CN1978993A - 利用燃料稳定化装置使液态燃料强催化完全燃烧 - Google Patents
利用燃料稳定化装置使液态燃料强催化完全燃烧 Download PDFInfo
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Abstract
燃料稳定化装置去除液态燃料中的溶解氧,使液态燃料汽化而不产生不希望有的非溶物质和副产物。然后将汽化燃料与氧化剂相混合,并在催化反应室内重整。重整后的汽化燃料可在适度地低的温度下连续地燃烧,并使所排出的有害副产物减少。
Description
技术领域
本发明总的涉及能量转换装置的燃料输送系统,更详细地说,本发明涉及具有用来去除溶解氧以使液态燃料汽化而改善燃烧过程的燃料除氧器的燃料输送系统。
背景技术
燃气涡轮发动机是常用于飞机和发电装置的能量转换装置。燃气涡轮发动机通常具有一个压气机、一个燃烧室和一个涡轮。进入压气机的氧化剂受到压缩,并被导入燃烧室。燃料与高压氧化剂相混合并发生燃烧。在燃烧室中产生的燃气驱动涡轮做功。
燃烧液态燃料的涡轮发动机排出的废气中含有氧化氮(NOx)、一氧化碳(CO)、未燃碳氢化合物(UHC)和其他颗粒物。人们希望降低发动机排出的上述组元的浓度。使用预先混合而成贫混合物的气态燃料例如天然气可显著减少不希望元素的排放物。使液态燃料汽化和预混合也可减少有害的排放物。
但是,加热液态的碳氢化合物燃料使之汽化可导致通常称为“焦化”的产生有害非溶物质的过程,这种焦化物可在燃料系统内部形成结焦沉积,阻塞通道,并降低发动机的总体性能。上述结焦沉积的形成与原先与氧化剂接触的燃料同的溶解氧含量有关。降低燃料内溶解氧的含量可降低结焦沉积速率,并提高加热燃料而不产生结焦沉积的最高允许加热温度。
另外,添加附加的化合物到汽化的燃料中可形成在燃烧室内燃烧而减少上述排放物的贫混合物。在催化反应室内添加氧化剂可形成一种改善燃烧过程的重整燃料。因此,需要发展一种可使液态燃料汽化以改善燃烧过程而不产生讨厌的结焦沉积的工艺和装置。
本发明概述
按照本发明,一种实例的低排放物强催化燃烧装置可去除液态燃料中的溶解氧以使燃料汽化而不产生令人讨厌的非溶物质和副产物。
实例的燃料变换系统可调节燃料以获得最好的燃烧过程,该系统具有一个燃料除氧器、一个热传导装置和一个催化反应室。上述燃料除氧器去除液态碳氢化合物燃料中的溶解氧,使燃料汽化时没有不利影响也不会产生过量的非溶物质。然后将汽化的燃料与氧化剂混合,并在催化反应中重整,重整后的燃料与更多的氧化剂混合可保证在低温下持续燃烧并减少有害副产物的排出量。液态燃料的汽化由于改善了燃料与氧化剂的混合而改善燃烧过程。这又改善了火焰稳定性并提供更完全而且有效的燃烧。
因此,本发明的燃料变换系统和方法由于提供液态燃料的汽化又不产生不希望有的副产物而改善了燃烧过程。
从下面的说明书和简要说明的附图可清楚地了解本发明的上述的和其他的特征。
附图简述
图1简单示出具有本发明的燃料稳定化装置的发动机系统实例。
图2简单示出另一个具有本发明的燃料稳定化装置的发动机系统实例。
图3是按照本发明准备燃烧用的燃料的方法步骤方框图。
图4是按照本发明的一个可渗透膜件的实例的简单剖视图。
优选实施例的详细说明
参看图1,图中简单示出按照本发明的燃气涡轮发动机10的实例,它具有一个调节燃料以获得最佳燃烧过程的燃料变换系统26。可以理解,虽然本文作为说明实例只谈到燃气涡轮发动机,但是,其他的燃烧工艺方法和装置例如活塞式发动机、蒸汽发动机和其他公知的能量转换装置也可从本发明获益。
燃气涡轮发动机10具有一个压缩进入的空气的压气机14、一个燃烧燃料/氧化剂混合物的燃烧室18和一个根据燃烧室18产生的排出燃气流15而运转的涡轮16。
本发明的燃气涡轮发动机10具有一个燃料变换系统26,该系统26具有一个燃料除氧器20、一个热传导装置22和一个催化反应室24。碳氢化合物燃料由于在运输和贮存过程中与氧化剂接触而通常含有溶解的氧。燃料内的溶解氧会在高温下与燃料内的其他化合物相结合,所引起的相互反应会产生出令人讨厌的通常称为“结焦”的非溶物质。由于上述相互反应而积集的非溶物质可堆积在燃料变换系统26和燃烧室18的内壁上,造成不希望有的性能下降。
从碳氢化合物燃料中去除溶解氧可提高上述非溶物质开始明显形成的温度,而且减少所产生的非溶物质的量。除氧器20可去除燃料中的溶解氧,而不会显著影响燃料性质。
在许多的燃烧工艺过程中,燃料/氧化剂混合物是发动机效率和排放物浓度的一个重要因素。含有燃料浓度大于按化学计算的混合物中的浓度的混合物称为富混合物,并可燃烧而且保持在比按化学计算的燃烧温度低的燃烧温度。含有氧化剂的浓度大于按化学计算的混合物中的浓度的混合物称为贫混合物,其工作温度比按化学计算的燃烧温度低。在某些用途中最好使燃烧室在较低的温度下工作,以使产生的氧化氮的浓度较低,并可避免保持高温燃烧所需要的控热装置和构件。但是,燃烧温度太低会使产生的排放物中含有浓度不合适的副产物例如一氧化碳和未燃的碳氢化合物和各种其他的有害物质。在适当地低的温度下燃烧贫混合物不会产生高浓度的NOx、CO和UHC。但是,这种贫混合物目前仅在气态燃料条件下可用,而采用通常的液态碳氢化合物燃料的情况下是不可行的。
本发明的燃料变换系统26去除从燃料供应源25供应的液态碳氢化合物燃料中的溶解氧,使燃料汽化,而没有显著的不利影响,并且不会产生过量的非溶物质。汽化的燃料在预混室29中与氧化剂21相混合,形成富混合物,并在催化反应室24中重整,上述反应室24需要如图1中箭头23所示的冷却以保持其工作寿命。上述所形成的汽化燃料可保证在催化反应室24进行减少NOx产生的低温反应。由于改善了氧化剂与燃料的混合又改善了催化反应室24中的反应而使液态燃料的汽化改善了发动机的燃烧过程。然后,在燃料变换系统26变换过的燃料在后混合室28内与适量的氧化剂19相混合,而变成一种贫混合物,并在燃烧室稳定地燃烧而产生最少的NOx、CO和UHC。可以通过部分的或全部的冷却流23部分地或全部地供给氧化剂19。
参看图2,图中示出燃气涡轮发动机10和燃料变换系统26的另一个实例,其中,一部分燃料流过燃料变换系统26的旁路管道27直接注入后混合室28或燃烧室18。如人们所知,仅仅一部分燃料流过燃料变换系统26便可显著地改善燃料的调节。燃料变换系统26的每一个组成部分都具有压力降,或者说影响燃料流的其他参数。若使流过燃料变换系统26的燃料量与流过旁路管道27的燃料量相平衡便提供了一种修整燃料流的特征以改善燃烧过程的方法。例如在燃烧室18内添加液态燃料可提高火焰的稳定性。另外,图2示出旁路管道27通过管道29将燃料供入后混合室28,并可通过管道31直接供入燃烧室18。其中一条或两条管道都可用来提供所需的燃料流的性质,以达到所需的燃烧效能。此外,还可将来自燃料供应源25的液态燃料直接通过管道33注入催化反应室24。因此,一部分的液态燃料可通到系统26中的任一个或全部的组成部分20、22、29和24的周围,以获得理想的燃烧性能和所需的对进入燃烧室18的燃料的调节。
请参看图3,该图是准备燃烧用的燃料的方法步骤的方框图。在步骤30,燃料变换系统26工作,首先去除大量来自液态碳氢化合物燃料流内的溶解氧,该溶解氧是在除氧器20内去除的。从燃料中去除的溶解氧的量要使得燃料的汽化不会造成明显的不希望有的过量的结焦或其他非溶物质的产生。在某些用途中,可能要求去除氧的量使燃料中的溶解氧含量仅为0.1ppm(百万分之0.1)。另外一些用途可以在较高的氧浓度下满意地工作。
请看图4,除氧器20具有一个液态燃料在其上面流动的氧可渗透膜件60,跨越该膜件60的氧分压差将溶解氧从液态燃料中抽出。上述氧透过可渗透膜件60而迁移,并被排至除氧器20外。上述的可渗透膜件60由施加在一种多孔性底板64上的可渗透层62构成。
可渗透膜件60支承在多孔性衬底66上。真空源70造成跨越可渗透膜件60的氧分压差,致使溶解氧68被连续不断地从燃料25中抽出。抽出的溶解氧被排到水中,或排到其他的可利用它的装置中。虽然这里只谈到可渗透膜件作为实例,但是,应当明白,其他的可从燃料中去除氧的普通机构或其他的能使液态燃料汽化但不出现明显的结焦的方法都在本发明的思考范围内。
再参看图3,从除氧器20排出的液态燃料流入热传导装置22中,并被汽化(步骤32)。由于此时燃料基本上没有溶解氧、故燃料加热或汽化不会造成过量的非溶物质的形成。然后,汽化的燃料与氧化剂相混合,以助重整(步骤36)。重整的产品通常含有H2,CO,H2O,和CO2。也可将汽化燃料与其他的有助于燃烧过程的氧化剂、元素和化合物相混合,这也在本发明的思考范围之内。
然后将汽化的燃料在催化反应室24内重整(步骤36)。催化反应室24内含有可在待燃燃料内引起有利反应的材料。在催化反应室24内重整的产物排出来并与附加的氧化剂相混合。(步骤38)。然后将该燃料/氧化剂混合物喷入燃烧室18进行燃烧(步骤40)。
虽然上面说明了本发明的优选实施例,但是,本技术领域内的普通工作人员会认识到在本发明范围内可进行一些改型。为此,应当研究下面的权利要求书以确定本发明的实际范围和内容。
Claims (18)
1.一种操作燃料变换系统为燃烧装置制备液态燃料的方法,包含如下步骤:
a)用一种除氧器在第一温度下除去液态燃料中的溶解氧;
b)将该液态燃料加热到高于上述该第一温度的第二温度使至少一部分燃料汽化;
c)将该汽化燃料与一种氧化剂混合;和
d)在一种催化反应室内重整该汽化的燃料氧化剂混合物。
2.根据权利要求1的方法,其特征在于,还包含如下步骤:该汽化燃料在催化反应室内被重整后再与附加的氧化剂混合。
3.根据权利要求1的方法,其特征在于,上述的步骤a)包含使液态燃料靠近一种氧可渗透膜件流动,并造成跨越上述可渗透膜件的氧分压差从而从该液态燃料中抽出溶解氧。
4.根据权利要求1的方法,其特征在于,所述第一温度低于生成由该燃料和该溶解氧之间相互反应而产生明显的非溶物质的温度。
5.根据权利要求1的方法,其特征在于,上述的第二温度高于生成由该燃料与该溶解氧之间相互反应而产生明显的非溶物质的温度。
6.根据权利要求1的方法,其特征在于,还包含如下步骤:在燃烧室内在适度低的温度下燃烧上述的汽化燃料一氧化剂混合物。
7.根据权利要求6的方法,其特征在于,上述的适度低的温度包括在2000~3000之间的温度。
8.根据权利要求1的方法,其特征在于,包括使一部分液态燃料环绕该燃料变换系统旁路流动,而另一部分液态燃料流过该燃料变换系统。
9.根据权利要求8的方法,其特征在于,上述的环绕该燃料变换系统旁路流动的那部分液态燃料直接进入该燃烧装置。
10.根据权利要求8的方法,其特征在于,上述环绕该燃料变换系统旁路流动的那部分液态燃料直接进入一后混合室。
11.一种用于调节供燃烧装置用的液态燃料的系统,该系统具有:
至少一个用于从液态燃料中去除溶解氧的燃料除氧器;
一个使至少一部分液态燃料汽化的加热装置;
一个用于添加氧化剂到汽化燃料中去的混合装置;和
一个用于重整与该氧化剂混合后的燃料的催化反应室。
12.根据权利要求11的系统,其特征在于,还包括一个用来在上述催化反应室内重整后添加附加的氧化剂的第二混合装置。
13.根据权利要求11的系统,其特征在于,上述的燃料除氧器在低于生成不希望有的非溶物质结构的温度的第一温度下接受液态燃料。
14.根据权利要求13的系统,其特征在于,上述的加热装置将燃料加热到高于上述第一温度的第二温度。
15.根据权利要求11的系统,其特征在于,上述的液态燃料流过上述的除氧器,并贴近氧可渗透膜件。
16.根据权利要求15的系统,其特征在于,包括跨越上述的氧渗透膜件的氧压差,以便从贴近上述可渗透膜件流动的燃料中抽出溶解氧。
17.根据权利要求11的系统,其特征在于,上述的燃料装置包括燃气涡轮发动机的燃烧室。
18.根据权利要求11的系统,其特征在于,还包括一条通到环绕上述燃料除氧化器、加热装置、混合装置和催化反应室中的至少一个的部分燃料的旁路管道。
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US11/297177 | 2005-12-08 | ||
US11/297,177 US20070130956A1 (en) | 2005-12-08 | 2005-12-08 | Rich catalytic clean burn for liquid fuel with fuel stabilization unit |
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EP (1) | EP1795805A3 (zh) |
JP (1) | JP2007154891A (zh) |
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Cited By (4)
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CN103422993A (zh) * | 2012-05-17 | 2013-12-04 | 通用电气公司 | 用于产生富氢燃料的系统和方法 |
CN104100997A (zh) * | 2013-04-08 | 2014-10-15 | 通用电气公司 | 催化燃烧空气加热系统 |
CN111677602A (zh) * | 2020-05-14 | 2020-09-18 | 天津大学 | 一种预防热氧化结焦问题的车载废气柴油重整器 |
CN111677602B (zh) * | 2020-05-14 | 2021-11-02 | 天津大学 | 一种预防热氧化结焦问题的车载废气柴油重整器 |
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EP1795805A3 (en) | 2010-07-07 |
US20070130956A1 (en) | 2007-06-14 |
KR20070061325A (ko) | 2007-06-13 |
CA2558165A1 (en) | 2007-06-08 |
JP2007154891A (ja) | 2007-06-21 |
EP1795805A2 (en) | 2007-06-13 |
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