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

Abstract

The invention relates to a desulphurization and denitrogenation technology for controlling air pollution in environmental protection field. The invention is designed aiming at the problem of high production cost of reclaiming ammonium sulfate fertilizer and low quality of the reclaimed ammonium sulfate product by using the existing ammonia-fertilizer desulphurization technology, and the problem of that the half dry typed ammonia desulphurization technology can cause a secondary pollution to the environment. The invention provides a wet typed ammonia desulphurization technology of reclaiming ammonium sulfate fertilizer with low energy consumption and high quality. The invention adopts ammonia water as a desulfurizer. The ammonium sulfite, which is made after the gas is fully processed two-grade desulphurization, is processed two-grade oxidation outside the tower. The ammonium sulfite is fully reacted and formed ammonium sulfate, and the produced ammonium sulfate solution is contacted exchanged heat with high temperature gas, which reduces the gas temperature, and at the same time, the ammonium sulfate solution is condensed, and consequently, through which greatly saves the cost of evaporating, drying and making the ammonium sulfate fertilizer, and so the technical proposal of the invention not only can reclaim high quality ammonium sulfate product, but also has low reclaiming cost, and at the same time the purified gas can reach discharge standard without a secondary pollution like waste water etc.

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 under the acidic condition of the circulating liquid in the sieve plate type desulfurization tower with a large circulation volume of PH<6, the ammonium sulfate and ammonium sulfite solutions react with SO2 in the flue gas to remove SO2 and generate by-products ammonium sulfate and sulfite. Ammonium sulfate, ammonium sulfite is oxidized to ammonium sulfate by air aeration in the lower part of the desulfurization tower. After the ammonium sulfate solution ...

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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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