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NO_x Chemistry in Recovery Boilers under Staging Conditions

机译：在分期条件下恢复锅炉中的NO_X化学

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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：涉及氮化学动力学的详细描述的两种方法用于研究黑液回收锅炉中的分期。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段和添加空气分段到燃料分段。 CFD研究表明，如果锅炉下部的操作模式未被修饰，则分段仅对NO_X发射具有微小影响。在当前情况下，三级空气寄存器下部的温度太高。另一方面，燃料分级的动力学研究表明，单独的燃料分期可以减少NO_X排放量为50％。根据动力学研究，增加空气暂存到燃料上演锅炉仅略微提高了锅炉的整体性能，相对于NO_X排放。如果燃料分段和空气分期步骤同时而不是单独优化，则可以获得更高的NO_X降低。

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