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Many NOx sensors work by first removing oxygen and then breaking down the nitrogen oxides to provide a reading. However, the NexTech sensor eliminates the need to remove oxygen; the sensor material is engineered to have a strong NOx sensitivity even in the presence of oxygen.
Under these circumstances, lowering the firing rate will effectively reduce NOx emissions. Low Excess Air. For boilers that use ring or spud burners, several modifications can be made that control flame length, delay combustion, delay fuel/air mixing, and reduce peak flame temperature to reduce NOx.