Cement making apparatus including preheater, kiln, cooler and auxiliary furnace
 An apparatus is disclosed for producing such as Portland cement from pulverant raw material having a preheater, an auxiliary furnace 22, a rotary kiln 2, a cooler, and a single blower connected to the top of the preheater to draw air and combustion gases through the kiln, auxiliary furnace and preheater. Preheater receives waste gas from the rotary kiln for flow through first, second, third and fourth level cyclones, with the first level cyclone(s) C.sub.1 being at an elevation higher than the kiln and the second, third and fourth level cyclones (C.sub.2, C.sub.3 and C.sub.4) each being at successively higher elevations. The auxiliary furnace 22 is preferably at the approximate level of the second level cyclone C.sub.2. The auxiliary furnace 22 is fed pulverant material from third level cyclone C.sub.3 and discharges pulverant material to a flue leading from the kiln to first level cyclones C.sub.1, with both such feed to and discharge from the auxiliary furnace proceeding under the influence of gravity without the need for a second blower to pressurize air from the cooler to the auxiliary furnace as has been necessary with arrangements of such systems known to the prior art before the present invention. 
Allis-Chalmers Corporation
C F F
C04B F27B F27B
inventional inventional inventional
Masaaki
Takeuchi