Process of calcining limestone in a rotary kiln

Details Process of calcining limestone in a rotary kiln Process of calcining limestone in a rotary kiln

B - Operations, Transporting

01

J

23/282

B01J 6/00 (2006.01) C01F 11/02 (2006.01) C04B 2/10 (2006.01)

Patent

CA 1107033

ABSTRACT OF THE DISCLOSURE: A process of calcining limestone or hydrated lime by a thermal treatment with hot gases in a rotary kiln in which the charge is moved countercurrently to the flow of the kiln atmosphere and oxygen-containing gases are introduced into the rotary kiln through the shell thereof at a plurality of points. The process of the invention is characterized in that at least part of the hot gases are produced by feeding solid carbonaceous fuel into the rotary kiln at the charging end thereof and injecting oxygen-containing gases through nozzle blocks into the charge which is disposed over nozzle blocks into that region of the rotary kiln which begins at the point where ignitable particles of the solid fuel first appear and terminates at a point which is spaced from the charging end by not more that 50% of the length of the kiln, the oxygen-containing gases being injected through shell pipes at least into the free space of the kiln of the afore- said region. The advantages afforded by the invention reside in that the length of the heating-up zone of the rotary kiln is greatly reduced and, as a result, either the throughput rate of a give kiln is increased or a smaller kiln may be used for a given throughput rate. In addition, the differ- ence between the gas temperature and the bed temperature is minimized and the exhaust gas temperature is minimum too. The lower heat content per unit of volume reduces the danger of a formation of crusts and increases the durability of the refractory lining. The total energy consumption is much reduced because the heat content of the volatile combustible constituents of the solid fuel is utilized to a large extent, the gas temperature in the free kiln space and consequently in the exhaust gases is reduced, and the direct gasification of carbon on the bed is decreased because the accumulation of heat which would otherwise be possible here is avoided.

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