CN114061265A - 一种规模化焦炉气联合生产合成氨和lng的装置及方法 - Google Patents

一种规模化焦炉气联合生产合成氨和lng的装置及方法 Download PDF

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CN114061265A
CN114061265A CN202010772295.XA CN202010772295A CN114061265A CN 114061265 A CN114061265 A CN 114061265A CN 202010772295 A CN202010772295 A CN 202010772295A CN 114061265 A CN114061265 A CN 114061265A
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nitrogen
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章有虎
苟文广
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Hangzhou Zhongtai Cryogenic Technology Corp
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Abstract

本发明公开了一种规模化焦炉气联合生产合成氨和LNG的装置及方法,属于深冷分离设备领域。本发明的高压脱氢塔和低压脱氮塔的塔顶制冷方式都用洗涤工艺代替冷凝工艺,使整个工厂的系统能耗极大下降;而且低压脱氢塔塔顶尾气不出界区,增压后并入合成气,原料气回收率高。相对于现有技术而言,本发明的装置和工艺方法尤其适用于原料气为含氮量较高的焦炉气或兰炭尾气,此类进入深冷液化单元的原料气组分主要为氢气、氮气和甲烷,通过本工艺的分离液化处理,原料气中的氢气和氮气去做合成氨,甲烷分离后液化,作为产品LNG,装置没有副产物,完全利用。

Description

一种规模化焦炉气联合生产合成氨和LNG的装置及方法
技术领域
本发明属于深冷分离设备领域,具体涉及一种规模化焦炉气联合生产合成氨和LNG的装置及方法。
背景技术
目前国内LNG原料气来源主要分为管道天然气制LNG、焦炉气制LNG、煤制气制LNG等几种主要工艺路线。其中管道天然气液化工艺的经典流程是采用单混合冷剂流程(SMRC),制冷单元主要配置为一台混合冷剂压缩机和一台冷箱。焦炉气制LNG的常规流程为,一台混合冷剂压缩机为装置提供主要冷量,一台氮气循环压缩机,为分离原料气的高压精馏塔和低压精馏塔塔顶提供冷源。
煤制天然气的工艺路线和焦炉气基本一样,主要是看原料气中甲烷的含量以及产品用途,选择不同的液化工艺路线。
当焦炉煤气制LNG,其富氢尾气及富氮尾气是去做合成氨时,采用常规的焦炉气制LNG的双塔精馏流程不是最优方案。杭州中泰深冷技术股份有限公司专利技术的高压塔(02)是液氮洗吸收塔,采用液氮洗涤的方式,这样塔顶可以获得不含甲烷,氮氢比为1:3的合成气。低压脱氮塔(01)塔顶出冷箱后的富氮氢尾气,通过循环富氮气压缩机(07)增压后并入原料气,然后进入冷箱,并进入氮洗塔进行分离提纯。
常规双塔流程,塔顶采用间壁式换热器,制冷液氮不与原料气接触,因此存在冷热流体的温差损失以及换热器的热阻损失,其适用于焦炉气制甲醇等塔顶只需氢气的工艺路线。此工艺高压塔顶气体氢气纯度相对较高,氮气含量少,并且含有少量甲烷。如要求甲烷含量很低时,则需要塔顶的制冷温度很低,并且能耗很高。
在申请人已申请的申请号为201610955145.6的发明专利中,提出了一种焦炉气制LNG联产合成氨装置及控制方法,其中焦炉气制LNG联产合成氨工艺采用高压氮洗塔,塔顶采用冷热流体混合换热工艺,并且通过液氮的洗涤吸收,可以使高压塔顶气不含甲烷,塔顶含氮气量增加,正好为氢气配氮。因此此工艺非常适合LNG联产合成氨,通过液氮洗工艺使出高压洗涤塔的合成气氮气含量增加,并满足去合成氨的合成气氢氮比为3:1。而低压脱氮塔塔顶的氢氮尾气,采用循环氮氢压缩机,增压后并入进冷箱的原料气中,然后进入氮洗塔内分别回收氮氢气和甲烷。但是,在该技术方案中,虽然其在一定程度上相对于常规双塔流程降低了能耗,但是其低压脱氮塔塔顶的尾气依然需要循环氮氢压缩机增压,因此其依然存在能耗上的缺陷。
发明内容
本发明的目的在于解决焦炉气制LNG技术中存在的能耗较高、原料气回收率低的技术问题,并提供一种规模化焦炉气联合生产合成氨和LNG的装置及方法。
本发明所采用的具体技术方案如下:
一种规模化焦炉气联合生产合成氨和LNG的装置,其包括低压脱氮塔、高压氮洗塔、主换热器、富氮气尾气压缩机和冷剂制冷系统,其中低压脱氮塔、高压氮洗塔、主换热器均位于冷箱内,低压脱氮塔和高压氮洗塔均在塔顶部设有喷淋装置;所述冷剂制冷系统通过冷剂管路与冷箱内的主换热器相连,用于提供冷量;
空分氮气管路一端连接用于提供空分氮气的第一进口,另一端穿过主换热器后,分为两条支路,第一支路接入低压脱氮塔顶部的喷淋装置中,第二支路接入高压氮洗塔顶部的喷淋装置中;
焦炉气管路一端连接用于提供净化后焦炉气的第二进口,另一端穿过主换热器后,经过低压脱氮塔底部的再沸器,再重新穿过主换热器后接入高压氮洗塔下部;
冷凝液管路一端连接高压氮洗塔塔底,另一端接入低压脱氮塔中部;
第一塔顶气体管路一端连接高压氮洗塔的塔顶,另一端穿过主换热器后连接通往合成氨工序的第一出口;
第二塔顶气体管路一端连接低压脱氮塔的塔顶,另一端穿过主换热器后经过富氮气尾气压缩机,再并入第一出口前端的第一塔顶气体管路中;
所述的空分氮气管路在进入主换热器之前通过一条分支支路连接第一出口前端的第一塔顶气体管路;
LNG管路一端连接低压脱氮塔塔底,另一端穿过主换热器后连接通往LNG 储罐的第五出口。
作为优选,所述冷剂制冷系统包括第一混合冷剂管路、第二混合冷剂管路、气相冷剂分离器和液相冷剂分离器;
第一混合冷剂管路一端连接用于提供气相混合冷剂的第三进口,另一端依次穿过主换热器和气相冷剂分离器后,再次穿过主换热器后接入通往压缩机的第二出口;
第二混合冷剂管路一端连接用于提供液相混合冷剂的第四进口,另一端依次穿过主换热器和液相冷剂分离器后,再次穿过主换热器后接入通往压缩机的第二出口。
作为优选,所述的空分氮气管路在第一进口后端位置设有限流阀,在接入高压氮洗塔的前端位置设有第一调节阀,在接入低压脱氮塔的前端位置设有第二调节阀。
作为优选,所述的焦炉气管路在第二进口后端位置设有调节阀,在接入高压氮洗塔的前端位置设有第三调节阀。
作为优选,所述的冷凝液管路上设有第一压力调节阀。
作为优选,所述的第一塔顶气体管路穿出主换热器的后端位置设有压力控制系统。
作为优选,所述的低压脱氮塔中设有液位指示控制。
作为优选,所述的LNG管路在连接第五出口的前端位置设有液位控制阀。
作为优选,所述的第一混合冷剂管路在进入气相冷剂分离器的前端位置设有第四调节阀,所述的第二混合冷剂管路在进入液相冷剂分离器的前端位置设有流量控制系统。
本发明的另一目的在于提供一种利用上述任一方案所述装置的规模化焦炉气联合生产合成氨和LNG的方法,其方法如下:
S1:将空分氮气通过空分氮气管路送入主换热器中进行冷却液化,得到液氮;液氮分别通过空分氮气管路的两条支路进入高压脱氢塔与低压脱氮塔进行塔顶喷淋;
S2:将净化后的焦炉气通过焦炉气管路送入主换热器中进行第一次冷却液化,得到液态焦炉气;液态焦炉气进入低压脱氮塔的再沸器中分离出氮气,剩余组分再进入主换热器中进第二次冷却液化,得到液态氢气和液态甲烷混合物,然后将液态氢气和液态甲烷混合物送入高压脱氢塔,在液氮喷淋作用下将氢气和甲烷分离,冷凝物料沉积于塔底,氮气和氢气的混合气聚集于塔顶;
S3:高压脱氢塔塔底的冷凝物料通过冷凝液管路送入低压脱氮塔中部,在液氮喷淋作用下使甲烷液化,液态甲烷沉积于塔底,氮气和氢气的混合气聚集于塔顶;低压脱氮塔塔底分离得到的液态甲烷通过LNG管路送入主换热器冷却后,存储于LNG储罐中;
S4:高压脱氢塔塔顶的混合气通过第一塔顶气体管路送入主换热器复热得到第一合成气;低压脱氮塔塔顶的混合气通过第二塔顶气体管路送入主换热器复热后再经过富氮气尾气压缩机增压,得到第二合成气;
S5:将所述第一合成气和第二合成气合并后,利用空分氮气管路的分支支路输送的氮气调节至氮氢比例满足氨合成的物料比,最后送入合成氨工序。
相对于现有技术而言,本发明的装置和工艺方法尤其适用于原料气为含氮量较高的焦炉气或兰炭尾气,此类进入深冷液化单元的原料气组分主要为氢气、氮气和甲烷,通过本工艺的分离液化处理,原料气中的氢气和氮气去做合成氨,甲烷分离后液化,做为产品LNG,装置没有副产物,完全利用。另外,采用本发明工艺流程的优点如下:
1、低压脱氢塔塔顶尾气不出界区,增压后并入合成气,原料气回收率高。
2、高压脱氢塔和低压脱氮塔的塔顶制冷方式都用洗涤工艺代替冷凝工艺,使整个工厂的系统能耗极大下降。
附图说明
图1为实施例中规模化焦炉气联合生产合成氨和LNG的装置示意图。
图中附图标记为:低压脱氮塔1、高压氮洗塔2、主换热器3、冷箱4、气相冷剂分离器5、液相冷剂分离器6、富氮气尾气压缩机7、限流阀11、调节阀12、压力控制系统13、第一调节阀14、第二调节阀15、第一压力调节阀16、第三调节阀17、液位指示控制18、流量控制系统19、第四调节阀20、液位控制阀21、第一进口A、第二进口B、第一出口C、第二出口D、第三进口E、第四进口F、第五出口G。
具体实施方式
下面结合附图和具体实施方式对本发明做进一步阐述和说明。本发明中各个实施方式的技术特征在没有相互冲突的前提下,均可进行相应组合。
如图1所示,作为本发明的一个较佳实施例,提供了一种规模化焦炉气联合生产合成氨和LNG的装置,其主要部件包括低压脱氮塔1、高压氮洗塔2、主换热器3、富氮气尾气压缩机7和冷剂制冷系统。其中低压脱氮塔1、高压氮洗塔 2、主换热器3均位于冷箱4内,富氮气尾气压缩机7位于冷箱4外部。冷剂制冷系统通过冷剂管路与冷箱4内的主换热器3相连,用于提供冷量。
本发明的低压脱氮塔1和高压氮洗塔2均取消了传统工艺中的塔顶冷凝器,转而采用塔顶液氮喷淋的方式,将甲烷洗涤下来。因此,本发明的低压脱氮塔1 和高压氮洗塔2均在塔顶部设有喷淋装置。
第一进口A用于为本发明装置提供空分中压氮气,空分氮气管路一端连接第一进口A,另一端穿过主换热器3换热冷却后穿出主换热器3,穿出主换热器 3的空分氮气管路分为两条支路,第一支路接入低压脱氮塔1顶部的喷淋装置中,第二支路接入高压氮洗塔2顶部的喷淋装置中,通过喷淋装置的喷淋作用使液氮沿着塔体向下流动,对内部的焦炉气中的甲烷进行液化。
第二进口B用于为本发明装置提供净化后焦炉气,焦炉气管路一端连接第二进口B,另一端穿过主换热器3换热冷却后,经过低压脱氮塔1底部的再沸器,使液态焦炉气中的氮气汽化剩余甲烷和氢气组分,然后焦炉气管路再重新穿过主换热器3换热冷却后接入高压氮洗塔2下部,使液态甲烷和液态氢气进入高压氮洗塔2下部进行后续分离。
高压氮洗塔2塔底设有一条冷凝液管理,冷凝液管路一端连接高压氮洗塔2 塔底,另一端接入低压脱氮塔1中部,用于将高压氮洗塔2塔底冷凝的物料输入低压脱氮塔1中部,进行后续分离处理。
高压氮洗塔2的塔顶设有第一塔顶气体管路,第一塔顶气体管路一端连接高压氮洗塔2的塔顶,另一端穿过主换热器3复热后连接通往合成氨工序的第一出口C,用于将高压氮洗塔2塔顶富集的气体送入合成氨工序。
低压脱氮塔1的塔顶设有第二塔顶气体管路,第二塔顶气体管路一端连接低压脱氮塔1的塔顶,另一端穿过主换热器3复热后,接入富氮气尾气压缩机7 进行加压,第二塔顶气体管路从富氮气尾气压缩机7的出口连接第一塔顶气体管路,将经过富氮气尾气压缩机7加压后的低压脱氮塔1塔顶气并入第一出口C 前端的第一塔顶气体管路中,高压氮洗塔2和低压脱氮塔1中的塔顶气一并进入合成氨工序。
由于在合成氨工序中对于气体的氮氢比例有要求一般为N:H摩尔比3:1,但从高压氮洗塔2和低压脱氮塔1中直接排出的塔顶气不一定能够满足工艺要求,因此需要通入氮气进行比例调配。在本发明中,空分氮气管路在进入主换热器3 之前通过一条分支支路连接第一出口C前端的第一塔顶气体管路,能利用空分氮气管路中的空分中压氮气对第一出口C输出的混合气体进行氮氢比例调配,使其满足氮氢比例=3:1的要求。
另外,低压脱氮塔1塔底经过液氮淋洗,会富集液态甲烷即LNG,因此LNG 管路一端连接低压脱氮塔1塔底,另一端穿过主换热器3换热冷却后连接通往 LNG储罐的第五出口G,用于将低压脱氮塔1塔底的LNG送入LNG储罐进行存储。
上述装置中,冷剂制冷系统的作用是对冷箱4提供冷量,其可以采用任意的现有技术实现,不做限定。在本发明的优选实施例中,参见图1所示,提供了一种冷剂制冷系统的具体实现形式,具体如下:
该冷剂制冷系统包括第一混合冷剂管路、第二混合冷剂管路、气相冷剂分离器5和液相冷剂分离器6。气相混合冷剂从第三进口E输入,第一混合冷剂管路一端连接第三进口E,另一端依次穿过主换热器3和气相冷剂分离器5后,再次穿过主换热器3后接入通往压缩机的第二出口D。液相混合冷剂从第四进口F 输入,第二混合冷剂管路一端连接第四进口F,另一端依次穿过主换热器3和液相冷剂分离器6后,再次穿过主换热器3后接入通往压缩机的第二出口D,由压缩机进行压缩液化。
另外,在上述装置中,相应功能的实现需要配置必要的阀门控制组件,具体的配置可以根据相应功能的实现来调整,本发明对此不做限定。在本发明的优选实施例中,参见图1所示,其阀门控制组件的一种设置方式如下:
空分氮气管路在第一进口A后端位置设有限流阀11,空分氮气管路在接入高压氮洗塔2的前端位置设有第一调节阀14,空分氮气管路在接入低压脱氮塔1 的前端位置设有第二调节阀15。焦炉气管路在第二进口B后端位置设有调节阀 12,在接入高压氮洗塔2的前端位置设有第三调节阀17。冷凝液管路上设有第一压力调节阀16。第一塔顶气体管路穿出主换热器3的后端位置设有压力控制系统13。压力控制系统13由压力阀和压力指示控制组成,以调节管路中的气体压力大小。低压脱氮塔1中设有液位指示控制18。LNG管路在连接第五出口G 的前端位置设有液位控制阀21。第一混合冷剂管路在进入气相冷剂分离器5的前端位置设有第四调节阀20,第二混合冷剂管路在进入液相冷剂分离器6的前端位置设有流量控制系统19。流量控制系统19由流量阀和流量指示控制组成,以调节管路中的冷剂流量。上述各阀门中,第一调节阀14、第二调节阀15、第一压力调节阀16、第三调节阀17、液位指示控制18设置于冷箱4内,其余均设置于冷箱4外部,以便于调节。
基于上述图1所示的装置,本发明还提供了一种规模化焦炉气联合生产合成氨和LNG的方法,其具体方法如下:
S1:将空分氮气通过空分氮气管路送入主换热器3中进行冷却液化,得到液氮;液氮分别通过空分氮气管路的两条支路进入高压脱氢塔2与低压脱氮塔1 进行塔顶喷淋。
S2:将净化后的焦炉气组分主要为氢气、氮气和甲烷通过焦炉气管路送入主换热器3中进行第一次冷却液化,得到液态焦炉气;液态焦炉气进入低压脱氮塔 1的再沸器中分离出氮气,剩余组分再进入主换热器3中进第二次冷却液化,得到液态氢气和液态甲烷混合物,然后将液态氢气和液态甲烷混合物送入高压脱氢塔2,在液氮喷淋作用下将氢气和甲烷分离,冷凝物料沉积于塔底,氮气和氢气的混合气聚集于塔顶。本步骤中,塔底的冷凝物料含有氮气、少量氢气以及甲烷,塔顶气体主要为氮气和氢气,液氮的洗涤吸收可以使高压塔顶气不含甲烷,塔顶含氮气量增加,正好为氢气配氮。
S3:高压脱氢塔2塔底的冷凝物料通过冷凝液管路送入低压脱氮塔1中部使各组分汽化,然后在液氮喷淋作用下使甲烷液化,液态甲烷沉积于塔底,氮气和氢气的混合气聚集于塔顶。本步骤中,塔顶气体主要为氮气,含有少量氢气,而塔底则是纯的液态甲烷,低压脱氮塔1塔底分离得到的液态甲烷通过LNG管路送入主换热器3冷却后,存储于LNG储罐中。
S4:高压脱氢塔2塔顶的混合气通过第一塔顶气体管路送入主换热器3复热得到第一合成气;低压脱氮塔1塔顶的混合气通过第二塔顶气体管路送入主换热器3复热后再经过富氮气尾气压缩机7增压,得到第二合成气;
S5:将所述第一合成气和第二合成气合并后,利用空分氮气管路的分支支路输送的氮气调节至氮氢比例满足氨合成的物料比,最后送入合成氨工序。
为了展示本发明的装置及方法的效果,申请人罗列了常规工艺双塔精馏、在先申请双塔精馏工艺(CN201610955145.6)、以及本发明双塔精馏工艺的相关能耗、原料回收率等方面的参数,具体如下:
1、不同工艺流程液化工区能耗对比
单位产品能耗(轴功率kw/Nm<sup>3</sup>) 基况 高碳 低碳
常规工艺双塔精馏 0.463 0.443 0.493
在先申请双塔精馏工艺 0.447 0.441 0.46
本申请双塔精馏工艺 0.435 0.43 0.45
2、不同工艺流程回收率比较
甲烷回收率
常规工艺双塔精馏 98.5%
在先申请双塔精馏工艺 100%
本申请双塔精馏工艺 100%
3、不同工艺对合成氨工序影响
Figure BDA0002617096070000081
由此可见,本发明相对于在先申请双塔精馏工艺进一步降低了能耗,具有 100%的甲烷回收率。因此该工艺尤其适用于原料气为含氮量较高的焦炉气或兰炭尾气,进入深冷液化单元的原料气组分主要为氢气、氮气和甲烷,通过本工艺的分离液化处理,原料气中的氢气和氮气去做合成氨,甲烷分离后液化,做为产品LNG,装置没有副产物,完全利用。
以上所述的实施例只是本发明的一种较佳的方案,然其并非用以限制本发明。有关技术领域的普通技术人员,在不脱离本发明的精神和范围的情况下,还可以做出各种变化和变型。因此凡采取等同替换或等效变换的方式所获得的技术方案,均落在本发明的保护范围内。

Claims (10)

1.一种规模化焦炉气联合生产合成氨和LNG的装置,其特征在于,包括低压脱氮塔(1)、高压氮洗塔(2)、主换热器(3)、富氮气尾气压缩机(7)和冷剂制冷系统,其中低压脱氮塔(1)、高压氮洗塔(2)、主换热器(3)均位于冷箱(4)内,低压脱氮塔(1)和高压氮洗塔(2)均在塔顶部设有喷淋装置;所述冷剂制冷系统通过冷剂管路与冷箱(4)内的主换热器(3)相连,用于提供冷量;
空分氮气管路一端连接用于提供空分氮气的第一进口(A),另一端穿过主换热器(3)后,分为两条支路,第一支路接入低压脱氮塔(1)顶部的喷淋装置中,第二支路接入高压氮洗塔(2)顶部的喷淋装置中;
焦炉气管路一端连接用于提供净化后焦炉气的第二进口(B),另一端穿过主换热器(3)后,经过低压脱氮塔(1)底部的再沸器,再重新穿过主换热器(3)后接入高压氮洗塔(2)下部;
冷凝液管路一端连接高压氮洗塔(2)塔底,另一端接入低压脱氮塔(1)中部;
第一塔顶气体管路一端连接高压氮洗塔(2)的塔顶,另一端穿过主换热器(3)后连接通往合成氨工序的第一出口(C);
第二塔顶气体管路一端连接低压脱氮塔(1)的塔顶,另一端穿过主换热器(3)后经过富氮气尾气压缩机(7),再并入第一出口(C)前端的第一塔顶气体管路中;
所述的空分氮气管路在进入主换热器(3)之前通过一条分支支路连接第一出口(C)前端的第一塔顶气体管路;
LNG管路一端连接低压脱氮塔(1)塔底,另一端穿过主换热器(3)后连接通往LNG储罐的第五出口(G)。
2.如权利要求1所述的规模化焦炉气联合生产合成氨和LNG的装置,其特征在于,所述冷剂制冷系统包括第一混合冷剂管路、第二混合冷剂管路、气相冷剂分离器(5)和液相冷剂分离器(6);
第一混合冷剂管路一端连接用于提供气相混合冷剂的第三进口(E),另一端依次穿过主换热器(3)和气相冷剂分离器(5)后,再次穿过主换热器(3)后接入通往压缩机的第二出口(D);
第二混合冷剂管路一端连接用于提供液相混合冷剂的第四进口(F),另一端依次穿过主换热器(3)和液相冷剂分离器(6)后,再次穿过主换热器(3)后接入通往压缩机的第二出口(D)。
3.如权利要求1所述的规模化焦炉气联合生产合成氨和LNG的装置,其特征在于,所述的空分氮气管路在第一进口(A)后端位置设有限流阀(11),在接入高压氮洗塔(2)的前端位置设有第一调节阀(14),在接入低压脱氮塔(1)的前端位置设有第二调节阀(15)。
4.如权利要求1所述的规模化焦炉气联合生产合成氨和LNG的装置,其特征在于,所述的焦炉气管路在第二进口(B)后端位置设有调节阀(12),在接入高压氮洗塔(2)的前端位置设有第三调节阀(17)。
5.如权利要求1所述的规模化焦炉气联合生产合成氨和LNG的装置,其特征在于,所述的冷凝液管路上设有第一压力调节阀(16)。
6.如权利要求1所述的规模化焦炉气联合生产合成氨和LNG的装置,其特征在于,所述的第一塔顶气体管路穿出主换热器(3)的后端位置设有压力控制系统(13)。
7.如权利要求1所述的规模化焦炉气联合生产合成氨和LNG的装置,其特征在于,所述的低压脱氮塔(1)中设有液位指示控制(18)。
8.如权利要求2所述的规模化焦炉气联合生产合成氨和LNG的装置,其特征在于,所述的LNG管路在连接第五出口(G)的前端位置设有液位控制阀(21)。
9.如权利要求2所述的规模化焦炉气联合生产合成氨和LNG的装置,其特征在于,所述的第一混合冷剂管路在进入气相冷剂分离器(5)的前端位置设有第四调节阀(20),所述的第二混合冷剂管路在进入液相冷剂分离器(6)的前端位置设有流量控制系统(19)。
10.一种利用如权利要求1~9任一所述装置的规模化焦炉气联合生产合成氨和LNG的方法,其特征在于,方法如下:
S1:将空分氮气通过空分氮气管路送入主换热器(3)中进行冷却液化,得到液氮;液氮分别通过空分氮气管路的两条支路进入高压脱氢塔(2)与低压脱氮塔(1)进行塔顶喷淋;
S2:将净化后的焦炉气通过焦炉气管路送入主换热器(3)中进行第一次冷却液化,得到液态焦炉气;液态焦炉气进入低压脱氮塔(1)的再沸器中分离出氮气,剩余组分再进入主换热器(3)中进第二次冷却液化,得到液态氢气和液态甲烷混合物,然后将液态氢气和液态甲烷混合物送入高压脱氢塔(2),在液氮喷淋作用下将氢气和甲烷分离,冷凝物料沉积于塔底,氮气和氢气的混合气聚集于塔顶;
S3:高压脱氢塔(2)塔底的冷凝物料通过冷凝液管路送入低压脱氮塔(1)中部使各组分汽化,在液氮喷淋作用下使甲烷液化,液态甲烷沉积于塔底,氮气和氢气的混合气聚集于塔顶;低压脱氮塔(1)塔底分离得到的液态甲烷通过LNG管路送入主换热器(3)冷却后,存储于LNG储罐中;
S4:高压脱氢塔(2)塔顶的混合气通过第一塔顶气体管路送入主换热器(3)复热得到第一合成气;低压脱氮塔(1)塔顶的混合气通过第二塔顶气体管路送入主换热器(3)复热后再经过富氮气尾气压缩机(7)增压,得到第二合成气;
S5:将所述第一合成气和第二合成气合并后,利用空分氮气管路的分支支路输送的氮气调节至氮氢比例满足氨合成的物料比,最后送入合成氨工序。
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