CN113330244A - 小型船舶用空间密集型液化天然气燃料供应系统 - Google Patents
小型船舶用空间密集型液化天然气燃料供应系统 Download PDFInfo
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- 239000000446 fuel Substances 0.000 title claims abstract description 86
- 239000007789 gas Substances 0.000 claims abstract description 89
- 239000002828 fuel tank Substances 0.000 claims abstract description 29
- 230000008016 vaporization Effects 0.000 claims abstract description 10
- 238000009834 vaporization Methods 0.000 claims abstract description 7
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 29
- 239000007788 liquid Substances 0.000 claims description 25
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 13
- 239000006200 vaporizer Substances 0.000 claims description 8
- 239000000498 cooling water Substances 0.000 claims description 6
- 238000001704 evaporation Methods 0.000 claims description 4
- 230000008020 evaporation Effects 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 20
- 239000003345 natural gas Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 3
- 238000002309 gasification Methods 0.000 description 2
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- 230000006837 decompression Effects 0.000 description 1
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
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- F17D1/00—Pipe-line systems
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Abstract
本发明的目的在于提供一种通过针对液化天然气(LNG)推进小型船舶的燃料供应系统进行优化而同时满足燃料供应稳定性和应用便利性以及空间密集型的小型船舶用空间密集型液化天然气(LNG)燃料供应系统,其特征在于,可以使得第一游离气体管路以及第二游离气体管路与所述液化天然气(LNG)燃料罐的蒸发空间一起起到缓冲器功能。
Description
技术领域
本发明涉及一种通过针对液化天然气(LNG)燃料推进船舶尤其是针对小型船舶进行优化而对燃料供应系统所占据的空间进行密集化的小型船舶用空间密集型液化天然气(LNG)燃料供应系统。
背景技术
在小型船舶的液化天然气(LNG)燃料供应系统(FGSS)中,为了将液化天然气(LNG)作为燃料进行供应而通过泵以及热交换机达到引擎所要求的一定的温度以及压力之后将气体状态的天然气供应到引擎中。即,在小型船舶中,为了满足作为燃料进行供应的天然气的一定压力,目前通常采用通过在液化天然气(LNG)燃料罐内部安装液化天然气供应泵(LNG FEED PUMP)而向引擎供应所需要的压力的泵加压方式,以及不安装泵而在罐内部将液化天然气(LNG)增压至引擎所需要的压力之后通过热交换机供应到引擎中的方式。
此外,目前分别独立地构成液化天然气(LNG)燃料罐的加压管路以及用于将经过加压的液化天然气(LNG)进行气化之后供应到引擎中的管路,但是并没有单独配备可以对在液化天然气(LNG)燃料罐中产生的蒸发气体(Boil Off Gas)进行处理的管路,因此在因为蒸发气体的生成量增加而导致液化天然气(LNG)燃料罐的压力升高时会直接排放到大气中。
与此同时,在小型船舶中,为了经济性以及应用便利性的目的而采用非泵式构成,液化天然气(LNG)燃料供应系统包括用于生成液化天然气(LNG)燃料罐的压力的压力生成用热交换机以及用于满足引擎所需要的温度的加热用热交换机。其中,作为热交换机的热源,使用经过加热的乙二醇,而作为用于对其进行加热的热源,则使用输入到引擎中进行循环的冷却水。
如上所述的小型船舶用液化天然气(LNG)燃料供应系统,要求即使是在恶劣天气下进行航行或引擎发生急剧的输出变化时也可以以一定压力以及温度持续地供应天然气。
目前,因为在引擎发生急剧的输出变化时无法满足引擎所需要的压力以及温度条件,因此经常会发生引擎效率下降以及转换成柴油模式的情况。这是因为引擎所需要的适当压力取决于液化天然气(LNG)燃料罐的压力,而在恶劣天气下进行航行或急剧加速时,伴随着供应到引擎中的天然气流量的增加,会发生瞬间压力下降的现象。此时,为了对降低的天然气提的压力进行补偿,需要通过对液化天然气(LNG)燃料罐的内部压力进行加压而维持适当的压力,但是因为与如上所述的用于维持液化天然气(LNG)燃料罐的内部压力的时间相比,在引擎的输出增加时因为天然气的流入流量增加而导致的液化天然气(LNG)燃料罐的压力下降时间更加快速,因此会导致引擎效率的下降以及转换成柴油模式的问题。
为了防止如上所述的问题,在最近的液化天然气(LNG)燃料供应系统中,通过在引擎的前端部安装可以对一定量的天然气进行存储的缓冲罐,以根据引擎的需求条件将缓冲罐内的天然气供应到引擎的方式实现缓冲器功能。
但是,因为所受到的空间限制较大的小型船舶的特性,具有为了追加安装上述的缓冲罐而需要额外分配相应空间的问题,因此急需开发出一种可以对其进行改善的新技术。
发明内容
本发明旨在解决如上所述的现有问题,其目的在于提供一种既可以应对在恶劣天气下进行航行以及引擎发生急剧的输出变化,还可以大幅减少现有的缓冲罐所占据的空间,从而将小型船舶的空间利用率极大化的小型船舶用空间密集型液化天然气(LNG)燃料供应系统。
与此同时,本发明的目的在于提供一种可以通过对用于对液化天然气(LNG)进行气化并供应到引擎中的管路以及用于对液化天然气(LNG)燃料罐内部的压力进行控制的管路进行整合而稳定地对液化天然气(LNG)燃料罐的压力进行控制,而且还可以对供应到引擎中的天然气的压力进行适当控制的小型船舶用空间密集型液化天然气(LNG)燃料供应系统。
此外,本发明的目的在于提供一种在从引擎水套冷却水(Jacket Water)的中间热介质(乙二醇)中接收用于对供应到引擎中的天然气进行气化的热源供应的构成中,中间热介质的流量以及温度变化会根据引擎的负荷变化发生较大的偏差,尤其是即使是在引擎的负荷较低的情况下也可以将中间热介质加热至适当温度的小型船舶用空间密集型液化天然气(LNG)燃料供应系统。
此外,本发明的其他目的以及优点将在下述内容中进行详细的说明,但是需要提前明确的是,本发明不仅包含在权利要求书中记载的事项以及在实施例中公开的内容,还包含可以轻易地从中推导出的范围内的手段以及组合。
为了达成如上所述的目的,适用本发明的小型船舶用空间密集型液化天然气(LNG)燃料供应系统,其特征在于,包括:第一游离气体管路,将液化天然气(LNG)燃料罐上部蒸发空间中的气体燃料导向供应到燃料消费场所;加热器,对从所述第一游离气体管路供应过来的气体燃料进行加热;气体管路,将在所述加热器中加热的气体燃料供应到燃料消费场所;液体管路,将液化天然气(LNG)燃料罐下部的液体燃料导向供应到燃料消费场所;蒸发器,将从所述液体管路供应过来的液体燃料气化成气体燃料;以及,第二游离气体管路,将从所述蒸发器供应过来的气体燃料汇流到第一游离气体管路;所述第一游离气体管路以及第二游离气体管路上的管道的截面积相对大于所述气体管路上的管道的截面积,在所述液化天然气(LNG)燃料罐、第一游离气体管路以及第二游离气体管路上维持相同的气体燃料压力的同时使其维持相对大于所述气体管路上的压力,从而使得第一游离气体管路以及第二游离气体管路与所述液化天然气(LNG)燃料罐的蒸发空间一起起到缓冲器功能。
此外,适用本发明的较佳实施例,其特征在于:在所述液体管路上,安装有用于稳定地维持所述燃料罐的压力的压力控制阀。
与此同时,适用本发明的较佳实施例,其特征在于:在所述第一游离气体管路上,安装有对供应到所述加热器中的气体燃料进行减压的减压阀,且在所述减压阀的前端,安装有防止经过减压并通过加热器的气体燃料发生逆流的止回阀。
此外,适用本发明的较佳实施例,其特征在于:所述热交换机以及加热器的热源是通过乙二醇供应管路供应,所述热源是被燃料需求场所的水套冷却水加热的中间热介质,在所述乙二醇供应管路上安装有电加热器,从而使得中间热介质的维持在适当的温度。
通过如上所述构成的本发明,可以达成如下所述的效果。
可以通过针对液化天然气(LNG)推进小型船舶的燃料供应系统进行优化而同时满足燃料供应稳定性和应用便利性以及空间密集性,还可以排除现有的缓冲罐,而且可以通过对用于液化天然气(LNG)气化以及压力控制的管路进行整合而减少尺寸,因此具有可以对燃料供应系统所占据的空间进行密集型应用的优点并达成降低制造成本的效果。
此外,需要提前明确的是,本发明的其他效果不仅包含在上述内容中说明的实施例以及本发明的权利要求书中记载的事项,还包含可以轻易地从中推导出的范围内的可达成的效果以及可为产业发展做出贡献的潜在优点。
附图说明
图1是适用本发明的小型船舶用空间密集型液化天然气(LNG)燃料供应系统的概要性构成图。
具体实施方式
接下来,将参阅附图对适用本发明的较佳实施例进行详细的说明。在说明之前需要明确的是,本发明的优点和特征及其达成方法,将可以通过结合附图在后续内容中进行详细说明的实施例得到进一步明确。此外,在本说明书中所使用的术语只是用于对实施例进行说明而不是为了对本发明做出限定,在如上所述的术语中,除非另有明确的提及,否则单数型语句还包含复数型含义,而且在说明中用于指示方向的术语只是为了帮助理解说明内容,可能会根据视角发生变更。
本发明的主要的技术思想在与提供一种可以通过针对液化天然气(LNG)推进小型船舶的燃料供应系统进行优化而同时满足燃料供应稳定性和应用便利性以及空间密集性,还可以排除现有的缓冲罐,而且可以通过对用于液化天然气(LNG)气化以及压力控制的管路进行整合而减少尺寸,因此具有可以对燃料供应系统所占据的空间进行密集型应用的小型船舶用空间密集型液化天然气(LNG)燃料供应系统。
接下来,将对用于达成如上所述的目的的适用本发明的较佳实施例进行详细的说明。
如图1所示,本发明包括第一游离气体管路100、加热器200、气体管路300、液体管路400、蒸发器500以及第二游离气体管路600。
第一游离气体管路100,是将在液化天然气(LNG)燃料罐上部蒸发空间中产生的蒸发气体(BOG,以下记载为气体燃料)导向供应到如4冲程双重燃料引擎或燃气引擎等燃料消耗场所的管路。此外,加热器200将从第一游离气体管路100供应过来的气体燃料加热至燃料消耗场所要求的适当温度,而气体管路300是将在加热器200中加热的气体燃料供应到燃料消耗场所的管路。
接下来,液体管路400是将存储在液化天然气(LNG)燃料罐下部的液化天然气(以下记载为液体燃料)导向供应到燃料消费场所的管路。此外,蒸发器500将从液体管路400供应过来的液体燃料气化成气体燃料,而第二游离气体管路600是将从蒸发器500供应过来的气体燃料汇流到第一游离气体管路100的管路。
具体来讲,第一游离气体管路100和加热器200以及气体管路300是用于从液化天然气(LNG)燃料罐的蒸发空间将气体燃料供应到引擎的管路,而液体管路400和蒸发器500以及第二游离气体管路600是通过与第一游离气体管路100连接而对液体燃料进行气化并供应到引擎的同时通过对蒸发空间以及气体燃料流动的管路的压力进行控制而执行缓冲器功能的管路。
约-160℃的液体燃料将借助于水头压力从液化天然气(LNG)燃料罐供应到液体管路400上,而液体燃料将在通过安装在液体管路400上并稳定地维持液化天然气(LNG)燃料罐的压力的压力控制阀(Pressure Control Valve)410之后以一定的压力以及流量供应到蒸发器(PBU Vaporizer)500。此外,液体燃料将通过蒸发器500得到气化并转换成约零下130℃~50℃的低温气体燃料之后供应到第二游离气体管路600,进而供应到液化天然气(LNG)燃料罐的蒸发空间以及气体管路300。
此时,在控制第一游离气体管路100以及第二游离气体管路600上的低温气体燃料维持相同的压力的同时使其维持相对大于气体管路300上的气体燃料的压力,并使得第一游离气体管路100以及第二游离气体管路600上的管道的截面积相对大于气体管路300上的管道的截面积,从而可以与蒸发空间一起起到缓冲器功能。
此外,通过第一游离气体管路100供应的低温的气体燃料将通过加热器200加热至适当的温度,从而满足燃料消耗场所要求的温度并供应到气体管路300。
此时,如上所述,控制蒸发空间、第一游离气体管路100以及第二游离气体管路600上的低温气体燃料维持相同的压力,并维持与气体管路300上的高温气体燃料的压力相比高约1bar~1.5bar左右的压力。
这可以通过将气体管路300上的压力传感器的设定值设定为与蒸发空间和第一游离气体管路100以及第二游离气体管路600上的压力相对较小的值,并在第一游离气体管路100上通过安装在加热器200方向的端部的减压阀110对所供应的气体燃料进行减压的构成实现。与此同时,在第一游离气体管路100上的减压阀110的前端安装止回阀,从而防止经过减压并通过加热器200的气体燃料发生逆流为宜。
此外,加热器200以及蒸发器500的热源是通过乙二醇供应管路700供应。如上所述的乙二醇供应管路700适用如引擎等燃料需求场所的中间热介质即乙二醇,中间热介质将在乙二醇供应管路700上的乙二醇液体加热器中通过水套冷却水(冷却水)得到加热。
此时,中间热介质的流量以及温度变化会根据燃料需求场所的负荷变化发生较大的偏差,尤其是考虑到在引擎的负荷较低的情况下难以维持中间热介质的适当温度的问题,可以通过在乙二醇供应管路700上的乙二醇液体加热器与蒸发器500之间安装电加热器710而维持中间热介质的适当温度。
上述内容中的说明内容只是对本发明的技术思想进行的示例性说明,具有本发明所属技术领域之一般知识的人员可以在不脱离本发明的本质特征的范围内对本发明进行各种修改、变更以及置换。此外,如上所述的在本发明中公开的实施例以及附图,只是用于对本发明的技术思想进行说明而非限定,本发明的技术思想的范围并不因为所述实施例以及附图而受到限定。本发明的保护范围应根据所附的权利要求书做出解释,而且与其同等范围内的所有技术思想应解释为包含于本发明的权利要求范围之内。
Claims (4)
1.一种小型船舶用空间密集型液化天然气燃料供应系统,其特征在于,包括:
第一游离气体管路,将液化天然气燃料罐上部蒸发空间中的气体燃料导向供应到燃料消费场所;
加热器,对从所述第一游离气体管路供应过来的气体燃料进行加热;
气体管路,将在所述加热器中加热的气体燃料供应到燃料消费场所;
液体管路,将液化天然气燃料罐下部的液体燃料导向供应到燃料消费场所;
蒸发器,将从所述液体管路供应过来的液体燃料气化成气体燃料;以及,
第二游离气体管路,将从所述蒸发器供应过来的气体燃料汇流到第一游离气体管路;
所述第一游离气体管路以及第二游离气体管路上的管道的截面积相对大于所述气体管路上的管道的截面积,
在所述液化天然气燃料罐、第一游离气体管路以及第二游离气体管路上维持相同的气体燃料压力的同时使其维持相对大于所述气体管路上的压力,
从而使得第一游离气体管路以及第二游离气体管路与所述液化天然气燃料罐的蒸发空间一起起到缓冲器功能。
2.根据权利要求1所述的小型船舶用空间密集型液化天然气燃料供应系统,其特征在于:
在所述液体管路上,
安装有用于稳定地维持所述燃料罐的压力的压力控制阀。
3.根据权利要求1所述的小型船舶用空间密集型液化天然气燃料供应系统,其特征在于:
在所述第一游离气体管路上,
安装有对供应到所述加热器中的气体燃料进行减压的减压阀,且在所述减压阀的前端,安装有防止经过减压并通过加热器的气体燃料发生逆流的止回阀。
4.根据权利要求1所述的小型船舶用空间密集型液化天然气燃料供应系统,其特征在于:
所述热交换机以及加热器的热源是通过乙二醇供应管路供应,所述热源是被燃料需求场所的水套冷却水加热的中间热介质,在所述乙二醇供应管路上安装有电加热器,从而使得中间热介质的维持在适当的温度。
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KR102141086B1 (ko) | 2020-08-05 |
WO2021096049A1 (ko) | 2021-05-20 |
CN113330244B (zh) | 2022-12-06 |
JP2022517667A (ja) | 2022-03-09 |
JP7162380B2 (ja) | 2022-10-28 |
KR102141086B9 (ko) | 2021-09-17 |
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