增压富氧气氛下NOx均相生成及SNCR反应机理研究  

Study of homogeneous formation of NOx and SNCR reaction mechanism in pressurized oxy-fuel atmosphere

作　　者：段元强[1] 洪溥 仇兴雷 段伦博[1] 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)

机构地区：[1]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

出　　处：《中南大学学报（自然科学版）》2021年第1期96-105,共10页Journal of Central South University:Science and Technology

基　　金：国家重点研发计划项目(2018YFB0605301)。

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。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.

关 键 词：增压富氧燃烧 NOx 反应机理 均相生成 SNCR 

分 类 号：TK16[动力工程及工程热物理—热能工程]