System and method for improving quality of ammonia desulphurization byproduct ammonium sulfate product

By using high-performance fluorine-containing materials to transform key components in the ammonia desulfurization process, and combining the impurity removal treatment of ion exchange columns and decontamination nets, the problems of unstable quality of by-product ammonium sulfate products and insufficient corrosion resistance of equipment are solved, and the product quality is significantly improved and the equipment life is extended.

CN119869171APending Publication Date: 2025-04-25CHINA SHENHUA COAL TO LIQUID & CHEM CO LTD +1
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Patent Information

Application Number
CN202510133731.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-02-06
Publication Date
2025-04-25

AI Technical Summary

Technical Problem

During the flue gas desulfurization process, the existing ammonia desulfurization process leads to unstable quality of by-product ammonium sulfate products, high impurity content, and insufficient corrosion resistance and high temperature resistance of the equipment lining material, resulting in a shortening of the equipment life.

Method used

High-performance fluorine-containing materials such as polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), and polyperfluoroethylene propylene (FEP) are used as the lining materials for desulfurization tower lining, spraying device and material conveying pipeline, and ion exchange columns and decontamination nets are installed in the oxidation circulation tank for decontamination treatment.

Benefits of technology

It significantly improves the quality of by-product ammonium sulfate products, reduces impurities content, extends the equipment life and ensures the stability of product quality.

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Abstract

The invention relates to the field of flue gas desulfurization, in particular to a system and a method for improving the quality of ammonium sulfate as a byproduct of ammonia desulfurization. The system comprises a desulfurization tower, a delivery pump, an oxidation circulation tank and a post-treatment device, two layers of sprayers are arranged in the desulfurization tower, and an ion exchange column is arranged in the oxidation circulation tank. The method comprises the following steps: (S1) reacting boiler flue gas with a lower spraying absorbent to obtain crude ammonium sulfite I and desulfurized flue gas; (S2) carrying out reaction on the desulfurized flue gas and the upwards sprayed circulating material to obtain crude ammonium sulfite II and purified flue gas; (S3) converting the crude ammonium sulfite I and the crude ammonium sulfite II into crude ammonium sulfate in an oxidation tank; (S4) in the presence of an absorbent and an oxidant, removing impurities from the crude ammonium sulfate in an oxidation circulation tank to obtain an ammonium sulfate solution; and (S5) taking part of the ammonium sulfate solution as a circulating material, and carrying out post-treatment on the rest to obtain an ammonium sulfate product. The carbon steel pipelines are adopted for conveying materials among the devices, and linings of the desulfurizing tower and the carbon steel pipelines are made of fluorine-containing materials, so that corrosion of the linings and the spraying devices can be reduced, and the quality of ammonium sulfate is improved.
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