CN111801231A - 用于在车辆发动机由lng驱动的冷藏车中供冷的传热装置 - Google Patents
用于在车辆发动机由lng驱动的冷藏车中供冷的传热装置 Download PDFInfo
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Abstract
本发明涉及一种传热装置,其用于在冷藏车中供冷,冷藏车由事先要被再气化的液化天然气(LNG)驱动。根据本发明,利用在散热的冷藏空间空气和在吸热的、在直至‑161℃下蒸发的LNG之间在此存在的大的温差,通过引入的、在闭合回路中循环的中间介质引导热流。由此可以避免在可能发生泄漏的情况下可燃的天然气进入周围环境中的风险。作为中间介质,有液态的载热介质供使用,该液态的载热介质是不可燃的、是对环境无害的并且同时是低粘度的,即,是可很好地泵送的,但其工作温度不得低于‑85℃。该条件将借助于附加的热阻来满足,该附加的热阻被如此地集成到蒸发LNG的热交换器中,即热流在此以明显更大的,即,足够的温度下降流动。根据本发明,干燥气体的薄保护层用作以这种方式起作用的热阻,该保护层有利地借助于同轴地包围管壳式热交换器的管的护套管形成。然后,通过监控在该层中的压力还可以确定可能逸出的天然气并且使LNG供应中断。在从属权利要求中给出了其他有利的特征。
Description
技术领域
本发明涉及对使用低温液化天然气LNG(liquified natural gas)作为驱动能量的冷藏车供冷。
背景技术
用于驱动机动车辆发动机的低温液化天然气通常借助于环境空气和/或发动机废热进行蒸发,以达到再气化的目的。在此情况下释放的有能量价值的制冷量往往没有得到利用,但情况并非一定要如此。而是应将其回收并作为运输制冷提供给冷藏车。
现有技术为此提供以下在专利说明书中记载的技术方案。
在文献DE 195 31 122和EP 0 788 908中描述了一种冷却装置,该冷却装置冷却冷藏车的运输空间,该冷藏车的车辆发动机通过再气化的LNG运行。在低温绝缘罐中携带的低温LNG经由气密密封的系统被泵送到运输空间中,并且在那里通过从循环的运输空间空气中吸收热量在热交换器中被蒸发。与该热交换器附加地并联了一个潜冷蓄冷器,其也将热量从蓄热材料散发到要蒸发的、气密密封的LNG。蒸发的LNG最终作为气态燃料流向发动机。
如果在发动机停止时LNG流动中断,可以借助于蓄冷器,通过循环的空间空气加热蓄热材料,来保持运输空间的冷却。在文献中展示了一种鞍式牵引车,其具有包含LNG罐的鞍式牵引机和鞍式挂车,鞍式挂车包含带有空气冷却器和蓄冷器的运输空间。液态LNG供应管线和蒸发的LNG引出管线,并且因此也包括鞍式牵引机和鞍式挂车,可以借助于联接器在控制的工作压力下分离而不发生泄漏。在此时中断的LNG流期间,蓄冷器可以继续进行冷却。所提出的冷却技术的优点是具有非常简单的设计。但是,该优点被一个主要缺点抵消,即由泵、管线、联接器和热交换器组成的整个系统面临以下风险:当LNG的温度低至-161℃时,材料负荷能力降低,有可能引起泄漏,导致可燃的天然气进入运输空间和运输车辆的环境中。
在DE 10 2010 020 476中也描述了一种由低温LNG驱动的冷藏车,其中,与LNG罐平行地携带了一个额外的含有低温液化氮的罐,成本相当高。它的再气化使得在为此设置的热交换器中可以为储存在运输空间中的冷藏货物提供宝贵的制冷量,不仅在行驶运行期间,而且在关闭发动机时的停止期间,由此生成的气态氮被安全地排放到环境中。在发动机运行期间,在权衡可燃天然气的上述潜在危险下,实现并行地或替代地使用通过低温LNG的再气化释放的制冷量。
最后,对于使用低温LNG运行的冷藏车,在文献WO 2011/141287和US 2013/0055728中提出了一种技术方案,该技术方案为了回收制冷量而采用液态的不可燃的中间介质来工作,从而排除了在运输空间的区域中由天然气带来的危险。显示了具有牵引机和挂车的鞍式牵引车,与通常一样,要冷却的运输空间位于其中。在运输空间中,为了冷却,从循环空气中将要散发的热量在热交换器中传递给中间介质。中间介质借助于泵在封闭的传热回路中被引导,但是该传热回路可以借助于通过联接器和部分柔性的管线分开。中间介质在此将吸收的热量传输到放置在牵引机上的在LNG储罐和内燃机附近的第二热交换器,以将热量在此处传递到由泵供应的LNG。就一方面由于低温引起的材料负荷和另一方面可燃天然气的潜在危险而言,因此被LNG加载的部件在牵引车上的紧凑的、满足于短的管线路径的布置可以被认为是有利的。然而,所提出的将热量传递到LNG的方法具有一个主要缺点。它通过分隔中间介质和LNG的壁进行回流换热。由于一方面通过薄壁的热传导和另一方面向蒸发的LNG的热传递的传输阻力非常小,因此所述壁在由中间介质加载的一侧上的表面温度与LNG的温度之间仅仅具有非常微小的差异。因此,中间介质必须如此设计,使其低至LNG的温度,即低至-161℃都不会冻结而是可流动的。可供使用的这种液态的中间介质仅是极其有限的并且也仅是非常昂贵的,对该中间介质还附加地要求其在泄漏的情况下对环境是无害的,特别是对储存在运输空间中的冷藏货物是无害。
另外,由于低温和由其引起的中间介质的高粘度,将其输送到运输空间的热交换器中需要高的泵送功率。因此,所提出的技术也不令人满意。
发明内容
目的
从上述现有技术,特别是从其缺点中引出了根据本发明的目的。该目的在本质上在于开发一种传热装置,其用于为采用低温液化天然气驱动的冷藏车提供运输制冷。在此情况下,要通过空气循环从冷藏空间和位于冷藏空间中的冷藏货物中抽出热量,然后传递到要蒸发的LNG,但前提是,安全地控制LNG的极低的温度水平,该温度水平可以为低至-161℃。特别是要避免这样的危险:在发生损坏的情况下,天然气NG(natural gas)进入冷藏车的冷藏空间和/或进入可能停放冷藏车的封闭空间内。如果冷藏空间位于鞍式牵引车的鞍式挂车中,则必须另外考虑到,LNG罐所在的鞍式牵引机可以很容易地与鞍式挂车分开。
为了实现这些目的,必须规定适当的技术手段。
目的的解决方案
该目的的解决方案在权利要求1中给出。
从属权利要求包含有利的设计方案。
本发明利用了这样的事实情况:在冷藏车的运输空间中的冷却空气只能冷却至最低-30℃,因此对于将热量传输到LNG,存在非常高的驱动温度差供使用,允许通过液态中间介质进行热传递,以由此确保免受LNG的低温水平引起的潜在危险,即避免材料负荷能力的降低和避免可燃气体的可能的泄漏。
为此目的,热阻即,将在热阻Rth上降低的驱动温差ΔT和在其中进行LNG的蒸发的回流换热的热交换器要传递的热输出量的商故意提高,使分隔散热材料流与吸热材料流的壁的温度在背离LNG的表面上如此之高,以至于润湿它的中间介质不会冻结并且能够安全地流动。如果中间介质的允许的冷却不需要太深,例如仅需冷却至-85℃,则可以非常容易地获得合适的传热介质供使用。
尽管有严格的空间分隔,由循环泵在封闭的传热回路中输送的液态中间介质仍可以实现在输送空间中的空气冷却器与LNG蒸发器之间的有效连接,并因此实现由低温LNG加载的组件即LNG储存器、LNG泵和LNG热交换器的例如在鞍式牵引车的牵引机上的紧凑联合的、简单固定的布置,并且同时实现用于通过再气化产生的可燃气体到内燃机的短的管线路径。此外,中间介质的环境友好性允许在绝缘的、部分柔性的管线中引导的回路中借助于在两侧封锁的快速封锁联接器打开,以便例如将鞍式牵引车的挂车与牵引机分离开。
有利地,在由低温材料制成的管壳式热交换器中进行向LNG的热传递,该管壳式热交换器引导在管中的要蒸发的LNG和在夹套空间中的散热的中间介质,并且被如此地设计,即,由于在运行中发生的在时间上和局部上的大的温度变化不引起不可控制的机械应力。有利地,具有浮头和两个夹套路径的壳管式热交换器是合适的。本发明提出将附加的热阻插入到管壳式热交换器中,该附加的热阻有针对性地扩大了通常存在的热阻。根据本发明,这通过布置同轴延伸的保护管来实现,该保护管如此地包围引导LNG的传热管,形成一个气密密封的、可用干燥气体例如氮气或空气填充的中间空间,该中间空间在管之间的小厚度被如此地设计,即保护管的面对中间介质的表面上形成期望的足够高的温度。
作为进一步的安全技术措施,建议将气密地封闭在同轴的管之间和在管板之间的自由空间中的干燥气体的压力选择为明显低于最小LNG压力,由此在泄漏时由于侵入的天然气而发生的压力升高会触发为此设置的安全压力开关,并且通过该安全压力开关触发对LNG供应的切断。由于在壳管式热交换器中增大的热阻,为了确保必要的传热能力,必须增大传热面积,该缺点现在通过已有的方法,即选择同样有效且廉价的液态中间介质来补偿。在这方面,Therminol D12是一种有利的解决方案。它是基于脂肪烃的合成传热液体,该合成传热液体作为传热液体低至-85℃都不会冻结并且是可泵送的,其在故障情况下发生泄漏时对环境是无害的,并且允许与食物发生偶尔无意的接触。
液态中间介质在冷藏车的运输空间中传递制冷量,也就是说,它从要冷却的空气中吸收要传输到LNG的热量。为此使用在内部用中间介质加载的和在外部用风扇输送的冷藏空间空气加载的翅片管式热交换器。在外部通过高的翅片和通过空气的高流速可以如此有利地实现热传递,而在内部通过中间介质的高流速可以如此有利地实现热传递,即使得热传递的热阻最小化,并且中间介质的由此最大化的温度降低了粘度,并且因此使确保强制循环的循环泵的相应驱动功率减小。
具体实施方式
在下面的实施例中,借助于在根据本发明设计的传热装置的图1的示意图更详细地解释本发明,该传热装置用于在冷藏车中供冷,该冷藏车的车辆发动机由LNG驱动。被以低温水平为特征的LNG加载的所有组件均由耐低温材料制成。全部处在低温下的组件通过绝缘来保护免受不期望的热量侵入。
在冷藏车中在储存器中携带的低温LNG在为此设置的管壳式热交换器(9)中被再气化,以便作为气态天然气(15)来驱动机动车发动机。在此用于蒸发LNG所需的热量通过液态中间介质(5)的散热的材料流进行传递,该液态中间介质在气密密闭的传热回路中在使用柔性软管管线(7)和循环泵(8)下在中间介质(5)入口和出口(12、13)处在强制循环下被引导进入或流出夹套空间并且本身通过翅片管式热交换器(3)从在冷藏车的运输空间中借助于风扇(2)循环的冷却空气(1)中获取热量作为制冷量。
LNG蒸发器被设计为具有浮头和两个夹套路径的管壳式热交换器(9),这样在运行中发生的在时间上和局部上的大的温度变化不引起不可控制的机械应力。在LNG入口(14)处注入的低温LNG经由热交换器罩(16)进入并经由管底板(17)分配到引导LNG的传热管(18)上,流到在管壳式热交换器(9)的浮头中的偏转罩(19),被偏转并流动,再次被引导到传热管(18)中,返回到管底板(17),以便从那里进入到用隔板隔开的传热罩(16)的上部,并且最后经由出口接管(15)部分地或全部地被再气化,直接地或经由用发动机废热运行的附加热交换器,到达冷藏车的内燃机。管壳式热交换器(9)的所有引导LNG的传热管(18)被同轴延伸的保护管(21)包围,保护管由为此设置的附加的管底板支撑,使得在引导LNG的传热管(18)和保护管(21)之间的中间空间,以及在端部处的管底板之间的空间,其被充满作为保护气体的干燥气体(22),起着热阻的作用,该热阻与通过简单的管壁形成的通常的传热的传输热阻叠加。由有针对性地增加的、与从中间介质(5)到LNG的热传输相反的热阻,产生明显增加的驱动温度差,结果是,被中间介质(5)润湿的保护管(21)的表面温度明显高于冷至-161℃的LNG。在此前提下,即,如果适当地选择干燥的保护气体(22),例如氮气或空气的通常非常薄的层厚,则可获得这样的中间介质(5),其既不会冻结也不会由于粘度太高而不能泵送。
由于在LNG蒸发器中增大的热阻,为了确保必要的热传递,必须增大传热面积,该缺点现在通过已有的方法,即选择同样有效且廉价的液态中间介质(5)来补偿。在这方面,Therminol D12是一种有利的解决方案。它是基于脂肪烃的合成传热液体,该合成传热液体作为传热液体在低至-85℃是可泵送的,其在故障情况下发生泄漏时对环境是无害的,并且允许与食物发生偶尔无意的接触。中间介质(5)经由在入口(12)处的接管进入管壳式热交换器(9)的通过分隔板(20)分隔的夹套空间中,并经由产生的两个夹套路径在与LNG逆流下流向在出口(13)处的接管。
作为进一步的安全技术措施,建议将气密地封闭在同轴的管之间和在管板之间的自由空间中的干燥气体(22)的压力选择为明显低于最小LNG压力,由此在泄漏时由于侵入的天然气而发生的压力升高会触发为此设置的安全压力开关(24),并且通过该安全压力开关触发对LNG供应的切断。
液态中间介质(5)在冷藏车的运输空间中传递制冷量,也就是说,它从冷藏空间空气(1)中吸收要传输到LNG的热量。为此使用在内部用液体中间介质(5)和在外部用风扇(2)输送的冷藏空间空气加载的翅片管式热交换器(3)。在外部通过高的翅片和通过冷藏空间空气(1)的高流速可以如此有利地实现热传递,而在内部通过中间介质(5)的高流速可以如此有利地实现热传递,即,使得热传递的热阻最小化,并且中间介质(5)的由此最大化的温度使粘度降低,并且因此使确保强制循环的循环泵(8)的相应驱动功率减小。
此外,中间介质(5)的环境友好性允许在绝缘的、部分柔性的软管管线(7)中引导的回路可以借助于在两侧封锁的快速封锁联接器(6)打开,以便例如将鞍式牵引车的挂车与牵引机分离开。
附图标记列表
LNG 液化天然气(liquified natural gas)
NG 再气化天然气
Rth 热阻
ΔT 温差
PHZ 压力、上限值、通过触发进行保护或与安全相关的开关功能
1 冷藏空间空气
2 风扇
3 翅片管式热交换器
4 绝缘的冷藏空间壁
5 传热的中间介质
6 两侧封锁的快速封锁联接器
7 柔性管线
8 循环泵
9 管壳式热交换器(带有浮头和两个夹套路径)
10 绝缘材料
11 绝缘材料
12 中间介质进入夹套空间的入口
13 中间介质从夹套空间流出的出口
14 LNG入口
15 用于蒸发的LNG的出口接管
16 带有隔板和LNG接管的热交换器罩
17 管底板
18 引导LNG的传热管
19 (在管壳式热交换器的浮头中的)偏转罩
20 (在管壳式热交换器的夹套空间中的)分隔板
21 保护管(与引导LNG的管同轴)
22 干燥气体(作为气密密封的保护气体)
23 维修阀
24 安全压力开关(当压力升高时关闭LNG供应。)
权利要求书(按照条约第19条的修改)
1.一种传热装置,其用于通过蒸发液化天然气(LNG)在冷藏车中供冷,其中,一方面再气化的天然气(NG)被提供用来驱动冷藏车的发动机,并且另一方面可供使用的制冷量可以用来冷却要通过冷藏车运输的冷藏货物,其中,布置在冷藏空间中的热交换器(3)与位于冷藏空间外部的作为LNG蒸发器的热交换器(9)在严格的空间分隔下处于有效连接,由此可以从冷藏空间中抽取热量并且可以借助于风扇输送的冷藏空间空气(1)和热交换器(3)散发热量,并且是在使用在闭合回路中在热交换器(3)和热交换器(9)之间的强制循环下引导的液态中间介质(5)下,所述液态中间介质作为基于脂族烃的合成传热液体低至-85℃都不会冻结并且是可泵送的,如果在故障情况下发生泄漏,对环境是无害的,并且允许与食物发生偶尔无意的接触,
其特征在于,为了蒸发经由LNG入口(14)流入的LNG,使用由低温材料制成的管壳式热交换器(9),所述热交换器将在传热管(18)中的要蒸发的LNG和在夹套空间中的传热的中间介质(5)从入口(12)引导到出口(13),并且被实施为具有浮头和两个夹套路径的壳管式热交换器(9),由此,由于在运行中发生的在时间上和局部上的大的温度变化仅仅引起可控制的机械应力,并且其中,同轴布置的保护管(21)如此地包围引导LNG的传热管(18),即,形成一个气密密封的、可用干燥气体(22)填充的中间空间,它的在管(18和21)之间的小厚度被如此地设计,即,在此热阻(Rth)使温度下降,该温度下降排除了中间介质(5)冻结在保护管(21)的表面上。
2.根据权利要求1所述的传热装置,
其特征在于,气密密封的干燥气体(22)的压力被选择为明显低于最小LNG压力,由此确保在泄漏时由于侵入的天然气而发生的压力升高会触发为此设置的安全压力开关(24)并且通过该安全压力开关触发对LNG供应的切断。
3.根据权利要求1所述的传热装置,
其特征在于,由风扇(2)输送的冷藏空间空气(1)的热量可以传递到内部的被用中间介质(5)加载的翅片管式热交换器(3)的翅片上,在翅片管式热交换器处,在外部通过高的翅片和通过冷藏空间空气(1)的高流速可以如此有利地实现热传递,而在内部通过中间介质(5)的高流速可以如此有利地实现热传递,即,使得热阻即,使在热阻上降低的驱动温差(ΔT)和传热的热输出量构成的商最小化,并且中间介质(5)的由此最大化的温度使粘度降低并且因此使循环泵(8)的相应驱动功率减小。
4.根据权利要求1所述的传热装置,
其特征在于,将热量从翅片管式热交换器(3)传输到管壳式热交换器(9)的中间介质(5)在设有绝缘材料(10)的并且至少部分是柔性的管线(7)中被引导,所述管线可以借助于在两侧封锁的快速封锁联接器(6)分离开。
Claims (5)
1.一种传热装置,其用于通过蒸发液化天然气(LNG)在冷藏车中供冷,其中,一方面再气化的天然气(NG)被提供用来驱动冷藏车的发动机,并且另一方面可供使用的制冷量用来冷却要通过冷藏车运输的冷藏货物,
其特征在于,布置在冷藏空间中的翅片管式热交换器(3)与位于冷藏空间外部的作为LNG蒸发器的管壳式热交换器(9)在严格的空间分隔下处于有效连接,由此可以从冷藏空间中抽取热量并且可以借助于风扇输送的冷藏空间空气(1)和翅片管式热交换器(3)散发热量,并且是在使用在闭合回路中在翅片管式热交换器(3)和管壳式热交换器(9)之间的强制循环下引导的液态中间介质(5)下,所述液态中间介质作为基于脂族烃的合成传热液体低至-85℃都不会冻结并且是可泵送的,如果在故障情况下发生泄漏,对环境是无害的,并且允许与食物发生偶尔无意的接触。
3.根据权利要求1所述的传热装置,
其特征在于,将热量从翅片管式热交换器(3)传输到管壳式热交换器(9)的中间介质(5)在设有绝缘材料(10)的并且至少部分是柔性的管线(7)中被引导,所述管线可以借助于在两侧封锁的快速封锁联接器(6)分离开。
4.根据权利要求1所述的传热装置,
其特征在于,为了蒸发经由LNG入口(14)流入的LNG,使用由低温材料制成的管壳式热交换器(9),所述管壳式热交换器将在传热管(18)中的要蒸发的LNG和在夹套空间中的传热的中间介质(5)从入口(12)引导到出口(13),并且被设计为具有浮头和两个夹套路径的壳管式热交换器(9),由此,由于在运行中发生的在时间上和局部上的大的温度变化仅仅引起可控制的机械应力,并且其中,同轴布置的保护管(21)如此地包围引导LNG的传热管(18),即形成一个气密密封的、可用干燥气体(22)填充的中间空间,它的在管(18和21)之间的小厚度被如此地设计,即,在此热阻(Rth)使温度下降,该温度下降排除了中间介质(5)冻结在保护管(21)的表面上。
5.根据权利要求4所述的传热装置,
其特征在于,气密密封的干燥气体(22)的压力被选择为明显低于最小LNG压力,由此确保在泄漏时由于侵入的天然气而发生的压力升高会触发为此设置的安全压力开关(24)并且通过该安全压力开关触发对LNG供应的切断。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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DE102017012125.7A DE102017012125A1 (de) | 2017-12-29 | 2017-12-29 | Wärmeübertragungseinrichtung für die Kältebereitstellung in Kühlfahrzeugen, deren Kraftfahrzeugmotor mit LNG angetrieben wird |
DE102017012125.7 | 2017-12-29 | ||
PCT/DE2018/000360 WO2019129320A1 (de) | 2017-12-29 | 2018-12-05 | Wärmeübertragungseinrichtung für die kältebereitstellung in kühlfahrzeugen, deren kraftfahrzeugmotor mit lng angetrieben wird |
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CN111801231A true CN111801231A (zh) | 2020-10-20 |
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US (1) | US20210379967A1 (zh) |
EP (1) | EP3732069B1 (zh) |
CN (1) | CN111801231A (zh) |
DE (2) | DE102017012125A1 (zh) |
ES (1) | ES2910116T3 (zh) |
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CN114199303A (zh) * | 2021-11-02 | 2022-03-18 | 华能核能技术研究院有限公司 | 一种用于高温气冷堆的一回路湿度测量装置 |
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EP3798030B1 (en) * | 2019-09-25 | 2022-08-03 | Ningbo Geely Automobile Research & Development Co. Ltd. | Air conditioning system for a vehicle |
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- 2018-12-05 US US16/956,851 patent/US20210379967A1/en not_active Abandoned
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US20210379967A1 (en) | 2021-12-09 |
EP3732069A1 (de) | 2020-11-04 |
PL3732069T3 (pl) | 2022-07-04 |
DE112018006645A5 (de) | 2020-11-19 |
EP3732069B1 (de) | 2022-01-05 |
WO2019129320A1 (de) | 2019-07-04 |
DE102017012125A1 (de) | 2019-07-04 |
ES2910116T3 (es) | 2022-05-11 |
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