Sintering flue gas ammonia method desulfurizing system

Abstract

The invention relates to an ammonia desulfurization system for sintering flue gas, and the system comprises a gasifying equipment, a absorbing equipment, an oxidation equipment, a concentration equipment and filter equipment etc. The ammonia desulfurization system for sintering flue gas of the invention can removes the SO2 in the flue gas effectively, but also can desulfurizate by reacting with SO2 in the flue gas using carbonization waste water (liquid ammonia gasified). The product of ammonium sulfite is oxidated in a low concentration at the common pressure, and then is concentrated by evaporation by the quantity of heat of the flue gas to greatly save the heat dissipation of concentration by evaporation to arrive at the aim of economize on energy. The ammonia sulfate solution in high concentration is filtrated, and then is send to the ammiaonia sulfate plant to produce chemical fertilizer. The flue gas desulfurization system of the invention has a reasonable process, makes the discharge of the flue gas reach the standard, forms without secondary pollution, treatment the waste gas by waste carbonization waste water, and produces the byproduct-chemical fertilizer.

Description

technical field [0001] The invention relates to flue gas desulfurization technology, in particular to an ammonia method desulfurization system for sintering flue gas. Background technique [0002] With the construction of cities and the improvement of people's living standards, energy consumption continues to increase. Because my country is mainly a large energy country with coal as its source material, the amount of sulfur dioxide discharged into the atmosphere has increased rapidly from 19.95 million tons in 2000 to 25.49 million tons in 2005. [0003] In the commonly used ammonia flue gas desulfurization at present: the oxidation of ammonium sulfite is usually carried out in the desulfurization tower, and the result of oxidation reduces the effective concentration of ammonia, which is not conducive to the removal of sulfur dioxide in the flue gas and the oxidation efficiency is low; In the prior art, steam is used to evaporate and concentrate ammonium sulfate, which requ...

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Problems solved by technology

[0003] In the commonly used ammonia flue gas desulfurization at present: the oxidation of ammonium sulfite is usually carried out in the desulfurization tower, and the result of oxidation reduces the effective concentration of ammonia, which is not conducive to the removal of sulfur dioxide in the flue gas and the oxidation efficiency is low; The existing technology uses steam to evaporate and concentrate ammonium sulfate, which requires a large amount of steam and high operating costs; there is still no effective solution to the problem of ammonia escape in the desulfurization tower

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