PULVERIZED COAL BURNING BOILER

• Main Authors: SHIMOHIRA, KATSUMI, OHYATSU, NORIYUKI, YOSHIZAKO, HIDEHISA, OKIMURA, HITOSHI, MIYAKE, SEISHI
• Format: Patent
• Language: English; French; German
• Published: 13.01.2010
• Subjects: AIR; AIR SUPPLY; BLASTING; COMBUSTION APPARATUS; COMBUSTION PROCESSES; DRAUGHT-INDUCING; FEEDING FUEL TO COMBUSTION APPARATUS; HEATING; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT; LIGHTING; MEASURING; MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION,OR SHOCK; MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUIDLEVEL; MECHANICAL ENGINEERING; METERING BY VOLUME; METHODS OF STEAM GENERATION; METHODSOR APPARATUS FOR COMBUSTION USING FLUID FUELOR SOLID FUEL SUSPENDED IN; PHYSICS; REGULATING OR CONTROLLING COMBUSTION; STEAM BOILERS; STEAM GENERATION; SUPERHEATING OF STEAM; SUPPLYING NON-COMBUSTIBLE LIQUID OR GAS; TESTING; WEAPONS

Provided is a finely-powdered coal burning boiler, which reduces an air-excess ratio thereby to reduce the emission of unburned contents such as CO. The finely-powdered coal burning boiler comprises finely-powdered coal feed measuring means (51) for measuring the feeding rates of the finely-powdered coal to be conveyed through coal feeding pipes (43), individually, and control means (66) for calculating the burning air feeding rates to match the finely-powdered coal feeding rates thereby to send a control command signal to burning air feed adjusting means (64), so that a burner air ratio set by burner air ratio setting means may be kept on the basis of both the finely-powered coal feeding rate, which is measured by the finely-powdered coal feed measuring means (51), and the burning air feeding rate, which is measured by the burning air feeding rate measuring means and fed to a finely-powdered coal burner (61) connected to the coal feeding pipes (43).