Rotary kiln plant
AssigneeF. L. Smidth & Co.
InventorRolf Dietrich Houd
Life of this patent
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Abstract
A rotary kiln plant for calcining and sintering mineral materials such as cement raw materials, comprising a separate unit for preheating and at least partially calcining the raw materials, a rotary kiln for sintering the preheated and calcined raw materials, a separate inside airswept rotary cooler means for cooling the materials burnt in the kiln, and a stationary chamber positioned intermediate the outlet of the rotary kiln and the inlet of the rotary cooler means and forming a passage for the burnt kiln product from the kiln to the rotary cooler means in countercurrent with heated cooling air passing to the rotary kiln. Air inlet and outlet means on the chamber make it possible to introduce additional cooling air and to utilize cooling air from the chamber for the preheating and calcining unit while by-passing the rotary kiln.
Claims33
A rotary kiln plant for calcining and sintering mineral materials such as cement raw materials which comprises separate means for preheating and calcining the raw materials, a rotary kiln for burning the raw materials and a rotary cooler means for cooling the materials burnt in the rotary kiln, a stationary chamber positioned intermediate the outlet portion of the rotary kiln and the inlet portion of the rotary cooler means in a manner to form a passage for the burnt kiln product from said kiln to said rotary cooler means in countercurrent with heated cooling air passing to said rotary kiln for use as combustion air, inlet means on said intermediate chamber for the admission of additional cooling air into said chamber, and outlet means on said intermediate chamber for discharging at least part of the preheated cooling air therefrom, said chamber outlet means communicating with said preheating and calcining means independently of said rotary kiln so as to by-pass said rotary kiln.
A rotary kiln plant for calcining and sintering cement raw materials which comprises separate means for preheating said raw materials in the form of at least two suspension cyclone preheaters, a calcining apparatus for calcining the cement raw materials preheated in said cyclone preheaters, a rotary kiln for sintering the cement raw materials, a rotary cooler means for cooling the materials sintered in the rotary kiln, said rotary cooler means having a plurality of cooler tubes arranged in a planetary fashion around an outlet end of a main rotary cooler tube, a stationary chamber positioned intermediate the outlet end of the rotary kiln and the inlet end of the rotary cooler and communicating therewith so as to form a passage for the sintered cement clinker from said kiln to said rotary cooler in countercurrent with heated cooling air passing to said rotary kiln for use as combustion air, a stationary inlet means on said intermediate chamber adapted for admitting additional cooling air into said chamber, an outlet means on said chamber adapted for discharging at least part of the preheated cooling air therefrom, a conduit connected to the preheated cooling air outlet of said intermediate chamber and communicating with the combustion air inlet of said calcining apparatus, a conduit connecting the air outlet end of said calcining apparatus with at least one suspension cyclone preheater, a fan positioned and adapted to direct cooling air into said intermediate cooling chamber, a fan associated with each suspension preheater and positioned and adapted to direct cooling air through said preheaters in controlled correlation with the air required in the calcining process, said preheater control combining with said stationary intermediate cooling chamber to provide effective and efficient heat exchange between the hot kiln product and the air passing through the system.
Dependencies are inferred from the claim text.