Process flow of comprehensive recovery of low-concentration SO2 flue gas from multiple gas sources

Abstract

The invention discloses a comprehensive multi-gas source low-concentration SO2 fume recycling acid-making technological process. The fume is mixed in a pressure adjusting gas distribution mode, is subjected to washing by using a high-efficiency washer and deep purification by using a combined purification tower, and is subsequently fed into a fume desulfurization system, and the tail gas is fed into a chimney to discharge out. The high-concentration SO2 which is produced from desulfuration and desorption is diluted by air or a part of pre-washed wet fume and is fed into an acid-making system, a finished product sulfuric acid is produced, the sulfuric acid tail gas is fed back to the combined purification tower and the fume desulfurization system, and the tail gas is discharged out when being subjected to up-to-standard desulfurization. The process is a comprehensive sulfur resource recycling technique that a multi-gas source mixed conveying technique, an SO2 recycling technique which employs an absorption-desorption method and a conversion-absorption acid-making technique are combined together, has the characteristics of high sulfur recycling rate, optimization in equipment and investment and low operation expense, can realize clean production and comprehensive recycling of SO2, prompts the development of circular economy of companies, and can be widely applied to comprehensive treatment on fume with low-concentration SO2 in industries of colored metal, steel and iron, thermal power, chemistry and the like.

Description

technical field [0001] The invention discloses a multi-gas source low-concentration SO 2 Flue gas comprehensive recovery acid production process, belongs to SO 2 Flue gas comprehensive recovery and utilization and acid production technology, especially involving multiple gas sources and low concentration SO 2 Process flow of comprehensive recovery of flue gas for acid production. Background technique [0002] Sto 2 Flue gas, with the country's recent years on SO 2 With the increasingly stringent emission standards, the low-concentration SO emitted by the above-mentioned various industrial furnaces 2 Pollution sources will gradually become an important factor affecting the development of enterprises. At present, in iron and steel, non-ferrous metals, thermal power and chemical enterprises, the low-concentration SO2 produced by various furnaces 2 Flue gas, because its concentration can neither meet the standard for direct efflux, nor can it meet the general flue gas acid...

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to recycle SO through multi-gas source mixed transportation and absorption-desorption method. 2 Combined with the one-turn-one-absorption acid production technology, it realizes low-concentration SO for multiple gas sources 2 The comprehensive recycling of flue gas avoids secondary pollution and realizes clean production

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