生物质气化气还原NO的化学反应动力学机制及数值模拟

Chemical Kinetic Mechanism and Numerical Simulation on NO Reduction by Biomass Gasification Gas

采用生物质燃料再燃方式既能减少NOx排放，又能减少CO2、SOx排放，因此生物质燃料再燃是具有优势的生物质能利用方式，成为再燃技术研究的新方向。生物质气化再燃相比较直接再燃，气化后再燃不会破坏锅炉的灰成分，同时锅炉受热面的积灰、结渣、腐蚀等问题也可以避免，尤其适合难以直接燃烧的生物质。生物质气化气还原NO的化学反应动力学机制研究有助于深入理解再燃过程，优化再燃效果。提出1套详细的化学反应动力学机制，并对稻杆气化气的再燃进行模拟与分析，针对温度、当量比这2个重要再燃参数，得出稻杆气化气再燃的最佳当量比为 f = 1.1~1.5，最佳温度范围在1 300 K以上。

Biomass reburning can reduce NOx, as well as CO2 and SOx emission, therefore it is a promising orientation for biomss utilization and has become a hot research subject. Biomass gasification for reburning, in contrast to direct reburning, does not change the character of the fly ash, as well as prohibit the accumulating, slagging and fouling problems. It is expecially suitable for the biomass not easy to burn. Kinetic mechanism study on NO reduction by biomass gasification gas can be helpful to understand the real reburning process, and simulation by the mechanism will optimise the reburning process. We proposed a new set of kinetic mechanism for reburning using biomass gasification gas, and simulated the reburning effect using gasification gas by rice straw. Results indicated that the optimal effect was under f = 1.1~1.5, temperature higher than 1 300 K.