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[1]张 健,毕德贵,张忠孝,等.煤粉炉高温还原性氛围下NH3还原NOx[J].燃烧科学与技术,2017,(05):406-411.[doi:10.11715/rskxjs.R201608005]
 Zhang Jian,Bi Degui,Zhang Zhongxiao,et al.NOx Reduction with NH3 Reagent Injected into High Temperature and Reducing Atmosphere in PC-boiler[J].Journal of Combustion Science and Technology,2017,(05):406-411.[doi:10.11715/rskxjs.R201608005]
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煤粉炉高温还原性氛围下NH3还原NOx()
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《燃烧科学与技术》[ISSN:1006-8740/CN:12-1240/TK]

卷:
期数:
2017年05
页码:
406-411
栏目:
出版日期:
2017-10-15

文章信息/Info

Title:
NOx Reduction with NH3 Reagent Injected into High Temperature and Reducing Atmosphere in PC-boiler
作者:
张 健毕德贵张忠孝岳朴杰
上海理工大学环境与建筑学院,上海 200093
Author(s):
Zhang JianBi DeguiZhang ZhongxiaoYue Pujie
School of Environment and Construction Engineering,University of Shanghai for Science and Technology, Shanghai 200093,China
关键词:
主燃区喷氨过量空气系数化学当量比NOx质量浓度
Keywords:
reagent injection in primary combustion zoneexcess air coefficientstoichiometric ratioNOx mass concentration
分类号:
TK224
DOI:
10.11715/rskxjs.R201608005
文献标志码:
A
摘要:
在一台75,t/h 煤粉炉上采用炉内空气分级和低氮燃烧器进行改造,在主燃区创造高温强还原性氛围,在 该区域喷入氨还原剂,通过实验研究在高温强还原性气氛下NH3 还原NOx 的影响因素及效果,结果表明:当主 燃区过量空气系数Φ1<1 时,喷入尿素溶液后,NOx 体积分数明显低于仅采用空气分级时的工况,当Φ1>1.15 时,则得到相反结果,在富氧条件下NH3易生成NOx;在Φ 1=0.9 时,四角处和侧墙处沿喷枪轴线方向氧体积分 数均小于0.4%,,温度在1,200~1,300,℃,该氛围下NH3可有效降低NOx;喷射位置在炉膛四角时NOx排放浓度 明显低于在侧墙处,最佳氨氮摩尔比为1.73,且在侧墙处喷入尿素溶液,随着氨氮摩尔比的增加NOx排放有明显 上升趋势;在主燃烧区喷入尿素溶液(Φ1=0.9,氨氮摩尔比为1.73)NOx 还原效率为66.5%,,比单独采用空气分 级高35.27%,,零氨逃逸.
Abstract:
This paper aimed at demonstrating an industrial retrofit to decrease NOx emission in a 75 t/h PC-boiler by adopting such approaches as ove fire air(OFA) and low NOx burners. A high temperature and reducing atmosphere was created in the main combustion zone with the air-staging configuration, in which NH3 was injected to further reduce NOx. The reduction of NOx by NH3 was investigated through a series of experiments. The main conclusions were shown as follows. When the stoichiometric ratio in the main combustion zone Φ1<1, NOx concentration was obviously reduced compared with that when only air staging was adopted. When Φ1>1.15, the opposite result was obtained, with more NOx emission generated. When Φ1=0.9, the oxygen concentration was less than 0.4% in the axis direction of injectors and the temperature range was within 1 200—1 300 ℃, NH3 could effectively reduce NOx emission. The NOx reduction was more obvious when NH3 reagent was injected from the four corners near the burner than that from the middle of the side walls. The optimum normalized stoichiometric ratio (NSR)was 1.73. The NOx showed a rising tendency with the increase of NSR when NH3 was injected from the side walls.When NH3 was injected into the main combustion zone, with Φ1=0.9 and NSR was 1.73, the NOx reduction efficiency was 66.5%, 35.27% higher than that when only air staging was adopted, with no escape of ammonia.

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备注/Memo

备注/Memo:
收稿日期:2016-08-15. 基金项目:上海浦江人才计划资助项目(16PJ1407800). 作者简介:张 健(1978— ),男,博士,讲师,jzhang66@163.com. 通讯作者:张忠孝,男,博士,教授,zhzhx222@163.com.
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