Novel flue gas desulfurization tower

Abstract

The invention discloses a novel flue gas desulfurization tower, which is used for solving the problem that the desulfurization tower in the prior art cannot fully utilize the heat in the flue gas, canprolong the retention time of bubbles in absorption liquid to improve the desulfurization effect of the flue gas and can control the thickness of a foam layer. The tower structurally comprises a shell, a flue gas treatment pipe, a spiral pipe and a defoaming mechanism. The flue gas treatment pipe is arranged on the bottom face of a heat insulation layer in the shell, flue gas is introduced into the flue gas treatment pipe, heat of the flue gas is exchanged with a cooling medium in the heat exchange layer, the heat of the flue gas is recycled and pressed into the spiral pipe wound outside theflue gas treatment pipe, absorption liquid is introduced into the spiral pipe, flue gas exhausted from the flue gas treatment pipe flows into the bottom of the shell along with absorption liquid in the spiral pipe, fog drops of the absorption liquid are further manufactured in the shell through an atomizing disc, the flue gas exhausted from the shell is purified again, the purification effect is improved, generated foam is controlled through the defoaming mechanism arranged in the shell, and excessive foam is avoided.

Description

technical field [0001] The invention belongs to the field of industrial tail gas treatment, and in particular relates to a novel flue gas desulfurization tower. Background technique [0002] Flue gas desulfurization refers to the removal of sulfur oxides (SO2 and SO3) from flue gas or other industrial waste gases. SO2 in flue gas is acidic in nature, and SO2 can be removed from flue gas by reacting with appropriate alkaline substances . The most commonly used alkaline substances for flue gas desulfurization are limestone (calcium carbonate, CaCO3), quicklime (calcium oxide, CaO) and slaked lime (calcium hydroxide, Ca(OH)2). Limestone is abundant and relatively cheap, and both quicklime and slaked lime are produced by heating limestone. Other alkaline substances such as sodium carbonate (soda ash), magnesium carbonate, and ammonia are sometimes used. The alkaline substance used reacts with the SO2 in the flue gas to produce a mixture of sulfites and sulfates (depending on ...

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Problems solved by technology

[0003] Limestone-gypsum is a commonly used method in the wet flue gas desulfurization process, but it is found that the slurry in the absorption tower of the prior art will foam during use, resulting in abnormal liquid level in the absorption tower. According to the Chinese journal "Chemical Design Communication" Issue 10 of Volume 46 in 2020 published "The Hazards, Causes and Defoaming Methods of Desulfurization Tower Slurry Foaming". overflow, because the flushing water of the demister suppresses and destroys the foam to a certain extent; on the other hand, in the wet flue gas desulfurization process, the residence time of flue gas in the absorption liquid is short, and the volume of gas bubbles is large, So it may not be able to fully respond

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