化工进展 ›› 2021, Vol. 40 ›› Issue (8): 4610-4615.doi: 10.16085/j.issn.1000-6613.2020-1844

• 资源与环境化工 • 上一篇    下一篇

中试平台SCR低温催化剂测试与氨逃逸分布特征

赵瑞(), 张翼, 余学海, 史晓宏, 刘毅, 王鹏, 韩涛   

  1. 神华国华(北京)电力研究院有限公司,北京 100084
  • 收稿日期:2020-09-14 出版日期:2021-08-05 发布日期:2020-12-31
  • 通讯作者: 赵瑞 E-mail:16810096@chnenergy.com.cn
  • 作者简介:赵瑞(1984—),女,博士,高级工程师,研究方向为脱硝催化剂检测及应用。E-mail:16810096@chnenergy.com.cn
  • 基金资助:
    国家科技支撑计划(2015BAA05B02)

SCR low-temperature catalyst test and NH3-slip distribution profile on the pilot platform

ZHAO Rui(), ZHANG Yi, YU Xuehai, SHI Xiaohong, LIU Yi, WANG Peng, HAN Tao   

  1. Shenhua Guohua (Beijing) Electric Power Research Institute Co. , Ltd. , Beijing 100084, China
  • Received:2020-09-14 Online:2021-08-05 Published:2020-12-31
  • Contact: ZHAO Rui E-mail:16810096@chnenergy.com.cn

摘要:

目前燃煤机组低负荷运行的情况越来越多,研究机组低负荷运行时NOx控制技术可有效降低燃煤机组的NOx排放浓度。本文利用已建成的20000m3/h的实际燃煤烟气的污染物脱除试验平台,安装低温段脱硝催化剂整体模块,测试该催化剂的性能指标,现场取样并重点分析氨逃逸和转化率指标,得出实际烟气条件下氨逃逸分布特征。结果表明:该低温脱硝催化剂的低温段在290~250℃范围内,脱硝效率可达到80%,脱硝出口NOx可控制在50mg/m3(标准)以内,甚至20mg/m3以内,氨逃逸最高为1.68mg/m3,小于标准要求值2.28mg/m3,SO2/SO3转化率最高为0.73%,小于标准要求值1%,满足运行要求。文中进一步研究了氨逃逸浓度沿程分布情况,经测试表明,290℃时沿程氨逃逸浓度不断降低,除尘器前降低32.2%,除尘器后降低65.5%。

关键词: 选择性催化还原低温催化剂, 氨逃逸分布特征, SO2/SO3转化率, 实际燃煤烟气, 中试平台

Abstract:

At present, there are more and more low-load operations of coal-fired units. The study on the deNOx control technology of low-load operation can effectively reduce the NOx emission of coal-fired units. The established real-time flue gas pollutant removal pilot test platform with 20000m3/h was used to analyze the performance indexes, in which the whole modules of the low-temperature denitration catalysts were installed into the SCR system. The NH3 slip concentration and SO2/SO3 conversion rate were sampled on-site and analyzed, the NH3 slip distribution characteristics were observed. The results show that when the low-temperature catalyst range is 290—250℃, the denitration efficiency is about 80%, and the NOx at the SCR outlet can be controlled within 50mg/m3, even within 20mg/m3, meanwhile, the maximum NH3 slip is 1.68mg/m3, which is less than 2.28mg/m3, required by the criterion. The maximum SO2/SO3 conversion rate is 0.73%, which is less than 1%, required by the criterion. All these indexes meet the operation requirements. The distribution of NH3 slip along the pollution control process is further studied. The results show that the NH3 slip concentration is continuously decreased along the way. The NH3 slip concentration at ESP inlet is decreased by 32.2% and 65.5% at the ESP outlet, respectively.

Key words: low temperature SCR catalyst, NH3-slip distribution characteristics, SO2/SO3 conversion rate, real coal-fired flue gas, pilot platform

中图分类号: 

  • O643.36