of the venetian blinds.

[0084] In the above embodiment, the dimensions of the water collection tank 2 are determined as follows: the length of the water collection tank 2 should be slightly longer than the total length of the louvers to ensure that all flushing water can fall into the tank; the width of the water collection tank 2 is determined based on the maximum instantaneous drainage flow rate and the flow velocity within the tank; the depth of the water collection tank 2 is determined considering the water depth and structural strength, and generally needs to be ≥150mm; to ensure smooth gravity drainage, the inclination angle of the water collection tank 2 is generally designed to be 1%~3%. When all nozzles 1 are working simultaneously, the maximum drainage flow rate Q... max =N×q total , where q total The total flow rate of all nozzles 1 is given. The water flow velocity v in the tank is typically taken as 0.3~0.5 m / s. The required cross-sectional area of ​​the water passage is A. flow =Q max / v, the width W of water collection tank 2 w =A flow / h w , where h w The preset water depth for water collection tank 2.

[0085] In the above embodiment, the diameter of the drainage pipe 3 in the water collection tank is determined by considering factors such as the maximum drainage flow rate and velocity of the water collection tank 2, and the need to prevent blockage. The cross-sectional area A of the drainage pipe 3 in the water collection tank is A = πd. 2 / 4, the flow velocity inside the drain pipe 3 of the water collection tank is v1, and the maximum drainage flow rate is Q. max =N×q total =A×v1, from which the diameter of the water collection tank drain pipe 3 is solved. The calculated value is then rounded up to the standard pipe diameter.

[0086] In the above embodiment, the volume of the circulating water tank 4 is determined as follows: First, sufficient sedimentation time is provided for the wastewater to facilitate the settling of large particles. The residence time t of the wastewater on the wastewater side of the circulating water tank 4 should be ≥10~15 minutes. The sedimentation volume V on the wastewater side of the circulating water tank 4 is... sed =Q max ×t; The clean water side of the circulating water tank 4 should also retain 20% of the liquid level. The minimum total volume of the circulating water tank 4 should also include the water stored in the fresh water circulation pipe 19, nozzle 1, and water collection tank 2. Based on the above, the maximum value is taken as the minimum total volume of the circulating water tank 4.

[0087] In the above embodiment, the model of the pneumatic pump 15 is determined based on the required flow rate and head of the pneumatic pump 15 in the closed-loop water mist dust removal system. The required flow rate should be greater than Q. max The head of the pneumatic pump 15 is determined based on the working pressure of the nozzle 1, the pipe resistance of the fresh water circulation pipeline 19, and the height difference between the vertical distance from the circulating water tank 4 to the nozzle 1. A pneumatic pump 15 that meets the requirements for both flow rate and head is selected.

[0088] In the above embodiment, the diameter of the freshwater circulation pipe 19 is determined as follows: the flow velocity inside the freshwater circulation pipe 19 is v2. Applying the pipe diameter formula for the water collection tank discharge pipe 3, the diameter d2 of the freshwater circulation pipe 19 can be obtained. The calculated value is then rounded up to the standard pipe diameter.

[0089] In summary, the closed-loop water mist dust removal system for the louvers of the blower room of a bauxite ore ship provided in this application directly washes the louvers of the blower room with water mist by setting multiple nozzles 1 at equal intervals above the louvers of the blower room, which can spray fan-shaped water mist. This washes away the dust such as bauxite / ore, preventing it from directly entering the engine room. The wastewater after water mist washing is collected through the water collection tank 2 and flows into the circulating water tank 4 through the water collection tank drain pipe 3 below the water collection tank 2. The circulating water tank 4 filters the wastewater into clean water through the sand filter layer 22. The clean water is then transported to the nozzles 1 through the fresh water circulation pipeline 19, completing the closed-loop fresh water circulation and saving fresh water resources. Nozzle 1 is installed at the louver of the fan room, effectively protecting the environment of the fan room, the operation of the equipment in the nacelle, and the health of the personnel in the nacelle. The equipment and related pipelines used in this closed-loop water mist dust removal system are made of 316L stainless steel, which is resistant to abrasion from mineral sand and seawater environment, making the system components more reliable. This closed-loop water mist dust removal system is equipped with multiple inspection mirrors 7, vent valves 5, and vent valves 18 in the circulation pipeline, making it easy to operate and highly practical. The system is supplied with water from the freshwater pressure tank in the nacelle, eliminating the need for an additional water supply unit. The level sensor 8 in the circulating water tank 4 provides real-time water level information to the personnel. The system is designed to prevent accidents caused by insufficient manpower during loading and unloading. The overflow pipe 20 and the floating switch 11 (low-level alarm) of the circulating water tank also provide double protection. The compressed air purging nozzle 1 avoids manual handling of clogging and is highly efficient. The closed-loop water mist dust removal system is modular in design, which can be easily implemented in both new and converted ships at low cost. Before each loading and unloading operation, the water mist dust removal operation can be started simply by opening the corresponding valve of the fresh water pressure tank in the engine room and the pneumatic pump 15. It truly achieves "start and go" without the need to maintain circulation at all times, thus reducing operating costs.

[0090] Unless otherwise defined, all technical and scientific terms used throughout this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. In case of any inconsistency, the meaning as stated in this application or derived from the content described herein shall prevail. Furthermore, the terminology used in this description is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0091] Note that the above are merely preferred embodiments and the technical principles employed in this application. Those skilled in the art will understand that this application is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of this application. Therefore, although this application has been described in detail through the above embodiments, this application is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the technical concept of this application, all of which fall within the scope of protection of this application.

[0092] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A closed-loop water mist dust removal system for louvers in the fan room of a bauxite ore ship, characterized in that, include: Multiple nozzles (1) are arranged in multiple rows at equal intervals above the louvers of the fan room; A water collection trough (2) is located below the louvers of the fan room. The bottom inner side of the water collection trough (2) is provided with an inclined slope. The lowest end of the bottom of the water collection trough (2) is equipped with a water collection trough drain pipe (3). The circulating water tank (4) has a sand filter layer (22) inside. One side of the sand filter layer (22) is the sewage side, and the other side of the sand filter layer (22) is the clean water side. The drain pipe (3) of the water collection tank is connected to the sewage side of the circulating water tank (4) below. The clean water side of the circulating water tank (4) is equipped with a water replenishment device. A freshwater circulation pipeline (19) is connected at one end to the clean water outlet of the circulating water tank (4), and at the other end to multiple nozzles (1).

2. The closed-loop water mist dust removal system for the louvers of the fan room of a bauxite ore ship according to claim 1, characterized in that, Also includes: From the circulating water tank (4) to the plurality of nozzles (1), the fresh water circulation pipeline (19) is sequentially equipped with a circulating water tank outlet valve (12), a Y-type filter (13), a pneumatic pump inlet pressure gauge (14), a pneumatic pump (15), a pneumatic pump outlet pressure gauge (16), a pneumatic pump outlet valve (17), and a circulation pipeline vent valve (18).

3. The closed-loop water mist dust removal system for the louvers of the fan room of a bauxite ore ship according to claim 1, characterized in that, The water replenishment device includes: A float-type self-closing automatic water replenishment valve (6) is installed inside the upper part of the clear water side of the circulating water tank (4) to automatically replenish water to the clear water side of the circulating water tank (4). An automatic water replenishment valve (10) is installed on the upper outer side of the clean water side of the circulating water tank (4). The automatic water replenishment valve (10) is kept in a normally open state to automatically replenish water to the clean water side of the circulating water tank (4). A manual water replenishment valve (9) is installed on the outside of the clean water side of the circulating water tank (4), and the manual water replenishment valve (9) is arranged in parallel above the automatic water replenishment valve (10) for manually replenishing water to the clean water side of the circulating water tank (4).

4. The closed-loop water mist dust removal system for the louvers of the fan room of a bauxite ore ship according to claim 3, characterized in that, The bottom of the circulating water tank (4) is provided with a drain valve (5) on the sewage side and the clean water side respectively. The wastewater side of the circulating water tank (4) is equipped with a sight glass (7) and a liquid level sensor (8). The circulating water tank (4) is equipped with a circulating water tank float switch (11) on the clear water side, which is located at 20% liquid level height on the clear water side of the circulating water tank (4).

5. The closed-loop water mist dust removal system for the louvers of the fan room of a bauxite ore ship according to claim 2, characterized in that, On the freshwater circulation pipeline (19), near the side of the plurality of nozzles (1), a compressed air pipeline check valve (21) is installed. The compressed air pipeline check valve (21) is connected to the cabin compressed air system for use in reverse purging cleaning with compressed air when the nozzles (1) are blocked.

6. The closed-loop water mist dust removal system for the louvers of the fan room of a bauxite ore ship according to claim 4, characterized in that, An overflow pipe (20) is provided on the upper outer side of the clear water side of the circulating water tank (4). The inlet of the overflow pipe (20) is located at 90% liquid level on the clear water side of the circulating water tank (4), and the outlet of the overflow pipe (20) is connected to the bilge water tank.

7. The closed-loop water mist dust removal system for the louvers of the fan room of a bauxite ore ship according to claim 2, characterized in that, The ring pipeline relief valve (18) is installed at the lowest point of the freshwater circulation pipeline (19).

8. The closed-loop water mist dust removal system for the louvers of the fan room of a bauxite ore ship according to claim 1, characterized in that, The inner wall of the water collection tank (2) is equipped with an anti-clogging filter screen.

9. The closed-loop water mist dust removal system for the louvers of the fan room of a bauxite ore ship according to claim 6, characterized in that, The inspection mirror (7) is installed on the overflow pipe (20).

10. The closed-loop water mist dust removal system for the louvers of the fan room of a bauxite ore ship according to claim 4, characterized in that, The signal output terminal of the liquid level sensor (8) is connected to the monitoring system of the ship's bridge or central control room.

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