Purification method for cement kiln by-pass circulating flue gas

Abstract

The invention discloses a purification method for cement kiln by-pass circulating flue gas. Flue gas is sequentially subjected to primary cooling, high temperature dust removal, secondary cooling, catalytic reduction to enable oxynitride and dioxin to be decomposed, quenching cooling and deacidification through a dry method, and finally subjected to final dust removal through a bag filter, and then is discharged. The method has the advantages that chloride ions and dust are subjected to collection treatment at different temperature, the difficulty of retreatment on collected waste is greatly reduced, and denitration equipment and dioxin removal reaction equipment are provided, so that indexes of all gas pollutants in treated flue gas meet the requirements on ultra-clean emission.

Description

technical field [0001] The invention relates to the field of flue gas purification, in particular to a method for purifying flue gas from a cement kiln bypass. Background technique [0002] The coordinated incineration of domestic waste and medical waste in cement kilns requires the addition of a bypass ventilation system to reduce the impact of crust blockage on the cement kiln firing system due to excessive concentration of chloride ions. The flue gas released by the bypass contains a large amount of dust, HCl, NOx, dioxins, heavy metals and other harmful substances, which will cause serious pollution to the environment. At present, the exhaust purification system for this part of the flue gas is to cool the flue gas and then discharge it into the bag filter, but the large amount of pollutants in the flue gas has not been effectively controlled. The dust collected by the bag filter contains a large amount of chloride ions, dioxins and other harmful substances. These subst...

AI Technical Summary

Problems solved by technology

The flue gas released by the bypass contains a large amount of dust, HCl, NOx, dioxins, heavy metals and other harmful substances, which will cause serious pollution to the environment

At present, the exhaust purification system for this part of the flue gas is to cool the flue gas and then discharge it into the bag filter, but the large amount of pollutants in the flue gas has not been effectively controlled

The dust collected by the bag filter contains a large amount of chloride ions, dioxins and other harmful substances, and these substances have not been properly treated, which is likely to cause secondary pollution to the environment

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