Composite cabin ventilation system capable of meeting dynamic positioning redundancy requirement

Abstract

The utility model discloses a composite cabin ventilation system meeting dynamic positioning redundancy requirements, which comprises an exhaust shutter, an air inlet shutter and a fan which are positioned in an upper cabin, a structural air duct positioned in a middle cabin and a diesel generator set positioned in a lower cabin, and the air inlet shutter, the fan, the structural air duct and a cavity of the lower cabin are sequentially communicated. The cavity of the lower-layer cabin is communicated to an exhaust shutter through a chimney; and an air brake for controlling the ventilation quantity is arranged between the fan and the structural air duct. According to the utility model, a water cooling mode is utilized to completely replace the heat dissipation air volume of a main part during the design of a conventional cabin ventilation system, and the discharge capacity of a ventilation fan and the size of an air duct are reduced. The internal circulation cooling jet fan does not need to be started, normal operation of the ship can be guaranteed through the frequency conversion fans with the small number and power, and energy conservation and emission reduction are achieved. All the frequency conversion fans and the internal circulation cooling jet fans can work at the same time, the use requirements of tropical areas under extremely hot working conditions are met, and the working condition adaptability of ships is improved.

Description

Technical Field

[0001] The utility model relates to a composite engine room ventilation system that meets the redundancy requirements of dynamic positioning and belongs to the field of ship and ocean engineering. Background Art

[0002] The engine room is the power core of the ship. Numerous power equipment are arranged in the engine room. Equipment such as the main engine and generator consume a lot of gas and generate a lot of heat, while equipment such as the oil purifier and oil supply unit emit a large amount of oil and gas. Therefore, the ship's engine room must ensure sufficient ventilation to remove heat from the engine room while meeting the working needs of the equipment.

[0003] Traditional engine room ventilation primarily relies on mechanical forced convection heat exchange, with engines using fans to deliver fresh air for combustion and cooling, ensuring proper operation of equipment and the safety and comfort of operators. Engine room ventilation is primarily improved by increasing air volume.

[0004] However, considering the requirements of ship space, equipment layout and structural strength, the engine room ventilation air volume and duct layout are greatly restricted.

[0005] Some vessel types, such as semi-submersibles, require large, full-length decks. Protruding structures that could interfere with cargo loading, such as ventilators, fan rooms, chimneys, and living quarters, are prohibited. The available space for ventilation systems and air ducts is extremely limited. Furthermore, some offshore vessels also feature dynamic positioning notations. As a crucial power-assisted system, engine room ventilation requires sufficient redundancy to ensure sufficient power in the event of a single fan or other single-point failure, further complicating engine room ventilation system challenges.

[0006] In this context, how to design an engine room ventilation system that takes up minimal space, meets the needs of all ship equipment and personnel, and meets the redundancy requirements of offshore vessels is a technical problem that needs to be solved at present. Utility Model Content

[0007] The technical problem to be solved by the utility model is: how to design a cabin ventilation system which occupies the minimum space, meets the needs of equipment and personnel of the entire ship, and meets the redundancy requirements of offshore vessels.

[0008] In order to solve the above technical problems, the technical solution of the utility model is to provide a composite cabin ventilation system that meets the redundancy requirements of dynamic positioning, which is characterized in that it includes exhaust louvers and air inlet louvers and a fan located in the upper cabin, a structural air duct located in the middle cabin, and a diesel generator set located in the lower cabin. The air inlet louvers, the fan, the structural air duct, and the cavity of the lower cabin are connected in sequence, and the cavity of the lower cabin is connected to the exhaust louvers through a chimney. A wind damper for controlling the ventilation volume is provided between the fan and the structural air duct.

[0009] Preferably, an air duct is further provided in the lower cabin, the air outlet of the structural air duct is connected to the ventilation duct, and multiple air outlets are provided at the bottom of the air duct. The multiple air outlets are evenly distributed on at least one side of the diesel generator set and facing the position of the diesel generator set.

[0010] Preferably, a chimney connected to the lower cabin is provided above the diesel generator set, and the chimney is connected to the exhaust louvers.

[0011] Preferably, a plurality of temperature sensors and pressure sensors are provided in the lower cabin at the air ducts and the air inlets and outlets of the diesel generator set.

[0012] Preferably, the operation signals of various devices in the lower cabin, the pressure signals of various points in the lower cabin, and the temperature signals of various points in the lower cabin are connected to the fan control system; the various devices in the lower cabin include a diesel generator set and an air compressor.

[0013] Preferably, the lower cabin is further provided with a plurality of internal circulation cooling jet fans, each of which is provided with a water-cooled fan coil.

[0014] Preferably, the internal circulation cooling jet fan is separately arranged from the structural air duct and the air pipe.

[0015] Preferably, the fan is a variable frequency fan; by adjusting the fan operating frequency, air volume and pressure, the system always operates at the most economical working point.

[0016] Preferably, the number of the fans is at least two. Under the maximum fault condition of dynamic positioning, only one fan or the total displacement of the fans in one power redundancy group is left to meet the air consumption of the equipment in the engine room for combustion and the air required for cooling the equipment in the engine room. When configuring the fan displacement, the change in air volume caused by the resistance reduction factor must be taken into account to ensure that under the non-dynamic positioning condition of the ship, there is no need to turn on the internal circulation cooling jet fan, and the fan can be used to ensure the normal operation of the ship.

[0017] Preferably, all the fans and internal circulation cooling jet fans work simultaneously to meet the use requirements under extremely hot conditions in tropical areas.

[0018] Compared with the prior art, the present invention has at least one of the following advantages:

[0019] 1) The composite cabin ventilation system described in the present invention includes several sets of internal-circulation cooling jet fans equipped with water-cooled fan coils. Seawater or refrigerant water is used to cool the air flowing through it, and the heat dissipated by the seawater or refrigerant water meets the cooling needs of all equipment in the cabin. Water cooling completely replaces the heat dissipation air volume, which accounts for the majority of previous cabin ventilation system designs, reducing the ventilation fan displacement and air duct size. Furthermore, the modification of the internal-circulation cooling jet fans does not involve structural air ducts and air pipes. The number of jet fans can be increased according to the increased heat load, providing good scalability and adaptability.

[0020] 2) The composite engine room ventilation system described in this utility model includes two or more variable frequency fans, whose total displacement meets the air consumption of equipment such as diesel generators and air compressors in the engine room, as well as the air volume required for cooling the engine room equipment. This ensures that when the ship is not dynamically positioning, the internal circulation cooling jet fans do not need to be activated. A smaller number of variable frequency fans with lower power can ensure normal ship operation, thus reducing energy consumption and emissions.

[0021] 3) The composite cabin ventilation system described in the present invention can meet the air consumption of diesel generator sets, air compressors and other equipment in the cabin and the air volume required for cooling the cabin equipment under the conditions where all variable frequency fans are in operation or one (a group of) variable frequency fans and internal circulation cooling jet fans are in operation, and can meet the redundancy requirements of dynamic positioning without increasing the fan displacement and air duct size.

[0022] 4) In the composite cabin ventilation system described in the present invention, all variable frequency fans and internal circulation cooling jet fans can work simultaneously, meeting the use requirements under extremely hot working conditions in tropical areas and improving the adaptability to ship working conditions.

[0023] 5) In the composite engine room ventilation system described in the present invention, the fan in the engine room adopts variable frequency control, and the operating signals of the diesel generator set, air compressor and other equipment in the engine room, the pressure signals of various points in the engine room, the temperature signals of various points in the engine room, etc. are connected to the fan control system to adjust the fan operating frequency, air volume and pressure, so that the system always operates at the most economical working point, thereby improving the economic efficiency of ship operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The figure is a side view of a composite cabin ventilation system that meets the redundancy requirements of dynamic positioning;

[0025] Figure 2 A top view of the cabin showing a composite cabin ventilation system that meets the redundancy requirements of dynamic positioning. DETAILED DESCRIPTION

[0026] In order to make the present invention more clear and easy to understand, preferred embodiments are described in detail below with reference to the accompanying drawings.

[0027] The utility model provides a composite cabin ventilation system that meets the redundancy requirements of dynamic positioning, such as Figure 1 、 Figure 2 As shown, it includes a fan 1 located at the stern pipe, a damper 2, a structural air duct 3 (i.e., an air inlet duct), an air duct 4, an air outlet 5, an internal circulation cooling jet fan 6, a diesel generator set 7, a temperature sensor 8, a pressure sensor 9, an air inlet louver 10, and an exhaust louver 11. The air inlet louver 10, the fan 1, and the damper 2 are located in the upper cabin, the structural air duct 3 is located in the middle cabin, and the diesel generator set 7 is located in the lower cabin. The air inlet louver 10, the fan 1, the structural air duct 3, the cavity of the lower cabin, and the exhaust louver 11 are connected in sequence. A damper 2 for controlling the ventilation volume is provided between the fan 1 and the structural air duct 3. An air duct 4 is provided in the lower cabin, and the air outlet of the structural air duct 3 is connected to the ventilation duct 4. A plurality of air outlets 5 are provided at the bottom of the air duct 4, and the plurality of air outlets 5 are evenly distributed on at least one side of the diesel generator set 7, as shown in FIG. Figure 2 As shown, and facing the position of diesel generator set 7. The top of diesel generator set 7 is provided with a chimney (i.e. air outlet pipe) connected to the lower cabin, and the chimney is connected to the exhaust louver 11.

[0028] The air enters from the air inlet louvers 10 of the upper engine room, is then exhausted downward through the fan 1, passes through the structural air duct 3 of the middle engine room, enters the lower engine room, and cools the diesel generator set 7 through the multiple air outlets 5 at the bottom of the air duct 4. The air then enters the chimney above the lower engine room, passes through the chimney to the exhaust louvers 11, and is discharged out of the hull to the outside atmosphere.

[0029] In the lower cabin, several temperature sensors 8 and pressure sensors 9 are set at the positions of the air inlet and outlet main pipe (i.e., air duct 4), the air inlet and outlet of the diesel generator set 7, etc. In this embodiment, the temperature sensor 8 and the pressure sensor 9 are all set in the lower cabin.

[0030] The fan 1 in the upper engine room adopts variable frequency control, and the operating signals of the diesel generator set 7, air compressor and other equipment in the lower engine room, the pressure signals of various points in the lower engine room, and the temperature signals of various points in the lower engine room are connected to the fan control system to adjust the operating frequency, air volume and pressure of the fan 1, so that the system always runs at the most economical working point, thereby improving the economic efficiency of ship operation.

[0031] like Figure 2As shown, a number of internal circulation cooling jet fans 6 are also provided in the lower cabin. The internal circulation cooling jet fans 6 are equipped with water-cooled fan coils, which use seawater or refrigerant water to cool the air flowing through. The heat dissipation of seawater or refrigerant water meets the cooling needs of all equipment in the cabin. When the fan 1 in the upper cabin is operating normally or under fault conditions, air circulation in the room is guaranteed. The water cooling method is used to completely replace the heat dissipation air volume that accounts for the main part of the previous cabin ventilation system design, reducing the displacement of the ventilation fan 1, the size of the structural air duct 3, and the air duct 4. Furthermore, the modification of the internal circulation cooling jet fan 6 does not involve the structural air duct 3 and the air duct 4 (that is, the internal circulation cooling jet fan 6 is relatively independent, and the internal circulation cooling jet fan 6 is separately set from the structural air duct 3 and the air duct 4). The number of internal circulation cooling jet fans 6 can be increased according to the increased heat load, and the scalability and modification are good.

[0032] As a preferred embodiment, the number of fans 1 in the present invention is two or more (i.e., more than two). Under the maximum fault condition of dynamic positioning, the total displacement of only one remaining fan or one power redundancy group of fans 1 can meet the air consumption of the diesel generator set 7, air compressor and other equipment in the engine room and the air required for cooling the engine room equipment. When configuring the displacement of the fan 1, the change in air volume caused by the resistance reduction factor must be taken into account. Ensure that under the non-dynamic positioning condition of the ship, there is no need to turn on the internal circulation cooling jet fan 6. The use of variable frequency fans with smaller number and power can ensure the normal operation of the ship, save energy, reduce emissions and reduce the risk of failure.

[0033] As a preferred embodiment, when the fan 1 is in operation or one (a group of) fans 1 and the internal circulation cooling jet fan 6 are in operation, the air consumption for combustion of the diesel generator set 7, air compressor and other equipment in the cabin and the air volume required for cooling the cabin equipment can be met, and the dynamic positioning redundancy requirements can be met without increasing the displacement of the fan 1 and the size of the air duct 3;

[0034] As a preferred embodiment, all fans 1 and the internal circulation cooling jet fans 6 can work simultaneously, meeting the use requirements under extremely hot working conditions in tropical areas and improving the adaptability of ship working conditions.

Claims

1. A composite cabin ventilation system that meets the redundancy requirements of dynamic positioning, characterized in that: The invention comprises an exhaust louver (11) and an air inlet louver (10) located in an upper cabin, a fan (1), a structural air duct (3) located in a middle cabin, and a diesel generator set (7) located in a lower cabin. The air inlet louver (10), the fan (1), the structural air duct (3), and the cavity of the lower cabin are connected in sequence. The cavity of the lower cabin is connected to the exhaust louver (11) through a chimney. A damper (2) for controlling the ventilation volume is provided between the fan (1) and the structural air duct (3).

2. A composite cabin ventilation system that meets the dynamic positioning redundancy requirements according to claim 1, characterized in that: An air duct (4) is further provided in the lower cabin, an air outlet of the structural air duct (3) is connected to the ventilation duct (4), a plurality of air outlets (5) are provided at the bottom of the air duct (4), and the plurality of air outlets (5) are evenly distributed on at least one side of the diesel generator set (7) and facing the position of the diesel generator set (7).

3. A composite cabin ventilation system that meets the redundancy requirements of dynamic positioning according to claim 1, characterized in that: A chimney connected to the lower engine room is provided above the diesel generator set (7), and the chimney is connected to the exhaust louver (11).

4. A composite cabin ventilation system that meets the dynamic positioning redundancy requirements according to claim 1, characterized in that: A plurality of temperature sensors (8) and pressure sensors (9) are provided in the lower cabin at the air inlet and outlet positions of the air duct (4) and the diesel generator set (7).

5. A composite cabin ventilation system that meets the redundancy requirements of dynamic positioning according to claim 4, characterized in that: The operation signals of each device in the lower cabin, the pressure signals of each point in the lower cabin, and the temperature signals of each point in the lower cabin are connected to the fan control system; the various devices in the lower cabin include a diesel generator set (7) and an air compressor.

6. The composite cabin ventilation system meeting the dynamic positioning redundancy requirements according to claim 1, characterized in that: The lower cabin is further provided with a plurality of internal circulation cooling jet fans (6), each of which is provided with a water-cooled fan coil.

7. A composite cabin ventilation system that meets the redundancy requirements of dynamic positioning according to claim 6, characterized in that: The internal circulation cooling jet fan (6) is separately arranged from the structural air duct (3) and the air duct (4).

8. The composite cabin ventilation system meeting the dynamic positioning redundancy requirements according to claim 6, characterized in that: The fan (1) is a variable frequency fan; by adjusting the operating frequency, air volume and pressure of the fan (1), the system is always operated at the most economical working point.

9. A composite cabin ventilation system that meets the redundancy requirements of dynamic positioning according to claim 6 or 8, characterized in that: The number of the fans (1) is at least two. Under the maximum fault condition of dynamic positioning, only one fan (1) or the total displacement of the fans (1) in one power redundancy group is left to meet the air consumption of the equipment in the engine room for combustion and the air required for cooling the equipment in the engine room. When configuring the displacement of the fans (1), the change in air volume caused by the resistance reduction factor must be taken into account to ensure that under the non-dynamic positioning condition of the ship, the internal circulation cooling jet fan (6) does not need to be turned on, and the fan (1) can be used to ensure the normal operation of the ship.

10. A composite cabin ventilation system that meets the redundancy requirements of dynamic positioning according to claim 6 or 8, characterized in that: All the fans (1) and the internal circulation cooling jet fans (6) work simultaneously, meeting the use requirements under extremely hot working conditions in tropical areas.

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