CN105452751A - 蒸发气体临时存储系统 - Google Patents

蒸发气体临时存储系统 Download PDF

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CN105452751A
CN105452751A CN201480025788.XA CN201480025788A CN105452751A CN 105452751 A CN105452751 A CN 105452751A CN 201480025788 A CN201480025788 A CN 201480025788A CN 105452751 A CN105452751 A CN 105452751A
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CN105452751B (zh
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张大俊
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Korea Advanced Institute of Science and Technology KAIST
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Abstract

提供了一种蒸发气体临时存储系统，更具体的说，提供了一种以用于在将液化天然气供给至填充有气体的船舶之前去除蒸发气体以使处于相对高压状态的填充有气体的船舶的燃料液化天然气罐减压的方法在高压下压缩蒸发气体、临时地将压缩的蒸发气体存储在蒸发气体吸收罐中、将存储的蒸发气体供给至高压气体输送部件和高压液化天然气输送部件以再循环蒸发气体、控制填充有气体的船舶的低压液化天然气液舱和燃料液化天然气罐的压力、去除复杂且昂贵的再液化装置的必要性的蒸发气体临时存储系统。

Description

蒸发气体临时存储系统
技术领域
本发明涉及一种蒸发气体临时存储系统，更具体地说，涉及一种以用于在将液化天然气供给至填充有气体的船舶之前去除蒸发气体以使处于相对高压状态的填充有气体的船舶的燃料液化天然气罐减压的方法在高压下压缩蒸发气体、临时地将压缩的蒸发气体存储在蒸发气体吸收罐中、将存储的蒸发气体供给至高压气体输送部件和高压液化天然气输送部件的蒸发气体临时存储系统。
背景技术
因为由于油价高造成利润低导致的具有较大困难的航运商业更倾向更经济、更环保的船舶。
特别地，随着用于防止全球变暖的绿色能源的使用趋势，用于获得船舶的推进力的能源倾向于取代具有液化天然气的柴油，并且对在船舶上使用液化天然气作为能源的研究已经积极地进行。
需要一种在将低温液化天然气供给至使用液化天然气作为能源的船舶之前使处于相对高压状态的填充有气体的船舶的燃料液化天然气罐减压的工艺。
上述减压工艺是通过用于去除填充有气体的船舶的燃料液化天然气罐的蒸发气体的方法进行。通常，用于再液化或燃烧蒸发气体的方法已被用于去除当液化天然气液舱(cargotank)填充有液化天然气时产生的蒸发气体。
图1是示意性地说明用于再液化蒸发气体以去除蒸发气体的现有系统的示图。
如图1所说明的，用于再液化蒸发气体以去除蒸发气体的系统通过压缩机压缩从填充有气体的船舶的低压液化天然气液舱和燃料液化天然气罐产生的低压蒸发气体，将低压蒸发气体转化成高压蒸发气体，将高压蒸发气体供给至高压气体输送部件或利用再液化系统再液化高压蒸发气体并将再液化的气体再次供给至低压液化天然气液舱。
然而，如上所述的用于去除蒸发气体的再液化系统是昂贵的且需要用于处理蒸发气体的复杂工艺和大量的时间来处理蒸发气体。
此外，通过燃烧用于去除蒸发气体的方法可能无法避免蒸发气体的损失并造成因燃烧导致的温室气体的产生。因此，需要对问题的解决方案。
发明内容
【技术问题】
本发明的目的是提供一种蒸发气体临时存储系统，其能通过去除填充有气体的船舶的低压液化天然气液舱和燃料液化天然气罐的蒸发气体控制填充有气体的船舶的低压液化天然气液舱和燃料液化天然气罐的压力。
本发明的另一个目的是提供一种蒸发气体临时存储系统，其能通过将蒸发气体临时地存储在蒸发气体吸收罐中、然后将蒸发气体供给至高压气体传输部件和高压液化天然气传输部件来回收通过燃烧等废弃的蒸发气体。
本发明的另一个目的是提供一种蒸发气体临时存储系统，其不需要用于再液化蒸发气体以处理蒸发气体的复杂的且昂贵的再液化系统。
【技术方案】
在一个普通方面中，一种蒸发气体临时存储系统，其包括：燃料罐压力控制阀，控制填充有气体并使用液化天然气作为燃料的船舶的燃料液化天然气罐的压力，以排放低压蒸发气体；液舱压力控制阀，控制存储或供给低压液化天然气的低压液化天然气液舱的压力，以排放低压蒸发气体；压缩机：压缩从燃料罐压力控制阀和液舱压力控制阀排放的低压蒸发气体，以被转化成高压蒸发气体，所述蒸发气体临时存储系统包括：蒸发气体吸收罐，其在处于汽-液(vapor-liquid)彼此分离吸收由压缩机产生的高压蒸发气体并存储高压蒸发气体和液化天然气；吸收罐压力控制阀，其控制蒸发气体吸收罐的压力，以将高压蒸发气体供给至高压气体输送部件；第一液化天然气泵，其将从蒸发气体吸收罐40排放的液化天然气的一部分再引入和再循环至蒸发气体吸收罐中。
蒸发气体临时存储系统可进一步包括：液化天然气注射部，其将再引入的液化天然气注射至蒸发气体吸收罐中并形成在蒸发气体吸收罐的上部处。
第一液化天然气泵可将蒸发气体吸收罐的液化天然气供给至高压液化天然气输送部件。
蒸发气体临时存储系统可进一步包括：第三液化天然气泵，其将低压液化天然气液舱的液化天然气的一部分引入并再循环至蒸发气体吸收罐中。
蒸发气体临时存储系统可进一步包括：压缩机旁路通道，其绕过从填充有气体的船舶的燃料液化天然气罐产生的蒸发气体以防止蒸发气体通过压缩机。
【有利效果】
根据本发明的示例性实施例，蒸发气体临时存储系统可去除填充有气体的船舶的低压液化天然气液舱和燃料液化天然气罐的蒸发气体，以控制填充有气体的船舶的低压液化天然气液舱和燃料液化天然气罐的压力。
特别地，根据本发明的示例性实施例，蒸发气体临时存储系统可通过将蒸发气体临时地存储在蒸发气体吸收罐中、然后将蒸发气体供给至高压气体传输部件和高压液化天然气传输部件来回收通过燃烧等废弃的蒸发气体。
此外，根据本发明的示例性实施例，蒸发气体临时存储系统不需要压力装置，其用于通过将蒸发气体存储在处于高压的蒸发气体吸收罐中、然后将蒸发气体供给至高压气体传输部件和高压液化天然气传输部件而增加用作燃料的燃料的压力。
此外，根据本发明的示例性实施例，蒸发气体临时存储系统可能不需要用于再液化蒸发气体的复杂且昂贵的再液化系统。
此外，根据本发明的示例性实施例的蒸发气体临时存储系统将蒸发气体吸入液化天然气中并存储它，使得蒸发气体存储罐的体积可比气体存储方法减小得更多。
附图说明
图1是示意性地说明根据现有技术的蒸发气体再液化系统的示图。
图2是示意性地说明根据本发明的示例性实施例的蒸发气体临时存储系统的示图。
图3是示意性地说明根据本发明的示例性实施例的用于促进蒸发气体吸收至蒸发气体临时存储系统的吸收促进装置的示图。
图4是示意性地说明根据本发明的示例性实施例的用于促进蒸发气体吸收至蒸发气体临时存储系统的另一个吸收促进装置的示图。
具体实施方式
以下，将参照附图将更加详细地描述根据本发明的示例性实施例的具有上述特征的蒸发气体临时存储系统。
本说明书和权利要求中所使用的术语和词语不应被理解为一般含义或字典含义，而是应被理解为基于本发明人可适当地限定术语的概念以最佳方式描述其发明的原理满足本发明的技术构思的含义和概念。
因此，本说明书的示例性实施例和附图中描述的配置不代表本公开的所有技术精神，但仅仅是最优选的实施例。因此，本公开应被理解为包括在提交这个申请时包含在本公开的精神和范围中的所有变化、等价物和替代。
图1是示意性地说明根据现有技术的蒸发气体再液化系统的示图，图2是示意性地说明根据本发明的示例性实施例的蒸发气体临时存储系统的示图，图3是示意性地说明根据本发明的示例性实施例的用于促进蒸发气体吸收至蒸发气体临时存储系统的吸收促进装置的示图，图4是示意性地说明根据本发明的示例性实施例的用于促进蒸发气体吸收至蒸发气体临时存储系统的另一个吸收促进装置的示图。
填充有气体的船舶的燃料液化天然气罐10在填充有来自低压液化天然气液舱20的气体之前需要减压。减压工艺是通过用于从填充有气体的船舶的燃料液化天然气罐10去除蒸发气体的方法进行。
如图2至4中说明的，为了去除从填充有气体的船舶的燃料液化天然气罐10产生的蒸发气体，蒸发气体通过控制填充有气体的船舶的燃料液化天然气罐10的压力的燃料罐压力控制阀11被排放至蒸发气体吸收罐40并被吸收至蒸发气体吸收罐40用于存储。
将液化天然气填充在填充有气体的船舶中的低压液化天然气液舱20的蒸发气体也通过控制低压液化天然气液舱20的压力的液舱压力控制阀21吸收到蒸发气体吸收罐40中。
由于蒸发气体吸收罐40的压力随着蒸发气体吸收罐40吸收蒸发气体而上升，为了将蒸发气体连续地吸收至蒸发气体吸收罐40，低压蒸发气体需要被变化为高压蒸发气体。
如图2至4中说明的，压缩机30被安装以将低压蒸发气体变为然后被吸入蒸发气体吸收罐40中的高压蒸发气体。
然而，与低压蒸发气体由通过压缩机30变化为高压蒸发气体的情况不同，当填充有气体的船舶的燃料液化天然气罐10的蒸发气体的压力足够高时，蒸发气体不通过压缩机30，而是绕过存储在蒸发气体吸收罐40中的压缩机30。
通过本方法，蒸发气体吸收罐40连续地吸收高压蒸发气体以存储，当蒸发气体吸收罐40再也不能吸收高压蒸发气体时，蒸发气体需要被排放。
换言之，当蒸发气体吸收罐40的压力由于高压蒸发气体的连续吸收过度上升时，高压蒸发气体被供给至高压液化天然气输送部件50以降低蒸发气体吸收罐40的温度和压力。
此外，通过控制蒸发气体吸收罐40的压力排放高压蒸发气体的吸收罐压力控制阀41被形成以将高压蒸发气体供给至高压气体输送部件50。
如上所述的蒸发气体临时存储系统可控制填充有气体的船舶的燃料液化天然气罐10和低压液化天然气液舱20的压力.
此外，排放的蒸发气体被供给至高压气体输送部件50以回收，其防止废弃的蒸发气体迷失并对环境具有积极影响。
如图3或4中说明的，为了促进蒸发气体的吸收，根据本发明的示例性实施例的蒸发气体临时存储系统设有第一液化天然气泵42，其将从蒸发气体吸收罐40排放的液化天然气的一部分再引入至蒸发气体吸收罐40中以再循环。
通过第一液化天然气泵42再循环的液化天然气通过形成在蒸发气体吸收罐40中的液化天然气注射部43被再引入至蒸发气体吸收罐40中，从而促进蒸发气体的吸收。
换言之，蒸发气体吸收罐40存储通过利用压缩机30压缩蒸发气体或通过将填充有气体的船舶的燃料液化天然气罐10的蒸发气体吸收至在处于与高压蒸发气体分离的汽-液(vapor-liquid)时在蒸发气体吸收罐40中产生的高压液化天然气。
此外，如图4中所说明的，低压液化天然气罐20包括用来将存储的液化天然气供给至填充有气体的船舶的燃料液化天然气罐10的第二液化天然气泵22以及将存储的液化天然气再循环至蒸发气体吸收罐40以促进蒸发气体的吸收的第三液化天然气泵23。
换言之，蒸发气体临时存储系统将相对高压蒸发气体引入至以处于相对低压液化天然气存储在蒸发气体吸收罐40中的状态的蒸发气体吸收罐40中，其中引入的蒸发气体通过被吸收至存储在蒸发气体吸收罐40中的液化天然气中达到气-液平衡状态。
在这种情况下，通过第一液化天然气泵42或第三液化天然气泵23引入至蒸发气体吸收罐40中的液化天然气促进蒸发气体的吸收，因此在快速时间内达到汽-液平衡状态。
此外，蒸发气体临时存储系统将蒸发气体吸收至液化天然气中并将其存储在蒸发气体吸收罐40中，使得蒸发气体吸收罐40的体积与气体存储方法相比可减小得更多。
如图3或4中说明的，第一液化天然气泵42可再循环液化天然气以促进蒸发气体的吸收并甚至将高压液化天然气供给至高压液化天然气输送部件60。
换言之，根据本发明的示例性实施例的蒸发气体临时存储系统可在处理蒸发气体的工艺中将高压蒸发气体供给至高压气体输送部件50并甚至将高压液化天然气供给至高压液化天然气输送部件60。
根据本发明的示例性实施例的蒸发气体临时存储系统将高压蒸发气体和高压液化天然气供给至高压气体输送部件50和高压液化天然气输送部件60，从而回收通过燃烧等废弃的蒸发气体和液化天然气。
此外，根据本发明的示例性实施例的蒸发气体临时存储系统将高压蒸发气体和高压液化天然气供给至高压气体输送部件50和高压液化天然气输送部件60，从而去除了安装增加压力以将高压蒸发气体和高压液化天然气作为燃料的压力装置的必要性。
此外，根据本发明的示例性实施例的蒸发气体临时存储系统不需要用于再液化蒸发气体的再液化装置70，执行用于减少复杂的工艺和处理蒸发气体以增加填充有气体的船舶的燃料液化天然气罐10的减压工艺的效率所需的时间的蒸发气体去除过程并去除安装昂贵的再液化装置70的必要性，从而降低了减压工艺的总体成本。
[主要元件的详细描述]
10：填充有气体的船舶的液化天然气罐
11：燃料罐压力控制阀
20：低压液化天然气液舱
21：液舱压力控制阀
22：第二液化天然气泵
23：第三液化天然气泵
30：压缩机
31：压缩机旁路通道
40：蒸发气体吸收罐
41：吸收罐压力控制阀
42：第一液化天然气泵
43：液化天然气注射部
50：高压气体输送部件
60：高压液化天然气输送部件
70：再液化装置
71：再液化排放阀

Claims (5)

1.一种蒸发气体临时存储系统，其包括：燃料罐压力控制阀11，其控制填充有气体的船舶的燃料液化天然气罐10的压力以排放低压蒸发气体；液舱压力控制阀21，其控制存储或供给低压液化天然气的低压液化天然气液舱20的压力以排放低压蒸发气体；压缩机30，其压缩从所述燃料罐压力控制阀11和所述液舱压力控制阀21排放的低压蒸发气体以被转化成高压蒸发气体，所述蒸发气体临时存储系统包括：
蒸发气体吸收罐40，其在处于汽-液彼此分离时吸收由所述压缩机30产生的高压蒸发气体并存储高压蒸发气体和液化天然气；
吸收罐压力控制阀41，其控制所述蒸发气体吸收罐40的压力以将高压蒸发气体供给至高压气体输送部件50；
第一液化天然气泵42，其将从所述蒸发气体吸收罐40排放的液化天然气的一部分再引入并再循环至所述蒸发气体吸收罐40中。
2.根据权利要求1所述的蒸发气体临时存储系统，其进一步包括：
液化天然气注射部43，其将再引入的液化天然气注射至所述蒸发气体吸收罐40中且形成在所述蒸发气体吸收罐40的上部。
3.根据权利要求1所述的蒸发气体临时存储系统，其中所述第一液化天然气泵42将所述蒸发气体吸收罐40的液化天然气供给至高压液化天然气输送部件60。
4.根据权利要求1所述的蒸发气体临时存储系统，其进一步包括：
第三液化天然气泵23，其将所述低压液化天然气液舱20的液化天然气的一部分引入并再循环至所述蒸发气体吸收罐40中。
5.根据权利要求1所述的蒸发气体临时存储系统，其进一步包括：
压缩机旁路通道31，其绕过从填充有气体的船舶的所述燃料液化天然气罐10产生的蒸发气体以防止蒸发气体通过所述压缩机30。
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