Technology for preparing ammonium sulfate by high-efficiency ammonia desulphurization and crystallization

Abstract

The invention discloses a process for preparing ammonium sulfate through high-efficiency ammonia desulfurization and crystallization, and belongs to the technical field of flue gas desulfurization and dust removal. The process includes desulfurization, oxidation, and concentration steps. First, the flue gas and ammonia water are passed into the desulfurization section of the desulfurization tower, and the slurry containing ammonium bisulfite and ammonium sulfite generated after the reaction desulfurization enters the regeneration storage tank; the ammonia water is passed into the regeneration tank. The storage tank reacts with ammonium bisulfite to generate ammonium sulfite, and then the ammonium sulfite solution is passed into the oxidation section of the desulfurization tower, and the slurry containing ammonium sulfate generated by reaction and oxidation with flue gas enters the concentrated storage tank; the sulfuric acid in the concentrated storage tank is The ammonium solution is passed into the cooling section of the desulfurization tower to contact the flue gas for heat exchange. After the ammonium sulfate solution is concentrated, it enters the crystallization storage tank and is transported to the separator for solid-liquid separation. The process of the present invention utilizes the characteristics of high oxygen content in the flue gas itself, has high efficiency in oxidizing ammonium sulfite, improves the crystallization speed of ammonium sulfate, and effectively reduces equipment investment and production energy consumption, reduces production safety hazards, and improves economic benefits. significantly.

Description

technical field [0001] The invention belongs to the technical field of flue gas desulfurization and dust removal, and in particular relates to a process for preparing ammonium sulfate by high-efficiency ammonia desulfurization and crystallization. Background technique [0002] Flue gas desulfurization and dust removal can effectively reduce pollution and clean the production environment. At present, there are mainly two types of flue gas desulfurization: dry method and wet method. Compared with gypsum desulfurization and double-alkali desulfurization, ammonia desulfurization in wet desulfurization technology is a A more environmentally friendly and efficient process, its main product - ammonium sulfate, as an important fertilizer product, has higher economic value than products obtained by other desulfurization methods, so ammonia desulfurization technology has gained more and more attention in the field of flue gas dedusting Wide range of applications. The process of prepa...

AI Technical Summary

Problems solved by technology

Due to the use of pressurized aeration method to oxidize ammonium sulfite, the current technology undoubtedly increases the operating cost, and the liquid level of the oxidation tank required by this method is too high, which is not conducive to safe production.