富氧燃烧系统中NO的还原及其排放

化工学报 ›› 2011, Vol. 62 ›› Issue (2): 495-501.

富氧燃烧系统中NO的还原及其排放

刘皓，任瑞琪，黄永俊，杨落恢，祝贺，Ando Takashi, Okazaki Ken

苏州大学能源学院;日本东京工业大学

出版日期:2011-02-05 发布日期:2011-02-05

Reduction and emission of NO in oxy-fuel system

LIU Hao, REN Ruiqi, HUANG Yongjun, YANG Luohui, ZHU He, Ando Takashi, Okazaki Ken

Online:2011-02-05 Published:2011-02-05

摘要/Abstract

摘要：

富氧燃烧方式具有排烟中的CO₂浓度高、CO₂捕捉回收处理容易等优点，是很有前途的新型清洁煤燃烧方式。通过实验得出了富氧燃烧过程中燃料氮生成NO的转化率随CO₂浓度的变化、循环NO在挥发分燃烧火焰中的还原率、循环NO对燃料氮生成NO的转化率的影响，并得出了相应的定量关系式。结合实验结果和系统物质平衡理论分析，得出了整个系统的燃料氮向排放NO的总体转化率。结果表明，由于干式循环的烟气循环倍率大于湿式循环，干式循环的NO排放减少幅度大于湿式循环的减少幅度。采用富氧燃烧, NO排放量可以降低到常规空气燃烧的1/7左右。循环NO的还原是

关键词: 煤；富氧燃烧；FONT-FAMILY: Calibri,sans-serif, mso-bidi-font-size: 11.0pt, mso-bidi-font-family: 宋体, mso-font-kerning: 1.0pt, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-fareast-font-family: 宋体, mso-hansi-font-family: 宋体">NO

Abstract:

Oxy-fuel combustion has an advantage of easy CO₂recovery due to its high CO₂ concentration in exhausted gas.It is a promising combustion method for coal.In this work, the change of conversion ratio of fuel-N to NO with CO₂concentration, reduction ratio of recycled NO in the reducing zone of volatile matter combustion, and the influence of recycled NO on conversion ratio of fuel-N to NO were investigated, and corresponding correlations were obtained.With these experimental results and theoretical analysis on the material balance in the system, the conversion ratio of fuel-N to NO in the system was derived.The results revealed that much less NO was released in a dry-recycle system than in a wet-recycle system, due to a higher gas recirculation ratio in the dry-recycle system.With oxy-fuel combustion, NO emission can be reduced to about only 1/7 of conventional air combustion.This effect is mainly attributed to the reduction of recycled NO.NO concentration increases with nitrogen content, but the increase in NO concentration is less than that in nitrogen content.As nitrogen content increases, the conversion ratio of fuel-N to NO of the system decreases.

Key words: 煤；富氧燃烧；FONT-FAMILY: Calibri,sans-serif, mso-bidi-font-size: 11.0pt, mso-bidi-font-family: 宋体, mso-font-kerning: 1.0pt, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-fareast-font-family: 宋体, mso-hansi-font-family: 宋体">NO

刘皓, 任瑞琪, 黄永俊, 杨落恢, 祝贺, Ando Takashi, Okazaki Ken. 富氧燃烧系统中NO的还原及其排放 [J]. 化工学报, 2011, 62(2): 495-501.

LIU Hao, REN Ruiqi, HUANG Yongjun, YANG Luohui, ZHU He, Ando Takashi, Okazaki Ken. Reduction and emission of NO in oxy-fuel system[J]. CIESC Journal, 2011, 62(2): 495-501.

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