Ventilation mast suitable for ammonia fuel powered ship

Abstract

A ventilation mast suitable for an ammonia fuel powered ship is characterized in that a combined ventilation mast is composed of a main ventilation mast body and two sets of auxiliary ventilation mast bodies, the two sets of auxiliary ventilation mast bodies are the first auxiliary ventilation mast body set and the second auxiliary ventilation mast body set respectively, the first auxiliary ventilation mast body set is composed of a plurality of first auxiliary ventilation mast bodies, and the second auxiliary ventilation mast body set is composed of a plurality of second auxiliary ventilation mast bodies; the number of the first auxiliary ventilation masts is the same as that of the second auxiliary ventilation masts, the multiple first auxiliary ventilation masts and the multiple second auxiliary ventilation masts are alternately arranged in the circumferential direction of the main ventilation mast, the heights of the multiple first auxiliary ventilation masts are sequentially reduced, the heights of the multiple second auxiliary ventilation masts are sequentially reduced, and in the first auxiliary ventilation mast set, the first auxiliary ventilation mast with the lowest height is higher than the second auxiliary ventilation mast with the lowest height. And in the second auxiliary ventilation mast group, the height is higher than that of the second auxiliary ventilation mast with the highest height. The staggered lowering mode helps all the auxiliary air outlets to be staggered to the maximum degree in height and angle, so that secondary diffusion of toxic areas caused by pressure difference among all the ventilation pipelines when ammonia gas leaks is avoided.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of offshore ship design and construction, and particularly relates to a ventilating mast suitable for an ammonia fuel power ship. BACKGROUND

[0002] With the increasing emphasis on environmental protection, the requirement for CO2 emission is continuously improved. Compared with LNG and methanol which still contain carbon, ammonia is highly expected as a zero-carbon fuel. However, ammonia has a fatal defect, i.e. it is toxic. Therefore, the ventilation arrangement of the ammonia fuel power ship is extremely important.

[0003] The ventilation of the working room of a conventional ship is generally performed by local ventilation. However, due to the toxicity of ammonia fuel, a toxic area will be generated within a certain range of the air outlet of each room (such as an ammonia fuel storage cabin, an ammonia fuel preparation room, etc.) that can generate ammonia leakage. If the working room that can generate ammonia leakage still uses local ventilation, the range of the toxic area will be greatly increased, resulting in that the personnel cannot normally pass and work on the ship. If the ventilation of these rooms is converged (a ventilating mast), when ammonia leakage occurs in a room, the ammonia gas will flow to the ventilating mast through the ventilation pipeline. However, the pressure difference at the ventilation convergence position will cause the backflow of the air in the low-pressure room, so that the leaked ammonia will flow into the room without ammonia leakage through the ventilating mast and the air duct, which will cause a great threat to the safety of the crew. SUMMARY

[0004] The present application provides a ventilating mast suitable for an ammonia fuel power ship, which aims to solve the ventilation problem of the working room that can generate ammonia leakage, avoid the large-area toxic area generated by local ventilation or the design of multiple enhanced and increased ventilation, ensure the safety of the personnel, reduce the visual obstructions, save the steel material, facilitate the maintenance, and reduce the number of dangerous sources in the ammonia diffusion analysis, so that the personnel can still safely enter the working room for repair and normal work when ammonia leakage occurs. The technical scheme adopted by the present application is as follows.

[0005] The ventilating mast suitable for the ammonia fuel power ship is fixed on the main deck, and is composed of a main ventilating mast and two groups of auxiliary ventilating masts. The main ventilating mast is located at the center, and the two groups of auxiliary ventilating masts are circumferentially arranged around the main ventilating mast.

[0006] The two groups of auxiliary ventilating masts are a first auxiliary ventilating mast group and a second auxiliary ventilating mast group. The first auxiliary ventilating mast group is composed of a plurality of first auxiliary ventilating masts, and the second auxiliary ventilating mast group is composed of a plurality of second auxiliary ventilating masts. The number of the first auxiliary ventilating masts is the same as that of the second auxiliary ventilating masts. The plurality of first auxiliary ventilating masts and the plurality of second auxiliary ventilating masts are alternately arranged circumferentially on the main ventilating mast. The heights of the plurality of first auxiliary ventilating masts decrease in sequence, and the heights of the plurality of second auxiliary ventilating masts decrease in sequence. In the first auxiliary ventilating mast group, the height of the lowest first auxiliary ventilating mast is higher than that of the highest second auxiliary ventilating mast in the second auxiliary ventilating mast group.

[0007] The main ventilation mast is connected with the room with large ammonia leakage amount, the first auxiliary ventilation mast group is connected with the room with small ammonia leakage amount on one side of the ship, and the second auxiliary ventilation mast group is connected with the room with small ammonia leakage amount on the other side of the ship.

[0008] The bottom of the main ventilation mast is provided with an anti-fouling net which is bolted with the inner wall of the main ventilation mast, and a cleaning hole is formed in the mast wall above the anti-fouling net.

[0009] The ventilation mast suitable for the ammonia fuel power ship is further provided with auxiliary ventilation pipelines in the first auxiliary ventilation mast and the second auxiliary ventilation mast, the main ventilation mast is connected with the main ventilation pipeline through a connecting pipeline, and the first auxiliary ventilation mast and the second auxiliary ventilation mast are connected with the auxiliary ventilation pipeline through a connecting pipeline.

[0010] The ventilation mast suitable for the ammonia fuel power ship is further provided with a first auxiliary ventilation mast or a second auxiliary ventilation mast connected with each room with small ammonia leakage amount, and the room with small ammonia leakage amount is an ammonia fuel preparation room, an ammonia water collecting cabinet, a filling station and a TCS room.

[0011] The ventilation mast suitable for the ammonia fuel power ship is further provided with a room with large ammonia leakage amount, which is an ammonia fuel storage cabin.

[0012] The ventilation mast suitable for the ammonia fuel power ship is further provided with a maintenance passage, and each first auxiliary ventilation mast and second auxiliary ventilation mast is provided with a maintenance platform connected with the maintenance passage.

[0013] The ventilation mast suitable for the ammonia fuel power ship is further provided with a first auxiliary ventilation mast in the first auxiliary ventilation mast group which is 1-4 meters lower than the main ventilation mast, and a second auxiliary ventilation mast in the second auxiliary ventilation mast group which is 1-4 meters lower than the lowest first auxiliary ventilation mast in the first auxiliary ventilation mast group.

[0014] The ventilation mast suitable for the ammonia fuel power ship is further provided with a wind cap head on the top of the main ventilation mast, the first auxiliary ventilation mast and the second auxiliary ventilation mast.

[0015] The ventilation mast suitable for the ammonia fuel power ship is further provided with an alarm instrument and a water spraying device in the wind cap head.

[0016] The ventilation mast suitable for the ammonia fuel power ship is further provided with an ammonia water collecting cabinet at the bottom of the ventilation mast.

[0017] The ventilation mast suitable for the ammonia fuel power ship is further provided with an integrated structure frame connected with the ammonia fuel preparation room and the ammonia fuel storage cabin at the bottom of the ventilation mast.

[0018] The ventilation mast suitable for the ammonia fuel power ship is further provided with an integrated structure frame connected with the ammonia fuel preparation room and the ammonia fuel storage cabin at the bottom of the ventilation mast.

[0019] 1. The traditional air breather mast has only one main mast, but when encountering toxic gas, if the ventilation of each room converges in one place, it will cause the ventilation to flow backward due to negative pressure, that is, the air in one room flows to other rooms through the air breather mast, causing secondary diffusion of toxic gas, the combined air breather mast surrounds the main pipeline by the method of spiral staggered lowering of multiple auxiliary ventilation pipelines, solves the problem that too many toxic areas of ammonia fuel ships cannot meet the safety ventilation, and completely avoids the problem of secondary diffusion of gas.

[0020] 2. The maintenance channel and the maintenance platform structure are designed skillfully, so that the maintenance function is provided while the structure support is provided, and the main and auxiliary ventilation openings are constrained.

[0021] 3. The design of the rotatable cap on the main ventilation opening helps the toxic gas in the air breather mast to be quickly discharged by external wind force, and the direction of the exhaust gas is controlled to make the toxic gas away from the living building.

[0022] 4. The gas detection installed in the cap helps to identify toxic gas, helps the crew to discover the danger and discharge toxic gas as soon as possible, and enhances the safety.

[0023] 5. The water spraying device and the ammonia water collection cabinet installed in the cap reduce the amount of toxic gas discharged into the atmosphere at the same time, protect the marine and air environment, and enhance the environmental protection.

[0024] 6. The use of the ammonia fuel power ship of the present application not only reduces the ship's light weight, but also improves the ship's appearance, economy and safety.

[0025] 7. The bottom of the air breather mast is provided with a detachable anti-pollution grid and an opening for easy cleaning of debris, so as to prevent debris from accidentally falling into the air breather mast and causing blockage. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural schematic diagram of the present application;

[0027] Figure 2 is a top view structural schematic diagram of the combined air breather mast;

[0028] Figure 3 is a structural schematic diagram of the anti-pollution net at the bottom of the air breather mast;

[0029] Figure 4 is a structural schematic diagram of the cap head;

[0030] Among them, 1-first ventilated mast, 2-second ventilated mast, 3-no. 3 ventilated mast, 4-no. 4 ventilated mast, 5-no. 5 ventilated mast, 6-no. 6 ventilated mast, 7-main ventilated mast, 8-maintenance passage, 9-maintenance platform, 10-integrated structural frame, 11-ventilated hood head, 12-ammonia fuel preparation room, 13-filling station, 14-TCS room, 15-ammonia fuel storage tank, 16-ammonia water collection cabinet, a1, a2, b1, b2, b3, b4, b5, b6-ventilation ducts, 17-antifouling net, 18-cleaning hole. Detailed Implementation

[0031] The invention will be further described with reference to the accompanying drawings.

[0032] like Figure 1 As shown, a permeable mast suitable for ammonia-fueled ships is a modular permeable mast vertically constructed above the main deck, with an overall height of 10-28 meters. The permeable mast consists of a main permeable mast (7) and two sets of auxiliary permeable masts arranged circumferentially around it, designated as the first and second auxiliary mast groups. The first auxiliary mast group comprises three first auxiliary masts: mast 1, mast 3, and mast 5. The second auxiliary mast group comprises three second auxiliary masts: mast 2, mast 4, and mast 6. Next to the modular permeable mast, a maintenance access road extends from the deck directly to the top of the mast. Each first and second auxiliary mast has a maintenance platform at its vent, and the access road passes through these platforms. The access road is equipped with safety railings to protect personnel. The maintenance access is usually located near the bow side of the ship and avoids all air vent directions. The maintenance access is built on the outside of the maintenance platform, and the two support each other. The structural design of the maintenance access also has the function of protecting and fixing the secondary ventilation vents.

[0033] At the bottom of the ventilated mast, there is an integrated structural frame that connects to the ammonia fuel preparation room, ammonia water collection cabinet, and ammonia fuel storage tank. While providing structural support for the ventilated mast, it saves some maintenance access and provides access to the TCS room at the top of the ammonia fuel preparation room and ammonia fuel storage tank, making it convenient for maintenance personnel to move between them. It also saves steel and layout space, and has good aesthetics and practicality.

[0034] like Figure 2 As shown, the main ventilated mast is located in the center, and three first-level ventilated masts and three second-level ventilated masts are alternately arranged around the main ventilated mast. The heights of ventilated masts No. 1, No. 3, and No. 5 decrease sequentially, as do the heights of ventilated masts No. 2, No. 4, and No. 6. In the first-level ventilated mast group, the height of ventilated mast No. 1 is less than the height of the main ventilated mast, and the height of ventilated mast No. 5 is greater than the height of ventilated mast No. 2.

[0035] The main vent mast is connected with the room with large ammonia leakage amount, the first auxiliary vent mast group is connected with the room with small ammonia leakage amount on one side of the ship, the second auxiliary vent mast group is connected with the room with small ammonia leakage amount on the other side of the ship, and the room with small leakage amount includes the TCS room, the filling station, the ammonia fuel preparation room and the ammonia water collection cabinet. The top air outlet of the main vent mast and the first auxiliary vent mast and the second auxiliary vent mast is provided with a wind cap head, which plays a role of preventing rain and guiding flow. Figure 4 As shown in the figure, the water spraying device is arranged in the wind cap head, the wind cap head can rotate in real time according to the analysis result provided by the anemorumbus, the air outlet direction is consistent with the outside environment wind direction, the ammonia gas is discharged at the fastest speed, and the ammonia gas is prevented from flowing into the living building. Ammonia is easily dissolved in water, when the alarm instrument detects that the ammonia concentration of the air outlet reaches the dangerous critical value, the water spraying device is started to absorb the ammonia gas. The bottom of the vent mast is provided with an ammonia water collection cabinet to collect the toxic ammonia water.

[0036] The main vent mast body is a through circular pipe from top to bottom, the main vent mast is fixed on the main deck, the main vent mast is provided with a main vent pipe, the first auxiliary vent mast and the second auxiliary vent mast are provided with auxiliary vent pipes, the main vent mast is connected with the main vent pipe through a connecting pipe, the first auxiliary vent mast and the second auxiliary vent mast are connected with the auxiliary vent pipe through a connecting pipe. The main vent mast is connected with the ammonia fuel storage cabin through the connecting pipe, the ship is provided with one or more ammonia fuel storage cabins, the ammonia fuel storage cabin is provided with a local ventilation device such as an exhaust valve, when the ammonia fuel storage cabin is overpressure (ammonia changes from liquid to gas, the volume increases, and the pressure in the ammonia fuel storage cabin increases), the ammonia gas is connected to the main ventilation pipe through the connecting pipe, then connected to the main vent mast through the main ventilation pipe, and finally discharged to the outside through the wind cap head. All other ammonia fuel storage cabins are connected to the main ventilation pipe through the connecting pipe, so that all ammonia fuel storage cabins can be ventilated through the main vent mast.

[0037] One TCS room and one filling station are arranged on each side of the ship, the TCS room and the filling station on one side of the ship are connected with the first auxiliary vent mast group, and the TCS room and the filling station on the other side of the ship are connected with the second auxiliary vent mast group. The TCS room and the filling station are provided with local air outlet devices such as exhaust fans, and the TCS room and the filling station are provided with local air inlet devices such as air inlet fans at the top, the outside air flows into the local air inlet device and flows out of the local air outlet device, then is connected to the auxiliary ventilation pipe of the vent mast through the connecting pipe, and finally is discharged to the outside from the top end of the auxiliary ventilation pipe, so as to achieve the purpose of ventilating the TCS room.

[0038] All the above rooms are air-tight except the local air inlet and outlet devices. The air inlet and outlet devices are connected with the room structure through air-tight flanges (or other air-tight connecting pieces), so that the room can only be ventilated through the air inlet and outlet devices.

[0039] The outflow of the No. 1 ventilation mast is 1 height difference lower than the main outflow, and the height difference is about 1-4 meters (the height difference depends on the number of auxiliary ventilation outlets and the height of the main ventilation outlet); the outflow of the No. 3 ventilation mast is 1 height difference lower than the outflow of the No. 1 ventilation mast; the outflow of the No. 5 ventilation mast is 1 height difference lower than the outflow of the No. 3 ventilation mast; the outflow of the No. 2 ventilation mast is 1 height difference lower than the outflow of the No. 5 ventilation mast; the outflow of the No. 4 ventilation mast is 1 height difference lower than the outflow of the No. 2 ventilation mast; and the outflow of the No. 6 ventilation mast is 1 height difference lower than the outflow of the No. 4 ventilation mast. According to the relevance, importance and leakage probability of each room connected by the ventilation pipe of the ventilation mast, the matching of the ventilation pipe and the room is selected. The No. 7 ventilation mast is connected with the ammonia fuel storage cabin on both sides of the ship through the ventilation pipe a1 and the ventilation pipe a2, the No. 1 ventilation mast is connected with the TCS room on one side of the ship through the ventilation pipe b1, the No. 2 ventilation mast is connected with the TCS room on the other side of the ship through the ventilation pipe b2, the No. 3 ventilation mast is connected with the ammonia fuel preparation room on one side of the ship through the ventilation pipe b3, the No. 4 ventilation mast is connected with the ammonia water collection cabinet on the other side of the ship through the ventilation pipe b4, the No. 5 ventilation mast is connected with the filling station on one side of the ship through the ventilation pipe b5, and the No. 6 ventilation mast is connected with the filling station on the other side of the ship through the ventilation pipe b6.

[0040] This staggered reduction helps the various auxiliary outflows to be maximally staggered in height and angle, so as to avoid the secondary diffusion of the toxic area between the various ventilation pipes due to the pressure difference when ammonia gas leaks.

[0041] As shown in Figure 3 The bottom of the main ventilation mast is provided with an anti-fouling net which is bolted with the inner wall of the main ventilation mast, and a cleaning hole is opened in the mast wall above the anti-fouling net. At the height where the ventilation mast meets the main deck, a detachable anti-fouling grid is arranged in the ventilation mast to prevent solid impurities in the external environment from causing blockage of the ventilation mast. Considering the corrosiveness of ammonia, the anti-fouling grid is made of ammonia-resistant material. Considering that long-time attachment of oil stains on the grid may also cause blockage of the ventilation mast, the grid is detachable. A tight opening is arranged in the side wall of the ventilation mast above the grid to facilitate cleaning of the blockage or oil stains on the grid.

[0042] It should be noted that at the positions where all the main ventilation pipes, auxiliary ventilation pipes and connecting pipes of the ventilation mast are connected, they are connected through air-tight flanges (or other air-tight connecting pieces) to ensure that the gas in the pipes cannot leak outside the connection, but can only be discharged through the ventilation mast. Anti-back valves are arranged at the top of all the main ventilation masts and auxiliary ventilation masts to cooperate with the staggered spiral reduction of the ventilation outlet height difference to ensure no backflow risk.

Claims

1. A permeable mast suitable for ammonia-fueled ships, characterized in that, The modular ventilated mast is fixed on the main deck. It consists of a main ventilated mast and two sets of auxiliary ventilated masts. The main ventilated mast is located in the center, and the two sets of auxiliary ventilated masts are arranged around the main ventilated mast. The two sets of auxiliary ventilation masts are the first ventilation mast group and the second ventilation mast group. The first ventilation mast group consists of multiple first ventilation masts, and the second ventilation mast group consists of multiple second ventilation masts. The number of first ventilation masts and the number of second ventilation masts are the same. Multiple first ventilation masts and multiple second ventilation masts are alternately arranged around the circumference of the main ventilation mast. The height of multiple first ventilation masts decreases in sequence, and the height of multiple second ventilation masts decreases in sequence. In the first ventilation mast group, the lowest first ventilation mast is higher than the highest second ventilation mast in the second ventilation mast group. The main vent mast is connected to the room with the highest ammonia leakage rate, the first vent mast assembly is connected to the room on one side of the ship with the lowest ammonia leakage rate, and the second vent mast assembly is connected to the room on the other side of the ship with the lowest ammonia leakage rate. A dirt-proof net is installed at the bottom of the main ventilator, and the dirt-proof net is bolted to the inner wall of the main ventilator. Cleaning holes are opened on the mast wall above the dirt-proof net.

2. A ventilated mast suitable for ammonia-fueled ships according to claim 1, characterized in that, The main ventilated mast is equipped with a main ventilated pipe, and the first and second auxiliary ventilated masts are equipped with auxiliary ventilated pipes. The main ventilated mast is connected to the main ventilated pipe via a connecting pipe, and the first and second auxiliary ventilated masts are connected to the auxiliary ventilated pipes via connecting pipes.

3. A ventilated mast suitable for ammonia-fueled ships according to claim 1, characterized in that, Each room with a small ammonia leakage is connected to a first or second venting mast. Rooms with small ammonia leakage include the ammonia fuel preparation room, ammonia water collection tank, refueling station, and TCS room.

4. A ventilated mast suitable for ammonia-fueled ships according to claim 1, characterized in that, The room with the largest ammonia leak is the ammonia fuel storage tank.

5. A ventilated mast suitable for ammonia-fueled ships according to claim 1, characterized in that, The modular ventilated mast is also equipped with a maintenance passage. Each first and second ventilated mast is equipped with a maintenance platform, which is connected to the maintenance passage.

6. A ventilated mast suitable for ammonia-fueled ships according to claim 1, characterized in that, The tallest first ventilated mast in the first ventilated mast group is 1-4 meters lower than the main ventilated mast, and the tallest second ventilated mast in the second ventilated mast group is 1-4 meters lower than the shortest first ventilated mast in the first ventilated mast group.

7. A ventilated mast suitable for ammonia-fueled ships according to claim 1, characterized in that, The main ventilated mast, the first ventilated mast, and the second ventilated mast are equipped with hoods at their tops.

8. A ventilated mast suitable for ammonia-fueled ships according to claim 7, characterized in that, The hood is equipped with an alarm and a water spray device.

9. A ventilated mast suitable for ammonia-fueled ships according to claim 1, characterized in that, An ammonia collection tank is installed at the bottom of the ventilated mast.

10. A ventilated mast suitable for ammonia-fueled ships according to claim 1, characterized in that, The bottom of the ventilated mast is equipped with an integrated structural frame that connects to the ammonia fuel preparation room and the ammonia fuel storage tank.

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