Patent ID: 6068826
Filing Date: 2000-05-30
Classification: B01D,C04B

Abstract:
A method for reducing the amount of chloride compounds produced in a kiln chamber for firing cement clinker bricks, said method comprising the steps of:a) removing at least a portion of chloride containing gases from the kiln chamber;b) feeding the removed gases to a condenser while maintaining the temperature of the removed gases at a value above condensation temperatures of the chloride compounds, wherein the condenser is connected to a heat exchanger;c) cooling the chloride-containing gases on cooling surfaces of the condenser, cooled by an intermediate heat absorbing medium, to a value below the condensation temperatures of the chloride compounds to form chloride crystals on the cooling surfaces of the condenser, passing the intermediate heat absorbing medium from the condenser to the heat exchanger and passing air as a primary heat-absorbing medium through the heat exchanger to indirectly absorb the heat from the intermediate heat absorbing medium;d) guiding the cleaned gases out of the condenser and guiding the air after heat absorption as secondary combustion air into the kiln chamber in the vicinity of a secondary fuel inlet;e) cleaning the cooling surfaces of the condenser from condensed chloride crystals and removing the cleaned-off chloride crystals from the condenser.