CN1727830A - 富含碳氢化合物流的液化方法 - Google Patents
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Abstract
本发明涉及一种借助开式膨胀过程液化富含碳氢化合物流、特别是天然气流的方法,其中,液化和过冷富含碳氢化合物气体所需的最大冷量的提供是这样实现的,即将待液化的富含碳氢化合物气流在一个或多个换热器中、优选在板式换热器中与已液化和过冷的富含碳氢化合物流的一个减压后的分流相逆流地被液化及过冷。按照本发明,液化和过冷富含碳氢化合物流所需的最大冷量是通过至少部分已液化和过冷的富含碳氢化合物流的至少二股分流的减压来产生的,其中这些分流在不同压力时被蒸发。
Description
技术领域
本发明涉及一种借助开式膨胀过程来液化富含碳氢化合物流、特别是天然气流的方法,其中,液化和过冷此富含碳氢化合物流所需的最大冷量是这样实现的,即在一个或多个换热器、特别是板式换热器中,将待液化的富含碳氢化合物流逆着已液化和过冷的富含碳氢化合物流的一个减压后的分流地被液化和过冷。
背景技术
该概念“开式膨胀过程”是一种液化方法,在该液化方法中待液化的富含碳氢化合物流的一个分流在实际的液化前被分流出来、冷却、制冷地减压,然后逆着富含碳氢化合物流的待被液化的分流地被加热和蒸发。该蒸发后的分流不再与待被液化的富含碳氢化合物流相混合,而是通常供入一个所谓的低压网中去。
因为只有备有相应的低压网才能按此法液化富含碳氢化合物流,所以一般此法很少能实现。
下面借助于图1所示的实施例,详细阐述此类按现有技术液化富含碳氢化合物流的方法。
源自天然气网中的一股天然气流通过管道1输入一个一级或多级压缩机C1,并在该压缩机中被压缩到10-50巴压力。如果该天然气流已经具有足够高的压力,则可以放弃此压缩过程。然后压缩后的天然气流在一个最好吸附地工作的分离单元T中脱除水分。此股经压缩并脱除不需要组分后的天然气流接着通过管道2从分离单元T引出后分成二股分流。
第一股分流经管道3输入换热器E,并在该换热器中逆着待被加热的过程流地被冷却,在冷到适当温度时通过管道4离开换热器E,在后面还将对这些过程流进行说明。在一个膨胀透平X中完成制冷减压,压力降到2-10巴。现在,减压后的天然气流通过管道5被导送穿过换热器E,并在这种情况下逆着管道3和7中待冷却的天然气分流地被蒸发。它还提供了用于冷却待液化的第二股天然气分流所需的冷量,该第二天然气分流是经管道7输入换热器E的。该换热器E当然可以是多个并联和/或串联起来的换热器,为便于观看,图1中有半数没有示出。
已经提到过的待被液化的天然气分流在分离单元T’中脱除二氧化碳,该分离单元只在图1中示出。理论上两个分离单元T和T’的功能可以在一个唯一的分离单元中实现,那样则需将它设置在天然气流分流为所述分流前。
在换热器E中已被冷却的天然气分流通过管道8输入一个分离器D。由分离器的池槽通过管道9取出的液态的富含C2+的碳氢化合物馏分在减压阀a中减压,通过管道10同样被导送穿过换热器E。在此,该液态的馏分被待被冷却的过程流加热及在必要时蒸发。
通过管道5和10导送穿过换热器E的、并在此被加热到环境温度的这些馏分将通过管道6输入下一个用途,如供入一个低压网。
从分离器D的头通过管道11取出气态的富含甲烷的馏分将在换热器E中被液化和过冷,然后通过管道12离开换热器E。该最后被提到的馏分的液化和过冷所需的最大冷量是这样被提供的,即待被液化的天然气流的一个分流在减压阀c上减压,然后经过管道14在相对待被液化和过冷的天然气流的逆流中被导送通过板式换热器E。在此情况下,该通过管道14输入换热器E的天然气流在换热器E的所谓冷端在低压上蒸发。
该被加热了的天然气流流过换热器E以后,例如可通过管道15输入一个一级或多级再压缩机或者说二次压缩机C2,在该压缩机中将压缩至前述低压网的压力,并通过管道16离开二次压缩机C2,替代地,该天然气流也可以通过文杜里喷嘴实现所需的增压。
已液化和过冷的天然气流的那一股分流在减压阀b上被节流、及经管道13供入图中未示出的存储箱中去,该天然气流不是提供前述的最大冷量所需的。
图1示出的方法目前存在问题,即所使用的换热器E或者说它的结构性能上有局限。鉴于各通道间的最大允许温差,原则上板式换热器是有限制的。虽然在多数应用场合下,板式换热器比其它结构的换热器优越,比如明显地比卷式换热器(gewickelter Wrmetauscher)具有价格优势。
此外,所述的方法还有其它缺点,即那股用于提供最大冷量而分流出的液化天然气流必须进行再压缩或二次压缩,这就产生了不可忽视的能耗。
发明内容
本发明的任务在于,提供一种开头所述类型的液化富含碳氢化合物流、尤其是天然气流的方法,它克服了上述缺陷。
为解决此任务,提出一种液化富含碳氢化合物流的方法,此方法的特征是富含碳氢化合物流液化并过冷所需的最大冷量是由至少部分地液化后的富含碳氢化合物流的至少两个分流的减压来产生的,其中这些分流在不同的压力时被蒸发。
附图说明
下面借助于图2到4所显示的实施例详细说明按本发明的方法以及其它的方案,这些方案是从属权利要求的主题。
具体实施方式
在图2中示出的本发明方法的实施形式中,通过管道12从换热器E出来的液化和过冷后的天然气流共被分成三股分流。这些分流中的二股通过管道14和14’在减压阀c和c’中事先减压后再输入换热器E,并在与待液化和过冷的天然气流的逆流中被加热和蒸发。按照本发明,这些天然气分流在换热器E中在不同的压力水平上蒸发。
理论上也可是三股或更多股天然气分流与待被液化和过冷的天然气流相逆流地被加热和蒸发。但这种方案只在设计为大液化负荷或者说大液化能力的过程才有意义。
用上述方案可以解决上面提到的板式换热器内的这些通道之间的最大允许温差问题。因此换热器E就可以选用比其它换热器在结构上更简易更便宜的方案。
如图2所示,在管道14和14’中的减压后的天然气分流再次汇合,并被输入二次压缩机C2。但为此作为补充或替代的是这些减压后的天然气分流的一支可以输进管道10中富含C2+的碳氢化合物馏分中去和/或输进管道5中已被减压和被加热的天然气分流中去,在图上以虚线标出的管道17和18示出。这种替代方案的优点是可以减少输入二次压缩机C2的气流量,使二次压缩机C2的能耗相应降低。
在此还可在管道或管道段14’、17和/或18中设置一些稳压阀d、d’和d”。
在管道14和14’中二股天然气分流的量比例如何选择或者说调节,在个别情况下依赖于诸多参数及边界条件。
按本发明的方法液化富含碳氢化合物流的另一方案在图3中示出。
在按本发明方法的这一方案中,在换热器E中待被液化并过冷的天然气流经过管道11输入换热器E后,在适宜温度时离开换热器E。在它被重新输回换热器E之前,该液化了的天然气流的一股分流通过管道19被分离。在经过这些管道或管道段20和10输入尾气管道6之前,在此,可设置一个稳压阀e,这一股已液化了的天然气分流在减压阀d上节流,然后在换热器E中逆着待被液化的天然气流地被加热和蒸发。
作为补充和替代,在图3示出的方法中减压后的天然气分流的一股可被输进管道10中富含C2+的碳氢化合物溜分中去和/或输入管道5中已被减压和加热了的天然气分流中去。图中它们被用虚线标示的一些管道21和22示出,此外,在这些管道中还可设置有稳压阀e’和e”。
在图4中示出的按本发明的方法液化富含碳氢化合物流的方案中,在一个第二分离器D’中,已冷却的并至少是部分液化了的天然气流通过管道23输入此分离器,实现富含氮的气态馏分的分离。该馏分通过管道25从分离器D’的头被取出。
通过管道24从分离器D’的池槽取出一股富含甲烷的液态馏分,并再输回换热器E以用于过冷的目的。
所述由管道25从分离器D’的头取出的富含氮的气态馏分,通过管道27与从第一分离器D取出的富含C2+的碳氢化合物馏分混合,在该管道27中可设置一个稳压阀f。
如果希望或必须,管道25中富含氮的气态馏分可以通过管道26与通过管道24离开分离器D’的富含甲烷的液态馏分的分流混合,在该管道26中设置了一个稳压阀f。
图4中示出的按本发明的方法液化富含碳氢化合物流的方案中,还能够类似于图2和图3示出的方法那样实现将富含氮的气态馏分与其它适宜的过程流进行补充混合或替代混合。
作为图4所示方法的一种替代,甚至于可以将从分离器D’出来的液态馏分制冷地减压,以及将从分离器D’出来的气态馏分冷凝、过冷,并通过管道12被继续使用。
按本发明液化富含碳氢化合物流、特别是天然气流的方法与现有技术的方法相比具有很大优点,即它可以采用传统的板式换热器。由此,本方案与必须采用其它复杂结构的换热器的方案相比,可实现成本合适的液化方法和液化设备。
Claims (4)
1.一种借助开式膨胀过程来液化富含碳氢化合物流、特别是天然气流的方法,其中,液化和过冷富含碳氢化合物流所需的最大冷量的提供是这样实现的,即将待液化的富含碳氢化合物流在一个或多个换热器中、最好在板式换热器中,与已液化和过冷的富含碳氢化合物流的一个减压后的分流相逆流地液化和过冷。其特征在于,液化和过冷富含碳氢化合物的流(7)所需的最大冷量通过至少已部分液化了的富含碳氢化合物流(12)的至少二股分流(14,14’,18,27)的减压来产生,其中这些分流(14,14’,18,27)在不同的压力时蒸发(E)。
2.按权利要求1的方法,其特征在于,减压后的这些分流(14,14’,18,27)中,只有一股在蒸发(E)后被压缩(C2)。
3.按权利要求1或2的方法,其特征在于,至少已部分液化了的富含碳氢化合物流(12)的这些分流(14,14’,18,27)在不同温度水平上与富含碳氢化合物流分离。
4.按权利要求1至3之一的方法,其特征在于,至少已部分液化了的富含碳氢化合物流(11,12)的这些分流(14,14’,18,27)在不同压力水平和/或温度水平上与富含碳氢化合物的流分离。
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ITTO20150046U1 (it) * | 2015-04-10 | 2016-10-10 | Guido Maisto | Dispositivo per la rilevazione di deformazioni e la trasmissione dei dati rilevati |
EP3403038A1 (en) * | 2016-01-12 | 2018-11-21 | Global LNG Services AS | Method and plant for liquefaction of pre-processed natural gas |
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