A method of ventilating a ballast tank of a semi-submersible vessel

Abstract

The present application belongs to the technical field of shipbuilding, and particularly relates to a ventilation method for a semi-submersible ship ballast tank. The ventilation method comprises the following steps: during the ship dock construction process, when the bottom ballast tank is shaped and a closed space is formed, air is sent into the space through a first ventilation hole on the outer bottom plate by using a air supply device, and air is extracted through a second ventilation hole of the double bottom plate by using an air extraction device, so that convection is formed. With the ship body shaping, air is continuously supplied through the first ventilation hole, and air extraction devices are arranged in each ballast tank, and regional air convection is realized through manholes. After the construction is completed, the relevant ventilation holes are closed, so that the ballast tanks form a closed state, and the smoke and harmful gases are effectively removed by accurately controlling the air supply and air extraction. The ventilation scheme of different construction stages is formulated, the ventilation flow direction is clear, the temporary work holes, the permanent manholes, the air supply device and the air extraction device are used, and the ballast tank is ventilated and exchanged, so that the construction environment is improved, and the construction operation efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of shipbuilding, and in particular relates to a ventilation method for a semi-submersible ship ballast tank. BACKGROUND

[0002] Semi-submersible ships are widely used in marine transportation, deep sea exploration and military fields due to their unique design and functions. This type of ship has multiple ballast tanks, which are usually located at the bottom, middle and top of the main hull, penetrating the upper, middle and lower three layers. During the construction of the ship, the ballast tank often has poor ventilation due to its closed space characteristics, which directly affects the safety and efficiency of construction.

[0003] The traditional ventilation method mainly uses air supply and exhaust equipment on the liquid tank deck and the main deck, and air flows through the manholes and passages of the ballast tank. However, this method has several significant problems:

[0004] 1. The ventilation flow direction is not clear, resulting in unsatisfactory ventilation effect and affecting the air quality of the construction environment.

[0005] 2. The arrangement of the ventilation device during construction is not clear, and the temporary process holes and passage holes are not effectively utilized, resulting in insufficient ventilation of the ballast tank and increasing the additional workload and time cost during construction.

[0006] In addition, since smoke and harmful gases may accumulate inside the ballast tank, not only does it pose a threat to the health of construction personnel, but it also may violate safety regulations, affecting the construction quality and safety of the ship. Therefore, developing an efficient ballast tank ventilation method to improve the construction work environment and ensure the health and safety of construction personnel has become an important requirement in shipbuilding. SUMMARY

[0007] (I) Technical problems to be solved

[0008] The present application mainly aims at the above problems and proposes a ventilation method for a semi-submersible ship ballast tank, which aims to solve the problems of low ventilation efficiency and insufficient safety of the construction environment in the existing ventilation scheme.

[0009] (II) Technical solutions

[0010] To achieve the above purpose, the first aspect of the present application provides a ventilation method for a semi-submersible ship ballast tank, which comprises the following steps:

[0011] During the construction of the dock, when the bottom ballast tank is initially shaped and forms a closed space, an air supply device is used to send air into the bottom ballast tank through a first ventilation hole pre-set on the outer bottom plate, while an air exhaust device is arranged at a second ventilation hole of the double bottom plate to exhaust the air in the bottom ballast tank, so that the air inside the bottom ballast tank forms a convection.

[0012] Continuing the progress of the dock construction, when the bottom ballast tank, the middle ballast tank and the top ballast tank gradually form a closed space, the air supply device is used to continue to send air into the first ventilation hole of the outer bottom plate; the air exhaust device is arranged at the permanent manhole on the main deck, the third ventilation hole is arranged at the top of the middle ballast tank, and the air exhaust device is used to exhaust the bottom ballast tank, the middle ballast tank and the top ballast tank, so that the air in the bottom ballast tank, the middle ballast tank and the top ballast tank forms a convection;

[0013] After the bottom ballast tank is constructed, all the first ventilation holes and the second ventilation holes of the bottom ballast tank are closed to form a completely closed state of the bottom ballast tank; the middle ballast tank and the top ballast tank are continuously constructed; the air exhaust device is arranged at the permanent manhole of the main deck to exhaust the middle ballast tank and the top ballast tank; wherein, during the use of the air exhaust device, air is sent into the permanent manhole of the middle ballast tank passage to form air convection in the middle ballast tank and the top ballast tank;

[0014] When the middle ballast tank has been constructed, all the third ventilation holes are closed to form a completely closed state of the middle ballast tank; the top ballast tank is continuously constructed, and the air exhaust device and the air supply device are arranged at the permanent manhole of the main deck outside the top ballast tank, one of which is used to exhaust the air in the top ballast tank, and the other is used to send fresh air, so that the air in the top ballast tank forms a convection.

[0015] Further, the air supply device is a blower.

[0016] Further, the air exhaust device is an exhaust fan.

[0017] Further, the air supply device and the air exhaust device are both provided with a speed regulator for adjusting the air volume and the air speed according to the construction environment.

[0018] Further, the ventilation method further comprises a wind channel integrity and sealing inspection before each construction stage.

[0019] Further, the ventilation method further comprises using an air quality monitoring device to monitor the air quality in the ballast tank in real time during the ventilation process.

[0020] Further, the ventilation method further comprises using an air purification device during the ventilation process.

[0021] Further, the ventilation method further comprises setting a multi-point temperature and humidity sensor inside the ballast tank to monitor the environmental changes in each area.

[0022] (Three) beneficial effects

[0023] Compared with the prior art, the ventilation method for the ballast tank of the semi-submersible ship provided by the application significantly improves the ventilation efficiency and the safety of the construction environment through the precise and systematic layout of the ventilation holes and devices and the phased ventilation strategy. The method ensures the effective circulation and convection of air inside the ballast tank through targeted air supply and air extraction operations at different construction stages, thereby effectively eliminating smoke and harmful gases. In addition, by timely closing and opening certain ventilation holes, the application optimizes the ventilation path, reduces redundant operations and energy waste, while ensuring the air quality during construction and meeting the requirements of safe production. This orderly and segmented ventilation method not only improves the ventilation effect, but also further protects the health of construction personnel by improving the working environment, thereby improving the overall efficiency and quality of shipbuilding. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 A ventilation method for the bottom ballast tank forming stage disclosed by the application.

[0025] Figure 2 A ventilation method for the main hull forming stage of the dock construction disclosed by the application.

[0026] Figure 3 A ventilation method for the bottom ballast tank completion stage of the dock construction disclosed by the application.

[0027] Figure 4 A ventilation method for the middle ballast tank completion stage of the dock construction disclosed by the application.

[0028] Reference signs shown in the figure: 100, bottom ballast tank; 200, middle ballast tank; 300, top ballast tank; 10, air supply device; 11, outer bottom plate; 12, first ventilation hole; 13, double bottom plate; 14, second ventilation hole; 15, air extraction device; 16, main deck; 17, permanent manhole; 18, third ventilation hole; 19, passage. DETAILED DESCRIPTION

[0029] The application will be described in detail below with reference to the accompanying drawings, and the technical solutions in the embodiments of the application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the application.

[0030] Please refer to Figures 1-4As shown, the embodiment provides a ventilation method for semi-submersible ship ballast tank, for the closed ballast tank space formed during the ship construction process, using the air exhaust device 15 and air supply device 10, through the permanent manhole 17 of the ship and the first ventilation hole 12, the second ventilation hole 14 and the third ventilation hole 18, the ballast tank is ventilated to improve the construction environment, improve the work efficiency and ensure the health of the workers, the method includes the bottom ballast tank forming stage, the dock construction main hull forming stage, the wharf construction bottom ballast tank completion stage and the wharf construction middle ballast tank completion stage.

[0031] The bottom ballast tank forming stage: when the bottom ballast tank 100 is initially formed and a closed space is formed, the air supply device 10 is used to send air into the bottom ballast tank 100 through the first ventilation hole 12 on the outer bottom plate 11, and at the same time, the air exhaust device 15 is arranged at the second ventilation hole 14 of the double bottom plate 13 to exhaust the air in the bottom ballast tank 100, so that the air in the bottom ballast tank 100 forms a convection, as shown by the arrows. Figure 1

[0032] The dock construction main hull forming stage: continue to promote the dock construction, when the bottom ballast tank 100, the middle ballast tank 200 and the top ballast tank 300 gradually form a closed space, the air supply device 10 is used to continue to send air into the bottom ballast tank 100 through the first ventilation hole 12 of the outer bottom plate 11; the air exhaust device 15 is arranged at the permanent manhole 17 on the main deck 16, and the third ventilation hole 18 is arranged at the top of the middle ballast tank 200, and the air exhaust device 15 is used to exhaust the air in the bottom ballast tank 100, the middle ballast tank 200 and the top ballast tank 300, so that the air in the bottom ballast tank 100, the middle ballast tank 200 and the top ballast tank 300 forms a convection, as shown by the arrows. Figure 2

[0033] The wharf construction bottom ballast tank completion stage: after the bottom ballast tank 100 is completed, all the first ventilation holes 12 and the second ventilation holes 14 of the bottom ballast tank 100 are closed, so that the bottom ballast tank 100 forms a completely closed state; continue to construct the middle ballast tank 200 and the top ballast tank 300; the air exhaust device 15 is arranged at the permanent manhole 17 on the main deck 16 to exhaust the air in the middle ballast tank 200 and the top ballast tank 300; during the use of the air exhaust device 15, air is sent into the middle ballast tank 200 and the top ballast tank 300 through the permanent manhole 17 of the passage 19, so that the air in the middle ballast tank 200 and the top ballast tank 300 forms a convection, as shown by the arrows. Figure 3

[0034] ​​​Port construction completion stage of the intermediate ballast tank: After the intermediate ballast tank 200 has been constructed, all third ventilation holes 18 are closed, making the intermediate ballast tank 200 completely sealed; continue to construct the top ballast tank 300, and arrange the air extraction device 15 and the air supply device 10 outside the main deck 16 of the top ballast tank 300 through the permanent manhole 17, one for extracting air inside the top ballast tank, and the other for supplying fresh air, so that the air inside the top ballast tank 300 forms a convection, as shown in Figure 4

[0035] The semi-submersible ship ballast tank ventilation method of the embodiment significantly improves the ventilation effect and construction environment in the ballast tank by implementing orderly and specialized ventilation measures for different construction stages. During the formation of each sealed ballast tank, the air supply device 10 and the air extraction device 15 are used in a timely manner to ensure continuous air circulation and convection, effectively eliminating smoke and harmful gases. This precise ventilation strategy not only improves work efficiency and reduces construction risks, but also helps protect the health of construction personnel and ensures safety during the construction process. By setting the first ventilation hole 12, the second ventilation hole 14, the third ventilation hole 18, and the permanent manhole 17 at key periods and positions, this method optimizes the ventilation path, reduces energy waste, and significantly improves the process quality and efficiency of the entire construction process.

[0036] In this embodiment, the air supply device 10 uses a blower, and the air extraction device 15 uses an exhaust fan. Of course, this embodiment is not limited to the air supply device 10 being a blower and the air extraction device 15 being an exhaust fan. Both devices are equipped with speed regulators. This configuration allows for flexible adjustment of air volume and air speed according to specific construction environment needs, ensuring optimal ventilation efficiency inside the ballast tank. By adjusting the speed of the blower and the exhaust fan, air flow inside the ballast tank can be more precisely controlled, effectively addressing the needs of different environmental conditions and construction stages, ensuring that the air quality of the construction site meets safety standards, while improving construction efficiency and the safety of workers.

[0037] In the semi-submersible ship ballast tank ventilation method of the invention, a step is added to check the integrity and sealing of the air duct before each construction stage begins. By checking the integrity and sealing of the air duct, any potential air leakage or contamination problems can be prevented and promptly repaired, ensuring the efficiency of the air supply and extraction equipment.

[0038] ​In the semi-submersible ship ballast tank ventilation method of the present application, the environmental monitoring and control functions are further enhanced, including using air quality monitoring devices to monitor the air quality in the ballast tank in real time, using air purification devices to improve ventilation effect, and setting up multi-point temperature and humidity sensors inside the ballast tank to monitor the environmental changes in each area. The air quality monitoring device can detect the levels of harmful gases and particulate matter in real time, and adjust the ventilation and purification strategy in a timely manner. The air purification device effectively removes pollutants in the air and keeps the air clean. The arrangement of multi-point temperature and humidity sensors allows detailed monitoring of the micro-environment of the ballast tank, so as to adjust the ventilation equipment according to environmental changes.

[0039] Since the present application provides a ventilation method for semi-submersible ship ballast tank, which fully considers the layout characteristics of semi-submersible ship ballast tank and the physical properties of smoke rising, and effectively realizes the convection of air in the ballast tank by equipping with exhaust and air supply devices, thereby significantly improving the construction operation environment and ensuring the health and safety of the operation personnel. As a high value-added product, the cabin ventilation of semi-submersible ship is a key process in shipbuilding. By implementing the ventilation method of the present application, not only the core technical competitiveness of the company in the field of high-end marine equipment and ship product construction is improved, but also valuable experience is accumulated, and the overall construction level and market competitiveness of the enterprise are further improved. This ventilation method ensures high efficiency and safety during construction by effectively supplying fresh air and discharging smoke and harmful gases, which effectively supports the company in undertaking and implementing high-tech projects.

[0040] Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the application is defined by the attached claims and not by the above description, therefore all variations falling within the meaning and scope of the essential elements of the claims are intended to be included in the application. Any reference signs in the claims should not be considered as limiting the claims involved. Furthermore, it is clear that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. The words first, second, etc. are used to indicate names and not any particular order.

[0041] The above embodiments are only used to illustrate the technical solutions of the present application and not to limit the present application, although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A method of ventilating a ballast tank of a semi-submersible vessel, characterized in that, The ventilation method comprises the following steps: During the dock construction process, when the bottom ballast tank is initially shaped and forms a closed space, the air is sent into the bottom ballast tank through the first ventilation hole of the outer bottom plate by using the air supply device, and the air in the bottom ballast tank is extracted through the second ventilation hole of the double bottom plate by using the air extraction device, so that the air in the bottom ballast tank forms a convection; When the bottom ballast tank, the middle ballast tank and the top ballast tank gradually form closed spaces, the air is continuously sent into the bottom ballast tank through the first ventilation hole of the outer bottom plate by using the air supply device, the air extraction device is arranged at the permanent manhole on the main deck, the third ventilation hole is arranged at the top of the middle ballast tank, and the air extraction device is used to extract the air in the bottom ballast tank, the middle ballast tank and the top ballast tank, so that the air in the bottom ballast tank, the middle ballast tank and the top ballast tank forms a convection; After the bottom ballast tank is constructed, all the first ventilation holes and the second ventilation holes of the bottom ballast tank are closed, so that the bottom ballast tank forms a completely closed state; the middle ballast tank and the top ballast tank are continuously constructed; the air extraction device is arranged at the permanent manhole of the main deck, and the air in the middle ballast tank and the top ballast tank is extracted; during the use of the air extraction device, the air is sent into the middle ballast tank through the permanent manhole of the passage, so that the air in the middle ballast tank and the top ballast tank forms a convection; When the middle ballast tank has been constructed, all the third ventilation holes are closed, so that the middle ballast tank forms a completely closed state; the top ballast tank is continuously constructed, and the air extraction device and the air supply device are arranged at the permanent manhole of the main deck outside the top ballast tank, one of which is used to extract the air in the top ballast tank, and the other is used to send fresh air into the top ballast tank, so that the air in the top ballast tank forms a convection.

2. A method of ventilating a ballast tank of a semi-submersible vessel according to claim 1, characterized in that, The air supply device is a blower.

3. A method of ventilating a ballast tank of a semi-submersible vessel according to claim 1, characterized in that, The air extraction device is an exhaust fan.

4. A method of ventilating a ballast tank of a semi-submersible vessel according to claim 1, characterized in that, The air supply device and the air extraction device are both provided with a speed regulator for adjusting the air volume and the air speed according to the construction environment.

5. A method of ventilating a ballast tank of a semi-submersible vessel according to claim 1, characterized in that, The ventilation method further comprises a wind channel integrity and sealing inspection before each construction stage.

6. A method of ventilating a ballast tank of a semi-submersible vessel according to claim 1, characterized in that, The ventilation method further comprises using an air quality monitoring device to monitor the air quality in the ballast tank in real time during the ventilation process.

7. A method of ventilating a ballast tank of a semi-submersible vessel according to claim 1, characterized in that, The ventilation method further comprises using an air purification device during the ventilation process.

8. A method of ventilating a ballast tank of a semi-submersible vessel according to claim 1, characterized in that, The ventilation method further comprises arranging a plurality of point temperature and humidity sensors in the ballast tank to monitor the environmental changes in each area.

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