EP3591291A1 - Chaudière, navire doté de chaudière, et procédé de production de gaz inerte - Google Patents

Chaudière, navire doté de chaudière, et procédé de production de gaz inerte Download PDF

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Publication number
EP3591291A1
EP3591291A1 EP18761294.0A EP18761294A EP3591291A1 EP 3591291 A1 EP3591291 A1 EP 3591291A1 EP 18761294 A EP18761294 A EP 18761294A EP 3591291 A1 EP3591291 A1 EP 3591291A1
Authority
EP
European Patent Office
Prior art keywords
burner
furnace
boiler
inert gas
gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP18761294.0A
Other languages
German (de)
English (en)
Other versions
EP3591291B1 (fr
EP3591291A4 (fr
Inventor
Takazumi TERAHARA
Kenta TAKAMOTO
Hideki Amano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Marine Machinery and Equipment Co Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Publication of EP3591291A1 publication Critical patent/EP3591291A1/fr
Publication of EP3591291A4 publication Critical patent/EP3591291A4/fr
Application granted granted Critical
Publication of EP3591291B1 publication Critical patent/EP3591291B1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
    • F23C5/08—Disposition of burners
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D23/00—Assemblies of two or more burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M5/00—Casings; Linings; Walls
    • F23M5/08—Cooling thereof; Tube walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2237/00—Controlling
    • F23N2237/02—Controlling two or more burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2237/00—Controlling
    • F23N2237/04—Controlling at two or more different localities

Definitions

  • the present invention relates to a boiler, a ship equipped with the boiler, and a method for generating an inert gas.
  • LNG liquefied natural gas
  • an inert gas is utilized. This is because, since the fuel gas and the air may cause a combustion reaction if air is directly supplied into the tank to remove the fuel gas, the tank is once filled with an inert gas to remove the fuel gas, and air is then supplied into the tank. Therefore, some LNG carriers are equipped with a dedicated device for generating an inert gas (inert gas generator (IGG), etc.). Further, in some crude oil tankers and the like, a combustion flue gas of a boiler or the like is utilized as an inert gas.
  • IMG inert gas generator
  • PTL 1 discloses a volatile organic compound (VOC) gas treatment system that utilizes, as an inert gas, a flue gas from a boiler which is cleaned by a scrubber (and from which a sulfur component and the like are removed).
  • VOC volatile organic compound
  • the combustion flue gas of the boiler or the like cannot be utilized as an inert gas in a normal LNG carrier, and a dedicated device for generating an inert gas is mounted.
  • the dedicated device for generating an inert gas when the dedicated device for generating an inert gas is mounted, the dedicated device only combusts light oil or the like, and hence it has not been possible to effectively utilize energy that occurs at the time of generating an inert gas.
  • the boiler is provided with only one burner, so that one burner is to cover the function of generating steam in the boiler and the function of generating an inert gas.
  • a burner provided in a normal ship boiler cannot sufficiently reduce an oxygen content of a combustion flue gas due to the constraint of needing to satisfy the function of generating steam, and the generated inert gas may react with a flammable gas in a fuel tank.
  • the burner for the ship boiler has a large capacity for the purpose of generating predetermined steam, and the burner may generate more combustion gas than necessary when intended to generate an inert gas. This requires additional installation of a small-capacity burner.
  • the present invention has been made in view of such circumstances, and an object of the present invention is to provide a boiler capable of generating steam by using energy that occurs at the time of generating an inert gas, a ship equipped with the boiler, and a method for generating an inert gas.
  • the following means are employed in the boiler, the ship equipped with the boiler, and the method for generating an inert gas according to the present invention.
  • the boiler includes: a furnace; a first burner that combusts fuel in the furnace; and a second burner that is provided separately from the first burner and combusts fuel in the furnace to generate an inert gas.
  • the second burner for generating an inert gas in the furnace is provided.
  • the inert gas is a gas having an oxygen content at which no reaction occurs with a flammable gas.
  • the oxygen content at which no reaction occurs with a flammable gas means an oxygen content at which no ignition occurs in air (e.g., atmospheric pressure, etc.), for example, 1% or less.
  • the first burner is disposed in an upper portion of the furnace and forms a flame downward
  • the second burner is disposed in a lower portion of the furnace.
  • the first burner is disposed in the upper portion of the furnace, and the second burner is disposed in the lower portion of the furnace.
  • This enables the first burner and the second burner to be disposed at positions apart from each other. It is thus possible to prevent the first burner from being damaged by the radiant heat of the flame of the second burner, while simultaneously preventing the second burner from being damaged by the radiant heat of the flame of the first burner. Further, with the first burner forming the flame downward, the heat flux of the flame of the first burner decreases in the lower portion of the furnace. Thus, by disposing the second burner in the lower portion of the furnace, it is possible to further prevent the second burner from being damaged by the flame of the first burner.
  • the second burner is disposed apart from the first burner and thus does not affect the space in which the first burner is disposed. Hence it is possible to sufficiently ensure the installation space for the first burner.
  • a boiler according to one aspect of the present invention may include: a water-cooling wall provided along a furnace bottom of the furnace and a side wall of the lower portion of the furnace; and a refractory provided between the water-cooling wall and a flame formed by the second burner.
  • the refractory is provided between the water-cooling wall and the flame formed by the second burner. It is thereby possible to reduce the heat exchange between the flame and the water-cooling wall, so that the flame formed by the second burner is less likely to be cooled by the water-cooling wall. Thereby, the combustion temperature of the flame formed by the second burner can be kept high, thus promoting the combustion of the fuel by the second burner. Hence the oxygen content of the flue gas generated by the combustion in the second burner is reduced, so that an inert gas having a lower oxygen content can be generated by the second burner. Further, since the water-cooling wall and the flame do not come into direct contact, it is possible to prevent the generation of carbon monoxide caused by quenching of the flame.
  • the second burner is disposed in the lower portion of the furnace. This makes it possible to limit the range of the flame formed by the second burner and to thereby reduce the range in which the refractory is provided.
  • the refractory is provided at the bottom of the furnace and in the lower periphery of the furnace, it is possible to facilitate the work of installing the refractory.
  • a boiler according to one aspect of the present invention may include a wind box that supplies combustion air to the second burner; and a fan that supplies a seal gas into the wind box during operation of the first burner and stoppage of the second burner.
  • seal air is supplied into the wind box surrounding the second burner during the operation of the first burner and the stoppage of the second burner.
  • the furnace is filled with a high-temperature combustion gas due to the flame formed by the first burner.
  • the seal gas is supplied into the wind box surrounding the second burner, the high-temperature combustion gas is prevented by the seal gas from flowing into the wind box from the furnace. Therefore, during the stoppage of the second burner, the high-temperature combustion gas does not flow into the wind box surrounding the second burner, and the second burner is not exposed to the high-temperature combustion gas.
  • the second burner can be prevented from being damaged by the heat of the flame formed by the first burner.
  • a ship includes a boiler according to any one of the aforementioned aspects and a fuel tank to which the inert gas generated by the boiler is supplied.
  • the inert gas generated by the boiler is supplied to the fuel tank. That is, it is possible to use the flue gas of the boiler as an inert gas. Hence there is no need to separately provide a device for generating an inert gas, thereby enabling space-saving in the ship.
  • the boiler since the boiler generates an inert gas having an oxygen content at which no reaction occurs with a flammable gas, it is possible to supply the inert gas discharged from the boiler to the fuel tank without performing the process of further reducing the oxygen content in the inert gas.
  • a device for reducing the oxygen content so that it is possible to simplify the structure of the ship and save the space in the ship.
  • a ship according to one aspect of the present invention may include another boiler which is provided separately from the boiler and to which a fuel gas is supplied from the fuel tank.
  • the other boiler to which a fuel gas is supplied from the fuel tank, is provided separately from the boiler that generates an inert gas.
  • the fuel gas containing the inert gas discharged out of the fuel tank can be combusted and oxidized in the other boiler.
  • a gas fuel unit e.g., gas combustion unit (GCU)
  • steam can be generated while the fuel gas discharged out of the fuel tank is combusted in the other boiler, so that the energy efficiency of the entire ship can be improved when the generated steam is utilized in the ship or when power is generated by driving a generator turbine with the generated steam.
  • a method for generating an inert gas in a boiler including a furnace, a first burner that combusts fuel in the furnace, a second burner that is provided separately from the first burner and combusts fuel in the furnace to generate an inert gas having an oxygen content at which no reaction occurs with a flammable gas, and a steam generation unit that generates steam by using a combustion flue gas generated in the furnace, the method including: a second burner combustion step of combusting the fuel only in the second burner; and a steam generation step of generating steam in the steam generation unit.
  • FIG. 1 A first embodiment of the present invention will be described below using Figs. 1 to 3 .
  • the ship according to the present embodiment is, for example, an LNG carrier 1 that transports an LNG.
  • the LNG carrier 1 is mounted with an LNG tank (fuel tank) 2 that stores an LNG at the time of transportation, and a boiler 3 that generates an inert gas to be supplied to the LNG tank 2 at the time of inspection and repair of the LNG tank 2.
  • LNG tank fuel tank
  • boiler 3 that generates an inert gas to be supplied to the LNG tank 2 at the time of inspection and repair of the LNG tank 2.
  • the boiler 3 is connected to the LNG tank 2 through an inert gas supply pipe 4.
  • Inert gas flows inside the inert gas supply pipe 4, and a combustion gas generated in the boiler 3 is supplied to the LNG tank 2 through the inert gas supply pipe 4.
  • the inert gas supply pipe 4 is provided with a scrubber 5, a cooler 6, a dryer 7, and a booster fan 8 in order from the upstream side of the combustion gas flow.
  • the combustion gas flowing through the inert gas supply pipe 4 is cleaned by the scrubber 5 removing sulfur components, soot and the like.
  • the cleaned combustion gas is cooled by the cooler 6 and is then dried by the dryer 7.
  • the dried combustion gas is supplied as an inert gas into the LNG tank 2 by the booster 8.
  • a combustion gas discharge pipe 9 is branched off from the inert gas supply pipe 4 between the boiler 3 and the scrubber 5. A part of the combustion gas generated in the boiler 3 is discharged from a stack (not illustrated) through the combustion discharge pipe 9.
  • a vent pipe 10 is connected to the LNG tank 2.
  • the fuel gas, discharged by the inert gas being supplied into the LNG tank 2 is discharged to the atmosphere through the vent pipe 10.
  • the inert gas is discharged to the atmosphere through the vent pipe 10.
  • the boiler 3 includes a furnace 16 that combusts a combustion gas, and a steam generation unit 17 that generates steam by using the combustion gas generated in the furnace 16.
  • the furnace 16 is a space surrounded by side water-cooling walls 32, a ceiling water-cooling wall 22, and a bottom water-cooling wall 33.
  • the side water-cooling wall 32 is provided along the side wall constituting the lateral side of the furnace
  • the bottom water-cooling wall 33 is provided along the furnace bottom constituting the lower portion of the furnace 16
  • the ceiling water-cooling wall 22 is provided along a ceiling constituting the upper portion of the furnace 16.
  • the side water-cooling wall 32 includes a front-surface water-cooling wall 23 constituting the front surface (the upward surface in Fig. 3 ) of the furnace 16, a rear-surface water-cooling wall 43 constituting the rear surface of the furnace 16, and a side-surface water-cooling wall 44 constituting the surface except for the front and rear surfaces of the furnace 16.
  • Each of the side water-cooling walls 32 is provided with a plurality of water wall tubes 34 extending in the vertical direction and arranged in parallel with predetermined intervals, and water or steam is flowing inside the water wall tube 34.
  • the ceiling water-cooling wall 22 and the bottom water-cooling wall 33 also have substantially the same configuration as the side water-cooling wall 32.
  • a plurality of water wall tubes 34 constituting the ceiling water-cooling wall 22 and the bottom water-cooling wall 33 extend in the horizontal direction. In Fig. 2 , the water wall tubes 34 are omitted for the illustration.
  • the furnace 16 includes an upper burner (first burner) 18 installed in the upper portion of the furnace 16, an upper wind box 19 surrounding the upper burner 18, a lower burner (second burner) 20 installed in the lower portion of the furnace 16, and a lower wind box 21 surrounding the lower burner 20.
  • the upper burner 18 is provided on the ceiling water-cooling wall 22 and forms a flame downward.
  • the upper burner 18 performs combustion using, as fuel, the LNG in the LNG tank 2 or oil supplied from an oil supply device.
  • the lower burner 20 is provided on the front-surface water-cooling wall 23 and forms a flame in a direction which is horizontal and in which the steam generation unit 17 is not provided. That is, the lower burner 20 forms a flame from the front surface toward the rear surface of the furnace 16. By forming a flame in this manner, the flame does not directly touch components and the like constituting the steam generation unit 17, thus enabling the prevention of damage to the components constituting the steam generation unit 17.
  • the lower burner 20 performs combustion using, as fuel, oil supplied from the oil supply device.
  • the lower burner 20 is a small-capacity burner capable of forming a flame by using less combustion air per unit fuel than the upper burner 18.
  • the lower burner 20 is disposed so as to ensure the length of the flame. Note that Figs. 2 and 3 illustrate an example in which one each of the upper burner 18 and the lower burner 20 is provided, but two or more each of the upper burners 18 and the lower burners 20 may be provided.
  • the steam generation unit 17 includes a front bank tube 28 disposed on the boundary with the furnace 16, an steam generating tubes 29 disposed on the downstream side of the combustion gas flow of the front bank tube 28 and extending in the vertical direction, a partition plate 41 provided at the substantially central position in the vertical direction of the steam generating tubes 29, a water drum 30 provided below the steam generating tubes 29, a steam drum 31 provided above the steam generating tubes 29, and a combustion gas discharge duct 38 connected to the inert gas supply pipe 4.
  • a bottom refractory (refractory) 35 is provided so as to cover the bottom water-cooling wall from above.
  • a side refractory 36 is provided so as to cover the rear-surface water-cooling wall 43 and the side-surface water-cooling wall 44 in the direction from the center of the furnace 16.
  • the bottom refractory 35 and the side refractory 36 are provided respectively between the bottom water-cooling wall 33 and the flame formed by the lower burner 20 and between the side water-cooling wall 32 and the flame.
  • a ceiling refractory 37 is provided between the front bank tube 28 and the ceiling portion 22.
  • the boiler 3 externally has a forced draft (FD) fan 24 that supplies combustion air to the upper burner 18 and the lower burner 20, an upper-burner air supply line 25 configured to supply the combustion air from the FD fan 24 to the upper burner 18 via the upper wind box 19, and a lower-burner air supply line 26 that is branched off from the upper-burner air supply line 25 and configured to supply the combustion air from the FD fan 24 to the lower burner 20 via the lower wind box 21.
  • the lower-burner air supply line 26 is provided with a flow regulating valve 27 that regulates the flow rate of the flowing combustion air.
  • the boiler 3 externally has a steam supply pipe 39 (cf. Fig. 1 ) that supplies steam generated in the boiler 3 to a steam turbine (not illustrated) and equipment using steam, a fuel supply pipe 40 (cf. Fig. 1 ) that supplies fuel such as light oil from a fuel supply device (not illustrated) to the upper burner 18 and the lower burner 20, and a fuel gas supply pipe 11 that supplies fuel out of the LNG tank 2 to the upper burner 18 and the lower burner 20.
  • the lower burner 20 combusts the fuel supplied through the fuel supply pipe 40 to form a flame (second burner combustion step).
  • the lower burner 20 is a small-capacity burner for forming a flame by using less combustion air per unit fuel and is disposed so as to ensure the length of the flame, so that the space in the furnace can be used effectively, and the combustion gas generated by the combustion in the lower burner 20 has a low oxygen content.
  • the oxygen content of the combustion gas introduced into the steam generation unit 17 is in a low state.
  • the combustion gas introduced into the steam generation unit 17 has an oxygen content of 1% or less.
  • the combustion gas introduced into the steam generation unit 17 passes through the front bank tube 28 and the steam generating tubes 29 in this order to generate steam by the heat exchange with water or water vapor flowing inside the front bank tube 28 and the steam generating tubes 29 (steam generation step).
  • the combustion gas flows so as to turn at the partition plate 41.
  • the combustion gas having completed the heat exchange flows from the combustion gas discharge hole 38 into the inert gas supply pipe 4 as an inert gas.
  • the inert gas having flown into the inert gas supply pipe 4 passes through the scrubber 5, the cooler 6, and the dryer 7 and is supplied into the LNG tank 2 by the booster 8.
  • the fuel is supplied only to the upper burner 18, and the fuel is not supplied to the lower burner 20. That is, the combustion is performed only in the upper burner 18, and the combustion is not performed in the lower burner 20.
  • the opening of the flow regulating valve 27 provided in the lower-burner air supply line 26 is regulated to supply a small amount of air into the lower wind box 21.
  • the air supplied into the lower wind box 21 flows into the furnace 16 via the lower wind box 21 and thereby serves as cooling air and seal air to prevent the high-temperature combustion gas or the like of the furnace 16 from flowing into the lower wind box 21.
  • the air flowing through the lower-burner air supply line 26 serves as the combustion air when the combustion is performed in the lower burner 20 (i.e., when an inert gas is generated), and serves as the seal air and the cooling air when the combustion is performed only in the upper burner 18 while the combustion is not performed in the lower burner 20 (i.e., when only steam is generated) .
  • the lower burner 20 for generating an inert gas in the furnace 16 is provided. It is thereby possible to generate, in the boiler 3, an inert gas having an oxygen content of 1% or less, at which no reaction occurs with a flammable gas, without providing a dedicated device for generating an inert gas (inert gas generator (IGG), etc.). Further, it is possible to generate steam by using energy that occurs at the time of generating the inert gas.
  • the upper burner 18 is disposed in the upper portion of the furnace 16, and the lower burner 20 is disposed in the lower portion of the furnace 16. This enables the upper burner 18 and the lower burner 20 to be disposed at positions apart from each other. It is thus possible to prevent the upper burner 18 from being damaged by the radiant heat of the flame of the lower burner 20, while simultaneously preventing the lower burner 20 from being damaged by the radiant heat of the flame of the upper burner 18. Further, with the upper burner 18 forming the flame downward, the heat flux of the flame of the upper burner 18 decreases in the lower portion of the furnace 16. Thus, by disposing the lower burner 20 in the lower portion of the furnace 16, it is possible to further prevent the lower burner 20 from being damaged by the flame of the upper burner 18.
  • the lower burner 20 is disposed apart from the upper burner 18 and thus does not affect the space in which the upper burner 18 is disposed. Hence it is possible to sufficiently ensure the installation space for the upper burner 18.
  • the side refractory 36 and the bottom refractory 35 are provided respectively between the side water-cooling wall 32 and the flame formed by the lower burner 20 and between the bottom water-cooling wall 33 and the flame. It is thereby possible to reduce the heat exchange between the flame formed by the lower burner 20 and the side water-cooling wall 32 and between the flame and the bottom water-cooling wall 33, so that the flame formed by the lower burner 20 is less likely to be cooled by the side water-cooling wall 32 and the bottom water-cooling wall 33. Thereby, the combustion temperature of the flame formed by the lower burner 20 can be kept high, thus promoting the combustion of the fuel by the lower burner 20.
  • the oxygen content of the combustion gas generated by the combustion in the lower burner 20 is reduced, so that an inert gas having a lower oxygen content can be generated in the furnace 16.
  • the flame formed by the lower burner 20 does not come into direct contact with the side water-cooling wall 32 or the bottom water-cooling wall 33, it is possible to prevent the generation of carbon monoxide caused by quenching of the flame.
  • the refractory is not provided so as to cover the entire surface of the side water-cooling wall 32 of the furnace 16. Specifically, the refractory is not provided on the front-surface water-cooling wall 23 where the lower burner 20 is provided. With such a configuration formed, it is possible to ensure the heat absorption in the furnace 16.
  • the lower burner 20 is disposed in the lower portion of the furnace 16. This makes it possible to limit the range of the flame formed by the lower burner 20 and to thereby reduce the range in which the refractory is provided. In addition, since the refractory is provided at the bottom of the furnace 16 and in the lower portion of the furnace 16, it is possible to facilitate the work of installing the refractory.
  • a seal gas is supplied into the lower wind box 21 surrounding the lower burner 20 during the operation of the upper burner 18 and the stoppage of the lower burner 20.
  • the furnace 16 is filled with a high-temperature combustion gas due to the flame formed by the upper burner 18.
  • the seal gas is supplied into the lower wind box 21 surrounding the lower burner 20
  • the high-temperature combustion gas is prevented by the seal gas from flowing into the wind box 21 from the furnace 16. Therefore, during the stoppage of the lower burner 20, the high-temperature combustion gas does not flow into the lower wind box 21, and the lower burner 20 is not exposed to the high-temperature combustion gas.
  • the seal gas has a low temperature and can thus cool the lower burner 20, thereby preventing the lower burner 20 from being damaged.
  • the inert gas generated by the boiler 3 is supplied to the fuel tank. That is, it is possible to use the combustion flue gas of the boiler 3 as an inert gas. Hence there is no need to separately provide a device for generating an inert gas, thus enabling space-saving in the LNG carrier 1. Moreover, since the boiler 3 generates the inert gas having an oxygen content of 1 % or less, at which no reaction occurs with a flammable gas, it is possible to supply the inert gas discharged from the boiler 3 to the LNG tank 2 without performing the process of further reducing the oxygen content in the inert gas.
  • the present embodiment basically has a similar structure to the first embodiment and is different from the first embodiment mainly in that an LNG carrier 60 is equipped with two boilers having different features. Therefore, the same constituents as those of the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.
  • the LNG carrier 60 includes a flammable gas supply pipe 51 branched off from the vent pipe 10.
  • the first flammable gas supply pipe 51 is connected to the boiler 50, and a flammable fuel gas in the LNG tank 2 is supplied to the boiler 50 by a supply compressor 52 provided in the middle position of the flammable gas supply pipe 51.
  • a second flammable gas supply pipe 54 for supplying a flammable gas from the LNG tank 2 to the boiler 56 is branched off from the middle position of the first flammable gas supply pipe 51.
  • the second flammable gas supply pipe 54 may not be branched from the middle position of the flammable gas supply pipe 51 but may be provided so as to directly connect the LNG tank 2 and the boiler 56.
  • the boiler 56 has substantially the same configuration as the boiler 3 described in the first embodiment, but the burner provided is different from that in the boiler 3. Specifically, only a burner 55 for generating an inert gas with a low oxygen content is provided in the boiler 56, and the burner 55 is provided in the upper part of the boiler 56.
  • the boiler 50 has substantially the same configuration as the boiler 3 described in the first embodiment but is different from the boiler 3 in not including the lower burner 20 that generates an inert gas with a low oxygen content, the lower wind box 21, the side refractory 36, or the bottom refractory 35.
  • the boiler 50 to which the flammable fuel gas is supplied from the LNG tank 2, is provided separately from the boiler 56 that generates an inert gas.
  • the flammable fuel gas and the inert gas discharged out of the LNG tank 2 can be combusted in the boiler 50. Therefore, steam can be generated while the flammable fuel gas and the inert gas discharged out of the LNG tank 2 are combusted in the boiler 50, so that the energy efficiency of the entire LNG carrier 1 can be improved by utilizing the steam in the equipment in the LNG carrier 1.
  • the boiler 56 and the boiler 50 have been the boilers with different structures from the structure of the boiler 3 described in the first embodiment, but the boiler 56 and the boiler 50 may have the same structure as that of the boiler 3.
  • the refractory has not been provided on the entire surface of the furnace 16, and the refractory has not been provided on the surface where the lower burner 20 is provided, but the refractory may be provided on the entire surface of the side wall 23 of the furnace 16.
  • the heat exchange between the flame formed by the lower burner 20 and the side water-cooling wall 32 can further be reduced, and the combustion temperature of the flame formed by the lower burner 20 can be kept high.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ocean & Marine Engineering (AREA)
  • Air Supply (AREA)
  • Combustion Of Fluid Fuel (AREA)
EP18761294.0A 2017-02-28 2018-01-10 Chaudière, navire doté de chaudière, et procédé de production de gaz inerte Active EP3591291B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017035870A JP6879778B2 (ja) 2017-02-28 2017-02-28 ボイラ及びボイラを備えた船舶並びにイナートガスの生成方法
PCT/JP2018/000374 WO2018159106A1 (fr) 2017-02-28 2018-01-10 Chaudière, navire doté de chaudière, et procédé de production de gaz inerte

Publications (3)

Publication Number Publication Date
EP3591291A1 true EP3591291A1 (fr) 2020-01-08
EP3591291A4 EP3591291A4 (fr) 2020-02-19
EP3591291B1 EP3591291B1 (fr) 2021-02-24

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EP18761294.0A Active EP3591291B1 (fr) 2017-02-28 2018-01-10 Chaudière, navire doté de chaudière, et procédé de production de gaz inerte

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EP (1) EP3591291B1 (fr)
JP (1) JP6879778B2 (fr)
KR (1) KR102286089B1 (fr)
CN (1) CN110337567B (fr)
DK (1) DK3591291T3 (fr)
WO (1) WO2018159106A1 (fr)

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JP7292898B2 (ja) * 2019-02-22 2023-06-19 三菱重工マリンマシナリ株式会社 ボイラ

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Publication number Priority date Publication date Assignee Title
GB376618A (en) * 1930-11-26 1932-07-14 Babcock & Wilcox Co Improvements in fire protection systems for oil tanks
JPS5916777B2 (ja) 1978-03-22 1984-04-17 株式会社日立メデイコ 超音波診断装置
JPS54183739U (fr) * 1978-06-16 1979-12-26
JPS5781999U (fr) * 1980-11-07 1982-05-20
JPS6124400U (ja) * 1984-07-19 1986-02-13 石川島播磨重工業株式会社 船舶等のイナ−トガスヂエネレ−タ
JPS629103A (ja) * 1985-07-03 1987-01-17 大谷開発株式会社 ボイラ−の火炎導管構造
JP3481184B2 (ja) * 2000-05-09 2003-12-22 川崎重工業株式会社 Ｌｎｇ船の推進装置用ボイラの制御方法
CN101270873B (zh) * 2007-03-23 2011-06-15 宝山钢铁股份有限公司 一种向纯氧冶炼移动填充床熔炼炉喷吹煤粉方法及其装置
JP5022204B2 (ja) * 2007-12-17 2012-09-12 三菱重工業株式会社 舶用ボイラ構造
US8123150B2 (en) * 2010-03-30 2012-02-28 General Electric Company Variable area fuel nozzle
JP5812844B2 (ja) * 2011-12-15 2015-11-17 三菱重工業株式会社 舶用ボイラ
CN102997276A (zh) * 2012-12-26 2013-03-27 北京国电蓝天节能科技开发有限公司 辐射强化燃烧锅炉炉膛
JP5901671B2 (ja) * 2014-02-25 2016-04-13 三菱重工業株式会社 排ガス再循環システム及びそれを備えた船用ボイラ、並びに排ガス再循環方法

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KR20190110113A (ko) 2019-09-27
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EP3591291B1 (fr) 2021-02-24
JP6879778B2 (ja) 2021-06-02
CN110337567A (zh) 2019-10-15
KR102286089B1 (ko) 2021-08-04
WO2018159106A1 (fr) 2018-09-07
EP3591291A4 (fr) 2020-02-19
CN110337567B (zh) 2021-11-09

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