Purification method for cement kiln by-pass circulating flue gas

A bypass ventilation and flue gas purification technology, which is applied in the field of flue gas purification, can solve the problems of environmental secondary pollution, environmental pollution, and failure to be properly treated, so as to reduce interference, reduce recurrence, and reduce the probability of recombination Effect

Inactive Publication Date: 2019-02-15
合肥中亚环保科技有限公司
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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

Method used

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  • Purification method for cement kiln by-pass circulating flue gas

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Embodiment Construction

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0024] See figure 1 , a cement kiln bypass ventilation flue gas purification system, including a sequentially connected primary cooler 1, high temperature bag filter 2, secondary cooler 3, selective catalytic reduction (SCR) reactor 4, quenching Tower 5, bag filter 6, external exhaust fan 7 and chimney 8; among them, primary cooler 1 and secondary cooler 2 are all selected air-cooled coolers, and the air-cooled coolers are connected with external fan 9, and th...

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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...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D46/02B01D53/86B01D53/56B01D53/44B01D53/68B01D53/83
CPCB01D46/02B01D53/685B01D53/8631B01D53/8687B01D2251/2062B01D2251/304B01D2257/704B01D2258/0283Y02A50/2351
Inventor 施勇穆璐莹毛志伟甘昊廖玉云郭新干陶巍朱孝峰沈龙
Owner 合肥中亚环保科技有限公司
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