CN111482083A - 一种无需外部能耗的危废焚烧scr设备 - Google Patents
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Abstract
本发明公开了一种无需外部能耗的危废焚烧SCR设备,其包括氨水输送系统、氨水蒸发系统、GSH蒸汽加热器、GGH烟气换热器及主设备SCR反应器;所述氨水输送系统通过输送泵将氨水溶液送至氨水蒸发系统的双流体雾化喷枪,所述GSH蒸汽加热器与氨水蒸发系统的氨水蒸发器连接,GSH蒸汽加热器出来的烟气通过氨水蒸发器进入SCR反应器内;所述SCR反应器的烟气出口与GGH烟气换热器连接,所述GGH烟气换热器利用SCR反应器出口的高温烟气对湿电除雾器出口的低温烟气进行加热。本发明充分利用焚烧系统的热能无需额外加热能即能达到SCR催化温度,极大程度上减少了企业的运行成本。
Description
技术领域
本发明涉及一种无需外部能耗的危废焚烧SCR设备,属于节能环保技术领域。
背景技术
危险废物焚烧炉项目环保要求越来越严格,氮氧化物的超低排放是往后环保的必经之路,焚烧系统单靠SNCR高温脱硝很难达标,因此SCR低温脱硝应用于了该领域,SCR的应用同时可去除二恶英等有害物,确保企业环保的达标排放。
目前低温催化系统SCR正常催化温度在200--240℃左右,在危废焚烧系统热能利用中需要避开二恶英再生的高温区域,故一般在SCR的高温段需辅助燃料来燃烧升温。
发明内容
为了使危险废物焚烧尾气既能满足污染控制标准要求,又能减轻企业的运行成本,本发明提供了一种无需外部能耗的危废焚烧SCR设备。
本发明采取的技术方案是:一种无需外部能耗的危废焚烧SCR设备,其包括氨水输送系统、氨水蒸发系统、GSH蒸汽加热器、GGH烟气换热器及主设备SCR反应器;所述氨水输送系统与氨水蒸发系统连接,氨水输送系统通过输送泵将氨水溶液送至氨水蒸发系统的双流体雾化喷枪,所述GSH蒸汽加热器与氨水蒸发系统的氨水蒸发器连接,GSH蒸汽加热器出来的烟气通过氨水蒸发器进入SCR反应器内;所述SCR反应器的烟气出口与GGH烟气换热器连接,所述GGH烟气换热器利用SCR反应器出口的高温烟气对湿电除雾器出口的低温烟气进行加热。
进一步的,所述氨水输送系统包括氨水储存罐,变频计量隔膜泵,流量计、调节阀、回流阀及管阀仪表,所述变频计量隔膜泵将氨水储存罐中氨水溶液抽出、计量、加压后送到双流体雾化喷枪。
进一步的,所述蒸发系统包括氨水蒸发器、氨水溶液双流体雾化喷枪、压缩空气管路和减压阀,压缩空气经压缩空气管路并通过减压阀调压后送到双流体雾化喷枪,氨水溶液在压缩空气的引射作用下喷出,压缩空气和氨水溶液混合后经喷嘴雾化后喷入氨水蒸发器,氨水溶液在其中迅速蒸发气化成氨、水的烟气混合物,并与蒸发器内的烟气混合均匀进入烟气整流格栅。
进一步的,所述SCR反应器包括SCR反应器本体以及设于本体内的反应器流场优化装置,整流装置和催化剂层。其中,所述SCR反应器本体内从上往下设有整流格栅和多层催化剂层,并且反应器中烟气竖直向下流动;所述整流格栅设于反应器入口处,用于保证氨喷射系统前烟气流动的均匀性,烟气进入第一层催化剂前的烟气温度分布、速度分布的均匀性以及烟气流出最后一层催化剂的NOx浓度分布和氨浓度分布的均匀性。
进一步的,所述GSH蒸汽加热器包括热管式模块、蒸汽流量压力控制系统、冷凝水排放控制系统,余热锅炉过热蒸汽(300℃的高温蒸汽)通过压力控制系统计量进入GSH蒸汽加热器内经热管式模块后回流冷凝水排出GSH蒸汽加热器,回流冷凝水温度控制在170℃左右,GGH蒸汽加热器出来的烟气温度由150℃升至220℃左右通过氨水蒸发器进入SCR反应器内。
进一步的,所述GGH烟气换热器包括壳体和热管式换热器,GGH烟气换热器是利用SCR反应器口的高温烟气对湿电除雾器出口低温烟气进行加热,使烟气温度从60℃升至150℃,可以大幅降低运行中对烟气升温所消耗的蒸汽,降低运行成本。其中,热管式换热器,分二组设计,分别为GGH的低温组热管和高温组热管。GGH的低温组热管采用不锈钢材质(基管2205与翅片316L材质)以避免腐蚀,高温组的热管材质为碳钢,壳体板与烟气接触的部分考虑高温防腐。
本发明的有益效果是:本发明利用本焚烧系统产生的高温过热蒸汽来作为高温段GSH烟气升温的热源,SCR出来的高温烟气作为低温段烟气的加热器GGH的热源。充分利用焚烧系统的热能无需额外加热能即能达到SCR催化温度,极大程度上减少了企业的运行成本。
本发明的附加方面和优点将在下面的描述中部分给出,部分将从下面的描述中变得明显,或通过本发明的实践了解到。
附图说明
图1是本发明的主工艺流程示意图。
图中标记为:1-氨水储存罐,2-氨水输送泵,3-氨水回流阀,4-氨水调节阀,5-氨水流量计,6-压缩空气,7-调压阀,8-余热锅炉过热蒸汽,9-蒸汽稳压阀,10-回流冷凝水,11-系统经脱酸除雾烟气,12-氨水蒸发器,13-氨水雾化喷枪,14-GSH蒸汽加热器,15-整流格栅,16-第一催化剂层,17-第二催化剂层,18-第三催化剂层,19-SCR反应器,20-GGH烟气换热器,21-尾气排放。
具体实施方式
下面结合附图和具体实施例对本发明进行详细说明。
如图1所示,一种无需外部能耗的危废焚烧SCR设备,包括氨水输送系统、氨水蒸发系统、蒸汽加热系统、GGH烟气换热器及主设备SCR反应器。其中:
氨水输送系统包括:氨水储存罐1、氨水输送泵2、氨水回流阀3、氨水调节阀4、氨水流量计5。
主设备SCR反应器19包括:SCR反应器本体、整流格栅15、催化剂层16-18。
氨水蒸发系统包括:氨水蒸发器12、氨水雾化喷枪13、压缩空气6、调压阀7。
蒸汽加热系统包括:GSH蒸汽加热器、余热锅炉过热蒸汽8、蒸汽稳压阀9、回流冷凝水10。
所述氨水输送系统中,氨水溶液输送泵2(有备用)采用变频计量隔膜泵,氨水溶液由氨水储罐1中抽出,计量、加压后送到双流体雾化喷枪13,压缩空气6经调压阀7调压后也送到计量喷枪,在压缩空气的引射作用下,混合后经喷嘴雾化后喷入氨水蒸发器12。所述氨水蒸发器12,氨水溶液在其中迅速蒸发气化成氨、水的烟气混合物,并与氨水蒸发器中的烟气混合均匀(在蒸发器中设置特殊设计的混流设备)进入烟气整流格栅15。所述SCR反应器19设计三层催化剂层16-18(备用一层空间),SCR反应器19设计成烟气竖直向下流动,SCR反应器19入口将设气流均布装置即整流格栅15,保证氨喷射系统前烟气流动的均匀性,烟气进入第一层催化剂层16前的烟气温度分布、速度分布的均匀性以及烟气流出最后一层催化剂18的NOx浓度分布和氨浓度分布的均匀性。所述GGH烟气换热器20是利用SCR反应器19出口的高温烟气对湿电除雾器出口低温烟气进行加热,使烟气温度从60℃升至150℃,可以大幅降低运行中对烟气升温所消耗的蒸汽,降低运行成本。GGH烟气换热器采用热管式换热器,分二组设计,GGH烟气换热器20的低温组热管采用不锈钢材质(基管2205与翅片316L材质)以避免腐蚀,GGH烟气换热器20高温组的热管材质为碳钢,壳体板与烟气接触的部分考虑高温防腐。所述氨水蒸发系统中,余热锅炉过热蒸汽8(300℃的高温蒸汽)通过压力控制系统计量进入GSH蒸汽加热器14内经热管式模块后回流冷凝水10排出GSH蒸汽加热器14,回流冷凝水10温度控制在170℃左右,GGH蒸汽加热器14出来的烟气温度由150℃升至220℃左右通过氨水蒸发器12进入SCR反应器19内;
以上显示和描述了本发明的基本原理、主要特征和优点。本领域的普通技术人员应该了解,上述实施例不以任何形式限制本发明的保护范围,凡采用等同替换等方式所获得的技术方案,均落于本发明的保护范围内。
本发明未涉及部分均与现有技术相同或可采用现有技术加以实现。
Claims (8)
1.一种无需外部能耗的危废焚烧SCR设备,其特征在于,包括氨水输送系统、氨水蒸发系统、GSH蒸汽加热器、GGH烟气换热器及主设备SCR反应器;所述氨水输送系统与氨水蒸发系统连接,氨水输送系统通过输送泵将氨水溶液送至氨水蒸发系统的双流体雾化喷枪,所述GSH蒸汽加热器与氨水蒸发系统的氨水蒸发器连接,GSH蒸汽加热器出来的烟气通过氨水蒸发器进入SCR反应器内;所述SCR反应器的烟气出口与GGH烟气换热器连接,所述GGH烟气换热器利用SCR反应器出口的高温烟气对湿电除雾器出口的低温烟气进行加热。
2.根据权利要求1所述的一种无需外部能耗的危废焚烧SCR设备,其特征在于,所述氨水输送系统包括氨水储存罐,变频计量隔膜泵,流量计、调节阀、回流阀及管阀仪表,所述变频计量隔膜泵将氨水储存罐中氨水溶液抽出、计量、加压后送到双流体雾化喷枪。
3.根据权利要求1或2所述的一种无需外部能耗的危废焚烧SCR设备,其特征在于,所述蒸发系统包括氨水蒸发器、氨水溶液双流体雾化喷枪、压缩空气管路和减压阀,压缩空气经压缩空气管路并通过减压阀调压后送到双流体雾化喷枪,氨水溶液在压缩空气的引射作用下喷出,压缩空气和氨水溶液混合后经喷嘴雾化后喷入氨水蒸发器,氨水溶液在其中迅速蒸发气化成氨、水的烟气混合物,并与蒸发器内的烟气混合均匀进入烟气整流格栅。
4.根据权利要求1所述的一种无需外部能耗的危废焚烧SCR设备,其特征在于,所述SCR反应器包括SCR反应器本体以及设于本体内的反应器流场优化装置,整流装置和催化剂层。
5.根据权利要求4所述的一种无需外部能耗的危废焚烧SCR设备,其特征在于,所述SCR反应器本体内从上往下设有整流格栅和多层催化剂层,并且反应器中烟气竖直向下流动;所述整流格栅设于反应器入口处,用于保证氨喷射系统前烟气流动的均匀性,烟气进入第一层催化剂前的烟气温度分布、速度分布的均匀性以及烟气流出最后一层催化剂的NOx浓度分布和氨浓度分布的均匀性。
6.根据权利要求1所述的一种无需外部能耗的危废焚烧SCR设备,其特征在于,所述GSH蒸汽加热器包括热管式模块、蒸汽流量压力控制系统、冷凝水排放控制系统,余热锅炉过热蒸汽通过压力控制系统计量进入GSH蒸汽加热器内经热管式模块后回流冷凝水排出GSH蒸汽加热器,GGH蒸汽加热器出来的烟气通过氨水蒸发器进入SCR反应器内。
7.根据权利要求1所述的一种无需外部能耗的危废焚烧SCR设备,其特征在于,所述GGH烟气换热器包括壳体和热管式换热器,热管式换热器分二组设计,分别为GGH的低温组热管和高温组热管。
8.根据权利要求7所述的一种无需外部能耗的危废焚烧SCR设备,其特征在于,所述GGH的低温组热管采用不锈钢材质制作,以避免腐蚀,高温组热管采用碳钢材质制作。
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