CN101806247B - 通过性能加热优化燃用低btu燃料的联合循环发电设备 - Google Patents
通过性能加热优化燃用低btu燃料的联合循环发电设备 Download PDFInfo
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Abstract
本发明涉及通过性能加热优化燃用低BTU燃料的联合循环发电设备。公开了一种使用来自联合循环发电设备(200)中的燃气轮机压缩机(240)的压缩空气流排放物以及性能加热来提高设备性能的优化措施。在一个实施例中,对副产物废气的转向的部分和压缩空气流排放物进行燃烧加热,以产生高温烟气(285),在燃料的加压混合物被供应至燃气轮机燃烧器(245)之前,使用该高温烟气(285)对该燃料的加压混合物进行性能加热。
Description
技术领域
本发明大体涉及燃用低BTU燃料的联合循环发电设备,且更特别地讲,涉及通过对燃料进行性能加热(performance heating)来优化供应给燃气轮机的燃料以及提高联合循环发电设备中的效率和功率输出。背景技术
燃用低BTU燃料的联合循环发电设备是这样一种类型的联合循环发电设备:已经实施这种联合循环发电设备,以便与传统的锅炉发电设备相比提供更高的效率及更低的排放。低-BTU气体,诸如鼓风炉气体(BFG)和焦炉气(COG),通常在炼钢厂中生产生铁期间作为焦炭燃烧以及鼓风炉中的铁矿石熔体的副产物而产生。在发电设备现场中,回收低BTU气体,并将其用作燃气轮机联合循环发电解决方案中的燃料,燃气轮机联合循环发电解决方案可产生用于炼钢厂以及出售给公共电网两者的电能。发明内容
在本发明的一方面,提供了一种基于低BTU燃料的联合循环发电设备。该联合循环发电设备包括混合副产物废气的气体混合单元。联接到气体混合单元上的燃料气体压缩机对副产物废气的混合物加压。燃气轮机由来自燃料气体压缩机的副产物废气的加压混合物供以燃料。燃气轮机包括:压缩机;燃烧器,该燃烧器接收来自压缩机的空气以及来自燃料气体压缩机的副产物废气的加压混合物,以使它们燃烧;以及涡轮,该涡轮使由来自压缩机的空气和来自燃料气体压缩机的副产物废气的加压混合物的燃烧所产生的热气体膨胀。该联合 循环发电设备进一步包括燃烧加热(fired heating)单元,该燃烧加热单元接收副产物废气的转向的部分和来自燃气轮机压缩机的压缩空气流排放物,以使它们进行燃烧。副产物废气的转向的部分和压缩空气流排放物在燃烧加热单元中的燃烧产生高温烟气。联合循环发电设备还包括性能加热单元,在来自燃料气体压缩机的副产物废气的加压混合物进入燃气轮机燃烧器之前,该性能加热单元利用由燃烧加热单元产生的高温烟气来加热该来自燃料气体压缩机的副产物废气的加压混合物。
在本发明的另一方面,提供了一种燃用鼓风炉气体的联合循环发电设备。在本发明的该方面中,鼓风炉气体联合循环发电设备包括混合鼓风炉气体与焦炉气的气体混合单元。联接到气体混合单元上的燃料气体压缩机对鼓风炉气体和焦炉气的混合物加压。燃气轮机由来自燃料气体压缩机的鼓风炉气体与焦炉气的加压混合物供以燃料。燃气轮机包括:压缩机;燃烧器,其接收来自压缩机的空气和来自燃料气体压缩机的鼓风炉气体与焦炉气的加压混合物,以使它们进行燃烧;以及涡轮,涡轮使由来自压缩机的空气和来自燃料气体压缩机的鼓风炉气体与焦炉气的加压混合物的燃烧所产生的热气体膨胀。鼓风炉气体联合循环发电设备进一步包括燃烧加热单元,该燃烧加热单元接收鼓风炉气体的转向的部分和来自燃气轮机压缩机的压缩空气流排放物,以使它们进行燃烧。鼓风炉气体的转向的部分和压缩空气流排放物在燃烧加热单元中的燃烧产生高温烟气。鼓风炉气体联合循环发电设备还包括性能加热单元,在来自燃料气体压缩机的鼓风炉气体和焦炉气的加压混合物进入燃气轮机燃烧器之前,性能加热单元利用由燃烧加热单元所产生的高温烟气加热该来自燃料气体压缩机的鼓风炉气体和焦炉气的加压混合物。
在本发明的第三方面中,存在一种提高在鼓风炉气体联合循环发电设备中使用的低-BTU燃料的温度的方法。在本发明的该方面中,该方法包括:使鼓风炉气体与焦炉气混合;对鼓风炉气体和焦 炉气的混合物加压;对鼓风炉气体的转向的部分和来自燃气轮机压缩机的压缩空气流排放物进行燃烧加热,以使它们燃烧;以及在供应至燃气轮机燃烧器之前,利用由鼓风炉气体的转向的部分和压缩空气流排放物燃烧而产生的高温烟气对鼓风炉气体和焦炉气的加压混合物进行性能加热。附图说明
图1是传统的燃用BFG的联合循环发电设备的示意图;以及
图2是根据本发明的一个实施例的燃用BFG的联合循环发电设备的示意图。具体实施方式
参看附图,图1显示了传统的燃用BFG的联合循环发电设备100的示意图。如图1中所示,包括BFG和COG的副产物废气从炼钢厂110被供应到气体混合单元105。虽然图1中未示出,但可将从炼钢厂110排放的其它副产物废气(诸如Linz Donawitz气体(LDG)和COREX气体)用作低-BTU燃料。通常,供应至气体混合单元105的BFG的量远远多于COG的量。例如,混合单元105可从炼钢厂110接收大约250pps的BFG和大约10pps的COG。自炼钢厂110供应的BFG和COG两者的量通常处于低压,且因此由气体混合单元105产生的BFG和COG的混合物大体处于大约15.5psia的低压。该气体混合物需要被提高到较高的压力,以便用作用于燃气轮机燃烧器的燃料。
燃用BFG的联合循环发电设备100使用离心燃料气体压缩机115来将BFG和COG的气体混合物的压力提高到大约300psia。如图1中所示,燃料气体压缩机115是多级燃料气体压缩机,其在该实施例中包括第一燃料气体压缩机(FGC1)120和第二燃料气体压缩机 (FGC2)125。中间冷却单元130位于FGC1 120和FGC2 125之间,以便提高燃料气体压缩机115的效率。
燃料气体压缩机115将BFG和COG的该气体混合物供应给燃气轮机135。燃气轮机包括:压缩机140,其从入口导叶(IGV)抽取空气;燃烧器145,其接收来自压缩机140的压缩空气和来自燃料气体压缩机115的副产物废气的加压混合物,以使它们燃烧;以及涡轮150,其使由来自压缩机140的空气与来自燃料气体压缩机115的副产物废气的加压混合物燃烧而产生的热气体膨胀。如图1中所示,从压缩机140中排出压缩空气流排放物,其由参考元素155表示。供应压缩空气流排放物,以便与由涡轮150产生的排气产物(其由参考元素160表示)混合。压缩空气流的从压缩机140到涡轮150的排气的这种排放物被称为压缩机向外排放物(over-board bleed)(OBB),且完成其以防止压缩机140中的喘振。
热回收蒸汽发生器(HRSG)165接收来自涡轮150的排气产物,以便从该排气产物中回收废热。从排气产物回收的热被传递到HRSG 165中的废物/蒸汽中,以便产生被供应给蒸汽轮机(未示出)以驱动发电机(未示出)的蒸汽。来自HRSG165的冷却气体通过烟囱被排出到大气中。本领域技术人员将认识到,BFG联合循环发电设备100的该部分可具有其它构件(例如冷凝器,水管等),但为了便于示意本发明的实施例而将其省略。类似地,本领域技术人员将认识到,燃用BFG的联合循环发电设备100的与燃气轮机135相关的部分可具有未显示的其它构件(例如燃气轮机发电机),但为了便于示意本发明的实施例而省略了这些构件。
如本文所确定的,存在一些与燃用BFG的联合循环发电设备100的运行相关联的缺点。例如,因为BFG和COG的气体混合物具有低LHV,所以需要极大量的燃料在燃气轮机135的燃烧器145中获得燃烧温度。需要大量燃料的结果是燃料气体压缩机115将必须压缩更多的这种低LHV燃料。结果,燃料气体压缩机115有大量的功 率消耗,这会降低联合循环净输出。与燃用BFG的联合循环发电设备100的运行相关联的另一个缺点是利用OBB的方式。特别地,此处已发现将OBB从压缩机140排到涡轮150的排气160会降低联合循环发电设备100的总体效率。
图2是已经优化了以上所提到的缺点以便提高效率和功率输出的燃用BFG的联合循环发电设备200的示意图。图2中的与图1中所使用的构件类似的构件被赋予了相似的参考元素,只是图2中所使用的参考元素前面加了标号2。类似于图1,图2仅显示了燃用BFG的联合循环发电设备200的、阐述其运行和涉及其优化的本文所述的实施例所必须的部分。
如图2中所示,BFG气体分流器270在来自炼钢厂210的BFG于气体混合单元205中与COG混合之前使该BFG的一部分转向。在一个实施例中,BFG气体分流器270使具有大约15.5psia的压力以及大约104℉(40℃)的温度的大约21.5pps的BFG转向。BFG的转向的部分由参考元素275表示。
燃烧加热单元280接收BFG的转向的部分和从压缩机240排出的OBB255,以使它们燃烧。燃烧加热单元280产生由参考元素285表示的高温烟气。性能加热单元290使用高温烟气285来加热由燃料气体压缩机215所产生的BFG和COG的加压混合物,之后该混合物才进入燃气轮机255的燃烧器245。在一个实施例中,性能加热单元290是在将BFG和COG的加压混合物供应至燃烧器245之前使BFG和COG的加压混合物的温度升高大约250℉(121℃)的热交换器。来自性能加热单元295的排气295与来自燃气轮机255的涡轮250的排气260混合。虽然在一个实施例中,排气295与来自涡轮250的排气260在HRSG入口之前混合,但本领域技术人员将认识到,可将排气295供应至HRSG 265的其它中间位置而不与排气260混合。
如本文中所示,图2的效率和功率输出已得到提高,因为性能加热单元290利用来自燃烧加热单元280的高温烟气285预加热了BFG和COG的加压混合物。该特征表示需要较少的燃料通过燃料气体压缩机215来在燃气轮机255的燃烧器245中获得燃烧温度。结果,减少了燃料气体压缩机215的功率消耗,这会转化成燃用BFG的联合循环发电设备200的净输出和净效率的提高。同样,因为降低了燃料气体压缩机215的燃料流要求,所以在压缩机240处喘振边界有所放宽,这会转化成排出较少的OBB(即,减少大约30%)。结果,该特征还有助于提高燃用BFG的联合循环发电设备200的总体效率。因此,实施本文所包括的构思将提供大约+1.44MW的净联合循环输出增长和大约+0.37%的效率增长。
虽然已特别地显示了且结合本公开的优选实施例描述了本公开,但将了解的是,本领域技术人员将会想到变型和修改。因此,将理解的是,所附的权利要求书意图覆盖落在本公开的实际精神内的所有这样的修改和改变。
Claims (10)
1.一种基于低BTU燃料的联合循环发电设备,包括:
混合副产物废气的气体混合单元,其中,所述副产物废气包括鼓风炉气体和焦炉气;
联接到所述气体混合单元上、对副产物废气的混合物加压的燃料气体压缩机;
由来自所述燃料气体压缩机的副产物废气的加压混合物供以燃料的燃气轮机,所述燃气轮机包括:压缩机;燃烧器,所述燃烧器接收来自所述压缩机的空气以及来自所述燃料气体压缩机的副产物废气的加压混合物,以使该空气和该加压混合物燃烧;以及涡轮,所述涡轮使得由来自所述压缩机的空气和来自所述燃料气体压缩机的所述副产物废气的加压混合物的燃烧所产生的热气体膨胀;
燃烧加热单元,所述燃烧加热单元接收所述副产物废气的转向的部分和来自所述燃气轮机压缩机的压缩空气流排放物,以使该转向的部分和该排放物燃烧,其中由所述燃烧加热单元接收的所述副产物废气的转向的部分包括所述鼓风炉气体的一部分,所述副产物废气的转向的部分和所述压缩空气流排放物在所述燃烧加热单元中的燃烧产生高温烟气;以及
性能加热单元,在来自所述燃料气体压缩机的所述副产物废气的加压混合物进入所述燃气轮机燃烧器之前,所述性能加热单元利用由所述燃烧加热单元所产生的所述高温烟气来加热该来自所述燃料气体压缩机的所述副产物废气的加压混合物,其中,来自所述性能加热单元的排气与来自所述燃气轮机的排气混合。
2.根据权利要求1所述的联合循环发电设备,其特征在于,所述燃料气体压缩机包括多级燃料气体压缩机,其中至少一个中间冷却单元位于各级之间。
3.根据权利要求1所述的联合循环发电设备,其特征在于,所述性能加热单元包括热交换器。
4.根据权利要求1所述的联合循环发电设备,其特征在于,进一步包括接收来自所述燃气轮机的排气的热回收蒸汽发生器。
5.一种燃用鼓风炉气体的联合循环发电设备,包括:
使鼓风炉气体与焦炉气混合的气体混合单元;
联接到所述气体混合单元上、对所述鼓风炉气体和焦炉气的混合物加压的燃料气体压缩机;
由来自所述燃料气体压缩机的所述鼓风炉气体和焦炉气的加压混合物供以燃料的燃气轮机,所述燃气轮机包括:压缩机;燃烧器,所述燃烧器接收来自所述压缩机的空气和来自所述燃料气体压缩机的所述鼓风炉气体和焦炉气的加压混合物,以使该空气和该加压混合物燃烧;以及涡轮,所述涡轮使由来自所述压缩机的空气与来自所述燃料气体压缩机的所述鼓风炉气体和焦炉气的加压混合物的燃烧所产生的热气体膨胀;
燃烧加热单元,所述燃烧加热单元接收所述鼓风炉气体的转向的部分以及来自所述燃气轮机压缩机的压缩空气流排放物,以使该转向的部分和该排放物燃烧,所述鼓风炉气体的转向的部分和所述压缩空气流排放物在所述燃烧加热单元中的燃烧产生高温烟气;以及
性能加热单元,在来自所述燃料气体压缩机的所述鼓风炉气体和焦炉气的加压混合物进入所述燃气轮机燃烧器之前,所述性能加热单元利用由所述燃烧加热单元所产生的所述高温烟气来加热来自所述燃料气体压缩机的所述鼓风炉气体和焦炉气的加压混合物,其中,来自所述性能加热单元的排气与来自所述燃气轮机的排气混合。
6.根据权利要求5所述的鼓风炉气体联合循环发电设备,其特征在于,所述燃料气体压缩机包括多级燃料气体压缩机,其中至少一个中间冷却单元位于各级之间。
7.根据权利要求5所述的鼓风炉气体联合循环发电设备,其特征在于,所述性能加热单元包括热交换器。
8.根据权利要求5所述的鼓风炉气体联合循环发电设备,其特征在于,所述鼓风炉气体联合循环发电设备进一步包括接收来自所述燃气轮机的排气的热回收蒸汽发生器。
9.一种提高在鼓风炉气体联合循环发电设备中所使用的低-BTU燃料的温度的方法,包括:
混合鼓风炉气体和焦炉气;
对所述鼓风炉气体和焦炉气的混合物加压;
对所述鼓风炉气体的转向的部分和来自燃气轮机压缩机的压缩空气流排放物进行燃烧加热,以使该转向的部分和该排放物燃烧;以及
在将所述鼓风炉气体和焦炉气的加压混合物供应到燃气轮机燃烧器之前,利用由所述鼓风炉气体的转向的部分和所述压缩空气流排放物的燃烧所产生的高温烟气对所述鼓风炉气体和焦炉气的加压混合物进行性能加热,以及使来自所述性能加热的排气与来自所述燃气轮机的排气混合。
10.根据权利要求9所述的方法,其特征在于,所述方法进一步包括将来自燃气轮机的排气供应至热回收蒸汽发生器。
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US12/369,180 US8117821B2 (en) | 2009-02-11 | 2009-02-11 | Optimization of low-BTU fuel-fired combined-cycle power plant by performance heating |
US12/369180 | 2009-02-11 |
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