Ammonia-ammonia sulfate dry type flue gas desulfurizing denitrifying equipment and technique

Abstract

Discloses is an ammonia- ammonia sulfate dry-type device for desulfuration and denitrification from smoke gas and the technique method, which is characterized in that: ammonia solution of a concentration of among 1- 10% in storage pot is prepared with liquid ammonia or high- concentration ammonia solution; sulfur dioxide in smoke gas reacts with the ammonia solution to generate ammonium sulfite; oxygen reacts with the ammonium sulfite to generate ammonia sulfate solution; ammonia escaping from the storage pot is recovered and sent to the recovery pot; the 1- 10% ammonia solution prepared is pumped to a desulfuration and denitrification absorption tower by an ammonia feeding pump and a conduct pipe; smoke gas is sent to the desulfuration and denitrification absorption tower by a smoke gas tube; the generated solid mixture of ammonia sulfate with ammonium nitrate goes to ammonia sulfate collector with smoke gas by the power of draught fan, at last is packed, and the smoke gas enters the ammonia-purified recovery tower.

Description

Technical field: [0001] The invention relates to the technical field of using ammonia to remove sulfur dioxide and nitrogen oxides in flue gas, and relates to an ammonia-ammonium sulfate dry flue gas desulfurization and denitrification equipment and a process method. Background technique: [0002] At present, the flue gas emitted by industrial boilers, power plant boilers and kilns contains a large amount of sulfur dioxide and nitrogen oxides. If no measures are taken to remove them and be directly discharged into the atmosphere, it will inevitably cause serious air pollution. [0003] In the existing technology, for the flue gas discharged from various boilers and kilns, the sulfur dioxide in the flue gas is removed by spray drying method: slaked lime is used as a desulfurizing agent to make a slurry, which is mixed with the sulfur dioxide in the flue gas after air atomization and spraying. The by-products of the reaction are calcium sulfite and calcium sulfate, which are d...

AI Technical Summary

Problems solved by technology

[0008] The prior art adopts the spray drying method for desulfurization. Since the slaked stone is less active and less alkaline than ammonia water, the desulfurization efficiency is low, only about 80%, and the by-products calcium sulfate and calcium sulfite produced during the desulfurization process have no recovery value. , can only be discarded, causing secondary pollution of waste residue

The existing technology adopts semi-dry ammonia method for desulfurization, and the by-product is unsaturated ammonium sulfite solution, which can only be discarded, resulting in waste and secondary pollution of wastewater

The above two methods do not remove nitrogen oxides in the flue gas, so they do not have the function of denitrification

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