| 摘要 |
The present invention relates to an arrangement in a rotary kiln (20), and to a method for guiding air to such a rotary kiln. The rotary kiln comprises a circular-cylindrical structure including a combustion chamber (22) surrounded by a shell (23) provided with nozzles (34) for guiding combustion air to the combustion chamber. The combustion chamber is arranged to be substantially conically expanding from a first end (28) in the rotary kiln (20) to a second end (31 ) thereof. Then, each nozzle (34) is connected to an air pipe (26) arranged in the conically expanding shell and substantially co-directional with the central axis (25) of the rotary kiln and parallel with an outer surface (27) of the shell. This enables combustion air to be guided to air holes (33) opening up in the first end and connecting to the air pipes, the air being conveyed from the air holes via the nozzles (34) to the combustion chamber. |
