Importance

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Abstract

The present invention relates to a kiln plant and a method for manufacturing cement. The kiln plant comprises a kiln for burning clinker, a cooler, a calciner followed by a separation cyclone and a burning compartment which is fed tangentially with tertiary air from the cooler. Completely or partially calcined material is routed from the bottom of the burning compartment to the calciner to which exhaust gases from kiln are also vented. The object of the invention is to provide a kiln plant and a method for manufacturing cement. The kiln plant is of a relatively simplified construction and it may advantageously burn fuel with a low reactivity, such as petcoke, anthracite and other grades of coal with a low gas content in the calcining zone. This object is obtained by locating the tangential inlet of the burning compartment so that the height of the upper part of the inner volume of the burning compartment, h.sub.1 -h.sub.2, which is located below the burner tip and above the upper edge of the tangential inlet, is at least 1/3.multidot.D, where D is the diameter of that cylinder with the height h.sub.1 -h.sub.2 and the same volume as the upper volume of the burning compartment, and that the height of the lower part of the inner volume of the burning compartment, h.sub.3 -h.sub.4, being located between the lower edge of the tangential inlet and the outlet from the burning compartment, is at least D. Preferably, the height of the upper part of the inner volume of the burning compartment, h.sub.1 -h.sub.2, should be at least 2/3.multidot.D and the height of the lower part of the inner volume of the burning compartment, h.sub.3 -h.sub.4, should be at least D.

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First Claim