Method and apparatus for improved manufacture of cement in long

Details Method and apparatus for improved manufacture of cement in long Method and apparatus for improved manufacture of cement in long

1993-01-11

1994-12-27

Group, Karl

Compositions: coating or plastic

Coating or plastic compositions

Inorganic settable ingredient containing

106752, 106762, C04B 210

Patent

active

053755359

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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