Fluid sand falling type circulating fluidized bed boiler with a plurality of risers and method of operating the same

A power generation plant using a fluid sand falling type circulating fluidized bed boiler for oxidizer thermal power generation with a plurality of risers, the fluid sand falling type circulating fluidized bed boiler comprising:

• a boiler section into which fuel is injected through a fuel injection section on one side of an upper portion of the boiler and combusted while flowing down therein, and into which oxidizer is injected through a plurality of oxidizer injection sections on a side wall of the boiler section in a height direction of the boiler section;
• a riser section connected to the boiler section so that the combusted fuel and fluid sand supplied from the boiler section are introduced from a bottom of the riser section and flow up;
• a relay section provided on the boiler section to supply the fluid sand having passed through the riser section to the boiler section;
• and
• a plurality of water tube sections provided on an outer wall and in an internal space of the boiler section and extending in the height direction of the boiler section.

A power generation system for oxidizer thermal power generation using a fluid sand falling type circulating fluidized bed boiler with a plurality of risers, the fluid sand falling type circulating fluidized bed boiler comprising:

• a boiler section into which fuel is injected through a fuel injection section on one side of an upper portion of the boiler and combusted while flowing down therein, and into which oxidizer is injected through a plurality of oxidizer injection sections on a side wall of the boiler section in a height direction of the boiler section;
• a riser section connected to the boiler section so that the combusted fuel and fluid sand supplied from the boiler section are introduced from a bottom of the riser section and flow up;
• a relay section provided on the boiler section to supply the fluid sand having passed through the riser section to the boiler section;
• and
• a plurality of water tube sections provided on an outer wall and in an internal space of the boiler section and extending in the height direction of the boiler section.