华电技术 ›› 2019, Vol. 41 ›› Issue (10): 8-11.

• 专题综述 • 上一篇    下一篇

火电机组SCR脱硝系统精准喷氨优化研究

  

  1. 中国华电科工集团有限公司,北京〓100070

  • 出版日期:2019-10-25

Research on precise ammonia injection retrofit for SCR denitration systems in thermal powers

  1. China Huadian Engineering Corporation Limited, Beijing 100070, China

  • Published:2019-10-25

摘要:

全国火电厂机组脱硝系统超低排放标准普及之后,传统的SCR脱硝工艺无法精确控制喷氨量,从而导致NOx局部排放超标、氨逃逸率偏高和空气预热器堵塞等问题。以江苏某电厂 #7机组为例,对该机组进行了分区喷氨改造,增加了多点NOx质量浓度测量系统及智能化喷氨控制逻辑,建立了大数据预测NOx分析站,尝试更加精确地预测烟气中NOx的质量浓度。改造后,该机组氨耗量降低了8%~10%,出口NOx分布均匀,氨逃逸率降低,解决了空气预热器堵塞问题,实现了SCR脱硝系统超低稳定排放。

关键词:

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Abstract:

After the popularization of ultralow emission standards for denitration systems in domestic thermal power plants, inaccurate ammonia injection of traditional SCR denitration  systems has resulted in excessive NOx emissions, high ammonia escape rate,blockage of air preheaters and so on. Taking No.7 unit of a power plant in Jiangsu as an example,  ammonia injection retrofit for the unit was executed sector by sector, and multipoint measurement system for NOx mass concentration and intelligent ammonia injection control logic were added. A big data prediction and analysis station for NOx was established, which can predict the NOx mass concentration more accurately. After the retrofit, the ammonia consumption of the unit is reduced by 8%~10%, NOx distribution at the outlet is uniform, the ammonia escape rate is reduced, the air preheater blockage problem is solved.The ultralow emission of the SCR denitration system is realized.

Key words:

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