Method for improved manufacture of cement in long kilns

Details Method for improved manufacture of cement in long kilns Method for improved manufacture of cement in long kilns

F - Mech Eng,Light,Heat,Weapons

27

B

F27B 7/36 (2006.01) C04B 7/43 (2006.01) C04B 7/44 (2006.01) F27B 7/20 (2006.01) F27D 17/00 (2006.01)

Patent

CA 2139874

The present invention is directed to a method and apparatus for controlling the kiln gas stream (90, 138) in a conventional long wet or dry process cement kiln (10). A portion of the kiln gas stream (90) can be withdrawn from the rotary kiln vessel (17) at a point upstream, relative to kiln gas flow of the chain system in the mineral drying zone (24). Alternatively, or in conjuction with bypass formation, the apparatus (256) can be used to add tertiary air to the kiln gas stream (90) to promote combustion efficiency downstream of the clinkering zone (28). Use of the present apparatus (56, 156) to form a kiln gas bypass stream (64) enhances op- erating efficiencies of long kilns by reducing dust loss, by facilitating isolation of high alkali by-product streams, by reducing al- kali content of collected kiln dust, by increasing energy efficiency of long kiln operation, and by allowing greater overall control in the cement manufacturing process.

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