CN107837679A - 烟气制碳氢燃料协同脱硫方法及实现该方法的光催化装置 - Google Patents
烟气制碳氢燃料协同脱硫方法及实现该方法的光催化装置 Download PDFInfo
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Abstract
本发明属于烟气净化技术领域,并公开了烟气制碳氢燃料协同脱硫方法及实现该方法的光催化装置,该方法是在富氧燃烧电厂静电除尘器和烟气冷凝与CO2压缩装置之间,对烟气中的CO2进行光催化还原并同时对烟气中的SO2进行氧化脱除。该装置包括反应单元和分离单元,所述反应单元包括反应容器,反应容器内设置有搅拌装置、碳酸氢盐溶液和悬浮在所述碳酸氢盐溶液中的光催化剂,所述反应容器上分别设有烟气入口、气体出口、液体出口和液体入口,所述反应容器的顶端设置有石英玻璃盖板;所述分离单元为一离心萃取装置。本发明可利用太阳能同时实现富氧燃烧烟气转化利用及烟气的脱硫,且具有能耗小、成本低等优点,对富氧燃烧技术的推广应用具有重要意义。
Description
技术领域
本发明属于烟气净化技术领域,更具体地,涉及脱硫方法及实现该方法的光催化装置。
背景技术
煤炭是我国能源的基石,我国能源消耗的60%以上来自煤炭。燃煤电厂是我国CO2排放量最大,最集中的排放源。富氧燃烧技术采用纯氧和循环烟气混合后代替空气作为助燃剂参与燃烧,生成的烟气中CO2浓度可达80%以上并实现了CO2的捕集。该技术具有可规模化及可改造存量机组等优点,但是由于成本依然较高,限制了其大规模推广。如能对捕获后的CO2加以利用,势必对富氧燃烧技术的推广应用具有重要促进意义。随着光催化技术的发展,CO2光催化还原技术受到越来越多科研人员的重视。CO2光催化还原技术是利用太阳光激发光催化材料产生光生电子空穴对,使得CO2与水在常温常压下转化为甲烷、甲醇等碳氢燃料,以实现CO2的资源化利用的手段。该技术具有能耗低、无污染等优点,是一项极有潜力的碳减排及资源化利用技术。由于采用烟气循环,富氧燃烧烟气中SO2等污染物会发生富集。传统的烟气处理方式,如湿法脱硫技术,虽可实现SO2的高效脱除,但是仍然存在能耗大、成本高等不足之处。
发明内容
针对现有技术的以上缺陷或改进需求,本发明提供了富氧燃烧烟气光催化制取碳氢燃料协同脱硫方法及实现该方法的装置,能同时实现富氧燃烧烟气转化利用及烟气脱硫。
为实现上述目的,按照本发明的一个方面,提供了富氧燃烧电厂烟气制碳氢燃料协同脱硫方法,其特征在于,在富氧燃烧电厂静电除尘器和烟气冷凝与CO2压缩装置之间,对烟气中的CO2进行光催化还原并同时对烟气中的SO2进行氧化脱除。
按照本发明的另一个方面,还提供了实现上述方法的光催化装置,其特征在于,包括反应单元和分离单元,其中,
所述反应单元包括上端敞口的反应容器,所述反应容器的内底面设置有搅拌装置,所述反应容器内设置有混合液,所述混合液包括碳酸氢盐溶液和悬浮在所述碳酸氢盐溶液中的光催化剂,所述反应容器上分别设有烟气入口、气体出口、液体出口和液体入口,所述反应容器的顶端设置有石英玻璃盖板,以保证光催化反应所需的光照进入所述反应容器;
所述分离单元为一离心萃取装置,并且所述分离单元与所述反应容器的液体出口相连,以用于获得CO2进行光催化还原形成的液态碳氢产物,此外,所述分离单元还与所述反应容器的液体入口相连,以用于将分离了液态碳氢产物的混合液再输送回所述反应容器内。
优选地,所述光催化剂为TiO2、ZnO、CeO2中的一种或多种。
总体而言,通过本发明所构思的以上技术方案与现有技术相比,能够取得下列有益效果:
本发明提出了富氧燃烧烟气光催化制取碳氢燃料协同脱硫方法及装置,通过催化剂使富氧燃烧烟气中高浓度的CO2还原为碳氢化合物,并同时使烟气中SO2被氧化为SO3后被反应液吸收脱除。所采用的催化剂,在能量高于半导体禁带宽度的光照射到催化剂表面时,就会激发半导体内的电子从价带跃迁至导带,形成具有很强活性的电子空穴对,其中光生电子可将CO2还原为碳氢化合物,光生空穴则可将SO2氧化为SO3,便于SO2的吸收脱除。因此,本发明方法及装置可利用太阳能同时实现富氧燃烧烟气转化利用及烟气的脱硫,且具有能耗小、成本低等优点,对富氧燃烧技术的推广应用具有重要意义。
附图说明
图1为本发明用于富氧燃烧电厂烟气制碳氢燃料协同脱硫流程示意图;
图2为本发明用于燃煤富氧燃烧烟气制碳氢燃料协同脱硫效果图。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白,以下结合附图及实施例,对本发明进行进一步详细说明。应当理解,此处所描述的具体实施例仅仅用以解释本发明,并不用于限定本发明。此外,下面所描述的本发明各个实施方式中所涉及到的技术特征只要彼此之间未构成冲突就可以相互组合。
参照图1,在富氧燃烧电厂的锅炉1旁设有静电除尘器2,静电除尘器2和烟气冷凝与CO2压缩装置之间,设置一个将烟气中的CO2还原为碳氢燃料并同时实现烟气脱硫的光催化装置3,以取代传统脱硫装置。
本发明采用的光催化装置3包括反应单元5和分离单元4,其中,
所述反应单元5包括上端敞口的反应容器51,所述反应容器51的内底面设置有搅拌装置53,所述反应容器51内设置有混合液,所述混合液包括碳酸氢盐溶液52和悬浮在所述碳酸氢盐溶液中的光催化剂,优选地,碳酸氢盐溶液可以选择碳酸氢钠溶液,所述光催化剂为TiO2、ZnO、CeO2中的一种或多种。所述反应容器51上分别设有烟气入口、气体出口、液体出口和液体入口,所述反应容器51的顶端设置有石英玻璃盖板54,以保证光催化反应所需的光照进入所述反应容器51;
所述分离单元4为一离心萃取装置,并且所述分离单元4与所述反应容器51的液体出口相连,以用于获得CO2进行光催化还原形成的液态碳氢产物,此外,所述分离单元4还与所述反应容器51的液体入口相连,以用于将分离了液态碳氢产物的混合液再输送回所述反应容器51内。
烟气经管道直接通入反应容器51中的碳酸氢盐溶液52中,并在光照条件下被溶液中的催化剂催化。反应容器51的底部的搅拌装置53确保光催化剂与通入的烟气充分接触。
反应后的液体经液体出口排出后,通过离心萃取装置分离即得到其中的甲醇等液态碳氢产物,剩余的溶液则被输送回反应容器51中。
进一步地,光催化反应后的烟气中含有CO、CH4、CO2和水蒸气等成分。烟气从反应容器51的气体出口排出后,首先通入烟气冷凝与CO2压缩装置,除去其中的水蒸气和CO2。一方面,压缩的CO2被存储起来;另一方面,剩余的烟气经分离与净化,得到所需的CO和CH4等产物。
参照图2,烟气中SO2脱除效率可保持在90%以上,同时SO2的加入可显著提升CO2还原效率,从而实现了富氧烟气制碳氢燃料及脱硝协同进行。
本领域的技术人员容易理解,以上所述仅为本发明的较佳实施例而已,并不用以限制本发明,凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等,均应包含在本发明的保护范围之内。
Claims (3)
1.烟气制碳氢燃料协同脱硫方法,其特征在于,在富氧燃烧电厂静电除尘器和烟气冷凝与CO2压缩装置之间,对烟气中的CO2进行光催化还原并同时对烟气中的SO2进行氧化脱除。
2.实现权利要求1所述方法的光催化装置,其特征在于,包括反应单元和分离单元,其中,
所述反应单元包括上端敞口的反应容器,所述反应容器的内底面设置有搅拌装置,所述反应容器内设置有混合液,所述混合液包括碳酸氢盐溶液和悬浮在所述碳酸氢盐溶液中的光催化剂,所述反应容器上分别设有烟气入口、气体出口、液体出口和液体入口,所述反应容器的顶端设置有石英玻璃盖板,以保证光催化反应所需的光照进入所述反应容器;
所述分离单元为一离心萃取装置,并且所述分离单元与所述反应容器的液体出口相连,以用于获得CO2进行光催化还原形成的液态碳氢产物,此外,所述分离单元还与所述反应容器的液体入口相连,以用于将分离了液态碳氢产物的混合液再输送回所述反应容器内。
3.根据权利要求2所述的光催化装置,其特征在于,所述光催化剂为TiO2、ZnO、CeO2中的一种或多种。
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