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

Abstract

The invention discloses a technology for preparing ammonium sulfate by high-efficiency ammonia desulphurization and crystallization, belonging to the field of a flue gas desulfurization and dust removal technology. The technology comprises the working procedures of desulphurization, oxidization and concentration and comprises the steps of firstly, filling flue gas and ammonia water into a desulphurization section of a desulfurizing tower, and feeding slurry which is generated after reaction and desulphurization and contains ammonium hydrogen sulfite and ammonium sulfite into a regeneration storage tank; filling the ammonia water into the regeneration storage tank to have reaction with the ammonium hydrogen sulfite to generate ammonium sulfite, then feeding the ammonium sulfite solution into an oxidization section of the desulfurizing tower, and feeding slurry which is generated by oxidization reaction between the ammonium sulfite and the flue gas and contains ammonium sulfate into a concentration storage tank; conveying the ammonium sulfate solution from the concentration storage tank into a cooling section of the desulfurizing tower, and enabling the ammonium sulfate solution to come into contact with the flue gas to exchange heat; concentrating the ammonium sulfate solution and then feeding the concentrated ammonium sulfate solution in a crystallization storage tank; conveying the product into a separator, and carrying out solid-liquid separation. The technology utilizes the characteristic that the flue gas is high in oxygen content, so that the ammonium sulfite oxidization efficiency is high, the crystallization velocity of the ammonium sulfate is improved, the equipment input and the production energy consumption are effectively reduced, the potential safety hazard of production is reduced, and the economic benefit is remarkable.

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.