Interactions of HCN with NO in pressurized oxy‐combustion
发布时间：2025-04-30
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- 发布时间：
- 2025-04-30
- 论文名称：
- Interactions of HCN with NO in pressurized oxy‐combustion
- 发表刊物：
- Asia-Pacific Journal of Chemical Engineering
- 摘要：
- The process of recycling flue gas to the boiler of a pressurized oxy‐combustion system could affect the final concentration of NOx, 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 CO2 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, H2O 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 O2 decomposition and the positive effect on H2O decomposition at elevated pressures. An optimal temperature for NO reduction is shifted to lower temperature with increasing pressure and H2O concentration. The analysis of the total fixed nitrogen (TFN) indicates that for an actual boiler (5% O2), 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.
- 合写作者：
- Zhaomin Lv, Zia ur Rahman, Xuebin Wang, Xiaohe Xiong, Houzhang Tan
- 是否译文：
- 否
- 发表时间：
- 2022-11-21
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