THREE-STAGE COAL COMBUSTION METHOD BY USING PLASMA THERMOCHEMICAL TREATMENT

FIELD: power industry. ^ SUBSTANCE: effect is achieved with nitrogen oxide emission reduction method on the basis of three-stage pulverised coal combustion, which involves supply of larger part of fuel to the main burners - to the first zone - with excess air coefficient =1.02-1.08, supply of fuel - reducing agent with excess air coefficient =0.9-0.95 to the second zone located above the main burners, supply of the rest air to the third zone located above the second zone, which is theoretically required for this boiler; at that, to the reducing zone there added are products of plasma-coal thermochemical coal treatment with maximum content of reducing gases in their gaseous phase, and for that purpose the coal concentration in air-and-fuel mixture added to that chamber is specified within 0.25<