COAL-PULVERIZATION SYSTEM Russian patent published in 1997 - IPC

FIELD: treatment of low-grade coals through thermal preparation before burning: boiler firing-up due to forming of hot flue gases during burning of fine dust. SUBSTANCE: system is provided with additional dust concentrator 7 whose discharge pipe 9 is connected to passive nozzle 20 of ejector 19 mounted at inlet of main dust concentrator 6; concentrated dust discharge branch pipes 13 and 14 of dust concentrator 6 are connected to inlet of additional dust concentrator 7. Additional burner 28 with igniter 29 is mounted on axial inlet branch pipe 27 of additional dust concentrator 7. Boiler firing-up is facilitated and combustion is stabilized due to thermal preparation of dust in dust concentrator 7 by heat generated during burning of fine dust with the aid of burner 28. Flue gases from burner 28 flow through ejector 19 for preliminary drying of dust in dust concentrator 6; as a result, no mazut is required for firing-up. EFFECT: facilitated firing-up and stabilized combustion. 1 dwg