煤炭解耦燃烧过程N迁移与转化Ⅱ:单组分气相化学反应实验

Nitrogen transformation during coal decoulping combustionⅡ: NO and N₂O reduction with single component of pyrolysis gas

摘要: 在理想平推流反应器中进行了模拟热解气对模拟烟气中NO、N₂O的还原实验研究,考察了反应温度、过剩空气系数λ、热解气中CH₄、CO、H₂、NH₃浓度、烟气中NO、N₂O浓度变化对NO、N₂O出口浓度的影响。实验结果表明,当模拟热解气仅含其中一种气体时,在反应温度973~1 223 K时热解气中CH₄、CO、H₂基本不与NO发生反应,当λ小于或等于1.0时可降低N₂O浓度0%~30%;热解气中NH₃可降低NO 10%~60%,但NH₃不与N₂O发生反应。

Abstract: Reduction of NO and N₂O with the simulated pyrolysis gas has been experimentally studied in an ideal plug flow reactor. The influences of reaction temperature, excess air number λ, concentrations of CH₄, CO, H₂, NH₃ in the simulated pyrolysis gas, concentrations of NO and N₂O in the flue gas on concentration of NO as well N₂O and total nitrogen conversion efficiency have been discussed. The results show that CH₄, CO and H₂ cannot effectively react with NO at 973~1 223 K. About 0~30% of the inlet N₂O can be reduced by CH₄, CO, or H₂ when λ is equal to or less than 1.0. Furthermore, about 10%~60% of the inlet NO can be reduced by NH₃, however, no N₂O concentration change is found when N₂O is mixed with NH₃ at 973~1 223 K.