A flue gas purification system for ammonia desulfurization and denitrification

Abstract

The invention relates to an ammonia desulfurization and denitration type flue gas purification system, belongs to the technical field of flue gas treatment and environment equipment. More specifically, the system takes ammonia as an absorbent for absorbing SO2 and NOx in flue gas from an absorption tower; oxygen is introduced for oxidizing, wherein ammonium sulfite is oxidized into ammonium sulfate; the NOx which is difficult to oxidize in a liquid phase reacts with the oxygen in a gas phase through analysis; a reaction product is also absorbed by the ammonia and is returned to the absorption tower, so that a mixed product of the ammonium sulfate and ammonium nitrate is prepared. The ammonia desulfurization and denitration type flue gas purification system has the beneficial effects that the aims of removing dust, performing desulfurization and denitration, and recycling the NOx are fulfilled; the system investment is low; the operation is stable and reliable; the resource and energy consumption is low; the NOx recovery rate is high; by-produces such as sulfur-containing and nitrate-containing products are obtained; the product value is high; the implementation effect is good; the desulfurization rate is greater than or equal to 98 percent; the denitration rate is greater than or equal to 85 percent; the NOx recovery rate is greater than or equal to 85 percent.

Description

technical field [0001] The present application belongs to the technical field of flue gas treatment and environmental equipment. The invention relates to an ammonia desulfurization and denitrification flue gas purification system, more specifically, a flue gas purification system that uses ammonia as an absorbent and absorbs SO in flue gas in an absorption tower 2 and NOx, and then oxygen is introduced for oxidation, and ammonium sulfite is oxidized to ammonium sulfate; and NOx, which is difficult to oxidize in the liquid phase, reacts with oxygen in the gas phase through analysis, and the reaction product is still absorbed by ammonia and returned to the absorption tower, thereby A system for producing a mixed product of ammonium sulfate and ammonium nitrate. Background technique [0002] At present, flue gas desulfurization and denitrification mainly use "wet flue gas desulfurization (Wet-FGD) and NH 3 Selective Catalytic Reduction (SCR) technology for denitrification”, t...

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Problems solved by technology

[0005] Aiming at the shortcomings of Wet-FGD+SCR combined desulfurization and denitrification, which require large investment, high operating costs, high value ammonia consumption, and low value of by-products, this application proposes an ammonia-based desulfurization and denitrification flue gas purification system. The system design is reasonable, To achieve the purpose of dust removal, simultaneous desulfurization and denitrification and recovery of NOx, the system has low investment, stable and reliable operation, low resource and energy consumption, and high value of by-products

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