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首页> 外文会议>International Chemical Recovery Conference v.1; 20040606-20040610; Charleston,SC; US >NO_x Chemistry in Recovery Boilers under Staging Conditions
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NO_x Chemistry in Recovery Boilers under Staging Conditions

机译：分级条件下回收锅炉中的NO_x化学

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摘要

Two approaches involving detailed description of the nitrogen chemistry kinetics are used to study staging in black liquor recovery boilers. First, CFD is used to study the effect of staged tertiary (burnout) air on NO_x emission. Second, kinetic calculations are used to study fuel staging and of adding air staging to fuel staging. The CFD study showed that staging the tertiary air had only minor effects on NO_x emission if the operational mode of the lower part of the boiler is not modified. In the present case the temperature in the lower part of the tertiary air register was too high. The kinetic study of fuel staging, on the other hand, showed that fuel staging alone can reduce NO_x emission by the order of 50%. According to the kinetic study adding air staging to a fuel staged boiler only slightly improved the overall performance of the boiler with respect to NO_x emission. Higher NO_x reduction can probably be obtained if both the fuel staging and the air staging steps are optimized simultaneously rather than individually.
机译：涉及详细描述氮化学动力学的两种方法用于研究黑液回收锅炉的分级。首先，CFD用于研究分阶段的第三级（燃尽）空气对NO_x排放的影响。其次，动力学计算用于研究燃料分级并将空气分级添加到燃料分级中。 CFD研究表明，如果不修改锅炉下部的运行模式，则使第三级空气进入对NO_x排放的影响很小。在当前情况下，三次空气调节器下部的温度过高。另一方面，对燃料分级的动力学研究表明，仅燃料分级可将NO_x排放量降低50％左右。根据动力学研究，在分级燃料的锅炉中增加空气分级只会稍微改善锅炉在NO_x排放方面的整体性能。如果同时优化而不是单独优化燃料分级和空气分级步骤，则可以获得更高的NO_x还原率。

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