Technology for preparing desulfurizing agent ammonia water in sintering flue gas desulfurization by coking residual ammonia water

Abstract

The invention relates to a technology for preparing desulfurizing agent ammonia water in sintering flue gas desulfurization by coking residual ammonia water. The technology cokes the residual ammonia water with an ammonia vaporizing tower 8 and an ammonia dephlegmator 9 in a coking gas purifying system, i.e. 15-20% of ammonia water which is generated by condensing ammonia vapour is taken as source of the desulfurizing agent ammonia water in the sintering ammonia flue gas desulfurization, has the advantages of mature technology, stable operation, stability, small modification work load, less investment and less influence to coking production, provides stable ammonia source for the sintering ammonia flue gas desulfurization, reduces the process cost of waste ammonia and the running cost of sintering desulfurization during the coking production, recycles harmful substance ammonia in residual ammonia water, and accords with the national circular economy and the sustainable development strategy.

Description

technical field [0001] The invention relates to a technique for utilizing coking residual ammonia water in sintering ammonia flue gas desulfurization, and in particular to a process for preparing ammonia water desulfurization agent for sintering flue gas desulfurization by utilizing coking residual ammonia water. Background technique [0002] At present, sulfur dioxide in the iron and steel industry is mainly produced by sintering and pelletizing flue gas, which accounts for more than 70% of the total emissions of iron and steel enterprises, and some enterprises reach about 90%. According to statistics, in 2008, the national key iron and steel enterprises emitted about 1.1 million tons of sulfur dioxide, of which the emission of sintering sulfur dioxide was about 800,000 tons. [0003] According to the requirements of the "Implementation Plan for Sintering Flue Gas Desulfurization in the Iron and Steel Industry" officially released and implemented by the Ministry of Industry...

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Problems solved by technology

[0010] The purpose of this invention is to address the shortcomings of the existing coking waste ammonia used in sintering flue gas ammonia desulfurization technology, and propose a process for preparing ammonia water desulfurization agent in sintering flue gas desulfurization by using coking residual ammonia water

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