SNCR脱硝特性的模拟及优化

doi:10.3969/j.issn.0438-1157.2013.05.039

化工学报 ›› 2013, Vol. 64 ›› Issue (5): 1789-1796.DOI: 10.3969/j.issn.0438-1157.2013.05.039

SNCR脱硝特性的模拟及优化

李穹, 吴玉新, 杨海瑞, 吕俊复

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

收稿日期:2012-08-04 修回日期:2012-11-24 出版日期:2013-05-05 发布日期:2013-05-05
通讯作者: 李穹
作者简介:李穹(1988-),男,硕士研究生。
基金资助:
国家科技支撑计划项目(2012BAA02B01);国家自然科学基金项目(51076081)。

Simulation and optimization of SNCR process

LI Qiong, WU Yuxin, YANG Hairui, LÜ Junfu

Key laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China

Received:2012-08-04 Revised:2012-11-24 Online:2013-05-05 Published:2013-05-05
Supported by:
supported by the Key Project in the National Science & Technology Pillar Program(2012BAA02B01)and the National Natural Science Foundation of China(51076081).

摘要/Abstract

摘要： 对某台使用尿素为还原剂的100 t·h^-1循环流化床锅炉的SNCR性能进行了CFD数值模拟,分析了温度、氨氮摩尔比等影响因素对SNCR脱硝效率、氨泄漏以及N₂O浓度的影响规律。结果表明,SNCR最佳温度窗口的范围为850~1050℃,且随着氨氮比的增大,温度窗口范围变宽;随着温度的升高,氨逃逸量明显下降,当温度超过940℃后,氨逃逸量基本可以忽略不计,而N₂O的生成量则呈现出先增大后减少的趋势。随着氨氮摩尔比的增加,脱硝效率逐渐增大,980℃左右达到峰值;氨泄漏随氨氮摩尔比的增加而增大;N₂O浓度与脱硝效率呈正比关系,最大生成量约为30 μl·L^-1。

关键词: 选择性非催化还原, 温度窗口, 氨氮比, 氨逃逸, CFD

Abstract: Using computational fluid dynamics(CFD)method,the urea-based selective non-catalytic reduction(SNCR)process in a 100 t·h^-1 circulating fluidized bed(CFB)boiler was numerically simulated to study effect of temperature and normalized stoichiometric ratio(NSR)on SNCR denitration efficiency, NH₃ slip and N₂O formation.The results show that the window of optimized temperature for SNCR process is in a range of 850-1050℃ and becomes wider with increasing NSR; when temperature rises, NH₃ slip decreases obviously and can be ignored if temperature is higher than 940℃.With increase of temperature, amount of N₂O formation increases first and then decreases.With increasing NSR, the denitration efficiency and NH₃ slip increase.The denitration efficiency is the maximum at 980℃.Formation of N₂O is in proportion to denitration efficiency and the maximum about 30 μl·L^-1.

Key words: SNCR, temperature window, NSR, NH₃ slip, CFD

中图分类号:

李穹, 吴玉新, 杨海瑞, 吕俊复. SNCR脱硝特性的模拟及优化[J]. 化工学报, 2013, 64(5): 1789-1796.

LI Qiong, WU Yuxin, YANG Hairui, LÜ Junfu. Simulation and optimization of SNCR process[J]. CIESC Journal, 2013, 64(5): 1789-1796.

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SNCR脱硝特性的模拟及优化

Simulation and optimization of SNCR process

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