Flue gas desulfurization technique using dual alkali method with white slime as recycling agent

Abstract

The invention discloses a double alkali flue gas desulfurization technology adopting white slime for regeneration; calcined soda and caustic soda or spent caustic and other alkali liquors are taken as absorbing agent and white slime is taken as regenerant for flue gas desulfurization, absorption liquid is sent into an absorber by a pump and is subject to contact reaction with the flue gas after dust removal and after defogging the desulfurated flue gas is discharged to a chimney; after reaction, the absorption liquid flows into a regeneration pool and reacts with added white slime slurry for regeneration, the regenerated absorption liquid is precipitated, and then supernatant fluid is sent to the absorber for recycling. The desulfurization efficiency of the invention can reach over 90%; by adopting white slime as regenerant, the technology of the invention not only can reduce running cost, but also can embody the development modes of using waste to treat waste, energy conservation and emission reduction, thus having significant environmental, economic and social benefits.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a double-alkali flue gas desulfurization process in which soda ash, caustic soda or spent caustic soda is used as an absorbent and white mud slurry is used as a regenerant in flue gas purification. Background technique [0002] Flue gas desulfurization (FGD) is the only large-scale commercial desulfurization technology in the world. As long as FGD technology uses absorbent or adsorbent to remove SO in flue gas 2 , and transform it into a more stable sulfur compound. There are many types of FGD technologies, but only a dozen are truly industrialized. FGD technology can be divided into wet method, dry method and semi-dry (semi-wet) method according to the dry and wet state of absorbent and desulfurized product in the desulfurization process. Among them, the wet flue gas desulfurization technology accounts for about 85% of the entire industrialized desulfurization e...

AI Technical Summary

Problems solved by technology

Since it cannot be properly treated, the white mud can only be piled up naturally, or directly discharged into the sea

Long-term stacking of white mud occupies a large amount of land resources, and its s

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