烟气
化学
化学计量学
燃烧
锅炉(水暖)
氮气
大气温度范围
分解
分析化学(期刊)
二氧化碳
胺气处理
动能
热力学
物理化学
环境化学
有机化学
物理
量子力学
作者
Zhaomin Lv,Zia ur Rahman,Xuebin Wang,Xiaohe Xiong,Houzhang Tan
摘要
Abstract The process of recycling flue gas to the boiler of a pressurized oxy‐combustion system could affect the final concentration of NO x , which is very important for an appropriate design of the carbon capture process. During the recycling process, HCN, as the main intermediate of the reburn reaction, may interact with NO significantly to determine the final NO emissions. The current study aims to assess the gas‐phase interactions of HCN and NO in a CO 2 atmosphere, which is customary to pressurized oxy‐combustion conditions. A kinetic modeling study of the oxidation of HCN in the presence of NO has been performed under POC conditions and in the 973–1473 K temperature range. The influences of the stoichiometry, pressure, H 2 O concentration, and NO inlet concentration are analyzed. The results show that the HCN–NO interaction reduces both HCN and NO and that the interaction increases as pressure increases when the temperature is above 1073 K, whereas the opposite is found in low‐temperature regions. The effect of stoichiometric parameters also strongly depends on temperature but follows the opposite trend compared with the effect of pressure. These differences contribute to the suppressive effect on O 2 decomposition and the positive effect on H 2 O decomposition at elevated pressures. An optimal temperature for NO reduction is shifted to lower temperature with increasing pressure and H 2 O concentration. The analysis of the total fixed nitrogen (TFN) indicates that for an actual boiler (5% O 2 ), the temperature should be controlled at 1373, 1223, 1173, and 1173 K, respectively, as the pressure increases from 1 to 15 atm. Finally, a 21‐species and 69‐step reduced chemistry is developed and validated to accurately predict the interaction of HCN with NO at elevated pressures.
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