Method and device for preparing ammonia through active molecule oxidation flue gas double-circulation denitration

Abstract

The invention provides a method and device for preparing ammonia through active molecule oxidation flue gas double-circulation denitration, and relates to the field of flue gas treatment denitration wastewater treatment and flue gas denitration. The method comprises the following steps: flue gas containing nitrogen oxides sequentially enters a flue reactor and a wet washing absorption tower, O3 molecules from an active molecule generator oxidize the flue gas, and the nitrogen oxides are absorbed into a nitrate solution through wet alkali washing; the absorbed nitrate-containing alkali wash liquor generates ammonia through an ammonia production electrolytic bath, the ammonia is removed through an ammonia outlet tower, and the alkali liquor is regenerated after being diluted by make-up water and enters a wet washing absorption tower to be recycled. According to the invention, the emission of the active molecule oxidation flue gas denitration wastewater is reduced, the flue gas pollutant NOx is converted into NH3, the resource recycling of the pollutant is realized, the alkali liquor and oxygen in the system are recycled, the consumption of the alkali liquor and oxygen is reduced, and meanwhile, the energy consumption is reduced. The denitration efficiency is 95% or above, the NH3 conversion rate reaches 80% or above, and the method has great environmental and economic benefits.

Description

technical field [0001] The invention relates to the field of flue gas denitration wastewater treatment and flue gas denitration, in particular to a method and a device for producing ammonia by active molecular oxidation of flue gas double-cycle denitration. Background technique [0002] The combustion of solid waste, waste liquid, and exhaust gas in chemical production produces a large amount of air pollutants, including nitrogen oxides. [0003] At present, the main application technologies for flue gas denitrification are SNCR (selective non-catalytic reduction) and SCR (selective catalytic reduction) technologies. SNCR is suitable for the flue gas temperature of 850~1150 ℃. Directly inject reducing agent into the flue gas to reduce nitrogen oxides to N through thermochemical reaction. 2 It can be carried out without catalyst, and the investment and operation costs are low, but the denitration efficiency is low. With the increasingly strict emission standards, SNCR alone ...

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problems of difficult treatment of active molecular oxidation and denitrification wastewater and high denitrification operation costs and low returns, the present invention provides a method and device for electrolytic ammonia production by active molecular oxidation of flue gas denitrification wastewater, which can convert nitrogen oxides in flue gas for high value NH 3 , while reducing waste water discharge, reducing absorbent and oxygen consumption, and reducing system energy consumption

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