CN106061829B - 用于处理蒸发气体的系统和方法 - Google Patents

用于处理蒸发气体的系统和方法 Download PDF

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CN106061829B
CN106061829B CN201580010007.4A CN201580010007A CN106061829B CN 106061829 B CN106061829 B CN 106061829B CN 201580010007 A CN201580010007 A CN 201580010007A CN 106061829 B CN106061829 B CN 106061829B
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gas
boil
compressed
liquefied natural
ship
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CN106061829A (zh
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李昌雨
文荣植
兪炳瑢
金洛贤
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Hanwha Ocean Co Ltd
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Daewoo Shipbuilding and Marine Engineering Co Ltd
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H21/00—Use of propulsion power plant or units on vessels
    • B63H21/38—Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0022—Hydrocarbons, e.g. natural gas
    • F25J1/0025—Boil-off gases "BOG" from storages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
    • F02M21/0209—Hydrocarbon fuels, e.g. methane or acetylene
    • F02M21/0212—Hydrocarbon fuels, e.g. methane or acetylene comprising at least 3 C-Atoms, e.g. liquefied petroleum gas [LPG], propane or butane
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    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0287—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers characterised by the transition from liquid to gaseous phase ; Injection in liquid phase; Cooling and low temperature storage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
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    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
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    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
    • F17C9/04—Recovery of thermal energy
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F17C2221/00—Handled fluid, in particular type of fluid
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    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
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    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/033—Small pressure, e.g. for liquefied gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
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    • F17C2223/04—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by other properties of handled fluid before transfer
    • F17C2223/042—Localisation of the removal point
    • F17C2223/043—Localisation of the removal point in the gas
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    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
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    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
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Abstract

本发明提供一种用于处理蒸发气体的系统和方法。本发明的用于处理蒸发气体的系统包括：压缩器，其压缩在设置于船只或船舶结构中的储罐中产生的蒸发气体；压缩气体热交换器，其设置于压缩器的下游，且经压缩的蒸发气体在压缩气体热交换器中与海水或淡水进行热交换；以及蒸发气体热交换器，其设置于压缩气体热交换器的下游，且经压缩的蒸发气体在蒸发气体热交换器中与待馈送到压缩器的蒸发气体进行热交换。本发明的系统处理蒸发气体时，有可能通过防止储罐的压力增加而确保稳定性且减少GCU和类似的装置中的蒸发气体的消耗。

Description

用于处理蒸发气体的系统和方法
技术领域
本发明涉及一种用于处理蒸发气体的系统和方法，且更具体地说，涉及一种蒸发气体处理系统，其包含：压缩器，其经配置以压缩在船只或船舶结构的储罐中产生的蒸发气体；压缩气体热交换器，其安置在压缩器的下游并执行经压缩蒸发气体与海水或淡水的热交换；以及蒸发气体热交换器，其安置在压缩气体热交换器的下游并执行经压缩蒸发气体与待供应到压缩器的蒸发气体的热交换。
背景技术
液化天然气(Liquefied Natural Gas，简称：LNG)为通过将主要由甲烷(methane)组成的天然气冷却到约-163℃而获得的无色透明液体，且其具有为天然气的体积的约1/600的体积。因此，将天然气液化成液化天然气以用于高效运输，且LNG运输船只用于液化天然气的船舶运输。
由于天然气的液化在环境压力下在约-163℃的低温温度下发生，所以LNG的温度在环境压力下增加到稍高于-163℃，LNG就有可能汽化。尽管隔离设置到LNG运输船只、LNG-FPSO、RV和类似的LNG储罐，但不可能完全阻止热量进入LNG储罐中的LNG，且因此，在LNG存储于LNG存储槽中期间，LNG连续地汽化而在LNG储罐中产生蒸发气体(Boil-Off Gas，简称：BOG)。
BOG是一种LNG损失且被视为LNG的运输效率中的重要因素，且由于LNG储罐内BOG的过多积蓄可能通过LNG储罐的压力过度增加而导致对LNG储罐的损坏，所以已作出各种研究以开发用于处理在LNG储罐中产生的BOG的方法。
最近，对于BOG的处理，已经使用了在BOG再液化之后将BOG返还到储罐的方法、使用BOG作为船只的能量来源的方法和类似方法。另外，已经使用了利用气体燃烧装置(gascombustion unit，简称：GCU)燃烧过量BOG的方法。
发明内容
技术问题
本发明的实施例提供一种用于高效且稳定地处理在例如LNG-RV或LNG-FSRU的船只或船舶结构的储罐中产生的蒸发气体(Boil-OffGas)的系统和方法。
技术解决方案
根据本发明的一个方面，提供一种蒸发气体处理系统，其包含：压缩器，其压缩在设置到船只或船舶结构的储罐中产生的蒸发气体；
压缩气体热交换器，其安置在所述压缩器的下游并执行所述经压缩蒸发气体与海水或淡水的热交换；以及
蒸发气体热交换器，其安置在所述压缩气体热交换器的下游并执行所述经压缩蒸发气体与待供应到所述压缩器的蒸发气体的热交换。
所述蒸发气体处理系统可进一步包含：再冷凝器，其再冷凝通过所述压缩器压缩的所述蒸发气体；压缩气体供应管线，其在所述压缩器的下游侧连接到所述再冷凝器，并包括所述压缩气体热交换器和所述蒸发气体热交换器；以及旁路管线，其在所述压缩气体热交换器的下游侧从所述压缩气体供应管线分支出，以允许经进一步压缩的蒸发气体在绕过所述蒸发气体热交换器之后供应到所述再冷凝器。
所述蒸发气体处理系统可进一步包含：第一控制阀，其安置在所述旁路管线自所述压缩气体供应管线分支的分支点之后；以及第二控制阀，其设置到所述旁路管线，并且，可通过控制所述第一控制阀和第二控制阀来调节引入到所述再冷凝器中的所述经压缩蒸发气体的温度。
所述蒸发气体处理系统可进一步包含：液化天然气供应管线，经超冷却的液化天然气通过所述液化天然气供应管线从所述储罐供应到所述再冷凝器；以及传送泵，其设置到所述储罐并将所述液化天然气泵送到所述液化天然气供应管线中。
所述蒸发气体处理系统可进一步包含：高压泵，其安置在所述再冷凝器的下游并压缩所述液化天然气；以及气化器，其从所述高压泵接收所述经压缩液化天然气并气化所述所接收的液化天然气。
所述蒸发气体处理系统可进一步包含：气体管线，其在所述压缩气体热交换器的下游侧从所述压缩气体供应管线分支出，并将所述经压缩蒸发气体供应到所述船只或所述船舶结构的气体消耗侧。
所述蒸发气体处理系统可进一步包含：线上混合器(in-line mixer)，其安置在所述压缩器的上游，且当所述储罐中产生的所述蒸发气体具有高温时，通过使所述蒸发气体与所述储罐中的LNG混合来冷却待供应到所述压缩器的所述蒸发气体。
所述船只或所述船舶结构可包含LNG-RV(再气化船只，Regasification Vessel)和LNG-FSRU(浮动存储和再气化装置，Floating Storage and Regasification Unit)。
根据本发明的另一个方面，提供一种处理蒸发气体的方法，其包含：1)压缩在设置到船只或船舶结构的储罐中产生的蒸发气体；2)冷却所述经压缩蒸发气体；以及3)将经超冷却的LNG从所述储罐供应到所述经压缩和冷却的蒸发气体以再冷凝所述蒸发气体，其中，在2)冷却所述经压缩蒸发气体中，通过与在所述储罐中产生的并将经压缩的蒸发气体的热交换来冷却所述经压缩蒸发气体。
有利效果
在根据本发明的实施例的蒸发气体处理系统中，在船只或船舶结构的储罐中产生的蒸发气体经压缩和冷却，且接着通过从储罐供应的经超冷却的液化天然气的冷热再冷凝，其中经压缩蒸发气体通过与在储罐中产生并将经压缩的蒸发气体的热交换而冷却。
由于此类经压缩蒸发气体通过压缩气体热交换器中的海水或淡水而冷却且接着另外在引入到再冷凝器中之前通过待供应到压缩器的蒸发气体而冷却，所以可改进再冷凝器中的蒸发气体的冷凝效率，且由于经压缩蒸发气体通过从储罐供应的蒸发气体的冷热而冷却，所以有可能减少再冷凝器所需的经超冷却的液化天然气的量。
另外，当通过此类系统处理蒸发气体时，有可能通过防止储罐的压力增加而确保稳定性且减少GCU和类似的装置中的蒸发气体的消耗。
附图说明
图1为蒸发气体处理系统的一个实例的示意图。
图2为根据本发明的一个例示性实施例的蒸发气体处理系统的示意图。
具体实施方式
本发明的上述和其它方面、优点以及目标将从附图和本发明的以下例示性实施例的描述变得显而易见。
下文将参照附图来详细描述本发明的例示性实施例。类似参考标号将表示类似组件。
以下蒸发气体处理系统可应用于装备有其中产生蒸发气体的LNG储罐的船只或船舶结构。举例来说，蒸发气体处理系统可应用于LNG-RV(再气化船只，RegasificationVessel)、LNG-FSRU(浮动存储再气化装置，Floating Storage Regasification Unit)和类似的装置，其将通过LNG的再气化将天然气供应到陆上。
尽管其可取决于储罐的容量和外部温度而变化，但此项技术中已知是，在具有150000m3容量的船只中，在LNG储罐中产生的BOG的量在满载条件下在3吨/h到4吨/h的范围内或在压载条件下在0.3吨/h到0.4吨/h的范围内。最近，由于蒸发速率BOR(Boil-OffRate)往往会归因于船只的隔离性能改进而减小，所以蒸发气体的产生量已逐渐减小。
然而，由于储罐仍然产生大量蒸发气体，所以需要高效蒸发气体处理系统以便确保船只或船舶结构的稳定性以及储罐的稳定性且不消耗天然气。
图1为蒸发气体处理系统的一个实例的示意图。
参考图1，蒸发气体处理系统将液化天然气从储罐T泵送并供应到再冷凝器20，以通过用于在高压力下压缩蒸发气体的泵40和气化器50将天然气供应到陆上，其中在储罐T中产生的蒸发气体通过压缩器10压缩并供到再冷凝器20。在再冷凝器20中，蒸发气体通过与由泵30从储罐T泵送到再冷凝器20的经超冷却的液化天然气的热交换而再冷凝，且接着以液体状态供应到泵40。
在此类系统中，由于通过压缩增加了蒸发气体的温度，所以在再冷凝蒸发气体时，大量蒸发气体需要大量液化天然气，且当将经历再气化的液化天然气的量较小时，难以将足够的冷热转移到蒸发气体。
图2为根据本发明的一个例示性实施例的经开发以解决此类问题的蒸发气体处理系统的示意图。
参考图2，根据此实施例的蒸发气体处理系统包含：压缩器100，其压缩在设置到船只或船舶结构的储罐T中产生的蒸发气体；压缩气体热交换器300，其安置在压缩器100的下游并执行经压缩蒸发气体与海水或淡水的热交换；蒸发气体热交换器200，其安置在压缩气体热交换器300的下游并执行经压缩蒸发气体与待供应到压缩器100的蒸发气体的热交换；以及再冷凝器(recondensor)400，其再冷凝通过压缩器100压缩的蒸发气体。
从压缩器100的下游侧连接到再冷凝器400的压缩气体供应管线GL装备有压缩气体热交换器300和蒸发气体热交换器200，且旁路管线BL在压缩气体热交换器300的下游侧从压缩气体供应管线GL分支出，以允许经压缩的蒸发气体在绕过(bypass)蒸发气体热交换器200之后通过旁路管线BL供应到再冷凝器400。
压缩气体供应管线GL在旁路管线BL的分支点之后装备有第一控制阀430，且旁路管线BL装备有第二控制阀450。通过控制第一控制阀430和第二控制阀450调节经压缩蒸发气体通过压缩气体供应管线GL和旁路管线BL中的每一个流动到再冷凝器400中的流动速率，借以可调节引入到再冷凝器400中的经压缩蒸发气体的温度。
举例来说，当大量液化天然气将供应到再冷凝器400时，第一控制阀430关闭以允许总量的经压缩蒸发气体在不经过蒸发气体热交换器200的情况下通过旁路管线BL供应到再冷凝器400。
在此情况下，由于大量经超冷却的液化天然气引入到再冷凝器400中，所以经压缩蒸发气体可在不经过蒸发气体热交换器200的情况下再冷凝，且由于蒸发气体在引入到压缩器100中之前不会通过蒸发气体热交换器200中的热交换而加热，所以经压缩蒸发气体的温度在压缩器100的下游侧降低，借此减小压缩气体热交换器300的负载(load)。
当在储罐T中产生的蒸发气体具有约-120℃的温度时，通过压缩器100压缩的蒸发气体可经由压缩气体热交换器300通过蒸发气体热交换器200冷却到-50℃到-100℃且接着可供应到再冷凝器400。
当引入到压缩器100中时，在储罐T中产生的蒸发气体的温度已通过与经压缩蒸发气体的热交换而增加。接着，蒸发气体通过压缩器100压缩，在压缩气体热交换器300中通过与具有约10℃到40℃的温度的海水或淡水的热交换而冷却，且接着另外在蒸发气体热交换器200中冷却。
另一方面，经超冷却的液化天然气通过液化天然气供应管线LL从储罐T供应到再冷凝器400。为此目的，储罐T装备有将经超冷却的液化天然气泵送到液化天然气供应管线LL的传送泵500。
当经超冷却的液化天然气通过传送泵500泵送且供应到再冷凝器400时，经压缩和冷却的蒸发气体与经超冷却的液化天然气混合以再冷凝成液体状态的液化天然气。
高压泵600和气化器700安置在再冷凝器400的下游以压缩和气化从再冷凝器400供应的液化天然气，使得天然气可供应到陆上G。
气体管线SL在压缩气体热交换器300的下游侧从压缩气体供应管线GL分支出，以将经压缩蒸发气体供应到船只或船舶结构的气体消耗侧S1、S2、S3。此类气体消耗侧的实例可包含气体引擎，例如DFDE或DFDG、锅炉、GCU(气体燃烧装置)和类似的装置。
当船只或船舶结构装备有DFDE时，压缩器100的后端的压力是5绝对巴(bara)到10绝对巴，优选地6绝对巴到7绝对巴，且再冷凝器400的压力可为4.5绝对巴到6绝对巴(3巴到5.5巴(barg))。
所述系统可操作以使得在储罐T中产生的蒸发气体可通过气体管线SL供应到船只或船舶结构的气体消耗侧S1、S2、S3并被所述气体消耗侧消耗，且剩余的蒸发气体可发送到再冷凝器400以通过经超冷却的液化天然气再冷凝。
线上混合器(in-line mixer，未展示)可安置在压缩器100的上游。当蒸发气体的温度由于少量液化天然气存储在储罐T中而增加时，蒸发气体通过线上混合器与储罐T中的液化天然气混合，借以蒸发气体可在经冷却之后供应到压缩器100。
所属领域的技术人员清楚，本发明不限于上述实施例，并且可以在不脱离本发明的范围的情况下作出各种修改或变化。

Claims (7)

1.一种蒸发气体处理系统，其特征在于包括：
压缩器，其压缩在设置到船只或船舶结构的储罐中产生的蒸发气体；
压缩气体热交换器，其安置在所述压缩器的下游并执行经压缩的所述蒸发气体与海水或淡水的热交换；
蒸发气体热交换器，其安置在所述压缩气体热交换器的下游并执行经压缩的所述蒸发气体与待供应到所述压缩器的蒸发气体的热交换；
再冷凝器，其再冷凝通过所述压缩器压缩的所述蒸发气体，其中所述蒸发气体在经由与所述压缩气体热交换器以及所述蒸发气体热交换器进行热交换之后，所述蒸发气体通过与从所述储罐排出的液化天然气混合以再冷凝；
高压泵，其安置在所述再冷凝器的下游并压缩所述液化天然气；
气化器，其从所述高压泵接收经压缩的所述液化天然气并气化所接收的所述液化天然气；
压缩气体供应管线，其在所述压缩器的下游侧连接到所述再冷凝器，并装备有所述压缩气体热交换器以及所述蒸发气体热交换器；以及
气体管线，其在所述压缩气体热交换器的下游侧从所述压缩气体供应管线分支出，并将经压缩的所述蒸发气体供应到所述船只或所述船舶结构的气体消耗侧，
其中经所述气化器气化的所述液化天然气供应至与所述气体消耗侧不同的气体消耗处。
2.根据权利要求1所述的蒸发气体处理系统，还包括：
旁路管线，其在所述压缩气体热交换器的下游侧从所述压缩气体供应管线分支出，以允许经进一步压缩的所述蒸发气体在绕过所述蒸发气体热交换器之后供应到所述再冷凝器。
3.根据权利要求2所述的蒸发气体处理系统，还包括：
第一控制阀，其安置在所述旁路管线自所述压缩气体供应管线分支的分支点之后；以及
第二控制阀，其设置到所述旁路管线，
其中通过控制所述第一控制阀以及所述第二控制阀调节引入到所述再冷凝器中的经压缩的所述蒸发气体的温度。
4.根据权利要求2所述的蒸发气体处理系统，还包括：
液化天然气供应管线，经超冷却的所述液化天然气通过所述液化天然气供应管线从所述储罐供应到所述再冷凝器；以及
传送泵，其设置到所述储罐并将所述液化天然气泵送到所述液化天然气供应管线中。
5.根据权利要求1所述的蒸发气体处理系统，还包括：
线上混合器，其安置在所述压缩器的上游，且当所述储罐中产生的所述蒸发气体具有高温时，通过使所述蒸发气体与所述储罐中的所述液化天然气混合来冷却待供应到所述压缩器的所述蒸发气体。
6.根据权利要求1所述的蒸发气体处理系统，其中所述船只或所述船舶结构是液化天然气再气化船只以及液化天然气浮动存储和再气化装置中的一个。
7.一种处理蒸发气体的方法，其特征在于包括：
1)通过压缩器压缩在设置到船只或船舶结构的储罐中产生的蒸发气体；
2)通过使用作为冷剂的海水或淡水以冷却经压缩的所述蒸发气体；
3)将经压缩的所述蒸发气体供应到船只或船舶结构的气体消耗侧；
4)通过使用作为冷剂的供应到所述压缩器的所述蒸发气体以再次冷却未供应到船只或船舶结构的气体消耗侧的剩余的所述蒸发气体；
5)剩余的所述蒸发气体通过与从所述储罐排出的液化天然气混合以再冷凝；
6)压缩所述液化天然气；
7)气化经压缩的所述液化天然气；以及
8)将经气化的所述液化天然气供应至与所述气体消耗侧不同的气体消耗处。
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