PULVERIZED COAL/BIOMASS MIXED-COMBUSTION BURNER AND FUEL COMBUSTION METHOD

摘要

A biomass-mixed, pulverized coal-fired burner is provided. The biomass-mixed, pulverized coal-fired burner is capable of burning biomass fuel as auxiliary fuel in large quantities and burning only pulverized coal when the biomass fuel is not sufficiently available. The biomass-mixed, pulverized coal-fired burner 1 includes a biomass fuel jet nozzle 20 that extends axially along the biomass-mixed, pulverized coal-fired burner 1, a fuel jet nozzle 30 that is open midway in the biomass fuel jet nozzle, a secondary air nozzle 40 that surrounds the fuel jet nozzle, and a tertiary air nozzle 50 that surrounds the secondary air nozzle. A pulverized coal component in a fuel stream as a mixture of the pulverized coal fuel stream and the biomass fuel stream is distributed with a higher concentration on an outer circumferential wall side and a biomass fuel component in the fuel stream is distributed inside of the pulverized coal fuel component. A flame of the pulverized coal fuel offering favorable ignition and flame holding performance is thereby generated in a furnace and the biomass fuel stream is jetted into an inside of the flame.