Treatment technique for pollutants in sinter fume and spraying and absorbing tower thereof

Abstract

The invention discloses a treatment technique for pollutants in sinter fume and a spraying and absorbing tower thereof. After cooling and dedusting, the sinter fume is led into the spraying and absorbing tower, moves upwards to pass through at least two spraying and absorbing sections partitioned from up down in the spraying and absorbing tower, each spraying and absorbing section sprays and absorbs more than one pollutant in the sinter fume and the spraying and absorbing solution does not fall into the absorbing section of next layer, after passing through all the spraying and absorbing sections, the fume is demisted and exhausted from the top of the spraying and absorbing tower. The spraying and absorbing tower comprises a tower body, the tower body is partitioned into a demisting section, more than two spraying and absorbing sections and a fume inlet section from up down and a seriflux pool on the bottom of the tower body, and the adjacent spraying and absorbing sections are partitioned by a tower board assembly. The invention has the advantages that the loss of system resistance is small, the structure is simpler and more compact, the operation is convenient, the absorption effect is good, the treatment capacity is high and the like, and the invention can treat various pollutants in sinter fume.

Description

technical field [0001] The invention mainly relates to the fields of chemical industry and environmental protection, in particular to a method and equipment for treating pollutants in sintering flue gas. Background technique [0002] Sintering is one of the main processes in the steel production process. According to statistics, about 75% of the blast furnace charge in my country is provided by sintering machines. The annual output of sinter ore increased at a rate of 2016% between 2000 and 2006, and reached 416.9 billion tons in 2007. While the sintering industry is booming, iron ore sintering has also brought many problems to the environment, not only producing a lot of dust, but also emitting SO 2 , NOx, CO 2 , CO, HF, dioxin (PCDD), furan (PCDF) and many other harmful gaseous pollutants. Although my country's sintering plants have achieved remarkable results in flue gas dust control in recent years, the progress in the control of other harmful components in flue gas ha...

AI Technical Summary

Problems solved by technology

[0003] In addition, the problems that have not been solved so far in the ammonia desulfurization process adopted in the prior art are the escape loss of ammonia and the problem of aerosol

In the traditional ammonia desulfurization process, there are either multiple towers, or a pre-washing tower is added in front of the main absorption tower, and the pre-washing tower is used to reduce the temperature of the flue gas entering the tower and remove the dust in the flue gas, which increases equipment investment. Later, someone proposed a new transformation plan for this process, that is, to combine the pre-washing tower and the desulfurization tower into one, and divide the whole tower into three sections. Due to its own structure, the resistance loss of the equipment is very large, the process becomes complicated, the investment cost has not been significantly reduced, and the flue gas after desulfurization takes away a large amount of volatile matter and salt, the escape loss of ammonia is large, and the aerosol problem Not resolved, so that the system is unstable

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