CN101479871A - 燃料电池系统 - Google Patents
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- 239000007800 oxidant agent Substances 0.000 claims abstract description 27
- 230000001590 oxidative effect Effects 0.000 claims abstract description 27
- 239000007789 gas Substances 0.000 claims abstract description 16
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 10
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
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- 229910052760 oxygen Inorganic materials 0.000 description 2
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- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
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- 239000000203 mixture Substances 0.000 description 1
- 230000001473 noxious effect Effects 0.000 description 1
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Abstract
本发明涉及一种燃料电池系统,包括:燃料电池(26),对其阳极端供应富氢气体,并对其阴极端供应氧化剂,以便在燃料电池(26)内将富氢气体和氧化剂反应成阳极废气和阴极废气;补燃器(36),对其供应阳极废气;以及热交换器(46),对其供应补燃器(36)的废气,并利用该补燃气器废气对供应给燃料电池(26)阴极端的氧化剂进行预热。根据本发明,能够经由阴极废气线路(44)将阴极废气供应到在补燃器(36)下游的热交换器(46)。本发明还涉及包括这种燃料电池系统的机动车辆。
Description
技术领域
本发明涉及燃料电池系统,包括:燃料电池,用于在阳极端供应富氢气体,并在阴极端供应氧化剂,在燃料电池内将富氢气体和氧化剂反应成阳极废气和阴极废气;补燃器,其接收阳极废气供应;以及热交换器,其接收补燃器废气供应,并且利用该热交换器可以对供应给燃料电池的阴极端的氧化剂进行预热。
本发明还涉及包括一个这种燃料电池系统的机动车辆。
背景技术
燃料电池系统用于将化学能转换为电能。这种系统的中心部件是燃料电池,其通过氢和氧的控制反应释放电能。由于氢和氧在燃料电池或燃料电池堆中起反应,所以必须控制燃料,使得供应给燃料电池阳极的气体包括尽可能高的氢百分比,这是重整装置的任务。供应给燃料电池阳极端的富氢气体在阳极端作为阳极废气输出释放,类似地,供应给阴极端的氧化剂在阴极端作为阴极废气输出释放。为了燃烧燃料电池的阳极废气,燃料电池系统通常采用补燃器,其包括固有的空气供应或者利用燃料电池的阴极废气。后一种原理的益处在于,阴极废气中的热能通常经由位于补燃器下游的热交换器得到回收,从而消除了在阴极废气线路上对额外回收器的需要。例如,在DE 101 42 578 A1中公开了一个这种燃料电池系统。然而,现有技术的缺点在于在使用阴极废气燃烧阳极废气时对补燃器进行闭环控制难于实现,或者实际上不可实现,这是因为指定到阳极废气流的阴极废气流是固定的。
因而,本发明的目的是改进通用燃料电池系统,使得可以对补燃器进行更好控制,而同时利用阴极废气的热能。
发明内容
该目的通过权利要求1所述特征实现。
本发明的有益方面和其它实施例如从属权利要求所述。
根据本发明的燃料电池系统基于通用现有技术,其中,能够经由阴极废气线路将阴极废气供应到补燃器下游的热交换器。这样实现了对补燃器的良好开环或闭环控制,并且同时仅利用单个热交换器回收来自阳极废气和阴极废气的热能。阳极废气的热能留在离开补燃器的废气中,并在补燃器下游的热交换器中利用该热能来预热阴极进料空气。通过使阴极废气绕过补燃器,可以单独为补燃器提供氧化剂,并且尽管如此,依然利用阴极废气的热能来预热阴极进料空气。利用对补燃器单独提供氧化剂的可能性,有益地中断了阴极空气和阴极废气的连通。该结构的其它益处是通过利用阳极和阴极废气的热能,减轻了补燃器的热压。
此外,根据本发明的燃料电池系统还可以进行改进,即设置阀门,通过该阀门可以全部或部分地分流燃料电池和热交换器之间的阴极废气,从而获得快速启动的益处。如果启动系统时要将阴极废气全部提供给热交换器,则充分预热阴极进料空气需要更长的时间。这就是为什么通过该阀门可以控制对热交换器的阴极废气供应,这意味着,实践中,在燃料电池系统的启动阶段,向热交换器供应的阴极废气很少或者没有,而是仅供应较热的补燃器废气。在启动阶段以后,当阴极废气足够热时,可以将阴极废气完全供应给热交换器。
此外,可以设置其它实施例使得阀门位于绝热层之外,其中该绝热层用于至少将燃料电池、补燃器和热交换器与环境绝热。该结构的益处是,通过将阀门置于绝热层之外降低了阀门的热压,从而可以使用标准阀门(EGR)。
此外,根据本发明的燃料电池系统可以配置为在热交换器上游的阴极废气线路上设置温度传感器。该温度传感器使得可以通过改变补燃器阳极废气和阴极废气的关系来控制流入热交换器的阳极废气的输入温度。此外,感测的温度用作对阴极废气旁路线路中的阀门的开环控制进行指示的变量。
此外,可将阴极废气线路的结构设计为包围补燃器的覆盖装置,这样降低了补燃器的热压,这是因为通过将阴极废气线路配置为以覆盖装置形式包围补燃器,则该阴极废气线路可以作为外壳用于冷却补燃器,同时补燃器排出的热可以供应给热交换器用于预热阴极进料空气,这样,补燃器需要提供更少的热能,从而可以良好冷却补燃器,尽管热能保留在燃料电池系统中。
此外,根据本发明的燃料电池系统可以配置为在用于向补燃器提供氧化剂的氧化剂进料线路上设置单独可控输送装置,利用该装置可以控制氧化剂供应而与阴极空气进料无关,从而获得对补燃器的良好开环和闭环控制。
根据本发明的机动车辆包括这样的燃料电池系统,因而,在该机动车辆中实现了上述益处。
附图说明
下面,通过举例并参考附图描述本发明的优选实施例,其中:
图1是根据第一示例实施例的燃料电池系统的示意图;以及
图2是根据第二示例实施例的燃料电池系统的示意图。
具体实施方式
现在参照图1,其中示出根据第一示例实施例的燃料电池系统的示意图。安装在机动车辆中的燃料电池系统包括重整装置12,其经由第一燃料线路14从燃料桶16接收燃料供应,还利用第二燃料线路18向重整装置12供应燃料。燃料可以是柴油、汽油、生物气或本领域公知的任何其它燃料类型。此外,重整装置12经由第一氧化剂线路22接收氧化剂供应,如空气。由重整装置12产生的重整产品经由重整产品线路24供应给燃料电池堆26。可选地,对于燃料电池堆26,可以仅提供单个燃料电池。所述重整产品是富氢气体,其在燃料电池堆26中在经由阴极进料空气线路28提供的阴极进料空气(氧化剂)的辅助下发生反应产生电和热。可以经由电接线端30获得产生的电。在所示情况中,经由阳极废气线路32将阳极废气供应给补燃器36的混合器34。补燃器36经由第三燃料线路38从燃料桶16接收燃料供应。此外,补燃器36经由第二氧化剂线路40接收氧化剂供应。在燃料线路14、18和38、氧化剂线路22和40以及阴极进料空气线路28中设置相应的输送装置,例如泵或吹风机和/或对流量进行闭环控制的控制阀。在该结构中,对第二氧化剂线路40的输送装置的闭环控制是与对第一氧化剂线路22的输送装置的闭环控制分开的。在补燃器36中,消耗过的阳极废气与供应的燃料和氧化剂反应成燃烧废气,其中该燃烧废气在混合器42中与经由从燃料电池堆26到混合器42的阴极废气线路44提供的阴极废气进行混合。燃烧废气在最终经由废气出口20离开燃料电池系统之前,流过热交换器46以加热阴极进料空气,其中该燃烧废气几乎没有有害排放物。混合器42和热交换器46之间的部分线路同时也是阴极废气线路和补燃器废气线路的一部分。燃料电池系统,具体地,重整装置12、燃料电池堆26、补燃器36和热交换器46由绝热层10包围,该绝热层10使这些部件和环境绝热。还提供控制器(未示出),用于对燃料和氧化剂供应线路14、18、22、38和40中设置的输送装置进行激活以及对其进行闭环控制。
现在参照图2,其中示出根据第二示例实施例的燃料电池系统的示意图。为了避免繁琐的重复,下面仅讨论和第一实施例的不同之处。在另外示例实施例中所讨论的经由混合器42的阴极废气混合物的一个效果可能是启动系统时的滞后,这是因为,启动时阴极废气还是冷的,即,没有热到足以经由热交换器46预热阴极进料空气。这就是为什么在第二实施例的有益的进一步开发中,在燃料电池堆26和混合器42之间的阴极废气线路44中分支出阴极废气旁路线路48,以转到在热交换器46下游的另一端处的废气出口20。阴极废气旁路线路48具有阀门50,作为一种节流阀,通过该阀门可以控制供应给混合器42的阴极废气流量。在热交换器46的上游,更准确地,阴极废气线路44中的阴极废气旁路线路48的分支的上游,还设置温度传感器52,用于控制阴极废气的温度。可选地,可以将温度传感器52设置在混合器42和热交换器46之间,以便感测进入热交换器46的阳极废气的进口温度。通过评估该温度传感器,电子控制器54能够相应地激活阀门50。系统启动时,阀门充分打开,使得大部分阴极废气经由阴极废气旁路线路48绕过热交换器46,导致热交换器46仅得到或主要得到高温的补燃器废气,以进行快速系统启动,即,快速预热阴极进料空气线路28中的阴极进料空气。一旦系统达到某个工作温度,阴极废气的温度也增加,连续关小阀门50,使得更多的阴极废气供应给混合器42,从而供应给热交换器46,从而实现了回收效果。当以这种方式控制阀门50时,温度传感器52感测的温度作为控制变量。为了降低热压,优选地,在绝热层10外侧设置阀门50,从而使得可以采用标准部件,如汽车废气系统所公知的EGR阀门。在结构上,优选地,阴极废气线路44配置为覆盖补燃器36。例如,可以将阴极废气线路44配置为围绕补燃器36的螺旋管。可选地,阴极废气线路44可以作为双层套管覆盖补燃器36,阴极废气流过其中的空间。
在另一个版本中,阴极废气线路44可以具有可控输送装置,通过该可控输送装置可以对阴极废气流量进行闭环控制。
应该理解,在上述说明书、附图和权利要求中公开的本发明的特征对于通过任何组合来实现本发明都是必须的。
参考标号列表
10 绝热层
12 重整装置
14 第一燃料线路
16 燃料桶
18 第二燃料线路
20 废气出口
22 第一氧化剂线路
24 重整产品线路
26 燃料电池堆
28 阴极进料空气线路
30 电接线端
32 阳极废气线路
34 混合器
36 补燃器
38 第三燃料线路
40 第二氧化剂线路
42 混合器
44 阴极废气线路
46 热交换器
48 阴极废气旁路线路
50 阀门
52 温度传感器
54 电子控制器
Claims (7)
1、一种燃料电池系统,包括:
—燃料电池(26),其在阳极端接收富氢气体供应,并在阴极端接收氧化剂供应,用于在所述燃料电池(26)内反应成阳极废气和阴极废气;
—补燃器(36),其接收所述阳极废气供应;以及
—热交换器(46),其接收所述补燃器废气供应,并利用所述补燃器废气可对供应给所述燃料电池(26)所述阴极端的所述氧化剂进行预热,
其特征在于,经由阴极废气线路(44)可将所述阴极废气供应到在所述补燃器(36)下游的所述热交换器(46)。
2、如权利要求1所述的燃料电池系统,其特征在于,设置阀门(50),利用所述阀门(50)能够全部或部分地分流所述燃料电池(26)和所述热交换器(46)之间的所述阴极废气。
3、如权利要求2所述的燃料电池系统,其特征在于,所述阀门(50)位于绝热层(10)的外侧,其中所述绝热层(10)用于至少将所述燃料电池(26)、所述补燃器(36)和所述热交换器(46)与环境绝热。
4、如前述任意一项权利要求所述的燃料电池系统,其特征在于,在所述热交换器(46)上游的所述阴极废气线路(44)中设置温度传感器(52)。
5、如前述任意一项权利要求所述的燃料电池系统,其特征在于,所述阴极废气线路(44)构造为包围所述补燃器(36)的覆盖装置。
6、如前述任意一项权利要求所述的燃料电池系统,其特征在于,在用于向所述补燃器(36)供应氧化剂的氧化剂进料线路(40)中设置单独可控输送装置。
7、一种机动车辆,包括根据前述任意一项权利要求的燃料电池系统。
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DE102008034674B8 (de) * | 2008-07-25 | 2021-08-26 | Daimler Ag | Verfahren zum Betreiben einer Brennstoffzellenvorrichtung in einer Kaltstartphase sowie Brennstoffzellenvorrichtung |
AT510354B1 (de) * | 2010-08-25 | 2014-06-15 | Vaillant Group Austria Gmbh | Brennstoffzellenanlage |
KR101447335B1 (ko) * | 2012-12-24 | 2014-10-06 | 포스코에너지 주식회사 | 배열을 활용한 스팀터빈 연계 고효율 연료전지 하이브리드 시스템 |
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CA2653413A1 (en) | 2008-01-03 |
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AU2006345057A1 (en) | 2008-01-03 |
EP2033251A1 (de) | 2009-03-11 |
EP2033255A1 (de) | 2009-03-11 |
US20090176137A1 (en) | 2009-07-09 |
AU2007264246A1 (en) | 2008-01-03 |
WO2008000201A1 (de) | 2008-01-03 |
BRPI0621742A2 (pt) | 2011-12-20 |
JP2010512611A (ja) | 2010-04-22 |
EA200870483A1 (ru) | 2009-04-28 |
DE102006029743A1 (de) | 2008-01-03 |
JP2009541952A (ja) | 2009-11-26 |
KR20090005234A (ko) | 2009-01-12 |
CN101479874A (zh) | 2009-07-08 |
US20090155653A1 (en) | 2009-06-18 |
EA200870482A1 (ru) | 2009-04-28 |
WO2008000217A1 (de) | 2008-01-03 |
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