Burner device, cooling pipe breakage detection method of burner device, and refrigerant control method of burner device

A burner device comprising:

• a furnace wall of a combustion furnace;
• a burner body which includes a furnace protruding portion protruding from the furnace wall into an interior of the combustion furnace;
• a cooling pipe through which a refrigerant for cooling the burner body flows, the cooling pipe being disposed so as to surround an outer peripheral surface of the furnace protruding portion;
• and
• a light detection unit for detecting internal light of the cooling pipe,
• the light detection unit including
• an optical fiber for transmitting light, the optical fiber being installed inside the cooling pipe,
• a light detector detecting inner light from the cooling pipe, the inner light being transmitted by the optical fiber, and
• a refrigerant supply pipe forming a flow channel for supplying the refrigerant to an inlet of the cooling pipe,
• wherein a distal end of the optical fiber is installed inside a portion disposed so as to surround an outer peripheral surface of the furnace protruding portion in the cooling pipe,
• wherein the cooling pipe is spirally wound a plurality of times in the furnace protruding portion,
• wherein the inlet of the cooling pipe is located closer to a tip side of the furnace protruding portion than an outlet of the cooling pipe, and
• wherein the optical fiber passes through the refrigerant supply pipe and is inserted into the cooling pipe through the inlet of the cooling pipe.