Burner Locations And Spacing

NOx concentrations vary with burner type, spacing, and location in coal-fired generation plants. Cyclone burners are known for their highly turbulent operations and result in high-level emissions of NOx in these plants.

The amount of heat released in the burner zone seems to have a direct effect on NOx concentrations (see Figure 5.19.6). The OFC reduction techniques are the most effective for larger generating units with larger burners. These techniques are effective since essentially all NO is formed in the primary combustion zone, and as the burner size increases, the primary zone becomes less efficient.

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