CN101981272B - 低排放发电和烃采收系统及方法 - Google Patents
低排放发电和烃采收系统及方法 Download PDFInfo
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Abstract
提供了在烃采收方法中低排放发电的方法和系统。一个系统包括低排放发电的集成的压力保持和混相驱动系统。可选的系统提供了使用热气体膨胀器和外部燃烧器的低排放发电、碳分离、提高采收率法采油(EOR)或二氧化碳出售。另一可选的系统提供了使用气体发电轮机以在入口压缩机中压缩空气并使用膨胀器内的热二氧化碳充载气体发电的低排放发电。通过合并热交叉交换、脱盐设备、共生产和其它特征可以获得其它功效。
Description
交叉引用相关申请
本申请要求2008年3月28日提交的美国临时申请号61/072,292和2009年2月18日提交的美国临时申请号61/153,508的权益。
发明领域
本发明的实施方式涉及烃采收方法中的低排放发电。更具体而言,本发明的实施方式涉及利用氮、氧、二氧化碳和烃燃料在极低排放的烃采收方法中发电的方法和装置。
发明背景
本节意图介绍与本发明的示例性实施方式相关的本领域的各个方面。相信该讨论有助于提供一个基本概念,以利于更好地理解本发明的特定方面。因此,应该理解,本节应该基于此进行阅读,并不必承认其为现有技术。
多种强化烃采收操作可以被分类为以下类型之一:压力保持和混相驱动(miscible flooding)。在压力保持操作中,惰性气体如氮被注入主要为气态的油藏,以在该油藏内至少保持最低压力,阻止反凝析并提高总采收量。在混相驱动操作中,混相气体如二氧化碳被注入主要为液态的油藏以与液体混合,降低其粘度并增加压力以提高采收率。
许多产油国正在经历强烈的国内电力需求增长,并关注于提高采收率法采油(EOR),以提高从其油藏采油。两种常见的EOR技术包括用于油藏压力保持的氮气(N2)注入和用于EOR混相驱动的二氧化碳(CO2)注入。还有全球关注的温室气体(GHG)排放问题。这种关注与许多国家的总量控制与交易政策(cap-and-trade)的执行相结合,使得减少CO2排放成为这些和其它国家以及其中操作烃生产系统的公司优先考虑的事情。
减少CO2排放的一些方法包括燃料脱碳或燃烧后捕集。但是,这两种方法成本都高并且降低发电效率,导致电力生产量降低,为满足国内电力需求而增加了燃料的需求并增加了电的成本。另一种方法是联合循环方式(in a combined cycle)的含氧燃料燃气轮机(例如,来自燃气轮机Brayton循环的废热被捕集以在Rankin循环中产生蒸汽并产生额外电力)。然而,没有商业可得的燃气轮机能够在这样的循环内进行操作,并且产生高纯氧所需的电力显著降低了该方法的总效率。一些研究比较了这些方法并显示了每种方法的一些优势。参见例如BOLLAND、OLAV和UNDRUM,HENRIETTE,Removal of CO2 fromGas Turbine Power Plants:Evaluation of pre-and post-combustionmethods,SINTEF Group,参见http://www.energy.sintef.no/publ/xergi/98/3/3art-8-engelsk.htm(1998)。
美国专利号4,344,486(′486专利)公开了一种方法,所述方法是向采出的烃和来自产液地层的二氧化碳中添加基本纯的氧以产生热或电,并再次注入二氧化碳用于EOR。所述′486专利公开,将烃液体与产液地层的采出液流中的气态组分分离,然后将所述气态组分与基本纯的氧混合并燃烧所述混合物以产生热和CO2。然后CO2被注入相同或不同的产液地层。该方法没有教导或建议解决制氧厂效率低下(efficiency drag)问题的方案。
美国专利公开号2007/0237696(′696出版物)基本上公开了含氧燃料方法和′486专利中公开的EOR的组合。′696出版物也要求独立的制氧厂或空气分离厂,没有教导或建议工作气体发电轮机配置。
因此,仍然十分需要低排放、高效率的烃采收方法。
发明概述
本发明的一个实施方式公开了集成系统。所述集成系统包括空气分离机构其被配置为产生高纯氧流和高纯氮流;气态控制燃料流;燃烧机构,其被配置为使至少所述气态控制燃料流和所述高纯氧流燃烧以产生含二氧化碳和水的气态燃烧流;发电系统,其被配置为接收所述含二氧化碳和水的气态燃烧流并至少产生压缩的、气态的、基本为二氧化碳的流;第一注入器机构,其被配置为将所述压缩的、气态的、基本为二氧化碳的流的至少一部分注入提高采收率法采油油藏;和第二注入器机构,其被配置为将所述高纯氮流的至少一部分注入压力保持油藏。在一个实施方式中,所述发电系统包括膨胀器,其被配置为接收所述气态燃烧流并产生至少一个单位的机械能和气态排出流;热回收机构,其被配置为接收并冷却所述气态排出流,产生至少一个单位的热能,并生成至少一体积的水和冷却的、气态的、基本上为二氧化碳的流,其中所述热能被任选地用于产生蒸汽以产生蒸汽能;和二氧化碳压缩机,其被配置为压缩所述冷却的、气态的、基本上为二氧化碳的流以产生所述压缩的、气态的、基本为二氧化碳的流。所述系统还可以包括第一烃采收油藏,其被配置为产生第一烃混合物;和第一烃分离机构,其被配置为至少将液体烃从所述第一烃混合物中分离出来并产生第一烃流和包括二氧化碳的第二气体流,其中所述燃烧机构被进一步配置为利用所述第二气体流的至少一部分与所述气态控制燃料流和所述高纯氧流,产生所述含二氧化碳和水的气态燃烧流。所述系统可以进一步包括第二烃采收油藏,其被配置为产生第二烃混合物;和第二烃分离机构,其被配置为至少将液体烃从所述第二烃混合物中分离出来并产生第二烃流和包括氮气的惰性气体流,其中所述第二注入器进一步被配置以将所述惰性气体流注入所述压力保持油藏。
本发明的另一实施方式公开了改进的烃采收方法。所述方法包括将空气分离成高纯氧流和高纯氮流;提供气态控制燃料流;在燃烧器内燃烧至少所述气态控制燃料流和所述高纯氧流以形成含二氧化碳和水的气态燃烧流;将所述含二氧化碳和水的气态燃烧流接收入发电系统,其中所述发电系统至少产生压缩的、气态的、基本上为二氧化碳的流;将所述压缩的、气态的、基本上为二氧化碳的流的至少一部分注入提高采收率法采油油藏;以及将所述高纯氮流的至少一部分注入压力保持油藏。
在本发明的第三个实施方式中,公开了低排放发电系统。所述系统包括第一烃采收油藏,其被配置为产生第一烃混合物;第一烃分离机构,其被配置为至少将液体烃从所述第一烃混合物中分离出来并产生第一烃流和包括二氧化碳的第二气体流;气态控制燃料流;高纯氧流;外部燃烧器,其被配置为使所述气态控制燃料流、所述高纯氧流和所述包含二氧化碳的第二气体流的组合燃烧,以产生气态燃烧流;热气体膨胀器,其被配置为接收所述气态燃烧流并产生至少一个单位的机械能和至少具有二氧化碳组分和水组分的气态排出流;和操作系统,其被配置为调节所述气态排出流以从中充分地除去所述水组分并利用所述二氧化碳组分的至少一部分。
在本发明的第四个实施方式中,提供了低排放发电的方法。所述方法包括从第一烃采收油藏产生第一烃混合物;将所述第一烃混合物分离为第一烃流和包括二氧化碳的第二气体流;提供高纯氧流;提供气态控制燃料流;在外部燃烧器内使至少所述高纯氧流和所述气态控制燃料流的组合燃烧,以产生含二氧化碳和水的气态燃烧流;使所述气态燃烧流在热气体膨胀器内膨胀以产生至少一个单位的机械能和具有水组分和二氧化碳组分的气态排出流;从所述气态排出流中除去所述水组分的至少一部分;和利用所述排出(尾气)流的二氧化碳组分的至少一部分。
在本发明的第五个实施方式中,公开了低排放发电系统。所述系统包括第一烃采收油藏,其被配置为产生第一烃混合物;第一烃分离机构,其被配置为至少将液体烃从所述液体烃混合物中分离出来并产生第一烃流和包括二氧化碳的第二气体流;气态控制燃料流;空气分离机构,其被配置为至少提供高纯氧流;燃烧器,其被配置为使所述气态控制燃料流、所述高纯氧流和包含二氧化碳的所述第二气体流的组合燃烧以产生气态燃烧流;和气体发电轮机。所述气体发电轮机包括:入口压缩机,其中所述入口压缩机被配置为压缩大气以送至所述空气分离机构;和膨胀器,其被配置为接收所述气态燃烧流并产生至少一个单位的机械能和至少具有二氧化碳组分和水组分的气态排出流。所述发电系统进一步包括操作系统,其被配置为调节所述气态排出流以充分地除去所述气态排出流的水组分并利用所述气态排出流的二氧化碳组分的至少一部分。
在本发明的第六个实施方式中,提供了低排放发电的方法。所述方法包括从第一烃采收油藏产生第一烃混合物;将所述第一烃混合物分离为第一烃流和包括二氧化碳的第二气体流;在空气分离机构内分离空气,所述空气分离机构被配置以至少产生高纯氧流;提供气态控制燃料流;在燃烧器内使至少所述高纯氧流和所述气态控制燃料流的组合燃烧,以产生含二氧化碳和水的气态燃烧流;在气体发电轮机的入口压缩机内压缩空气以形成压缩的空气流;将所述压缩的空气流提供至所述空气分离机构;使所述气态燃烧流在所述气体发电轮机的膨胀器内膨胀,以产生至少一个单位的机械能和至少具有水组分和二氧化碳组分的气态排出流;从所述气态排出流中除去所述水组分的至少一部分;和利用所述二氧化碳组分的至少一部分。
附图简述
研读以下详细说明和实施方式的非限制性实例的附图后,本发明的前述和其它优势将变得明显,附图中:
图1A-1B图解了本发明的用于低排放发电和烃采收的集成系统;
图2图解了示例性燃烧器的示意图,其可以被配置用于图1A-1B的系统中;
图3是操作图1A-1B系统的方法的示例性流程图;
图4图解图1A-1B的低排放发电系统的另一实施方式;
图5是操作图4的系统的方法的示例性流程图;
图6图解图1A-1B的低排放发电系统的又一实施方式;和
图7是操作图6的系统的方法的示例性流程图;
图8A-8C图解图1A-1B的低排放发电系统的另外的可选实施方式。
发明详述
在以下发明详述部分,结合优选的实施方式描述本发明的具体实施方式。但是,就以下描述特定于本发明的具体实施方式或具体使用而言,这意图仅为示例性的目的并仅仅提供示例性实施方式的描述。因此,本发明并不限于以下所描述的具体实施方式,而是,其包括落入所附权利要求的精神和范围内的所有可选项、改型和等同物。
本系统的至少一个益处是集成两种采收方法以产生两种注入气体(氮和CO2)用于另外的烃采收。为实现这一点,首先压缩空气。可以捕集压缩期间产生的热量并用于发电或盐水脱盐。然后冷却的压缩空气被送至空气分离机构(ASU)。ASU产生氮流和氧流。氧与燃料气体和CO2结合并用于烃的燃烧。然后燃烧产物被送至膨胀器以产生动力,所述膨胀器可以是热气体膨胀器或气体发电轮机的膨胀器(其可以在与发电机整合的轴上或驱动分离发电机的整合轴上)。然后来自膨胀器的排出气体被用于加热移向燃烧器的CO2以提高循环效率、产生可用于产生另外能量或盐水脱盐的蒸汽,或者既用于加热移向燃烧器的CO2,增加效率,又用于提供能量和/或脱盐。然后燃烧产物(CO2和水)被进一步冷却以使水冷凝并产生CO2流,所述CO2流可以在系统内循环,任选地与所述氧流预混合以稀释,被分离,用于提高采收率法采油(EOR),或出售给第三方。
本公开系统和方法的实施方式可以被用于产生超低排放电力和用于EOR的CO2。通过在动力装置循环中将通常循环返回的CO2用于另外的EOR,可以产生电力,向大气排放很少或没有排放NOx或CO2。来自常规EOR采收系统的CO2和轻烃被压缩并与氧和其它燃料气体一起燃烧,然后在热气体膨胀器内膨胀以产生电力。也可以通过在冷凝蒸汽循环如热回收蒸汽发生器(HRSG)中对来自热气体膨胀器的排出气体进行热回收来产生额外的电力。因为化学计量燃烧的产物仅仅是CO2和水,可以通过冷却烟道气和从流中冷凝出水来产生高纯CO2流。该方法的结果是产生电力并生产额外的CO2。然后所述CO2流(在一些实施方式中减去再循环组分)被送回EOR设备进行另外的压缩并再注入返回井中,用于另外的采油。
尽管完全独立地生产用于油藏压力保持的氮和用于EOR的二氧化碳是可能的,但是本公开系统和方法的实施方式利用了这样的协同作用——当以集成方法产生氮和二氧化碳以低得多的成本产生这些气体同时也产生电力和/或超低排放的脱盐水时这是可能。值得注意的是,如果EOR利用是不可能的,则通过发电产生的CO2可以从再循环流中被清除并被分离或储存。这允许各种实施方式被用于以超低排放发电。
在典型的气井压力增强或保持操作中,一般通过从空气中分离氮(例如在ASU中)来产生氮以达到注入井要求的氮流的规格。这样的方法产生富氧流,其被排回到大气中。通过给ASU增加相对小量的递增动力和投资,空气可以被分离成高纯氮流和高纯氧流。为产生廉价的CO2,高纯氧流是期望的。如果在大量氮的存在下发生燃烧,那么将需要昂贵的和能量密集型加工设备将CO2从其它气体如一氧化二氮(NOx)中分离出来。本发明目前公开的许多实施方式使用高纯氧流来燃烧烃并产生CO2和水。通过简单地冷却燃烧产物来完成水的分离。
在一个示例性实施方式中,高纯氧流可以被用于产生廉价的CO2和水。较低纯度的氧具有两个问题。第一,基于低纯氧的燃烧产物分离相对昂贵——极端的是基于空气作为氧化剂的燃烧产物。这可以导致过于昂贵的烟道气分离。第二,所得到的烟道气的较低热容降低了所公开实施方式的总热力学优势。最大化工程经济所需的氧纯度水平因工程的不同而不同。一般而言,所需的纯度水平可以不低于50%。这用空气分离方法如基于膜或低温方法的分离方法可以达到。特别地,本公开系统的一个实施方式利用基于低温分离的空气分离机构(ASU)或利用分子筛的分离。在用于基于低温的ASU的氧纯度谱的低端是对于高纯氮生产优化的ASU设计,这使氧纯度低于70%。该流可以包含大于20%的氮水平。在所述谱的另一端是对于高纯氧生产优化的ASU设计,其中甚至氩也被从氧中分离出来,这使得氧纯度接近于100%。
在本公开的一些实施方式中,ASU是用于从空气中分离氮和氧的低温方法。与ASU相关的成本依赖于所期望的产品纯度。相较于生产95%氧,生产99.5%纯氧要求明显增加的资金和马力。因此,在含氧燃料燃烧中使用的氧的纯度应该基于燃烧产物的规格而进行限定。如果要求高纯CO2流,那么可能需要高纯氧。如果燃烧产物被排出,那么可以使用较低纯度的氧。
在一个实施方式中,燃烧在升高的压力下进行,所以通过使燃烧产物膨胀穿过膨胀器,可以产生额外的电力。Brayton循环的效率是跨膨胀器的压力比率和膨胀器的入口温度的函数。因此,使压力比率增高和膨胀器入口温度增高增加燃气轮机的效率。膨胀器的入口温度可以由材料事项和部件表面的冷却限制。在一些实例中,储层气体具有高井口压力(例如,从约1,000磅每平方英寸(psi)至约6,000psi)和高浓度的惰性气体,所以可以不需要增压器。在高压燃烧器使用这些类型的燃料然后在膨胀器部分使之膨胀可以产生高效率并提供利用这些储层的经济方式。依据可获得的井口压力,在升高的压力下也可以停止膨胀以减少与压缩用于EOR的CO2或分离CO2相关的成本。例如,使膨胀器排气为1barg(1bar表压或约14.5psig)相较于仅有几英寸水的正压可以节省几乎25%的使CO2获得临界条件(在临界点或高于临界点——约31℃和约73.8barg或1,070psig)所需的压缩能。将膨胀器背压增加至5barg(约72.5psig)节约大约55%的压缩能,将背压增加至10barg(约145psig)节约大约70%的CO2压缩能。
使用的燃烧器可以类似于在气化方法中使用的那些,其中氧和烃在还原气氛(reducing atmosphere)下反应,使用蒸汽调节温度。在本发明中,CO2将代替蒸汽使用以调节温度。使用蒸汽是昂贵的并会导致在燃烧产物中形成额外的氢,这在本循环中是不期望的。通过将CO2与氧混合,有可能使用更多传统的扩散型燃烧器——类似于在现有燃气轮机中使用的那些,其中CO2将代替空气使用以冷却燃烧衬里。优选接近化学计量条件下的燃烧(或″稍微富余″的燃烧)以消除除去额外氧的成本。如果火焰稳定性要求较稀浓度燃烧(leaner combustion),除去氧的商业技术目前是可获得的。
现在参考附图,图1A-1B图解了用于本发明低排放发电和烃采收的集成系统。在图1A中,系统100包括空气分离机构124和气态控制燃料流125,空气分离机构124从大气流123中产生高纯氧流128和高纯氮流126。也提供燃烧器134,其至少燃烧氧流128和燃料流125的组合,以产生气态燃烧流136。发电系统139接收燃烧流136并生成水155、电140和压缩的、气态的、基本为二氧化碳的流162,其被送至注入压缩机164以形成注入流166,用于注入提高采收率法采油油藏或二氧化碳分离位置167。氮流126被送至注入压缩机169以形成注入流170,用于注入压力保持油藏或氮气储存位置171。
图1B图解系统100的示例性实施方式。系统101包括产生第一混合流体烃采出流103的第一烃采收油藏102,并包括分离机构104、液体烃产物流106、包括一些二氧化碳(CO2)和轻烃(例如甲烷、乙烷等)的第二气态原料流108——其可以与再循环流160混合以形成包含基本是CO2(例如从约60体积百分比至约95vol%)的低能量(例如低BTU)流109、至少一个压缩机构110A-110X——其包括压缩机并可以包括冷却机构以压缩和冷却低能量流109来提供第一压缩低能量气态流112。系统100进一步包括产生第二混合流体烃采出流114的第二烃采收油藏113、第二分离机构116、烃产物流118和包含基本是氮(N2)(例如从约70体积百分比至约100vol%)的惰性气体原料流120。系统100还包括空气进入流121,其在压缩机122中被压缩以形成压缩空气进入流123,其进入空气分离机构124以产生高纯氮流(例如从约85vol%至约100vol%)126和高纯氧流(例如从约70vol%至约100vol%)128。高纯氧流128在燃烧器134内与气态控制燃料流125一起燃烧。低能量气态流112也被引入燃烧器134用于温度控制、质量流并可能用于流112中部分烃的部分燃烧。
高纯氧流128与气态控制燃料流125在燃烧器134内的组合被配置为保持最低绝热火焰温度和火焰稳定性,以燃烧富氧燃料流128中的所有或几乎所有的氧(例如,优选为化学计量反应)。就热值而言,氧流128没有热值,控制燃料流125具有相对大的热值(例如从至少300英国热单位每标准立方英尺(BTU/scf)至约900BTU/scf或从约500BTU/scf至约700BTU/scf),低能量流112具有相对小的热值(例如从约100BTU/scf至约450BTU/scf或从约150BTU/scf至约300BTU/scf)。值得注意的是,当控制燃料流125与低能量流112预先混合时,混合流的热值可以是从约200BTU/scf至约500BTU/scf。流112、125和128的燃烧产生气态燃烧流136,其可以与低能量气体侧流112′混合以提供冷却,形成膨胀器进入流137,流137进入膨胀器138以产生机械能140和气态排出流142。要注意的是,膨胀器138可以是动力燃气轮机上的膨胀器或热气体膨胀器。
气态排出流142基本上可以包括二氧化碳和蒸发的水,并被送至热回收蒸汽发生器(HRSG)144或类似装置。HRSG 144产生蒸汽流146,其可以被送至蒸汽轮机150以产生额外的能量152,冷却的排出气体148被送至冷却机构154,其产生水排空流155和基本上为二氧化碳的流156。基本上为二氧化碳的流156被送至配置为形成压缩的二氧化碳流162的压缩机158,流162被送至井注入压缩机164,于此流162被压缩以形成高度压缩的二氧化碳流166,用于注入提高采收率法采油(EOR)油藏167。同时,惰性气体原料流120可以与高纯氮流126混合以形成压力保持流168,其可以在压缩机169内被压缩以形成注入流170,用于注入压力保持油藏或氮储库171。
尽管提及四个油藏101、113、167和171,但油藏可以都是同一个油藏,是两个、三个或四个不同的油藏,并可以包括多个用于注入或生产的油藏。此外,采出流102和114的内含物可能随时间改变,特别是在注入气体开始生成的“突破点”。
一般而言,EOR油藏167是包含基本上是液体烃如原油的油藏或其一部分并且通常位于含水层之上。液体烃在适当的温度和压力下与注入的压缩二氧化碳流166可混相。高CO2浓度(例如上至约90体积%或以上)以这样的混相驱动操作是优选的,因为CO2用作稀释剂以降低油的粘度和作为溶剂以从地层岩石中除去油以及其它原因。此外,如果混合适当,将气体166泵入油藏需要更少的动力。注入流166中的氧水平优选地保持非常低。
一般而言,压力保持油藏171是在产油层上包括气顶的油藏或其一部分。当产生液体时,气顶压力和地层压力减少,导致较低的生产力并且可能在气体部分导致反缩合。注入气体170被配置为保持油藏内的压力以至少保持采收压力并避免反缩合。混相能力不是这种操作中的问题。因此,惰性气体如氮是优选的。在至少注入油藏167和171是同一个的具体示例性情况中,氮可以被注入油藏的气顶,二氧化碳被用作混相注入物,以在同一油藏中用于EOR。
采出流103和114可以是相同的或不同的,或者包括来自多个油藏的生产并且可以包括任何种类的轻或重液体和气态烃组分以及其它非烃组分如二氧化碳、硫化氢、氮、硫化羰及其组合。在最初或早期阶段的生产期间,预期在采出流103和114中具有比酸或非烃组分明显多的重烃组分。新鲜的(sweet)流103和114的示例性内含物包含从至少约70摩尔百分比(mol%)的烃至约99mol%烃、从约1mol%至约5mol%CO2、从约0mol%N2至约5mol%N2以及一些其它组分。
在烃被采出时以及特别地一旦气体发生冲出,组成可以发生急剧变化。例如,在CO2冲出之后,示例性采出流103或114可以具有以下含量:约5摩尔百分比(mol%)的烃至约60mol%的烃,从约40mol%至约95mol%的CO2,从约0mol%N2至约10mol%N2以及一些其它组分。在氮冲出之后,示例性采出流103或114可以具有以下含量:约5摩尔百分比(mol%)的烃至约60mol%的烃,从约5mol%至约20mol%的CO2,从约40mol%的N2至约95mol%N2以及一些其它组分。要注意的是,冲出是个瞬时过程而不是逐步过程,逐步过程相对快但产生的气体冲出量逐步增加。例如,油藏在早期生产期间可以稳定地产生约5mol%的CO2,然后在过渡期(从一个月到几年)产生渐增量的CO2,直至CO2的产生达到约95mol%CO2的高稳态产生。
分离机构104和116可以是相同的机构、不同的机构、或每个包含多个机构,这些多个机构取决于采出流103和114的内容物而分别串联或并联。分离机构104和116可以包含用于烃分离的任何已知的技术,如例如:冷冻、解吸油吸附、在固体吸附剂如硅胶上吸附、吸附动力学分离、低温分离或这些方法的一些组合。进一步地,一旦发生冲出,分离组分、设备和方法可能要求调整、去瓶颈或总替换以应对采出流内含物的差异。
第一和第二烃产物流106和118可以包含轻烃和重烃,如丙烷、丁烷、戊烷、己烷或芳香烃、天然汽油以及甚至原油。产物流106和118优选地被送至下游用于进一步处理,和出售或其它应用,但流106′和118′的一部分可以被用在系统100中。在分离之后,剩余的气态流108和120将分别具有采出流103和114的内含物,但较重的烃被分离机构104和116除去。
下表提供系统100的实施方式中气态流112、125、128、136、137和162的示例性组成(以及引入流112、125和128的摩尔流量比率),其中基本上是二氧化碳的流156被注入提高采收率法采油操作中的烃采收油藏并且是在CO2冲出之后。流112、125和128的流量比率是按体积分数。
表1
在初始气态流103或108处于足够高压力下的一些实施方式中,可以不需要压缩机110A-110X。在其它实施方式中,压缩机110A-110X可以包括一至四个离心压缩机110A-110D,在其之间可以包括中间冷却器,根据系统要求和经济学,还可以有单个轴向压缩机110或一些组合。如所述,燃烧器134和膨胀器138内的较高压力可以提高系统101的总效率。例如,膨胀器排气142可以从约1barg至约10barg或约4barg至约6barg或约5barg。预期的是,本领域普通技术人员具有足够的信息来设计压缩机110A-110X、燃烧器134和膨胀器134,以获得根据本公开的较高压力膨胀器排气。
在另外的实施方式中,使流112保持较高温度用于混合以及在燃烧器134内进行燃烧可以是期望的。可以通过与热排出气体流136或142(如果使用流142,可以在交叉交换之间将其压缩)、系统100内其它压缩机(例如压缩机122、压缩机158或压缩机164)中的一个产生的热或HRSG144的交叉交换来加热流112。优选的是足以提高燃烧器134内燃烧效率的温度。在一个实施方式中,酸性气体流112在进入燃烧器134时可以为约50摄氏度(℃)至约500℃。
燃烧器134可以是标准的外部燃烧器或可以是定制的或改进的燃烧器。可使用的燃烧器类型的实例包括oxyClaus燃烧器、部分氧化(POX)燃烧器、自热重整(ATR)燃烧器、扩散燃烧器(diffusion burners)、贫燃预混(lean-premix)燃烧器和点火燃烧器。要注意的是,每个燃烧器类型可以要求一些改进以与基本上是CO2的流一起工作。在扩散火焰燃烧器(或″燃烧装置″)中,燃料与氧化剂混合并同时在主燃烧区燃烧。扩散燃烧器产生接近化学计量的燃料/空气混合物区域,在此区域,温度非常高。在预混合燃烧器中,燃料和空气在初始阶段被完全混合,形成均匀、贫燃、未燃烧的燃料/空气混合物,其被送至发生燃烧反应的第二阶段。目前贫燃预混燃烧器因为较低的火焰温度在燃气轮机中常用,其产生较低的NOx排放。在点火燃烧器中,热点火引导确保在其周围的贫燃料氧化剂混合物保持稳定燃烧。这些点火燃烧器通常被用于航空发动机和用于其本身不能保持稳定燃烧的燃料。
图2图解了示例性燃烧器134的示意图,其可被配置用于系统100中。因此,可以参考图1A-1B最好地理解图2。燃烧器134的该实施方式可以被称作″氧燃烧器″并包括燃烧室200、气体混合室(或喷雾室)202、燃烧喷嘴206、第二气体入口204A-204B和外壁(或护罩)210。
在一个示例性实施方式中,喷雾室202以及喷嘴204A-204B和206可以被配置为以高度激烈的方式使天然气流125与包含酸性气体流112和高纯氧流128的氧化流混合,以确保获得均匀的混合物。在操作期间,火焰208产生上至约2,200℃的温度。随着冷却气体112的加入,排出气体212预期上至约1,400℃。可以经外壁210引入额外的冷却气体112,产生一种″气体包围层(gas envelope)″以使室200的璧比火焰208明显冷。在一个示例性实施方式中,如果需要,冷却流112可以被除去烃以最小化煤烟的形成。在另一示例性实施方式中,在高于大气压的压力下发生燃烧。反应生成水(蒸汽)和二氧化碳,如以下方程式所示(进入室内的二氧化碳通常保持未反应):
CH4+2O2=2H2O+CO2
燃烧过程的特征在于高的燃料对氧化剂之比,其远超过化学计量比,导致过于充足的燃烧过程。可以通过精确计量进入燃烧器134的氧128和天然气125来实现燃烧反应的控制。温度也被用于修正燃料和氧流量的控制。在包括EOR的优选实施方式中,燃料125和氧128被计量以产生恰低于化学计量的混合物,优选地在富余氧一侧,以避免在得到的流136中有尽量多的氧。基于燃烧产物的反馈控制可以被用于修正燃料和氧之比。
典型的部分氧化(POX)燃烧器将天然气125与蒸汽氧化流146混合成均匀的混合物。蒸汽的添加不仅用来调节反应温度还在反应中产生额外的氢。部分氧化过程的特征在于高的燃料对氧化剂之比,远超过化学计量比。POX是超富燃烧过程的实例。
典型的oxyClaus燃烧器(未显示)包括围绕中心起始燃烧器马弗炉的多个酸性气体燃烧器。每个酸性气体燃烧器包括来自氧流128、低能量流112和控制燃料流125的原料或“喷入”。温度可以上至约2,200℃(约1,900K)或者甚至更高。组合的原料流128、112和125可以形成非常热的氧火焰,其被如来自控制流112′的更冷的气体包围层包围。
在典型的热自热重整(ATR)方法(未显示)中,天然气-蒸汽(例如125和146)和氧128的混合物被送人燃烧器134。在燃烧区发生部分氧化反应,然后产物通过催化剂床,在此发生重整反应。ATR反应器由带有燃烧器、燃烧室和催化剂床的耐火衬里压力容器组成。其设计类似于POX反应器的设计,但还包含催化剂床。生成的合成气温度与POX反应器的1,650K相比,为约1,300开尔文(K)。合成气温度的减少是重要的,因为催化剂不支持较高的温度值。ATR可以产生明显较高的合成气中H2与CO之比,并且还是无煤烟操作。
在典型的扩散燃烧器装置(未显示)中,燃料和氧化剂(少于约30体积百分比(vol%)的氧128和基本上纯的二氧化碳的稀释混合物)以非常激烈的方式混合以获得均匀的混合物并促进完全燃烧。本系统100使用基本纯的CO2以稀释氧化剂并提供温度控制。尽管低能量气体流112可能是足够纯的,在该类系统中作为稀释剂使用之前,仍然可能要求通过分子筛(mole sieve)、膜或其它方法(未显示)使之更纯化。外部燃烧器134可以被制成合适大小以提供燃烧完成所要求的停留时间,并获得EOR应用所要求的低氧水平。
图3是在有效的、低排放系统如图1A-1B所示的系统中生产烃的方法的示例性流程图。因此,可以参考图1A-1B最好地理解图3。方法300包括分离空气以形成高纯氧流和高纯氮流302,提供气态控制燃料流304,使所述控制燃料和高纯氧流燃烧以形成具有CO2和H2O的燃烧流306,接收燃烧流进入发电系统以至少产生压缩的、气态的、基本为二氧化碳的流308,将所述压缩的、气态的、基本为二氧化碳的流注入提高采收率法采油油藏310,以及将高纯氮流注入强化氮替代油藏312。
本发明的多个可选实施方式是可能的,其中一些在本文中被更详细地描述,其中的其它实施方式对本领域普通技术人员来说是显而易见的。在一个可选的实施方式中,水流155可经路线155′被送入HRSG144以产生更多蒸汽146。在另一可选的实施方式中,气态控制燃料流125至少部分地由烃流118′、烃流118的衍生流组成。这样的配置提供了另一集成协同作用并且可以降低系统100的总操作成本。进一步的可选实施方式包括从低能量流109截取滑流108′以向用于EOR的注入压缩机164提供CO2。这样的方法可以允许EOR在系统100的其它元件处于合适位置之前早处于方法中,或者可以根据系统100的要求简单地使各个流109和162平衡。
在另一可选的实施方式中,出于安全或控制原因,流108可以直接被送入燃烧器134或者气态控制燃料流125以与其预混合。在此预混合配置中,二氧化碳再循环流160可以基本上无烃以使流160可以被用作燃烧器134内的温度控制稀释剂。
在另一可选的实施方式中,所有的或部分的压缩二氧化碳流160被再循环至低能量流109。这一特别的实施方式在系统100的操作早期,例如在EOR行为需要之前,可能是有用的。在这种情况下,或许有利的是,提供额外量的CO2至燃烧器134用于温度控制和质量流量控制目的,以产生更多电力140用于出售或使用。特别地,如果有很少或没有EOR行为,压缩机164是不需要电力的,这节省了低排放产生的电力140用于出售或另外的目的。该可选动力装置循环也可以有利于产生大量的CO2用于出售或简单地使CO2聚集或分离直至EOR或其它目的需要。
下表提供可选再循环情况的气态流112、125、128、136、137和160(以及引入流112、125和128的摩尔流比率)的示例性组成,其中基本上是二氧化碳的流156经线路160被再循环至燃烧器134。
表2
如从表中应该明显看出的,系统100的完全再循环实施方式形成了比以上表1中所述的完全注入情况稍微较高的CO2浓度,并且也包括较高的摩尔流量比率,这致使产生的CO2比注入情况中显著更多。
燃烧稳定性是本发明的一个重要方面。尽管有很多可能的方法提供化学计量的或接近化学计量条件的稳定燃烧,但这些许多方法被限制或技术上不可行。预热气态控制燃料流125以及低能量流112和112′并控制氧128和CO2混合物浓度是确保燃烧稳定性的所有可能的方法。系统100的一个可能的实施方式包括使部分气态排出流142或气态燃烧流136改变方向以加热流125、112和112′。
一些可选的燃烧选项包括向气态控制燃料流125或低能量气态流112添加氢,如美国专利号6,298,652所公开的。向气态控制燃料流125或低能量气态流112添加较重的烃(C2+)以确保燃烧稳定性或许还是经济的。可以独立购买这些较重的烃,或可以由线路118′提供。添加这些燃料可能需要额外的净化设备,所以这种方法的经济学应该被谨慎考虑。
在又一可选实施方式中,HRSG144中的热回收可以在升高的压力下进行。在这样的方法中,气态排出流142的体积可以显著减少,并且水在较高温度下凝结出来;这使得水的除去更易于完成,且使冷凝热在较高温度下可得到,这对于发电152或脱盐(未显示)更有价值。
图4图解图1A-1B的低排放发电系统的另一实施方式。因此,可以参考图1A-1B最好地理解图4。系统400包括生产第一混合流体烃采出流103的烃采收油藏102,并且包括分离机构104、液体烃产物流106、包含一些CO2和轻烃的第二气态原料流108——其可以与再循环流160混合以形成主要包含CO2的低能量流109、至少一个压缩机构110A-110X——其包括压缩机并可以包括冷却机构以压缩和冷却低能量气态原料流109来提供第一压缩低能量气态流112。系统400进一步包括外部燃烧器410以结合并燃烧高纯氧流128和控制燃料流125与压缩低能量气体流112,产生气态燃烧流136,气态燃烧流136可以与压缩的低能量侧流112′混合以形成膨胀器进入流137。热气体膨胀器420被提供,其接收膨胀器进入流137以产生能量140和膨胀的排出流142,排出流142可以被送至HRSG 144以经蒸汽轮机150产生蒸汽146和能量152。在蒸汽产生之后,流148可以被送至冷却机构154以冷凝并滴出水组分155,形成基本上为二氧化碳的流156,流156被送至CO2压缩机158,然后经线路160再循环或经线路162送至注入压缩机164用于注入EOR油藏167。要注意的是,流156的一部分可以被再循环而剩余部分被注入。
热气体膨胀器420可以是商业可得的机构,如来自General Electric的FEX-125或类似型号。但是,膨胀器420也可以是稍微改进的机构以在预期的温度和压力下处理基本为CO2的流体136。在一个示例性实施方式中,多个热气体膨胀器420A-420X将平行排列。尽管期望一些改进,但高压热气体膨胀器420是比集成的气体发电轮机更有效的设备。例如,在气体发电轮机中使用基本为CO2的工作流体136出现困难的且未解决的热力学和操作问题,它们可能需要重新设计基础(ground-up)轮机。参见例如美国专利申请号2007/0237696和SNARHEIM,DAGFINN等,Control Design for a Gas Turbine Cycle withCO2 Capture Capabilities,16th IFAC World Congress,Prague,Czech Rep.,July 2005。但是,热气体膨胀器没有气体发电轮机的复杂性。热气体膨胀器的使用增加了为提高性能而进行系统优化的自由度。例如,操作压力可被升高以增加Brayton动力循环的热力学效率。由于这些和其它原因,热气体膨胀器420与气体发电轮机相比可更适合于运行基本为CO2的工作流体排出气体136或137,而且可以不需要新设计。
图5是操作图4中系统的示例性方法。因此,可以参考图1A-1B和4最好地理解图5。方法500包括产生和分离502烃流102以形成压缩的低能量气体流112,提供504高纯氧流128,提供506气态控制燃料流125,在外部燃烧器410中燃烧508至少高纯氧流128和气态控制燃料流125的组合以产生含二氧化碳和水的气态燃烧流136,在热气体膨胀器420中使气态燃烧流136或137膨胀510,以产生至少一个单位的机械能140和气态排出流142,从气态排出流148中除去512至少一部分水组分155,以及使用514生成的二氧化碳组分156的至少一部分。
图6图解图4的低排放发电系统的另一实施方式。因此,可以参考图1A-1B和4最好地理解图6。系统600包括与系统100、101和400相同的许多组件。但是,系统600使用气体发电轮机620代替热气体膨胀器420。轮机入口压缩机605被配置为接收大气121,通过管道或类似机构605连接至膨胀器620,且包括燃烧器610。
在这样的系统600中,气体发电轮机将仍使用压缩的低能量气体流112作为工作流体以冷却系统,因为来自入口压缩机605的压缩空气123被用在空气分离机构124中。在一个特别的实施方式中,压缩空气流123的体积流量将产生足够满足燃烧器134内化学计量反应所需要的氧量的高纯氧流128。
图7是操作图6系统的示例性方法。因此,可以参考图1A-1B和6最好地理解图7。方法700包括产生和分离702烃流102以形成压缩的低能量气体流112,在配置为产生至少高纯氧流128的空气分离机构124中分离空气704,提供706气态控制燃料流125,在燃烧器610内燃烧708、至少高纯氧流128和气态控制燃料流125的组合以产生含二氧化碳和水的气态燃烧流136,在燃气轮机的膨胀器620中使气态燃烧流136或137膨胀710以产生至少一个单位的机械能140和气态排出流142,在气体发电轮机605的入口压缩机中压缩空气712以形成压缩空气流123,将压缩空气流123提供714到空气分离机构124,从气态排出流148中除去716至少一部分水组分155,以及使用718生成的二氧化碳组分156的至少一部分。
图8A-8C图解图1A-1B的低排放发电系统的另外的可选实施方式。因此,可以参考图1A-1B最好地理解图8A-8C。图8A图解用于生产烃的系统800,其中来自压缩机110a-110x的压缩低能量气体流802可以在燃烧器134内混合和燃烧前通过HRSG 144,以热调节(例如冷却)低能量气体流802。系统800进一步包括处于压缩机110a-110x和膨胀器138之间的管道804,以形成动力轮机(power turbine)。另外,冷却机构154产生基本为二氧化碳的流806,其可以被至少部分再循环到压缩机110a-110x和/或转移到流808至压缩机164用于注入和/或分离、储存或排出。一旦再循环回路通过线路806建立起来,可能不需要线路108,除非用于补充低热值燃料的量。在又一可选实施方式中,线路108可以被直接转移到燃烧器134作为稀释剂或被转移到线路125与气态流108和125在燃烧前预混。图8B图解了系统820,其与系统800非常相似,除了基本为二氧化碳的流808B从流802中被转移。图8C图解系统840,其与系统820非常相似,除了其不通过管道(shaft)804合并压缩机110a-110x与膨胀器138。
在系统100、101、400、600、800、820或840的任何一个中,优选避免昂贵的和能量密集的CO2分离设备。为了实现该目标,氧流128的纯度可以足以限制杂质的存在,从而避免另外的分离设备或方法。
在一些实施方式中,系统100、101、400、600、800、820或840的至少一部分可被设置在海上驳轮或平台上。在这样的系统中,能量可在海上或陆上被利用,且油藏113、171、102和167的至少一个也可以位于海上位置。
在公开的系统和方法的一些实施方式中,燃料杂质也可以被考虑。应当只考虑产生可满足EOR规格的副产物的燃料,或处于足够高的经济优势以使去除它们的加工装备可被认为是适当的燃料。
在氩气市场存在的情况下,ASU 124中用于其分离的额外成本、能量和复杂性可以认为是适当的。
虽然本发明可能有各种改进和可选形式,但以上讨论的示例性实施方式仅以实例的方式被显示。然而,还应该理解本发明并不意欲限于本文公开的特定实施方式。事实上,本发明包括落入所附权利要求的真正精神和范围内的所有替代方式、改进和等同物。
Claims (59)
1.集成系统,包括:
空气分离机构,其被配置为产生高纯氧流和高纯氮流;
气态控制燃料流;
燃烧机构,其被配置为使至少所述气态控制燃料流和所述高纯氧流在接近化学计量但稍微燃料富余的条件下燃烧,以产生含二氧化碳和水的气态燃烧流;
至少包括膨胀器的发电系统,其被配置为接收所述含二氧化碳和水的气态燃烧流并至少产生压缩的、气态的、基本为二氧化碳的流;
第一注入器机构,其被配置为将所述压缩的、气态的、基本为二氧化碳的流的至少一部分注入提高采收率法采油油藏;和
第二注入器机构,其被配置为将所述高纯氮流的至少一部分注入压力保持油藏。
2.根据权利要求1所述的系统,其中所述膨胀器被配置为接收所述气态燃烧流并产生至少一个单位的机械能和气态排出流;并且所述发电系统进一步包括:
热回收机构,其被配置为接收并冷却所述气态排出流,产生至少一个单位的热能,并生成至少一体积的水和冷却的、气态的、基本上为二氧化碳的流,其中所述热能任选地被利用以生成产生蒸汽能的蒸汽;和
二氧化碳压缩机,其被配置为压缩所述冷却的、气态的、基本上为二氧化碳的流以产生所述压缩的、气态的、基本为二氧化碳的流。
3.权利要求2所述的系统,进一步包括:
第一烃采收油藏,其被配置为产生第一烃混合物;和
第一烃分离机构,其被配置为至少将液体烃从所述第一烃混合物中分离出来并产生第一烃流和包括二氧化碳和烃的第二气体流,其中所述燃烧机构被进一步配置为利用所述第二气体流的至少一部分与所述气态控制燃料流和所述高纯氧流,产生所述含二氧化碳和水的气态燃烧流。
4.权利要求3所述的系统,进一步包括:
第二烃采收油藏,其被配置为产生第二烃混合物;和
第二烃分离机构,其被配置为至少将液体烃从所述第二烃混合物中分离出来并产生第二烃流和包括氮气的惰性气体流,其中所述第二注入器进一步被配置以将所述惰性气体流注入所述压力保持油藏。
5.根据权利要求4所述的系统,其中所述提高采收率法采油油藏选自:所述第一烃采收油藏、所述第二烃采收油藏、另一烃采收油藏及其任意组合。
6.根据权利要求4所述的系统,其中所述压力保持油藏选自:所述第一烃采收油藏、所述第二烃采收油藏、另一烃采收油藏及其任意组合。
7.权利要求3所述的系统,进一步包括再循环回路,其被配置为将所述压缩的、气态的、基本为二氧化碳的流的至少一部分引向所述燃烧机构或所述第二气体流。
8.权利要求3所述的系统,进一步包括控制算法,其被配置为控制所述气态控制燃料流、所述包含二氧化碳和烃的第二气体流和所述高纯氧流的混合和燃烧,以确保所述高纯氧流内基本上所有氧耗尽。
9.根据权利要求8所述的系统,其中所述燃烧机构选自:氧燃烧器、预混合燃烧器、点火燃烧器、部分氧化(POX)燃烧器、扩散燃烧器、自热重整器和oxyClaus反应炉燃烧器。
10.根据权利要求2所述的系统,其中所述膨胀器选自:气体发电轮机中的膨胀器和热气体膨胀器。
11.权利要求10所述的系统,进一步包括入口压缩机,其被配置为压缩大气以形成压缩空气流,其中所述空气分离机构被配置以利用所述压缩空气流形成所述高纯氧流和所述高纯氮流。
12.根据权利要求11所述的系统,其中所述膨胀器是所述气体发电轮机中的膨胀器,并且所述入口压缩机被所述气体发电轮机驱动,以及所述压缩的、气态的、基本为二氧化碳的流被用作所述气体发电轮机的膨胀器内的工作流体。
13.根据权利要求4所述的系统,其中所述包括二氧化碳和烃的第二气体流包含60体积百分比的二氧化碳至95体积百分比的二氧化碳;
其中所述高纯氧流包含70体积百分比的氧至100体积百分比的氧;
其中所述含氮的惰性气体流包含70体积百分比的氮至100体积百分比的氮;
其中所述气态控制燃料流包含80体积百分比至100体积百分比的甲烷;以及
其中所述高纯氮流包含85体积百分比的氮至100体积百分比的氮。
14.根据权利要求1-2的任何一项所述的系统,其中所述高纯氮流的至少一部分被送至选自以下的场所:氮储存场所、氮出售场所和氮排出场所。
15.权利要求3所述的系统,进一步包括第二气体压缩机,其被配置为压缩所述包括二氧化碳和烃的第二气体流以形成压缩的第二气体流,之后将所述压缩的第二气体流的至少一部分送至所述燃烧机构。
16.根据权利要求1-2的任何一项所述的系统,其中所述压缩的、气态的、基本为二氧化碳的流的至少一部分被送至选自以下的场所:二氧化碳分离场所、二氧化碳出售场所、碳捕集场所、排出场所及其任意组合。
17.权利要求11所述的系统,进一步包括脱盐设备,其被配置为利用所述机械能、所述蒸汽能、所述至少一个单位的热能和所述入口压缩机产生的热的至少一种。
18.权利要求15所述的系统,进一步包括交叉交换加热系统,其被配置为将从热源产生的热的至少一部分转移至所述压缩的第二气体流,其中所述热源选自:所述二氧化碳压缩机、所述热回收机构、所述气态燃烧流、所述气态排出流及其任意组合。
19.根据权利要求2所述的系统,其中所述气态排出流在大气压以上被提供至所述热回收机构。
20.改进的烃采收方法,包括:
将空气分离成高纯氧流和高纯氮流;
提供气态控制燃料流;
在燃烧器内使至少所述气态控制燃料流和所述高纯氧流在接近化学计量但稍微燃料富余的条件下燃烧以形成含二氧化碳和水的气态燃烧流;
将所述含二氧化碳和水的气态燃烧流接收入至少包括膨胀器的发电系统,其中所述发电系统至少产生压缩的、气态的、基本上为二氧化碳的流;
将所述压缩的、气态的、基本上为二氧化碳的流的至少一部分注入提高采收率法采油油藏;和
将所述高纯氮流的至少一部分注入压力保持油藏。
21.根据权利要求20所述的方法,其中所述膨胀器使所述气态燃烧流膨胀以产生至少一个单位的机械能和气态排出流;操作所述发电系统的方法进一步包括:
在配置的热回收机构内冷却所述气态排出流,以产生至少一个单位的热能,冷却的、气态的、基本上为二氧化碳的流和一体积的水,其中所述至少一个单位的热能任选地被利用以产生用于产生至少一个单位的蒸汽能的蒸汽;和
在二氧化碳压缩机内压缩所述冷却的、气态的、基本上为二氧化碳的流以形成所述压缩的、气态的、基本为二氧化碳的流。
22.权利要求21所述的方法,进一步包括:
从第一烃采收油藏产生第一烃混合物;
将所述第一烃混合物分离为第一烃流和包括二氧化碳和烃的第二气体流;和
将所述包括二氧化碳和烃的第二气体流的至少一部分送至:1)所述气态控制燃料流以混合,或者2)燃烧所述气态控制燃料流和所述高纯氧流的步骤中的所述燃烧器。
23.权利要求22所述的方法,进一步包括:
从第二烃采收油藏产生第二烃混合物;
将所述第二烃混合物分离为第二烃流和含氮的惰性气体流;和
将所述含氮的惰性气体流加入所述高纯氮流用于注入所述压力保持油藏。
24.权利要求22所述的方法,进一步包括在将所述第二气体流的至少一部分送至所述燃烧器之前压缩所述包括二氧化碳和烃的第二气体流以形成压缩的第二气体流。
25.权利要求22所述的方法,进一步包括使所述压缩的、气态的、基本为二氧化碳的流的至少一部分再循环至所述燃烧器或所述第二气体流。
26.权利要求21所述的方法,进一步包括提供所述一体积的水的至少一部分用作灌溉水或用于产生蒸汽。
27.根据权利要求21所述的方法,其中所述膨胀器选自:气体发电轮机内的膨胀器和热气体膨胀器。
28.权利要求27所述的方法,进一步包括在入口压缩机内压缩大气;和
在空气分离机构内利用压缩空气以形成所述高纯氧流和所述高纯氮流。
29.根据权利要求28所述的方法,其中所述膨胀器是所述气体发电轮机内的膨胀器,所述入口压缩机被所述气体发电轮机驱动;和
利用所述压缩的、气态的、基本为二氧化碳的流作为所述气体发电轮机内的工作流体。
30.根据权利要求23所述的方法,其中所述包括二氧化碳和烃的第二气体流包括60体积百分比的二氧化碳至95体积百分比的二氧化碳;
其中所述高纯氧流包含70体积百分比的氧至100体积百分比的氧;
其中所述含氮的惰性气体流包含70体积百分比的氮至100体积百分比的氮;
其中所述气态控制燃料流包含80体积百分比至100体积百分比的甲烷;以及
其中所述高纯氮流包含85体积百分比的氮至100体积百分比的氮。
31.根据权利要求23所述的方法,其中所述提高采收率法采油油藏选自:所述第一烃采收油藏、所述第二烃采收油藏、另一烃采收油藏及其任意组合。
32.根据权利要求23所述的方法,其中所述压力保持油藏选自:所述第二烃采收油藏、所述第一烃采收油藏、另一烃采收油藏及其任意组合。
33.权利要求24所述的方法,进一步包括利用选自以下的热源加热所述压缩的第二气体流的至少一部分:通过压缩所述冷却的、气态的、基本上为二氧化碳的流产生的热;通过压缩大气产生的热;来自所述含二氧化碳和水的气态燃烧流的热;来自所述气态排出流的热;所述至少一个单位的热能及其任意组合。
34.权利要求28所述的方法,进一步包括利用选自以下的热源加热所述压缩的第二气体流的至少一部分:通过压缩所述冷却的、气态的、基本上为二氧化碳的流产生的热;通过压缩大气产生的热;来自所述含二氧化碳和水的气态燃烧流的热;来自所述气态排出流的热;所述至少一个单位的热能及其任意组合。
35.权利要求22所述的方法,进一步包括控制所述气态控制燃料流、所述包括二氧化碳和烃的第二气体流以及所述高纯氧流的混合和燃烧,以确保高纯氧流内基本上所有氧耗尽。
36.根据权利要求35所述的方法,其中所述燃烧器选自:氧燃烧器、预混合燃烧器、点火燃烧器、部分氧化(POX)燃烧器、扩散燃烧器、自热重整器和oxyClaus反应炉燃烧器。
37.权利要求21所述的方法,进一步包括在脱盐设备中使水脱盐,其中所述脱盐设备利用所述至少一个单位的机械能、所述至少一个单位的热能、所述至少一个单位的蒸汽能、通过压缩所述冷却的、气态的、基本上为二氧化碳的流产生的热、来自所述含二氧化碳和水的气态燃烧流的热、来自所述气态排出流的热中的至少一个,及其任意组合。
38.根据权利要求21所述的方法,其中所述气态排出流在大气压以上被提供至所述热回收机构。
39.权利要求20所述的方法,进一步包括将所述压缩的、气态的、基本为二氧化碳的流的至少一部分送至选自以下的场所:二氧化碳分离场所、二氧化碳出售场所、碳捕集场所及其任意组合;以及
将所述高纯氮流的至少一部分送至氮储存场所。
40.低排放发电系统,包括:
第一烃采收油藏,其被配置为产生第一烃混合物;
第一烃分离机构,其被配置为至少将液体烃从所述第一烃混合物中分离出来并产生第一烃流和包括二氧化碳的第二气体流;
气态控制燃料流;
高纯氧流;
外部燃烧器,其被配置为使所述气态控制燃料流、所述高纯氧流和所述包含二氧化碳的第二气体流的组合在接近化学计量但稍微燃料富余的条件下燃烧以产生气态燃烧流;
热气体膨胀器,其被配置为接收所述气态燃烧流并产生至少一个单位的机械能和至少具有二氧化碳组分和水组分的气态排出流;和
操作系统,其被配置为调节所述气态排出流以充分地从中除去所述水组分并利用所述二氧化碳组分的至少一部分。
41.根据权利要求40所述的系统,其中所述操作系统进一步包括:
热回收机构,其被配置为接收所述气态排出流并产生一体积的水,冷却的、气态的、基本上为二氧化碳的流,和热能,其中所述热能任选地被利用以产生蒸汽,其中所述蒸汽的至少一部分被利用以产生蒸汽能;和
压缩机,其被配置为压缩所述冷却的、气态的、基本上为二氧化碳的流以产生压缩的、气态的、基本为二氧化碳的流。
42.根据权利要求41所述的系统,所述操作系统进一步包括:
再循环回路,其被配置为将所述压缩的、气态的、基本为二氧化碳的流的至少一部分引向所述外部燃烧器和所述包含二氧化碳的第二气体流的至少一个。
43.根据权利要求41所述的系统,其中所述压缩的、气态的、基本为二氧化碳的流的至少一部分被用在选自以下的系统中:用于将所述压缩的、气态的、基本为二氧化碳的流的至少一部分注入提高采收率法采油油藏和二氧化碳分离场所之一的系统,用于将所述压缩的、气态的、基本为二氧化碳的流的至少一部分改向至二氧化碳捕集场所、排出场所、二氧化碳出售场所中的一个及其任意组合的系统。
44.根据权利要求41所述的系统,其中所述外部燃烧器选自:氧燃烧器、预混合燃烧器、点火燃烧器、部分氧化(POX)燃烧器、扩散燃烧器、自热重整器和oxyClaus反应炉燃烧器。
45.低排放发电的方法,包括:
从第一烃采收油藏产生第一烃混合物;
将所述第一烃混合物分离为第一烃流和包括二氧化碳的第二气体流;
提供高纯氧流;
提供气态控制燃料流;
在外部燃烧器内使至少所述高纯氧流和所述气态控制燃料流的组合在接近化学计量但稍微燃料富余的条件下燃烧以产生含二氧化碳和水的气态燃烧流;
使所述气态燃烧流在热气体膨胀器内膨胀以产生至少一个单位的机械能及至少具有水组分和二氧化碳组分的气态排出流;
从所述气态排出流中除去所述水组分的至少一部分;和
利用所述气态排气流的所述二氧化碳组分的至少一部分。
46.权利要求45所述的方法,进一步包括:
在热回收机构内冷却所述气态排出流,其中所述冷却产生一体积的水,冷却的、气态的、基本上为二氧化碳的流,和热能,其中所述热能任选地被利用以产生蒸汽,其中所述蒸汽的至少一部分被用于产生蒸汽能;和
压缩所述冷却的、气态的、基本上为二氧化碳的流以产生压缩的、气态的、基本为二氧化碳的流。
47.权利要求46所述的方法,进一步包括将压缩的、气态的、基本为二氧化碳的流的至少一部分再循环至所述外部燃烧器和所述包括二氧化碳的第二气体流中的至少一个。
48.根据权利要求46所述的方法,其中所述压缩的、气态的、基本为二氧化碳的流的至少一部分被用在选自以下的方法中:将压缩的、气态的、基本为二氧化碳的流的至少一部分注入提高采收率法采油油藏和二氧化碳分离场所中的至少一个,将压缩的、气态的、基本为二氧化碳的流的至少一部分改向至碳捕集场所和二氧化碳出售场所中的一个,及其任意组合。
49.低排放发电系统,包括:
第一烃采收油藏,其被配置为产生第一烃混合物;
第一烃分离机构,其被配置为至少将液体烃从所述第一烃混合物中分离出来并产生第一烃流和包括二氧化碳的第二气体流;
气态控制燃料流;
空气分离机构,其被配置为至少提供高纯氧流;
燃烧器,其被配置为使所述气态控制燃料流、所述高纯氧流和所述包括二氧化碳的第二气体流的组合在接近化学计量但稍微燃料富余的条件下燃烧以产生气态燃烧流;
气体发电轮机,所述气体发电轮机包括:
入口压缩机,其中所述入口压缩机被配置为压缩大气以送至所述空气分离机构;和
膨胀器,其被配置为接收所述气态燃烧流并产生至少一个单位的机械能和至少具有二氧化碳组分和水组分的气态排出流;和
操作系统,其被配置为调节所述气态排出流以充分地除去所述气态排出流的水组分并利用所述气态排出流的所述二氧化碳组分的至少一部分。
50.根据权利要求49所述的系统,所述操作系统进一步包括:
热回收机构,其被配置为接收所述气态排出流并产生热,一体积的水和冷却的、气态的、基本上为二氧化碳的流,其中所述热任选地被利用以产生用于产生蒸汽能的蒸汽;和
压缩机,其被配置为压缩所述冷却的、气态的、基本上为二氧化碳的流以产生压缩的、气态的、基本为二氧化碳的流。
51.根据权利要求50所述的系统,所述操作系统进一步包括:
再循环回路,其被配置为将所述压缩的、气态的、基本为二氧化碳的流的至少一部分引向所述燃烧器和所述包括二氧化碳的第二气体流中的一个。
52.根据权利要求50所述的系统,其中所述压缩的、气态的、基本为二氧化碳的流的至少一部分被用在选自以下的方法中:将压缩的、气态的、基本为二氧化碳的流的至少一部分注入提高采收率法采油油藏和二氧化碳分离场所中的至少一个,将压缩的、气态的、基本为二氧化碳的流的至少一部分改向至碳捕集场所和二氧化碳出售场所中的一个,及其任意组合。
53.根据权利要求50所述的系统,其中所述水组分被用于产生所述蒸汽和灌溉中的一种。
54.低排放发电方法,包括:
从第一烃采收油藏产生第一烃混合物;
将所述第一烃混合物分离为第一烃流和包括二氧化碳的第二气体流;
在空气分离机构内分离空气,所述空气分离机构被配置以至少产生高纯氧流;
提供气态控制燃料流;
在燃烧器内使至少所述高纯氧流和所述气态控制燃料流的组合在接近化学计量但稍微燃料富余的条件下燃烧以产生含二氧化碳和水的气态燃烧流;
在气体发电轮机的入口压缩机内压缩空气以形成压缩的空气流;
将所述压缩的空气流提供至所述空气分离机构;
使所述气态燃烧流在所述气体发电轮机的膨胀器内膨胀以产生至少一个单位的机械能和至少具有水组分和二氧化碳组分的气态排出流;
从所述气态排出流中除去所述水组分的至少一部分;和利用所述二氧化碳组分的至少一部分。
55.权利要求54所述的方法,进一步包括:
在热回收机构内冷却所述气态排出流,其中所述冷却产生一体积的水,冷却的、气态的、基本上为二氧化碳的流和热,其中所述热任选地被利用以产生蒸汽,所述蒸汽用于产生至少一个单位的蒸汽能;和
压缩所述冷却的、气态的、基本上为二氧化碳的流以产生压缩的、气态的、基本为二氧化碳的流。
56.权利要求55所述的方法,进一步包括将所述压缩的、气态的、基本为二氧化碳的流的至少一部分再循环至所述燃烧器和所述包括二氧化碳的第二气体流中的一个。
57.根据权利要求55所述的方法,其中所述压缩的、气态的、基本为二氧化碳的流的至少一部分被用在选自以下的方法中:将压缩的、气态的、基本为二氧化碳的流的至少一部分注入提高采收率法采油油藏和二氧化碳分离场所中的至少一个,将压缩的、气态的、基本为二氧化碳的流的至少一部分改向至碳捕集场所和二氧化碳出售场所中的一个,及其任意组合。
58.根据权利要求56所述的方法,其中所述水组分被用于产生所述蒸汽和灌溉中的一种。
59.根据权利要求1、40和49中任何一项所述的系统,其中所述系统的至少一部分位于海上驳船或平台上。
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- 2009-03-25 CA CA2715186A patent/CA2715186C/en not_active Expired - Fee Related
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- 2009-03-25 CA CA2934541A patent/CA2934541C/en not_active Expired - Fee Related
- 2009-03-25 EP EP09724390.1A patent/EP2268897B1/en active Active
- 2009-03-25 CA CA2934542A patent/CA2934542C/en not_active Expired - Fee Related
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CN101981272A (zh) | 2011-02-23 |
CA2934541C (en) | 2018-11-06 |
US20110000221A1 (en) | 2011-01-06 |
EP2268897B1 (en) | 2020-11-11 |
WO2009120779A3 (en) | 2010-01-07 |
CA2934542A1 (en) | 2009-10-01 |
EP2268897A4 (en) | 2017-10-18 |
EP2268897A2 (en) | 2011-01-05 |
CA2715186A1 (en) | 2009-10-01 |
CA2934541A1 (en) | 2009-10-01 |
CA2715186C (en) | 2016-09-06 |
WO2009120779A2 (en) | 2009-10-01 |
AU2009228283B2 (en) | 2015-02-05 |
AU2009228283A1 (en) | 2009-10-01 |
US8984857B2 (en) | 2015-03-24 |
CA2934542C (en) | 2018-11-06 |
MY156350A (en) | 2016-02-15 |
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