Low-consumption high-quality ammonium sulfate fertilizer recovery wet ammonia process desulfurizing technology

Abstract

The invention relates to the desulfurization and denitrification process technology for air pollution control in the field of environmental protection, aiming at the problem that the existing ammonium-fertilizer method desulfurization technology recycles ammonium sulfate fertilizer with high production cost and the quality of the recovered ammonium sulfate product is low and the semi-dry ammonia method Desulfurization technology causes secondary pollution to the environment. The present invention proposes a wet ammonia desulfurization process for recycling high-quality ammonium sulfate fertilizers with low energy consumption. It uses ammonia water as a desulfurizer and generates flue gas after two-stage full desulfurization. Ammonium sulfite is subjected to two-stage oxidation outside the tower, so that ammonium sulfite can fully react to generate ammonium sulfate, and the generated ammonium sulfate solution is contacted with high-temperature flue gas to exchange heat, so as to cool down the flue gas while concentrating the ammonium sulfate solution. Thereby greatly saving the cost of making ammonium sulfate fertilizer products by evaporation and drying. Therefore, the technical solution of the present invention not only recycles fertilizer ammonium sulfate products with high quality, but also has low recycling cost. secondary pollution.

Description

Technical field: [0001] The invention relates to a desulfurization and denitrification process technology for air pollution control in the field of environmental protection, in particular to a wet ammonia desulfurization process for recycling high-quality ammonium sulfate fertilizer with low energy consumption. Background technique: [0002] Existing similar technology and existing deficiency are as follows: [0003] 1. Ammonia-fertilizer desulfurization technology [0004] Ammonia water is used as the desulfurizer, and the ammonium sulfate and ammonium sulfite solutions are combined with the SO in the flue gas under the acidic condition of the circulating liquid in the sieve plate desulfurization tower with a large circulation volume of PH<6. 2 Reaction, removal of SO 2 By-products ammonium sulfate and ammonium sulfite are produced, and ammonium sulfite is oxidized to ammonium sulfate by air aeration at the lower part of the desulfurization tower. After the ammonium su...

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Problems solved by technology

[0015] Aiming at the problems of the high production cost of ammonium sulfate reclaimed by the ammonia-fertilizer desulfurization technology in the prior art and the low quality of the recovered ammonium sulfate product and the problem of secondary pollution to the environment in the semi-dry ammonia method desulfurization technology, the present invention proposes A wet ammonia desulfurization process with low energy consumption and high-quality ammonium sulfate fertilizer recovery has been developed. The process design is reasonable, the desulfurization efficiency is high, and part of the nitrogen can be removed at the same time. The recovered ammonium sulfate is pure in quality and does not contain ammonium sulfite (NH 4 ) 2 SO 3 Composition, considerable economic value, to achieve "turning waste into treasure" of environmental protection, and this process technology does not have secondary pollution such as "waste gas, waste water, waste residue" while desulfurization

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