| 摘要 |
A burner (10) is provided for supplying coal-liquid slurry and combustion air to a furnace (2). The burner housing (12) is mounted about the burner throat opening (6) and interconnected to a combustion air supply duct (8). A coal slurry gun (14) is disposed coaxially within the housing for spraying the coal-liquid slurry into the furnace. A first conduit means (20) is disposed coaxially about the coal slurry gun to define a primary air flow passage (22) surrounding the slurry gun. Additionally, a second conduit means (30) is disposed coaxially about the first conduit means (20) to define a secondary air flow passage (32) between the first and second conduit means and a tertiary air flow passage (34) between the second conduit means and the burner throat (4). Independently controllable dampers 41, 42 and 43 are provided in the air inlets to the primary, secondary and tertiary air flow passages to permit independent control of air flow velocity. A diffuser means (50) is slidably mounted about the coal slurry gun so as to be translatable from a position adjacent the furnace at low loads to a position remote therefrom at high loads. Further, an annular sleeve (60) is mounted about the first conduit means (20) and translatable therealong for selective postioning relative to the diffuser means (50) for controlling the flow area (33) of the outlet of the secondary air flow passage (32).
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