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中南大学学报(自然科学版)

Journal of Central South University

第52卷    第1期    总第317期    2021年1月

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文章编号:1672-7207(2021)01-0096-10
增压富氧气氛下NOx均相生成及SNCR反应机理研究
段元强,洪溥,仇兴雷,段伦博

(能源热转换及其过程测控教育部重点实验室,东南大学 能源与环境学院,江苏 南京,210096)

摘 要: 采用动力学计算与实验相结合的方式,对增压富氧气氛下的NOx均相生成和选择性非催化还原(selective non-catalytic reduction,SNCR)特性进行研究,分析温度、压力和组分体积分数等关键因素的影响。研究结果表明:对于NOx的均相生成反应,当反应压力为0.1~0.9 MPa时,最主要的NOx生成路径为NH3→NH2→H2NO→HNO→NO和HCN→CN→NCO→N2O;提高反应压力,上述NO和N2O主要生成路径基本保持不变;反应气氛中H2O分压提高使得部分H2NO中间体以及NO2产物进一步生成HONO,而HONO在H2O作用下快速分解为NO;而对于NOx的均相还原反应,提高反应压力可促进NO还原反应,但同时也在一定程度上可促进烟气中NO2的生成。

 

关键词: 增压富氧燃烧;NOx;反应机理;均相生成;SNCR

Study of homogeneous formation of NOx and SNCR reaction mechanism in pressurized oxy-fuel atmosphere
DUAN Yuanqiang, HONG Pu, QIU Xinglei, DUAN Lunbo

Key Laboratory of Energy Thermal Conversion and Control, Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China

Abstract:The kinetic calculations and experiments were conducted to study the homogeneous formation and selective non-catalytic reduction(SNCR) characteristics of NOx in the pressurized oxy-fuel atmosphere, and the effects of key factors such as temperature, reaction pressure, and component volume fraction were analyzed. The results show that the two most important pathways of NOx homogeneous formation are NH3→NH2→H2NO→HNO→NO and HCN→CN→NCO→N2O when the reaction pressure ranges from 0.1 MPa to 0.9 MPa. With the increase of reaction pressure, these above-mentioned main formation pathways of NO and N2O remain unchanged. Part of the H2NO intermediates and NO2 will further generate HONO with the increase of H2O partial pressure,and then HONO will decompose rapidly into NO during the catalysis of H2O. For the homogeneous reduction and decomposition of NOx , increasing the reaction pressure promotes the NO reduction reactions, and it also promotes the generation of NO2 in the flue gas to a certain extent.

 

Key words: pressurized oxy-fuel combustion; NOx; reaction mechanism; homogeneous formation; SNCR

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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