US 2015/0274590 A1

Cement production apparatus

(22) 09.08.2013

(43) 01.10.2015

(57) Providing a cement production apparatus in which raw material is supplied into a duct with being dispersed uniformly so that heat-exchanging efficiency is improved by even preheating and clogging and the like are prevented, so that stable operation can be carried out.

Between cyclones at an upper stage and a cyclone at a lower stage disposed below cyclones at an upper stage, a duct 21 is provided to introduce exhaust gas to the cyclones at the upper stage with distributing after flowing upward from the cyclone at the lower stage; at a lower position than a distribution part 23 of the duct 21, a material-supplying pipe 22 is connected for supplying cement raw material; at a connected part of the material-supplying pipe 22 to the duct 21, a material-guiding chute 24 on which the cement raw material is supplied from the material-supplying pipe 22 and which drops it into the duct 21 is provided with protruding into the duct 21; and the material-guiding chute 24 is formed to have a flat upper surface and to be expandable by sliding so that insertion depth of a tip end 24a from an inner-wall surface 24b of the duct 21 is 0.15 to 0.5 times of an inner diameter of the duct 21.

(71) Mitsubishi Materials Corporation, Chiyoda-ku, Tokyo (JP)

(73) Mitsubishi Materials Corporation, Chiyoda-ku, Tokyo (JP)

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