Wet flue gas desulphurization dedusting tower and wet flue gas desulphurization dedusting method

Abstract

The invention provides a wet flue gas desulphurization dedusting tower. The tower comprises a tower body, a spraying layer (1) and a demister layer (2) which is above the spaying layer. The tower is characterized in that: a bubbling system (3) special for wet flue gas desulphurization dedusting is arranged above the demister layer (2), wherein the bubbling system (3) special for wet flue gas desulphurization dedusting comprises several flue gas pipes (31) which are combined parallally, bubbling pipes (32) which are arranged between the flue gas pipes or on the pipe walls, and wetting liquid absorption and conveying subsystems (33); liquid steam bubble discharging apparatuses (321) are arranged on the bubbling pipes (32) and are used for discharging liquid steam bubbles to the flue gas pipes (31), and the lower ends or the upper ends of the bubbling pipes (32) are connected with the wetting liquid absorption and conveying subsystems (33). In the flue gas pipes (31), rising flue gas and dense steam bubbles are merged and blended, so that flue gas and steam bubbles are in full contact, a small amount of residual SO2 in the flue gas is absorbed, at the same time ultrafine particles in the flue gas are absorbed or wetted, so that the ultrafine particles either enter liquid, or agglomerate into droplets as a result of wetting, and separation becomes easier. The invention also relates to a wet flue gas desulphurization dedusting method by using the technology.

Description

technical field [0001] The invention relates to a desulfurization and dust removal equipment, in particular to a flue gas wet desulfurization and dust removal tower. The invention also relates to a flue gas wet desulfurization and dust removal method. technical background [0002] With the full development of global industrialization, environmental problems have become increasingly prominent, especially the use of a large amount of fossil fuels has led to increasingly serious air pollution problems, and acid rain and haze problems have endangered human existence. The sulfur dioxide and smoke emitted by coal-fired boilers are one of the most important sources of acid rain and haze. For this reason, the coal-fired boiler flue gas emission standards formulated by governments of various countries have made more and more stringent limits on the content of sulfur dioxide and soot. [0003] In recent years, my country's air pollution is also increasing. Since 2013, "smog" has be...

AI Technical Summary

Problems solved by technology

[0009] There are three main reasons why the existing conventional desulfurization and denitrification technologies are difficult to achieve near-zero emissions: First, there are still a small amount of SO 2 The flue gas is not fully absorbed at the spray layer; the second is that the mechanical demister does not completely remove zero; the third is that the wettability of PM10 and below, especially ultrafine particles such as PM2.5, is poor and cannot be removed by the mechanical demister

The existing bag filter is also powerless to PM2.5 ultrafine particles due to the bag mesh and pressure loss limitation

Existing electrostatic precipitators are difficult to remove because of the high specific resistance of PM2.5 ultrafine particles and difficulty in charging.

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