CN111749740A - 发电设备以及发电设备的输出增加控制方法 - Google Patents
发电设备以及发电设备的输出增加控制方法 Download PDFInfo
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Abstract
本发明提供一种发电设备以及发电设备的输出增加控制方法,在增加发电设备的发电输出的方面,不需要冷凝水贮存罐或能够使其容量变小,此外,不依赖于脱气机容量。发电设备具备锅炉(1)、涡轮机(2、3、4)、冷凝器(6)、供水加热器(9)、脱气机(10)、脱气机水位调节阀(30)、将从涡轮机抽出的蒸汽导入到供水加热器的抽气系统中设置的抽气阀(31),在该发电设备中设置辅助蒸汽导入系统(23),其向供水加热器(9)导入辅助蒸汽;辅助蒸汽调节阀,其设置在辅助蒸汽导入系统中,调节向供水加热器供给的蒸汽量,在请求急速增加负荷时,将抽气阀控制为关闭方向,将脱气机水位调节阀控制为维持开度,将辅助蒸汽调节阀控制为打开方向。
Description
技术领域
本发明涉及发电设备以及发电设备的输出增加控制方法。
背景技术
对于发电设备的发电输出的急速负荷增加请求,具有使抽气阀和脱气机水位调节阀以恒定速度进行关闭动作直至固定开度为止,临时使发电输出增加的被称为冷凝水节流运转控制的控制方法(例如,专利文献1)。
在冷凝水节流运转控制中,因为对脱气机水位调节阀进行关闭控制,脱气机水位调节阀下游的冷凝水流量暂时减少,脱气机的水位降低。因此,需要设置具有能够弥补水位降低的容量的脱气机,设置这样的脱气机存在使设备成本增加的问题。
此外,为了避免脱气机水位调节阀的关闭控制导致的冷凝器内的水位上升,需要设置用于临时贮存脱气机水位调节阀上游的冷凝水的冷凝水贮存罐(Cold CondensateStorage Tank,以下称为CCST),设置这样的CCST成为设备成本进一步上升的原因。
专利文献1:日本特开2013-53531号公报
发明内容
本发明的目的在于,提供一种在使发电设备的发电输出增加的方面,能够不需要CCST或减小其容量,并且不依赖于脱气机容量的发电设备以及发电设备的输出增加控制方法。
本发明的发电设备具备:蒸汽产生装置;涡轮机,其由蒸汽产生装置产生的蒸汽进行驱动;冷凝器,其使从涡轮机排出的蒸汽成为冷凝水;供水加热器,其对通过冷凝泵升压后的冷凝水进行加热;脱气机,其对通过供水加热器加热后的冷凝水进行加热脱气;脱气机水位调节阀,其调节脱气机的水位;抽气系统,其将从涡轮机抽出的蒸汽导入供水加热器;以及设置在抽气系统中的抽气阀,上述发电设备设置:辅助蒸汽导入系统,其向供水加热器导入辅助蒸汽;辅助蒸汽调节阀,其设置在辅助蒸汽导入系统中,调节向供水加热器供给的蒸汽量,在请求急速增加负荷时,将抽气阀控制为关闭方向,将脱气机水位调节阀维持开度,将辅助蒸汽调节阀控制为打开方向。
根据本发明,在使发电设备的发电输出增加的方面,能够不需要CCST或减小其容量,并且能够实现不依赖于脱气机容量的发电输出增加,结果能够抑制设备成本的增加。
通过以下的实施方式的说明,使上述以外的课题、结构以及效果变得更加明确。
附图说明
图1表示本发明一实施例的发电设备的结构例。
具体实施方式
以下,使用附图详细说明本发明的实施例。
图1表示本发明的发电设备的结构例。此外,在附图中省略了主蒸汽阀等阀、脱盐装置等其他辅助机械的图示。
发电设备(蒸汽涡轮发电设备)由以下构成:锅炉(蒸汽产生装置)1、通过来自锅炉1的主蒸汽驱动的高压涡轮机2、通过由锅炉1对高压涡轮机2的排出蒸汽进行再加热而得到的再加热蒸汽驱动的中压涡轮机3、通过中压涡轮机的排出蒸汽驱动的低压涡轮机4、通过高压涡轮机、中压涡轮机以及低压涡轮机驱动的发电机5。此外,发电设备具备由冷凝器6、冷凝泵8、低压供水加热器9、脱气机10、供水泵11、高压供水加热器12等构成的冷凝/供水系统。
将来自低压涡轮机4的抽出蒸汽经由低压抽气配管22供给至低压供水加热器9。另外,在附图中仅图示了一台低压供水加热器9,但根据需要设置了多台。此外,也有向后级侧的低压供水加热器供给来自中压涡轮机的抽出蒸汽的情况。
将来自中压涡轮机3的抽出蒸汽经由第2高压抽气配管21供给至脱气机10。也有经由在中压涡轮机3的上游侧具有抽气位置的第1高压抽气配管20向脱气机10供给抽出蒸汽的情况。
经由在中压涡轮机3的上游侧具有抽气位置的第1高压抽气配管20向高压供水加热器12供给抽出蒸汽。另外,在附图中,仅图示了一台高压供水加热器12,但根据需要设置了多台。此外,也有向后级侧的高压供水加热器供给来自高压涡轮机的抽出蒸汽的情况。
在脱气机10的上游侧的冷凝系统中设有用于调节脱气机10的水位的脱气机水位调节阀30。在本实施例中,在冷凝泵8的下游的冷凝水配管7设有脱气机水位调节阀30。此外,在低压抽气配管22设有抽气阀31,该抽气阀31用于切断从低压涡轮机抽出的蒸汽或者调节抽出蒸汽量。
在本实施例中,还设有向低压供水加热器9导入辅助蒸汽的辅助蒸汽导入系统。辅助蒸汽导入系统具备系统内锅炉等辅助蒸汽源50、以及将来自辅助蒸汽源50的蒸汽导入到低压供水加热器9的辅助蒸汽供给管23,在辅助蒸汽供给管23设有用于调节向低压供水加热器9供给的蒸汽量的辅助蒸汽调节阀32。系统内锅炉用于获得供水泵驱动涡轮机的驱动用蒸汽、蒸汽涡轮机的冷却用蒸汽、脱气机的启动用蒸汽等,机动性优于锅炉1。
此外,在本实施例中,在低压抽气配管22设有用于测量抽出蒸汽量的流量计41,在低压供水加热器9设有用于测量低压供水加热器内的压力的压力计42。
并且,在本实施例中,设有控制装置100,该控制装置100将输出上升指令信号、来自流量计41、压力计42的信号等作为输入,输出向锅炉1的燃料投入指令信号、脱气机水位调节阀30、抽气阀31、辅助蒸汽调节阀32的开度指令信号等。
接着,对本发明的发电设备的输出增加控制方法的一实施例进行说明。
在针对发电设备具有急速负荷增加请求的情况下,直到锅炉负荷上升为止,通过以下所述的方法来控制如上所述构成的发电设备来应对发电输出的急速上升请求。
例如,当电力系统发生系统频率降低时,从中央供电指令所等向发电设备的控制装置100输出3%输出上升指令。
控制装置100当接收到3%输出上升指令时,向抽气阀31输出关指令,向辅助蒸汽调节阀32输出开指令。另外,此时,向在以往的冷凝水节流运转控制中被输入关指令的脱气机水位调节阀既不输出关指令也不输出开指令而维持该时间点的开度。另外,此时,控制装置100向锅炉1输出锅炉燃料投入指令使燃料增加,从而使锅炉1的产生蒸汽量增加。
通过对抽气阀31进行关闭控制,低压涡轮机4内部的后续阶段的蒸汽流量增加抽出流量减少的量,由此发电输出上升(实现发电输出上升3%)。
为了使锅炉1的产生蒸汽量增加,针对向锅炉1的供水流量输出增加指令。在以往的冷凝水节流控制中,脱气机水位调节阀被节流,由此流入脱气机的冷凝水流量减少,另一方面,通过供水流量增加指令,通过供水泵从脱气机向锅炉压力输送的供水流量增加。结果,在以往的冷凝水节流运转控制中,从脱气机排出的供水量(增加)与进入到脱气机的冷凝水量(减少)之间产生不平衡,脱气机的水位下降。因此,以往需要设置具有能够弥补水位下降的容量的脱气机,设备成本上升。
在本实施例中,因为是维持了脱气机水位调节阀30的开度的状态,所以脱气机10的水位不会下降。因此,不需要在增加发电输出的方面增大脱气机10的容量。即,能够实现不依赖于脱气机容量的发电输出增加。此外,即使关闭抽气阀31也会对辅助蒸汽调节阀32进行打开控制来向低压供水加热器9供给辅助蒸汽,因此能够进行所需的供水加热。
根据本发明的实施例,在急速负荷增加请求的应对运转中,不需要对脱气机水位调节阀30进行关闭控制,能够确保向低压供水加热器9流入的冷凝水的流量为恒定,从而脱气机水位以及冷凝器水位不发生变化,因此能够削减CCST、降低脱气机容量。
在锅炉1中,当锅炉产生蒸汽达到能够使输出增加3%的锅炉产生蒸汽量时,结束急速负荷增加请求的应对运转。具体地说,从控制装置100向抽气阀31以及辅助蒸汽调节阀32输出开度指令信号,使得抽气阀31返回到通常的开度,使辅助蒸汽调节阀32关闭。
另外,优选根据来自流量计41的流量信号来控制辅助蒸汽调节阀32的开度,使得弥补由于抽气阀31的关闭动作而减少的抽出蒸汽量。
此外,优选根据来自压力计42的压力信号来控制辅助蒸汽调节阀32的开度,使得弥补由于抽气阀31的关闭动作而降低的低压供水加热器9内的压力。
此外,优选在辅助蒸汽供给管23设置减温器60或减压器70,使来自辅助蒸汽源50的辅助蒸汽的温度或压力与抽出蒸汽的温度或压力一致。
另外,本发明并不限定于上述的实施例,还可以包括各种变形例。例如,上述的实施例是为了便于理解本发明而进行的详细说明,并不一定必须具备所说明的所有结构。此外,可以将某实施例的部分结构置换成其他实施例的结构,此外,也可以对某实施例的结构追加其他实施例的结构。此外,可以对各实施例的部分结构进行其他结构的追加、删除、置换。
符号说明
1…锅炉、2…高压涡轮机、3…中压涡轮机、4…低压涡轮机、5…发电机、6…冷凝器、7…冷凝配管、8…冷凝泵、9…供水加热器(低压供水加热器)、10…脱气机、11…供水泵、12…高压供水加热器、20…第1高压抽气配管、21…第2高压抽气配管、22…低压抽气配管、23…辅助蒸汽供给管、30…脱气机水位调节阀、31…抽气阀、32…辅助蒸汽调节阀、41…流量计、42…压力计、50…辅助蒸汽源、60…减温器、70…减压器、100…控制装置。
Claims (6)
1.一种发电设备,其具备:
蒸汽产生装置;
涡轮机,其由上述蒸汽产生装置产生的蒸汽进行驱动;
冷凝器,其使从上述涡轮机排出的蒸汽成为冷凝水;
供水加热器,其对通过冷凝泵升压后的冷凝水进行加热;
脱气机,其对通过上述供水加热器加热后的冷凝水进行加热脱气;
脱气机水位调节阀,其调节上述脱气机的水位;
抽气系统,其将从上述涡轮机抽出的蒸汽导入上述供水加热器;以及
设置在上述抽气系统中的抽气阀,
其特征在于,
上述发电设备具备:
辅助蒸汽导入系统,其向上述供水加热器导入辅助蒸汽;
辅助蒸汽调节阀,其设置在上述辅助蒸汽导入系统中,调节向上述供水加热器供给的蒸汽量;以及
控制装置,其对上述脱气机水位调节阀、上述抽气阀以及上述辅助蒸汽调节阀输出开度指令信号,
在对上述发电设备请求急速增加负荷时,上述控制装置将上述抽气阀控制为关闭方向,将上述脱气机水位调节阀控制为维持开度,将上述辅助蒸汽调节阀控制为打开方向。
2.根据权利要求1所述的发电设备,其特征在于,
在上述辅助蒸汽导入系统的辅助蒸汽供给管内设置了辅助蒸汽的减温器。
3.根据权利要求1所述的发电设备,其特征在于,
在上述辅助蒸汽导入系统的辅助蒸汽供给管内设置了辅助蒸汽的减压器。
4.一种发电设备的输出增加控制方法,该发电设备具备:
蒸汽产生装置;
涡轮机,其由上述蒸汽产生装置产生的蒸汽进行驱动;
冷凝器,其使从上述涡轮机排出的蒸汽成为冷凝水;
供水加热器,其对通过冷凝泵升压后的冷凝水进行加热;
脱气机,其对通过上述供水加热器加热后的冷凝水进行加热脱气;
脱气机水位调节阀,其调节上述脱气机的水位;
抽气系统中设置的抽气阀,该抽气系统将从上述涡轮机抽出的蒸汽导入上述供水加热器;
辅助蒸汽导入系统,其向上述供水加热器导入辅助蒸汽;
辅助蒸汽调节阀,其设置在上述辅助蒸汽导入系统中,调节向上述供水加热器供给的蒸汽量,
其特征在于,
在对上述发电设备请求急速增加负荷时,将上述抽气阀控制为关闭方向,将上述脱气机水位调节阀控制为维持开度,将上述辅助蒸汽调节阀控制为打开方向。
5.根据权利要求4所述的发电设备的输出增加控制方法,其特征在于,
测量上述供水加热器内的压力,以上述供水加热器内的压力为控制指标来控制上述辅助蒸汽调节阀的开度。
6.根据权利要求4所述的发电设备的输出增加控制方法,其特征在于,
测量流过上述抽气系统的抽出蒸汽的流量,以上述抽出蒸汽的流量作为控制指标来控制上述辅助蒸汽调节阀的开度。
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