Application method of fine desulfurization in sulfuric acid exhaust absorption

Abstract

The invention discloses an application method of fine desulfurization in sulfuric acid exhaust absorption, and relates to a technical scheme of the application of fine desulfurization in sulfuric acid exhaust absorption, in particular to a method for discharging SO2 exhaust. The method comprises the following steps of: A, introducing sulfur-containing exhaust into an absorption tower; and B, spraying ammonium sulfite-ammonium hydrogen sulfite solution serving as a fine desulfurization solution with the pH value of 5.6 to 6.1 from the top of the tower to absorb SO2 and SO3 in the sulfur-containing exhaust, and regulating the gas-liquid ratio to be (350-370): 1, wherein according to the concentration of aqueous ammonia in step B, the absorption mother solution refluxes to a mother solution circulating tank from the bottom of the absorption tower, and 10.3 to 10.6 mass percent of diluted aqueous ammonia is added, so that the ratio of (NH4)2SO3 to NH4HSO3 in the absorption solution is unchanged in an optimal range of the ammonium sulfite-ammonium hydrogen sulfite solution serving as the fine desulfurization solution; and the temperature of the mother solution in step B is between 25 and 30 DEG C. After the sulfur-containing exhaust is treated, the conversion rate of a sulfur acid device is more than or equal to 99.5 percent, and 60mg / Nm<3> of SO2 exhaust is discharged; and by substituting the expensive imported accelerant for the cheap domestic accelerant, the national emission standard can also be achieved, and the cost is reduced.

Description

technical field [0001] The invention relates to a technical scheme for the application of fine desulfurization in sulfuric acid tail suction, in particular to tail gas SO 2 method of emission. [0002] Background technique [0003] Defects of the existing technology: the conversion catalyst needs to rely on imported foreign catalysts; the cost is high; the tail gas SO 2 Emission reaches 500--600mg / Nm 3 , Exceeding the emission standard allowed by the state. [0004] At present, my country's environmental pollution is serious, and the trend of ecological damage has not been effectively controlled, and sulfur dioxide emissions will form acid rain. Energy conservation and emission reduction has become the most economical and effective measure to reduce environmental pollution and slow down global warming. With the strengthening of the country's control over emissions, starting from the company's own interests and social responsibilities, it is necessary to control sulfur d...

AI Technical Summary

Problems solved by technology

[0003] Defects of the existing technology: the conversion catalyst needs to rely on imported foreign catalysts; the cost is high; the exhaust SO2 emission reaches 500--600mg / Nm3, exceeding the emission standard allowed by the country

[0004]At present, my country's environmental pollution is serious, and the trend of ecological damage has not been effectively controlled, and sulfur dioxide emissions will form acid rain

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