Flue gas simultaneous desulfurization and denitrogenation by utilizing triethylenediamine cobalt (III) and carbamide

Abstract

The invention relates to a method for synchronously de-sulfuration and de-nitrification with ethanediamine cobalt and carbamide wet method from smoke. The invention uses absorption solution to absorb the SO2 and NO of smoke, while the absorption solution is prepared by water-soluble inorganic cobalt salt, ethanediamine, carbamide, and sodium-hydroxide water solution, while the water-soluble inorganic cobalt salt can react with ethanediamine to generate ethanediamine cobalt. The invention uses ethanediamine cobalt as absorbent and catalysis oxidant of NO, while in the purpose for avoiding the Co2(SO3)3 reducing NO removing ratio, it adds carbamide and uses O2 as oxidant to transform the SO32- completely into SO42, to realize de-sulfuration and de-nitrification synchronously. The invention can make lowest concentration of SO3 and NO at outlet reach 0%, the oxidization ratio of SO32- reach 100%, and the ethanediamine cobalt can be regenerated easily, therefore, it only needs material one time. Since the cost of carbamide is lower, the total cost of chemical agents is lower without secondary pollution, which can apply the industry.

Description

technical field [0001] The invention relates to the technical field of flue gas purification and treatment, in particular to the desulfurization and denitrification of flue gas, in particular the simultaneous use of ethylenediamine cobalt and urea wet flue gas desulfurization and denitrification technology. Background technique [0002] Contains SO 2 and NO X A large amount of exhaust gas has caused serious environmental pollution problems, such as acid rain and the destruction of the ozone layer. Simultaneous flue gas desulfurization and denitrification technology is a hot technology that has only been researched and developed in the past ten years. Among them, NO X The removal of NO with a medium concentration of more than 95% is still a difficult point. At present, the existing technologies at home and abroad mainly include plasma method and a few catalytic methods. Due to relatively high equipment investment and operating costs, product reco...

AI Technical Summary

Problems solved by technology

Chinese patent applications with application numbers 03003768.7 and 01130154.6 disclose two methods for wet desulfurization and denitrification of urea additives. The mass percentage content of the absorbent urea used in the two methods is both 5-30%. The chemical dosage is large and the cost is high. , although its SO 2 The removal rate can reach more than 95%, but its NO X The removal rate is only 80%; the disadvantage of simultaneous desulfurization and denitrification of the ferrous complex system is that the regeneration of the ferrous complex is difficult and the cost is high; the Chinese patent applications with application numbers 01105004.7, 01105698.3, 02110646.0 and 200310108514.0 disclose cobalt ammonia solution and ethylenediamine cobalt solution to efficiently absorb nitrogen oxides in flue gas, the concentration of NO in the outlet gas can be as low as 0%, among which ethylenediamine cobalt is easy to regenerate, and has the most advantage

Among them, the p...