Process and plant for reducing harmful substances circuitry in the manufacture of cement clinker from raw flour

摘要

The method concerns reduction of the circulation of health damaging substances during manufacture of cement clinker from raw powders which are preheated in a series of flue gas heat exchangers, in particular, cyclone heat exchangers (11), and is burned into cement clinker in a sinter zone of the rotating pipe furnace (20). The powder (31) or dust (42) occurring during the process is introduced into the upper region of the entry chamber (19) of the rotating pipe furnace to act as condensation nuclei. These nuclei are seized by the extracted gas flow (35) which subsequently, by introduction of water (34) and/or cold air, is further cooled before dust separation in a dust separator (26). The installation is provided with a pipe line (31) for delivery of powders and/or dust into the entry chamber in a location close to the gas extraction opening. It is further provided with a mixing chamber (33) for added water and/or cooling air.