选择性非催化还原工艺
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大气污染防治技术-选择性非催化还原脱硝技术 – SNCR

选择性非催化还原脱硝技术 – SNCR技术

美国燃料技术公司的畅硝-SNCR工艺(NOxOUT®)是以尿素为还原剂的选择性非催化还原工艺(SNCR),用于减少燃料燃烧所排放的氮氧化物。此工艺是将稳定的尿素(或氨)制剂精确地喷射到燃烧器产生的高温烟气中进行反应。鉴于大多数 NOx 的还原反应发生在850°C-1150°C之间,美国燃料技术公司可根据用户的设备进行设计,选择合适的喷射点和喷射策略,为每位用户“量身定做”。如下图所示,我们通常设计多层喷射,并且根据锅炉负荷的变化和燃烧条件的改变自动调节尿素喷射,以提高反应效率。

NOxOUTDiagram chinese

美国燃料技术公司的畅硝- SNCR工艺系列的应用充分采用计算机模拟流体动力模型技术(CFD)和化学动力模型技术(CKM) ,利用CFD模拟软件模拟特定锅炉内烟气流场和温度场,根据CFD 提供的流场和温度场,利用CKM 模型来计算尿素与NOx 的反应速度。根据这两个模型的计算结果,以确定在不同锅炉负荷和不同煤种条件下炉膛内最佳喷射温度区域,从而确定最佳的喷射器布置方案。

燃料

  • 褐煤
  • 天然气
  • 城市垃圾
  • 煤泥
  • 木头
  • 生物
  • 生物/CO气

商业燃烧机组

  • 型燃烧锅炉
  • 旋风炉
  • 墙式燃烧锅炉
  • 炼油厂原油加热器和CO锅炉
  • 污泥燃烧室
  • 工业动力锅炉
  • 市政垃圾燃烧炉
  • 焚化炉
  • 循环流化床锅炉
  • 层燃炉
  • 快装锅炉

工艺燃烧机组

  • 水泥窑
  • 玻璃熔炉
  • 乙烯炉
  • 煅烧炉
  • 焦炭炉
  • 石灰窑

 

畅硝-SNCR工艺还可方便地与其它NOx减排技术配套使用,包括与低氮燃烧器、空气分级燃烬风、再燃技术、阶段性燃烧技术、SCR技术及烟气再循环等联合使用。美国燃料技术公司的专利工艺畅硝-SNCR+SCR混合脱硝技术,其成本只是传统SCR系统成本的一小部分却达到SCR类型优异的性能。

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