CN110433628A - 一种燃煤烟气尘硫硝汞一体化协同脱除的***与方法 - Google Patents
一种燃煤烟气尘硫硝汞一体化协同脱除的***与方法 Download PDFInfo
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Abstract
本发明公开了一种燃煤烟气尘硫硝汞一体化协同脱除的***与方法,属于工业废气净化环保及能源领域。本发明***包括锅炉,锅炉通过烟道与半干法反应器连通,半干法反应器与旋风分离器连接,旋风分离器与除尘器连接,除尘器通过引风机与烟囱连通。本发明通过亚氯酸钠分级氧化燃煤烟气中的NO与Hg,然后采用生石灰作为吸收剂在循环流化床半干法反应器内吸收烟气中的硫硝汞,然后在布袋除尘器内实现尘硫硝汞的一体化高效协同脱除,具有***简单可靠、投资及运行费用低、占地面积小等优点,能够产生良好的经济效益与环保效益。
Description
技术领域
本发明属于工业废气净化环保及能源领域,特别涉及一种燃煤烟气尘硫硝汞一体化协同脱除的***与方法。
背景技术
我国以煤为主的能源结构在相当长时间内不会改变,因此,控制燃煤烟气中的烟尘、SO2、SO3、NOx、Hg等污染物排放是我国治理大气污染的一项重要工作。目前进入工业应用的燃煤烟气污染物控制方法包括SCR脱硝、石灰石~石膏湿法脱硫、电除尘器、布袋除尘器、活性炭吸附脱汞等,虽然各种技术叠加使用能够有效控制污染物排放浓度,但由此带来燃煤电厂环保设施投资与占地面积大、运行费用高、运行维护工作量大等问题。因此,开发能够实现尘硫硝汞一体化协同脱除的技术,是当前燃煤烟气污染物控制技术领域亟待解决的技术难题。
与本发明相关的中国专利,如CN 103566725 B——《一种循环流化床半干法联合脱硫脱硝脱汞装置及方法》,是通过向烟道内喷入臭氧,对烟气中的NO与Hg进行氧化,然后进入循环流化床半干法反应器实现脱除。但采用臭氧作为氧化剂,在实际工程应用中存在氧化剂利用效率不高,***能耗成本过高的问题。
再如CN 101785965 B——《一种络合吸收循环半干法脱硫脱硝一体化工艺及装置》,是通过先向烟气中喷射碱性络合剂吸收烟气中的SO2与NO,然后进入循环流化床半干法反应器实现脱除。但该碱性络合剂仅对SO2与NO具有络合吸收作用,而对烟气中不易脱除的Hg不具备吸收作用,无法实现Hg的有效脱除。
发明内容
本发明的目的是针对当前燃煤电厂环保设施叠加使用,投资与占地面积大、运行费用高、运行维护工作量大等问题,提出一种燃煤烟气尘硫硝汞一体化协同脱除的***与方法。
本发明解决上述问题所采用的技术方案是:一种燃煤烟气尘硫硝汞一体化协同脱除的***,包括锅炉,其特征是,所述锅炉通过烟道与半干法反应器连通,所述半干法反应器与旋风分离器连接,所述旋风分离器与除尘器连接,所述除尘器通过引风机与烟囱连通;所述烟道和半干法反应器内均设置有氧化剂喷嘴,所述氧化剂喷嘴与氧化剂溶液罐通过管道连通;所述半干法反应器内还设置有吸收剂喷嘴,所述吸收剂喷嘴与吸收剂罐通过管道连通,所述吸收剂罐与旋风分离器通过管道连通;所述旋风分离器和除尘器均与灰库连通。
进一步的,在半干法反应器内,所述氧化剂喷嘴设置有多个,且多个氧化剂喷嘴从上到下分层布置。
进一步的,所述吸收剂喷嘴设置在氧化剂喷嘴的下方,且氧化剂喷嘴位于半干法反应器的烟气进口的上方。
所述的燃煤烟气尘硫硝汞一体化协同脱除的***的工作方法如下,烟气从锅炉排出后,首先在烟道内与喷入的氧化剂发生预氧化反应,然后进入半干法反应器;吸收剂罐内的吸收剂经压缩空气喷入半干法反应器内,在烟气的作用下呈悬浮流化状态,吸附硫硝汞;氧化剂经氧化剂喷嘴分级雾化喷入半干法反应器内,使烟气中的硫硝汞发生氧化反应,促进吸收剂的吸收;烟气从半干法反应器排出后,再进入旋风分离器分离出大部分固体颗粒,分离出的固体颗粒大部分重新进入吸收剂罐循环使用,剩余的固体颗粒通过气力输送至灰库;烟气随后进入布袋除尘器进行除尘,同步脱除硫硝汞,再经引风机进入烟囱,最终实现污染物达标排放。
进一步的,所述氧化剂为亚氯酸钠,吸收剂为生石灰。
进一步的,喷入烟道内的亚氯酸钠溶液PH值控制在3~6之间,与烟气中硝汞的摩尔比控制在0.5~1之间。
进一步的,喷入半干法反应器内的亚氯酸钠溶液PH值控制在1~3之间,与烟气中硝汞的摩尔比控制在1~3之间。
进一步的,喷入半干法反应器内的生石灰与烟气中硫硝的摩尔比控制在1.1~2.0之间。
进一步的,所述旋风分离器的分离效率为99%以上,旋风分离器分离出的固体颗粒中有80%~90%重新进入吸收剂罐,剩余的固体颗粒通过气力输送至灰库。
本发明与现有技术相比,具有以下优点和效果:通过上述***,可对烟气中的尘硫硝汞等污染物进行一体化协同脱除,具有***简单可靠、投资及运行费用低、占地面积小等优点,能够产生良好的经济效益与环保效益。
附图说明
图1是本发明实施例的结构示意图。
图中:锅炉1、烟道2、半干法反应器3、旋风分离器4、除尘器5、引风机6、烟囱7、氧化剂溶液罐8、灰库9、氧化剂喷嘴10、吸收剂喷嘴11、吸收剂罐12。
具体实施方式
下面结合附图并通过实施例对本发明作进一步的详细说明,以下实施例是对本发明的解释而本发明并不局限于以下实施例。
参见图1,本实施例中的燃煤烟气尘硫硝汞一体化协同脱除的***,包括锅炉1,锅炉1通过烟道2与半干法反应器3连通,半干法反应器3与旋风分离器4连接,旋风分离器4与除尘器5连接,除尘器5通过引风机6与烟囱7连通;烟道2和半干法反应器3内均设置有氧化剂喷嘴10,氧化剂喷嘴10与氧化剂溶液罐8通过管道连通;半干法反应器3内还设置有吸收剂喷嘴11,吸收剂喷嘴11与吸收剂罐12通过管道连通,吸收剂罐12与旋风分离器4通过管道连通;在半干法反应器3内,氧化剂喷嘴10设置有多个,且多个氧化剂喷嘴10从上到下分层布置;吸收剂喷嘴11设置在氧化剂喷嘴10的下方,且氧化剂喷嘴10位于半干法反应器3的烟气进口的上方;旋风分离器4和除尘器5均与灰库9连通。
工作方法如下,烟气从锅炉1排出后,首先在烟道2内与喷入的氧化剂发生预氧化反应,然后进入半干法反应器3;吸收剂罐12内的吸收剂经压缩空气喷入半干法反应器3内,在烟气的作用下呈悬浮流化状态,吸附硫硝汞;氧化剂经氧化剂喷嘴10分级雾化喷入半干法反应器3内,使烟气中的硫硝汞发生氧化反应,促进吸收剂的吸收;烟气从半干法反应器3排出后,再进入旋风分离器4分离出大部分固体颗粒,分离出的固体颗粒大部分重新进入吸收剂罐12循环使用,剩余的固体颗粒通过气力输送至灰库9;烟气随后进入布袋除尘器5进行除尘,同步脱除硫硝汞,再经引风机6进入烟囱7,最终实现污染物达标排放。
其中,氧化剂为亚氯酸钠,吸收剂为生石灰。
喷入烟道2内的亚氯酸钠溶液PH值控制在3~6之间,与烟气中硝汞的摩尔比控制在0.5~1之间。
喷入半干法反应器3内的亚氯酸钠溶液PH值控制在1~3之间,与烟气中硝汞的摩尔比控制在1~3之间。
喷入半干法反应器3内的生石灰与烟气中硫硝的摩尔比控制在1.1~2.0之间。
旋风分离器4的分离效率为99%以上,旋风分离器4分离出的固体颗粒中有80%~90%重新进入吸收剂罐12,剩余的固体颗粒通过气力输送至灰库9。
虽然本发明以实施例公开如上,但其并非用以限定本发明的保护范围,任何熟悉该项技术的技术人员,在不脱离本发明的构思和范围内所作的更改,均应属于本发明的保护范围。
Claims (9)
1.一种燃煤烟气尘硫硝汞一体化协同脱除的***,包括锅炉(1),其特征是,所述锅炉(1)通过烟道(2)与半干法反应器(3)连通,所述半干法反应器(3)与旋风分离器(4)连接,所述旋风分离器(4)与除尘器(5)连接,所述除尘器(5)通过引风机(6)与烟囱(7)连通;所述烟道(2)和半干法反应器(3)内均设置有氧化剂喷嘴(10),所述氧化剂喷嘴(10)与氧化剂溶液罐(8)通过管道连通;所述半干法反应器(3)内还设置有吸收剂喷嘴(11),所述吸收剂喷嘴(11)与吸收剂罐(12)通过管道连通,所述吸收剂罐(12)与旋风分离器(4)连通;所述旋风分离器(4)和除尘器(5)均与灰库(9)连通。
2.根据权利要求1所述的燃煤烟气尘硫硝汞一体化协同脱除的***,其特征是,在半干法反应器(3)内,所述氧化剂喷嘴(10)设置有多个,且多个氧化剂喷嘴(10)从上到下分层布置。
3.根据权利要求2所述的燃煤烟气尘硫硝汞一体化协同脱除的***,其特征是,所述吸收剂喷嘴(11)设置在氧化剂喷嘴(10)的下方,且氧化剂喷嘴(10)位于半干法反应器(3)的烟气进口的上方。
4.一种如权利要求1~3中任一项所述的燃煤烟气尘硫硝汞一体化协同脱除的***的工作方法,其特征是,烟气从锅炉(1)排出后,首先在烟道(2)内与喷入的氧化剂发生预氧化反应,然后进入半干法反应器(3);吸收剂罐(12)内的吸收剂经压缩空气喷入半干法反应器(3)内,在烟气的作用下呈悬浮流化状态,吸附硫硝汞;氧化剂经氧化剂喷嘴(10)分级雾化喷入半干法反应器(3)内,使烟气中的硫硝汞发生氧化反应,促进吸收剂的吸收;烟气从半干法反应器(3)排出后,再进入旋风分离器(4)分离出大部分固体颗粒,分离出的固体颗粒大部分重新进入吸收剂罐(12)循环使用,剩余的固体颗粒通过气力输送至灰库(9);烟气随后进入布袋除尘器(5)进行除尘,同步脱除硫硝汞,再经引风机(6)进入烟囱(7),最终实现污染物达标排放。
5.根据权利要求4所述的燃煤烟气尘硫硝汞一体化协同脱除的***的工作方法,其特征是,所述氧化剂为亚氯酸钠,吸收剂为生石灰。
6.根据权利要求5所述的燃煤烟气尘硫硝汞一体化协同脱除的***的工作方法,其特征是,喷入烟道(2)内的亚氯酸钠溶液PH值控制在3~6之间,与烟气中硝汞的摩尔比控制在0.5~1之间。
7.根据权利要求5所述的燃煤烟气尘硫硝汞一体化协同脱除的***的工作方法,其特征是,喷入半干法反应器(3)内的亚氯酸钠溶液PH值控制在1~3之间,与烟气中硝汞的摩尔比控制在1~3之间。
8.根据权利要求5所述的燃煤烟气尘硫硝汞一体化协同脱除的***的工作方法,其特征是,喷入半干法反应器(3)内的生石灰与烟气中硫硝的摩尔比控制在1.1~2.0之间。
9.根据权利要求4所述的燃煤烟气尘硫硝汞一体化协同脱除的***的工作方法,其特征是,所述旋风分离器(4)的分离效率为99%以上,旋风分离器(4)分离出的固体颗粒中有80%~90%重新进入吸收剂罐(12),剩余的固体颗粒通过气力输送至灰库(9)。
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