Incinerator for boil-off gas
A technology for evaporating gas and incinerators, which is applied in the field of liquefied natural gas carriers, and can solve the problems of large flame burners, huge flames, and high operating temperatures
Inactive Publication Date: 2007-11-21
哈姆沃西燃烧工程有限公司
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Problems solved by technology
However, such flame burners cannot simply be installed on LNG carriers for the following reasons: Flame burners are bulky, noisy, operate at high temperatures and produce large and highly visible flames, all of which (especially the latter) would be worrisome and potentially dangerous to the crew of the transport vessel and others in the vicinity
Method used
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Embodiment Construction
[0023] Referring first to FIG. 1 , there is generally indicated at 10 a LNG carrier. The carrier vessel 10 carries a cargo of liquefied natural gas 12 contained in isolated membrane tanks (isolated membrane tanks do not form part of the invention, which may be replaced by spherical tanks of the so-called MOSS type). The transport vessel 10 is driven by a propulsion system 16 which in this case comprises a diesel engine, but which could alternatively be a diesel generator system, a dual fuel system or a steam power system. (At this point it should be noted that even though there are steam boilers in which the boil-off gas can be burned, some additional means of handling the boil-off gas is required in case the boiler is unavailable for any reason).
[0024] Although the storage tank 14 is isolated, some cargo must evaporate during the voyage, so the transport ship 10 is equipped with a liquefaction device 18 connected to the storage tank 14 and operable to reliquefy the resulti...
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An incinerator (20) for disposing of boil-off gas on an LNG carrier comprises a combustion section (40) wherein the boil-off gas admitted at (42) is burned in the presence of combustion air admitted at (44), producing a flame (46) and combustion products (C). Dilution air (A) is delivered into the combustion section (40) and mixed with the combustion products (C) to produce a diluted mixture (M). The combustion section (40) has an inner wall (48) and an outer wall (50) together defining a first passage (52) through which the dilution air (A) is passed before being mixed with the combustion products (C), whereby the dilution air A cools the combustion section (40). The dilution air A in the first passage (52) also provides a thermally insulating layer limiting radial heat transmission from the combustion section (40). A proportion (A-) of the dilution air is mixed directly with the combustion products (C).
Description
technical field [0001] The present invention relates to an incinerator especially, but not necessarily exclusively, for the treatment of boil-off gas on board ships carrying cargoes of liquefied natural gas (LNG) by sea, commonly referred to as LNG carriers. Background technique [0002] Carrying LNG by sea has been carried for more than four decades, and most LNG carriers have been powered by steam turbines using boil-off gas from the cargo as fuel. If left unutilized, the boil-off gas is vented to the air and lost, so it is considered essentially free. [0003] Now commercial pressure is prompting it to change. Transportation of LNG becomes organized (and sometimes regulated) as a distinct operation from production and supply and needs to be considered separately. Boil-off gas is no longer considered free, and the emergence of a spot market for LNG increases the economic need for its carriers. Traditionally used steam propulsion is less economical than other propulsion ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): F23G7/08F23M5/08B63H21/20B63J99/00
CPCB63J2099/003B63J99/00F23G7/08F23M5/085Y02T70/5263Y02T70/50B63H21/20F23M5/08
Inventor 西蒙·马克·奥康纳理查德·詹姆斯·普赖斯奈杰尔·彼得·韦伯利马克·博斯
Owner 哈姆沃西燃烧工程有限公司