CN102762501B - 废热驱动式脱盐工艺 - Google Patents
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Abstract
公开了一种用于改进联合循环动力发生装置和脱盐单元的效率的工艺。该工艺包括供应来自用来产生电功率的燃气轮机机组的排气到热回收蒸汽发生器(HRSG),并且然后引导蒸汽从HRSG到蒸汽轮机机组。供应盐水到脱盐单元的效应器中。在脱盐单元的效应器中,利用从蒸汽轮机机组排出的蒸汽,以通过热交换而从效应器产生蒸馏蒸气和浓盐水。此外,蒸汽是从来自联合循环动力发生装置的至少一个额外的热源引入到效应器的蒸汽,以增加进入效应器的蒸汽的质量流率。在一个实施例中,额外的热源是中间冷却器热交换器。提供来自中间冷却器热交换器的被加热的水到减压闪蒸罐,并且提供闪蒸罐中闪蒸的蒸汽到效应器。
Description
技术领域
本发明大体涉及动力发生和盐水的同时脱盐,并且更具体地说,涉及通过使用排出蒸汽以外的其它废热源加热在盐水的脱盐中使用的水来改进热效率。
背景技术
使用蒸汽膨胀产生动力是普遍的工艺。冷凝物被馈送到锅炉且被加热。从锅炉移除蒸汽,并且蒸汽是典型地过热的。然后蒸汽穿过涡轮而膨胀,从而做功。然后蒸汽冷凝,并且再循环到锅炉。间歇性地从锅炉抽取适量的液体来防止污泥积聚。添加处理过的新鲜水到该系统来补偿材料损失。当前在使用中的双重目的的脱盐/动力装置通过将排出蒸汽用作蒸馏单元的热源来产生新鲜水。基本,动力装置的冷凝器由蒸馏单元的效应器(effect)替代。这允许高效地产生新鲜水。
当使脱盐装置集成到燃气轮机动力装置中时,它们总是被结合为利用燃气轮机和蒸汽轮机两者的联合循环动力装置。在联合循环装置中,利用高压蒸汽产生电,高压蒸汽通过与燃气轮机排气的热交换来产生,以运行涡轮,涡轮又给发电机提供动力。在典型的情况中,锅炉产生处于大约540℃(1000℉)的高压蒸汽。当这种蒸汽在涡轮中膨胀时,它的温度和能量水平被降低。蒸馏装置需要具有大约120℃(248℉)或更低的温度的蒸汽,并且这种蒸汽可以通过这样来得到:在已经使用其大部分能量来产生电之后,在涡轮的低压端处抽取较低温度的蒸汽。然后这种低压蒸汽运行通过蒸馏装置的浓盐水加热器,从而提高进入的盐水的温度。然后来自被抽取的蒸汽的冷凝物返回到锅炉再加热。
然而,在商业应用中典型的脱盐装置会减少从联合循环动力装置产生的电,因为它们仍然抽取相对高压的蒸汽,高压的蒸汽否则会在蒸汽轮机中进一步膨胀。此外,它们未有效地利用在蒸馏工艺中的其它废热源。因此,存在对增加联合循环动力装置中的脱盐的效率的工艺的需要。
发明内容
在一方面,本发明涉及一种用于改进联合循环动力发生装置和热脱盐单元的效率的工艺。该工艺包括供应来自用来产生电功率的燃气轮机机组的排气到热回收蒸汽发生器(HRSG),并且然后引导蒸汽从HRSG到蒸汽轮机机组。供应盐水到热脱盐单元中,热脱盐单元的工艺可以是单效蒸馏或多效蒸馏、多级闪蒸、膜蒸馏或正向渗透。示出的实施例考虑具有单效蒸馏的热脱盐工艺。在蒸馏单元的效应器中,利用从蒸汽轮机机组排出的蒸汽,以通过热交换而从效应器产生蒸馏蒸气和浓盐水。此外,蒸汽是从来自联合循环动力发生装置的至少一个额外的热源引入到效应器的蒸汽,以增加进入效应器的蒸汽的质量流率。在一个实施例中,额外的热源是中间冷却器热交换器。提供来自中间冷却器热交换器的被加热的水到减压闪蒸罐(reduced atmosphere flash tank),并且提供闪蒸罐中闪蒸的蒸汽到效应器。在另一个实施例中,额外的热源是在HRSG中的节热器热交换器。提供来自节热器热交换器的被加热的水到减压闪蒸罐,并且提供闪蒸罐中闪蒸的蒸汽到效应器。
本发明的另一方面涉及一种联合循环动力发生装置和脱盐单元。该装置包括具有压缩机和燃气轮机的燃气轮机机组,在压缩机和燃气轮机之间有燃烧器。压缩机具有高压压缩机和低压压缩机,其中中间冷却器热交换器定位在高压压缩机和低压压缩机之间。该装置也包括蒸汽轮机机组,以及连接到燃气轮机机组上且接收来自燃气轮机机组的热排气的HRSG。HRSG提供蒸汽到蒸汽轮机机组。用于蒸馏盐水的脱盐单元具有接收来自蒸汽轮机机组的排出蒸汽的至少一个效应器。该装置也包括构造成接收来自中间冷却器热交换器的被加热的水的减压闪蒸罐。来自中间冷却器热交换器的被加热的水的一部分在闪蒸罐中被闪蒸成蒸汽,并且然后被提供到脱盐单元的效应器,以增加进入效应器的蒸汽的质量流率。在另一个实施例中,该装置也包含在HRSG中的节热器热交换器。提供来自节热器热交换器的被加热的水到减压闪蒸罐。来自节热器热交换器的被加热的水的一部分在闪蒸罐中被闪蒸成蒸汽,并且然后被提供到脱盐单元的效应器,以增加进入效应器的蒸汽的质量流率。
在参照附图阅读下面的详细描述以及所附权利要求书之后,本发明及其优于现有技术的优点将变得显而易见。
附图说明
通过参照结合附图得到的本发明的实施例的以下描述,本发明的上述及其它特征将变得更显而易见,并且本发明自身将较好被理解,其中:
图1是根据本发明的一个实施例的联合循环动力发生和脱盐组件的示意图;以及
图2是一个实施例的示意图,该实施例包括额外的热交换器,以利用图1的联合循环动力发生和脱盐组件来预热通往热脱盐装置或RO(反渗透)单元的进料水。
具体实施方式
现将参照附图在下面的详细描述中描述本发明,其中详细描述了优选实施例来使本发明的实践成为可能。虽然参照这些具体的优选实施例描述本发明,但将理解,本发明不局限于这些优选实施例。而是与此相反,本发明包括许多的备选方案、修改方案,以及等效方案,通过考虑下面的详细描述,这些方案将变得显而易见。
如本文贯穿说明书和权利要求书所使用,近似语言可以应用于修饰可容许改变的任何数量表达,而不引起与其相关的基本功能的改变。因此,由一个用语或多个用语(例如“大约”)修饰的值不局限于规定的精确值。在至少一些情形中,近似语言可以对应于用于测量该值的仪器的精度。可以组合和/或互换范围限制,并且这种范围被标示,且包括所有本文包括的子范围,除非上下文或语言另外指明。除了在操作实例中或另外指明的地方,在说明书和权利要求书中使用的指示成分、反应条件等的量的所有数字或表达在所有情形中均应该被理解为是由用语“大约”来修饰。
“可选的”或“可选地”意指随后描述的事件或情况也许发生或也许不发生,或者随后标示的材料也许存在或也许不存在,并且该描述包括其中该事件或情况发生或者其中该材料存在的情形,以及其中该事件或情况不发生或者该材料不存在的情形。
如本文所使用,用语“构成”、“包含”、“包括”、“包括在内”、“有”、“具有”或其任何其它变型旨在覆盖非排它性的包含。例如,包括一列要素的工艺、方法、制品或设备不必局限于仅仅那些要素,而是可以包括未明确列举的其它要素,或者这种工艺、方法、制品或设备固有的其它要素。
单数形式“一”、“一个”,以及“该”包括多个所指物,除非上下文清楚地另外指明。
图1是包括动力发生装置102和热脱盐单元103的示例性联合循环动力发生装置和脱盐单元100的示意图。本发明的所有实施例通过将废热流用于热脱盐来降低从联合循环装置转移的电。在示出的实施例中,动力发生装置102包括具有热回收部分106的燃气轮机装置104,该热回收部分106包括热回收蒸汽发生器(HRSG)108。虽然本文实施例使用来自燃气轮机动力装置104的废热来驱动脱盐,但是本领域的技术人员应当理解本发明也能够利用来自工业工艺或来自任何类型的动力装置(例如燃烧化石的锅炉、燃烧生物量的锅炉、废物回收锅炉、废物焚烧炉、核锅炉、燃料电池动力装置、地热源,以及太阳能源)的废热。
在示例性的实施例中,燃气轮机动力装置104包括通过轴124联接到涡轮122上的低压压缩机或增压器114和高压压缩机120。燃烧器126被联接在高压压缩机120和涡轮122之间,使得压缩机120的出口被联接成通过燃烧器126与涡轮122的入口处于流连通。在运行中,空气流动通过高压压缩机120,并且被压缩的空气输送到燃烧器126。来自燃烧器126的排气流驱动涡轮122,如本领域所熟知,涡轮122又驱动发电机(未显示)。用尽的排气通过涡轮排气出口132离开涡轮122,到HRSG 108。排气被引导通过HRSG 108中的通道,使得包含在排气中的热使流动通过HRSG 108的水转换成蒸汽。然后排气从HRSG 108被排出,并且被释放到大气或污染控制装置(未显示)。在一个示例性实施例中,燃气轮机发动机装置104是由通用电气公司制造的机型LMS 100。
在示例性实施例中,燃气轮机发动机装置104包括定位在低压压缩机114和高压压缩机120之间的中间冷却器热交换器140,以有利于降低进入高压压缩机120的空气的温度。使用中间冷却器热交换器140有利于增加燃气轮机发动机装置104的效率,同时降低由高压压缩机120执行的工作的量。合乎需要地,中间冷却器热交换器140使用水作为冷却媒介来冷却离开低压压缩机114的空气流。中间冷却器热交换器对于本领域技术人员是熟知的,并且不需要在本文进一步详细描述。
在HRSG 108中产生的高压蒸汽发送到蒸汽集管146,在蒸汽集管146中,蒸汽可用于分配到蒸汽轮机机组150。在一个实施例中,蒸汽的一部分通过管线154发送到涡轮150的高压部分152。蒸汽抵靠着高压部分152膨胀,并且然后可以返回到HRSG 108,在HRSG 108中,添加额外的过热。然后蒸汽经由管线156回到蒸汽轮机机组150的中压区段,并且在涡轮158的低压部分中继续其膨胀。如本领域所熟知,当高压蒸汽和低压蒸汽抵靠着涡轮机组150膨胀时产生动力,并且该动力经由动力移送轴(未显示)移除。
在传送通过蒸汽轮机机组150的低压部分158之后,然后排出蒸汽发送成以便用作装置100的热脱盐单元103中的热源。在示出的实例中,脱盐单元103是由冷凝器或效应器159组成的单效蒸馏装置。虽然在示意图中显示的是单效蒸馏装置,但是应该理解或者单效蒸馏脱盐装置或者多效蒸馏(MED)脱盐装置都可以集成到联合循环动力发生和脱盐装置100中。此外,在不脱离本发明范围的情况下,热脱盐单元103也可以使用多级闪蒸工艺、膜蒸馏工艺或正向渗透工艺。脱盐单元103包括用来供应原始盐水到效应器159的盐水入口160、用于从效应器159移除处理过的新鲜水且供应处理过的新鲜水到新鲜水存储系统(未显示)的蒸馏产物水出口162,以及返回冷凝的蒸汽到HRSG 108的冷凝物返回线164。在示出的实施例中,冷凝物返回线164首先通往补充水存储罐166。
脱盐单元103接收蒸汽,以在蒸馏工艺中来使原始水沸腾,或者在闪蒸工艺中加热水。引导来自蒸汽轮机机组150的加热蒸汽到效应器159,在效应器159中,加热蒸汽冷凝且一小部分的盐水蒸发。在用来冷凝在蒸馏产物水出口162中的蒸汽的产物水冷凝器168中,来自入口160的进入的盐水可以首先用作冷却水。从而进入的盐水在进入效应器159之前被预热。在一个实施例中,也可以引导在产物水冷凝器168中加热的盐水的一部分经由管线171到RO单元167。通往RO单元167的水的提高的温度会改进RO单元的性能。本文对包括来自大海和大洋的海水的“盐水”作出参照,但是在入口160处引入的盐水也可以被理解为包括淡盐水源、浓盐水、废水,以及包含矿物质、盐以及溶解的固体等的再使用或回收的其它水源。离开效应器159的蒸馏蒸气进入产物水冷凝器168,在产物水冷凝器168中,蒸汽冷凝且变成产物水。在169处抽出在端部处留存的浓盐水。
在将其热量传递到效应器159中的盐水之后,来自蒸汽轮机机组150的排出气体冷凝,并且经由补充水罐166返回到HRSG 108,在HRSG 108中,它在持续的循环中再次被加热成蒸汽。补充水罐166具有通往HRSG 108的第一管线170,以完成蒸汽/冷凝物HRSG循环。补充水罐166也具有通往中间冷却器140的管线172,以供应补充水到中间冷却器。
第一热水管线180传输来自中间冷却器150的热水到减压闪蒸罐184。在闪蒸罐184中,热水的一部分闪蒸成蒸汽。第二热水管线182传输来自在HRSG 108中的节热器的热水到闪蒸罐184,该节热器捕捉来自烟道气的废热。在HRSG中的节热器的使用在本领域中熟知,并且不需要进一步详细讨论。引导在闪蒸罐184中闪蒸的蒸汽经由管线185到蒸馏单元103的效应器159,以增加进入效应器159的蒸汽的质量流。未在闪蒸罐184中闪蒸成蒸汽的水经由返回管线186返回到补充水入口罐166。在一个实施例中,闪蒸罐184可以在物理上集成到蒸馏装置103的蒸发器中。在闪蒸罐中留存的热水返回到补充水罐166。备选地,可以不使用闪蒸罐,并且热水管线180和182直接通往蒸馏单元103的输入管线185。
在包含MED装置的实施例中,减压闪蒸罐166可以位于MED装置的各个效应器之前。各个闪蒸罐166可以在物理上集成到MED装置的对应的效应器中。热水流(例如来自中间冷却器150的热水)的一部分在各个效应器之前被闪蒸,以增加进入效应器的质量流率。
现在来看图2,在额外的实施例中,使来自盐水入口160’的进入的盐水在进料水热交换器190中变暖。在一个实施例中,引导变暖的盐水经由管线171’到RO装置167。然而,应该理解在不脱离本发明范围的情况下,也可以引导变暖的盐水到热脱盐单元103。在示出的实施例中,在热交换器190中的热源可以来自两种不同的流。一种热流是经由管线191来自闪蒸罐184的液体馏分。三通阀192引导液体馏分经由管线186’到热交换器190或到补充水存储罐166(图1)。另一个热流是经由管线182’来源于HRSG 108中的节热器的热水流。备选地,可以输送经由管线180’(未显示)来源于中间冷却器140的热水流到热交换器190。来自节热器或中间冷却器140的热水的量由在进料流管线171’上的温度控制器194确定,该热水直接行进到进料水热交换器190,并且从而绕过闪蒸罐184。温度控制器194发送信号196到温度受控的三通阀198,该温度受控的三通阀199使热水的一部分经由管线199被引导到热交换器190而不是到闪蒸罐184。在传送通过热交换器190之后,水经由管线200被返回到补充水罐166(图1)。
因此,单效蒸馏单元或多效蒸馏单元103替代动力发生装置102的冷凝器。使用来自蒸汽轮机机组150的蒸汽之外的额外的热源来进一步加热进入各个效应器159的盐水。否则这些热源可被排出。本文描述的装置100对这些废热流提供了周到的使用,同时不损害联合循环动力发生装置102的净动力输出。
虽然在典型的实施例中已经示出和描述了本公开,但本公开并不意图局限于所显示的细节,因为在不以任何方式脱离本公开精神的情况下,可以进行各种修改和代替。因而,对于使用不超过常规实验的本领域技术人员而言,可想到本文公开的本公开的进一步修改和等效方案,并且所有这种修改和等效方案被认为是在由所附权利要求书限定的本公开的范围内。
Claims (13)
1.一种用于改进联合循环动力发生装置和脱盐单元的效率的工艺,所述工艺包括:
供应来自用来产生电功率的燃气轮机机组的排气到热回收蒸汽发生器(HRSG);
供应盐水到热脱盐单元中;
在所述热脱盐单元中,利用来自所述HRSG的蒸汽,以通过热交换而从所述脱盐单元产生蒸馏蒸气和浓盐水;以及
从来自所述联合循环动力发生装置的额外的热源引入热能到所述热脱盐单元,以增加来自所述热脱盐单元的产物水的质量流率;
所述工艺还包括:引导来自所述HRSG中的节热器热交换器的被加热或被产生的蒸汽和/或热水到进料盐水热交换器,以经由温度受控的三通阀预热反渗透单元的进料盐水和预热通往所述热脱盐单元的进料盐水。
2.根据权利要求1所述的工艺,其特征在于,所述工艺进一步包括:
引导蒸汽从所述HRSG到蒸汽轮机机组;以及
在所述热脱盐单元中,利用从所述蒸汽轮机机组排出的蒸汽,以通过热交换而从所述脱盐单元产生蒸馏蒸气和浓盐水。
3.根据权利要求1所述的工艺,其特征在于,所述额外的热源是热交换器,其中,提供来自所述热交换器的被加热或被产生的蒸汽到所述热脱盐单元。
4.根据权利要求1所述的工艺,其特征在于,所述额外的热源是热交换器,其中,提供来自所述热交换器的被加热的水到减压闪蒸罐,并且其中,提供在所述闪蒸罐中闪蒸的蒸汽到所述热脱盐单元。
5.根据权利要求4所述的工艺,其特征在于,所述热交换器是所述节热器热交换器,其中,提供来自所述节热器热交换器的被加热的水到减压闪蒸罐,并且提供在所述闪蒸罐中闪蒸的蒸汽到所述热脱盐单元。
6.根据权利要求4所述的工艺,其特征在于,所述热交换器是中间冷却器热交换器,其中,提供来自所述中间冷却器热交换器的被加热的水到减压闪蒸罐,并且提供在所述闪蒸罐中闪蒸的蒸汽到所述热脱盐单元。
7.根据权利要求4所述的工艺,其特征在于,通往所述热脱盐单元的进入的盐水首先在产物水冷凝器中用作冷却水,所述产物水冷凝器用来冷凝离开所述脱盐单元的产物水,并且从而预热所述进入的盐水。
8.根据权利要求7所述的工艺,其特征在于,引导被预热的盐水的一部分到反渗透单元。
9.根据权利要求4所述的工艺,其特征在于,引导来自所述闪蒸罐的热水到RO热交换器,以预热反渗透单元的进料盐水。
10.根据权利要求4所述的工艺,其特征在于,引入来自所述额外的热源的蒸汽到所述脱盐单元的效应器中,以增加进入所述效应器的蒸汽的质量流率。
11.根据权利要求4所述的工艺,其特征在于,所述额外的热源是废热源。
12.一种联合循环动力发生装置和脱盐单元,包括:
燃气轮机机组,其包括压缩机和燃气轮机,在所述压缩机和所述燃气轮机之间有燃烧器,所述压缩机包括高压压缩机和低压压缩机,其中,中间冷却器热交换器定位在所述高压压缩机和所述低压压缩机之间;
蒸汽轮机机组;
连接到所述燃气轮机机组上且接收来自所述燃气轮机机组的热排气的热回收蒸汽发生器(HRSG),所述HRSG提供蒸汽到所述蒸汽轮机机组;
用于蒸馏盐水的脱盐单元,其具有接收来自所述蒸汽轮机机组的排出蒸汽的热交换器;
构造成以接收来自所述中间冷却器热交换器的被加热的水的减压闪蒸罐,其中,所述被加热的水的一部分在所述闪蒸罐中被闪蒸成蒸汽,并且被提供到所述脱盐单元,以增加来自所述脱盐单元的产物的质量流率;以及
进料盐水热交换器,来自所述HRSG中的节热器热交换器的被加热或被产生的蒸汽和/或热水被引导到所述进料盐水热交换器中,以经由温度受控的三通阀预热反渗透单元的进料盐水和预热通往所述脱盐单元的进料盐水。
13.根据权利要求12所述的联合循环动力发生装置和脱盐单元,其特征在于,所述联合循环动力发生装置和脱盐单元进一步包括在所述HRSG中的节热器热交换器,其中,提供来自所述节热器热交换器的被加热的水到所述减压闪蒸罐,并且其中,来自所述节热器热交换器的所述被加热的水的一部分在所述闪蒸罐中被闪蒸成蒸汽,并且被提供到所述热脱盐单元,以增加来自所述单元的产物的质量流率。
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EP2516334B1 (en) | 2014-12-10 |
CA2785533C (en) | 2018-05-15 |
WO2011078907A1 (en) | 2011-06-30 |
US20110147195A1 (en) | 2011-06-23 |
CN102762501A (zh) | 2012-10-31 |
CL2012001713A1 (es) | 2014-04-11 |
US8545681B2 (en) | 2013-10-01 |
AU2010333902A1 (en) | 2012-07-19 |
NZ600841A (en) | 2014-08-29 |
ES2527995T3 (es) | 2015-02-03 |
BR112012015571C8 (pt) | 2019-09-10 |
BR112012015571B8 (pt) | 2019-08-20 |
PT2516334E (pt) | 2015-02-06 |
CA2785533A1 (en) | 2011-06-30 |
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