Grading oxidation and absorption type method for simultaneous desulphurization and denitration of sintering flue gas, and system

Abstract

The invention discloses a grading oxidation and absorption type method for simultaneous desulphurization and denitration of sintering flue gas, and a system. An oxidant solution is adopted in a first grade oxidation tower to spray and oxidize the sintering flue gas so that nitrogen oxides are oxidized into nitric oxide and sulfur dioxide is oxidized into sulfur trioxide. An absorbent solution is adopted in a second grade absorption tower to spray and absorb the sintering flue gas being sprayed and oxidized so that the nitric oxide and the sulfur trioxide are absorbed. Finally, the sintering flue gas after spray oxidation and spray absorption is discharged. The method and the system largely reduce the using amount of the oxidant at the same time of achieving the objectives of simultaneous desulphurization and denitration, and are efficient and energy-saving.

Description

technical field [0001] The invention relates to a method and system for simultaneous desulfurization and denitrification of sintering flue gas of a graded oxidation absorption type, which belongs to flue gas purification technology. Background technique [0002] Nitrogen oxides (NO x ) and sulfur dioxide (SO 2 ) is one of the main causes of acid rain. In some areas south of the Yangtze River in my country, the frequency of acid rain is as high as 90%, and the area of ​​acid rain is still expanding. Acid rain not only severely corrupts buildings and public facilities, but also destroys large areas of forests and crops, causing economic losses of more than 15 billion yuan to the country every year; nitrogen oxides have a strong affinity with hemoglobin in the blood, and are easily inhaled into the lungs. In addition, nitrogen oxides are one of the important causes of photochemical pollution, so the problem of nitrogen oxide pollution has attracted the attention of the whole ...

AI Technical Summary

Problems solved by technology

At present, the denitrification technologies commonly used in coal-fired power plants are SCR or SNCR. Both methods need to be carried out at high operating temperatures (300-1000°C), and require new large-scale equipment, requiring a lot of initial investment and operation. Cost, the current problem brought about by oxidation and denitrification is the high cost of oxidant, for low temperature and low NO x Concentrated sintering flue gas currently has no mature technical solutions

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