A flue gas dedusting and desulfurization tower and a flue gas desulfurization method

Abstract

The present invention discloses a flue gas dust removal desulfurization tower and a desulfurization method. The reactor of the present invention comprises a pre-treatment unit and a deep treatment unit, wherein the two units form an H-shaped double-tower structure, the pre-treatment unit comprises a flue gas inlet, a first-stage spraying system, a spindle-shaped regular packing assembly, a turbulent scrubber and a first-stage liquid holding tank from top to bottom, the deep treatment unit comprises a second-stage liquid holding tank, a packing assembly, a demister assembly and a purified flue gas outlet from bottom to top, and the pre-treatment unit and the deep treatment unit are communicated through the flue gas channel on the middle portion. According to the reactor of the present invention, the spindle-shaped regular packing assembly and the high level potential energy of the turbulent scrubber absorbing liquid can be utilized to concurrently pre-treat the flue gas, and the desulfurization tower has advantages of high contaminant removal rate, low energy consumption and the like, and is especially for the dust removal desulfurization process of high dust content flue gas.

Description

technical field [0001] The invention discloses a flue gas dust removal and desulfurization tower and a flue gas desulfurization method, which belong to the field of environmental protection, are suitable for dust removal and desulfurization treatment of flue gas and process tail gas, and can be widely used in petrochemical, environmental protection and other fields. Background technique [0002] Among the air pollution in China, acid rain and floating dust are the most important ones. For more than a decade, the problem of acid rain has become increasingly prominent due to increasing emissions of sulfur dioxide and nitrogen oxides. Now China is the third largest acid rain area after Europe and North America. SO 2 And dust is an important cause of air pollution in my country, and it is also an air pollutant that is currently under control in our country. my country SO 2 The total discharge has exceeded 20 million tons for many years in a row. In 2005, the total discharge ...

AI Technical Summary

Problems solved by technology

The technical effect achieved by this technology is primary desulfurization in the primary desulfurization scrubber and secondary desulfurization in the secondary desulfurization spray tower. The two-stage desulfurization units of this technology share a circulation pool, and there is no gradation area for the absorption liquid. The desulfurization rate It is not high, and the absorbent of this technology uses limestone slurry, and the return pipe between the two desulfurization units only relies on gravity to return, so the return line is easily blocked, and the long-term operation reliability of this technology is not enough

[0007] CN2608111Y discloses a high-concentration flue gas desulfurization and dust removal equipment. This technology connects more than two sets of desulfurization units in series, and covers the series desulfurization units together with a shell, and shares a circulation tank at the bottom. The circulation pool of this technology does not target To deal with the characteristics of high-concentration flue gas, only more than two sets of desulfurization units are connected in series, and the desulfurization efficiency can be guaranteed, but it occupies a large area and is not suitable for use in a small area reserved on the site.

[0008] In the prior art, although the cooling / dust removal / desulfurization of high-temperature flue gas adopts two-stage or multi-stage gas-liquid contact absorption process to achieve the effect of pollutant removal, each stage of spray absorption is equipped with corresponding liquid delivery equipment and absorption liquid atomization equipment, high energy consumption

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