Experimental Study on Combined Reduction of NO by Wood Chip Pyrolysis Gas and Ammonia

开发绿色、高效、低成本的脱硝技术对我国控制燃烧产生的氮氧化物有重要意义。本文搭建高温燃烧反应机理试验台，通过实验研究木片热解气与氨(NH3)复合还原NO的特性规律。结果表明，采用单一热解气作为还原剂时，温度和过量空气是影响NO还原的关键因素，越高的反应温度，越低的过量空气系数越有利于NO还原。采用木片热解气与NH3复合还原NO时，过量空气系数为0.2~0.6时添加NH3对NO还原的促进作用更加显著，木片热解气与氨复合还原的最优工况：1200℃、过量空气系数为0~0.2以及氨氮摩尔比为0.67时，可实现90.39%~94.45%的NO还原效率，本研究为开发新型脱硝技术提供参考。The development of green, efficient, and low-cost denitrification technologies is of great significance for controlling combustion-generated nitrogen oxides (NOX) in China. In this study, a high-temperature combustion reaction experimental platform was established to experimentally investigate the synergistic reduction behavior of nitric oxide (NO) using pyrolysis gas derived from wood chips in combination with ammonia (NH₃). The results demonstrate that, when pyrolysis gas is used as the sole reducing agent, both reaction temperature and excess air coefficient are key factors influencing NO reduction; elevated temperatures and lower excess air coefficients are more favorable toward NO reduction. When combining wood chip pyrolysis gas with NH₃, the promoting effect of NH₃ on NO reduction becomes more pronounced at excess air coefficients in the range of 0.2~0.6. The optimal operating conditions for the combined reduction process are identified as: reaction temperature of 1200˚C, excess air coefficient of 0~0.2, and an ammonia-to-nitrogen molar ratio of 0.67, under which an NO reduction efficiency of 90.39%~94.45% can be achieved. This study provides a reference for the development of novel denitrification technologies.