Flue gas desulfurization method and system based on ammonia-magnesium combined reinforced phosphoric ore pulp method

Abstract

The invention discloses a flue gas desulfurization method and system based on an ammonia-magnesium combined reinforced phosphoric ore pulp method. The method comprises the following steps: S1, ammoniawater and magnesium oxide are added into phosphoric ore pulp to prepare mixed slurry; S2, flue gas containing SO2 and the sprayed mixed slurry are subjected to a contact reaction to remove SO2 in theflue gas; and S3, the flue gas is discharged after being washed by the slurry, oxygen is introduced into the reacted mixed slurry for reaction, then the mixed slurry is sent back to the step S2 to continue to wash the flue gas, and when the solubility of magnesium ammonium phosphate in the mixed slurry meets a preset requirement, the mixed slurry is sent to a crystallizer to produce magnesium ammonium phosphate crystals. According to the invention, the high desulfurization capacity of ammonia, magnesium and phosphoric ore pulp is utilized, and the advantages of sulfur dioxide absorption capacity of the ammonia, the magnesium and the phosphoric ore pulp and process optimization are combined, so as to promote the sulfuric acid leaching reaction of phosphate ore and enhance the desulfurization effect of the phosphoric ore pulp; and before burdening, organic acid is added when the mixture is ground to be fine, through the mechanochemical activation effect, the coordination complexation effect with calcium can be enhanced, crystal lattices are destroyed, and sulfur dioxide removal is accelerated.

Description

technical field [0001] The invention belongs to the technical field of flue gas desulfurization, and in particular relates to a method and system for flue gas desulfurization based on ammonia-magnesium combined enhanced phosphate rock slurry method. Background technique [0002] With the rapid development of my country's economy and the continuous acceleration of industrialization and urbanization, the demand for energy is becoming more and more serious. Coal is the main source of energy in my country, and its consumption accounts for about 80% of the total energy. While burning coal to provide energy, it also produces a large amount of smoke and SO 2 Such air pollutants seriously restrict the sustainable development of the world economy and human health. [0003] SO 2 As one of the main pollutants in the atmosphere, it seriously affects the health of the atmospheric environment. Control SO 2 Emissions come in many ways. Mainly divided into: before combustion, during c...

AI Technical Summary

Problems solved by technology

[0005] (1) Because ammonia is volatile, it will cause ammonia to overflow with desulfurization tail gas and lose raw materials

[0006] (2) Difficulty in oxidation of ammonium sulfite: NH 4+ Significantly hindered O 2 Dissolution in aqueous solution

[0007] (3) The solubility of ammonium sulfate changes little with temperature, and the method of crystallization and precipitation of ammonium sulfate is generally evaporative crystallization, which consumes extra steam

[0010] (1) Magnesium ore resources are mostly concentrated in a few provinces, and the source of raw materials and transportation costs restrict the promotion and application of this method;

[0011] (2) The regeneration method has high calcination temperature and high energy consumption. The effective use of by-products restricts the development of this method. It has high requirements for dust removal of flue gas, it is difficult to obtain better comprehensive economic benefits, and the cost is difficult to compete with large sulfuric acid enterprises.

However, the disadvantage of this method is that the slurry containing transition metal ions is required as an absorbent, and SO cannot be generated in all 2 Fume is widely used by businesses

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