Burner with torch ignition mechanism and operation method thereof

A burner with a torch ignition mechanism, comprising:

• a tubular torch part extending in an axial direction;
• a main fuel-main oxidant supply part provided on one end side of the torch part and formed in an annular shape on an outer periphery of the torch part;
• and
• a flame detection mechanism provided on the other end side of the torch part, wherein
• the torch part includes:
• a torch part casing;
• a torch combustor liner that is provided in the torch part casing and burns a fuel and an oxidant;
• a torch fuel supply part that supplies a fuel into the torch combustor liner;
• a torch oxidant supply part that supplies an oxidant into the torch combustor liner;
• an ignition device that ignites a fuel-air mixture inside the torch combustor liner;
• a combustion gas pipe that extends from the torch combustor liner toward one end side of the torch part, is arranged at the center of the torch part, and leads a combustion gas generated in the torch combustor liner to one end side of the torch part;
• and
• a cooling medium passage that is formed in an annular shape between the torch combustor liner and the combustion gas pipe and the torch part casing, and leads a cooling medium toward one end side of the torch part,
• the main fuel-main oxidant supply part includes:
• a main fuel supply passage formed in an annular shape on the outer periphery of the torch part;
• and
• a main oxidant supply passage formed in an annular shape on an outer periphery of the main fuel supply passage, and
• the flame detection mechanism includes:
• a flame detection part provided on the other end side of the torch part,
• (A) the flame detection part detecting a flame in the torch combustor liner when a flame is formed in the torch combustor liner and (B) the flame detection part detecting a flame formed by a fuel and an oxidant supplied from the main fuel-main oxidant supply part when no flame is formed in the torch combustor liner;
• and
• a flame detection passage that communicates the flame detection part with the torch combustor liner,
• wherein the combustion gas pipe, the torch combustor liner, the flame detection passage, and the flame detection part are arranged coaxially with a center axis of the burner.