Abstract

The invention discloses a process and device for desulfurization-denitration of a flue gas. A desulfurization-denitration solution is used in an absorption tower to absorb sulfur dioxide and/or nitrogen oxides from the flue gas or various combustion tail (waste) gases. The desulfurization-denitration solution with absorbed sulfur dioxide and/or nitrogen oxides releases the sulfur dioxide and/or nitrogen oxides by heating and/or gas stripping and/or vacuum regeneration in a regeneration tower. The released sulfur dioxide and/or nitrogen oxides are further concentrated into a sulfur dioxide and/or nitrogen oxide product with a higher purity in a concentration tower. The regenerated desulfurization-denitration solution is recycled for use. The process and device have a wide range of industrial applications, and can be used for desulfurization and/or denitration of flue gases, incineration gases, coke-oven gases, synthetic waste gases from dyestuff plants, pollutant gases discharged from chemical fiber plants and other industrial raw material gases or waste gases containing SOx.

IPC Classes  ?

• B01D 53/56 - Nitrogen oxides
• B01D 53/60 - Simultaneously removing sulfur oxides and nitrogen oxides
• B01D 53/74 - General processes for purification of waste gasesApparatus or devices specially adapted therefor
• B01D 53/77 - Liquid phase processes
• B01D 53/78 - Liquid phase processes with gas-liquid contact
• B01D 53/96 - Regeneration, reactivation or recycling of reactants
• B01D 53/14 - Separation of gases or vapoursRecovering vapours of volatile solvents from gasesChemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases or aerosols by absorption
• B01D 53/18 - Absorbing unitsLiquid distributors therefor
• C01B 21/20 - Nitrogen oxidesOxyacids of nitrogenSalts thereof
• C01B 17/60 - Isolation of sulfur dioxide from gases