CN110762383A - 用管束式高压气瓶组回收储存利用液货舱蒸发气的*** - Google Patents
用管束式高压气瓶组回收储存利用液货舱蒸发气的*** Download PDFInfo
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Abstract
本发明公开了一种用管束式高压气瓶组回收储存利用LNG船液货舱蒸发气的***,包括防真空阀,燃气压缩机,热交换器,管束式高压储气瓶组,气体压力调节阀和缓冲气瓶依次相连接至燃气主机,为主机提供LNG BOG气体燃料。本发明实现了在常温下回收、储存、利用液货舱蒸发气,控制货舱压力在安全范围内,解决了LNG BOG过剩或不足的问题,为主机提供稳定的BOG燃料供应,避免了把LNG蒸发气排放到大气、配置昂贵的再液化装置或气体燃烧装置,避免了使用绝缘隔热材料和低温钢。本发明实现了节能减排,节约天然气,绿色环保,成本低,布置灵活,可普遍使用。
Description
【技术领域】
本发明涉及水上交通运输装备制造技术领域,具体涉及一种用管束式高压气瓶组回收储存利用LNG船液货舱蒸发气以供给气体燃料主机/发电机使用的***。
【背景技术】
LNG船在常压-163℃运输、储存液化天然气,由于受到外部环境热量的影响,船舶的运动,LNG舱内深潜泵运行时产生的热量,会使舱内LNG蒸发而产生蒸发气BOG,为了保持LNG液货舱压力在安全范围内,必须不断地排出这些BOG气体。目前主要有以下几种方法处理这些BOG,这些方法有以下缺点:
1.最常用的方法是BOG被气体燃料主机、发电机利用,经常出现BOG不足或过剩的问题。尤其是大型LNG船,装货量大,在满载、停泊或在进出港口机动航行时经常出现BOG过剩的情况,在压载航行工况时,又经常出现BOG不足的问题。
2.过剩的BOG释放到大气中去(空放),浪费资源,污染环境,易燃易爆,不安全,甲烷的温室效应高于二氧化碳,港口也不允许这样排放。
3.用气体燃烧装置(GCU)烧掉,浪费资源,污染环境。
4.通过再液化装置液化,重新注入液货舱。再液化装置昂贵,能量消耗过大,经济性差。
另外,LNG在充装期间也会产生大量的BOG,在卸货或转驳时又需要给货舱补充BOG以防止出现真空,因此,如何低成本地回收、储存、安全有效地利用这些BOG,是一个亟待解决的课题。
【发明内容】
发明目的:本发明的目的是为了解决现有技术中的不足,提出了一种用管束式并联式高压气瓶组回收储存利用LNG船液货舱蒸发气以供给气体燃料主机/发电机使用的***,实现了在常温下回收、储存、利用液货舱蒸发气,控制货舱压力在安全范围内,解决了LNG BOG过剩或不足的问题,为主机提供稳定的BOG燃料供应,避免了把LNG蒸发气排放到大气或者配置昂贵的再液化装置或气体燃烧装置,避免了使用绝缘隔热材料和低温钢。本发明采用直径较小的气瓶组以承受更高的设计压力,具有更高的压缩体积比,从而在相同的容积内储存更多的BOG气体,布局灵活,成本低,安全性能好。
技术方案:本发明所述的一种用管束式并联式高压气瓶组回收储存利用LNG船货舱蒸发气以供给气体燃料主机/发电机使用的***,包括BOG控制***和管束式高压气瓶室。所述BOG控制***主要包括防真空压力控制阀,止回阀,压力温度传感器,3级燃气空压机,热交换器,3级气体压力调节阀,缓冲气瓶。所述管束式高压气瓶室设有高压气瓶组,液压遥控截止阀,防爆装置,可燃气体探测报警器,应急压力释放阀,喷淋管路和设备。
其工作过程为:首先,从LNG船液货舱自然蒸发的气体BOG依次经过压力表,防真空压力控制阀,温度计,流量计,过滤器,进入3级燃气空压机将压力提高到最高25MPa,体积压缩至最小1/250,再经过换热器使气体温度保持在-30℃~45℃范围内,经过止回阀进入高压气瓶组储存。其次,从高压气瓶组出来的BOG气体经过压力表,液压遥控截止阀,止回阀,3级气体压力调节阀,缓冲气瓶进入机舱内燃气主机/发电机使用。
进一步的,所述管束式高压气瓶组采用并联式的高压气瓶,其数量、规格和大小根据不同的船舶设计,也可以采用标准成熟的产品。
进一步的,所述管束式高压气瓶组室通入氮气,与船舶氮气发生器相连,设置可燃气体探测报警器,应急压力释放阀,防爆装置。
进一步的,所述的应急压力释放阀与船舶泄放塔相连,应急情况下,释放气体进入泄放塔排放,保证整个***的安全。
进一步的,所述燃气压缩机包括三台相互串联的空压机以逐级提高气体的压力和减少体积。
进一步的,所述气体压力调节阀包括三台互相串联的气体压力调节阀以逐级降低气体的压力与燃气主机/发电机的进口压力匹配。
进一步的,所述管束式高压气瓶组室顶部设置喷淋管路,与船舶喷淋***连接。
有益效果:
1.本发明实现了在常温下回收、储存、利用液货舱蒸发气,控制货舱压力在安全范围内,解决了LNG BOG过剩或不足的问题,为主机提供稳定的BOG燃料供应,避免了把LNG蒸发气排放到大气、配置昂贵的再液化装置或气体燃烧装置,避免了使用绝缘隔热材料和低温钢。
2.本发明实现了节能减排,节约天然气,绿色环保,成本低,布置灵活,可普遍使用。
3.本发明实现了控制液舱气体压力在安全范围内。
4.本发明避免了把LNG船的货舱压力设计的很大,降低了船舶建造成本。
5.本发明适用于国际海事组织IMO出版的《国际散装运输液化气体船舶构造和设备规则》(IGC规则,2014版)中定义的薄膜型,A型、B型、C型独立液货舱LNG船及LNG加注船。
【附图说明】
图1是根据本发明实施例的一种用管束式高压气瓶组回收储存利用LNG船液货舱蒸发气的***图;
图2是管束式高压气瓶室布置图;
图3是图2的A-A剖面说明图。
图中:
1、船舶液化天然气船液货舱;2、液化天然气LNG;3、液化天然气蒸发气BOG;4、压力表;5、防真空压力控制阀;6、温度计;7、流量计;8、过滤器;9、燃气压缩机;10、液压遥控截止阀;11、摆式止回阀;12、热交换器;13、管束式高压气瓶组室;14、气体压力调节阀;15、缓冲气瓶;16、船舶燃气主机/发电机;
60、高压气瓶组;61、支撑结构;62、防爆装置PRD;63、液压遥控截止阀;64、压力表;65、可燃气体探测报警器;66、应急压力释放阀;67、泄放塔;68、喷淋管路和设备。
【具体实施方式】
下面结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述。
参阅图1所示的一种用管束式高压气瓶组回收储存利用LNG船液货舱蒸发气以供给气体燃料主机/发电机使用的***,包括BOG控制***和管束式高压气瓶组室13。所述BOG控制***包括压力表4,防真空压力控制阀5,温度计6,流量计7,过滤器8,燃气压缩机9,液压遥控截止阀10,摆式止回阀11,热交换器12,依次相连接至管束式高压气瓶组室13,再经过压力表4,液压遥控截止阀10,摆式止回阀11,气体压力调节阀14,缓冲气瓶15,液压遥控截止阀10,摆式止回阀11连接至燃气主机/发电机使用。
参阅图2所示的管束式高压气瓶室布置图,包括高压气瓶组60,气瓶支撑结构61,液压遥控截止阀63,防爆装置62,可燃气体探测报警器65,应急压力释放阀66,喷淋管路和设备68。其工作过程为:首先,从LNG船液货舱1自然蒸发的气体3依次经过压力表4,防真空压力控制阀5,温度计6,流量计7,过滤器8,进入3级燃气空压机9将压力提高到最高25MPa,体积压缩至最小1/250,再经过换热器12使气体温度保持在-30℃~45℃范围内,经过液压遥控截止阀10,摆式止回阀11进入高压气瓶组13储存。其次,从高压气瓶组13出来的BOG气体经过压力表4,液压遥控截止阀10,摆式止回阀11,3级气体压力调节阀14,热交换器12使BOG的温度和压力与燃气主机/发电机相匹配,再经过液压遥控截止阀10,摆式止回阀11进入机舱内燃气主机/发电机使用。
作为上述实施例的进一步优化:
优选的,所述管束式高压气瓶组60采用并联式的高压气瓶,其数量、规格和大小根据不同的船舶设计,也可以采用标准成熟的产品。
优选的,所述管束式高压气瓶组室13通入氮气,与船舶氮气发生器相连,设置可燃气体探测报警器65,应急压力释放阀66,防爆装置62。
优选的,所述的应急压力释放阀66与船舶泄放塔67相连,应急情况下,释放气体进入泄放塔排放,保证整个***的安全。
优选的,所述燃气压缩机9包括三台相互串联的空压机以逐级提高气体的压力和减少体积。
优选的,所述气体压力调节阀14包括三台互相串联的气体压力调节阀以逐级降低气体的压力与燃气主机/发电机的进口压力匹配。
优选的,所述管束式高压气瓶组室13顶部设置喷淋管路68和液压遥控截止阀63,与船舶喷淋***连接,液压遥控截止阀常闭。
优选的,所述液压遥控截止阀10和63,可以遥控也可以手动控制。
优选的,在LNG充装或转驳时,将BOG压缩储存在高压气瓶组中。
优选的,通过本发明来回收储存BOG气体,避免了过多的BOG气体造成液货舱压力升高,因此,可以降低LNG船液货舱的设计压力,降低造船成本。
本发明实现了在常温下回收、储存、利用液货舱蒸发气,控制货舱压力在安全范围内,解决了LNG BOG过剩或不足的问题,为主机提供稳定的BOG燃料供应,避免了把LNG蒸发气排放到大气、配置昂贵的再液化装置或气体燃烧装置,避免了使用绝缘隔热材料和低温钢。
以上所述仅是本发明的一部分较佳实施例而已,并非对本发明作任何形式上的限制,虽然本发明以较佳实施例揭露如上,然而并非用以限制本发明,任何熟悉本专业的工程技术人员,在不脱离本发明技术方案范围内,当可利用上述揭示的技术内容作出些许变化或修改为等同变化的等效实施例,但凡是未脱离本发明技术方案的内容,依据本发明的技术实质对以上实施例所做的任何简单修改、等同变化与修饰,均属于本发明技术方案的范围内。
Claims (8)
1.一种用管束式高压气瓶组回收储存利用LNG船液货舱蒸发气以供给气体燃料主机/发电机使用的***,其特征在于:将船舶液化天然气液货舱(1),压力表(4),防真空压力控制阀(5),温度计(6),燃气压缩机(9),液压遥控截止阀(10),摆式止回阀(11),热交换器(12),依次相连接至管束式高压气瓶组室(13),再经过气体压力调节阀(14),缓冲气瓶(15)连接至燃气主机/发电机(16)。
2.根据权利要求1所述的一种用管束式高压气瓶组回收储存利用LNG船液货舱蒸发气以供给气体燃料主机/发电机使用的***,其特征在于:所述管束式高压气瓶组室(13)包括管束式并联式高压气瓶组(60),可燃气体探测报警器(65),应急压力释放阀(66),喷淋管路和设备(68)。
3.根据权利要求1所述的一种用管束式高压气瓶组回收储存利用LNG船液货舱蒸发气以供给气体燃料主机/发电机使用的***,其特征在于:所述防真空压力控制阀(5)控制LNG液舱的BOG压力在液货舱设计的安全压力范围内。
4.根据权利要求1所述的一种用管束式高压气瓶组回收储存利用LNG船液货舱蒸发气以供给气体燃料主机/发电机使用的***,其特征在于:所述燃气压缩机(9)采用至少3级串联压缩技术,使气体压力达到最高25MPa。
5.根据权利要求1所述的一种用管束式高压气瓶组回收储存利用LNG船液货舱蒸发气以供给气体燃料主机/发电机使用的***,其特征在于:所述热交换器(12)的出口温度为-30℃~45℃。
6.根据权利要求2所述的一种用管束式高压气瓶组回收储存利用LNG船液货舱蒸发气以供给气体燃料主机/发电机使用的***,其特征在于:所述管束式并联式高压气瓶组包括防爆装置(62),压力表(4)和液压遥控截止阀(63)。
7.根据权利要求1所述的一种用管束式高压气瓶组回收储存利用LNG船液货舱蒸发气以供给气体燃料主机/发电机使用的***,其特征在于:所述气体压力调节阀(14)采用至少3级降压技术使得出口压力与船舶燃气主机/发电机(16)的进口压力相匹配,并通过缓冲气瓶(15)保持供给压力稳定。
8.根据权利要求1所述的一种用管束式高压气瓶组回收储存利用LNG船液货舱蒸发气以供给气体燃料主机/发电机使用的***,其特征在于:可燃气体探测报警器(65),应急压力释放阀(66)和泄放塔(67)相连接。
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