中国电力 ›› 2013, Vol. 46 ›› Issue (9): 1-5.DOI: 10.11930/j.issn.1004-9649.2013.9.1.4

• 循环流化床技术专栏 •    下一篇

循环流化床锅炉烟气脱硝系统优化模拟

李竞岌1, 杨海瑞1, 李穹1, 杨建华2, 吕俊复1   

  1. 1. 清华大学 热能工程系 热科学与动力工程教育部重点实验室,北京 100084; 2. 河南郑州电力高等专科学校,河南 郑州 450004
  • 收稿日期:2013-03-06 出版日期:2013-09-23 发布日期:2015-12-10
  • 作者简介:李竞岌(1990—),男,黑龙江哈尔滨人,博士研究生,从事循环流化床锅炉超低NOx排放相关研究。
  • 基金资助:
    国家科技支撑计划资助项目(2012BAA02B01)

Numerical Simulation and Optimization of SNCR System for CFB Boilers

LI Jing-ji1, YANG Hai-rui1, LI Qiong1, YANG Jian-hua2, LU Jun-fu1   

  1. 1. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China; 2. Henan Zhengzhou Electric Power College, Zhengzhou 450004, China
  • Received:2013-03-06 Online:2013-09-23 Published:2015-12-10

摘要: 随着电站锅炉氮氧化物(NOx)排放标准的日趋严格,具有低NOx排放特征的循环流化床(CFB)锅炉也需增设烟气脱硝设备。通过在CFB锅炉旋风分离器喷入氨水或尿素等还原剂,实现高温下的选择性非催化还原(SNCR)反应,可有效降低锅炉NOx排放。以某185 t/h CFB锅炉为例,利用ANSYS Fluent��软件,对分离器及附属尾部烟道流场进行性能优化模拟,并设计了相应的SNCR烟气脱硝系统。计算结果表明:当喷入点个数较多且位于进口段内侧时,还原剂在分离器内分布较为均匀;提高平均雾化粒径和喷雾锥角有助于扩大还原剂在分离器内的分散范围,而喷射速度对分散范围的影响则有限。

关键词: 选择性非催化还原, 喷射参数, 流场模拟, 循环流化床

Abstract: With the regulation on NOx emission for power plants becoming more and more stringent, the DeNOx devices have to be installed even for the low NOx emission CFB boilers. NOx emission of boilers can be effectively decreased by injecting the reductant, such as ammonia or urea, into the inlet of CFB cyclones to realize the SNCR at high temperature. In this paper, the flow field of the cyclone and attached flue of a 185-t/h CFB boiler is simulated by ANSYS Fluent�� software and a SNCR DeNOx system is designed accordingly. The simulation results show that it is preferable to install more nozzles at the inner side of the cyclone inlet to improve the uniformity of the distribution of reductant. Also, increasing the average atomized particle size and spray cone angle is helpful to enlarge the spray range of reductant, but the effect of the spray speed on the spray range is limited

Key words: SNCR, spray parameter, flow field simulation, CFB

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