CN112228172A - 燃煤电站炭基催化法烟气脱硫脱硝装置的再生热源系统 - Google Patents
燃煤电站炭基催化法烟气脱硫脱硝装置的再生热源系统 Download PDFInfo
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Abstract
一种燃煤电站炭基催化法烟气脱硫脱硝装置的再生热源系统,包括蒸汽系统、空气系统和蒸汽回收系统;蒸汽系统包括锅炉系统和蒸汽空气换热器,锅炉系统和蒸汽空气换热器的蒸汽入口通过再热蒸汽抽取管道连接;空气系统包括炭基催化剂再生塔加热段和高温空气循环风机,高温空气循环风机、炭基催化剂再生塔加热段和蒸汽空气换热器依次连接,形成空气循环回路;蒸汽回收系统包括主汽轮机和汽轮机回热系统,汽轮机回热系统包括依次连接的凝汽器、低压加热器和除氧器,凝汽器与主汽轮机连接,除氧器与锅炉系统连接;蒸汽空气换热器的蒸汽出口分别与低压加热器和除氧器连接。本发明提供了一种适用于燃煤电站,采用中低压蒸汽作为热源的再生热源系统。
Description
技术领域
本发明涉及一种燃煤电站炭基催化法烟气脱硫脱硝装置的再生热源系统,属于环境工程领域。
背景技术
炭基催化剂烟气脱硫脱硝技术原理为:烟气在炭基催化剂的吸附及催化作用下,烟气中的SO2和O2及H2O发生反应生成H2SO4,H2SO4吸附在炭基催化剂表面;同时利用炭基催化剂的催化性能,烟气中NOx与氨气发生催化还原反应生成N2,实现了烟气的脱硫脱硝。吸附催化反应后的炭基催化剂进行再生后循环利用。
炭基催化剂的再生工艺主要有水洗和热再生两种,但水洗再生过程将会消耗大量的水,产生酸性废水,形成二次污染,因此工业上应用最广泛、成熟的再生方法为热再生。
吸附饱和的炭基催化剂需在400℃以上的高温环境下,方能实现再生过程,因此是一个高耗能的过程。对于冶金钢铁等行业,可直接利用自身工艺产生的高炉煤气等低发热量燃料。而对于运用该技术的国外燃煤电站,采用了电能或燃料作为再生热源。对比这几种再生热源,电能是最为清洁、易得的热源之一,但作为一种高品位的能量,大量消耗会使得厂用电率急剧增长,经济性比较差。因此,对于燃煤电站来说,较为可行的较低品位的热源是中低压蒸汽和烟气,但相比于蒸汽来说,烟气系统较为复杂,抽取大量烟气对锅炉影响更大一些;另外,在机组不同负荷下,烟气参数变化较大,所需换热面积也发生了较大变化,对炭基催化法再生装置的换热段设计带来了不小的难度。
发明内容
本发明为了解决现有技术中存在的问题,提供一种适用于燃煤电站,采用中低压蒸汽作为热源的炭基催化法烟气脱硫脱硝装置的再生热源系统。
为了达到上述目的,本发明提出的技术方案为:一种燃煤电站炭基催化法烟气脱硫脱硝装置的再生热源系统,包括蒸汽系统、空气系统和蒸汽回收系统;
所述蒸汽系统包括锅炉系统和蒸汽空气换热器,所述锅炉系统和蒸汽空气换热器的蒸汽入口通过再热蒸汽抽取管道连接;
所述空气系统包括炭基催化剂再生塔加热段和高温空气循环风机,所述高温空气循环风机、炭基催化剂再生塔加热段和蒸汽空气换热器依次连接,形成空气循环回路;
所述蒸汽回收系统包括主汽轮机和汽轮机回热系统,所述汽轮机回热系统包括依次连接的凝汽器、低压加热器和除氧器,所述凝汽器与主汽轮机连接,所述除氧器与锅炉系统连接;所述蒸汽空气换热器的蒸汽出口分别与低压加热器和除氧器连接。
对上述技术方案的进一步设计为:所述蒸汽空气换热器的蒸汽出口通过换热后蒸汽排放管道连接有蒸汽减压阀装置,蒸汽减压阀装置出口分别与低压加热器和除氧器连接。
所述蒸汽回收系统还包括小汽轮机,所述蒸汽减压阀装置出口与小汽轮机连接,小汽轮机蒸汽出口与凝汽器连接。
所述蒸汽空气换热器与锅炉系统的再热蒸汽管道连接。
所述凝汽器与低压加热器之间设有轴封加热器;所述凝汽器与轴封加热器之间设有水泵。
所述除氧器与锅炉之间设有高压加热器;所述除氧器与高压加热器之间设有水泵。
所述低压加热器设有四个,四个低压加热器依次连接,所述除氧器和四个低压加热器抽取主汽轮机中压缸或低压缸蒸汽。
所述高压加热器设有三个,三个低压加热器依次连接,三个低压加热器抽取主汽轮机中压缸或高压缸蒸汽。
所述小汽轮机、除氧器和自后至前四个低压加热器的抽汽份额分别为:
式中:αxq、α4~α8、αf4、αf8、αzf、αh分别为小汽轮机抽气份额、除氧器以及四个低压加热器抽汽份额,去除氧器的轴封蒸汽份额、去最接近凝汽器的低压加热器的轴封蒸汽份额、去轴封加热器的轴封蒸汽份额、去蒸汽空气换热器抽汽份额;
q4~q8分别为除氧器以及四个低压加热器抽汽放热量;
Wxq、hh、hf4、hf8、hzf、hxq'分别为小汽轮机功率、换热后蒸汽焓、去除氧器的轴封蒸汽焓、去最接近凝汽器的低压加热器的轴封蒸汽焓、去轴封加热器的轴封蒸汽焓、小汽轮机出口蒸汽焓。
依次计算小汽轮机、除氧器和自后至前四个低压加热器的六级抽汽份额,直至计算结果为正值,则该级之前的抽汽只抽取蒸汽空气换热器的蒸汽。
本发明的有益效果为:
1、本发明为炭基催化法烟气净化技术应用于燃煤电站提供了一种可行的炭基催化法烟气脱硫脱硝装置的再生热源系统,可为炭基催化法烟气净化技术在火电行业大规模推广应用奠定基础。
2、本发明系统中,再生热源系统采用锅炉系统的再热蒸汽,为能量品位较低的中低压蒸汽,替代高品位的电能,避免了厂用电率的提高,具有良好的经济性。
3、本发明系统中,再生热源系统抽取的蒸汽量可根据机组负荷的变化而变化,并设计余热回收的方案,从而最大限度的实现节能减排效率,可以起到既减少炭基催化剂的消耗,又节省再生所需能量的目的。
4、本发明系统中,设置了蒸汽回收系统,将再生换热后的蒸汽返回汽轮机回热系统的除氧器及各级低压加热器,有利于减少高压抽气,有利于机组热效率的提高。
5、本发明系统中,设置了蒸汽回收系统,将再生换热后的蒸汽返回汽轮机回热系统的小汽轮机,有利于减少高压抽气,减少冷源损失,有利于机组热效率的提高。
附图说明
图1为本发明的再生热源系统结构示意图;
图2为本发明中蒸汽回收系统结构示意图。
图中:1-锅炉系统;2-蒸汽空气换热器;13-高温空气风机;14-炭基催化剂再生塔加热段;15-再热蒸汽抽取管道;16-换热后蒸汽排放管道;10-蒸汽减压阀装置;3-小汽轮机;4-除氧器;5-5#低压加热器;6-6#低压加热器;7-7#低压加热器;8-8#低压加热器;9-凝汽器;11-轴封加热器。
具体实施方式
下面结合附图以及具体实施例对本发明进行详细说明。
实施例
如图1所示,本实施例的一种燃煤电站炭基催化法烟气脱硫脱硝装置的再生热源系统,其特征在于:包括蒸汽系统、空气系统和蒸汽回收系统;
所述蒸汽系统包括锅炉系统1和蒸汽空气换热器2,所述锅炉系统1和蒸汽空气换热器2的蒸汽入口通过再热蒸汽抽取管道15连接;所述蒸汽空气换热器2的蒸汽出口通过换热后蒸汽排放管道16连接有蒸汽减压阀装置10,蒸汽减压阀装置10出口分别与低压加热器和除氧器连接。
所述空气系统包括炭基催化剂再生塔加热段14和高温空气循环风机13,蒸汽空气换热器2的空气出口与所述高温空气循环风机13入口连接,高温空气循环风机13出口与炭基催化剂再生塔加热段14连接,炭基催化剂再生塔加热段14与蒸汽空气换热器2空气入口连接,从而形成空气循环回路;由于炭基催化剂再生需要将炭基催化剂由80℃加热至400℃,则抽取的蒸汽在各负荷下均须在400℃以上,本实施例抽取进汽轮机中压缸前的再热蒸汽,蒸汽空气换热器2利用锅炉系统的再热蒸汽与空气换热,为炭基催化剂再生塔提供热源。
结合图2所示,所述蒸汽回收系统包括主汽轮机和汽轮机回热系统,主汽轮机设有依次连接的高压缸、中压缸和低压缸,高压缸与锅炉系统的主蒸汽管道连接,中压缸与锅炉系统的再热蒸汽管道连接,所述汽轮机回热系统包括依次连接的凝汽器9、低压加热器和除氧器4,所述凝汽器9与低压缸连接,所述除氧器4与锅炉系统连接;所述蒸汽空气换热器2的蒸汽出口分别与低压加热器和除氧器4连接。
本实施例中汽轮机回热系统中设有四个依次连接的低压加热器,分别为5#低压加热器5、6#低压加热器6、7#低压加热器7和8#低压加热器8,四个低压加热器分别从主汽轮机的中压缸或低压缸中抽汽,汽轮机回热系统中还设有三个依次连接的高压加热器,三个高压加热器分别从主汽轮机的中压缸或高压缸中抽汽。
本实施例中所述蒸汽回收系统还包括小汽轮机3,所述蒸汽减压阀装置10出口与小汽轮机3连接,小汽轮机蒸汽出口与凝汽器连接。
本实施例蒸汽空气换热器2所抽取的再热蒸汽压力较大,其在蒸汽空气换热器2中蒸汽压降极小,因此需在进入小汽轮机3或除氧器4及各级低压加热器5-8的换热后蒸汽排放管道上加装蒸汽减压阀10,以便其能顺利自行进入,并对小汽轮机3或除氧器4及各级低压加热器工作压力不造成影响。
本实施例中的汽轮机回热系统所述凝汽器9与低压加热器之间设有轴封加热器11,凝汽器9与轴封加热器11之间还设有水泵。
本实施例中所述高压加热器设置于除氧器4与锅炉系统1之间,所述除氧器4与高压加热器之间也设有水泵。
由于炭基催化剂再生所需热量会随机组负荷变化而变化,因此本实施例可根据机组负荷的变化,针对炭基催化法再生塔加热段进行热力计算,改变抽取再热蒸汽的量,从而控制炭基催化剂再生热量,达到既减少炭基催化剂的消耗,又节省再生所需能量的目的。本实施例提出的蒸汽回收系统的设计方法,即按照等效焓降法对汽轮机回热系统进行热力计算,控制主蒸汽参数以及再热蒸汽参数不变,对各级加热器列热平衡方程计算各级抽汽量,蒸汽返回小汽轮机3或除氧器4,多余的蒸汽可排挤其后的各级低压加热器5-8抽气,秉持尽可能排挤压力等级高的抽气原则,各级加热器热平衡方程计算式分别见式(1)-(6):
式中:αxq、α4~α8、αf4、αf8、αzf、αh分别为小汽轮机抽气份额、除氧器以及四个低压加热器抽汽份额,去除氧器的轴封蒸汽份额、去最接近凝汽器的低压加热器的轴封蒸汽份额、去轴封加热器的轴封蒸汽份额、去蒸汽空气换热器抽汽份额;
q4~q8分别为除氧器以及四个低压加热器抽汽放热量;
Wxq、hh、hf4、hf8、hzf、hxq'分别为小汽轮机功率、换热后蒸汽焓、去除氧器的轴封蒸汽焓、去最接近凝汽器的低压加热器的轴封蒸汽焓、去轴封加热器的轴封蒸汽焓、小汽轮机出口蒸汽焓。
由于本实施例中小汽轮机3、除氧器4和四级低压加热器均可以从主汽轮机和蒸汽空气换热器中抽取蒸汽,本实施例中优选抽取蒸汽空气换热器中的蒸汽;蒸汽回收系统各级抽汽的具体计算方法为,当蒸汽空气换热器返回蒸汽回收系统蒸汽的热量仅需排挤小汽轮机抽汽就能满足回热系统热平衡时采用式(1)计算小汽轮机抽汽份额,当返回蒸汽的热量排挤完小汽轮机抽汽且需要排挤部分除氧器4抽汽时采用式(2)计算除氧器4抽汽份额,当返回蒸汽的热量排挤完4#低压加热器抽汽且需要排挤部分5#低压加热器抽汽时采用式(3)计算5#低压加热器抽汽份额,并以此类推。
其中,蒸汽空气换热器返回蒸汽回收系统蒸汽的热量排挤各级抽汽的判断标准如下,若排挤完小汽轮机抽汽还需排挤除氧器4抽气,则式(1)的计算结果αxq为负;若排挤完除氧器4抽汽还需排挤5#加热器,则式(2)的计算结果α4为负。依次计算(1)-(6)式,第一次出现某级抽汽份额的计算结果为正时则停止计算,则该级之前从主汽轮机抽汽的抽汽份额均为0只需从蒸汽空气换热器中抽汽,该级抽汽之后的各级抽汽份额不受影响。若这六级抽汽份额计算结果均为负,说明蒸汽空气换热器换热后返回蒸汽回收系统的蒸汽量足够排挤回热系统抽气总额,则无需另外从中压缸或低压缸抽取蒸汽。
本发明的技术方案不局限于上述各实施例,凡采用等同替换方式得到的技术方案均落在本发明要求保护的范围内。
Claims (10)
1.一种燃煤电站炭基催化法烟气脱硫脱硝装置的再生热源系统,其特征在于:包括蒸汽系统、空气系统和蒸汽回收系统;
所述蒸汽系统包括锅炉系统和蒸汽空气换热器,所述锅炉系统和蒸汽空气换热器的蒸汽入口通过再热蒸汽抽取管道连接;
所述空气系统包括炭基催化剂再生塔加热段和高温空气循环风机,所述高温空气循环风机、炭基催化剂再生塔加热段和蒸汽空气换热器依次连接,形成空气循环回路;
所述蒸汽回收系统包括主汽轮机和汽轮机回热系统,所述汽轮机回热系统包括依次连接的凝汽器、低压加热器和除氧器,所述凝汽器与主汽轮机连接,所述除氧器与锅炉系统连接;所述蒸汽空气换热器的蒸汽出口分别与低压加热器和除氧器连接。
2.根据权利要求1所述燃煤电站炭基催化法烟气脱硫脱硝装置的再生热源系统,其特征在于:所述蒸汽空气换热器的蒸汽出口通过换热后蒸汽排放管道连接有蒸汽减压阀装置,蒸汽减压阀装置出口分别与低压加热器和除氧器连接。
3.根据权利要求2所述燃煤电站炭基催化法烟气脱硫脱硝装置的再生热源系统,其特征在于:所述蒸汽回收系统还包括小汽轮机,所述蒸汽减压阀装置出口与小汽轮机连接,小汽轮机蒸汽出口与凝汽器连接。
4.根据权利要求3所述燃煤电站炭基催化法烟气脱硫脱硝装置的再生热源系统,其特征在于:所述蒸汽空气换热器与锅炉系统的再热蒸汽管道连接。
5.根据权利要求4所述燃煤电站炭基催化法烟气脱硫脱硝装置的再生热源系统,其特征在于:所述凝汽器与低压加热器之间设有轴封加热器;所述凝汽器与轴封加热器之间设有水泵。
6.根据权利要求5所述燃煤电站炭基催化法烟气脱硫脱硝装置的再生热源系统,其特征在于:所述除氧器与锅炉之间设有高压加热器;所述除氧器与高压加热器之间设有水泵。
7.根据权利要求6所述燃煤电站炭基催化法烟气脱硫脱硝装置的再生热源系统,其特征在于:所述低压加热器设有四个,四个低压加热器依次连接,所述除氧器和四个低压加热器抽取主汽轮机中压缸或低压缸蒸汽。
8.根据权利要求7所述燃煤电站炭基催化法烟气脱硫脱硝装置的再生热源系统,其特征在于:所述高压加热器设有三个,三个低压加热器依次连接,三个低压加热器抽取主汽轮机中压缸或高压缸蒸汽。
9.根据权利要求8所述燃煤电站炭基催化法烟气脱硫脱硝装置的再生热源系统,其特征在于:所述小汽轮机、除氧器和自后至前四个低压加热器的抽汽份额分别为:
式中:αxq、α4~α8、αf4、αf8、αzf、αh分别为小汽轮机抽气份额、除氧器以及四个低压加热器抽汽份额,去除氧器的轴封蒸汽份额、去最接近凝汽器的低压加热器的轴封蒸汽份额、去轴封加热器的轴封蒸汽份额、去蒸汽空气换热器抽汽份额;
q4~q8分别为除氧器以及四个低压加热器抽汽放热量;
Wxq、hh、hf4、hf8、hzf、hxq'分别为小汽轮机功率、换热后蒸汽焓、去除氧器的轴封蒸汽焓、去最接近凝汽器的低压加热器的轴封蒸汽焓、去轴封加热器的轴封蒸汽焓、小汽轮机出口蒸汽焓。
10.根据权利要求9所述燃煤电站炭基催化法烟气脱硫脱硝装置的再生热源系统,其特征在于:依次计算小汽轮机、除氧器和自后至前四个低压加热器的六级抽汽份额,直至计算结果为正值,则该级之前的抽汽只抽取蒸汽空气换热器的蒸汽。
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