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Longer residence time in the primary zone always improves the combustor. True or false?

  • A.True, provided the pressure is high
  • B.False, only because the chamber becomes longer
  • C.False, it increases nitrogen oxide formation
  • D.True, more time means more complete burning

Answer: C

Thermal nitrogen oxide formation depends on time spent at high temperature as well as on the temperature itself. Longer residence helps completeness at idle and worsens nitrogen oxides at power, which is the same trade in another form.

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