RAISING THE RELIABILITY, EFFICIENCY, AND ECOLOGICAL SAFETY OF OPERATION OF THE BKZ-210-140F BOILER TRANSFERRED TO STAGE FIRING OF KUZNETSK COAL IN A U-SHAPE FLAME

摘要

The BKZ-210-140F boiler of the West-Siberian Cogeneration Plant was equipped initially with four uniflow tangentially oriented burners and tertiary air nozzles. In order to raise the efficiency of operation and lower harmful emissions the boiler was reconstructed. U-shape aerodynamics was organized in the furnace by mounting 8 burners, 8 secondary air nozzles, and 8 tertiary air nozzles on the front and rear walls of the furnace. The reconstruction ensured higher stability of ignition of pulverized coal without flame division and rated temperatures of the superheater metal, lowered the optimum excess air factor at the outlet from the superheater to 1.2 - 1.25, decreased the concentration of nitrogen oxides in the combustion products to 360 - 380 mg/m~3, and increased the gross efficiency of the boiler to 91.5 - 91.7%.