华电技术 ›› 2017, Vol. 39 ›› Issue (5): 70-73.

• 节能与环保 • 上一篇    下一篇

360MW机组SCR脱硝系统运行优化模拟

  

  1. 华电电力科学研究院,杭州〓310030
  • 出版日期:2017-05-25

360MW unit SCR denitration system operation improvement simulation

  1. Huadian Electric Power Research Institute, Hangzhou 310030, China
  • Published:2017-05-25

摘要:

针对某360MW机组选择性催化还原法(SCR)脱硝反应器,利用现场实测运行数据对其进行了喷氨优化和流场优化的数值模拟。模拟结果显示,入口流场的不均匀性,在反应区NOx分布和速度场有明显的体现。通过划分控制区域,按照各区域内氨氮比均衡的原则,不断优化喷氨格栅各喷管喷氨量,可以将各控制区的氨氮比标准偏差从10.0%左右降低到1.5%以下。通过改变喷氨格栅后导流板结构,第1层催化剂入口速度场得到明显改善。对流场优化后重新进行了喷氨优化,结果显示:喷氨格栅后的流场优化对氨氮比均匀性影响不大。反应器入口处的烟气流场与喷氨模式共同决定了后续氨氮比的均匀性,喷氨格栅后的流场优化可以更多地改变分布的相对位置。

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Abstract:

Based on a 360MW unit SCR denitration reactor and site operation data, simulation of ammonia injection improvement and fluid field improvement was carried out. The result indicated that inlet fluid field is nonuniform. Which obviously reflect at NOx distribution andvelocity field. By dividing control zone and adjusting ammonia injection quantity, ammonianitrogen ratio was reduced from 10.0% to under 1.5%. By improving deflector structure, the first layer catalytic inlet velocity field was notably improved. Which indicated that the flow field after ammonia injectiongrating doesn’t affect ammonianitrogen ratio. Ammonianitrogen ratio is determined by reactor inlet flue gas flow field and ammonia injection method.

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