PULVERISED COAL BURNER AND BOILER

摘要

Disclosed are a pulverised coal burner and a boiler using the pulverised coal burner, wherein the pulverised coal burner comprises a central air cylinder (46, 56), a primary air cylinder (42, 52) and a twin flow field generating structure provided in the primary air cylinder (42, 52). The primary air cylinder (42, 52) is sheathed outside the central air cylinder (46, 56); the twin flow field generating structure can make the concentration of pulverised coal as an air flow containing powders that passes through the twin flow field generating structure and is injected by the primary air cylinder (42, 52) distributed as sparse on the outside and dense on the inside, and can form an annular recirculation area (12, 32, 63) between a sparsely concentrated air flow containing powders (65) and a highly concentrated air flow containing powders (64), and form a central recirculation area (24, 62, 71) in the highly concentrated air flow containing powders (64). The burner can more effectively inhibit production of NOx.