Integrated device for catalytic-cracking-flue-gas desulfurization, denitration, dust removing and acid mist removing and method

Abstract

The invention discloses an integrated device for catalytic-cracking-flue-gas desulfurization, denitration, dust removing and acid mist removing. The integrated device comprises an ozone generator anda desulfurization tower; a slant flue and a chimney are arranged on the desulfurization tower, and a rapid-cooling spraying pipe, an ozone distribution disc, an accident spraying pipe, a first riser cap, a plurality of empty tower spraying pipes, a second riser cap, an ammonia demister, a ridge demister and a mesh demister are sequentially arranged at the portion, between the slant flue and the chimney, in the desulfurization tower in the flue-gas flowing direction; the ozone generator is communicated with the ozone distribution disc through a pipe. The integrated device has the advantages that the desulphurization efficiency of flue gas can be effectively improved, generation of ammonia escaping, aerosol and acid mist can be effectively controlled, and meanwhile both Sox and NOx enter thefollow-up working procedure. Dust in the flue gas is removed through a flue gas-dust separating device, the desulfurization rate of the device is larger than or equal to 99%, the denitration rate islarger than or equal to 60%, the dust removing rate is larger than or equal to 80%, the removing rate of acid mist is larger than or equal to 90% when mist is removed with electricity, and the removing rate of the acid mist is larger than or equal to 60% when mist is removed with screen meshes.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to an integrated device and method for desulfurization, denitrification, dust removal, acid mist removal and acid mist removal of catalytic cracking flue gas. Background technique [0002] In recent years, a large amount of regenerator flue gas has become an important source of air pollution because it contains a large amount of SOx, NOx, particulate matter, acid mist and CO. It is estimated that SOx emissions from refineries account for about 6% to 7% of their total emissions, while SOx emissions from catalytic cracking account for about 5%. The pressure of the environmental situation has made the pressure of catalytic cracking pollutant emissions continue to increase. [0003] At present, the wet flue gas desulfurization processes of catalytic cracking units include the EDvD process of BELCO Company of the United States, the EP-Absorber process of GEA...

AI Technical Summary

Problems solved by technology

[0006] Existing catalytic cracking flue gas is mostly treated by foreign sodium method. A petrochemical catalytic cracking flue gas adopts the EDV+LoTOX process technology of BELCO company in the United States, and the dust concentration after treatment is 86-130mg / Nm 3 , nitrogen oxides 164-191mg / Nm 3 , sulfur dioxide at 20mg / Nm 3 Below, the concentration of smoke and dust cannot meet the requirements of emission standards, and the nitrogen oxides cannot meet the technical guarantee value indicators; the concentration of sulfuric acid mist at the outlet is 65-84mg / Nm 3 , within the concentration range where smoke plume is easy to form, does not meet the existing emission standards

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