Method for a perforated flame holder with adjustable fuel nozzle

A method, comprising:

• outputting fuel from an adjustable-position fuel nozzle onto a perforated flame holder, the fuel being directed for mixture with an oxidant en route to the perforated flame holder;
• supporting a combustion reaction of the fuel and the oxidant within the perforated flame holder;
• and
• adjusting a position of the adjustable-position fuel nozzle relative to the perforated flame holder;
• wherein the adjusting a position of the adjustable-position fuel nozzle includes:
• extending the adjustable-position fuel nozzle toward the perforated flame holder to support a preheating flame near the perforated flame holder;
• and
• retracting the adjustable-position fuel nozzle from the perforated flame holder after the perforated flame holder has been preheated;
• and further comprising
• outputting a second flow of the fuel from one or more secondary fuel nozzles after retracting the adjustable-position fuel nozzle.

A method, comprising:

• outputting a first flow of fuel from an adjustable-position fuel nozzle;
• preheating a perforated flame holder to a threshold temperature by supporting a preheating flame of the first flow of fuel with the adjustable-position fuel nozzle positioned near the perforated flame holder;
• retracting the adjustable-position fuel nozzle from the perforated flame holder after the perforated flame holder has been preheated to the threshold temperature;
• outputting a second flow of fuel from the adjustable-position fuel nozzle onto the perforated flame holder after retracting the adjustable-position fuel nozzle from the perforated flame holder;
• and
• supporting a combustion reaction of the second flow of fuel within the perforated flame holder.