Patent ID: 6524099
Filing Date: 2003-02-25
Classification: C04B

Abstract:
An apparatus for the thermal treatment of mealy raw materials, in particular in the manufacture of cement clinkers from raw meal, comprising:a cyclone suspension gas pre-heating system having a series of cyclones for thermally treating raw meal in a burning process by pre-heating the raw material; a calcinator having an ascending branch and a descending branch within which calcinating the preheated material in a gas-solid material suspension occurs; a rotary kiln for sintering the calcinated material connected to said calcinator; a rotary kiln exhaust gas line for receiving an exhaust gas stream from said rotary kiln; a clinker cooler for cooling the sintered material connected to said rotary kiln; a cooler outgoing air line for receiving an exhaust gas stream from said rotary kiln; said rotary kiln exhaust gas line being directed into a first portion of said ascending branch of said calcinator; said cooler outgoing air line being directed into a second portion of said ascending branch of said calcinator; a supply of fuel directed into said first portion at a first combustion point to burn sub-stoichiometrically to form CO strands; a supply of fuel directed into said second portion at a second combustion point to burn sub-stoichiometrically to form CO strands; at least one branch duct leading from said cooler outgoing air line upstream of said second combustion point and being directed into said ascending branch of said calcinator, downstream of said combustion points to provide additional combustion air for burning a remainder of the CO strands.