Dual-circulation absorption tower

Abstract

The invention discloses a dual-circulation wet absorption tower. The tower comprises a front absorption tower and a main absorption tower, wherein the main absorption tower comprises a first fume inlet and a first fume outlet; the front absorption tower comprises a second fume inlet and a second fume outlet; an inter-tower fume passage is formed between the second fume outlet and the first fume inlet; the main absorption tower and the front absorption tower are both provided with circulating pumps capable of pumping the grout from a grout tank; and an outlet pipe and a spraying layer of the circulating pump are connected with each other. The dual-circulation absorption tower of the invention can effectively improve the desulfurization efficiency and increase the operation stability, is environmentally-friendly and energy-saving and can reduce the using amount of a chemical additive.

Description

technical field [0001] The invention belongs to the technical field of environmental protection equipment, in particular to an absorption tower equipment capable of efficiently removing pollutants in coal-fired flue gas. Background technique [0002] The wet absorption tower is the SO in the coal-fired flue gas 2 Common equipment for the removal process. The wet absorption tower technology is mature and effective. At present, the single-loop wet absorption tower is mostly used in the technology. When removing SO 2 When the efficiency requirement is about 95%, the single-loop wet absorption tower has good economy and operation stability. [0003] Due to the sharp increase in fuel demand in China, many power plants are not allowed to burn high-sulfur coals. However, due to the increasing environmental protection requirements, power plants have to require higher desulfurization efficiency. When the desulfurization efficiency of the single-loop wet absorption tower exceeds 97...

AI Technical Summary

Problems solved by technology

[0006] Generally speaking, when the desulfurization efficiency increases from 95% to 99%, the number of circulating pumps will at least double. The power consumption of a single circulating pump in the desulfurization system is about 600-1200KW, and the power consumption of all circulating pumps accounts for about 40%-70% of the power consumption of the desulfurization system, therefore, increasing the number of circulating pumps will greatly increase the operating cost

When chemical additives are used, since the forced oxidation device is installed in the slurry tank, the chemical degradation rate of the chemical additives will be very fast, and the amount of chemical additives used is often large.

[0007] In addition, many countries have begun to restrict the emission of NOx in flue gas. Adding zinc, iron, and copper series metal chelates to the desulfurization absorption tower can reduce NOx emissions. x However, since the single-loop wet absorption tower absorbs SO2, it will also suck the easily absorbed HCL, HF and a large amount of dust into the slurry tank, causing more side reactions of metal chelates and high cost of use. Therefore, the current desulfurization tower removes NO x technology is not practical

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