Flexible gas pipe ignitor

A pulverized coal-fired steam generator having a combustion chamber comprising a fuel-air admission assembly and an auxiliary fuel burner assembly disposed in a moveable structural element, the auxiliary fuel burner assembly comprising:

• a flexible gas ignitor pipe operatively connected a moveable air nozzle;
• the flexible gas pipe ignitor comprising:
• a housing having an axially interior space along its length, a supply end segment, a flame end segment axially spaced from the supply end segment, and a flexible segment spaced between the supply end segment and the flame end segment,
• a fuel supply conduit extending axially within the housing, the fuel supply conduit operatively flexible with the flexible segment;
• an ignition conduit extending axially within the housing, the ignition conduit operatively flexible with the flexible segment;
• a detector conduit extending axially within the housing, the detector conduit operatively flexible with the flexible segment;
• a flexible optical detector retractably disposed within the detector conduit;
• and
• an air supply conduit operatively connected to the housing at the supply end to provide combustion air within the axially interior space.

A gas pipe ignitor for igniting a non-premixed air and fuel mixture, comprising:

• a housing having an axially interior space along its length, a supply end segment, a flame end segment axially spaced from the supply end segment, and a flexible segment spaced between the supply end segment and the flame end segment;
• a fuel supply conduit extending axially within the housing, the fuel supply conduit operatively flexible with the flexible segment;
• an ignition conduit extending axially within the housing, the ignition conduit operatively flexible with the flexible segment;
• a detector conduit extending axially within the housing, the detector conduit operatively flexible with the flexible segment;
• a flexible optical detector retractably disposed within the detector conduit;
• an air supply conduit operatively connected to the housing at the supply end segment to provide combustion air within the interior space;
• and
• wherein the gas pipe ignitor has a release rate between 0.5 to 30 MMBTU per hour and is operatively connected to a moveable nozzle that pivots −30 to 45 degrees about an axis.