Heating – Tumbler-type rotary - drum furnace
Patent
1994-12-13
1997-07-22
Bennett, Henry A.
Heating
Tumbler-type rotary - drum furnace
432106, 110246, 110216, F27B 700
Patent
active
056498233
ABSTRACT:
A bypass system is provided for a long cement kiln. The long cement kiln includes a cylindrical rotary vessel in which a kiln gas stream flows countercurrent to in-process mineral. The bypass system includes an annular bypass plenum, a port in the wall of the rotary vessel in gas flow communication with said plenum, and a draft tube for preventing passage of in-process mineral through said port. A blower fan induces flow of at least a portion of the kiln gas stream to form a bypass stream through the draft tube and the port and into the annular bypass plenum. The bypass system also includes an apparatus for mixing controlled amounts of ambient air with the bypass stream to cool the kiln gas bypass stream and to precipitate alkali fume in the kiln gas bypass stream before it passes through the draft tube and the port in the wall of the rotary vessel to reduce build up of condensed alkali inside the draft tube.
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Ash Grove Cement Company
Bennett Henry A.
Cadence Environmental Energy, Inc.
Lu Jiping
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