Desulfurization and denitration method for treating flue gas by using ion exchange fibers

Abstract

The invention provides a desulfurization and denitrification method for treating flue gas by using ion exchange fibers. The method comprises the following steps: (1) pretreatment; (2) primary oxidation; (3) secondary oxidation; (4) hydration reaction; and (5) ion exchange reaction so as to achieve the purpose of simultaneous desulfurization and denitrification. In the desulfurization and denitrification process of the ion exchange fiber treated flue gas, the ion exchange transformation and regeneration of the fiber can be simultaneously carried out without shutdown of the equipment, the convention of shutdown regeneration is broken, and one-time investment is saved; in the operation process of equipment, part of ion exchange fibers are regenerated in time, the utilization rate of the fibers is increased, and the use amount of the fibers is greatly reduced.

Description

technical field [0001] The disclosure relates to the field of desulfurization and denitrification, in particular to a method for treating flue gas desulfurization and denitrification with ion exchange fibers. Background technique [0002] Flue gas refers to the flue gas and dust produced by the combustion of industrial boilers. Among the pollutants contained in flue gas, sulfur dioxide (SO 2 ), nitrogen oxides (NOx) account for a large proportion. And sulfur dioxide (SO 2 ), nitrogen oxides (NOx) are one of the main pollutants causing air pollution, and effective control of sulfur dioxide and nitrogen oxides in flue gas is an urgent environmental protection issue. [0003] Strong base anion exchange fibers have strong base anion exchange groups (-CH 2 N-(CH 3 ) 3 Cl - ), has high affinity and adsorption performance for strongly acidic anions such as sulfate and nitrate, but for the molecular state SO in flue gas 2 and NOx have no adsorption effect. The SO in the flu...

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Problems solved by technology

However, those skilled in the art know that the solubility of SO2 is not high, which belongs to medium solubility, while the solubility of NO is very small, and it is impossible to achieve the effect of simultaneous desulfurization and denitrification completely by water dissolution or lye absorption; According to the reducing properties of both SO2 and NO, SO2 will be oxidized to SO3, SO3 is easily soluble in water to form H2SO4; while NO will be oxidized to NO2,N 2O3 and N2O5 and other high-valence nitrogen oxides, these high-valence nitrogen oxides The substance is very soluble in water to form HNO3

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