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Alternative TitleModeling NOx formation in pulverized coal oxy-fuel combustion by detailed chemical reaction mechanism
李森; 魏小林; 郭啸峰

本文采用详细化学反应机理,建立氧煤燃烧气固反应模型,分析煤在富氧燃烧条件下NOx生成机制,研究不同O2浓度和分级燃烧对NOx排放的影响。富氧燃烧时, NOx生成主要路径为:HCN→CN→NCO→NO和HCN→CN→NCO→HNCO →HN2→NH→HNO→NO。初始O2增大,挥发分和HCN析出时间提前,高的O2初始浓度对燃料N转化率有促进作用;煤富氧分级燃烧时,主燃区还原气氛有利于NO还原为N2,其主要还原路径如下: NO+CO→N+CO2、NO+H→N+OH和NO+N→N2+O,当主燃区过量空气系数SR1从1.15减小到0.6,N最终转化率(t=1000 ms)只是从0.379减小到0.339,相对于未分级燃烧时变化了10.55%,与煤空气分级燃烧相比,煤富氧分级燃烧对N转化率影响较小。

Other AbstractGas-solid reaction model of pulverized coal was established based on detailed chemical reaction mechanism, the NOx formation mechanism in oxy-coal combustion was analyzed, and the effects of O2 concentration and air staged combustion on NOx emission were investigated. NOx formation paths in oxy-coal combustion are HCN&rarrCN&rarrNCO&rarrNO and HCN&rarrCN&rarrNCO&rarrHNCO&rarrHN2&rarrNH&rarr HNO&rarrNO. The increase of initial O2 concentration makes the release of volatile and HCN ahead, and increasing initial concentration of O2 promotes the conversion rate of fuel N. In Oxy-coal staged combustion, the reducing atmosphere in primary combustion zone is conducive to NO reduction to N2, and the main reaction paths are NO+CO&rarrN+CO2, NO+H&rarrN+OH and NO+N&rarrN2+O. N conversion rate decreases from 0.379 to 0.339 when the excessive air rate decreases from 1.15 to 0.6, and it decreases 10.55% as compared that of unstaged combustion. Oxy-coal combustion has slightly influence on N conversion rate as compared that of air-coal combustion.
KeywordNo_x 富氧燃烧 详细机理
Subject Area化工流体力学
Indexed ByEI ; CSCD
Funding Organization国家自然科学基金面上项目(No.50976123)
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Document Type期刊论文
Corresponding Author李森
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李森,魏小林,郭啸峰. 采用详细化学反应机理研究煤富氧燃烧NO_x生成机制[J]. 工程热物理学报/JOURNAL OF ENGINEERING THERMOPHYSICS,2012,33(11):2002-2005.
APA 李森,魏小林,&郭啸峰.(2012).采用详细化学反应机理研究煤富氧燃烧NO_x生成机制.工程热物理学报/JOURNAL OF ENGINEERING THERMOPHYSICS,33(11),2002-2005.
MLA 李森,et al."采用详细化学反应机理研究煤富氧燃烧NO_x生成机制".工程热物理学报/JOURNAL OF ENGINEERING THERMOPHYSICS 33.11(2012):2002-2005.
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