第28卷第3期
动
力
工
程
V01.28
No.3
2008年6月
Journal
of Power Engineering
June
2008
文章编号:1000-6761(2008)03—0442-05
循环流化床锅炉选择性非催化还
原技术及其脱硝系统的研究
罗朝晖,
王恩禄
(上海交通大学,上海200240)
摘要:大型循环流化床(CFB)锅炉分离器区域采用选择性非催化还原(SNCR)脱硝技术可以实
现燃煤锅炉的超低N0。排放.对分别选用氨水、纯氨及尿素作反应剂的SNCR脱硝系统的优缺点
进行了比较.结合工程实践,给出了大型CFB锅炉上SNCR脱硝系统的选取原则.并指出:大型
CFB锅炉SNCR脱硝系统一般采用氨作为反应剂.
关键词:环境工程学;循环流化床锅炉;选择性非催化还原;脱硝系统;氨水;纯氨;尿素
中图分类号:X511
文献标识码:A
Selective Non-Catalytic Reduction Technology and
Its
DenitrificatjOn Systems Used in CFB Boi lers
LUO
Zhao-hui。W|ANG
En—lu
(Shanghai
Jiaotong
University,Shanghai 200240,China)
Abstract:Ultra-low
NO。emission of coal—fired
boilers
can
be
achieved
by adopting the
selective
non-
catalytic reduction(SNCR)technology
for
separators
of
large-scale
circulating
fluidized
bed(CFB)
boilers.Advantages and disadvantages of the SNCR denitrification systems were separately compared by
using different reactants,such
as
aqueous
ammonia,anhydrous ammonia and
urea
etc.Considering actual
requirements of engineering
projects,specific
choosing ways of SNCR denitrification systems for large-
scale CFB boilers
are
recommended,which point
out
that ammonia is generally adopted
as
the
reactant
in
SNCR denitrification system of large-scale CFB boilers.
Key
words:environmental
science;CFB
boiler;SNCR;denitrification
system;aqueous
ammonia;
anhydrous ammonia;urea
我国大气污染物排放量的70%来自煤炭燃烧,
燃煤排放的NO。占我国NO。排放总量的60%[1].
电站锅炉控制N0。排放的技术主要包括2种:低
NO,燃烧的一次技术和烟气脱硝的二次技术,即选
择性催化还原反应(Selected
Catalystic Reduction,
简称SCR)技术和选择性非催化还原反应(Selected
Non-Catalystic
Reduction,简称SNCR)技术.
煤粉锅炉采用低NO。燃烧器技术,可获得一定
的NO。排放控制效果[2].但为了满足排放法规要
求,一般还必须配备SCR烟气脱硝装置,以将煤粉
锅炉的NO,排放降低到100 mg/m3左右[3],同时
保证NH。逃逸量小于5×10_6水平[4].SCR脱硝系
坟稿日期:2007—09-05
修订日期:2007—10—15
作者简介:罗朝晖(1972一),男,安徽青阳人,工程硕士。工程师,从事锅炉机务工作.电话(Tel.):13611726383;E-mail sluozhaohuimail@
yahoo.com.
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