Liquefied gas-fueled ship

Abstract

To provide a liquefied gas fuel vessel capable of achieving both of improvement in safety and suppression of increase of manufacturing costs.SOLUTION: A liquefied gas fuel vessel includes: a hull 11; an engine 12; a fuel tank 13 for storing, in a liquid state, a fuel which is in gaseous state under ordinary temperature and pressure; a tank pipe group 14 including a plurality of tank pipes 32 positioned outside the hull and connected to the fuel tank; a fuel processing device 15 positioned outside the hull for adjusting a temperature and a pressure of the fuel supplied to the engine; a fuel pipe 16 positioned outside the hull for connecting the fuel tank and the fuel processing device; a tank connection chamber 17 sealing and covering the tank pipe group; a fuel processing chamber 18 for sealing and covering the fuel processing device; and a pipe secondary covering 19 for sealing and covering the fuel pipe.SELECTED DRAWING: Figure 1

Description

【Technical Field】 【0001】 The present disclosure relates to a liquefied gas fuel ship using liquefied gas as fuel. 【Background Art】 【0002】 Piping located in a compartment within the hull of a liquefied gas fuel ship where sufficient ventilation is not provided is generally double-piped (see Patent Document 1 below). On the other hand, since it is difficult for gas to accumulate outside the hull of a liquefied gas fuel ship, single-piped is generally used for piping located outside the hull of a liquefied gas fuel ship. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Patent Application Laid-Open No. 2021-123121 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 In order to further improve the safety of a liquefied gas fuel ship, it is desirable that all piping located outside the hull is also double-piped. However, in this case, the manufacturing cost of the liquefied gas fuel ship will increase significantly. 【0005】 Therefore, an object of the present disclosure is to provide a liquefied gas fuel ship that can achieve both an improvement in safety and a suppression of an increase in manufacturing cost. 【Means for Solving the Problems】 【0006】 A liquefied gas-fueled vessel according to one aspect of the present disclosure comprises a hull, an engine, a fuel tank for storing fuel that is a gas at ambient temperature and atmospheric pressure in a liquid state, a group of tank piping including a plurality of tank pipes located outside the hull and connected to the fuel tank, a fuel treatment device located outside the hull for adjusting the temperature and pressure of the fuel supplied to the engine, fuel piping located outside the hull connecting the fuel tank and the fuel treatment device, a tank connection chamber that seals and covers the group of tank piping, a fuel treatment chamber that seals and covers the fuel treatment device, and a secondary piping enclosure that seals and covers the fuel piping. [Effects of the Invention] 【0007】 This configuration makes it possible to provide a liquefied gas-fueled vessel that achieves both improved safety and suppressed increases in manufacturing costs. [Brief explanation of the drawing] 【0008】 [Figure 1] Figure 1 is a schematic front view of a liquefied gas-fueled vessel according to the first embodiment. [Figure 2] Figure 2 is a schematic front view of a liquefied gas-fueled vessel according to a first modification of the first embodiment. [Figure 3] Figure 3 is a schematic front view of a liquefied gas-fueled vessel according to a second modification of the first embodiment. [Figure 4] Figure 4 is a schematic front view of a liquefied gas-fueled vessel according to a third modification of the first embodiment. [Figure 5] Figure 5 is a schematic side view of a liquefied gas-fueled vessel according to a fourth modification of the first embodiment. [Figure 6] Figure 6 is a schematic front view of a liquefied gas-fueled vessel according to the second embodiment. [Figure 7] Figure 7 is a schematic front view of a liquefied gas-fueled vessel according to a modified example of the second embodiment. [Figure 8] Figure 8 is a schematic front view of a liquefied gas-fueled vessel according to the third embodiment. [Figure 9] Figure 9 is a schematic front view of a modified liquefied gas-fueled vessel according to the third embodiment. [Modes for carrying out the invention] 【0009】 (First Embodiment) The embodiments will be described below. First, the liquefied gas fuel vessel 100 according to the first embodiment will be described. Figure 1 is a schematic front view of the liquefied gas fuel vessel 100 according to the first embodiment. In Figure 1, the left-right direction of the paper is the width direction of the hull 11, and the direction perpendicular to the paper is the front-rear direction of the hull 11 (the same applies to Figures 2 to 4 and Figures 6 to 9). 【0010】 As shown in Figure 1, the liquefied gas-fueled vessel 100 according to this embodiment comprises a hull 11, an engine 12, a fuel tank 13, a tank piping group 14, a fuel treatment device 15, fuel piping 16, a tank connection chamber 17, a fuel treatment chamber 18, a secondary piping enclosure 19, an air supply duct 20, and an exhaust duct 21. These components will be described in order below. 【0011】 The hull 11 is equipped with various facilities. In this embodiment, the hull 11 has a deck 31 that is exposed to the outside air, which is the upper part of the hull 11. In this embodiment, the area above the deck 31 is considered "outside the hull," and the area below the deck 31 of the hull 11 is considered "inside the hull." In this embodiment, "deck" includes not only the upper deck, but also decks located above the upper deck and decks located below the upper deck. 【0012】 Engine 12 generates power to propel the liquefied gas-fueled vessel 100. Engine 12 is located inside the hull. In this embodiment, engine 12 uses liquefied gas as fuel. Liquefied gas is a gas that has been turned into a liquid at room temperature and atmospheric pressure; for example, liquefied hydrogen and LNG are examples of liquefied gas. Engine 12 is supplied with either liquid liquefied gas or gas obtained by vaporizing liquefied gas as fuel. 【0013】 The fuel tank 13 stores the liquefied gas fuel in a liquid state. The liquefied gas-fueled vessel 100 according to this embodiment is equipped with two fuel tanks 13. Both fuel tanks 13 are located on the deck 31. Furthermore, the two fuel tanks 13 are positioned symmetrically with respect to the center of the width direction of the hull 11. In addition, although the fuel tank 13 in this embodiment is cylindrical and extends in the longitudinal direction of the hull 11, the shape of the fuel tank 13 is not particularly limited. Note that part or all of the fuel tank 13 may be located below the deck 31. 【0014】 The tank piping group 14 is located above the fuel tank 13. The liquefied gas-fueled vessel 100 according to this embodiment has two tank piping groups 14. Both tank piping groups 14 include multiple tank pipes 32. Each tank pipe 32 is located above the fuel tank 13 (i.e., outside the hull) and is connected to the fuel tank 13. The tank pipes 32 include, for example, pipes for temporarily taking liquefied gas from the fuel tank 13 for inspection, fuel supply pipes, and boil-off gas pipes. In this embodiment, each tank pipe 32 is a single-duplex pipe. 【0015】 The fuel treatment device 15 adjusts (processes) the temperature and pressure of the fuel supplied to the engine 12. The fuel treatment device 15 is located on the deck 31 (i.e., outside the hull). In this embodiment, the fuel treatment device 15 is located in the center of the width direction of the hull 11, between the two fuel tanks 13. The temperature and pressure of the fuel supplied to the engine 12 are preset according to the engine model and operating conditions. Depending on the specifications of the engine 12, the fuel treatment device 15 may supply liquefied gas to the engine 12 in liquid form, or it may vaporize the liquefied gas before supplying it to the engine 12. The fuel processed by the fuel treatment device 15 is supplied to the engine 12 via engine piping 33 located inside the hull. 【0016】 The fuel pipe 16 connects the fuel tank 13 and the fuel processing device 15. The fuel pipe 16 is located outside the hull of the ship. The fuel pipe 16 of the present embodiment includes two individual parts 34 that connect to the corresponding fuel tank 13, and a confluence part 35 that connects the two individual parts 34 and the fuel processing device 15. Note that the fuel pipe 16 of the present embodiment is a single pipe. When the pipe connecting the fuel tank 13 and the fuel processing device 15 is a double pipe, the inner internal pipe corresponds to the fuel pipe 16. 【0017】 The tank connection chamber 17 is a room that hermetically covers the tank pipe group 14. The liquefied gas fuel ship 100 according to the present embodiment includes two tank connection chambers 17. Each tank connection chamber 17 hermetically covers the corresponding tank pipe group 14. Thus, in the present embodiment, since the tank connection chamber 17 hermetically covers the tank pipe group 14, even if fuel leaks from the tank pipe group 14, the fuel will not spread around the tank pipe group 14, so the safety is high. Furthermore, in the present embodiment, since the tank connection chamber 17 covers the entire tank pipe group 14, compared with a configuration in which each tank pipe 32 is individually covered (including a configuration in which all the tank pipes 32 are double pipes), an increase in the manufacturing cost of the liquefied gas fuel ship 100 can be suppressed. 【0018】 The fuel processing chamber 18 is a room that hermetically covers the fuel processing device 15. Thus, in the present embodiment, since the fuel processing chamber 18 hermetically covers the fuel processing device 15, even if fuel leaks from the fuel processing device 15, the fuel will not spread around the fuel processing device 15, so the safety is high. 【0019】 The pipe secondary enclosure 19 is a member that hermetically covers the fuel pipe 16. The pipe secondary enclosure 19 of the present embodiment connects the tank connection chamber 17 and the fuel processing chamber 18 and extends along the fuel pipe 16. Thus, in the present embodiment, since the pipe secondary enclosure 19 hermetically covers the fuel pipe 16, even if fuel leaks from the fuel pipe 16, the fuel will not spread around the fuel pipe 16, so the safety is high. Note that when the pipe connecting the fuel tank 13 and the fuel processing device 15 is a double pipe, the outer external pipe corresponds to the pipe secondary enclosure 19. 【0020】 In this embodiment, the tank connection chamber 17, the fuel processing chamber 18, and the spaces covered by the secondary piping enclosure 19 are all interconnected, forming a common space 40. In other words, gas can pass between the tank connection chamber 17 and the secondary piping enclosure 19, and can also pass between the secondary piping enclosure 19 and the fuel processing chamber 18. 【0021】 The air supply duct 20 supplies air to the common space 40 described above. The liquefied gas-fueled vessel 100 according to this embodiment is equipped with two air supply ducts 20. The two air supply ducts 20 are each connected to the tank connection chamber 17. The air supply ducts 20 take in outside air (air) from an air intake port 41 located at the upper end of the air supply duct 20 and supply the taken-in outside air to the tank connection chamber 17 (i.e., to the common space 40). 【0022】 The exhaust duct 21 discharges air from the common space 40. The liquefied gas-fueled vessel 100 according to this embodiment is equipped with one exhaust duct 21. The exhaust duct 21 is connected to the fuel processing chamber 18. An exhaust fan 42 is located inside the exhaust duct 21. The exhaust duct 21 takes in air from the fuel processing chamber 18 (i.e., from the common space 40) and discharges the taken-in air from an exhaust port 43 located at the upper end of the exhaust duct 21. 【0023】 With the supply air duct 20 and exhaust air duct 21 positioned as described above, ventilation can be achieved within the space covered by the tank connection chamber 17, fuel processing chamber 18, and secondary piping enclosure 19, even without placing both the supply air duct 20 and exhaust air duct 21 in each of the tank connection chamber 17, fuel processing chamber 18, and secondary piping enclosure 19. Moreover, within the common space 40, an airflow is formed from the tank connection chamber 17 through the secondary piping enclosure 19 toward the fuel processing chamber 18, allowing for efficient ventilation within the common space 40. As a result, even if fuel leaks into the common space 40, the increase in fuel concentration within the common space 40 is suppressed, improving safety. 【0024】 In this embodiment, the supply air duct 20 is connected to the tank connection chamber 17 and the exhaust duct 21 is connected to the fuel processing chamber 18, but the connection positions may be reversed. That is, the supply air duct 20 may be connected to the fuel processing chamber 18 and the exhaust duct 21 may be connected to the tank connection chamber 17. In this case, an airflow is formed within the common space 40 from the fuel processing chamber 18 to the tank connection chamber 17 via the secondary piping enclosure 19, but even in this case, ventilation within the common space 40 can be performed efficiently. 【0025】 Furthermore, in this case, the intake port 41 will be located closer to the center in the width direction of the hull 11 than the exhaust port 43 of the exhaust duct 21. In this configuration, since the intake port 41 is located closer to the center in the width direction of the hull 11, it is possible to suppress seawater from entering the common space 40 through the intake port 41 of the intake duct 20. 【0026】 Furthermore, the liquefied gas fuel vessel 100 according to this embodiment may be equipped with fire dampers located near the boundary between the air supply duct 20 and the tank connection chamber 17, and near the boundary between the secondary piping enclosure 19 and the tank connection chamber 17. With this configuration, if a fire occurs in the tank connection chamber 17, closing the fire dampers will prevent the fire from spreading from the tank connection chamber 17. 【0027】 <First variation> Figure 2 is a schematic front view of a liquefied gas fuel vessel 100 according to a first modification of the first embodiment. The liquefied gas fuel vessel 100 according to the above embodiment is equipped with two supply air ducts 20 and one exhaust duct 21 (see Figure 1). However, the number of supply air ducts 20 and exhaust ducts 21 equipped in the liquefied gas fuel vessel 100 may be changed depending on the volume of the common space 40, the performance of the exhaust fan 42, etc. For example, as shown in Figure 2, the liquefied gas fuel vessel 100 may be equipped with two supply air ducts 20 connected to the fuel processing chamber 18 and two exhaust ducts 21 connected to each tank connection chamber 17. 【0028】 <Second variation> Figure 3 is a schematic front view of a liquefied gas-fueled vessel 100 according to a second modification of the first embodiment. In the liquefied gas-fueled vessel 100 according to the above embodiment, the fuel piping 16 includes two individual sections 34 and one junction section 35 (see Figure 1). However, depending on the positional relationship between the fuel piping 16 and the surrounding equipment, the fuel piping 16 does not need to include the junction section 35. In other words, as shown in Figure 3, the two individual sections 34 included in the fuel piping 16 may each connect to a corresponding fuel tank 13 and a fuel treatment device 15. In this case, the secondary piping enclosure 19 may separately seal and cover the two individual sections 34. 【0029】 <Third variation> Figure 4 is a schematic front view of a liquefied gas-fueled vessel 100 according to a third modification of the first embodiment. The liquefied gas-fueled vessel 100 according to the above embodiment is equipped with two fuel tanks 13 (see Figure 1). However, the number of fuel tanks 13 equipped in the liquefied gas-fueled vessel 100 is not limited. For example, as shown in Figure 4, the liquefied gas-fueled vessel 100 may be equipped with only one fuel tank 13. In this case, the tank piping group 14, the tank connection chamber 17, and the air supply duct 20 connected to the tank connection chamber 17 equipped in the liquefied gas-fueled vessel 100 will each be one. 【0030】 <Fourth variation> Figure 5 is a schematic side view of a liquefied gas-fueled vessel 100 according to a fourth modification of the first embodiment. In Figure 5, the left-right direction of the paper is the longitudinal direction of the hull 11, the right side of the paper is the bow side of the hull 11, and the left side of the paper is the stern side of the hull 11. In the liquefied gas-fueled vessel 100 according to the above embodiment, two fuel tanks 13 are positioned symmetrically with respect to the center of the width direction of the hull 11, and a fuel treatment device 15 is positioned between the two fuel tanks 13 (see Figure 1). However, the positions of the fuel tanks 13 and the fuel treatment device 15 are not limited to this. For example, if the liquefied gas-fueled vessel 100 has only one fuel tank 13, as shown in Figure 5, the fuel tank 13 may be located closer to the stern of the hull 11, and the fuel treatment device 15 may be located forward of the fuel tank 13. 【0031】 (Second Embodiment) Next, the liquefied gas fuel vessel 200 according to the second embodiment will be described, focusing on the differences from the liquefied gas fuel vessel 100 according to the first embodiment. Figure 6 is a schematic front view of the liquefied gas fuel vessel 200 according to the second embodiment. In the liquefied gas fuel vessel 100 according to the first embodiment, all the spaces covered by the tank connection chamber 17, the fuel processing chamber 18, and the secondary piping enclosure 19 were in communication to form a common space 40 (see Figure 1). In contrast, in the liquefied gas fuel vessel 200 according to the second embodiment, of the spaces covered by the tank connection chamber 17, the fuel processing chamber 18, and the secondary piping enclosure 19, only the spaces covered by the tank connection chamber 17 and the secondary piping enclosure 19 are in communication to form a common space 40. In other words, gas can pass between the tank connection chamber 17 and the secondary piping enclosure 19, but it cannot pass between the secondary piping enclosure 19 and the fuel processing chamber 18. 【0032】 Furthermore, the liquefied gas-fueled vessel 200 according to this embodiment is equipped with two supply air ducts 20 and three exhaust ducts 21. One of the two supply air ducts 20 is connected to the secondary piping enclosure 19. The supply air duct 20 is located in the center of the width direction of the secondary piping enclosure 19, but the position of the supply air duct 20 relative to the secondary piping enclosure 19 is not particularly limited. Two of the three exhaust ducts 21 are connected to each tank connection chamber 17, respectively. With the supply air duct 20 and exhaust ducts 21 positioned as described above, an airflow is formed in the common space 40 from the secondary piping enclosure 19 toward the tank connection chamber 17, thereby enabling efficient ventilation of the common space 40. 【0033】 In this embodiment, the supply air duct 20 is connected to the secondary piping enclosure 19 and the exhaust duct 21 is connected to the tank connection chamber 17, but the connection positions may be reversed. That is, the supply air duct 20 may be connected to the tank connection chamber 17 and the exhaust duct 21 may be connected to the secondary piping enclosure 19. In this case, an airflow will be formed within the common space 40 from the tank connection chamber 17 to the secondary piping enclosure 19, but even in this case, ventilation within the common space 40 can be performed efficiently. 【0034】 Furthermore, one of the two air intake ducts 20 provided by the liquefied gas-fueled vessel 200 is connected to the fuel processing chamber 18. In addition, one of the three exhaust ducts 21 provided by the liquefied gas-fueled vessel 200 is connected to the fuel processing chamber 18. The positioning of the air intake duct 20 and the exhaust duct 21 as described above allows for ventilation of the space covered by the fuel processing chamber 18. 【0035】 Furthermore, the liquefied gas fuel vessel 200 according to this embodiment may be equipped with fire dampers located near the boundary between the air supply duct 20 and the tank connection chamber 17, and near the boundary between the secondary piping enclosure 19 and the tank connection chamber 17. With this configuration, if a fire occurs in the tank connection chamber 17, closing the fire dampers can prevent the fire from spreading from the tank connection chamber 17. 【0036】 <Variation> Figure 7 is a schematic front view of a modified liquefied gas fuel vessel 200 according to the second embodiment. The liquefied gas fuel vessel 200 according to the above embodiment is equipped with two fuel tanks 13 (see Figure 6). However, the number of fuel tanks 13 equipped in the liquefied gas fuel vessel 200 is not limited. For example, as shown in Figure 7, the liquefied gas fuel vessel 200 may be equipped with only one fuel tank 13. In this case, the tank piping group 14, the tank connection chamber 17, and the exhaust duct 21 connected to the tank connection chamber 17 equipped in the liquefied gas fuel vessel 200 will each be one. In the liquefied gas fuel vessel 200 shown in Figure 7, the supply air duct 20 connected to the secondary piping enclosure 19 is connected to the part of the secondary piping enclosure 19 furthest from the tank connection chamber 17. 【0037】 (Third embodiment) Next, the liquefied gas fuel vessel 300 according to the third embodiment will be described, focusing on the differences from the liquefied gas fuel vessel 100 according to the first embodiment. Figure 8 is a schematic front view of the liquefied gas fuel vessel 300 according to the third embodiment. In the liquefied gas fuel vessel 100 according to the first embodiment, all the spaces covered by the tank connection chamber 17, the fuel processing chamber 18, and the secondary piping enclosure 19 were connected to form a common space 40 (see Figure 1). In contrast, in the liquefied gas fuel vessel 300 according to the third embodiment, of the spaces covered by the tank connection chamber 17, the fuel processing chamber 18, and the secondary piping enclosure 19, only the space covered by the fuel processing chamber 18 and the secondary piping enclosure 19 are connected to form a common space 40. In other words, gas can pass between the secondary piping enclosure 19 and the fuel processing chamber 18, but it cannot pass between the tank connection chamber 17 and the secondary piping enclosure 19. 【0038】 Furthermore, the liquefied gas-fueled vessel 300 according to this embodiment is equipped with four supply air ducts 20 and three exhaust ducts 21. Two of the four supply air ducts 20 are connected to the secondary piping enclosure 19. These two supply air ducts 20 are connected near the boundary between the secondary piping enclosure 19 and the tank connection chamber 17, but the position of the supply air ducts 20 relative to the secondary piping enclosure 19 is not particularly limited. One of the three exhaust ducts 21 is connected to the fuel processing chamber 18. With the supply air ducts 20 and exhaust ducts 21 positioned as described above, an airflow is formed within the common space 40 from the secondary piping enclosure 19 toward the fuel processing chamber 18, thereby enabling efficient ventilation within the common space 40. 【0039】 In this embodiment, the supply air duct 20 is connected to the secondary piping enclosure 19 and the exhaust duct 21 is connected to the fuel processing chamber 18, but the connection positions may be reversed. That is, the supply air duct 20 may be connected to the fuel processing chamber 18 and the exhaust duct 21 may be connected to the secondary piping enclosure 19. In this case, an airflow is formed within the common space 40 from the fuel processing chamber 18 toward the secondary piping enclosure 19, but even in this case, ventilation within the common space 40 can be performed efficiently. 【0040】 Furthermore, two of the four air intake ducts 20 provided by the liquefied gas-fueled vessel 300 are connected to each tank connection chamber 17. In addition, two of the three exhaust ducts 21 provided by the liquefied gas-fueled vessel 300 are connected to each tank connection chamber 17. The positioning of the air intake ducts 20 and exhaust ducts 21 as described above allows for ventilation of the space covered by the tank connection chamber 17. 【0041】 Furthermore, the liquefied gas-fueled vessel 300 according to this embodiment may be equipped with fire dampers located near the boundary between the air supply duct 20 and the tank connection chamber 17, and near the boundary between the exhaust duct 21 and the tank connection chamber 17. With this configuration, if a fire occurs in the tank connection chamber 17, closing the fire dampers can prevent the fire from spreading from the tank connection chamber 17. 【0042】 <Variation> Figure 9 is a schematic front view of a modified liquefied gas-fueled vessel 300 according to the third embodiment. The liquefied gas-fueled vessel 300 according to the above embodiment is equipped with two fuel tanks 13 (see Figure 8). However, the number of fuel tanks 13 equipped in the liquefied gas-fueled vessel 300 is not limited. For example, as shown in Figure 9, the liquefied gas-fueled vessel 300 may be equipped with only one fuel tank 13. In this case, the tank piping group 14, the tank connection chamber 17, and the air supply duct 20 connected to the tank connection chamber 17 equipped in the liquefied gas-fueled vessel 300 will each be one. 【0043】 (summary) The liquefied gas-fueled vessel according to the above embodiment comprises a hull, an engine, a fuel tank for storing fuel, which is a gas at ambient temperature and atmospheric pressure, in a liquid state, a group of tank piping including a plurality of tank pipes located outside the hull and connected to the fuel tank, a fuel treatment device located outside the hull for adjusting the temperature and pressure of the fuel supplied to the engine, fuel piping located outside the hull connecting the fuel tank and the fuel treatment device, a tank connection chamber that seals and covers the group of tank piping, a fuel treatment chamber that seals and covers the fuel treatment device, and a secondary piping enclosure that seals and covers the fuel piping. 【0044】 In this configuration, the tank connection chamber seals and covers the tank piping group, so even if fuel leaks from the tank piping group, the fuel will not spread to the surrounding area, resulting in high safety. Furthermore, in the above configuration, the tank connection chamber covers the entire tank piping group, which can reduce the manufacturing cost of a liquefied gas-fueled vessel compared to cases where multiple tank pipes are individually covered. 【0045】 Furthermore, in the liquefied gas fuel vessel according to the above embodiment, at least two of the spaces covered by the tank connection chamber, the fuel processing chamber, and the secondary piping enclosure are connected to form a common space, and the liquefied gas fuel vessel further includes an air supply duct for supplying air to the common space, and an exhaust duct in which an exhaust fan is located for discharging air from the common space. 【0046】 With this configuration, it is possible to ventilate the space enclosed by the tank connection chamber, fuel processing chamber, and secondary piping enclosure without having to place supply air ducts and exhaust ducts in each of the tank connection chamber, fuel processing chamber, and secondary piping enclosure. 【0047】 Furthermore, in the liquefied gas fuel vessel according to the first embodiment described above, the tank connection chamber, the fuel processing chamber, and all the spaces covered by the secondary piping enclosure are in communication to form a common space, the air supply duct is connected to one of the tank connection chamber and the fuel processing chamber, and the exhaust duct is connected to the other of the tank connection chamber and the fuel processing chamber. 【0048】 With this configuration, an airflow is formed within the common space from the tank connection chamber to the fuel processing chamber via the secondary piping enclosure, or from the fuel processing chamber to the tank connection chamber via the secondary piping enclosure, thus enabling efficient ventilation within the common space. 【0049】 Furthermore, in the liquefied gas fuel vessel according to the second embodiment described above, the tank connection chamber and the space covered by the secondary piping enclosure are in communication with each other to form a common space, the air supply duct is connected to one of the tank connection chamber and the secondary piping enclosure, and the exhaust duct is connected to the other of the tank connection chamber and the secondary piping enclosure. 【0050】 With this configuration, an airflow is formed within the common space from the tank connection room towards the secondary piping enclosure, or from the secondary piping enclosure towards the tank connection room, thus enabling efficient ventilation within the common space. 【0051】 Furthermore, in the liquefied gas fuel vessel according to the third embodiment described above, the fuel processing chamber and the space covered by the secondary piping enclosure are in communication with each other to form a common space, the air supply duct is connected to one of the fuel processing chamber and the secondary piping enclosure, and the exhaust duct is connected to the other of the fuel processing chamber and the secondary piping enclosure. 【0052】 With this configuration, an airflow is formed within the common space from the secondary piping enclosure towards the fuel processing chamber, or from the fuel processing chamber towards the secondary piping enclosure, thus enabling efficient ventilation within the common space. 【0053】 Furthermore, in the liquefied gas-fueled vessel according to the above-described embodiment, the air intake port of the air intake duct may be located closer to the center in the width direction of the hull than the exhaust port of the exhaust duct. 【0054】 With this configuration, the air intake is located closer to the center of the hull's width, which helps to prevent seawater from entering the common space through the air intake. [Explanation of symbols] 【0055】 11 Hull 12 Engines 13 Fuel tank 14 Tank piping group 15 Fuel treatment device 16 Fuel piping 17 Tank connection room 18 Fuel Processing Room 19. Secondary enclosure for piping 20 Air supply duct 21 Exhaust duct 32 Tank Piping 40 Common space 41 Air supply port 42 Exhaust fan 43 Exhaust vent 100, 200, 300 liquefied gas fuel ships

Claims

[Claim 1] The hull and, The engine and A fuel tank that stores fuel, which is a gas at room temperature and atmospheric pressure, in a liquid state, A group of tank piping including multiple tank pipes located outside the hull and connected to the fuel tank, A fuel processing device located outside the hull that adjusts the temperature and pressure of the fuel supplied to the engine, A fuel pipe located outside the hull connects the fuel tank and the fuel processing device, A tank connection chamber that seals and covers the aforementioned tank piping group, A fuel processing chamber that seals and covers the aforementioned fuel processing device, The system includes a secondary enclosure for sealing and covering the fuel piping, Liquefied gas fuel ship. [Claim 2] At least two of the spaces covered by the tank connection chamber, the fuel processing chamber, and the secondary piping enclosure are connected to form a common space. The liquefied gas fuel vessel in question is A supply air duct that supplies air to the aforementioned common space, It further includes an exhaust fan located inside and an exhaust duct that discharges air from the aforementioned common space. A liquefied gas fuel vessel according to claim 1. [Claim 3] The tank connection chamber, the fuel processing chamber, and all the spaces covered by the secondary piping enclosure are interconnected and form a common space. The aforementioned air supply duct is connected to either the tank connection chamber or the fuel processing chamber. The exhaust duct is connected to the other of the tank connection chamber and the fuel processing chamber. A liquefied gas fuel vessel according to claim 2. [Claim 4] Of the spaces covered by the tank connection chamber, the fuel processing chamber, and the secondary piping enclosure, the tank connection chamber and the space covered by the secondary piping enclosure are in communication and form a common space. The aforementioned air supply duct is connected to either the tank connection chamber or the secondary piping enclosure. The exhaust duct is connected to the other of the tank connection chamber and the secondary enclosure of the piping. A liquefied gas fuel vessel according to claim 2. [Claim 5] Of the spaces covered by the tank connection chamber, the fuel processing chamber, and the secondary piping enclosure, the fuel processing chamber and the space covered by the secondary piping enclosure are connected to form a common space. The aforementioned air supply duct is connected to either the fuel processing chamber or the secondary piping enclosure. The exhaust duct is connected to the other of the fuel processing chamber and the secondary enclosure of the piping. A liquefied gas fuel vessel according to claim 2. [Claim 6] The liquefied gas-fueled vessel according to any one of claims 2 to 5, wherein the air intake port of the air intake duct is located closer to the center in the width direction of the hull than the exhaust port of the exhaust duct.

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